mm: drop unneeded pgdat argument from free_area_init_node()
[linux-2.6.git] / arch / sparc / mm / sun4c.c
1 /* sun4c.c: Doing in software what should be done in hardware.
2  *
3  * Copyright (C) 1996 David S. Miller (davem@davemloft.net)
4  * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
5  * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au)
6  * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org)
7  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
8  */
9
10 #define NR_TASK_BUCKETS 512
11
12 #include <linux/kernel.h>
13 #include <linux/mm.h>
14 #include <linux/init.h>
15 #include <linux/bootmem.h>
16 #include <linux/highmem.h>
17 #include <linux/fs.h>
18 #include <linux/seq_file.h>
19 #include <linux/scatterlist.h>
20
21 #include <asm/page.h>
22 #include <asm/pgalloc.h>
23 #include <asm/pgtable.h>
24 #include <asm/vaddrs.h>
25 #include <asm/idprom.h>
26 #include <asm/machines.h>
27 #include <asm/memreg.h>
28 #include <asm/processor.h>
29 #include <asm/auxio.h>
30 #include <asm/io.h>
31 #include <asm/oplib.h>
32 #include <asm/openprom.h>
33 #include <asm/mmu_context.h>
34 #include <asm/sun4paddr.h>
35 #include <asm/highmem.h>
36 #include <asm/btfixup.h>
37 #include <asm/cacheflush.h>
38 #include <asm/tlbflush.h>
39
40 /* Because of our dynamic kernel TLB miss strategy, and how
41  * our DVMA mapping allocation works, you _MUST_:
42  *
43  * 1) Disable interrupts _and_ not touch any dynamic kernel
44  *    memory while messing with kernel MMU state.  By
45  *    dynamic memory I mean any object which is not in
46  *    the kernel image itself or a thread_union (both of
47  *    which are locked into the MMU).
48  * 2) Disable interrupts while messing with user MMU state.
49  */
50
51 extern int num_segmaps, num_contexts;
52
53 extern unsigned long page_kernel;
54
55 #ifdef CONFIG_SUN4
56 #define SUN4C_VAC_SIZE sun4c_vacinfo.num_bytes
57 #else
58 /* That's it, we prom_halt() on sun4c if the cache size is something other than 65536.
59  * So let's save some cycles and just use that everywhere except for that bootup
60  * sanity check.
61  */
62 #define SUN4C_VAC_SIZE 65536
63 #endif
64
65 #define SUN4C_KERNEL_BUCKETS 32
66
67 /* Flushing the cache. */
68 struct sun4c_vac_props sun4c_vacinfo;
69 unsigned long sun4c_kernel_faults;
70
71 /* Invalidate every sun4c cache line tag. */
72 static void __init sun4c_flush_all(void)
73 {
74         unsigned long begin, end;
75
76         if (sun4c_vacinfo.on)
77                 panic("SUN4C: AIEEE, trying to invalidate vac while it is on.");
78
79         /* Clear 'valid' bit in all cache line tags */
80         begin = AC_CACHETAGS;
81         end = (AC_CACHETAGS + SUN4C_VAC_SIZE);
82         while (begin < end) {
83                 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
84                                      "r" (begin), "i" (ASI_CONTROL));
85                 begin += sun4c_vacinfo.linesize;
86         }
87 }
88
89 static void sun4c_flush_context_hw(void)
90 {
91         unsigned long end = SUN4C_VAC_SIZE;
92
93         __asm__ __volatile__(
94                 "1:     addcc   %0, -4096, %0\n\t"
95                 "       bne     1b\n\t"
96                 "        sta    %%g0, [%0] %2"
97         : "=&r" (end)
98         : "0" (end), "i" (ASI_HWFLUSHCONTEXT)
99         : "cc");
100 }
101
102 /* Must be called minimally with IRQs disabled. */
103 static void sun4c_flush_segment_hw(unsigned long addr)
104 {
105         if (sun4c_get_segmap(addr) != invalid_segment) {
106                 unsigned long vac_size = SUN4C_VAC_SIZE;
107
108                 __asm__ __volatile__(
109                         "1:     addcc   %0, -4096, %0\n\t"
110                         "       bne     1b\n\t"
111                         "        sta    %%g0, [%2 + %0] %3"
112                         : "=&r" (vac_size)
113                         : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG)
114                         : "cc");
115         }
116 }
117
118 /* File local boot time fixups. */
119 BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long)
120 BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long)
121 BTFIXUPDEF_CALL(void, sun4c_flush_context, void)
122
123 #define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr)
124 #define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr)
125 #define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)()
126
127 /* Must be called minimally with interrupts disabled. */
128 static void sun4c_flush_page_hw(unsigned long addr)
129 {
130         addr &= PAGE_MASK;
131         if ((int)sun4c_get_pte(addr) < 0)
132                 __asm__ __volatile__("sta %%g0, [%0] %1"
133                                      : : "r" (addr), "i" (ASI_HWFLUSHPAGE));
134 }
135
136 /* Don't inline the software version as it eats too many cache lines if expanded. */
137 static void sun4c_flush_context_sw(void)
138 {
139         unsigned long nbytes = SUN4C_VAC_SIZE;
140         unsigned long lsize = sun4c_vacinfo.linesize;
141
142         __asm__ __volatile__(
143         "add    %2, %2, %%g1\n\t"
144         "add    %2, %%g1, %%g2\n\t"
145         "add    %2, %%g2, %%g3\n\t"
146         "add    %2, %%g3, %%g4\n\t"
147         "add    %2, %%g4, %%g5\n\t"
148         "add    %2, %%g5, %%o4\n\t"
149         "add    %2, %%o4, %%o5\n"
150         "1:\n\t"
151         "subcc  %0, %%o5, %0\n\t"
152         "sta    %%g0, [%0] %3\n\t"
153         "sta    %%g0, [%0 + %2] %3\n\t"
154         "sta    %%g0, [%0 + %%g1] %3\n\t"
155         "sta    %%g0, [%0 + %%g2] %3\n\t"
156         "sta    %%g0, [%0 + %%g3] %3\n\t"
157         "sta    %%g0, [%0 + %%g4] %3\n\t"
158         "sta    %%g0, [%0 + %%g5] %3\n\t"
159         "bg     1b\n\t"
160         " sta   %%g0, [%1 + %%o4] %3\n"
161         : "=&r" (nbytes)
162         : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX)
163         : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
164 }
165
166 /* Don't inline the software version as it eats too many cache lines if expanded. */
167 static void sun4c_flush_segment_sw(unsigned long addr)
168 {
169         if (sun4c_get_segmap(addr) != invalid_segment) {
170                 unsigned long nbytes = SUN4C_VAC_SIZE;
171                 unsigned long lsize = sun4c_vacinfo.linesize;
172
173                 __asm__ __volatile__(
174                 "add    %2, %2, %%g1\n\t"
175                 "add    %2, %%g1, %%g2\n\t"
176                 "add    %2, %%g2, %%g3\n\t"
177                 "add    %2, %%g3, %%g4\n\t"
178                 "add    %2, %%g4, %%g5\n\t"
179                 "add    %2, %%g5, %%o4\n\t"
180                 "add    %2, %%o4, %%o5\n"
181                 "1:\n\t"
182                 "subcc  %1, %%o5, %1\n\t"
183                 "sta    %%g0, [%0] %6\n\t"
184                 "sta    %%g0, [%0 + %2] %6\n\t"
185                 "sta    %%g0, [%0 + %%g1] %6\n\t"
186                 "sta    %%g0, [%0 + %%g2] %6\n\t"
187                 "sta    %%g0, [%0 + %%g3] %6\n\t"
188                 "sta    %%g0, [%0 + %%g4] %6\n\t"
189                 "sta    %%g0, [%0 + %%g5] %6\n\t"
190                 "sta    %%g0, [%0 + %%o4] %6\n\t"
191                 "bg     1b\n\t"
192                 " add   %0, %%o5, %0\n"
193                 : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize)
194                 : "0" (addr), "1" (nbytes), "2" (lsize),
195                   "i" (ASI_FLUSHSEG)
196                 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
197         }
198 }
199
200 /* Don't inline the software version as it eats too many cache lines if expanded. */
201 static void sun4c_flush_page_sw(unsigned long addr)
202 {
203         addr &= PAGE_MASK;
204         if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) ==
205             _SUN4C_PAGE_VALID) {
206                 unsigned long left = PAGE_SIZE;
207                 unsigned long lsize = sun4c_vacinfo.linesize;
208
209                 __asm__ __volatile__(
210                 "add    %2, %2, %%g1\n\t"
211                 "add    %2, %%g1, %%g2\n\t"
212                 "add    %2, %%g2, %%g3\n\t"
213                 "add    %2, %%g3, %%g4\n\t"
214                 "add    %2, %%g4, %%g5\n\t"
215                 "add    %2, %%g5, %%o4\n\t"
216                 "add    %2, %%o4, %%o5\n"
217                 "1:\n\t"
218                 "subcc  %1, %%o5, %1\n\t"
219                 "sta    %%g0, [%0] %6\n\t"
220                 "sta    %%g0, [%0 + %2] %6\n\t"
221                 "sta    %%g0, [%0 + %%g1] %6\n\t"
222                 "sta    %%g0, [%0 + %%g2] %6\n\t"
223                 "sta    %%g0, [%0 + %%g3] %6\n\t"
224                 "sta    %%g0, [%0 + %%g4] %6\n\t"
225                 "sta    %%g0, [%0 + %%g5] %6\n\t"
226                 "sta    %%g0, [%0 + %%o4] %6\n\t"
227                 "bg     1b\n\t"
228                 " add   %0, %%o5, %0\n"
229                 : "=&r" (addr), "=&r" (left), "=&r" (lsize)
230                 : "0" (addr), "1" (left), "2" (lsize),
231                   "i" (ASI_FLUSHPG)
232                 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
233         }
234 }
235
236 /* The sun4c's do have an on chip store buffer.  And the way you
237  * clear them out isn't so obvious.  The only way I can think of
238  * to accomplish this is to read the current context register,
239  * store the same value there, then read an external hardware
240  * register.
241  */
242 void sun4c_complete_all_stores(void)
243 {
244         volatile int _unused;
245
246         _unused = sun4c_get_context();
247         sun4c_set_context(_unused);
248 #ifdef CONFIG_SUN_AUXIO
249         _unused = get_auxio();
250 #endif
251 }
252
253 /* Bootup utility functions. */
254 static inline void sun4c_init_clean_segmap(unsigned char pseg)
255 {
256         unsigned long vaddr;
257
258         sun4c_put_segmap(0, pseg);
259         for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE)
260                 sun4c_put_pte(vaddr, 0);
261         sun4c_put_segmap(0, invalid_segment);
262 }
263
264 static inline void sun4c_init_clean_mmu(unsigned long kernel_end)
265 {
266         unsigned long vaddr;
267         unsigned char savectx, ctx;
268
269         savectx = sun4c_get_context();
270         for (ctx = 0; ctx < num_contexts; ctx++) {
271                 sun4c_set_context(ctx);
272                 for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE)
273                         sun4c_put_segmap(vaddr, invalid_segment);
274                 for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE)
275                         sun4c_put_segmap(vaddr, invalid_segment);
276                 for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE)
277                         sun4c_put_segmap(vaddr, invalid_segment);
278                 for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE)
279                         sun4c_put_segmap(vaddr, invalid_segment);
280         }
281         sun4c_set_context(savectx);
282 }
283
284 void __init sun4c_probe_vac(void)
285 {
286         sun4c_disable_vac();
287
288         if (ARCH_SUN4) {
289                 switch (idprom->id_machtype) {
290
291                 case (SM_SUN4|SM_4_110):
292                         sun4c_vacinfo.type = VAC_NONE;
293                         sun4c_vacinfo.num_bytes = 0;
294                         sun4c_vacinfo.linesize = 0;
295                         sun4c_vacinfo.do_hwflushes = 0;
296                         prom_printf("No VAC. Get some bucks and buy a real computer.");
297                         prom_halt();
298                         break;
299
300                 case (SM_SUN4|SM_4_260):
301                         sun4c_vacinfo.type = VAC_WRITE_BACK;
302                         sun4c_vacinfo.num_bytes = 128 * 1024;
303                         sun4c_vacinfo.linesize = 16;
304                         sun4c_vacinfo.do_hwflushes = 0;
305                         break;
306
307                 case (SM_SUN4|SM_4_330):
308                         sun4c_vacinfo.type = VAC_WRITE_THROUGH;
309                         sun4c_vacinfo.num_bytes = 128 * 1024;
310                         sun4c_vacinfo.linesize = 16;
311                         sun4c_vacinfo.do_hwflushes = 0;
312                         break;
313
314                 case (SM_SUN4|SM_4_470):
315                         sun4c_vacinfo.type = VAC_WRITE_BACK;
316                         sun4c_vacinfo.num_bytes = 128 * 1024;
317                         sun4c_vacinfo.linesize = 32;
318                         sun4c_vacinfo.do_hwflushes = 0;
319                         break;
320
321                 default:
322                         prom_printf("Cannot initialize VAC - weird sun4 model idprom->id_machtype = %d", idprom->id_machtype);
323                         prom_halt();
324                 };
325         } else {
326                 sun4c_vacinfo.type = VAC_WRITE_THROUGH;
327
328                 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
329                     (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
330                         /* PROM on SS1 lacks this info, to be super safe we
331                          * hard code it here since this arch is cast in stone.
332                          */
333                         sun4c_vacinfo.num_bytes = 65536;
334                         sun4c_vacinfo.linesize = 16;
335                 } else {
336                         sun4c_vacinfo.num_bytes =
337                          prom_getintdefault(prom_root_node, "vac-size", 65536);
338                         sun4c_vacinfo.linesize =
339                          prom_getintdefault(prom_root_node, "vac-linesize", 16);
340                 }
341                 sun4c_vacinfo.do_hwflushes =
342                  prom_getintdefault(prom_root_node, "vac-hwflush", 0);
343
344                 if (sun4c_vacinfo.do_hwflushes == 0)
345                         sun4c_vacinfo.do_hwflushes =
346                          prom_getintdefault(prom_root_node, "vac_hwflush", 0);
347
348                 if (sun4c_vacinfo.num_bytes != 65536) {
349                         prom_printf("WEIRD Sun4C VAC cache size, "
350                                     "tell sparclinux@vger.kernel.org");
351                         prom_halt();
352                 }
353         }
354
355         sun4c_vacinfo.num_lines =
356                 (sun4c_vacinfo.num_bytes / sun4c_vacinfo.linesize);
357         switch (sun4c_vacinfo.linesize) {
358         case 16:
359                 sun4c_vacinfo.log2lsize = 4;
360                 break;
361         case 32:
362                 sun4c_vacinfo.log2lsize = 5;
363                 break;
364         default:
365                 prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n",
366                             sun4c_vacinfo.linesize);
367                 prom_halt();
368         };
369
370         sun4c_flush_all();
371         sun4c_enable_vac();
372 }
373
374 /* Patch instructions for the low level kernel fault handler. */
375 extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff;
376 extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff;
377 extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff;
378 extern unsigned long num_context_patch1, num_context_patch1_16;
379 extern unsigned long num_context_patch2_16;
380 extern unsigned long vac_linesize_patch, vac_linesize_patch_32;
381 extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on;
382 extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on;
383
384 #define PATCH_INSN(src, dst) do {       \
385                 daddr = &(dst);         \
386                 iaddr = &(src);         \
387                 *daddr = *iaddr;        \
388         } while (0)
389
390 static void __init patch_kernel_fault_handler(void)
391 {
392         unsigned long *iaddr, *daddr;
393
394         switch (num_segmaps) {
395                 case 128:
396                         /* Default, nothing to do. */
397                         break;
398                 case 256:
399                         PATCH_INSN(invalid_segment_patch1_ff,
400                                    invalid_segment_patch1);
401                         PATCH_INSN(invalid_segment_patch2_ff,
402                                    invalid_segment_patch2);
403                         break;
404                 case 512:
405                         PATCH_INSN(invalid_segment_patch1_1ff,
406                                    invalid_segment_patch1);
407                         PATCH_INSN(invalid_segment_patch2_1ff,
408                                    invalid_segment_patch2);
409                         break;
410                 default:
411                         prom_printf("Unhandled number of segmaps: %d\n",
412                                     num_segmaps);
413                         prom_halt();
414         };
415         switch (num_contexts) {
416                 case 8:
417                         /* Default, nothing to do. */
418                         break;
419                 case 16:
420                         PATCH_INSN(num_context_patch1_16,
421                                    num_context_patch1);
422                         break;
423                 default:
424                         prom_printf("Unhandled number of contexts: %d\n",
425                                     num_contexts);
426                         prom_halt();
427         };
428
429         if (sun4c_vacinfo.do_hwflushes != 0) {
430                 PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1);
431                 PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2);
432         } else {
433                 switch (sun4c_vacinfo.linesize) {
434                 case 16:
435                         /* Default, nothing to do. */
436                         break;
437                 case 32:
438                         PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch);
439                         break;
440                 default:
441                         prom_printf("Impossible VAC linesize %d, halting...\n",
442                                     sun4c_vacinfo.linesize);
443                         prom_halt();
444                 };
445         }
446 }
447
448 static void __init sun4c_probe_mmu(void)
449 {
450         if (ARCH_SUN4) {
451                 switch (idprom->id_machtype) {
452                 case (SM_SUN4|SM_4_110):
453                         prom_printf("No support for 4100 yet\n");
454                         prom_halt();
455                         num_segmaps = 256;
456                         num_contexts = 8;
457                         break;
458
459                 case (SM_SUN4|SM_4_260):
460                         /* should be 512 segmaps. when it get fixed */
461                         num_segmaps = 256;
462                         num_contexts = 16;
463                         break;
464
465                 case (SM_SUN4|SM_4_330):
466                         num_segmaps = 256;
467                         num_contexts = 16;
468                         break;
469
470                 case (SM_SUN4|SM_4_470):
471                         /* should be 1024 segmaps. when it get fixed */
472                         num_segmaps = 256;
473                         num_contexts = 64;
474                         break;
475                 default:
476                         prom_printf("Invalid SUN4 model\n");
477                         prom_halt();
478                 };
479         } else {
480                 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
481                     (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
482                         /* Hardcode these just to be safe, PROM on SS1 does
483                         * not have this info available in the root node.
484                         */
485                         num_segmaps = 128;
486                         num_contexts = 8;
487                 } else {
488                         num_segmaps =
489                             prom_getintdefault(prom_root_node, "mmu-npmg", 128);
490                         num_contexts =
491                             prom_getintdefault(prom_root_node, "mmu-nctx", 0x8);
492                 }
493         }
494         patch_kernel_fault_handler();
495 }
496
497 volatile unsigned long __iomem *sun4c_memerr_reg = NULL;
498
499 void __init sun4c_probe_memerr_reg(void)
500 {
501         int node;
502         struct linux_prom_registers regs[1];
503
504         if (ARCH_SUN4) {
505                 sun4c_memerr_reg = ioremap(sun4_memreg_physaddr, PAGE_SIZE);
506         } else {
507                 node = prom_getchild(prom_root_node);
508                 node = prom_searchsiblings(prom_root_node, "memory-error");
509                 if (!node)
510                         return;
511                 if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0)
512                         return;
513                 /* hmm I think regs[0].which_io is zero here anyways */
514                 sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size);
515         }
516 }
517
518 static inline void sun4c_init_ss2_cache_bug(void)
519 {
520         extern unsigned long start;
521
522         if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) ||
523             (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) ||
524             (idprom->id_machtype == (SM_SUN4 | SM_4_330)) ||
525             (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) {
526                 /* Whee.. */
527                 printk("SS2 cache bug detected, uncaching trap table page\n");
528                 sun4c_flush_page((unsigned int) &start);
529                 sun4c_put_pte(((unsigned long) &start),
530                         (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE));
531         }
532 }
533
534 /* Addr is always aligned on a page boundary for us already. */
535 static int sun4c_map_dma_area(dma_addr_t *pba, unsigned long va,
536     unsigned long addr, int len)
537 {
538         unsigned long page, end;
539
540         *pba = addr;
541
542         end = PAGE_ALIGN((addr + len));
543         while (addr < end) {
544                 page = va;
545                 sun4c_flush_page(page);
546                 page -= PAGE_OFFSET;
547                 page >>= PAGE_SHIFT;
548                 page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY |
549                          _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV);
550                 sun4c_put_pte(addr, page);
551                 addr += PAGE_SIZE;
552                 va += PAGE_SIZE;
553         }
554
555         return 0;
556 }
557
558 static struct page *sun4c_translate_dvma(unsigned long busa)
559 {
560         /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
561         unsigned long pte = sun4c_get_pte(busa);
562         return pfn_to_page(pte & SUN4C_PFN_MASK);
563 }
564
565 static void sun4c_unmap_dma_area(unsigned long busa, int len)
566 {
567         /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
568         /* XXX Implement this */
569 }
570
571 /* TLB management. */
572
573 /* Don't change this struct without changing entry.S. This is used
574  * in the in-window kernel fault handler, and you don't want to mess
575  * with that. (See sun4c_fault in entry.S).
576  */
577 struct sun4c_mmu_entry {
578         struct sun4c_mmu_entry *next;
579         struct sun4c_mmu_entry *prev;
580         unsigned long vaddr;
581         unsigned char pseg;
582         unsigned char locked;
583
584         /* For user mappings only, and completely hidden from kernel
585          * TLB miss code.
586          */
587         unsigned char ctx;
588         struct sun4c_mmu_entry *lru_next;
589         struct sun4c_mmu_entry *lru_prev;
590 };
591
592 static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS];
593
594 static void __init sun4c_init_mmu_entry_pool(void)
595 {
596         int i;
597
598         for (i=0; i < SUN4C_MAX_SEGMAPS; i++) {
599                 mmu_entry_pool[i].pseg = i;
600                 mmu_entry_pool[i].next = NULL;
601                 mmu_entry_pool[i].prev = NULL;
602                 mmu_entry_pool[i].vaddr = 0;
603                 mmu_entry_pool[i].locked = 0;
604                 mmu_entry_pool[i].ctx = 0;
605                 mmu_entry_pool[i].lru_next = NULL;
606                 mmu_entry_pool[i].lru_prev = NULL;
607         }
608         mmu_entry_pool[invalid_segment].locked = 1;
609 }
610
611 static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on,
612                                    unsigned long bits_off)
613 {
614         unsigned long start, end;
615
616         end = vaddr + SUN4C_REAL_PGDIR_SIZE;
617         for (start = vaddr; start < end; start += PAGE_SIZE)
618                 if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID)
619                         sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) &
620                                       ~bits_off);
621 }
622
623 static inline void sun4c_init_map_kernelprom(unsigned long kernel_end)
624 {
625         unsigned long vaddr;
626         unsigned char pseg, ctx;
627 #ifdef CONFIG_SUN4
628         /* sun4/110 and 260 have no kadb. */
629         if ((idprom->id_machtype != (SM_SUN4 | SM_4_260)) && 
630             (idprom->id_machtype != (SM_SUN4 | SM_4_110))) {
631 #endif
632         for (vaddr = KADB_DEBUGGER_BEGVM;
633              vaddr < LINUX_OPPROM_ENDVM;
634              vaddr += SUN4C_REAL_PGDIR_SIZE) {
635                 pseg = sun4c_get_segmap(vaddr);
636                 if (pseg != invalid_segment) {
637                         mmu_entry_pool[pseg].locked = 1;
638                         for (ctx = 0; ctx < num_contexts; ctx++)
639                                 prom_putsegment(ctx, vaddr, pseg);
640                         fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0);
641                 }
642         }
643 #ifdef CONFIG_SUN4
644         }
645 #endif
646         for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) {
647                 pseg = sun4c_get_segmap(vaddr);
648                 mmu_entry_pool[pseg].locked = 1;
649                 for (ctx = 0; ctx < num_contexts; ctx++)
650                         prom_putsegment(ctx, vaddr, pseg);
651                 fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE);
652         }
653 }
654
655 static void __init sun4c_init_lock_area(unsigned long start, unsigned long end)
656 {
657         int i, ctx;
658
659         while (start < end) {
660                 for (i = 0; i < invalid_segment; i++)
661                         if (!mmu_entry_pool[i].locked)
662                                 break;
663                 mmu_entry_pool[i].locked = 1;
664                 sun4c_init_clean_segmap(i);
665                 for (ctx = 0; ctx < num_contexts; ctx++)
666                         prom_putsegment(ctx, start, mmu_entry_pool[i].pseg);
667                 start += SUN4C_REAL_PGDIR_SIZE;
668         }
669 }
670
671 /* Don't change this struct without changing entry.S. This is used
672  * in the in-window kernel fault handler, and you don't want to mess
673  * with that. (See sun4c_fault in entry.S).
674  */
675 struct sun4c_mmu_ring {
676         struct sun4c_mmu_entry ringhd;
677         int num_entries;
678 };
679
680 static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */
681 static struct sun4c_mmu_ring sun4c_ufree_ring;       /* free user entries */
682 static struct sun4c_mmu_ring sun4c_ulru_ring;        /* LRU user entries */
683 struct sun4c_mmu_ring sun4c_kernel_ring;      /* used kernel entries */
684 struct sun4c_mmu_ring sun4c_kfree_ring;       /* free kernel entries */
685
686 static inline void sun4c_init_rings(void)
687 {
688         int i;
689
690         for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) {
691                 sun4c_context_ring[i].ringhd.next =
692                         sun4c_context_ring[i].ringhd.prev =
693                         &sun4c_context_ring[i].ringhd;
694                 sun4c_context_ring[i].num_entries = 0;
695         }
696         sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev =
697                 &sun4c_ufree_ring.ringhd;
698         sun4c_ufree_ring.num_entries = 0;
699         sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev =
700                 &sun4c_ulru_ring.ringhd;
701         sun4c_ulru_ring.num_entries = 0;
702         sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev =
703                 &sun4c_kernel_ring.ringhd;
704         sun4c_kernel_ring.num_entries = 0;
705         sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev =
706                 &sun4c_kfree_ring.ringhd;
707         sun4c_kfree_ring.num_entries = 0;
708 }
709
710 static void add_ring(struct sun4c_mmu_ring *ring,
711                      struct sun4c_mmu_entry *entry)
712 {
713         struct sun4c_mmu_entry *head = &ring->ringhd;
714
715         entry->prev = head;
716         (entry->next = head->next)->prev = entry;
717         head->next = entry;
718         ring->num_entries++;
719 }
720
721 static inline void add_lru(struct sun4c_mmu_entry *entry)
722 {
723         struct sun4c_mmu_ring *ring = &sun4c_ulru_ring;
724         struct sun4c_mmu_entry *head = &ring->ringhd;
725
726         entry->lru_next = head;
727         (entry->lru_prev = head->lru_prev)->lru_next = entry;
728         head->lru_prev = entry;
729 }
730
731 static void add_ring_ordered(struct sun4c_mmu_ring *ring,
732                              struct sun4c_mmu_entry *entry)
733 {
734         struct sun4c_mmu_entry *head = &ring->ringhd;
735         unsigned long addr = entry->vaddr;
736
737         while ((head->next != &ring->ringhd) && (head->next->vaddr < addr))
738                 head = head->next;
739
740         entry->prev = head;
741         (entry->next = head->next)->prev = entry;
742         head->next = entry;
743         ring->num_entries++;
744
745         add_lru(entry);
746 }
747
748 static inline void remove_ring(struct sun4c_mmu_ring *ring,
749                                    struct sun4c_mmu_entry *entry)
750 {
751         struct sun4c_mmu_entry *next = entry->next;
752
753         (next->prev = entry->prev)->next = next;
754         ring->num_entries--;
755 }
756
757 static void remove_lru(struct sun4c_mmu_entry *entry)
758 {
759         struct sun4c_mmu_entry *next = entry->lru_next;
760
761         (next->lru_prev = entry->lru_prev)->lru_next = next;
762 }
763
764 static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry)
765 {
766         remove_ring(sun4c_context_ring+ctx, entry);
767         remove_lru(entry);
768         add_ring(&sun4c_ufree_ring, entry);
769 }
770
771 static void free_kernel_entry(struct sun4c_mmu_entry *entry,
772                               struct sun4c_mmu_ring *ring)
773 {
774         remove_ring(ring, entry);
775         add_ring(&sun4c_kfree_ring, entry);
776 }
777
778 static void __init sun4c_init_fill_kernel_ring(int howmany)
779 {
780         int i;
781
782         while (howmany) {
783                 for (i = 0; i < invalid_segment; i++)
784                         if (!mmu_entry_pool[i].locked)
785                                 break;
786                 mmu_entry_pool[i].locked = 1;
787                 sun4c_init_clean_segmap(i);
788                 add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]);
789                 howmany--;
790         }
791 }
792
793 static void __init sun4c_init_fill_user_ring(void)
794 {
795         int i;
796
797         for (i = 0; i < invalid_segment; i++) {
798                 if (mmu_entry_pool[i].locked)
799                         continue;
800                 sun4c_init_clean_segmap(i);
801                 add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]);
802         }
803 }
804
805 static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry)
806 {
807         int savectx, ctx;
808
809         savectx = sun4c_get_context();
810         for (ctx = 0; ctx < num_contexts; ctx++) {
811                 sun4c_set_context(ctx);
812                 sun4c_put_segmap(kentry->vaddr, invalid_segment);
813         }
814         sun4c_set_context(savectx);
815 }
816
817 static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry)
818 {
819         int savectx, ctx;
820
821         savectx = sun4c_get_context();
822         for (ctx = 0; ctx < num_contexts; ctx++) {
823                 sun4c_set_context(ctx);
824                 sun4c_put_segmap(kentry->vaddr, kentry->pseg);
825         }
826         sun4c_set_context(savectx);
827 }
828
829 #define sun4c_user_unmap(__entry) \
830         sun4c_put_segmap((__entry)->vaddr, invalid_segment)
831
832 static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx)
833 {
834         struct sun4c_mmu_entry *head = &crp->ringhd;
835         unsigned long flags;
836
837         local_irq_save(flags);
838         if (head->next != head) {
839                 struct sun4c_mmu_entry *entry = head->next;
840                 int savectx = sun4c_get_context();
841
842                 flush_user_windows();
843                 sun4c_set_context(ctx);
844                 sun4c_flush_context();
845                 do {
846                         struct sun4c_mmu_entry *next = entry->next;
847
848                         sun4c_user_unmap(entry);
849                         free_user_entry(ctx, entry);
850
851                         entry = next;
852                 } while (entry != head);
853                 sun4c_set_context(savectx);
854         }
855         local_irq_restore(flags);
856 }
857
858 static int sun4c_user_taken_entries;  /* This is how much we have.             */
859 static int max_user_taken_entries;    /* This limits us and prevents deadlock. */
860
861 static struct sun4c_mmu_entry *sun4c_kernel_strategy(void)
862 {
863         struct sun4c_mmu_entry *this_entry;
864
865         /* If some are free, return first one. */
866         if (sun4c_kfree_ring.num_entries) {
867                 this_entry = sun4c_kfree_ring.ringhd.next;
868                 return this_entry;
869         }
870
871         /* Else free one up. */
872         this_entry = sun4c_kernel_ring.ringhd.prev;
873         sun4c_flush_segment(this_entry->vaddr);
874         sun4c_kernel_unmap(this_entry);
875         free_kernel_entry(this_entry, &sun4c_kernel_ring);
876         this_entry = sun4c_kfree_ring.ringhd.next;
877
878         return this_entry;
879 }
880
881 /* Using this method to free up mmu entries eliminates a lot of
882  * potential races since we have a kernel that incurs tlb
883  * replacement faults.  There may be performance penalties.
884  *
885  * NOTE: Must be called with interrupts disabled.
886  */
887 static struct sun4c_mmu_entry *sun4c_user_strategy(void)
888 {
889         struct sun4c_mmu_entry *entry;
890         unsigned char ctx;
891         int savectx;
892
893         /* If some are free, return first one. */
894         if (sun4c_ufree_ring.num_entries) {
895                 entry = sun4c_ufree_ring.ringhd.next;
896                 goto unlink_out;
897         }
898
899         if (sun4c_user_taken_entries) {
900                 entry = sun4c_kernel_strategy();
901                 sun4c_user_taken_entries--;
902                 goto kunlink_out;
903         }
904
905         /* Grab from the beginning of the LRU list. */
906         entry = sun4c_ulru_ring.ringhd.lru_next;
907         ctx = entry->ctx;
908
909         savectx = sun4c_get_context();
910         flush_user_windows();
911         sun4c_set_context(ctx);
912         sun4c_flush_segment(entry->vaddr);
913         sun4c_user_unmap(entry);
914         remove_ring(sun4c_context_ring + ctx, entry);
915         remove_lru(entry);
916         sun4c_set_context(savectx);
917
918         return entry;
919
920 unlink_out:
921         remove_ring(&sun4c_ufree_ring, entry);
922         return entry;
923 kunlink_out:
924         remove_ring(&sun4c_kfree_ring, entry);
925         return entry;
926 }
927
928 /* NOTE: Must be called with interrupts disabled. */
929 void sun4c_grow_kernel_ring(void)
930 {
931         struct sun4c_mmu_entry *entry;
932
933         /* Prevent deadlock condition. */
934         if (sun4c_user_taken_entries >= max_user_taken_entries)
935                 return;
936
937         if (sun4c_ufree_ring.num_entries) {
938                 entry = sun4c_ufree_ring.ringhd.next;
939                 remove_ring(&sun4c_ufree_ring, entry);
940                 add_ring(&sun4c_kfree_ring, entry);
941                 sun4c_user_taken_entries++;
942         }
943 }
944
945 /* 2 page buckets for task struct and kernel stack allocation.
946  *
947  * TASK_STACK_BEGIN
948  * bucket[0]
949  * bucket[1]
950  *   [ ... ]
951  * bucket[NR_TASK_BUCKETS-1]
952  * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS)
953  *
954  * Each slot looks like:
955  *
956  *  page 1 --  task struct + beginning of kernel stack
957  *  page 2 --  rest of kernel stack
958  */
959
960 union task_union *sun4c_bucket[NR_TASK_BUCKETS];
961
962 static int sun4c_lowbucket_avail;
963
964 #define BUCKET_EMPTY     ((union task_union *) 0)
965 #define BUCKET_SHIFT     (PAGE_SHIFT + 1)        /* log2(sizeof(struct task_bucket)) */
966 #define BUCKET_SIZE      (1 << BUCKET_SHIFT)
967 #define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT))
968 #define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR)
969 #define BUCKET_PTE(page)       \
970         ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL))
971 #define BUCKET_PTE_PAGE(pte)   \
972         (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT))
973
974 static void get_locked_segment(unsigned long addr)
975 {
976         struct sun4c_mmu_entry *stolen;
977         unsigned long flags;
978
979         local_irq_save(flags);
980         addr &= SUN4C_REAL_PGDIR_MASK;
981         stolen = sun4c_user_strategy();
982         max_user_taken_entries--;
983         stolen->vaddr = addr;
984         flush_user_windows();
985         sun4c_kernel_map(stolen);
986         local_irq_restore(flags);
987 }
988
989 static void free_locked_segment(unsigned long addr)
990 {
991         struct sun4c_mmu_entry *entry;
992         unsigned long flags;
993         unsigned char pseg;
994
995         local_irq_save(flags);
996         addr &= SUN4C_REAL_PGDIR_MASK;
997         pseg = sun4c_get_segmap(addr);
998         entry = &mmu_entry_pool[pseg];
999
1000         flush_user_windows();
1001         sun4c_flush_segment(addr);
1002         sun4c_kernel_unmap(entry);
1003         add_ring(&sun4c_ufree_ring, entry);
1004         max_user_taken_entries++;
1005         local_irq_restore(flags);
1006 }
1007
1008 static inline void garbage_collect(int entry)
1009 {
1010         int start, end;
1011
1012         /* 32 buckets per segment... */
1013         entry &= ~31;
1014         start = entry;
1015         for (end = (start + 32); start < end; start++)
1016                 if (sun4c_bucket[start] != BUCKET_EMPTY)
1017                         return;
1018
1019         /* Entire segment empty, release it. */
1020         free_locked_segment(BUCKET_ADDR(entry));
1021 }
1022
1023 static struct thread_info *sun4c_alloc_thread_info(void)
1024 {
1025         unsigned long addr, pages;
1026         int entry;
1027
1028         pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER);
1029         if (!pages)
1030                 return NULL;
1031
1032         for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++)
1033                 if (sun4c_bucket[entry] == BUCKET_EMPTY)
1034                         break;
1035         if (entry == NR_TASK_BUCKETS) {
1036                 free_pages(pages, THREAD_INFO_ORDER);
1037                 return NULL;
1038         }
1039         if (entry >= sun4c_lowbucket_avail)
1040                 sun4c_lowbucket_avail = entry + 1;
1041
1042         addr = BUCKET_ADDR(entry);
1043         sun4c_bucket[entry] = (union task_union *) addr;
1044         if(sun4c_get_segmap(addr) == invalid_segment)
1045                 get_locked_segment(addr);
1046
1047         /* We are changing the virtual color of the page(s)
1048          * so we must flush the cache to guarantee consistency.
1049          */
1050         sun4c_flush_page(pages);
1051 #ifndef CONFIG_SUN4     
1052         sun4c_flush_page(pages + PAGE_SIZE);
1053 #endif
1054
1055         sun4c_put_pte(addr, BUCKET_PTE(pages));
1056 #ifndef CONFIG_SUN4     
1057         sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE));
1058 #endif
1059
1060 #ifdef CONFIG_DEBUG_STACK_USAGE
1061         memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER);
1062 #endif /* DEBUG_STACK_USAGE */
1063
1064         return (struct thread_info *) addr;
1065 }
1066
1067 static void sun4c_free_thread_info(struct thread_info *ti)
1068 {
1069         unsigned long tiaddr = (unsigned long) ti;
1070         unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr));
1071         int entry = BUCKET_NUM(tiaddr);
1072
1073         /* We are deleting a mapping, so the flush here is mandatory. */
1074         sun4c_flush_page(tiaddr);
1075 #ifndef CONFIG_SUN4     
1076         sun4c_flush_page(tiaddr + PAGE_SIZE);
1077 #endif
1078         sun4c_put_pte(tiaddr, 0);
1079 #ifndef CONFIG_SUN4     
1080         sun4c_put_pte(tiaddr + PAGE_SIZE, 0);
1081 #endif
1082         sun4c_bucket[entry] = BUCKET_EMPTY;
1083         if (entry < sun4c_lowbucket_avail)
1084                 sun4c_lowbucket_avail = entry;
1085
1086         free_pages(pages, THREAD_INFO_ORDER);
1087         garbage_collect(entry);
1088 }
1089
1090 static void __init sun4c_init_buckets(void)
1091 {
1092         int entry;
1093
1094         if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) {
1095                 extern void thread_info_size_is_bolixed_pete(void);
1096                 thread_info_size_is_bolixed_pete();
1097         }
1098
1099         for (entry = 0; entry < NR_TASK_BUCKETS; entry++)
1100                 sun4c_bucket[entry] = BUCKET_EMPTY;
1101         sun4c_lowbucket_avail = 0;
1102 }
1103
1104 static unsigned long sun4c_iobuffer_start;
1105 static unsigned long sun4c_iobuffer_end;
1106 static unsigned long sun4c_iobuffer_high;
1107 static unsigned long *sun4c_iobuffer_map;
1108 static int iobuffer_map_size;
1109
1110 /*
1111  * Alias our pages so they do not cause a trap.
1112  * Also one page may be aliased into several I/O areas and we may
1113  * finish these I/O separately.
1114  */
1115 static char *sun4c_lockarea(char *vaddr, unsigned long size)
1116 {
1117         unsigned long base, scan;
1118         unsigned long npages;
1119         unsigned long vpage;
1120         unsigned long pte;
1121         unsigned long apage;
1122         unsigned long high;
1123         unsigned long flags;
1124
1125         npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1126                   size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1127
1128         scan = 0;
1129         local_irq_save(flags);
1130         for (;;) {
1131                 scan = find_next_zero_bit(sun4c_iobuffer_map,
1132                                           iobuffer_map_size, scan);
1133                 if ((base = scan) + npages > iobuffer_map_size) goto abend;
1134                 for (;;) {
1135                         if (scan >= base + npages) goto found;
1136                         if (test_bit(scan, sun4c_iobuffer_map)) break;
1137                         scan++;
1138                 }
1139         }
1140
1141 found:
1142         high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start;
1143         high = SUN4C_REAL_PGDIR_ALIGN(high);
1144         while (high > sun4c_iobuffer_high) {
1145                 get_locked_segment(sun4c_iobuffer_high);
1146                 sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE;
1147         }
1148
1149         vpage = ((unsigned long) vaddr) & PAGE_MASK;
1150         for (scan = base; scan < base+npages; scan++) {
1151                 pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT);
1152                 pte |= pgprot_val(SUN4C_PAGE_KERNEL);
1153                 pte |= _SUN4C_PAGE_NOCACHE;
1154                 set_bit(scan, sun4c_iobuffer_map);
1155                 apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start;
1156
1157                 /* Flush original mapping so we see the right things later. */
1158                 sun4c_flush_page(vpage);
1159
1160                 sun4c_put_pte(apage, pte);
1161                 vpage += PAGE_SIZE;
1162         }
1163         local_irq_restore(flags);
1164         return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start +
1165                          (((unsigned long) vaddr) & ~PAGE_MASK));
1166
1167 abend:
1168         local_irq_restore(flags);
1169         printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size);
1170         panic("Out of iobuffer table");
1171         return NULL;
1172 }
1173
1174 static void sun4c_unlockarea(char *vaddr, unsigned long size)
1175 {
1176         unsigned long vpage, npages;
1177         unsigned long flags;
1178         int scan, high;
1179
1180         vpage = (unsigned long)vaddr & PAGE_MASK;
1181         npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1182                   size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1183
1184         local_irq_save(flags);
1185         while (npages != 0) {
1186                 --npages;
1187
1188                 /* This mapping is marked non-cachable, no flush necessary. */
1189                 sun4c_put_pte(vpage, 0);
1190                 clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT,
1191                           sun4c_iobuffer_map);
1192                 vpage += PAGE_SIZE;
1193         }
1194
1195         /* garbage collect */
1196         scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT;
1197         while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5])
1198                 scan -= 32;
1199         scan += 32;
1200         high = sun4c_iobuffer_start + (scan << PAGE_SHIFT);
1201         high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE;
1202         while (high < sun4c_iobuffer_high) {
1203                 sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE;
1204                 free_locked_segment(sun4c_iobuffer_high);
1205         }
1206         local_irq_restore(flags);
1207 }
1208
1209 /* Note the scsi code at init time passes to here buffers
1210  * which sit on the kernel stack, those are already locked
1211  * by implication and fool the page locking code above
1212  * if passed to by mistake.
1213  */
1214 static __u32 sun4c_get_scsi_one(char *bufptr, unsigned long len, struct sbus_bus *sbus)
1215 {
1216         unsigned long page;
1217
1218         page = ((unsigned long)bufptr) & PAGE_MASK;
1219         if (!virt_addr_valid(page)) {
1220                 sun4c_flush_page(page);
1221                 return (__u32)bufptr; /* already locked */
1222         }
1223         return (__u32)sun4c_lockarea(bufptr, len);
1224 }
1225
1226 static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1227 {
1228         while (sz != 0) {
1229                 --sz;
1230                 sg->dvma_address = (__u32)sun4c_lockarea(sg_virt(sg), sg->length);
1231                 sg->dvma_length = sg->length;
1232                 sg = sg_next(sg);
1233         }
1234 }
1235
1236 static void sun4c_release_scsi_one(__u32 bufptr, unsigned long len, struct sbus_bus *sbus)
1237 {
1238         if (bufptr < sun4c_iobuffer_start)
1239                 return; /* On kernel stack or similar, see above */
1240         sun4c_unlockarea((char *)bufptr, len);
1241 }
1242
1243 static void sun4c_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1244 {
1245         while (sz != 0) {
1246                 --sz;
1247                 sun4c_unlockarea((char *)sg->dvma_address, sg->length);
1248                 sg = sg_next(sg);
1249         }
1250 }
1251
1252 #define TASK_ENTRY_SIZE    BUCKET_SIZE /* see above */
1253 #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
1254
1255 struct vm_area_struct sun4c_kstack_vma;
1256
1257 static void __init sun4c_init_lock_areas(void)
1258 {
1259         unsigned long sun4c_taskstack_start;
1260         unsigned long sun4c_taskstack_end;
1261         int bitmap_size;
1262
1263         sun4c_init_buckets();
1264         sun4c_taskstack_start = SUN4C_LOCK_VADDR;
1265         sun4c_taskstack_end = (sun4c_taskstack_start +
1266                                (TASK_ENTRY_SIZE * NR_TASK_BUCKETS));
1267         if (sun4c_taskstack_end >= SUN4C_LOCK_END) {
1268                 prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n");
1269                 prom_halt();
1270         }
1271
1272         sun4c_iobuffer_start = sun4c_iobuffer_high =
1273                                 SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end);
1274         sun4c_iobuffer_end = SUN4C_LOCK_END;
1275         bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT;
1276         bitmap_size = (bitmap_size + 7) >> 3;
1277         bitmap_size = LONG_ALIGN(bitmap_size);
1278         iobuffer_map_size = bitmap_size << 3;
1279         sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL);
1280         memset((void *) sun4c_iobuffer_map, 0, bitmap_size);
1281
1282         sun4c_kstack_vma.vm_mm = &init_mm;
1283         sun4c_kstack_vma.vm_start = sun4c_taskstack_start;
1284         sun4c_kstack_vma.vm_end = sun4c_taskstack_end;
1285         sun4c_kstack_vma.vm_page_prot = PAGE_SHARED;
1286         sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC;
1287         insert_vm_struct(&init_mm, &sun4c_kstack_vma);
1288 }
1289
1290 /* Cache flushing on the sun4c. */
1291 static void sun4c_flush_cache_all(void)
1292 {
1293         unsigned long begin, end;
1294
1295         flush_user_windows();
1296         begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE);
1297         end = (begin + SUN4C_VAC_SIZE);
1298
1299         if (sun4c_vacinfo.linesize == 32) {
1300                 while (begin < end) {
1301                         __asm__ __volatile__(
1302                         "ld     [%0 + 0x00], %%g0\n\t"
1303                         "ld     [%0 + 0x20], %%g0\n\t"
1304                         "ld     [%0 + 0x40], %%g0\n\t"
1305                         "ld     [%0 + 0x60], %%g0\n\t"
1306                         "ld     [%0 + 0x80], %%g0\n\t"
1307                         "ld     [%0 + 0xa0], %%g0\n\t"
1308                         "ld     [%0 + 0xc0], %%g0\n\t"
1309                         "ld     [%0 + 0xe0], %%g0\n\t"
1310                         "ld     [%0 + 0x100], %%g0\n\t"
1311                         "ld     [%0 + 0x120], %%g0\n\t"
1312                         "ld     [%0 + 0x140], %%g0\n\t"
1313                         "ld     [%0 + 0x160], %%g0\n\t"
1314                         "ld     [%0 + 0x180], %%g0\n\t"
1315                         "ld     [%0 + 0x1a0], %%g0\n\t"
1316                         "ld     [%0 + 0x1c0], %%g0\n\t"
1317                         "ld     [%0 + 0x1e0], %%g0\n"
1318                         : : "r" (begin));
1319                         begin += 512;
1320                 }
1321         } else {
1322                 while (begin < end) {
1323                         __asm__ __volatile__(
1324                         "ld     [%0 + 0x00], %%g0\n\t"
1325                         "ld     [%0 + 0x10], %%g0\n\t"
1326                         "ld     [%0 + 0x20], %%g0\n\t"
1327                         "ld     [%0 + 0x30], %%g0\n\t"
1328                         "ld     [%0 + 0x40], %%g0\n\t"
1329                         "ld     [%0 + 0x50], %%g0\n\t"
1330                         "ld     [%0 + 0x60], %%g0\n\t"
1331                         "ld     [%0 + 0x70], %%g0\n\t"
1332                         "ld     [%0 + 0x80], %%g0\n\t"
1333                         "ld     [%0 + 0x90], %%g0\n\t"
1334                         "ld     [%0 + 0xa0], %%g0\n\t"
1335                         "ld     [%0 + 0xb0], %%g0\n\t"
1336                         "ld     [%0 + 0xc0], %%g0\n\t"
1337                         "ld     [%0 + 0xd0], %%g0\n\t"
1338                         "ld     [%0 + 0xe0], %%g0\n\t"
1339                         "ld     [%0 + 0xf0], %%g0\n"
1340                         : : "r" (begin));
1341                         begin += 256;
1342                 }
1343         }
1344 }
1345
1346 static void sun4c_flush_cache_mm(struct mm_struct *mm)
1347 {
1348         int new_ctx = mm->context;
1349
1350         if (new_ctx != NO_CONTEXT) {
1351                 flush_user_windows();
1352
1353                 if (sun4c_context_ring[new_ctx].num_entries) {
1354                         struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1355                         unsigned long flags;
1356
1357                         local_irq_save(flags);
1358                         if (head->next != head) {
1359                                 struct sun4c_mmu_entry *entry = head->next;
1360                                 int savectx = sun4c_get_context();
1361
1362                                 sun4c_set_context(new_ctx);
1363                                 sun4c_flush_context();
1364                                 do {
1365                                         struct sun4c_mmu_entry *next = entry->next;
1366
1367                                         sun4c_user_unmap(entry);
1368                                         free_user_entry(new_ctx, entry);
1369
1370                                         entry = next;
1371                                 } while (entry != head);
1372                                 sun4c_set_context(savectx);
1373                         }
1374                         local_irq_restore(flags);
1375                 }
1376         }
1377 }
1378
1379 static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1380 {
1381         struct mm_struct *mm = vma->vm_mm;
1382         int new_ctx = mm->context;
1383
1384         if (new_ctx != NO_CONTEXT) {
1385                 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1386                 struct sun4c_mmu_entry *entry;
1387                 unsigned long flags;
1388
1389                 flush_user_windows();
1390
1391                 local_irq_save(flags);
1392                 /* All user segmap chains are ordered on entry->vaddr. */
1393                 for (entry = head->next;
1394                      (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1395                      entry = entry->next)
1396                         ;
1397
1398                 /* Tracing various job mixtures showed that this conditional
1399                  * only passes ~35% of the time for most worse case situations,
1400                  * therefore we avoid all of this gross overhead ~65% of the time.
1401                  */
1402                 if ((entry != head) && (entry->vaddr < end)) {
1403                         int octx = sun4c_get_context();
1404                         sun4c_set_context(new_ctx);
1405
1406                         /* At this point, always, (start >= entry->vaddr) and
1407                          * (entry->vaddr < end), once the latter condition
1408                          * ceases to hold, or we hit the end of the list, we
1409                          * exit the loop.  The ordering of all user allocated
1410                          * segmaps makes this all work out so beautifully.
1411                          */
1412                         do {
1413                                 struct sun4c_mmu_entry *next = entry->next;
1414                                 unsigned long realend;
1415
1416                                 /* "realstart" is always >= entry->vaddr */
1417                                 realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE;
1418                                 if (end < realend)
1419                                         realend = end;
1420                                 if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) {
1421                                         unsigned long page = entry->vaddr;
1422                                         while (page < realend) {
1423                                                 sun4c_flush_page(page);
1424                                                 page += PAGE_SIZE;
1425                                         }
1426                                 } else {
1427                                         sun4c_flush_segment(entry->vaddr);
1428                                         sun4c_user_unmap(entry);
1429                                         free_user_entry(new_ctx, entry);
1430                                 }
1431                                 entry = next;
1432                         } while ((entry != head) && (entry->vaddr < end));
1433                         sun4c_set_context(octx);
1434                 }
1435                 local_irq_restore(flags);
1436         }
1437 }
1438
1439 static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
1440 {
1441         struct mm_struct *mm = vma->vm_mm;
1442         int new_ctx = mm->context;
1443
1444         /* Sun4c has no separate I/D caches so cannot optimize for non
1445          * text page flushes.
1446          */
1447         if (new_ctx != NO_CONTEXT) {
1448                 int octx = sun4c_get_context();
1449                 unsigned long flags;
1450
1451                 flush_user_windows();
1452                 local_irq_save(flags);
1453                 sun4c_set_context(new_ctx);
1454                 sun4c_flush_page(page);
1455                 sun4c_set_context(octx);
1456                 local_irq_restore(flags);
1457         }
1458 }
1459
1460 static void sun4c_flush_page_to_ram(unsigned long page)
1461 {
1462         unsigned long flags;
1463
1464         local_irq_save(flags);
1465         sun4c_flush_page(page);
1466         local_irq_restore(flags);
1467 }
1468
1469 /* Sun4c cache is unified, both instructions and data live there, so
1470  * no need to flush the on-stack instructions for new signal handlers.
1471  */
1472 static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
1473 {
1474 }
1475
1476 /* TLB flushing on the sun4c.  These routines count on the cache
1477  * flushing code to flush the user register windows so that we need
1478  * not do so when we get here.
1479  */
1480
1481 static void sun4c_flush_tlb_all(void)
1482 {
1483         struct sun4c_mmu_entry *this_entry, *next_entry;
1484         unsigned long flags;
1485         int savectx, ctx;
1486
1487         local_irq_save(flags);
1488         this_entry = sun4c_kernel_ring.ringhd.next;
1489         savectx = sun4c_get_context();
1490         flush_user_windows();
1491         while (sun4c_kernel_ring.num_entries) {
1492                 next_entry = this_entry->next;
1493                 sun4c_flush_segment(this_entry->vaddr);
1494                 for (ctx = 0; ctx < num_contexts; ctx++) {
1495                         sun4c_set_context(ctx);
1496                         sun4c_put_segmap(this_entry->vaddr, invalid_segment);
1497                 }
1498                 free_kernel_entry(this_entry, &sun4c_kernel_ring);
1499                 this_entry = next_entry;
1500         }
1501         sun4c_set_context(savectx);
1502         local_irq_restore(flags);
1503 }
1504
1505 static void sun4c_flush_tlb_mm(struct mm_struct *mm)
1506 {
1507         int new_ctx = mm->context;
1508
1509         if (new_ctx != NO_CONTEXT) {
1510                 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1511                 unsigned long flags;
1512
1513                 local_irq_save(flags);
1514                 if (head->next != head) {
1515                         struct sun4c_mmu_entry *entry = head->next;
1516                         int savectx = sun4c_get_context();
1517
1518                         sun4c_set_context(new_ctx);
1519                         sun4c_flush_context();
1520                         do {
1521                                 struct sun4c_mmu_entry *next = entry->next;
1522
1523                                 sun4c_user_unmap(entry);
1524                                 free_user_entry(new_ctx, entry);
1525
1526                                 entry = next;
1527                         } while (entry != head);
1528                         sun4c_set_context(savectx);
1529                 }
1530                 local_irq_restore(flags);
1531         }
1532 }
1533
1534 static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1535 {
1536         struct mm_struct *mm = vma->vm_mm;
1537         int new_ctx = mm->context;
1538
1539         if (new_ctx != NO_CONTEXT) {
1540                 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1541                 struct sun4c_mmu_entry *entry;
1542                 unsigned long flags;
1543
1544                 local_irq_save(flags);
1545                 /* See commentary in sun4c_flush_cache_range(). */
1546                 for (entry = head->next;
1547                      (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1548                      entry = entry->next)
1549                         ;
1550
1551                 if ((entry != head) && (entry->vaddr < end)) {
1552                         int octx = sun4c_get_context();
1553
1554                         sun4c_set_context(new_ctx);
1555                         do {
1556                                 struct sun4c_mmu_entry *next = entry->next;
1557
1558                                 sun4c_flush_segment(entry->vaddr);
1559                                 sun4c_user_unmap(entry);
1560                                 free_user_entry(new_ctx, entry);
1561
1562                                 entry = next;
1563                         } while ((entry != head) && (entry->vaddr < end));
1564                         sun4c_set_context(octx);
1565                 }
1566                 local_irq_restore(flags);
1567         }
1568 }
1569
1570 static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
1571 {
1572         struct mm_struct *mm = vma->vm_mm;
1573         int new_ctx = mm->context;
1574
1575         if (new_ctx != NO_CONTEXT) {
1576                 int savectx = sun4c_get_context();
1577                 unsigned long flags;
1578
1579                 local_irq_save(flags);
1580                 sun4c_set_context(new_ctx);
1581                 page &= PAGE_MASK;
1582                 sun4c_flush_page(page);
1583                 sun4c_put_pte(page, 0);
1584                 sun4c_set_context(savectx);
1585                 local_irq_restore(flags);
1586         }
1587 }
1588
1589 static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr)
1590 {
1591         unsigned long page_entry, pg_iobits;
1592
1593         pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE |
1594                     _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE;
1595
1596         page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK);
1597         page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT));
1598         sun4c_put_pte(virt_addr, page_entry);
1599 }
1600
1601 static void sun4c_mapiorange(unsigned int bus, unsigned long xpa,
1602     unsigned long xva, unsigned int len)
1603 {
1604         while (len != 0) {
1605                 len -= PAGE_SIZE;
1606                 sun4c_mapioaddr(xpa, xva);
1607                 xva += PAGE_SIZE;
1608                 xpa += PAGE_SIZE;
1609         }
1610 }
1611
1612 static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len)
1613 {
1614         while (len != 0) {
1615                 len -= PAGE_SIZE;
1616                 sun4c_put_pte(virt_addr, 0);
1617                 virt_addr += PAGE_SIZE;
1618         }
1619 }
1620
1621 static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm)
1622 {
1623         struct ctx_list *ctxp;
1624
1625         ctxp = ctx_free.next;
1626         if (ctxp != &ctx_free) {
1627                 remove_from_ctx_list(ctxp);
1628                 add_to_used_ctxlist(ctxp);
1629                 mm->context = ctxp->ctx_number;
1630                 ctxp->ctx_mm = mm;
1631                 return;
1632         }
1633         ctxp = ctx_used.next;
1634         if (ctxp->ctx_mm == old_mm)
1635                 ctxp = ctxp->next;
1636         remove_from_ctx_list(ctxp);
1637         add_to_used_ctxlist(ctxp);
1638         ctxp->ctx_mm->context = NO_CONTEXT;
1639         ctxp->ctx_mm = mm;
1640         mm->context = ctxp->ctx_number;
1641         sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number],
1642                                ctxp->ctx_number);
1643 }
1644
1645 /* Switch the current MM context. */
1646 static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu)
1647 {
1648         struct ctx_list *ctx;
1649         int dirty = 0;
1650
1651         if (mm->context == NO_CONTEXT) {
1652                 dirty = 1;
1653                 sun4c_alloc_context(old_mm, mm);
1654         } else {
1655                 /* Update the LRU ring of contexts. */
1656                 ctx = ctx_list_pool + mm->context;
1657                 remove_from_ctx_list(ctx);
1658                 add_to_used_ctxlist(ctx);
1659         }
1660         if (dirty || old_mm != mm)
1661                 sun4c_set_context(mm->context);
1662 }
1663
1664 static void sun4c_destroy_context(struct mm_struct *mm)
1665 {
1666         struct ctx_list *ctx_old;
1667
1668         if (mm->context != NO_CONTEXT) {
1669                 sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context);
1670                 ctx_old = ctx_list_pool + mm->context;
1671                 remove_from_ctx_list(ctx_old);
1672                 add_to_free_ctxlist(ctx_old);
1673                 mm->context = NO_CONTEXT;
1674         }
1675 }
1676
1677 static void sun4c_mmu_info(struct seq_file *m)
1678 {
1679         int used_user_entries, i;
1680
1681         used_user_entries = 0;
1682         for (i = 0; i < num_contexts; i++)
1683                 used_user_entries += sun4c_context_ring[i].num_entries;
1684
1685         seq_printf(m, 
1686                    "vacsize\t\t: %d bytes\n"
1687                    "vachwflush\t: %s\n"
1688                    "vaclinesize\t: %d bytes\n"
1689                    "mmuctxs\t\t: %d\n"
1690                    "mmupsegs\t: %d\n"
1691                    "kernelpsegs\t: %d\n"
1692                    "kfreepsegs\t: %d\n"
1693                    "usedpsegs\t: %d\n"
1694                    "ufreepsegs\t: %d\n"
1695                    "user_taken\t: %d\n"
1696                    "max_taken\t: %d\n",
1697                    sun4c_vacinfo.num_bytes,
1698                    (sun4c_vacinfo.do_hwflushes ? "yes" : "no"),
1699                    sun4c_vacinfo.linesize,
1700                    num_contexts,
1701                    (invalid_segment + 1),
1702                    sun4c_kernel_ring.num_entries,
1703                    sun4c_kfree_ring.num_entries,
1704                    used_user_entries,
1705                    sun4c_ufree_ring.num_entries,
1706                    sun4c_user_taken_entries,
1707                    max_user_taken_entries);
1708 }
1709
1710 /* Nothing below here should touch the mmu hardware nor the mmu_entry
1711  * data structures.
1712  */
1713
1714 /* First the functions which the mid-level code uses to directly
1715  * manipulate the software page tables.  Some defines since we are
1716  * emulating the i386 page directory layout.
1717  */
1718 #define PGD_PRESENT  0x001
1719 #define PGD_RW       0x002
1720 #define PGD_USER     0x004
1721 #define PGD_ACCESSED 0x020
1722 #define PGD_DIRTY    0x040
1723 #define PGD_TABLE    (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY)
1724
1725 static void sun4c_set_pte(pte_t *ptep, pte_t pte)
1726 {
1727         *ptep = pte;
1728 }
1729
1730 static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp)
1731 {
1732 }
1733
1734 static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep)
1735 {
1736         pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep;
1737 }
1738
1739 static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep)
1740 {
1741         if (page_address(ptep) == NULL) BUG();  /* No highmem on sun4c */
1742         pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep);
1743 }
1744
1745 static int sun4c_pte_present(pte_t pte)
1746 {
1747         return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0);
1748 }
1749 static void sun4c_pte_clear(pte_t *ptep)        { *ptep = __pte(0); }
1750
1751 static int sun4c_pmd_bad(pmd_t pmd)
1752 {
1753         return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) ||
1754                 (!virt_addr_valid(pmd_val(pmd))));
1755 }
1756
1757 static int sun4c_pmd_present(pmd_t pmd)
1758 {
1759         return ((pmd_val(pmd) & PGD_PRESENT) != 0);
1760 }
1761
1762 #if 0 /* if PMD takes one word */
1763 static void sun4c_pmd_clear(pmd_t *pmdp)        { *pmdp = __pmd(0); }
1764 #else /* if pmd_t is a longish aggregate */
1765 static void sun4c_pmd_clear(pmd_t *pmdp) {
1766         memset((void *)pmdp, 0, sizeof(pmd_t));
1767 }
1768 #endif
1769
1770 static int sun4c_pgd_none(pgd_t pgd)            { return 0; }
1771 static int sun4c_pgd_bad(pgd_t pgd)             { return 0; }
1772 static int sun4c_pgd_present(pgd_t pgd)         { return 1; }
1773 static void sun4c_pgd_clear(pgd_t * pgdp)       { }
1774
1775 /*
1776  * The following only work if pte_present() is true.
1777  * Undefined behaviour if not..
1778  */
1779 static pte_t sun4c_pte_mkwrite(pte_t pte)
1780 {
1781         pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE);
1782         if (pte_val(pte) & _SUN4C_PAGE_MODIFIED)
1783                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1784         return pte;
1785 }
1786
1787 static pte_t sun4c_pte_mkdirty(pte_t pte)
1788 {
1789         pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED);
1790         if (pte_val(pte) & _SUN4C_PAGE_WRITE)
1791                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1792         return pte;
1793 }
1794
1795 static pte_t sun4c_pte_mkyoung(pte_t pte)
1796 {
1797         pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED);
1798         if (pte_val(pte) & _SUN4C_PAGE_READ)
1799                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ);
1800         return pte;
1801 }
1802
1803 /*
1804  * Conversion functions: convert a page and protection to a page entry,
1805  * and a page entry and page directory to the page they refer to.
1806  */
1807 static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot)
1808 {
1809         return __pte(page_to_pfn(page) | pgprot_val(pgprot));
1810 }
1811
1812 static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot)
1813 {
1814         return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot));
1815 }
1816
1817 static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
1818 {
1819         return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot));
1820 }
1821
1822 static unsigned long sun4c_pte_pfn(pte_t pte)
1823 {
1824         return pte_val(pte) & SUN4C_PFN_MASK;
1825 }
1826
1827 static pte_t sun4c_pgoff_to_pte(unsigned long pgoff)
1828 {
1829         return __pte(pgoff | _SUN4C_PAGE_FILE);
1830 }
1831
1832 static unsigned long sun4c_pte_to_pgoff(pte_t pte)
1833 {
1834         return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1);
1835 }
1836
1837
1838 static inline unsigned long sun4c_pmd_page_v(pmd_t pmd)
1839 {
1840         return (pmd_val(pmd) & PAGE_MASK);
1841 }
1842
1843 static struct page *sun4c_pmd_page(pmd_t pmd)
1844 {
1845         return virt_to_page(sun4c_pmd_page_v(pmd));
1846 }
1847
1848 static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; }
1849
1850 /* to find an entry in a page-table-directory */
1851 static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address)
1852 {
1853         return mm->pgd + (address >> SUN4C_PGDIR_SHIFT);
1854 }
1855
1856 /* Find an entry in the second-level page table.. */
1857 static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address)
1858 {
1859         return (pmd_t *) dir;
1860 }
1861
1862 /* Find an entry in the third-level page table.. */ 
1863 pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address)
1864 {
1865         return (pte_t *) sun4c_pmd_page_v(*dir) +
1866                         ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1));
1867 }
1868
1869 static unsigned long sun4c_swp_type(swp_entry_t entry)
1870 {
1871         return (entry.val & SUN4C_SWP_TYPE_MASK);
1872 }
1873
1874 static unsigned long sun4c_swp_offset(swp_entry_t entry)
1875 {
1876         return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK;
1877 }
1878
1879 static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset)
1880 {
1881         return (swp_entry_t) {
1882                   (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT
1883                 | (type & SUN4C_SWP_TYPE_MASK) };
1884 }
1885
1886 static void sun4c_free_pte_slow(pte_t *pte)
1887 {
1888         free_page((unsigned long)pte);
1889 }
1890
1891 static void sun4c_free_pgd_slow(pgd_t *pgd)
1892 {
1893         free_page((unsigned long)pgd);
1894 }
1895
1896 static pgd_t *sun4c_get_pgd_fast(void)
1897 {
1898         unsigned long *ret;
1899
1900         if ((ret = pgd_quicklist) != NULL) {
1901                 pgd_quicklist = (unsigned long *)(*ret);
1902                 ret[0] = ret[1];
1903                 pgtable_cache_size--;
1904         } else {
1905                 pgd_t *init;
1906                 
1907                 ret = (unsigned long *)__get_free_page(GFP_KERNEL);
1908                 memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t));
1909                 init = sun4c_pgd_offset(&init_mm, 0);
1910                 memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
1911                         (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
1912         }
1913         return (pgd_t *)ret;
1914 }
1915
1916 static void sun4c_free_pgd_fast(pgd_t *pgd)
1917 {
1918         *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
1919         pgd_quicklist = (unsigned long *) pgd;
1920         pgtable_cache_size++;
1921 }
1922
1923
1924 static inline pte_t *
1925 sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
1926 {
1927         unsigned long *ret;
1928
1929         if ((ret = (unsigned long *)pte_quicklist) != NULL) {
1930                 pte_quicklist = (unsigned long *)(*ret);
1931                 ret[0] = ret[1];
1932                 pgtable_cache_size--;
1933         }
1934         return (pte_t *)ret;
1935 }
1936
1937 static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
1938 {
1939         pte_t *pte;
1940
1941         if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL)
1942                 return pte;
1943
1944         pte = (pte_t *)get_zeroed_page(GFP_KERNEL|__GFP_REPEAT);
1945         return pte;
1946 }
1947
1948 static pgtable_t sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
1949 {
1950         pte_t *pte;
1951         struct page *page;
1952
1953         pte = sun4c_pte_alloc_one_kernel(mm, address);
1954         if (pte == NULL)
1955                 return NULL;
1956         page = virt_to_page(pte);
1957         pgtable_page_ctor(page);
1958         return page;
1959 }
1960
1961 static inline void sun4c_free_pte_fast(pte_t *pte)
1962 {
1963         *(unsigned long *)pte = (unsigned long) pte_quicklist;
1964         pte_quicklist = (unsigned long *) pte;
1965         pgtable_cache_size++;
1966 }
1967
1968 static void sun4c_pte_free(pgtable_t pte)
1969 {
1970         pgtable_page_dtor(pte);
1971         sun4c_free_pte_fast(page_address(pte));
1972 }
1973
1974 /*
1975  * allocating and freeing a pmd is trivial: the 1-entry pmd is
1976  * inside the pgd, so has no extra memory associated with it.
1977  */
1978 static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address)
1979 {
1980         BUG();
1981         return NULL;
1982 }
1983
1984 static void sun4c_free_pmd_fast(pmd_t * pmd) { }
1985
1986 static void sun4c_check_pgt_cache(int low, int high)
1987 {
1988         if (pgtable_cache_size > high) {
1989                 do {
1990                         if (pgd_quicklist)
1991                                 sun4c_free_pgd_slow(sun4c_get_pgd_fast());
1992                         if (pte_quicklist)
1993                                 sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0));
1994                 } while (pgtable_cache_size > low);
1995         }
1996 }
1997
1998 /* An experiment, turn off by default for now... -DaveM */
1999 #define SUN4C_PRELOAD_PSEG
2000
2001 void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
2002 {
2003         unsigned long flags;
2004         int pseg;
2005
2006         if (vma->vm_mm->context == NO_CONTEXT)
2007                 return;
2008
2009         local_irq_save(flags);
2010         address &= PAGE_MASK;
2011         if ((pseg = sun4c_get_segmap(address)) == invalid_segment) {
2012                 struct sun4c_mmu_entry *entry = sun4c_user_strategy();
2013                 struct mm_struct *mm = vma->vm_mm;
2014                 unsigned long start, end;
2015
2016                 entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK);
2017                 entry->ctx = mm->context;
2018                 add_ring_ordered(sun4c_context_ring + mm->context, entry);
2019                 sun4c_put_segmap(entry->vaddr, entry->pseg);
2020                 end = start + SUN4C_REAL_PGDIR_SIZE;
2021                 while (start < end) {
2022 #ifdef SUN4C_PRELOAD_PSEG
2023                         pgd_t *pgdp = sun4c_pgd_offset(mm, start);
2024                         pte_t *ptep;
2025
2026                         if (!pgdp)
2027                                 goto no_mapping;
2028                         ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start);
2029                         if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT))
2030                                 goto no_mapping;
2031                         sun4c_put_pte(start, pte_val(*ptep));
2032                         goto next;
2033
2034                 no_mapping:
2035 #endif
2036                         sun4c_put_pte(start, 0);
2037 #ifdef SUN4C_PRELOAD_PSEG
2038                 next:
2039 #endif
2040                         start += PAGE_SIZE;
2041                 }
2042 #ifndef SUN4C_PRELOAD_PSEG
2043                 sun4c_put_pte(address, pte_val(pte));
2044 #endif
2045                 local_irq_restore(flags);
2046                 return;
2047         } else {
2048                 struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg];
2049
2050                 remove_lru(entry);
2051                 add_lru(entry);
2052         }
2053
2054         sun4c_put_pte(address, pte_val(pte));
2055         local_irq_restore(flags);
2056 }
2057
2058 extern void sparc_context_init(int);
2059 extern unsigned long end;
2060 extern unsigned long bootmem_init(unsigned long *pages_avail);
2061 extern unsigned long last_valid_pfn;
2062
2063 void __init sun4c_paging_init(void)
2064 {
2065         int i, cnt;
2066         unsigned long kernel_end, vaddr;
2067         extern struct resource sparc_iomap;
2068         unsigned long end_pfn, pages_avail;
2069
2070         kernel_end = (unsigned long) &end;
2071         kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
2072
2073         pages_avail = 0;
2074         last_valid_pfn = bootmem_init(&pages_avail);
2075         end_pfn = last_valid_pfn;
2076
2077         sun4c_probe_mmu();
2078         invalid_segment = (num_segmaps - 1);
2079         sun4c_init_mmu_entry_pool();
2080         sun4c_init_rings();
2081         sun4c_init_map_kernelprom(kernel_end);
2082         sun4c_init_clean_mmu(kernel_end);
2083         sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS);
2084         sun4c_init_lock_area(sparc_iomap.start, IOBASE_END);
2085         sun4c_init_lock_area(DVMA_VADDR, DVMA_END);
2086         sun4c_init_lock_areas();
2087         sun4c_init_fill_user_ring();
2088
2089         sun4c_set_context(0);
2090         memset(swapper_pg_dir, 0, PAGE_SIZE);
2091         memset(pg0, 0, PAGE_SIZE);
2092         memset(pg1, 0, PAGE_SIZE);
2093         memset(pg2, 0, PAGE_SIZE);
2094         memset(pg3, 0, PAGE_SIZE);
2095
2096         /* Save work later. */
2097         vaddr = VMALLOC_START;
2098         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0);
2099         vaddr += SUN4C_PGDIR_SIZE;
2100         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1);
2101         vaddr += SUN4C_PGDIR_SIZE;
2102         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2);
2103         vaddr += SUN4C_PGDIR_SIZE;
2104         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3);
2105         sun4c_init_ss2_cache_bug();
2106         sparc_context_init(num_contexts);
2107
2108         {
2109                 unsigned long zones_size[MAX_NR_ZONES];
2110                 unsigned long zholes_size[MAX_NR_ZONES];
2111                 unsigned long npages;
2112                 int znum;
2113
2114                 for (znum = 0; znum < MAX_NR_ZONES; znum++)
2115                         zones_size[znum] = zholes_size[znum] = 0;
2116
2117                 npages = max_low_pfn - pfn_base;
2118
2119                 zones_size[ZONE_DMA] = npages;
2120                 zholes_size[ZONE_DMA] = npages - pages_avail;
2121
2122                 npages = highend_pfn - max_low_pfn;
2123                 zones_size[ZONE_HIGHMEM] = npages;
2124                 zholes_size[ZONE_HIGHMEM] = npages - calc_highpages();
2125
2126                 free_area_init_node(0, zones_size, pfn_base, zholes_size);
2127         }
2128
2129         cnt = 0;
2130         for (i = 0; i < num_segmaps; i++)
2131                 if (mmu_entry_pool[i].locked)
2132                         cnt++;
2133
2134         max_user_taken_entries = num_segmaps - cnt - 40 - 1;
2135
2136         printk("SUN4C: %d mmu entries for the kernel\n", cnt);
2137 }
2138
2139 static pgprot_t sun4c_pgprot_noncached(pgprot_t prot)
2140 {
2141         prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE);
2142
2143         return prot;
2144 }
2145
2146 /* Load up routines and constants for sun4c mmu */
2147 void __init ld_mmu_sun4c(void)
2148 {
2149         extern void ___xchg32_sun4c(void);
2150         
2151         printk("Loading sun4c MMU routines\n");
2152
2153         /* First the constants */
2154         BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT);
2155         BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE);
2156         BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK);
2157
2158         BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD);
2159         BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD);
2160         BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE);
2161
2162         BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE));
2163         PAGE_SHARED = pgprot_val(SUN4C_PAGE_SHARED);
2164         BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY));
2165         BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY));
2166         BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL));
2167         page_kernel = pgprot_val(SUN4C_PAGE_KERNEL);
2168
2169         /* Functions */
2170         BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM);
2171         BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
2172         BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);
2173         
2174         BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM);
2175
2176         if (sun4c_vacinfo.do_hwflushes) {
2177                 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM);
2178                 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM);
2179                 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM);
2180         } else {
2181                 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM);
2182                 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM);
2183                 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM);
2184         }
2185
2186         BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM);
2187         BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM);
2188         BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM);
2189         BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM);
2190         BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM);
2191         BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM);
2192         BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM);
2193         BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM);
2194         BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM);
2195         BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM);
2196
2197         BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP);
2198
2199         BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0);
2200
2201         /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */
2202         /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */  /* Defaults to zero? */
2203
2204         BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM);
2205 #if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */
2206         BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1));
2207 #else
2208         BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM);
2209 #endif
2210         BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM);
2211         BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM);
2212
2213         BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM);
2214         BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0);
2215
2216         BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM);
2217         BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM);
2218         BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0);
2219
2220         BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0));
2221         BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0));
2222         BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1));
2223         BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP);
2224
2225         BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM);
2226         BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM);
2227         BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM);
2228
2229         BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK);
2230         BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM);
2231         BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM);
2232         BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM);
2233         BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM);
2234         BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM);
2235         BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM);
2236         BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP);
2237         BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0);
2238         BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM);
2239         BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM);
2240
2241         BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE);
2242         BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED);
2243         BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED);
2244         BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE);
2245         BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE);
2246         BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE);
2247         BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ);
2248         BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM);
2249         BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM);
2250         BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM);
2251         BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM);
2252
2253         BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM);
2254         BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM);
2255
2256         BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM);
2257         BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM);
2258
2259         BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM);
2260         BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM);
2261         BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM);
2262         BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM);
2263
2264         BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM);
2265         BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM);
2266         BTFIXUPSET_CALL(mmu_translate_dvma, sun4c_translate_dvma, BTFIXUPCALL_NORM);
2267
2268         BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM);
2269         BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM);
2270
2271         BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM);
2272         BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM);
2273         BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM);
2274
2275         BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM);
2276         BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM);
2277
2278         BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM);
2279
2280         /* These should _never_ get called with two level tables. */
2281         BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP);
2282         BTFIXUPSET_CALL(pgd_page_vaddr, sun4c_pgd_page, BTFIXUPCALL_RETO0);
2283 }