Pull acpi_device_handle_cleanup 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 #undef DEBUG
40
41 #ifdef DEBUG
42 #define DBG(fmt...) printk(fmt)
43 #else
44 #define DBG(fmt...)
45 #endif
46
47 /* Max supported size for symbol names */
48 #define MAX_SYMNAME     64
49
50 extern char vdso32_start, vdso32_end;
51 static void *vdso32_kbase = &vdso32_start;
52 unsigned int vdso32_pages;
53 unsigned long vdso32_sigtramp;
54 unsigned long vdso32_rt_sigtramp;
55
56 #ifdef CONFIG_PPC64
57 extern char vdso64_start, vdso64_end;
58 static void *vdso64_kbase = &vdso64_start;
59 unsigned int vdso64_pages;
60 unsigned long vdso64_rt_sigtramp;
61 #endif /* CONFIG_PPC64 */
62
63 /*
64  * The vdso data page (aka. systemcfg for old ppc64 fans) is here.
65  * Once the early boot kernel code no longer needs to muck around
66  * with it, it will become dynamically allocated
67  */
68 static union {
69         struct vdso_data        data;
70         u8                      page[PAGE_SIZE];
71 } vdso_data_store __attribute__((__section__(".data.page_aligned")));
72 struct vdso_data *vdso_data = &vdso_data_store.data;
73
74 /* Format of the patch table */
75 struct vdso_patch_def
76 {
77         unsigned long   ftr_mask, ftr_value;
78         const char      *gen_name;
79         const char      *fix_name;
80 };
81
82 /* Table of functions to patch based on the CPU type/revision
83  *
84  * Currently, we only change sync_dicache to do nothing on processors
85  * with a coherent icache
86  */
87 static struct vdso_patch_def vdso_patches[] = {
88         {
89                 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
90                 "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
91         },
92         {
93                 CPU_FTR_USE_TB, 0,
94                 "__kernel_gettimeofday", NULL
95         },
96 };
97
98 /*
99  * Some infos carried around for each of them during parsing at
100  * boot time.
101  */
102 struct lib32_elfinfo
103 {
104         Elf32_Ehdr      *hdr;           /* ptr to ELF */
105         Elf32_Sym       *dynsym;        /* ptr to .dynsym section */
106         unsigned long   dynsymsize;     /* size of .dynsym section */
107         char            *dynstr;        /* ptr to .dynstr section */
108         unsigned long   text;           /* offset of .text section in .so */
109 };
110
111 struct lib64_elfinfo
112 {
113         Elf64_Ehdr      *hdr;
114         Elf64_Sym       *dynsym;
115         unsigned long   dynsymsize;
116         char            *dynstr;
117         unsigned long   text;
118 };
119
120
121 #ifdef __DEBUG
122 static void dump_one_vdso_page(struct page *pg, struct page *upg)
123 {
124         printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT),
125                page_count(pg),
126                pg->flags);
127         if (upg/* && pg != upg*/) {
128                 printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg)
129                                                        << PAGE_SHIFT),
130                        page_count(upg),
131                        upg->flags);
132         }
133         printk("\n");
134 }
135
136 static void dump_vdso_pages(struct vm_area_struct * vma)
137 {
138         int i;
139
140         if (!vma || test_thread_flag(TIF_32BIT)) {
141                 printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase);
142                 for (i=0; i<vdso32_pages; i++) {
143                         struct page *pg = virt_to_page(vdso32_kbase +
144                                                        i*PAGE_SIZE);
145                         struct page *upg = (vma && vma->vm_mm) ?
146                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
147                                 : NULL;
148                         dump_one_vdso_page(pg, upg);
149                 }
150         }
151         if (!vma || !test_thread_flag(TIF_32BIT)) {
152                 printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase);
153                 for (i=0; i<vdso64_pages; i++) {
154                         struct page *pg = virt_to_page(vdso64_kbase +
155                                                        i*PAGE_SIZE);
156                         struct page *upg = (vma && vma->vm_mm) ?
157                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
158                                 : NULL;
159                         dump_one_vdso_page(pg, upg);
160                 }
161         }
162 }
163 #endif /* DEBUG */
164
165 /*
166  * Keep a dummy vma_close for now, it will prevent VMA merging.
167  */
168 static void vdso_vma_close(struct vm_area_struct * vma)
169 {
170 }
171
172 /*
173  * Our nopage() function, maps in the actual vDSO kernel pages, they will
174  * be mapped read-only by do_no_page(), and eventually COW'ed, either
175  * right away for an initial write access, or by do_wp_page().
176  */
177 static struct page * vdso_vma_nopage(struct vm_area_struct * vma,
178                                      unsigned long address, int *type)
179 {
180         unsigned long offset = address - vma->vm_start;
181         struct page *pg;
182 #ifdef CONFIG_PPC64
183         void *vbase = (vma->vm_mm->task_size > TASK_SIZE_USER32) ?
184                 vdso64_kbase : vdso32_kbase;
185 #else
186         void *vbase = vdso32_kbase;
187 #endif
188
189         DBG("vdso_vma_nopage(current: %s, address: %016lx, off: %lx)\n",
190             current->comm, address, offset);
191
192         if (address < vma->vm_start || address > vma->vm_end)
193                 return NOPAGE_SIGBUS;
194
195         /*
196          * Last page is systemcfg.
197          */
198         if ((vma->vm_end - address) <= PAGE_SIZE)
199                 pg = virt_to_page(vdso_data);
200         else
201                 pg = virt_to_page(vbase + offset);
202
203         get_page(pg);
204         DBG(" ->page count: %d\n", page_count(pg));
205
206         return pg;
207 }
208
209 static struct vm_operations_struct vdso_vmops = {
210         .close  = vdso_vma_close,
211         .nopage = vdso_vma_nopage,
212 };
213
214 /*
215  * This is called from binfmt_elf, we create the special vma for the
216  * vDSO and insert it into the mm struct tree
217  */
218 int arch_setup_additional_pages(struct linux_binprm *bprm,
219                                 int executable_stack)
220 {
221         struct mm_struct *mm = current->mm;
222         struct vm_area_struct *vma;
223         unsigned long vdso_pages;
224         unsigned long vdso_base;
225         int rc;
226
227 #ifdef CONFIG_PPC64
228         if (test_thread_flag(TIF_32BIT)) {
229                 vdso_pages = vdso32_pages;
230                 vdso_base = VDSO32_MBASE;
231         } else {
232                 vdso_pages = vdso64_pages;
233                 vdso_base = VDSO64_MBASE;
234         }
235 #else
236         vdso_pages = vdso32_pages;
237         vdso_base = VDSO32_MBASE;
238 #endif
239
240         current->mm->context.vdso_base = 0;
241
242         /* vDSO has a problem and was disabled, just don't "enable" it for the
243          * process
244          */
245         if (vdso_pages == 0)
246                 return 0;
247         /* Add a page to the vdso size for the data page */
248         vdso_pages ++;
249
250         /*
251          * pick a base address for the vDSO in process space. We try to put it
252          * at vdso_base which is the "natural" base for it, but we might fail
253          * and end up putting it elsewhere.
254          */
255         down_write(&mm->mmap_sem);
256         vdso_base = get_unmapped_area(NULL, vdso_base,
257                                       vdso_pages << PAGE_SHIFT, 0, 0);
258         if (IS_ERR_VALUE(vdso_base)) {
259                 rc = vdso_base;
260                 goto fail_mmapsem;
261         }
262
263
264         /* Allocate a VMA structure and fill it up */
265         vma = kmem_cache_zalloc(vm_area_cachep, SLAB_KERNEL);
266         if (vma == NULL) {
267                 rc = -ENOMEM;
268                 goto fail_mmapsem;
269         }
270         vma->vm_mm = mm;
271         vma->vm_start = vdso_base;
272         vma->vm_end = vma->vm_start + (vdso_pages << PAGE_SHIFT);
273
274         /*
275          * our vma flags don't have VM_WRITE so by default, the process isn't
276          * allowed to write those pages.
277          * gdb can break that with ptrace interface, and thus trigger COW on
278          * those pages but it's then your responsibility to never do that on
279          * the "data" page of the vDSO or you'll stop getting kernel updates
280          * and your nice userland gettimeofday will be totally dead.
281          * It's fine to use that for setting breakpoints in the vDSO code
282          * pages though
283          */
284         vma->vm_flags = VM_READ|VM_EXEC|VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC;
285         vma->vm_flags |= mm->def_flags;
286         vma->vm_page_prot = protection_map[vma->vm_flags & 0x7];
287         vma->vm_ops = &vdso_vmops;
288
289         /* Insert new VMA */
290         rc = insert_vm_struct(mm, vma);
291         if (rc)
292                 goto fail_vma;
293
294         /* Put vDSO base into mm struct and account for memory usage */
295         current->mm->context.vdso_base = vdso_base;
296         mm->total_vm += (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
297         up_write(&mm->mmap_sem);
298         return 0;
299
300  fail_vma:
301         kmem_cache_free(vm_area_cachep, vma);
302  fail_mmapsem:
303         up_write(&mm->mmap_sem);
304         return rc;
305 }
306
307 const char *arch_vma_name(struct vm_area_struct *vma)
308 {
309         if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
310                 return "[vdso]";
311         return NULL;
312 }
313
314
315
316 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
317                                   unsigned long *size)
318 {
319         Elf32_Shdr *sechdrs;
320         unsigned int i;
321         char *secnames;
322
323         /* Grab section headers and strings so we can tell who is who */
324         sechdrs = (void *)ehdr + ehdr->e_shoff;
325         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
326
327         /* Find the section they want */
328         for (i = 1; i < ehdr->e_shnum; i++) {
329                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
330                         if (size)
331                                 *size = sechdrs[i].sh_size;
332                         return (void *)ehdr + sechdrs[i].sh_offset;
333                 }
334         }
335         *size = 0;
336         return NULL;
337 }
338
339 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
340                                         const char *symname)
341 {
342         unsigned int i;
343         char name[MAX_SYMNAME], *c;
344
345         for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
346                 if (lib->dynsym[i].st_name == 0)
347                         continue;
348                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
349                         MAX_SYMNAME);
350                 c = strchr(name, '@');
351                 if (c)
352                         *c = 0;
353                 if (strcmp(symname, name) == 0)
354                         return &lib->dynsym[i];
355         }
356         return NULL;
357 }
358
359 /* Note that we assume the section is .text and the symbol is relative to
360  * the library base
361  */
362 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
363                                             const char *symname)
364 {
365         Elf32_Sym *sym = find_symbol32(lib, symname);
366
367         if (sym == NULL) {
368                 printk(KERN_WARNING "vDSO32: function %s not found !\n",
369                        symname);
370                 return 0;
371         }
372         return sym->st_value - VDSO32_LBASE;
373 }
374
375 static int vdso_do_func_patch32(struct lib32_elfinfo *v32,
376                                 struct lib64_elfinfo *v64,
377                                 const char *orig, const char *fix)
378 {
379         Elf32_Sym *sym32_gen, *sym32_fix;
380
381         sym32_gen = find_symbol32(v32, orig);
382         if (sym32_gen == NULL) {
383                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
384                 return -1;
385         }
386         if (fix == NULL) {
387                 sym32_gen->st_name = 0;
388                 return 0;
389         }
390         sym32_fix = find_symbol32(v32, fix);
391         if (sym32_fix == NULL) {
392                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
393                 return -1;
394         }
395         sym32_gen->st_value = sym32_fix->st_value;
396         sym32_gen->st_size = sym32_fix->st_size;
397         sym32_gen->st_info = sym32_fix->st_info;
398         sym32_gen->st_other = sym32_fix->st_other;
399         sym32_gen->st_shndx = sym32_fix->st_shndx;
400
401         return 0;
402 }
403
404
405 #ifdef CONFIG_PPC64
406
407 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
408                                   unsigned long *size)
409 {
410         Elf64_Shdr *sechdrs;
411         unsigned int i;
412         char *secnames;
413
414         /* Grab section headers and strings so we can tell who is who */
415         sechdrs = (void *)ehdr + ehdr->e_shoff;
416         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
417
418         /* Find the section they want */
419         for (i = 1; i < ehdr->e_shnum; i++) {
420                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
421                         if (size)
422                                 *size = sechdrs[i].sh_size;
423                         return (void *)ehdr + sechdrs[i].sh_offset;
424                 }
425         }
426         if (size)
427                 *size = 0;
428         return NULL;
429 }
430
431 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
432                                         const char *symname)
433 {
434         unsigned int i;
435         char name[MAX_SYMNAME], *c;
436
437         for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
438                 if (lib->dynsym[i].st_name == 0)
439                         continue;
440                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
441                         MAX_SYMNAME);
442                 c = strchr(name, '@');
443                 if (c)
444                         *c = 0;
445                 if (strcmp(symname, name) == 0)
446                         return &lib->dynsym[i];
447         }
448         return NULL;
449 }
450
451 /* Note that we assume the section is .text and the symbol is relative to
452  * the library base
453  */
454 static unsigned long __init find_function64(struct lib64_elfinfo *lib,
455                                             const char *symname)
456 {
457         Elf64_Sym *sym = find_symbol64(lib, symname);
458
459         if (sym == NULL) {
460                 printk(KERN_WARNING "vDSO64: function %s not found !\n",
461                        symname);
462                 return 0;
463         }
464 #ifdef VDS64_HAS_DESCRIPTORS
465         return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
466                 VDSO64_LBASE;
467 #else
468         return sym->st_value - VDSO64_LBASE;
469 #endif
470 }
471
472 static int vdso_do_func_patch64(struct lib32_elfinfo *v32,
473                                 struct lib64_elfinfo *v64,
474                                 const char *orig, const char *fix)
475 {
476         Elf64_Sym *sym64_gen, *sym64_fix;
477
478         sym64_gen = find_symbol64(v64, orig);
479         if (sym64_gen == NULL) {
480                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
481                 return -1;
482         }
483         if (fix == NULL) {
484                 sym64_gen->st_name = 0;
485                 return 0;
486         }
487         sym64_fix = find_symbol64(v64, fix);
488         if (sym64_fix == NULL) {
489                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
490                 return -1;
491         }
492         sym64_gen->st_value = sym64_fix->st_value;
493         sym64_gen->st_size = sym64_fix->st_size;
494         sym64_gen->st_info = sym64_fix->st_info;
495         sym64_gen->st_other = sym64_fix->st_other;
496         sym64_gen->st_shndx = sym64_fix->st_shndx;
497
498         return 0;
499 }
500
501 #endif /* CONFIG_PPC64 */
502
503
504 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
505                                         struct lib64_elfinfo *v64)
506 {
507         void *sect;
508
509         /*
510          * Locate symbol tables & text section
511          */
512
513         v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
514         v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
515         if (v32->dynsym == NULL || v32->dynstr == NULL) {
516                 printk(KERN_ERR "vDSO32: required symbol section not found\n");
517                 return -1;
518         }
519         sect = find_section32(v32->hdr, ".text", NULL);
520         if (sect == NULL) {
521                 printk(KERN_ERR "vDSO32: the .text section was not found\n");
522                 return -1;
523         }
524         v32->text = sect - vdso32_kbase;
525
526 #ifdef CONFIG_PPC64
527         v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
528         v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
529         if (v64->dynsym == NULL || v64->dynstr == NULL) {
530                 printk(KERN_ERR "vDSO64: required symbol section not found\n");
531                 return -1;
532         }
533         sect = find_section64(v64->hdr, ".text", NULL);
534         if (sect == NULL) {
535                 printk(KERN_ERR "vDSO64: the .text section was not found\n");
536                 return -1;
537         }
538         v64->text = sect - vdso64_kbase;
539 #endif /* CONFIG_PPC64 */
540
541         return 0;
542 }
543
544 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
545                                           struct lib64_elfinfo *v64)
546 {
547         /*
548          * Find signal trampolines
549          */
550
551 #ifdef CONFIG_PPC64
552         vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
553 #endif
554         vdso32_sigtramp    = find_function32(v32, "__kernel_sigtramp32");
555         vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
556 }
557
558 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
559                                        struct lib64_elfinfo *v64)
560 {
561         Elf32_Sym *sym32;
562 #ifdef CONFIG_PPC64
563         Elf64_Sym *sym64;
564
565         sym64 = find_symbol64(v64, "__kernel_datapage_offset");
566         if (sym64 == NULL) {
567                 printk(KERN_ERR "vDSO64: Can't find symbol "
568                        "__kernel_datapage_offset !\n");
569                 return -1;
570         }
571         *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
572                 (vdso64_pages << PAGE_SHIFT) -
573                 (sym64->st_value - VDSO64_LBASE);
574 #endif /* CONFIG_PPC64 */
575
576         sym32 = find_symbol32(v32, "__kernel_datapage_offset");
577         if (sym32 == NULL) {
578                 printk(KERN_ERR "vDSO32: Can't find symbol "
579                        "__kernel_datapage_offset !\n");
580                 return -1;
581         }
582         *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
583                 (vdso32_pages << PAGE_SHIFT) -
584                 (sym32->st_value - VDSO32_LBASE);
585
586         return 0;
587 }
588
589 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
590                                        struct lib64_elfinfo *v64)
591 {
592         int i;
593
594         for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
595                 struct vdso_patch_def *patch = &vdso_patches[i];
596                 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
597                         == patch->ftr_value;
598                 if (!match)
599                         continue;
600
601                 DBG("replacing %s with %s...\n", patch->gen_name,
602                     patch->fix_name ? "NONE" : patch->fix_name);
603
604                 /*
605                  * Patch the 32 bits and 64 bits symbols. Note that we do not
606                  * patch the "." symbol on 64 bits.
607                  * It would be easy to do, but doesn't seem to be necessary,
608                  * patching the OPD symbol is enough.
609                  */
610                 vdso_do_func_patch32(v32, v64, patch->gen_name,
611                                      patch->fix_name);
612 #ifdef CONFIG_PPC64
613                 vdso_do_func_patch64(v32, v64, patch->gen_name,
614                                      patch->fix_name);
615 #endif /* CONFIG_PPC64 */
616         }
617
618         return 0;
619 }
620
621
622 static __init int vdso_setup(void)
623 {
624         struct lib32_elfinfo    v32;
625         struct lib64_elfinfo    v64;
626
627         v32.hdr = vdso32_kbase;
628 #ifdef CONFIG_PPC64
629         v64.hdr = vdso64_kbase;
630 #endif
631         if (vdso_do_find_sections(&v32, &v64))
632                 return -1;
633
634         if (vdso_fixup_datapage(&v32, &v64))
635                 return -1;
636
637         if (vdso_fixup_alt_funcs(&v32, &v64))
638                 return -1;
639
640         vdso_setup_trampolines(&v32, &v64);
641
642         return 0;
643 }
644
645 /*
646  * Called from setup_arch to initialize the bitmap of available
647  * syscalls in the systemcfg page
648  */
649 static void __init vdso_setup_syscall_map(void)
650 {
651         unsigned int i;
652         extern unsigned long *sys_call_table;
653         extern unsigned long sys_ni_syscall;
654
655
656         for (i = 0; i < __NR_syscalls; i++) {
657 #ifdef CONFIG_PPC64
658                 if (sys_call_table[i*2] != sys_ni_syscall)
659                         vdso_data->syscall_map_64[i >> 5] |=
660                                 0x80000000UL >> (i & 0x1f);
661                 if (sys_call_table[i*2+1] != sys_ni_syscall)
662                         vdso_data->syscall_map_32[i >> 5] |=
663                                 0x80000000UL >> (i & 0x1f);
664 #else /* CONFIG_PPC64 */
665                 if (sys_call_table[i] != sys_ni_syscall)
666                         vdso_data->syscall_map_32[i >> 5] |=
667                                 0x80000000UL >> (i & 0x1f);
668 #endif /* CONFIG_PPC64 */
669         }
670 }
671
672
673 void __init vdso_init(void)
674 {
675         int i;
676
677 #ifdef CONFIG_PPC64
678         /*
679          * Fill up the "systemcfg" stuff for backward compatiblity
680          */
681         strcpy(vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
682         vdso_data->version.major = SYSTEMCFG_MAJOR;
683         vdso_data->version.minor = SYSTEMCFG_MINOR;
684         vdso_data->processor = mfspr(SPRN_PVR);
685         /*
686          * Fake the old platform number for pSeries and iSeries and add
687          * in LPAR bit if necessary
688          */
689         vdso_data->platform = machine_is(iseries) ? 0x200 : 0x100;
690         if (firmware_has_feature(FW_FEATURE_LPAR))
691                 vdso_data->platform |= 1;
692         vdso_data->physicalMemorySize = lmb_phys_mem_size();
693         vdso_data->dcache_size = ppc64_caches.dsize;
694         vdso_data->dcache_line_size = ppc64_caches.dline_size;
695         vdso_data->icache_size = ppc64_caches.isize;
696         vdso_data->icache_line_size = ppc64_caches.iline_size;
697
698         /*
699          * Calculate the size of the 64 bits vDSO
700          */
701         vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
702         DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
703 #endif /* CONFIG_PPC64 */
704
705
706         /*
707          * Calculate the size of the 32 bits vDSO
708          */
709         vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
710         DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
711
712
713         /*
714          * Setup the syscall map in the vDOS
715          */
716         vdso_setup_syscall_map();
717         /*
718          * Initialize the vDSO images in memory, that is do necessary
719          * fixups of vDSO symbols, locate trampolines, etc...
720          */
721         if (vdso_setup()) {
722                 printk(KERN_ERR "vDSO setup failure, not enabled !\n");
723                 vdso32_pages = 0;
724 #ifdef CONFIG_PPC64
725                 vdso64_pages = 0;
726 #endif
727                 return;
728         }
729
730         /* Make sure pages are in the correct state */
731         for (i = 0; i < vdso32_pages; i++) {
732                 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
733                 ClearPageReserved(pg);
734                 get_page(pg);
735
736         }
737 #ifdef CONFIG_PPC64
738         for (i = 0; i < vdso64_pages; i++) {
739                 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
740                 ClearPageReserved(pg);
741                 get_page(pg);
742         }
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