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