[SPARC32]: __inline__ --> inline
[linux-2.6.git] / arch / sparc / mm / btfixup.c
1 /* btfixup.c: Boot time code fixup and relocator, so that
2  * we can get rid of most indirect calls to achieve single
3  * image sun4c and srmmu kernel.
4  *
5  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
6  */
7
8 #include <linux/kernel.h>
9 #include <linux/init.h>
10 #include <asm/btfixup.h>
11 #include <asm/page.h>
12 #include <asm/pgalloc.h>
13 #include <asm/pgtable.h>
14 #include <asm/oplib.h>
15 #include <asm/system.h>
16 #include <asm/cacheflush.h>
17
18 #define BTFIXUP_OPTIMIZE_NOP
19 #define BTFIXUP_OPTIMIZE_OTHER
20
21 extern char *srmmu_name;
22 static char version[] __initdata = "Boot time fixup v1.6. 4/Mar/98 Jakub Jelinek (jj@ultra.linux.cz). Patching kernel for ";
23 #ifdef CONFIG_SUN4
24 static char str_sun4c[] __initdata = "sun4\n";
25 #else
26 static char str_sun4c[] __initdata = "sun4c\n";
27 #endif
28 static char str_srmmu[] __initdata = "srmmu[%s]/";
29 static char str_iommu[] __initdata = "iommu\n";
30 static char str_iounit[] __initdata = "io-unit\n";
31
32 static int visited __initdata = 0;
33 extern unsigned int ___btfixup_start[], ___btfixup_end[], __init_begin[], __init_end[], __init_text_end[];
34 extern unsigned int _stext[], _end[], __start___ksymtab[], __stop___ksymtab[];
35 static char wrong_f[] __initdata = "Trying to set f fixup %p to invalid function %08x\n";
36 static char wrong_b[] __initdata = "Trying to set b fixup %p to invalid function %08x\n";
37 static char wrong_s[] __initdata = "Trying to set s fixup %p to invalid value %08x\n";
38 static char wrong_h[] __initdata = "Trying to set h fixup %p to invalid value %08x\n";
39 static char wrong_a[] __initdata = "Trying to set a fixup %p to invalid value %08x\n";
40 static char wrong[] __initdata = "Wrong address for %c fixup %p\n";
41 static char insn_f[] __initdata = "Fixup f %p refers to weird instructions at %p[%08x,%08x]\n";
42 static char insn_b[] __initdata = "Fixup b %p doesn't refer to a SETHI at %p[%08x]\n";
43 static char insn_s[] __initdata = "Fixup s %p doesn't refer to an OR at %p[%08x]\n";
44 static char insn_h[] __initdata = "Fixup h %p doesn't refer to a SETHI at %p[%08x]\n";
45 static char insn_a[] __initdata = "Fixup a %p doesn't refer to a SETHI nor OR at %p[%08x]\n";
46 static char insn_i[] __initdata = "Fixup i %p doesn't refer to a valid instruction at %p[%08x]\n";
47 static char fca_und[] __initdata = "flush_cache_all undefined in btfixup()\n";
48 static char wrong_setaddr[] __initdata = "Garbled CALL/INT patch at %p[%08x,%08x,%08x]=%08x\n";
49
50 #ifdef BTFIXUP_OPTIMIZE_OTHER
51 static void __init set_addr(unsigned int *addr, unsigned int q1, int fmangled, unsigned int value)
52 {
53         if (!fmangled)
54                 *addr = value;
55         else {
56                 unsigned int *q = (unsigned int *)q1;
57                 if (*addr == 0x01000000) {
58                         /* Noped */
59                         *q = value;
60                 } else if (addr[-1] == *q) {
61                         /* Moved */
62                         addr[-1] = value;
63                         *q = value;
64                 } else {
65                         prom_printf(wrong_setaddr, addr-1, addr[-1], *addr, *q, value);
66                         prom_halt();
67                 }
68         }
69 }
70 #else
71 static inline void set_addr(unsigned int *addr, unsigned int q1, int fmangled, unsigned int value)
72 {
73         *addr = value;
74 }
75 #endif
76
77 void __init btfixup(void)
78 {
79         unsigned int *p, *q;
80         int type, count;
81         unsigned insn;
82         unsigned *addr;
83         int fmangled = 0;
84         void (*flush_cacheall)(void);
85         
86         if (!visited) {
87                 visited++;
88                 printk(version);
89                 if (ARCH_SUN4C_SUN4)
90                         printk(str_sun4c);
91                 else {
92                         printk(str_srmmu, srmmu_name);
93                         if (sparc_cpu_model == sun4d)
94                                 printk(str_iounit);
95                         else
96                                 printk(str_iommu);
97                 }
98         }
99         for (p = ___btfixup_start; p < ___btfixup_end; ) {
100                 count = p[2];
101                 q = p + 3;
102                 switch (type = *(unsigned char *)p) {
103                 case 'f': 
104                         count = p[3];
105                         q = p + 4;
106                         if (((p[0] & 1) || p[1]) 
107                             && ((p[1] & 3) || (unsigned *)(p[1]) < _stext || (unsigned *)(p[1]) >= _end)) {
108                                 prom_printf(wrong_f, p, p[1]);
109                                 prom_halt();
110                         }
111                         break;
112                 case 'b':
113                         if (p[1] < (unsigned long)__init_begin || p[1] >= (unsigned long)__init_text_end || (p[1] & 3)) {
114                                 prom_printf(wrong_b, p, p[1]);
115                                 prom_halt();
116                         }
117                         break;
118                 case 's':
119                         if (p[1] + 0x1000 >= 0x2000) {
120                                 prom_printf(wrong_s, p, p[1]);
121                                 prom_halt();
122                         }
123                         break;
124                 case 'h':
125                         if (p[1] & 0x3ff) {
126                                 prom_printf(wrong_h, p, p[1]);
127                                 prom_halt();
128                         }
129                         break;
130                 case 'a':
131                         if (p[1] + 0x1000 >= 0x2000 && (p[1] & 0x3ff)) {
132                                 prom_printf(wrong_a, p, p[1]);
133                                 prom_halt();
134                         }
135                         break;
136                 }
137                 if (p[0] & 1) {
138                         p[0] &= ~1;
139                         while (count) {
140                                 fmangled = 0;
141                                 addr = (unsigned *)*q;
142                                 if (addr < _stext || addr >= _end) {
143                                         prom_printf(wrong, type, p);
144                                         prom_halt();
145                                 }
146                                 insn = *addr;
147 #ifdef BTFIXUP_OPTIMIZE_OTHER                           
148                                 if (type != 'f' && q[1]) {
149                                         insn = *(unsigned int *)q[1];
150                                         if (!insn || insn == 1)
151                                                 insn = *addr;
152                                         else
153                                                 fmangled = 1;
154                                 }
155 #endif
156                                 switch (type) {
157                                 case 'f':       /* CALL */
158                                         if (addr >= __start___ksymtab && addr < __stop___ksymtab) {
159                                                 *addr = p[1];
160                                                 break;
161                                         } else if (!q[1]) {
162                                                 if ((insn & 0xc1c00000) == 0x01000000) { /* SETHI */
163                                                         *addr = (insn & 0xffc00000) | (p[1] >> 10); break;
164                                                 } else if ((insn & 0xc1f82000) == 0x80102000) { /* OR X, %LO(i), Y */
165                                                         *addr = (insn & 0xffffe000) | (p[1] & 0x3ff); break;
166                                                 } else if ((insn & 0xc0000000) != 0x40000000) { /* !CALL */
167                                 bad_f:
168                                                         prom_printf(insn_f, p, addr, insn, addr[1]);
169                                                         prom_halt();
170                                                 }
171                                         } else if (q[1] != 1)
172                                                 addr[1] = q[1];
173                                         if (p[2] == BTFIXUPCALL_NORM) {
174                                 norm_f: 
175                                                 *addr = 0x40000000 | ((p[1] - (unsigned)addr) >> 2);
176                                                 q[1] = 0;
177                                                 break;
178                                         }
179 #ifndef BTFIXUP_OPTIMIZE_NOP
180                                         goto norm_f;
181 #else
182                                         if (!(addr[1] & 0x80000000)) {
183                                                 if ((addr[1] & 0xc1c00000) != 0x01000000)       /* !SETHI */
184                                                         goto bad_f; /* CALL, Bicc, FBfcc, CBccc are weird in delay slot, aren't they? */
185                                         } else {
186                                                 if ((addr[1] & 0x01800000) == 0x01800000) {
187                                                         if ((addr[1] & 0x01f80000) == 0x01e80000) {
188                                                                 /* RESTORE */
189                                                                 goto norm_f; /* It is dangerous to patch that */
190                                                         }
191                                                         goto bad_f;
192                                                 }
193                                                 if ((addr[1] & 0xffffe003) == 0x9e03e000) {
194                                                         /* ADD %O7, XX, %o7 */
195                                                         int displac = (addr[1] << 19);
196                                                         
197                                                         displac = (displac >> 21) + 2;
198                                                         *addr = (0x10800000) + (displac & 0x3fffff);
199                                                         q[1] = addr[1];
200                                                         addr[1] = p[2];
201                                                         break;
202                                                 }
203                                                 if ((addr[1] & 0x201f) == 0x200f || (addr[1] & 0x7c000) == 0x3c000)
204                                                         goto norm_f; /* Someone is playing bad tricks with us: rs1 or rs2 is o7 */
205                                                 if ((addr[1] & 0x3e000000) == 0x1e000000)
206                                                         goto norm_f; /* rd is %o7. We'd better take care. */
207                                         }
208                                         if (p[2] == BTFIXUPCALL_NOP) {
209                                                 *addr = 0x01000000;
210                                                 q[1] = 1;
211                                                 break;
212                                         }
213 #ifndef BTFIXUP_OPTIMIZE_OTHER
214                                         goto norm_f;
215 #else
216                                         if (addr[1] == 0x01000000) {    /* NOP in the delay slot */
217                                                 q[1] = addr[1];
218                                                 *addr = p[2];
219                                                 break;
220                                         }
221                                         if ((addr[1] & 0xc0000000) != 0xc0000000) {
222                                                 /* Not a memory operation */
223                                                 if ((addr[1] & 0x30000000) == 0x10000000) {
224                                                         /* Ok, non-memory op with rd %oX */
225                                                         if ((addr[1] & 0x3e000000) == 0x1c000000)
226                                                                 goto bad_f; /* Aiee. Someone is playing strange %sp tricks */
227                                                         if ((addr[1] & 0x3e000000) > 0x12000000 ||
228                                                             ((addr[1] & 0x3e000000) == 0x12000000 &&
229                                                              p[2] != BTFIXUPCALL_STO1O0 && p[2] != BTFIXUPCALL_SWAPO0O1) ||
230                                                             ((p[2] & 0xffffe000) == BTFIXUPCALL_RETINT(0))) {
231                                                                 /* Nobody uses the result. We can nop it out. */
232                                                                 *addr = p[2];
233                                                                 q[1] = addr[1];
234                                                                 addr[1] = 0x01000000;
235                                                                 break;
236                                                         }
237                                                         if ((addr[1] & 0xf1ffffe0) == 0x90100000) {
238                                                                 /* MOV %reg, %Ox */
239                                                                 if ((addr[1] & 0x3e000000) == 0x10000000 &&
240                                                                     (p[2] & 0x7c000) == 0x20000) {
241                                                                         /* Ok, it is call xx; mov reg, %o0 and call optimizes
242                                                                            to doing something on %o0. Patch the patch. */
243                                                                         *addr = (p[2] & ~0x7c000) | ((addr[1] & 0x1f) << 14);
244                                                                         q[1] = addr[1];
245                                                                         addr[1] = 0x01000000;
246                                                                         break;
247                                                                 }
248                                                                 if ((addr[1] & 0x3e000000) == 0x12000000 &&
249                                                                     p[2] == BTFIXUPCALL_STO1O0) {
250                                                                         *addr = (p[2] & ~0x3e000000) | ((addr[1] & 0x1f) << 25);
251                                                                         q[1] = addr[1];
252                                                                         addr[1] = 0x01000000;
253                                                                         break;
254                                                                 }
255                                                         }
256                                                 }
257                                         }
258                                         *addr = addr[1];
259                                         q[1] = addr[1];
260                                         addr[1] = p[2];
261                                         break;
262 #endif /* BTFIXUP_OPTIMIZE_OTHER */
263 #endif /* BTFIXUP_OPTIMIZE_NOP */
264                                 case 'b':       /* BLACKBOX */
265                                         /* Has to be sethi i, xx */
266                                         if ((insn & 0xc1c00000) != 0x01000000) {
267                                                 prom_printf(insn_b, p, addr, insn);
268                                                 prom_halt();
269                                         } else {
270                                                 void (*do_fixup)(unsigned *);
271                                                 
272                                                 do_fixup = (void (*)(unsigned *))p[1];
273                                                 do_fixup(addr);
274                                         }
275                                         break;
276                                 case 's':       /* SIMM13 */
277                                         /* Has to be or %g0, i, xx */
278                                         if ((insn & 0xc1ffe000) != 0x80102000) {
279                                                 prom_printf(insn_s, p, addr, insn);
280                                                 prom_halt();
281                                         }
282                                         set_addr(addr, q[1], fmangled, (insn & 0xffffe000) | (p[1] & 0x1fff));
283                                         break;
284                                 case 'h':       /* SETHI */
285                                         /* Has to be sethi i, xx */
286                                         if ((insn & 0xc1c00000) != 0x01000000) {
287                                                 prom_printf(insn_h, p, addr, insn);
288                                                 prom_halt();
289                                         }
290                                         set_addr(addr, q[1], fmangled, (insn & 0xffc00000) | (p[1] >> 10));
291                                         break;
292                                 case 'a':       /* HALF */
293                                         /* Has to be sethi i, xx or or %g0, i, xx */
294                                         if ((insn & 0xc1c00000) != 0x01000000 &&
295                                             (insn & 0xc1ffe000) != 0x80102000) {
296                                                 prom_printf(insn_a, p, addr, insn);
297                                                 prom_halt();
298                                         }
299                                         if (p[1] & 0x3ff)
300                                                 set_addr(addr, q[1], fmangled, 
301                                                         (insn & 0x3e000000) | 0x80102000 | (p[1] & 0x1fff));
302                                         else
303                                                 set_addr(addr, q[1], fmangled, 
304                                                         (insn & 0x3e000000) | 0x01000000 | (p[1] >> 10));
305                                         break;
306                                 case 'i':       /* INT */
307                                         if ((insn & 0xc1c00000) == 0x01000000) /* %HI */
308                                                 set_addr(addr, q[1], fmangled, (insn & 0xffc00000) | (p[1] >> 10));
309                                         else if ((insn & 0x80002000) == 0x80002000 &&
310                                                  (insn & 0x01800000) != 0x01800000) /* %LO */
311                                                 set_addr(addr, q[1], fmangled, (insn & 0xffffe000) | (p[1] & 0x3ff));
312                                         else {
313                                                 prom_printf(insn_i, p, addr, insn);
314                                                 prom_halt();
315                                         }
316                                         break;
317                                 }
318                                 count -= 2;
319                                 q += 2;
320                         }
321                 } else
322                         p = q + count;
323         }
324 #ifdef CONFIG_SMP
325         flush_cacheall = (void (*)(void))BTFIXUPVAL_CALL(local_flush_cache_all);
326 #else
327         flush_cacheall = (void (*)(void))BTFIXUPVAL_CALL(flush_cache_all);
328 #endif
329         if (!flush_cacheall) {
330                 prom_printf(fca_und);
331                 prom_halt();
332         }
333         (*flush_cacheall)();
334 }