Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...
[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/stddef.h>
18 #include <linux/unistd.h>
19 #include <linux/slab.h>
20 #include <linux/user.h>
21 #include <linux/elf.h>
22 #include <linux/security.h>
23 #include <linux/bootmem.h>
24
25 #include <asm/pgtable.h>
26 #include <asm/system.h>
27 #include <asm/processor.h>
28 #include <asm/mmu.h>
29 #include <asm/mmu_context.h>
30 #include <asm/lmb.h>
31 #include <asm/machdep.h>
32 #include <asm/cputable.h>
33 #include <asm/sections.h>
34 #include <asm/firmware.h>
35 #include <asm/vdso.h>
36 #include <asm/vdso_datapage.h>
37
38 #include "setup.h"
39
40 #undef DEBUG
41
42 #ifdef DEBUG
43 #define DBG(fmt...) printk(fmt)
44 #else
45 #define DBG(fmt...)
46 #endif
47
48 /* Max supported size for symbol names */
49 #define MAX_SYMNAME     64
50
51 extern char vdso32_start, vdso32_end;
52 static void *vdso32_kbase = &vdso32_start;
53 static unsigned int vdso32_pages;
54 static struct page **vdso32_pagelist;
55 unsigned long vdso32_sigtramp;
56 unsigned long vdso32_rt_sigtramp;
57
58 #ifdef CONFIG_PPC64
59 extern char vdso64_start, vdso64_end;
60 static void *vdso64_kbase = &vdso64_start;
61 static unsigned int vdso64_pages;
62 static struct page **vdso64_pagelist;
63 unsigned long vdso64_rt_sigtramp;
64 #endif /* CONFIG_PPC64 */
65
66 static int vdso_ready;
67
68 /*
69  * The vdso data page (aka. systemcfg for old ppc64 fans) is here.
70  * Once the early boot kernel code no longer needs to muck around
71  * with it, it will become dynamically allocated
72  */
73 static union {
74         struct vdso_data        data;
75         u8                      page[PAGE_SIZE];
76 } vdso_data_store __attribute__((__section__(".data.page_aligned")));
77 struct vdso_data *vdso_data = &vdso_data_store.data;
78
79 /* Format of the patch table */
80 struct vdso_patch_def
81 {
82         unsigned long   ftr_mask, ftr_value;
83         const char      *gen_name;
84         const char      *fix_name;
85 };
86
87 /* Table of functions to patch based on the CPU type/revision
88  *
89  * Currently, we only change sync_dicache to do nothing on processors
90  * with a coherent icache
91  */
92 static struct vdso_patch_def vdso_patches[] = {
93         {
94                 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
95                 "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
96         },
97         {
98                 CPU_FTR_USE_TB, 0,
99                 "__kernel_gettimeofday", NULL
100         },
101         {
102                 CPU_FTR_USE_TB, 0,
103                 "__kernel_clock_gettime", NULL
104         },
105         {
106                 CPU_FTR_USE_TB, 0,
107                 "__kernel_clock_getres", NULL
108         },
109         {
110                 CPU_FTR_USE_TB, 0,
111                 "__kernel_get_tbfreq", NULL
112         },
113 };
114
115 /*
116  * Some infos carried around for each of them during parsing at
117  * boot time.
118  */
119 struct lib32_elfinfo
120 {
121         Elf32_Ehdr      *hdr;           /* ptr to ELF */
122         Elf32_Sym       *dynsym;        /* ptr to .dynsym section */
123         unsigned long   dynsymsize;     /* size of .dynsym section */
124         char            *dynstr;        /* ptr to .dynstr section */
125         unsigned long   text;           /* offset of .text section in .so */
126 };
127
128 struct lib64_elfinfo
129 {
130         Elf64_Ehdr      *hdr;
131         Elf64_Sym       *dynsym;
132         unsigned long   dynsymsize;
133         char            *dynstr;
134         unsigned long   text;
135 };
136
137
138 #ifdef __DEBUG
139 static void dump_one_vdso_page(struct page *pg, struct page *upg)
140 {
141         printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT),
142                page_count(pg),
143                pg->flags);
144         if (upg/* && pg != upg*/) {
145                 printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg)
146                                                        << PAGE_SHIFT),
147                        page_count(upg),
148                        upg->flags);
149         }
150         printk("\n");
151 }
152
153 static void dump_vdso_pages(struct vm_area_struct * vma)
154 {
155         int i;
156
157         if (!vma || test_thread_flag(TIF_32BIT)) {
158                 printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase);
159                 for (i=0; i<vdso32_pages; i++) {
160                         struct page *pg = virt_to_page(vdso32_kbase +
161                                                        i*PAGE_SIZE);
162                         struct page *upg = (vma && vma->vm_mm) ?
163                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
164                                 : NULL;
165                         dump_one_vdso_page(pg, upg);
166                 }
167         }
168         if (!vma || !test_thread_flag(TIF_32BIT)) {
169                 printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase);
170                 for (i=0; i<vdso64_pages; i++) {
171                         struct page *pg = virt_to_page(vdso64_kbase +
172                                                        i*PAGE_SIZE);
173                         struct page *upg = (vma && vma->vm_mm) ?
174                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
175                                 : NULL;
176                         dump_one_vdso_page(pg, upg);
177                 }
178         }
179 }
180 #endif /* DEBUG */
181
182 /*
183  * This is called from binfmt_elf, we create the special vma for the
184  * vDSO and insert it into the mm struct tree
185  */
186 int arch_setup_additional_pages(struct linux_binprm *bprm,
187                                 int executable_stack)
188 {
189         struct mm_struct *mm = current->mm;
190         struct page **vdso_pagelist;
191         unsigned long vdso_pages;
192         unsigned long vdso_base;
193         int rc;
194
195         if (!vdso_ready)
196                 return 0;
197
198 #ifdef CONFIG_PPC64
199         if (test_thread_flag(TIF_32BIT)) {
200                 vdso_pagelist = vdso32_pagelist;
201                 vdso_pages = vdso32_pages;
202                 vdso_base = VDSO32_MBASE;
203         } else {
204                 vdso_pagelist = vdso64_pagelist;
205                 vdso_pages = vdso64_pages;
206                 vdso_base = VDSO64_MBASE;
207         }
208 #else
209         vdso_pagelist = vdso32_pagelist;
210         vdso_pages = vdso32_pages;
211         vdso_base = VDSO32_MBASE;
212 #endif
213
214         current->mm->context.vdso_base = 0;
215
216         /* vDSO has a problem and was disabled, just don't "enable" it for the
217          * process
218          */
219         if (vdso_pages == 0)
220                 return 0;
221         /* Add a page to the vdso size for the data page */
222         vdso_pages ++;
223
224         /*
225          * pick a base address for the vDSO in process space. We try to put it
226          * at vdso_base which is the "natural" base for it, but we might fail
227          * and end up putting it elsewhere.
228          */
229         down_write(&mm->mmap_sem);
230         vdso_base = get_unmapped_area(NULL, vdso_base,
231                                       vdso_pages << PAGE_SHIFT, 0, 0);
232         if (IS_ERR_VALUE(vdso_base)) {
233                 rc = vdso_base;
234                 goto fail_mmapsem;
235         }
236
237         /*
238          * our vma flags don't have VM_WRITE so by default, the process isn't
239          * allowed to write those pages.
240          * gdb can break that with ptrace interface, and thus trigger COW on
241          * those pages but it's then your responsibility to never do that on
242          * the "data" page of the vDSO or you'll stop getting kernel updates
243          * and your nice userland gettimeofday will be totally dead.
244          * It's fine to use that for setting breakpoints in the vDSO code
245          * pages though
246          *
247          * Make sure the vDSO gets into every core dump.
248          * Dumping its contents makes post-mortem fully interpretable later
249          * without matching up the same kernel and hardware config to see
250          * what PC values meant.
251          */
252         rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
253                                      VM_READ|VM_EXEC|
254                                      VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
255                                      VM_ALWAYSDUMP,
256                                      vdso_pagelist);
257         if (rc)
258                 goto fail_mmapsem;
259
260         /* Put vDSO base into mm struct */
261         current->mm->context.vdso_base = vdso_base;
262
263         up_write(&mm->mmap_sem);
264         return 0;
265
266  fail_mmapsem:
267         up_write(&mm->mmap_sem);
268         return rc;
269 }
270
271 const char *arch_vma_name(struct vm_area_struct *vma)
272 {
273         if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
274                 return "[vdso]";
275         return NULL;
276 }
277
278
279
280 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
281                                   unsigned long *size)
282 {
283         Elf32_Shdr *sechdrs;
284         unsigned int i;
285         char *secnames;
286
287         /* Grab section headers and strings so we can tell who is who */
288         sechdrs = (void *)ehdr + ehdr->e_shoff;
289         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
290
291         /* Find the section they want */
292         for (i = 1; i < ehdr->e_shnum; i++) {
293                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
294                         if (size)
295                                 *size = sechdrs[i].sh_size;
296                         return (void *)ehdr + sechdrs[i].sh_offset;
297                 }
298         }
299         *size = 0;
300         return NULL;
301 }
302
303 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
304                                         const char *symname)
305 {
306         unsigned int i;
307         char name[MAX_SYMNAME], *c;
308
309         for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
310                 if (lib->dynsym[i].st_name == 0)
311                         continue;
312                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
313                         MAX_SYMNAME);
314                 c = strchr(name, '@');
315                 if (c)
316                         *c = 0;
317                 if (strcmp(symname, name) == 0)
318                         return &lib->dynsym[i];
319         }
320         return NULL;
321 }
322
323 /* Note that we assume the section is .text and the symbol is relative to
324  * the library base
325  */
326 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
327                                             const char *symname)
328 {
329         Elf32_Sym *sym = find_symbol32(lib, symname);
330
331         if (sym == NULL) {
332                 printk(KERN_WARNING "vDSO32: function %s not found !\n",
333                        symname);
334                 return 0;
335         }
336         return sym->st_value - VDSO32_LBASE;
337 }
338
339 static int vdso_do_func_patch32(struct lib32_elfinfo *v32,
340                                 struct lib64_elfinfo *v64,
341                                 const char *orig, const char *fix)
342 {
343         Elf32_Sym *sym32_gen, *sym32_fix;
344
345         sym32_gen = find_symbol32(v32, orig);
346         if (sym32_gen == NULL) {
347                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
348                 return -1;
349         }
350         if (fix == NULL) {
351                 sym32_gen->st_name = 0;
352                 return 0;
353         }
354         sym32_fix = find_symbol32(v32, fix);
355         if (sym32_fix == NULL) {
356                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
357                 return -1;
358         }
359         sym32_gen->st_value = sym32_fix->st_value;
360         sym32_gen->st_size = sym32_fix->st_size;
361         sym32_gen->st_info = sym32_fix->st_info;
362         sym32_gen->st_other = sym32_fix->st_other;
363         sym32_gen->st_shndx = sym32_fix->st_shndx;
364
365         return 0;
366 }
367
368
369 #ifdef CONFIG_PPC64
370
371 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
372                                   unsigned long *size)
373 {
374         Elf64_Shdr *sechdrs;
375         unsigned int i;
376         char *secnames;
377
378         /* Grab section headers and strings so we can tell who is who */
379         sechdrs = (void *)ehdr + ehdr->e_shoff;
380         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
381
382         /* Find the section they want */
383         for (i = 1; i < ehdr->e_shnum; i++) {
384                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
385                         if (size)
386                                 *size = sechdrs[i].sh_size;
387                         return (void *)ehdr + sechdrs[i].sh_offset;
388                 }
389         }
390         if (size)
391                 *size = 0;
392         return NULL;
393 }
394
395 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
396                                         const char *symname)
397 {
398         unsigned int i;
399         char name[MAX_SYMNAME], *c;
400
401         for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
402                 if (lib->dynsym[i].st_name == 0)
403                         continue;
404                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
405                         MAX_SYMNAME);
406                 c = strchr(name, '@');
407                 if (c)
408                         *c = 0;
409                 if (strcmp(symname, name) == 0)
410                         return &lib->dynsym[i];
411         }
412         return NULL;
413 }
414
415 /* Note that we assume the section is .text and the symbol is relative to
416  * the library base
417  */
418 static unsigned long __init find_function64(struct lib64_elfinfo *lib,
419                                             const char *symname)
420 {
421         Elf64_Sym *sym = find_symbol64(lib, symname);
422
423         if (sym == NULL) {
424                 printk(KERN_WARNING "vDSO64: function %s not found !\n",
425                        symname);
426                 return 0;
427         }
428 #ifdef VDS64_HAS_DESCRIPTORS
429         return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
430                 VDSO64_LBASE;
431 #else
432         return sym->st_value - VDSO64_LBASE;
433 #endif
434 }
435
436 static int vdso_do_func_patch64(struct lib32_elfinfo *v32,
437                                 struct lib64_elfinfo *v64,
438                                 const char *orig, const char *fix)
439 {
440         Elf64_Sym *sym64_gen, *sym64_fix;
441
442         sym64_gen = find_symbol64(v64, orig);
443         if (sym64_gen == NULL) {
444                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
445                 return -1;
446         }
447         if (fix == NULL) {
448                 sym64_gen->st_name = 0;
449                 return 0;
450         }
451         sym64_fix = find_symbol64(v64, fix);
452         if (sym64_fix == NULL) {
453                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
454                 return -1;
455         }
456         sym64_gen->st_value = sym64_fix->st_value;
457         sym64_gen->st_size = sym64_fix->st_size;
458         sym64_gen->st_info = sym64_fix->st_info;
459         sym64_gen->st_other = sym64_fix->st_other;
460         sym64_gen->st_shndx = sym64_fix->st_shndx;
461
462         return 0;
463 }
464
465 #endif /* CONFIG_PPC64 */
466
467
468 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
469                                         struct lib64_elfinfo *v64)
470 {
471         void *sect;
472
473         /*
474          * Locate symbol tables & text section
475          */
476
477         v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
478         v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
479         if (v32->dynsym == NULL || v32->dynstr == NULL) {
480                 printk(KERN_ERR "vDSO32: required symbol section not found\n");
481                 return -1;
482         }
483         sect = find_section32(v32->hdr, ".text", NULL);
484         if (sect == NULL) {
485                 printk(KERN_ERR "vDSO32: the .text section was not found\n");
486                 return -1;
487         }
488         v32->text = sect - vdso32_kbase;
489
490 #ifdef CONFIG_PPC64
491         v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
492         v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
493         if (v64->dynsym == NULL || v64->dynstr == NULL) {
494                 printk(KERN_ERR "vDSO64: required symbol section not found\n");
495                 return -1;
496         }
497         sect = find_section64(v64->hdr, ".text", NULL);
498         if (sect == NULL) {
499                 printk(KERN_ERR "vDSO64: the .text section was not found\n");
500                 return -1;
501         }
502         v64->text = sect - vdso64_kbase;
503 #endif /* CONFIG_PPC64 */
504
505         return 0;
506 }
507
508 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
509                                           struct lib64_elfinfo *v64)
510 {
511         /*
512          * Find signal trampolines
513          */
514
515 #ifdef CONFIG_PPC64
516         vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
517 #endif
518         vdso32_sigtramp    = find_function32(v32, "__kernel_sigtramp32");
519         vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
520 }
521
522 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
523                                        struct lib64_elfinfo *v64)
524 {
525         Elf32_Sym *sym32;
526 #ifdef CONFIG_PPC64
527         Elf64_Sym *sym64;
528
529         sym64 = find_symbol64(v64, "__kernel_datapage_offset");
530         if (sym64 == NULL) {
531                 printk(KERN_ERR "vDSO64: Can't find symbol "
532                        "__kernel_datapage_offset !\n");
533                 return -1;
534         }
535         *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
536                 (vdso64_pages << PAGE_SHIFT) -
537                 (sym64->st_value - VDSO64_LBASE);
538 #endif /* CONFIG_PPC64 */
539
540         sym32 = find_symbol32(v32, "__kernel_datapage_offset");
541         if (sym32 == NULL) {
542                 printk(KERN_ERR "vDSO32: Can't find symbol "
543                        "__kernel_datapage_offset !\n");
544                 return -1;
545         }
546         *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
547                 (vdso32_pages << PAGE_SHIFT) -
548                 (sym32->st_value - VDSO32_LBASE);
549
550         return 0;
551 }
552
553
554 static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
555                                       struct lib64_elfinfo *v64)
556 {
557         void *start32;
558         unsigned long size32;
559
560 #ifdef CONFIG_PPC64
561         void *start64;
562         unsigned long size64;
563
564         start64 = find_section64(v64->hdr, "__ftr_fixup", &size64);
565         if (start64)
566                 do_feature_fixups(cur_cpu_spec->cpu_features,
567                                   start64, start64 + size64);
568
569         start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64);
570         if (start64)
571                 do_feature_fixups(powerpc_firmware_features,
572                                   start64, start64 + size64);
573 #endif /* CONFIG_PPC64 */
574
575         start32 = find_section32(v32->hdr, "__ftr_fixup", &size32);
576         if (start32)
577                 do_feature_fixups(cur_cpu_spec->cpu_features,
578                                   start32, start32 + size32);
579
580 #ifdef CONFIG_PPC64
581         start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32);
582         if (start32)
583                 do_feature_fixups(powerpc_firmware_features,
584                                   start32, start32 + size32);
585 #endif /* CONFIG_PPC64 */
586
587         return 0;
588 }
589
590 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
591                                        struct lib64_elfinfo *v64)
592 {
593         int i;
594
595         for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
596                 struct vdso_patch_def *patch = &vdso_patches[i];
597                 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
598                         == patch->ftr_value;
599                 if (!match)
600                         continue;
601
602                 DBG("replacing %s with %s...\n", patch->gen_name,
603                     patch->fix_name ? "NONE" : patch->fix_name);
604
605                 /*
606                  * Patch the 32 bits and 64 bits symbols. Note that we do not
607                  * patch the "." symbol on 64 bits.
608                  * It would be easy to do, but doesn't seem to be necessary,
609                  * patching the OPD symbol is enough.
610                  */
611                 vdso_do_func_patch32(v32, v64, patch->gen_name,
612                                      patch->fix_name);
613 #ifdef CONFIG_PPC64
614                 vdso_do_func_patch64(v32, v64, patch->gen_name,
615                                      patch->fix_name);
616 #endif /* CONFIG_PPC64 */
617         }
618
619         return 0;
620 }
621
622
623 static __init int vdso_setup(void)
624 {
625         struct lib32_elfinfo    v32;
626         struct lib64_elfinfo    v64;
627
628         v32.hdr = vdso32_kbase;
629 #ifdef CONFIG_PPC64
630         v64.hdr = vdso64_kbase;
631 #endif
632         if (vdso_do_find_sections(&v32, &v64))
633                 return -1;
634
635         if (vdso_fixup_datapage(&v32, &v64))
636                 return -1;
637
638         if (vdso_fixup_features(&v32, &v64))
639                 return -1;
640
641         if (vdso_fixup_alt_funcs(&v32, &v64))
642                 return -1;
643
644         vdso_setup_trampolines(&v32, &v64);
645
646         return 0;
647 }
648
649 /*
650  * Called from setup_arch to initialize the bitmap of available
651  * syscalls in the systemcfg page
652  */
653 static void __init vdso_setup_syscall_map(void)
654 {
655         unsigned int i;
656         extern unsigned long *sys_call_table;
657         extern unsigned long sys_ni_syscall;
658
659
660         for (i = 0; i < __NR_syscalls; i++) {
661 #ifdef CONFIG_PPC64
662                 if (sys_call_table[i*2] != sys_ni_syscall)
663                         vdso_data->syscall_map_64[i >> 5] |=
664                                 0x80000000UL >> (i & 0x1f);
665                 if (sys_call_table[i*2+1] != sys_ni_syscall)
666                         vdso_data->syscall_map_32[i >> 5] |=
667                                 0x80000000UL >> (i & 0x1f);
668 #else /* CONFIG_PPC64 */
669                 if (sys_call_table[i] != sys_ni_syscall)
670                         vdso_data->syscall_map_32[i >> 5] |=
671                                 0x80000000UL >> (i & 0x1f);
672 #endif /* CONFIG_PPC64 */
673         }
674 }
675
676
677 static int __init vdso_init(void)
678 {
679         int i;
680
681 #ifdef CONFIG_PPC64
682         /*
683          * Fill up the "systemcfg" stuff for backward compatiblity
684          */
685         strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
686         vdso_data->version.major = SYSTEMCFG_MAJOR;
687         vdso_data->version.minor = SYSTEMCFG_MINOR;
688         vdso_data->processor = mfspr(SPRN_PVR);
689         /*
690          * Fake the old platform number for pSeries and iSeries and add
691          * in LPAR bit if necessary
692          */
693         vdso_data->platform = machine_is(iseries) ? 0x200 : 0x100;
694         if (firmware_has_feature(FW_FEATURE_LPAR))
695                 vdso_data->platform |= 1;
696         vdso_data->physicalMemorySize = lmb_phys_mem_size();
697         vdso_data->dcache_size = ppc64_caches.dsize;
698         vdso_data->dcache_line_size = ppc64_caches.dline_size;
699         vdso_data->icache_size = ppc64_caches.isize;
700         vdso_data->icache_line_size = ppc64_caches.iline_size;
701
702         /*
703          * Calculate the size of the 64 bits vDSO
704          */
705         vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
706         DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
707 #endif /* CONFIG_PPC64 */
708
709
710         /*
711          * Calculate the size of the 32 bits vDSO
712          */
713         vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
714         DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
715
716
717         /*
718          * Setup the syscall map in the vDOS
719          */
720         vdso_setup_syscall_map();
721
722         /*
723          * Initialize the vDSO images in memory, that is do necessary
724          * fixups of vDSO symbols, locate trampolines, etc...
725          */
726         if (vdso_setup()) {
727                 printk(KERN_ERR "vDSO setup failure, not enabled !\n");
728                 vdso32_pages = 0;
729 #ifdef CONFIG_PPC64
730                 vdso64_pages = 0;
731 #endif
732                 return 0;
733         }
734
735         /* Make sure pages are in the correct state */
736         vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2),
737                                   GFP_KERNEL);
738         BUG_ON(vdso32_pagelist == NULL);
739         for (i = 0; i < vdso32_pages; i++) {
740                 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
741                 ClearPageReserved(pg);
742                 get_page(pg);
743                 vdso32_pagelist[i] = pg;
744         }
745         vdso32_pagelist[i++] = virt_to_page(vdso_data);
746         vdso32_pagelist[i] = NULL;
747
748 #ifdef CONFIG_PPC64
749         vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2),
750                                   GFP_KERNEL);
751         BUG_ON(vdso64_pagelist == NULL);
752         for (i = 0; i < vdso64_pages; i++) {
753                 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
754                 ClearPageReserved(pg);
755                 get_page(pg);
756                 vdso64_pagelist[i] = pg;
757         }
758         vdso64_pagelist[i++] = virt_to_page(vdso_data);
759         vdso64_pagelist[i] = NULL;
760 #endif /* CONFIG_PPC64 */
761
762         get_page(virt_to_page(vdso_data));
763
764         smp_wmb();
765         vdso_ready = 1;
766
767         return 0;
768 }
769 arch_initcall(vdso_init);
770
771 int in_gate_area_no_task(unsigned long addr)
772 {
773         return 0;
774 }
775
776 int in_gate_area(struct task_struct *task, unsigned long addr)
777 {
778         return 0;
779 }
780
781 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
782 {
783         return NULL;
784 }
785