mm: arch: rename in_gate_area_no_task to in_gate_area_no_mm
[linux-2.6.git] / arch / powerpc / kernel / vdso.c
1
2 /*
3  *    Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
4  *                       <benh@kernel.crashing.org>
5  *
6  *  This program is free software; you can redistribute it and/or
7  *  modify it under the terms of the GNU General Public License
8  *  as published by the Free Software Foundation; either version
9  *  2 of the License, or (at your option) any later version.
10  */
11
12 #include <linux/module.h>
13 #include <linux/errno.h>
14 #include <linux/sched.h>
15 #include <linux/kernel.h>
16 #include <linux/mm.h>
17 #include <linux/smp.h>
18 #include <linux/stddef.h>
19 #include <linux/unistd.h>
20 #include <linux/slab.h>
21 #include <linux/user.h>
22 #include <linux/elf.h>
23 #include <linux/security.h>
24 #include <linux/bootmem.h>
25 #include <linux/memblock.h>
26
27 #include <asm/pgtable.h>
28 #include <asm/system.h>
29 #include <asm/processor.h>
30 #include <asm/mmu.h>
31 #include <asm/mmu_context.h>
32 #include <asm/prom.h>
33 #include <asm/machdep.h>
34 #include <asm/cputable.h>
35 #include <asm/sections.h>
36 #include <asm/firmware.h>
37 #include <asm/vdso.h>
38 #include <asm/vdso_datapage.h>
39
40 #include "setup.h"
41
42 #undef DEBUG
43
44 #ifdef DEBUG
45 #define DBG(fmt...) printk(fmt)
46 #else
47 #define DBG(fmt...)
48 #endif
49
50 /* Max supported size for symbol names */
51 #define MAX_SYMNAME     64
52
53 /* The alignment of the vDSO */
54 #define VDSO_ALIGNMENT  (1 << 16)
55
56 extern char vdso32_start, vdso32_end;
57 static void *vdso32_kbase = &vdso32_start;
58 static unsigned int vdso32_pages;
59 static struct page **vdso32_pagelist;
60 unsigned long vdso32_sigtramp;
61 unsigned long vdso32_rt_sigtramp;
62
63 #ifdef CONFIG_PPC64
64 extern char vdso64_start, vdso64_end;
65 static void *vdso64_kbase = &vdso64_start;
66 static unsigned int vdso64_pages;
67 static struct page **vdso64_pagelist;
68 unsigned long vdso64_rt_sigtramp;
69 #endif /* CONFIG_PPC64 */
70
71 static int vdso_ready;
72
73 /*
74  * The vdso data page (aka. systemcfg for old ppc64 fans) is here.
75  * Once the early boot kernel code no longer needs to muck around
76  * with it, it will become dynamically allocated
77  */
78 static union {
79         struct vdso_data        data;
80         u8                      page[PAGE_SIZE];
81 } vdso_data_store __page_aligned_data;
82 struct vdso_data *vdso_data = &vdso_data_store.data;
83
84 /* Format of the patch table */
85 struct vdso_patch_def
86 {
87         unsigned long   ftr_mask, ftr_value;
88         const char      *gen_name;
89         const char      *fix_name;
90 };
91
92 /* Table of functions to patch based on the CPU type/revision
93  *
94  * Currently, we only change sync_dicache to do nothing on processors
95  * with a coherent icache
96  */
97 static struct vdso_patch_def vdso_patches[] = {
98         {
99                 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
100                 "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
101         },
102         {
103                 CPU_FTR_USE_TB, 0,
104                 "__kernel_gettimeofday", NULL
105         },
106         {
107                 CPU_FTR_USE_TB, 0,
108                 "__kernel_clock_gettime", NULL
109         },
110         {
111                 CPU_FTR_USE_TB, 0,
112                 "__kernel_clock_getres", NULL
113         },
114         {
115                 CPU_FTR_USE_TB, 0,
116                 "__kernel_get_tbfreq", NULL
117         },
118 };
119
120 /*
121  * Some infos carried around for each of them during parsing at
122  * boot time.
123  */
124 struct lib32_elfinfo
125 {
126         Elf32_Ehdr      *hdr;           /* ptr to ELF */
127         Elf32_Sym       *dynsym;        /* ptr to .dynsym section */
128         unsigned long   dynsymsize;     /* size of .dynsym section */
129         char            *dynstr;        /* ptr to .dynstr section */
130         unsigned long   text;           /* offset of .text section in .so */
131 };
132
133 struct lib64_elfinfo
134 {
135         Elf64_Ehdr      *hdr;
136         Elf64_Sym       *dynsym;
137         unsigned long   dynsymsize;
138         char            *dynstr;
139         unsigned long   text;
140 };
141
142
143 #ifdef __DEBUG
144 static void dump_one_vdso_page(struct page *pg, struct page *upg)
145 {
146         printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT),
147                page_count(pg),
148                pg->flags);
149         if (upg && !IS_ERR(upg) /* && pg != upg*/) {
150                 printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg)
151                                                        << PAGE_SHIFT),
152                        page_count(upg),
153                        upg->flags);
154         }
155         printk("\n");
156 }
157
158 static void dump_vdso_pages(struct vm_area_struct * vma)
159 {
160         int i;
161
162         if (!vma || is_32bit_task()) {
163                 printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase);
164                 for (i=0; i<vdso32_pages; i++) {
165                         struct page *pg = virt_to_page(vdso32_kbase +
166                                                        i*PAGE_SIZE);
167                         struct page *upg = (vma && vma->vm_mm) ?
168                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
169                                 : NULL;
170                         dump_one_vdso_page(pg, upg);
171                 }
172         }
173         if (!vma || !is_32bit_task()) {
174                 printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase);
175                 for (i=0; i<vdso64_pages; i++) {
176                         struct page *pg = virt_to_page(vdso64_kbase +
177                                                        i*PAGE_SIZE);
178                         struct page *upg = (vma && vma->vm_mm) ?
179                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
180                                 : NULL;
181                         dump_one_vdso_page(pg, upg);
182                 }
183         }
184 }
185 #endif /* DEBUG */
186
187 /*
188  * This is called from binfmt_elf, we create the special vma for the
189  * vDSO and insert it into the mm struct tree
190  */
191 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
192 {
193         struct mm_struct *mm = current->mm;
194         struct page **vdso_pagelist;
195         unsigned long vdso_pages;
196         unsigned long vdso_base;
197         int rc;
198
199         if (!vdso_ready)
200                 return 0;
201
202 #ifdef CONFIG_PPC64
203         if (is_32bit_task()) {
204                 vdso_pagelist = vdso32_pagelist;
205                 vdso_pages = vdso32_pages;
206                 vdso_base = VDSO32_MBASE;
207         } else {
208                 vdso_pagelist = vdso64_pagelist;
209                 vdso_pages = vdso64_pages;
210                 /*
211                  * On 64bit we don't have a preferred map address. This
212                  * allows get_unmapped_area to find an area near other mmaps
213                  * and most likely share a SLB entry.
214                  */
215                 vdso_base = 0;
216         }
217 #else
218         vdso_pagelist = vdso32_pagelist;
219         vdso_pages = vdso32_pages;
220         vdso_base = VDSO32_MBASE;
221 #endif
222
223         current->mm->context.vdso_base = 0;
224
225         /* vDSO has a problem and was disabled, just don't "enable" it for the
226          * process
227          */
228         if (vdso_pages == 0)
229                 return 0;
230         /* Add a page to the vdso size for the data page */
231         vdso_pages ++;
232
233         /*
234          * pick a base address for the vDSO in process space. We try to put it
235          * at vdso_base which is the "natural" base for it, but we might fail
236          * and end up putting it elsewhere.
237          * Add enough to the size so that the result can be aligned.
238          */
239         down_write(&mm->mmap_sem);
240         vdso_base = get_unmapped_area(NULL, vdso_base,
241                                       (vdso_pages << PAGE_SHIFT) +
242                                       ((VDSO_ALIGNMENT - 1) & PAGE_MASK),
243                                       0, 0);
244         if (IS_ERR_VALUE(vdso_base)) {
245                 rc = vdso_base;
246                 goto fail_mmapsem;
247         }
248
249         /* Add required alignment. */
250         vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT);
251
252         /*
253          * Put vDSO base into mm struct. We need to do this before calling
254          * install_special_mapping or the perf counter mmap tracking code
255          * will fail to recognise it as a vDSO (since arch_vma_name fails).
256          */
257         current->mm->context.vdso_base = vdso_base;
258
259         /*
260          * our vma flags don't have VM_WRITE so by default, the process isn't
261          * allowed to write those pages.
262          * gdb can break that with ptrace interface, and thus trigger COW on
263          * those pages but it's then your responsibility to never do that on
264          * the "data" page of the vDSO or you'll stop getting kernel updates
265          * and your nice userland gettimeofday will be totally dead.
266          * It's fine to use that for setting breakpoints in the vDSO code
267          * pages though
268          *
269          * Make sure the vDSO gets into every core dump.
270          * Dumping its contents makes post-mortem fully interpretable later
271          * without matching up the same kernel and hardware config to see
272          * what PC values meant.
273          */
274         rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
275                                      VM_READ|VM_EXEC|
276                                      VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
277                                      VM_ALWAYSDUMP,
278                                      vdso_pagelist);
279         if (rc) {
280                 current->mm->context.vdso_base = 0;
281                 goto fail_mmapsem;
282         }
283
284         up_write(&mm->mmap_sem);
285         return 0;
286
287  fail_mmapsem:
288         up_write(&mm->mmap_sem);
289         return rc;
290 }
291
292 const char *arch_vma_name(struct vm_area_struct *vma)
293 {
294         if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
295                 return "[vdso]";
296         return NULL;
297 }
298
299
300
301 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
302                                   unsigned long *size)
303 {
304         Elf32_Shdr *sechdrs;
305         unsigned int i;
306         char *secnames;
307
308         /* Grab section headers and strings so we can tell who is who */
309         sechdrs = (void *)ehdr + ehdr->e_shoff;
310         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
311
312         /* Find the section they want */
313         for (i = 1; i < ehdr->e_shnum; i++) {
314                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
315                         if (size)
316                                 *size = sechdrs[i].sh_size;
317                         return (void *)ehdr + sechdrs[i].sh_offset;
318                 }
319         }
320         *size = 0;
321         return NULL;
322 }
323
324 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
325                                         const char *symname)
326 {
327         unsigned int i;
328         char name[MAX_SYMNAME], *c;
329
330         for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
331                 if (lib->dynsym[i].st_name == 0)
332                         continue;
333                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
334                         MAX_SYMNAME);
335                 c = strchr(name, '@');
336                 if (c)
337                         *c = 0;
338                 if (strcmp(symname, name) == 0)
339                         return &lib->dynsym[i];
340         }
341         return NULL;
342 }
343
344 /* Note that we assume the section is .text and the symbol is relative to
345  * the library base
346  */
347 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
348                                             const char *symname)
349 {
350         Elf32_Sym *sym = find_symbol32(lib, symname);
351
352         if (sym == NULL) {
353                 printk(KERN_WARNING "vDSO32: function %s not found !\n",
354                        symname);
355                 return 0;
356         }
357         return sym->st_value - VDSO32_LBASE;
358 }
359
360 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
361                                        struct lib64_elfinfo *v64,
362                                        const char *orig, const char *fix)
363 {
364         Elf32_Sym *sym32_gen, *sym32_fix;
365
366         sym32_gen = find_symbol32(v32, orig);
367         if (sym32_gen == NULL) {
368                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
369                 return -1;
370         }
371         if (fix == NULL) {
372                 sym32_gen->st_name = 0;
373                 return 0;
374         }
375         sym32_fix = find_symbol32(v32, fix);
376         if (sym32_fix == NULL) {
377                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
378                 return -1;
379         }
380         sym32_gen->st_value = sym32_fix->st_value;
381         sym32_gen->st_size = sym32_fix->st_size;
382         sym32_gen->st_info = sym32_fix->st_info;
383         sym32_gen->st_other = sym32_fix->st_other;
384         sym32_gen->st_shndx = sym32_fix->st_shndx;
385
386         return 0;
387 }
388
389
390 #ifdef CONFIG_PPC64
391
392 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
393                                   unsigned long *size)
394 {
395         Elf64_Shdr *sechdrs;
396         unsigned int i;
397         char *secnames;
398
399         /* Grab section headers and strings so we can tell who is who */
400         sechdrs = (void *)ehdr + ehdr->e_shoff;
401         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
402
403         /* Find the section they want */
404         for (i = 1; i < ehdr->e_shnum; i++) {
405                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
406                         if (size)
407                                 *size = sechdrs[i].sh_size;
408                         return (void *)ehdr + sechdrs[i].sh_offset;
409                 }
410         }
411         if (size)
412                 *size = 0;
413         return NULL;
414 }
415
416 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
417                                         const char *symname)
418 {
419         unsigned int i;
420         char name[MAX_SYMNAME], *c;
421
422         for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
423                 if (lib->dynsym[i].st_name == 0)
424                         continue;
425                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
426                         MAX_SYMNAME);
427                 c = strchr(name, '@');
428                 if (c)
429                         *c = 0;
430                 if (strcmp(symname, name) == 0)
431                         return &lib->dynsym[i];
432         }
433         return NULL;
434 }
435
436 /* Note that we assume the section is .text and the symbol is relative to
437  * the library base
438  */
439 static unsigned long __init find_function64(struct lib64_elfinfo *lib,
440                                             const char *symname)
441 {
442         Elf64_Sym *sym = find_symbol64(lib, symname);
443
444         if (sym == NULL) {
445                 printk(KERN_WARNING "vDSO64: function %s not found !\n",
446                        symname);
447                 return 0;
448         }
449 #ifdef VDS64_HAS_DESCRIPTORS
450         return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
451                 VDSO64_LBASE;
452 #else
453         return sym->st_value - VDSO64_LBASE;
454 #endif
455 }
456
457 static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32,
458                                        struct lib64_elfinfo *v64,
459                                        const char *orig, const char *fix)
460 {
461         Elf64_Sym *sym64_gen, *sym64_fix;
462
463         sym64_gen = find_symbol64(v64, orig);
464         if (sym64_gen == NULL) {
465                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
466                 return -1;
467         }
468         if (fix == NULL) {
469                 sym64_gen->st_name = 0;
470                 return 0;
471         }
472         sym64_fix = find_symbol64(v64, fix);
473         if (sym64_fix == NULL) {
474                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
475                 return -1;
476         }
477         sym64_gen->st_value = sym64_fix->st_value;
478         sym64_gen->st_size = sym64_fix->st_size;
479         sym64_gen->st_info = sym64_fix->st_info;
480         sym64_gen->st_other = sym64_fix->st_other;
481         sym64_gen->st_shndx = sym64_fix->st_shndx;
482
483         return 0;
484 }
485
486 #endif /* CONFIG_PPC64 */
487
488
489 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
490                                         struct lib64_elfinfo *v64)
491 {
492         void *sect;
493
494         /*
495          * Locate symbol tables & text section
496          */
497
498         v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
499         v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
500         if (v32->dynsym == NULL || v32->dynstr == NULL) {
501                 printk(KERN_ERR "vDSO32: required symbol section not found\n");
502                 return -1;
503         }
504         sect = find_section32(v32->hdr, ".text", NULL);
505         if (sect == NULL) {
506                 printk(KERN_ERR "vDSO32: the .text section was not found\n");
507                 return -1;
508         }
509         v32->text = sect - vdso32_kbase;
510
511 #ifdef CONFIG_PPC64
512         v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
513         v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
514         if (v64->dynsym == NULL || v64->dynstr == NULL) {
515                 printk(KERN_ERR "vDSO64: required symbol section not found\n");
516                 return -1;
517         }
518         sect = find_section64(v64->hdr, ".text", NULL);
519         if (sect == NULL) {
520                 printk(KERN_ERR "vDSO64: the .text section was not found\n");
521                 return -1;
522         }
523         v64->text = sect - vdso64_kbase;
524 #endif /* CONFIG_PPC64 */
525
526         return 0;
527 }
528
529 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
530                                           struct lib64_elfinfo *v64)
531 {
532         /*
533          * Find signal trampolines
534          */
535
536 #ifdef CONFIG_PPC64
537         vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
538 #endif
539         vdso32_sigtramp    = find_function32(v32, "__kernel_sigtramp32");
540         vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
541 }
542
543 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
544                                        struct lib64_elfinfo *v64)
545 {
546         Elf32_Sym *sym32;
547 #ifdef CONFIG_PPC64
548         Elf64_Sym *sym64;
549
550         sym64 = find_symbol64(v64, "__kernel_datapage_offset");
551         if (sym64 == NULL) {
552                 printk(KERN_ERR "vDSO64: Can't find symbol "
553                        "__kernel_datapage_offset !\n");
554                 return -1;
555         }
556         *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
557                 (vdso64_pages << PAGE_SHIFT) -
558                 (sym64->st_value - VDSO64_LBASE);
559 #endif /* CONFIG_PPC64 */
560
561         sym32 = find_symbol32(v32, "__kernel_datapage_offset");
562         if (sym32 == NULL) {
563                 printk(KERN_ERR "vDSO32: Can't find symbol "
564                        "__kernel_datapage_offset !\n");
565                 return -1;
566         }
567         *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
568                 (vdso32_pages << PAGE_SHIFT) -
569                 (sym32->st_value - VDSO32_LBASE);
570
571         return 0;
572 }
573
574
575 static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
576                                       struct lib64_elfinfo *v64)
577 {
578         void *start32;
579         unsigned long size32;
580
581 #ifdef CONFIG_PPC64
582         void *start64;
583         unsigned long size64;
584
585         start64 = find_section64(v64->hdr, "__ftr_fixup", &size64);
586         if (start64)
587                 do_feature_fixups(cur_cpu_spec->cpu_features,
588                                   start64, start64 + size64);
589
590         start64 = find_section64(v64->hdr, "__mmu_ftr_fixup", &size64);
591         if (start64)
592                 do_feature_fixups(cur_cpu_spec->mmu_features,
593                                   start64, start64 + size64);
594
595         start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64);
596         if (start64)
597                 do_feature_fixups(powerpc_firmware_features,
598                                   start64, start64 + size64);
599
600         start64 = find_section64(v64->hdr, "__lwsync_fixup", &size64);
601         if (start64)
602                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
603                                  start64, start64 + size64);
604 #endif /* CONFIG_PPC64 */
605
606         start32 = find_section32(v32->hdr, "__ftr_fixup", &size32);
607         if (start32)
608                 do_feature_fixups(cur_cpu_spec->cpu_features,
609                                   start32, start32 + size32);
610
611         start32 = find_section32(v32->hdr, "__mmu_ftr_fixup", &size32);
612         if (start32)
613                 do_feature_fixups(cur_cpu_spec->mmu_features,
614                                   start32, start32 + size32);
615
616 #ifdef CONFIG_PPC64
617         start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32);
618         if (start32)
619                 do_feature_fixups(powerpc_firmware_features,
620                                   start32, start32 + size32);
621 #endif /* CONFIG_PPC64 */
622
623         start32 = find_section32(v32->hdr, "__lwsync_fixup", &size32);
624         if (start32)
625                 do_lwsync_fixups(cur_cpu_spec->cpu_features,
626                                  start32, start32 + size32);
627
628         return 0;
629 }
630
631 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
632                                        struct lib64_elfinfo *v64)
633 {
634         int i;
635
636         for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
637                 struct vdso_patch_def *patch = &vdso_patches[i];
638                 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
639                         == patch->ftr_value;
640                 if (!match)
641                         continue;
642
643                 DBG("replacing %s with %s...\n", patch->gen_name,
644                     patch->fix_name ? "NONE" : patch->fix_name);
645
646                 /*
647                  * Patch the 32 bits and 64 bits symbols. Note that we do not
648                  * patch the "." symbol on 64 bits.
649                  * It would be easy to do, but doesn't seem to be necessary,
650                  * patching the OPD symbol is enough.
651                  */
652                 vdso_do_func_patch32(v32, v64, patch->gen_name,
653                                      patch->fix_name);
654 #ifdef CONFIG_PPC64
655                 vdso_do_func_patch64(v32, v64, patch->gen_name,
656                                      patch->fix_name);
657 #endif /* CONFIG_PPC64 */
658         }
659
660         return 0;
661 }
662
663
664 static __init int vdso_setup(void)
665 {
666         struct lib32_elfinfo    v32;
667         struct lib64_elfinfo    v64;
668
669         v32.hdr = vdso32_kbase;
670 #ifdef CONFIG_PPC64
671         v64.hdr = vdso64_kbase;
672 #endif
673         if (vdso_do_find_sections(&v32, &v64))
674                 return -1;
675
676         if (vdso_fixup_datapage(&v32, &v64))
677                 return -1;
678
679         if (vdso_fixup_features(&v32, &v64))
680                 return -1;
681
682         if (vdso_fixup_alt_funcs(&v32, &v64))
683                 return -1;
684
685         vdso_setup_trampolines(&v32, &v64);
686
687         return 0;
688 }
689
690 /*
691  * Called from setup_arch to initialize the bitmap of available
692  * syscalls in the systemcfg page
693  */
694 static void __init vdso_setup_syscall_map(void)
695 {
696         unsigned int i;
697         extern unsigned long *sys_call_table;
698         extern unsigned long sys_ni_syscall;
699
700
701         for (i = 0; i < __NR_syscalls; i++) {
702 #ifdef CONFIG_PPC64
703                 if (sys_call_table[i*2] != sys_ni_syscall)
704                         vdso_data->syscall_map_64[i >> 5] |=
705                                 0x80000000UL >> (i & 0x1f);
706                 if (sys_call_table[i*2+1] != sys_ni_syscall)
707                         vdso_data->syscall_map_32[i >> 5] |=
708                                 0x80000000UL >> (i & 0x1f);
709 #else /* CONFIG_PPC64 */
710                 if (sys_call_table[i] != sys_ni_syscall)
711                         vdso_data->syscall_map_32[i >> 5] |=
712                                 0x80000000UL >> (i & 0x1f);
713 #endif /* CONFIG_PPC64 */
714         }
715 }
716
717
718 static int __init vdso_init(void)
719 {
720         int i;
721
722 #ifdef CONFIG_PPC64
723         /*
724          * Fill up the "systemcfg" stuff for backward compatibility
725          */
726         strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
727         vdso_data->version.major = SYSTEMCFG_MAJOR;
728         vdso_data->version.minor = SYSTEMCFG_MINOR;
729         vdso_data->processor = mfspr(SPRN_PVR);
730         /*
731          * Fake the old platform number for pSeries and iSeries and add
732          * in LPAR bit if necessary
733          */
734         vdso_data->platform = machine_is(iseries) ? 0x200 : 0x100;
735         if (firmware_has_feature(FW_FEATURE_LPAR))
736                 vdso_data->platform |= 1;
737         vdso_data->physicalMemorySize = memblock_phys_mem_size();
738         vdso_data->dcache_size = ppc64_caches.dsize;
739         vdso_data->dcache_line_size = ppc64_caches.dline_size;
740         vdso_data->icache_size = ppc64_caches.isize;
741         vdso_data->icache_line_size = ppc64_caches.iline_size;
742
743         /* XXXOJN: Blocks should be added to ppc64_caches and used instead */
744         vdso_data->dcache_block_size = ppc64_caches.dline_size;
745         vdso_data->icache_block_size = ppc64_caches.iline_size;
746         vdso_data->dcache_log_block_size = ppc64_caches.log_dline_size;
747         vdso_data->icache_log_block_size = ppc64_caches.log_iline_size;
748
749         /*
750          * Calculate the size of the 64 bits vDSO
751          */
752         vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
753         DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
754 #else
755         vdso_data->dcache_block_size = L1_CACHE_BYTES;
756         vdso_data->dcache_log_block_size = L1_CACHE_SHIFT;
757         vdso_data->icache_block_size = L1_CACHE_BYTES;
758         vdso_data->icache_log_block_size = L1_CACHE_SHIFT;
759 #endif /* CONFIG_PPC64 */
760
761
762         /*
763          * Calculate the size of the 32 bits vDSO
764          */
765         vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
766         DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
767
768
769         /*
770          * Setup the syscall map in the vDOS
771          */
772         vdso_setup_syscall_map();
773
774         /*
775          * Initialize the vDSO images in memory, that is do necessary
776          * fixups of vDSO symbols, locate trampolines, etc...
777          */
778         if (vdso_setup()) {
779                 printk(KERN_ERR "vDSO setup failure, not enabled !\n");
780                 vdso32_pages = 0;
781 #ifdef CONFIG_PPC64
782                 vdso64_pages = 0;
783 #endif
784                 return 0;
785         }
786
787         /* Make sure pages are in the correct state */
788         vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2),
789                                   GFP_KERNEL);
790         BUG_ON(vdso32_pagelist == NULL);
791         for (i = 0; i < vdso32_pages; i++) {
792                 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
793                 ClearPageReserved(pg);
794                 get_page(pg);
795                 vdso32_pagelist[i] = pg;
796         }
797         vdso32_pagelist[i++] = virt_to_page(vdso_data);
798         vdso32_pagelist[i] = NULL;
799
800 #ifdef CONFIG_PPC64
801         vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2),
802                                   GFP_KERNEL);
803         BUG_ON(vdso64_pagelist == NULL);
804         for (i = 0; i < vdso64_pages; i++) {
805                 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
806                 ClearPageReserved(pg);
807                 get_page(pg);
808                 vdso64_pagelist[i] = pg;
809         }
810         vdso64_pagelist[i++] = virt_to_page(vdso_data);
811         vdso64_pagelist[i] = NULL;
812 #endif /* CONFIG_PPC64 */
813
814         get_page(virt_to_page(vdso_data));
815
816         smp_wmb();
817         vdso_ready = 1;
818
819         return 0;
820 }
821 arch_initcall(vdso_init);
822
823 int in_gate_area_no_mm(unsigned long addr)
824 {
825         return 0;
826 }
827
828 int in_gate_area(struct mm_struct *mm, unsigned long addr)
829 {
830         return 0;
831 }
832
833 struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
834 {
835         return NULL;
836 }
837