Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394...
[linux-2.6] / arch / powerpc / kernel / vdso.c
1 /*
2  *    Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
3  *                       <benh@kernel.crashing.org>
4  *
5  *  This program is free software; you can redistribute it and/or
6  *  modify it under the terms of the GNU General Public License
7  *  as published by the Free Software Foundation; either version
8  *  2 of the License, or (at your option) any later version.
9  */
10
11 #include <linux/module.h>
12 #include <linux/errno.h>
13 #include <linux/sched.h>
14 #include <linux/kernel.h>
15 #include <linux/mm.h>
16 #include <linux/smp.h>
17 #include <linux/smp_lock.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
26 #include <asm/pgtable.h>
27 #include <asm/system.h>
28 #include <asm/processor.h>
29 #include <asm/mmu.h>
30 #include <asm/mmu_context.h>
31 #include <asm/lmb.h>
32 #include <asm/machdep.h>
33 #include <asm/cputable.h>
34 #include <asm/sections.h>
35 #include <asm/firmware.h>
36 #include <asm/vdso.h>
37 #include <asm/vdso_datapage.h>
38
39 #include "setup.h"
40
41 #undef DEBUG
42
43 #ifdef DEBUG
44 #define DBG(fmt...) printk(fmt)
45 #else
46 #define DBG(fmt...)
47 #endif
48
49 /* Max supported size for symbol names */
50 #define MAX_SYMNAME     64
51
52 #define VDSO32_MAXPAGES (((0x3000 + PAGE_MASK) >> PAGE_SHIFT) + 2)
53 #define VDSO64_MAXPAGES (((0x3000 + PAGE_MASK) >> PAGE_SHIFT) + 2)
54
55 extern char vdso32_start, vdso32_end;
56 static void *vdso32_kbase = &vdso32_start;
57 unsigned int vdso32_pages;
58 static struct page *vdso32_pagelist[VDSO32_MAXPAGES];
59 unsigned long vdso32_sigtramp;
60 unsigned long vdso32_rt_sigtramp;
61
62 #ifdef CONFIG_PPC64
63 extern char vdso64_start, vdso64_end;
64 static void *vdso64_kbase = &vdso64_start;
65 unsigned int vdso64_pages;
66 static struct page *vdso64_pagelist[VDSO64_MAXPAGES];
67 unsigned long vdso64_rt_sigtramp;
68 #endif /* CONFIG_PPC64 */
69
70 /*
71  * The vdso data page (aka. systemcfg for old ppc64 fans) is here.
72  * Once the early boot kernel code no longer needs to muck around
73  * with it, it will become dynamically allocated
74  */
75 static union {
76         struct vdso_data        data;
77         u8                      page[PAGE_SIZE];
78 } vdso_data_store __attribute__((__section__(".data.page_aligned")));
79 struct vdso_data *vdso_data = &vdso_data_store.data;
80
81 /* Format of the patch table */
82 struct vdso_patch_def
83 {
84         unsigned long   ftr_mask, ftr_value;
85         const char      *gen_name;
86         const char      *fix_name;
87 };
88
89 /* Table of functions to patch based on the CPU type/revision
90  *
91  * Currently, we only change sync_dicache to do nothing on processors
92  * with a coherent icache
93  */
94 static struct vdso_patch_def vdso_patches[] = {
95         {
96                 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
97                 "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
98         },
99         {
100                 CPU_FTR_USE_TB, 0,
101                 "__kernel_gettimeofday", NULL
102         },
103 };
104
105 /*
106  * Some infos carried around for each of them during parsing at
107  * boot time.
108  */
109 struct lib32_elfinfo
110 {
111         Elf32_Ehdr      *hdr;           /* ptr to ELF */
112         Elf32_Sym       *dynsym;        /* ptr to .dynsym section */
113         unsigned long   dynsymsize;     /* size of .dynsym section */
114         char            *dynstr;        /* ptr to .dynstr section */
115         unsigned long   text;           /* offset of .text section in .so */
116 };
117
118 struct lib64_elfinfo
119 {
120         Elf64_Ehdr      *hdr;
121         Elf64_Sym       *dynsym;
122         unsigned long   dynsymsize;
123         char            *dynstr;
124         unsigned long   text;
125 };
126
127
128 #ifdef __DEBUG
129 static void dump_one_vdso_page(struct page *pg, struct page *upg)
130 {
131         printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT),
132                page_count(pg),
133                pg->flags);
134         if (upg/* && pg != upg*/) {
135                 printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg)
136                                                        << PAGE_SHIFT),
137                        page_count(upg),
138                        upg->flags);
139         }
140         printk("\n");
141 }
142
143 static void dump_vdso_pages(struct vm_area_struct * vma)
144 {
145         int i;
146
147         if (!vma || test_thread_flag(TIF_32BIT)) {
148                 printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase);
149                 for (i=0; i<vdso32_pages; i++) {
150                         struct page *pg = virt_to_page(vdso32_kbase +
151                                                        i*PAGE_SIZE);
152                         struct page *upg = (vma && vma->vm_mm) ?
153                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
154                                 : NULL;
155                         dump_one_vdso_page(pg, upg);
156                 }
157         }
158         if (!vma || !test_thread_flag(TIF_32BIT)) {
159                 printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase);
160                 for (i=0; i<vdso64_pages; i++) {
161                         struct page *pg = virt_to_page(vdso64_kbase +
162                                                        i*PAGE_SIZE);
163                         struct page *upg = (vma && vma->vm_mm) ?
164                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
165                                 : NULL;
166                         dump_one_vdso_page(pg, upg);
167                 }
168         }
169 }
170 #endif /* DEBUG */
171
172 /*
173  * This is called from binfmt_elf, we create the special vma for the
174  * vDSO and insert it into the mm struct tree
175  */
176 int arch_setup_additional_pages(struct linux_binprm *bprm,
177                                 int executable_stack)
178 {
179         struct mm_struct *mm = current->mm;
180         struct page **vdso_pagelist;
181         unsigned long vdso_pages;
182         unsigned long vdso_base;
183         int rc;
184
185 #ifdef CONFIG_PPC64
186         if (test_thread_flag(TIF_32BIT)) {
187                 vdso_pagelist = vdso32_pagelist;
188                 vdso_pages = vdso32_pages;
189                 vdso_base = VDSO32_MBASE;
190         } else {
191                 vdso_pagelist = vdso64_pagelist;
192                 vdso_pages = vdso64_pages;
193                 vdso_base = VDSO64_MBASE;
194         }
195 #else
196         vdso_pagelist = vdso32_pagelist;
197         vdso_pages = vdso32_pages;
198         vdso_base = VDSO32_MBASE;
199 #endif
200
201         current->mm->context.vdso_base = 0;
202
203         /* vDSO has a problem and was disabled, just don't "enable" it for the
204          * process
205          */
206         if (vdso_pages == 0)
207                 return 0;
208         /* Add a page to the vdso size for the data page */
209         vdso_pages ++;
210
211         /*
212          * pick a base address for the vDSO in process space. We try to put it
213          * at vdso_base which is the "natural" base for it, but we might fail
214          * and end up putting it elsewhere.
215          */
216         down_write(&mm->mmap_sem);
217         vdso_base = get_unmapped_area(NULL, vdso_base,
218                                       vdso_pages << PAGE_SHIFT, 0, 0);
219         if (IS_ERR_VALUE(vdso_base)) {
220                 rc = vdso_base;
221                 goto fail_mmapsem;
222         }
223
224         /*
225          * our vma flags don't have VM_WRITE so by default, the process isn't
226          * allowed to write those pages.
227          * gdb can break that with ptrace interface, and thus trigger COW on
228          * those pages but it's then your responsibility to never do that on
229          * the "data" page of the vDSO or you'll stop getting kernel updates
230          * and your nice userland gettimeofday will be totally dead.
231          * It's fine to use that for setting breakpoints in the vDSO code
232          * pages though
233          *
234          * Make sure the vDSO gets into every core dump.
235          * Dumping its contents makes post-mortem fully interpretable later
236          * without matching up the same kernel and hardware config to see
237          * what PC values meant.
238          */
239         rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
240                                      VM_READ|VM_EXEC|
241                                      VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
242                                      VM_ALWAYSDUMP,
243                                      vdso_pagelist);
244         if (rc)
245                 goto fail_mmapsem;
246
247         /* Put vDSO base into mm struct */
248         current->mm->context.vdso_base = vdso_base;
249
250         up_write(&mm->mmap_sem);
251         return 0;
252
253  fail_mmapsem:
254         up_write(&mm->mmap_sem);
255         return rc;
256 }
257
258 const char *arch_vma_name(struct vm_area_struct *vma)
259 {
260         if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
261                 return "[vdso]";
262         return NULL;
263 }
264
265
266
267 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
268                                   unsigned long *size)
269 {
270         Elf32_Shdr *sechdrs;
271         unsigned int i;
272         char *secnames;
273
274         /* Grab section headers and strings so we can tell who is who */
275         sechdrs = (void *)ehdr + ehdr->e_shoff;
276         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
277
278         /* Find the section they want */
279         for (i = 1; i < ehdr->e_shnum; i++) {
280                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
281                         if (size)
282                                 *size = sechdrs[i].sh_size;
283                         return (void *)ehdr + sechdrs[i].sh_offset;
284                 }
285         }
286         *size = 0;
287         return NULL;
288 }
289
290 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
291                                         const char *symname)
292 {
293         unsigned int i;
294         char name[MAX_SYMNAME], *c;
295
296         for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
297                 if (lib->dynsym[i].st_name == 0)
298                         continue;
299                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
300                         MAX_SYMNAME);
301                 c = strchr(name, '@');
302                 if (c)
303                         *c = 0;
304                 if (strcmp(symname, name) == 0)
305                         return &lib->dynsym[i];
306         }
307         return NULL;
308 }
309
310 /* Note that we assume the section is .text and the symbol is relative to
311  * the library base
312  */
313 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
314                                             const char *symname)
315 {
316         Elf32_Sym *sym = find_symbol32(lib, symname);
317
318         if (sym == NULL) {
319                 printk(KERN_WARNING "vDSO32: function %s not found !\n",
320                        symname);
321                 return 0;
322         }
323         return sym->st_value - VDSO32_LBASE;
324 }
325
326 static int vdso_do_func_patch32(struct lib32_elfinfo *v32,
327                                 struct lib64_elfinfo *v64,
328                                 const char *orig, const char *fix)
329 {
330         Elf32_Sym *sym32_gen, *sym32_fix;
331
332         sym32_gen = find_symbol32(v32, orig);
333         if (sym32_gen == NULL) {
334                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
335                 return -1;
336         }
337         if (fix == NULL) {
338                 sym32_gen->st_name = 0;
339                 return 0;
340         }
341         sym32_fix = find_symbol32(v32, fix);
342         if (sym32_fix == NULL) {
343                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
344                 return -1;
345         }
346         sym32_gen->st_value = sym32_fix->st_value;
347         sym32_gen->st_size = sym32_fix->st_size;
348         sym32_gen->st_info = sym32_fix->st_info;
349         sym32_gen->st_other = sym32_fix->st_other;
350         sym32_gen->st_shndx = sym32_fix->st_shndx;
351
352         return 0;
353 }
354
355
356 #ifdef CONFIG_PPC64
357
358 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
359                                   unsigned long *size)
360 {
361         Elf64_Shdr *sechdrs;
362         unsigned int i;
363         char *secnames;
364
365         /* Grab section headers and strings so we can tell who is who */
366         sechdrs = (void *)ehdr + ehdr->e_shoff;
367         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
368
369         /* Find the section they want */
370         for (i = 1; i < ehdr->e_shnum; i++) {
371                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
372                         if (size)
373                                 *size = sechdrs[i].sh_size;
374                         return (void *)ehdr + sechdrs[i].sh_offset;
375                 }
376         }
377         if (size)
378                 *size = 0;
379         return NULL;
380 }
381
382 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
383                                         const char *symname)
384 {
385         unsigned int i;
386         char name[MAX_SYMNAME], *c;
387
388         for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
389                 if (lib->dynsym[i].st_name == 0)
390                         continue;
391                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
392                         MAX_SYMNAME);
393                 c = strchr(name, '@');
394                 if (c)
395                         *c = 0;
396                 if (strcmp(symname, name) == 0)
397                         return &lib->dynsym[i];
398         }
399         return NULL;
400 }
401
402 /* Note that we assume the section is .text and the symbol is relative to
403  * the library base
404  */
405 static unsigned long __init find_function64(struct lib64_elfinfo *lib,
406                                             const char *symname)
407 {
408         Elf64_Sym *sym = find_symbol64(lib, symname);
409
410         if (sym == NULL) {
411                 printk(KERN_WARNING "vDSO64: function %s not found !\n",
412                        symname);
413                 return 0;
414         }
415 #ifdef VDS64_HAS_DESCRIPTORS
416         return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
417                 VDSO64_LBASE;
418 #else
419         return sym->st_value - VDSO64_LBASE;
420 #endif
421 }
422
423 static int vdso_do_func_patch64(struct lib32_elfinfo *v32,
424                                 struct lib64_elfinfo *v64,
425                                 const char *orig, const char *fix)
426 {
427         Elf64_Sym *sym64_gen, *sym64_fix;
428
429         sym64_gen = find_symbol64(v64, orig);
430         if (sym64_gen == NULL) {
431                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
432                 return -1;
433         }
434         if (fix == NULL) {
435                 sym64_gen->st_name = 0;
436                 return 0;
437         }
438         sym64_fix = find_symbol64(v64, fix);
439         if (sym64_fix == NULL) {
440                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
441                 return -1;
442         }
443         sym64_gen->st_value = sym64_fix->st_value;
444         sym64_gen->st_size = sym64_fix->st_size;
445         sym64_gen->st_info = sym64_fix->st_info;
446         sym64_gen->st_other = sym64_fix->st_other;
447         sym64_gen->st_shndx = sym64_fix->st_shndx;
448
449         return 0;
450 }
451
452 #endif /* CONFIG_PPC64 */
453
454
455 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
456                                         struct lib64_elfinfo *v64)
457 {
458         void *sect;
459
460         /*
461          * Locate symbol tables & text section
462          */
463
464         v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
465         v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
466         if (v32->dynsym == NULL || v32->dynstr == NULL) {
467                 printk(KERN_ERR "vDSO32: required symbol section not found\n");
468                 return -1;
469         }
470         sect = find_section32(v32->hdr, ".text", NULL);
471         if (sect == NULL) {
472                 printk(KERN_ERR "vDSO32: the .text section was not found\n");
473                 return -1;
474         }
475         v32->text = sect - vdso32_kbase;
476
477 #ifdef CONFIG_PPC64
478         v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
479         v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
480         if (v64->dynsym == NULL || v64->dynstr == NULL) {
481                 printk(KERN_ERR "vDSO64: required symbol section not found\n");
482                 return -1;
483         }
484         sect = find_section64(v64->hdr, ".text", NULL);
485         if (sect == NULL) {
486                 printk(KERN_ERR "vDSO64: the .text section was not found\n");
487                 return -1;
488         }
489         v64->text = sect - vdso64_kbase;
490 #endif /* CONFIG_PPC64 */
491
492         return 0;
493 }
494
495 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
496                                           struct lib64_elfinfo *v64)
497 {
498         /*
499          * Find signal trampolines
500          */
501
502 #ifdef CONFIG_PPC64
503         vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
504 #endif
505         vdso32_sigtramp    = find_function32(v32, "__kernel_sigtramp32");
506         vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
507 }
508
509 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
510                                        struct lib64_elfinfo *v64)
511 {
512         Elf32_Sym *sym32;
513 #ifdef CONFIG_PPC64
514         Elf64_Sym *sym64;
515
516         sym64 = find_symbol64(v64, "__kernel_datapage_offset");
517         if (sym64 == NULL) {
518                 printk(KERN_ERR "vDSO64: Can't find symbol "
519                        "__kernel_datapage_offset !\n");
520                 return -1;
521         }
522         *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
523                 (vdso64_pages << PAGE_SHIFT) -
524                 (sym64->st_value - VDSO64_LBASE);
525 #endif /* CONFIG_PPC64 */
526
527         sym32 = find_symbol32(v32, "__kernel_datapage_offset");
528         if (sym32 == NULL) {
529                 printk(KERN_ERR "vDSO32: Can't find symbol "
530                        "__kernel_datapage_offset !\n");
531                 return -1;
532         }
533         *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
534                 (vdso32_pages << PAGE_SHIFT) -
535                 (sym32->st_value - VDSO32_LBASE);
536
537         return 0;
538 }
539
540
541 static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
542                                       struct lib64_elfinfo *v64)
543 {
544         void *start32;
545         unsigned long size32;
546
547 #ifdef CONFIG_PPC64
548         void *start64;
549         unsigned long size64;
550
551         start64 = find_section64(v64->hdr, "__ftr_fixup", &size64);
552         if (start64)
553                 do_feature_fixups(cur_cpu_spec->cpu_features,
554                                   start64, start64 + size64);
555
556         start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64);
557         if (start64)
558                 do_feature_fixups(powerpc_firmware_features,
559                                   start64, start64 + size64);
560 #endif /* CONFIG_PPC64 */
561
562         start32 = find_section32(v32->hdr, "__ftr_fixup", &size32);
563         if (start32)
564                 do_feature_fixups(cur_cpu_spec->cpu_features,
565                                   start32, start32 + size32);
566
567 #ifdef CONFIG_PPC64
568         start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32);
569         if (start32)
570                 do_feature_fixups(powerpc_firmware_features,
571                                   start32, start32 + size32);
572 #endif /* CONFIG_PPC64 */
573
574         return 0;
575 }
576
577 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
578                                        struct lib64_elfinfo *v64)
579 {
580         int i;
581
582         for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
583                 struct vdso_patch_def *patch = &vdso_patches[i];
584                 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
585                         == patch->ftr_value;
586                 if (!match)
587                         continue;
588
589                 DBG("replacing %s with %s...\n", patch->gen_name,
590                     patch->fix_name ? "NONE" : patch->fix_name);
591
592                 /*
593                  * Patch the 32 bits and 64 bits symbols. Note that we do not
594                  * patch the "." symbol on 64 bits.
595                  * It would be easy to do, but doesn't seem to be necessary,
596                  * patching the OPD symbol is enough.
597                  */
598                 vdso_do_func_patch32(v32, v64, patch->gen_name,
599                                      patch->fix_name);
600 #ifdef CONFIG_PPC64
601                 vdso_do_func_patch64(v32, v64, patch->gen_name,
602                                      patch->fix_name);
603 #endif /* CONFIG_PPC64 */
604         }
605
606         return 0;
607 }
608
609
610 static __init int vdso_setup(void)
611 {
612         struct lib32_elfinfo    v32;
613         struct lib64_elfinfo    v64;
614
615         v32.hdr = vdso32_kbase;
616 #ifdef CONFIG_PPC64
617         v64.hdr = vdso64_kbase;
618 #endif
619         if (vdso_do_find_sections(&v32, &v64))
620                 return -1;
621
622         if (vdso_fixup_datapage(&v32, &v64))
623                 return -1;
624
625         if (vdso_fixup_features(&v32, &v64))
626                 return -1;
627
628         if (vdso_fixup_alt_funcs(&v32, &v64))
629                 return -1;
630
631         vdso_setup_trampolines(&v32, &v64);
632
633         return 0;
634 }
635
636 /*
637  * Called from setup_arch to initialize the bitmap of available
638  * syscalls in the systemcfg page
639  */
640 static void __init vdso_setup_syscall_map(void)
641 {
642         unsigned int i;
643         extern unsigned long *sys_call_table;
644         extern unsigned long sys_ni_syscall;
645
646
647         for (i = 0; i < __NR_syscalls; i++) {
648 #ifdef CONFIG_PPC64
649                 if (sys_call_table[i*2] != sys_ni_syscall)
650                         vdso_data->syscall_map_64[i >> 5] |=
651                                 0x80000000UL >> (i & 0x1f);
652                 if (sys_call_table[i*2+1] != sys_ni_syscall)
653                         vdso_data->syscall_map_32[i >> 5] |=
654                                 0x80000000UL >> (i & 0x1f);
655 #else /* CONFIG_PPC64 */
656                 if (sys_call_table[i] != sys_ni_syscall)
657                         vdso_data->syscall_map_32[i >> 5] |=
658                                 0x80000000UL >> (i & 0x1f);
659 #endif /* CONFIG_PPC64 */
660         }
661 }
662
663
664 void __init vdso_init(void)
665 {
666         int i;
667
668 #ifdef CONFIG_PPC64
669         /*
670          * Fill up the "systemcfg" stuff for backward compatiblity
671          */
672         strcpy(vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
673         vdso_data->version.major = SYSTEMCFG_MAJOR;
674         vdso_data->version.minor = SYSTEMCFG_MINOR;
675         vdso_data->processor = mfspr(SPRN_PVR);
676         /*
677          * Fake the old platform number for pSeries and iSeries and add
678          * in LPAR bit if necessary
679          */
680         vdso_data->platform = machine_is(iseries) ? 0x200 : 0x100;
681         if (firmware_has_feature(FW_FEATURE_LPAR))
682                 vdso_data->platform |= 1;
683         vdso_data->physicalMemorySize = lmb_phys_mem_size();
684         vdso_data->dcache_size = ppc64_caches.dsize;
685         vdso_data->dcache_line_size = ppc64_caches.dline_size;
686         vdso_data->icache_size = ppc64_caches.isize;
687         vdso_data->icache_line_size = ppc64_caches.iline_size;
688
689         /*
690          * Calculate the size of the 64 bits vDSO
691          */
692         vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
693         DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
694 #endif /* CONFIG_PPC64 */
695
696
697         /*
698          * Calculate the size of the 32 bits vDSO
699          */
700         vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
701         DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
702
703
704         /*
705          * Setup the syscall map in the vDOS
706          */
707         vdso_setup_syscall_map();
708
709         /*
710          * Initialize the vDSO images in memory, that is do necessary
711          * fixups of vDSO symbols, locate trampolines, etc...
712          */
713         if (vdso_setup()) {
714                 printk(KERN_ERR "vDSO setup failure, not enabled !\n");
715                 vdso32_pages = 0;
716 #ifdef CONFIG_PPC64
717                 vdso64_pages = 0;
718 #endif
719                 return;
720         }
721
722         /* Make sure pages are in the correct state */
723         BUG_ON(vdso32_pages + 2 > VDSO32_MAXPAGES);
724         for (i = 0; i < vdso32_pages; i++) {
725                 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
726                 ClearPageReserved(pg);
727                 get_page(pg);
728                 vdso32_pagelist[i] = pg;
729         }
730         vdso32_pagelist[i++] = virt_to_page(vdso_data);
731         vdso32_pagelist[i] = NULL;
732
733 #ifdef CONFIG_PPC64
734         BUG_ON(vdso64_pages + 2 > VDSO64_MAXPAGES);
735         for (i = 0; i < vdso64_pages; i++) {
736                 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
737                 ClearPageReserved(pg);
738                 get_page(pg);
739                 vdso64_pagelist[i] = pg;
740         }
741         vdso64_pagelist[i++] = virt_to_page(vdso_data);
742         vdso64_pagelist[i] = NULL;
743 #endif /* CONFIG_PPC64 */
744
745         get_page(virt_to_page(vdso_data));
746 }
747
748 int in_gate_area_no_task(unsigned long addr)
749 {
750         return 0;
751 }
752
753 int in_gate_area(struct task_struct *task, unsigned long addr)
754 {
755         return 0;
756 }
757
758 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
759 {
760         return NULL;
761 }
762