Pull remove-hotkey into release branch
[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 extern char vdso32_start, vdso32_end;
53 static void *vdso32_kbase = &vdso32_start;
54 static unsigned int vdso32_pages;
55 static struct page **vdso32_pagelist;
56 unsigned long vdso32_sigtramp;
57 unsigned long vdso32_rt_sigtramp;
58
59 #ifdef CONFIG_PPC64
60 extern char vdso64_start, vdso64_end;
61 static void *vdso64_kbase = &vdso64_start;
62 static unsigned int vdso64_pages;
63 static struct page **vdso64_pagelist;
64 unsigned long vdso64_rt_sigtramp;
65 #endif /* CONFIG_PPC64 */
66
67 static int vdso_ready;
68
69 /*
70  * The vdso data page (aka. systemcfg for old ppc64 fans) is here.
71  * Once the early boot kernel code no longer needs to muck around
72  * with it, it will become dynamically allocated
73  */
74 static union {
75         struct vdso_data        data;
76         u8                      page[PAGE_SIZE];
77 } vdso_data_store __attribute__((__section__(".data.page_aligned")));
78 struct vdso_data *vdso_data = &vdso_data_store.data;
79
80 /* Format of the patch table */
81 struct vdso_patch_def
82 {
83         unsigned long   ftr_mask, ftr_value;
84         const char      *gen_name;
85         const char      *fix_name;
86 };
87
88 /* Table of functions to patch based on the CPU type/revision
89  *
90  * Currently, we only change sync_dicache to do nothing on processors
91  * with a coherent icache
92  */
93 static struct vdso_patch_def vdso_patches[] = {
94         {
95                 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
96                 "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
97         },
98         {
99                 CPU_FTR_USE_TB, 0,
100                 "__kernel_gettimeofday", NULL
101         },
102 };
103
104 /*
105  * Some infos carried around for each of them during parsing at
106  * boot time.
107  */
108 struct lib32_elfinfo
109 {
110         Elf32_Ehdr      *hdr;           /* ptr to ELF */
111         Elf32_Sym       *dynsym;        /* ptr to .dynsym section */
112         unsigned long   dynsymsize;     /* size of .dynsym section */
113         char            *dynstr;        /* ptr to .dynstr section */
114         unsigned long   text;           /* offset of .text section in .so */
115 };
116
117 struct lib64_elfinfo
118 {
119         Elf64_Ehdr      *hdr;
120         Elf64_Sym       *dynsym;
121         unsigned long   dynsymsize;
122         char            *dynstr;
123         unsigned long   text;
124 };
125
126
127 #ifdef __DEBUG
128 static void dump_one_vdso_page(struct page *pg, struct page *upg)
129 {
130         printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT),
131                page_count(pg),
132                pg->flags);
133         if (upg/* && pg != upg*/) {
134                 printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg)
135                                                        << PAGE_SHIFT),
136                        page_count(upg),
137                        upg->flags);
138         }
139         printk("\n");
140 }
141
142 static void dump_vdso_pages(struct vm_area_struct * vma)
143 {
144         int i;
145
146         if (!vma || test_thread_flag(TIF_32BIT)) {
147                 printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase);
148                 for (i=0; i<vdso32_pages; i++) {
149                         struct page *pg = virt_to_page(vdso32_kbase +
150                                                        i*PAGE_SIZE);
151                         struct page *upg = (vma && vma->vm_mm) ?
152                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
153                                 : NULL;
154                         dump_one_vdso_page(pg, upg);
155                 }
156         }
157         if (!vma || !test_thread_flag(TIF_32BIT)) {
158                 printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase);
159                 for (i=0; i<vdso64_pages; i++) {
160                         struct page *pg = virt_to_page(vdso64_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 }
169 #endif /* DEBUG */
170
171 /*
172  * This is called from binfmt_elf, we create the special vma for the
173  * vDSO and insert it into the mm struct tree
174  */
175 int arch_setup_additional_pages(struct linux_binprm *bprm,
176                                 int executable_stack)
177 {
178         struct mm_struct *mm = current->mm;
179         struct page **vdso_pagelist;
180         unsigned long vdso_pages;
181         unsigned long vdso_base;
182         int rc;
183
184         if (!vdso_ready)
185                 return 0;
186
187 #ifdef CONFIG_PPC64
188         if (test_thread_flag(TIF_32BIT)) {
189                 vdso_pagelist = vdso32_pagelist;
190                 vdso_pages = vdso32_pages;
191                 vdso_base = VDSO32_MBASE;
192         } else {
193                 vdso_pagelist = vdso64_pagelist;
194                 vdso_pages = vdso64_pages;
195                 vdso_base = VDSO64_MBASE;
196         }
197 #else
198         vdso_pagelist = vdso32_pagelist;
199         vdso_pages = vdso32_pages;
200         vdso_base = VDSO32_MBASE;
201 #endif
202
203         current->mm->context.vdso_base = 0;
204
205         /* vDSO has a problem and was disabled, just don't "enable" it for the
206          * process
207          */
208         if (vdso_pages == 0)
209                 return 0;
210         /* Add a page to the vdso size for the data page */
211         vdso_pages ++;
212
213         /*
214          * pick a base address for the vDSO in process space. We try to put it
215          * at vdso_base which is the "natural" base for it, but we might fail
216          * and end up putting it elsewhere.
217          */
218         down_write(&mm->mmap_sem);
219         vdso_base = get_unmapped_area(NULL, vdso_base,
220                                       vdso_pages << PAGE_SHIFT, 0, 0);
221         if (IS_ERR_VALUE(vdso_base)) {
222                 rc = vdso_base;
223                 goto fail_mmapsem;
224         }
225
226         /*
227          * our vma flags don't have VM_WRITE so by default, the process isn't
228          * allowed to write those pages.
229          * gdb can break that with ptrace interface, and thus trigger COW on
230          * those pages but it's then your responsibility to never do that on
231          * the "data" page of the vDSO or you'll stop getting kernel updates
232          * and your nice userland gettimeofday will be totally dead.
233          * It's fine to use that for setting breakpoints in the vDSO code
234          * pages though
235          *
236          * Make sure the vDSO gets into every core dump.
237          * Dumping its contents makes post-mortem fully interpretable later
238          * without matching up the same kernel and hardware config to see
239          * what PC values meant.
240          */
241         rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
242                                      VM_READ|VM_EXEC|
243                                      VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
244                                      VM_ALWAYSDUMP,
245                                      vdso_pagelist);
246         if (rc)
247                 goto fail_mmapsem;
248
249         /* Put vDSO base into mm struct */
250         current->mm->context.vdso_base = vdso_base;
251
252         up_write(&mm->mmap_sem);
253         return 0;
254
255  fail_mmapsem:
256         up_write(&mm->mmap_sem);
257         return rc;
258 }
259
260 const char *arch_vma_name(struct vm_area_struct *vma)
261 {
262         if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
263                 return "[vdso]";
264         return NULL;
265 }
266
267
268
269 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
270                                   unsigned long *size)
271 {
272         Elf32_Shdr *sechdrs;
273         unsigned int i;
274         char *secnames;
275
276         /* Grab section headers and strings so we can tell who is who */
277         sechdrs = (void *)ehdr + ehdr->e_shoff;
278         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
279
280         /* Find the section they want */
281         for (i = 1; i < ehdr->e_shnum; i++) {
282                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
283                         if (size)
284                                 *size = sechdrs[i].sh_size;
285                         return (void *)ehdr + sechdrs[i].sh_offset;
286                 }
287         }
288         *size = 0;
289         return NULL;
290 }
291
292 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
293                                         const char *symname)
294 {
295         unsigned int i;
296         char name[MAX_SYMNAME], *c;
297
298         for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
299                 if (lib->dynsym[i].st_name == 0)
300                         continue;
301                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
302                         MAX_SYMNAME);
303                 c = strchr(name, '@');
304                 if (c)
305                         *c = 0;
306                 if (strcmp(symname, name) == 0)
307                         return &lib->dynsym[i];
308         }
309         return NULL;
310 }
311
312 /* Note that we assume the section is .text and the symbol is relative to
313  * the library base
314  */
315 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
316                                             const char *symname)
317 {
318         Elf32_Sym *sym = find_symbol32(lib, symname);
319
320         if (sym == NULL) {
321                 printk(KERN_WARNING "vDSO32: function %s not found !\n",
322                        symname);
323                 return 0;
324         }
325         return sym->st_value - VDSO32_LBASE;
326 }
327
328 static int vdso_do_func_patch32(struct lib32_elfinfo *v32,
329                                 struct lib64_elfinfo *v64,
330                                 const char *orig, const char *fix)
331 {
332         Elf32_Sym *sym32_gen, *sym32_fix;
333
334         sym32_gen = find_symbol32(v32, orig);
335         if (sym32_gen == NULL) {
336                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
337                 return -1;
338         }
339         if (fix == NULL) {
340                 sym32_gen->st_name = 0;
341                 return 0;
342         }
343         sym32_fix = find_symbol32(v32, fix);
344         if (sym32_fix == NULL) {
345                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
346                 return -1;
347         }
348         sym32_gen->st_value = sym32_fix->st_value;
349         sym32_gen->st_size = sym32_fix->st_size;
350         sym32_gen->st_info = sym32_fix->st_info;
351         sym32_gen->st_other = sym32_fix->st_other;
352         sym32_gen->st_shndx = sym32_fix->st_shndx;
353
354         return 0;
355 }
356
357
358 #ifdef CONFIG_PPC64
359
360 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
361                                   unsigned long *size)
362 {
363         Elf64_Shdr *sechdrs;
364         unsigned int i;
365         char *secnames;
366
367         /* Grab section headers and strings so we can tell who is who */
368         sechdrs = (void *)ehdr + ehdr->e_shoff;
369         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
370
371         /* Find the section they want */
372         for (i = 1; i < ehdr->e_shnum; i++) {
373                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
374                         if (size)
375                                 *size = sechdrs[i].sh_size;
376                         return (void *)ehdr + sechdrs[i].sh_offset;
377                 }
378         }
379         if (size)
380                 *size = 0;
381         return NULL;
382 }
383
384 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
385                                         const char *symname)
386 {
387         unsigned int i;
388         char name[MAX_SYMNAME], *c;
389
390         for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
391                 if (lib->dynsym[i].st_name == 0)
392                         continue;
393                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
394                         MAX_SYMNAME);
395                 c = strchr(name, '@');
396                 if (c)
397                         *c = 0;
398                 if (strcmp(symname, name) == 0)
399                         return &lib->dynsym[i];
400         }
401         return NULL;
402 }
403
404 /* Note that we assume the section is .text and the symbol is relative to
405  * the library base
406  */
407 static unsigned long __init find_function64(struct lib64_elfinfo *lib,
408                                             const char *symname)
409 {
410         Elf64_Sym *sym = find_symbol64(lib, symname);
411
412         if (sym == NULL) {
413                 printk(KERN_WARNING "vDSO64: function %s not found !\n",
414                        symname);
415                 return 0;
416         }
417 #ifdef VDS64_HAS_DESCRIPTORS
418         return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
419                 VDSO64_LBASE;
420 #else
421         return sym->st_value - VDSO64_LBASE;
422 #endif
423 }
424
425 static int vdso_do_func_patch64(struct lib32_elfinfo *v32,
426                                 struct lib64_elfinfo *v64,
427                                 const char *orig, const char *fix)
428 {
429         Elf64_Sym *sym64_gen, *sym64_fix;
430
431         sym64_gen = find_symbol64(v64, orig);
432         if (sym64_gen == NULL) {
433                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
434                 return -1;
435         }
436         if (fix == NULL) {
437                 sym64_gen->st_name = 0;
438                 return 0;
439         }
440         sym64_fix = find_symbol64(v64, fix);
441         if (sym64_fix == NULL) {
442                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
443                 return -1;
444         }
445         sym64_gen->st_value = sym64_fix->st_value;
446         sym64_gen->st_size = sym64_fix->st_size;
447         sym64_gen->st_info = sym64_fix->st_info;
448         sym64_gen->st_other = sym64_fix->st_other;
449         sym64_gen->st_shndx = sym64_fix->st_shndx;
450
451         return 0;
452 }
453
454 #endif /* CONFIG_PPC64 */
455
456
457 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
458                                         struct lib64_elfinfo *v64)
459 {
460         void *sect;
461
462         /*
463          * Locate symbol tables & text section
464          */
465
466         v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
467         v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
468         if (v32->dynsym == NULL || v32->dynstr == NULL) {
469                 printk(KERN_ERR "vDSO32: required symbol section not found\n");
470                 return -1;
471         }
472         sect = find_section32(v32->hdr, ".text", NULL);
473         if (sect == NULL) {
474                 printk(KERN_ERR "vDSO32: the .text section was not found\n");
475                 return -1;
476         }
477         v32->text = sect - vdso32_kbase;
478
479 #ifdef CONFIG_PPC64
480         v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
481         v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
482         if (v64->dynsym == NULL || v64->dynstr == NULL) {
483                 printk(KERN_ERR "vDSO64: required symbol section not found\n");
484                 return -1;
485         }
486         sect = find_section64(v64->hdr, ".text", NULL);
487         if (sect == NULL) {
488                 printk(KERN_ERR "vDSO64: the .text section was not found\n");
489                 return -1;
490         }
491         v64->text = sect - vdso64_kbase;
492 #endif /* CONFIG_PPC64 */
493
494         return 0;
495 }
496
497 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
498                                           struct lib64_elfinfo *v64)
499 {
500         /*
501          * Find signal trampolines
502          */
503
504 #ifdef CONFIG_PPC64
505         vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
506 #endif
507         vdso32_sigtramp    = find_function32(v32, "__kernel_sigtramp32");
508         vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
509 }
510
511 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
512                                        struct lib64_elfinfo *v64)
513 {
514         Elf32_Sym *sym32;
515 #ifdef CONFIG_PPC64
516         Elf64_Sym *sym64;
517
518         sym64 = find_symbol64(v64, "__kernel_datapage_offset");
519         if (sym64 == NULL) {
520                 printk(KERN_ERR "vDSO64: Can't find symbol "
521                        "__kernel_datapage_offset !\n");
522                 return -1;
523         }
524         *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
525                 (vdso64_pages << PAGE_SHIFT) -
526                 (sym64->st_value - VDSO64_LBASE);
527 #endif /* CONFIG_PPC64 */
528
529         sym32 = find_symbol32(v32, "__kernel_datapage_offset");
530         if (sym32 == NULL) {
531                 printk(KERN_ERR "vDSO32: Can't find symbol "
532                        "__kernel_datapage_offset !\n");
533                 return -1;
534         }
535         *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
536                 (vdso32_pages << PAGE_SHIFT) -
537                 (sym32->st_value - VDSO32_LBASE);
538
539         return 0;
540 }
541
542
543 static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
544                                       struct lib64_elfinfo *v64)
545 {
546         void *start32;
547         unsigned long size32;
548
549 #ifdef CONFIG_PPC64
550         void *start64;
551         unsigned long size64;
552
553         start64 = find_section64(v64->hdr, "__ftr_fixup", &size64);
554         if (start64)
555                 do_feature_fixups(cur_cpu_spec->cpu_features,
556                                   start64, start64 + size64);
557
558         start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64);
559         if (start64)
560                 do_feature_fixups(powerpc_firmware_features,
561                                   start64, start64 + size64);
562 #endif /* CONFIG_PPC64 */
563
564         start32 = find_section32(v32->hdr, "__ftr_fixup", &size32);
565         if (start32)
566                 do_feature_fixups(cur_cpu_spec->cpu_features,
567                                   start32, start32 + size32);
568
569 #ifdef CONFIG_PPC64
570         start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32);
571         if (start32)
572                 do_feature_fixups(powerpc_firmware_features,
573                                   start32, start32 + size32);
574 #endif /* CONFIG_PPC64 */
575
576         return 0;
577 }
578
579 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
580                                        struct lib64_elfinfo *v64)
581 {
582         int i;
583
584         for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
585                 struct vdso_patch_def *patch = &vdso_patches[i];
586                 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
587                         == patch->ftr_value;
588                 if (!match)
589                         continue;
590
591                 DBG("replacing %s with %s...\n", patch->gen_name,
592                     patch->fix_name ? "NONE" : patch->fix_name);
593
594                 /*
595                  * Patch the 32 bits and 64 bits symbols. Note that we do not
596                  * patch the "." symbol on 64 bits.
597                  * It would be easy to do, but doesn't seem to be necessary,
598                  * patching the OPD symbol is enough.
599                  */
600                 vdso_do_func_patch32(v32, v64, patch->gen_name,
601                                      patch->fix_name);
602 #ifdef CONFIG_PPC64
603                 vdso_do_func_patch64(v32, v64, patch->gen_name,
604                                      patch->fix_name);
605 #endif /* CONFIG_PPC64 */
606         }
607
608         return 0;
609 }
610
611
612 static __init int vdso_setup(void)
613 {
614         struct lib32_elfinfo    v32;
615         struct lib64_elfinfo    v64;
616
617         v32.hdr = vdso32_kbase;
618 #ifdef CONFIG_PPC64
619         v64.hdr = vdso64_kbase;
620 #endif
621         if (vdso_do_find_sections(&v32, &v64))
622                 return -1;
623
624         if (vdso_fixup_datapage(&v32, &v64))
625                 return -1;
626
627         if (vdso_fixup_features(&v32, &v64))
628                 return -1;
629
630         if (vdso_fixup_alt_funcs(&v32, &v64))
631                 return -1;
632
633         vdso_setup_trampolines(&v32, &v64);
634
635         return 0;
636 }
637
638 /*
639  * Called from setup_arch to initialize the bitmap of available
640  * syscalls in the systemcfg page
641  */
642 static void __init vdso_setup_syscall_map(void)
643 {
644         unsigned int i;
645         extern unsigned long *sys_call_table;
646         extern unsigned long sys_ni_syscall;
647
648
649         for (i = 0; i < __NR_syscalls; i++) {
650 #ifdef CONFIG_PPC64
651                 if (sys_call_table[i*2] != sys_ni_syscall)
652                         vdso_data->syscall_map_64[i >> 5] |=
653                                 0x80000000UL >> (i & 0x1f);
654                 if (sys_call_table[i*2+1] != sys_ni_syscall)
655                         vdso_data->syscall_map_32[i >> 5] |=
656                                 0x80000000UL >> (i & 0x1f);
657 #else /* CONFIG_PPC64 */
658                 if (sys_call_table[i] != sys_ni_syscall)
659                         vdso_data->syscall_map_32[i >> 5] |=
660                                 0x80000000UL >> (i & 0x1f);
661 #endif /* CONFIG_PPC64 */
662         }
663 }
664
665
666 static int __init vdso_init(void)
667 {
668         int i;
669
670 #ifdef CONFIG_PPC64
671         /*
672          * Fill up the "systemcfg" stuff for backward compatiblity
673          */
674         strcpy(vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
675         vdso_data->version.major = SYSTEMCFG_MAJOR;
676         vdso_data->version.minor = SYSTEMCFG_MINOR;
677         vdso_data->processor = mfspr(SPRN_PVR);
678         /*
679          * Fake the old platform number for pSeries and iSeries and add
680          * in LPAR bit if necessary
681          */
682         vdso_data->platform = machine_is(iseries) ? 0x200 : 0x100;
683         if (firmware_has_feature(FW_FEATURE_LPAR))
684                 vdso_data->platform |= 1;
685         vdso_data->physicalMemorySize = lmb_phys_mem_size();
686         vdso_data->dcache_size = ppc64_caches.dsize;
687         vdso_data->dcache_line_size = ppc64_caches.dline_size;
688         vdso_data->icache_size = ppc64_caches.isize;
689         vdso_data->icache_line_size = ppc64_caches.iline_size;
690
691         /*
692          * Calculate the size of the 64 bits vDSO
693          */
694         vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
695         DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
696 #endif /* CONFIG_PPC64 */
697
698
699         /*
700          * Calculate the size of the 32 bits vDSO
701          */
702         vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
703         DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
704
705
706         /*
707          * Setup the syscall map in the vDOS
708          */
709         vdso_setup_syscall_map();
710
711         /*
712          * Initialize the vDSO images in memory, that is do necessary
713          * fixups of vDSO symbols, locate trampolines, etc...
714          */
715         if (vdso_setup()) {
716                 printk(KERN_ERR "vDSO setup failure, not enabled !\n");
717                 vdso32_pages = 0;
718 #ifdef CONFIG_PPC64
719                 vdso64_pages = 0;
720 #endif
721                 return 0;
722         }
723
724         /* Make sure pages are in the correct state */
725         vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2),
726                                   GFP_KERNEL);
727         BUG_ON(vdso32_pagelist == NULL);
728         for (i = 0; i < vdso32_pages; i++) {
729                 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
730                 ClearPageReserved(pg);
731                 get_page(pg);
732                 vdso32_pagelist[i] = pg;
733         }
734         vdso32_pagelist[i++] = virt_to_page(vdso_data);
735         vdso32_pagelist[i] = NULL;
736
737 #ifdef CONFIG_PPC64
738         vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2),
739                                   GFP_KERNEL);
740         BUG_ON(vdso64_pagelist == NULL);
741         for (i = 0; i < vdso64_pages; i++) {
742                 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
743                 ClearPageReserved(pg);
744                 get_page(pg);
745                 vdso64_pagelist[i] = pg;
746         }
747         vdso64_pagelist[i++] = virt_to_page(vdso_data);
748         vdso64_pagelist[i] = NULL;
749 #endif /* CONFIG_PPC64 */
750
751         get_page(virt_to_page(vdso_data));
752
753         smp_wmb();
754         vdso_ready = 1;
755
756         return 0;
757 }
758 arch_initcall(vdso_init);
759
760 int in_gate_area_no_task(unsigned long addr)
761 {
762         return 0;
763 }
764
765 int in_gate_area(struct task_struct *task, unsigned long addr)
766 {
767         return 0;
768 }
769
770 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
771 {
772         return NULL;
773 }
774