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/config.h>
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/smp_lock.h>
19 #include <linux/stddef.h>
20 #include <linux/unistd.h>
21 #include <linux/slab.h>
22 #include <linux/user.h>
23 #include <linux/elf.h>
24 #include <linux/security.h>
25 #include <linux/bootmem.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/lmb.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 #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 unsigned int vdso32_pages;
54 unsigned long vdso32_sigtramp;
55 unsigned long vdso32_rt_sigtramp;
56
57 #ifdef CONFIG_PPC64
58 extern char vdso64_start, vdso64_end;
59 static void *vdso64_kbase = &vdso64_start;
60 unsigned int vdso64_pages;
61 unsigned long vdso64_rt_sigtramp;
62 #endif /* CONFIG_PPC64 */
63
64 /*
65  * The vdso data page (aka. systemcfg for old ppc64 fans) is here.
66  * Once the early boot kernel code no longer needs to muck around
67  * with it, it will become dynamically allocated
68  */
69 static union {
70         struct vdso_data        data;
71         u8                      page[PAGE_SIZE];
72 } vdso_data_store __attribute__((__section__(".data.page_aligned")));
73 struct vdso_data *vdso_data = &vdso_data_store.data;
74
75 /* Format of the patch table */
76 struct vdso_patch_def
77 {
78         unsigned long   ftr_mask, ftr_value;
79         const char      *gen_name;
80         const char      *fix_name;
81 };
82
83 /* Table of functions to patch based on the CPU type/revision
84  *
85  * Currently, we only change sync_dicache to do nothing on processors
86  * with a coherent icache
87  */
88 static struct vdso_patch_def vdso_patches[] = {
89         {
90                 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
91                 "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
92         },
93         {
94                 CPU_FTR_USE_TB, 0,
95                 "__kernel_gettimeofday", NULL
96         },
97 };
98
99 /*
100  * Some infos carried around for each of them during parsing at
101  * boot time.
102  */
103 struct lib32_elfinfo
104 {
105         Elf32_Ehdr      *hdr;           /* ptr to ELF */
106         Elf32_Sym       *dynsym;        /* ptr to .dynsym section */
107         unsigned long   dynsymsize;     /* size of .dynsym section */
108         char            *dynstr;        /* ptr to .dynstr section */
109         unsigned long   text;           /* offset of .text section in .so */
110 };
111
112 struct lib64_elfinfo
113 {
114         Elf64_Ehdr      *hdr;
115         Elf64_Sym       *dynsym;
116         unsigned long   dynsymsize;
117         char            *dynstr;
118         unsigned long   text;
119 };
120
121
122 #ifdef __DEBUG
123 static void dump_one_vdso_page(struct page *pg, struct page *upg)
124 {
125         printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT),
126                page_count(pg),
127                pg->flags);
128         if (upg/* && pg != upg*/) {
129                 printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg)
130                                                        << PAGE_SHIFT),
131                        page_count(upg),
132                        upg->flags);
133         }
134         printk("\n");
135 }
136
137 static void dump_vdso_pages(struct vm_area_struct * vma)
138 {
139         int i;
140
141         if (!vma || test_thread_flag(TIF_32BIT)) {
142                 printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase);
143                 for (i=0; i<vdso32_pages; i++) {
144                         struct page *pg = virt_to_page(vdso32_kbase +
145                                                        i*PAGE_SIZE);
146                         struct page *upg = (vma && vma->vm_mm) ?
147                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
148                                 : NULL;
149                         dump_one_vdso_page(pg, upg);
150                 }
151         }
152         if (!vma || !test_thread_flag(TIF_32BIT)) {
153                 printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase);
154                 for (i=0; i<vdso64_pages; i++) {
155                         struct page *pg = virt_to_page(vdso64_kbase +
156                                                        i*PAGE_SIZE);
157                         struct page *upg = (vma && vma->vm_mm) ?
158                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
159                                 : NULL;
160                         dump_one_vdso_page(pg, upg);
161                 }
162         }
163 }
164 #endif /* DEBUG */
165
166 /*
167  * Keep a dummy vma_close for now, it will prevent VMA merging.
168  */
169 static void vdso_vma_close(struct vm_area_struct * vma)
170 {
171 }
172
173 /*
174  * Our nopage() function, maps in the actual vDSO kernel pages, they will
175  * be mapped read-only by do_no_page(), and eventually COW'ed, either
176  * right away for an initial write access, or by do_wp_page().
177  */
178 static struct page * vdso_vma_nopage(struct vm_area_struct * vma,
179                                      unsigned long address, int *type)
180 {
181         unsigned long offset = address - vma->vm_start;
182         struct page *pg;
183 #ifdef CONFIG_PPC64
184         void *vbase = (vma->vm_mm->task_size > TASK_SIZE_USER32) ?
185                 vdso64_kbase : vdso32_kbase;
186 #else
187         void *vbase = vdso32_kbase;
188 #endif
189
190         DBG("vdso_vma_nopage(current: %s, address: %016lx, off: %lx)\n",
191             current->comm, address, offset);
192
193         if (address < vma->vm_start || address > vma->vm_end)
194                 return NOPAGE_SIGBUS;
195
196         /*
197          * Last page is systemcfg.
198          */
199         if ((vma->vm_end - address) <= PAGE_SIZE)
200                 pg = virt_to_page(vdso_data);
201         else
202                 pg = virt_to_page(vbase + offset);
203
204         get_page(pg);
205         DBG(" ->page count: %d\n", page_count(pg));
206
207         return pg;
208 }
209
210 static struct vm_operations_struct vdso_vmops = {
211         .close  = vdso_vma_close,
212         .nopage = vdso_vma_nopage,
213 };
214
215 /*
216  * This is called from binfmt_elf, we create the special vma for the
217  * vDSO and insert it into the mm struct tree
218  */
219 int arch_setup_additional_pages(struct linux_binprm *bprm,
220                                 int executable_stack)
221 {
222         struct mm_struct *mm = current->mm;
223         struct vm_area_struct *vma;
224         unsigned long vdso_pages;
225         unsigned long vdso_base;
226         int rc;
227
228 #ifdef CONFIG_PPC64
229         if (test_thread_flag(TIF_32BIT)) {
230                 vdso_pages = vdso32_pages;
231                 vdso_base = VDSO32_MBASE;
232         } else {
233                 vdso_pages = vdso64_pages;
234                 vdso_base = VDSO64_MBASE;
235         }
236 #else
237         vdso_pages = vdso32_pages;
238         vdso_base = VDSO32_MBASE;
239 #endif
240
241         current->mm->context.vdso_base = 0;
242
243         /* vDSO has a problem and was disabled, just don't "enable" it for the
244          * process
245          */
246         if (vdso_pages == 0)
247                 return 0;
248         /* Add a page to the vdso size for the data page */
249         vdso_pages ++;
250
251         /*
252          * pick a base address for the vDSO in process space. We try to put it
253          * at vdso_base which is the "natural" base for it, but we might fail
254          * and end up putting it elsewhere.
255          */
256         down_write(&mm->mmap_sem);
257         vdso_base = get_unmapped_area(NULL, vdso_base,
258                                       vdso_pages << PAGE_SHIFT, 0, 0);
259         if (IS_ERR_VALUE(vdso_base)) {
260                 rc = vdso_base;
261                 goto fail_mmapsem;
262         }
263
264
265         /* Allocate a VMA structure and fill it up */
266         vma = kmem_cache_zalloc(vm_area_cachep, SLAB_KERNEL);
267         if (vma == NULL) {
268                 rc = -ENOMEM;
269                 goto fail_mmapsem;
270         }
271         vma->vm_mm = mm;
272         vma->vm_start = vdso_base;
273         vma->vm_end = vma->vm_start + (vdso_pages << PAGE_SHIFT);
274
275         /*
276          * our vma flags don't have VM_WRITE so by default, the process isn't
277          * allowed to write those pages.
278          * gdb can break that with ptrace interface, and thus trigger COW on
279          * those pages but it's then your responsibility to never do that on
280          * the "data" page of the vDSO or you'll stop getting kernel updates
281          * and your nice userland gettimeofday will be totally dead.
282          * It's fine to use that for setting breakpoints in the vDSO code
283          * pages though
284          */
285         vma->vm_flags = VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC;
286         vma->vm_flags |= mm->def_flags;
287         vma->vm_page_prot = protection_map[vma->vm_flags & 0x7];
288         vma->vm_ops = &vdso_vmops;
289
290         /* Insert new VMA */
291         rc = insert_vm_struct(mm, vma);
292         if (rc)
293                 goto fail_vma;
294
295         /* Put vDSO base into mm struct and account for memory usage */
296         current->mm->context.vdso_base = vdso_base;
297         mm->total_vm += (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
298         up_write(&mm->mmap_sem);
299         return 0;
300
301  fail_vma:
302         kmem_cache_free(vm_area_cachep, vma);
303  fail_mmapsem:
304         up_write(&mm->mmap_sem);
305         return rc;
306 }
307
308 const char *arch_vma_name(struct vm_area_struct *vma)
309 {
310         if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
311                 return "[vdso]";
312         return NULL;
313 }
314
315
316
317 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
318                                   unsigned long *size)
319 {
320         Elf32_Shdr *sechdrs;
321         unsigned int i;
322         char *secnames;
323
324         /* Grab section headers and strings so we can tell who is who */
325         sechdrs = (void *)ehdr + ehdr->e_shoff;
326         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
327
328         /* Find the section they want */
329         for (i = 1; i < ehdr->e_shnum; i++) {
330                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
331                         if (size)
332                                 *size = sechdrs[i].sh_size;
333                         return (void *)ehdr + sechdrs[i].sh_offset;
334                 }
335         }
336         *size = 0;
337         return NULL;
338 }
339
340 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
341                                         const char *symname)
342 {
343         unsigned int i;
344         char name[MAX_SYMNAME], *c;
345
346         for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
347                 if (lib->dynsym[i].st_name == 0)
348                         continue;
349                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
350                         MAX_SYMNAME);
351                 c = strchr(name, '@');
352                 if (c)
353                         *c = 0;
354                 if (strcmp(symname, name) == 0)
355                         return &lib->dynsym[i];
356         }
357         return NULL;
358 }
359
360 /* Note that we assume the section is .text and the symbol is relative to
361  * the library base
362  */
363 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
364                                             const char *symname)
365 {
366         Elf32_Sym *sym = find_symbol32(lib, symname);
367
368         if (sym == NULL) {
369                 printk(KERN_WARNING "vDSO32: function %s not found !\n",
370                        symname);
371                 return 0;
372         }
373         return sym->st_value - VDSO32_LBASE;
374 }
375
376 static int vdso_do_func_patch32(struct lib32_elfinfo *v32,
377                                 struct lib64_elfinfo *v64,
378                                 const char *orig, const char *fix)
379 {
380         Elf32_Sym *sym32_gen, *sym32_fix;
381
382         sym32_gen = find_symbol32(v32, orig);
383         if (sym32_gen == NULL) {
384                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
385                 return -1;
386         }
387         if (fix == NULL) {
388                 sym32_gen->st_name = 0;
389                 return 0;
390         }
391         sym32_fix = find_symbol32(v32, fix);
392         if (sym32_fix == NULL) {
393                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
394                 return -1;
395         }
396         sym32_gen->st_value = sym32_fix->st_value;
397         sym32_gen->st_size = sym32_fix->st_size;
398         sym32_gen->st_info = sym32_fix->st_info;
399         sym32_gen->st_other = sym32_fix->st_other;
400         sym32_gen->st_shndx = sym32_fix->st_shndx;
401
402         return 0;
403 }
404
405
406 #ifdef CONFIG_PPC64
407
408 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
409                                   unsigned long *size)
410 {
411         Elf64_Shdr *sechdrs;
412         unsigned int i;
413         char *secnames;
414
415         /* Grab section headers and strings so we can tell who is who */
416         sechdrs = (void *)ehdr + ehdr->e_shoff;
417         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
418
419         /* Find the section they want */
420         for (i = 1; i < ehdr->e_shnum; i++) {
421                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
422                         if (size)
423                                 *size = sechdrs[i].sh_size;
424                         return (void *)ehdr + sechdrs[i].sh_offset;
425                 }
426         }
427         if (size)
428                 *size = 0;
429         return NULL;
430 }
431
432 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
433                                         const char *symname)
434 {
435         unsigned int i;
436         char name[MAX_SYMNAME], *c;
437
438         for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
439                 if (lib->dynsym[i].st_name == 0)
440                         continue;
441                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
442                         MAX_SYMNAME);
443                 c = strchr(name, '@');
444                 if (c)
445                         *c = 0;
446                 if (strcmp(symname, name) == 0)
447                         return &lib->dynsym[i];
448         }
449         return NULL;
450 }
451
452 /* Note that we assume the section is .text and the symbol is relative to
453  * the library base
454  */
455 static unsigned long __init find_function64(struct lib64_elfinfo *lib,
456                                             const char *symname)
457 {
458         Elf64_Sym *sym = find_symbol64(lib, symname);
459
460         if (sym == NULL) {
461                 printk(KERN_WARNING "vDSO64: function %s not found !\n",
462                        symname);
463                 return 0;
464         }
465 #ifdef VDS64_HAS_DESCRIPTORS
466         return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
467                 VDSO64_LBASE;
468 #else
469         return sym->st_value - VDSO64_LBASE;
470 #endif
471 }
472
473 static int vdso_do_func_patch64(struct lib32_elfinfo *v32,
474                                 struct lib64_elfinfo *v64,
475                                 const char *orig, const char *fix)
476 {
477         Elf64_Sym *sym64_gen, *sym64_fix;
478
479         sym64_gen = find_symbol64(v64, orig);
480         if (sym64_gen == NULL) {
481                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
482                 return -1;
483         }
484         if (fix == NULL) {
485                 sym64_gen->st_name = 0;
486                 return 0;
487         }
488         sym64_fix = find_symbol64(v64, fix);
489         if (sym64_fix == NULL) {
490                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
491                 return -1;
492         }
493         sym64_gen->st_value = sym64_fix->st_value;
494         sym64_gen->st_size = sym64_fix->st_size;
495         sym64_gen->st_info = sym64_fix->st_info;
496         sym64_gen->st_other = sym64_fix->st_other;
497         sym64_gen->st_shndx = sym64_fix->st_shndx;
498
499         return 0;
500 }
501
502 #endif /* CONFIG_PPC64 */
503
504
505 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
506                                         struct lib64_elfinfo *v64)
507 {
508         void *sect;
509
510         /*
511          * Locate symbol tables & text section
512          */
513
514         v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
515         v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
516         if (v32->dynsym == NULL || v32->dynstr == NULL) {
517                 printk(KERN_ERR "vDSO32: required symbol section not found\n");
518                 return -1;
519         }
520         sect = find_section32(v32->hdr, ".text", NULL);
521         if (sect == NULL) {
522                 printk(KERN_ERR "vDSO32: the .text section was not found\n");
523                 return -1;
524         }
525         v32->text = sect - vdso32_kbase;
526
527 #ifdef CONFIG_PPC64
528         v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
529         v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
530         if (v64->dynsym == NULL || v64->dynstr == NULL) {
531                 printk(KERN_ERR "vDSO64: required symbol section not found\n");
532                 return -1;
533         }
534         sect = find_section64(v64->hdr, ".text", NULL);
535         if (sect == NULL) {
536                 printk(KERN_ERR "vDSO64: the .text section was not found\n");
537                 return -1;
538         }
539         v64->text = sect - vdso64_kbase;
540 #endif /* CONFIG_PPC64 */
541
542         return 0;
543 }
544
545 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
546                                           struct lib64_elfinfo *v64)
547 {
548         /*
549          * Find signal trampolines
550          */
551
552 #ifdef CONFIG_PPC64
553         vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
554 #endif
555         vdso32_sigtramp    = find_function32(v32, "__kernel_sigtramp32");
556         vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
557 }
558
559 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
560                                        struct lib64_elfinfo *v64)
561 {
562         Elf32_Sym *sym32;
563 #ifdef CONFIG_PPC64
564         Elf64_Sym *sym64;
565
566         sym64 = find_symbol64(v64, "__kernel_datapage_offset");
567         if (sym64 == NULL) {
568                 printk(KERN_ERR "vDSO64: Can't find symbol "
569                        "__kernel_datapage_offset !\n");
570                 return -1;
571         }
572         *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
573                 (vdso64_pages << PAGE_SHIFT) -
574                 (sym64->st_value - VDSO64_LBASE);
575 #endif /* CONFIG_PPC64 */
576
577         sym32 = find_symbol32(v32, "__kernel_datapage_offset");
578         if (sym32 == NULL) {
579                 printk(KERN_ERR "vDSO32: Can't find symbol "
580                        "__kernel_datapage_offset !\n");
581                 return -1;
582         }
583         *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
584                 (vdso32_pages << PAGE_SHIFT) -
585                 (sym32->st_value - VDSO32_LBASE);
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_alt_funcs(&v32, &v64))
639                 return -1;
640
641         vdso_setup_trampolines(&v32, &v64);
642
643         return 0;
644 }
645
646 /*
647  * Called from setup_arch to initialize the bitmap of available
648  * syscalls in the systemcfg page
649  */
650 static void __init vdso_setup_syscall_map(void)
651 {
652         unsigned int i;
653         extern unsigned long *sys_call_table;
654         extern unsigned long sys_ni_syscall;
655
656
657         for (i = 0; i < __NR_syscalls; i++) {
658 #ifdef CONFIG_PPC64
659                 if (sys_call_table[i*2] != sys_ni_syscall)
660                         vdso_data->syscall_map_64[i >> 5] |=
661                                 0x80000000UL >> (i & 0x1f);
662                 if (sys_call_table[i*2+1] != sys_ni_syscall)
663                         vdso_data->syscall_map_32[i >> 5] |=
664                                 0x80000000UL >> (i & 0x1f);
665 #else /* CONFIG_PPC64 */
666                 if (sys_call_table[i] != sys_ni_syscall)
667                         vdso_data->syscall_map_32[i >> 5] |=
668                                 0x80000000UL >> (i & 0x1f);
669 #endif /* CONFIG_PPC64 */
670         }
671 }
672
673
674 void __init vdso_init(void)
675 {
676         int i;
677
678 #ifdef CONFIG_PPC64
679         /*
680          * Fill up the "systemcfg" stuff for backward compatiblity
681          */
682         strcpy(vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
683         vdso_data->version.major = SYSTEMCFG_MAJOR;
684         vdso_data->version.minor = SYSTEMCFG_MINOR;
685         vdso_data->processor = mfspr(SPRN_PVR);
686         /*
687          * Fake the old platform number for pSeries and iSeries and add
688          * in LPAR bit if necessary
689          */
690         vdso_data->platform = machine_is(iseries) ? 0x200 : 0x100;
691         if (firmware_has_feature(FW_FEATURE_LPAR))
692                 vdso_data->platform |= 1;
693         vdso_data->physicalMemorySize = lmb_phys_mem_size();
694         vdso_data->dcache_size = ppc64_caches.dsize;
695         vdso_data->dcache_line_size = ppc64_caches.dline_size;
696         vdso_data->icache_size = ppc64_caches.isize;
697         vdso_data->icache_line_size = ppc64_caches.iline_size;
698
699         /*
700          * Calculate the size of the 64 bits vDSO
701          */
702         vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
703         DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
704 #endif /* CONFIG_PPC64 */
705
706
707         /*
708          * Calculate the size of the 32 bits vDSO
709          */
710         vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
711         DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
712
713
714         /*
715          * Setup the syscall map in the vDOS
716          */
717         vdso_setup_syscall_map();
718         /*
719          * Initialize the vDSO images in memory, that is do necessary
720          * fixups of vDSO symbols, locate trampolines, etc...
721          */
722         if (vdso_setup()) {
723                 printk(KERN_ERR "vDSO setup failure, not enabled !\n");
724                 vdso32_pages = 0;
725 #ifdef CONFIG_PPC64
726                 vdso64_pages = 0;
727 #endif
728                 return;
729         }
730
731         /* Make sure pages are in the correct state */
732         for (i = 0; i < vdso32_pages; i++) {
733                 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
734                 ClearPageReserved(pg);
735                 get_page(pg);
736
737         }
738 #ifdef CONFIG_PPC64
739         for (i = 0; i < vdso64_pages; i++) {
740                 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
741                 ClearPageReserved(pg);
742                 get_page(pg);
743         }
744 #endif /* CONFIG_PPC64 */
745
746         get_page(virt_to_page(vdso_data));
747 }
748
749 int in_gate_area_no_task(unsigned long addr)
750 {
751         return 0;
752 }
753
754 int in_gate_area(struct task_struct *task, unsigned long addr)
755 {
756         return 0;
757 }
758
759 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
760 {
761         return NULL;
762 }
763