Merge branch 'irq-fix' of git://www.modarm9.com/gitsrc/pub/people/ukleinek/linux...
[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 #include <linux/lmb.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/prom.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                 CPU_FTR_USE_TB, 0,
104                 "__kernel_clock_gettime", NULL
105         },
106         {
107                 CPU_FTR_USE_TB, 0,
108                 "__kernel_clock_getres", NULL
109         },
110         {
111                 CPU_FTR_USE_TB, 0,
112                 "__kernel_get_tbfreq", NULL
113         },
114 };
115
116 /*
117  * Some infos carried around for each of them during parsing at
118  * boot time.
119  */
120 struct lib32_elfinfo
121 {
122         Elf32_Ehdr      *hdr;           /* ptr to ELF */
123         Elf32_Sym       *dynsym;        /* ptr to .dynsym section */
124         unsigned long   dynsymsize;     /* size of .dynsym section */
125         char            *dynstr;        /* ptr to .dynstr section */
126         unsigned long   text;           /* offset of .text section in .so */
127 };
128
129 struct lib64_elfinfo
130 {
131         Elf64_Ehdr      *hdr;
132         Elf64_Sym       *dynsym;
133         unsigned long   dynsymsize;
134         char            *dynstr;
135         unsigned long   text;
136 };
137
138
139 #ifdef __DEBUG
140 static void dump_one_vdso_page(struct page *pg, struct page *upg)
141 {
142         printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT),
143                page_count(pg),
144                pg->flags);
145         if (upg/* && pg != upg*/) {
146                 printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg)
147                                                        << PAGE_SHIFT),
148                        page_count(upg),
149                        upg->flags);
150         }
151         printk("\n");
152 }
153
154 static void dump_vdso_pages(struct vm_area_struct * vma)
155 {
156         int i;
157
158         if (!vma || test_thread_flag(TIF_32BIT)) {
159                 printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase);
160                 for (i=0; i<vdso32_pages; i++) {
161                         struct page *pg = virt_to_page(vdso32_kbase +
162                                                        i*PAGE_SIZE);
163                         struct page *upg = (vma && vma->vm_mm) ?
164                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
165                                 : NULL;
166                         dump_one_vdso_page(pg, upg);
167                 }
168         }
169         if (!vma || !test_thread_flag(TIF_32BIT)) {
170                 printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase);
171                 for (i=0; i<vdso64_pages; i++) {
172                         struct page *pg = virt_to_page(vdso64_kbase +
173                                                        i*PAGE_SIZE);
174                         struct page *upg = (vma && vma->vm_mm) ?
175                                 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
176                                 : NULL;
177                         dump_one_vdso_page(pg, upg);
178                 }
179         }
180 }
181 #endif /* DEBUG */
182
183 /*
184  * This is called from binfmt_elf, we create the special vma for the
185  * vDSO and insert it into the mm struct tree
186  */
187 int arch_setup_additional_pages(struct linux_binprm *bprm,
188                                 int executable_stack)
189 {
190         struct mm_struct *mm = current->mm;
191         struct page **vdso_pagelist;
192         unsigned long vdso_pages;
193         unsigned long vdso_base;
194         int rc;
195
196         if (!vdso_ready)
197                 return 0;
198
199 #ifdef CONFIG_PPC64
200         if (test_thread_flag(TIF_32BIT)) {
201                 vdso_pagelist = vdso32_pagelist;
202                 vdso_pages = vdso32_pages;
203                 vdso_base = VDSO32_MBASE;
204         } else {
205                 vdso_pagelist = vdso64_pagelist;
206                 vdso_pages = vdso64_pages;
207                 vdso_base = VDSO64_MBASE;
208         }
209 #else
210         vdso_pagelist = vdso32_pagelist;
211         vdso_pages = vdso32_pages;
212         vdso_base = VDSO32_MBASE;
213 #endif
214
215         current->mm->context.vdso_base = 0;
216
217         /* vDSO has a problem and was disabled, just don't "enable" it for the
218          * process
219          */
220         if (vdso_pages == 0)
221                 return 0;
222         /* Add a page to the vdso size for the data page */
223         vdso_pages ++;
224
225         /*
226          * pick a base address for the vDSO in process space. We try to put it
227          * at vdso_base which is the "natural" base for it, but we might fail
228          * and end up putting it elsewhere.
229          */
230         down_write(&mm->mmap_sem);
231         vdso_base = get_unmapped_area(NULL, vdso_base,
232                                       vdso_pages << PAGE_SHIFT, 0, 0);
233         if (IS_ERR_VALUE(vdso_base)) {
234                 rc = vdso_base;
235                 goto fail_mmapsem;
236         }
237
238         /*
239          * our vma flags don't have VM_WRITE so by default, the process isn't
240          * allowed to write those pages.
241          * gdb can break that with ptrace interface, and thus trigger COW on
242          * those pages but it's then your responsibility to never do that on
243          * the "data" page of the vDSO or you'll stop getting kernel updates
244          * and your nice userland gettimeofday will be totally dead.
245          * It's fine to use that for setting breakpoints in the vDSO code
246          * pages though
247          *
248          * Make sure the vDSO gets into every core dump.
249          * Dumping its contents makes post-mortem fully interpretable later
250          * without matching up the same kernel and hardware config to see
251          * what PC values meant.
252          */
253         rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
254                                      VM_READ|VM_EXEC|
255                                      VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC|
256                                      VM_ALWAYSDUMP,
257                                      vdso_pagelist);
258         if (rc)
259                 goto fail_mmapsem;
260
261         /* Put vDSO base into mm struct */
262         current->mm->context.vdso_base = vdso_base;
263
264         up_write(&mm->mmap_sem);
265         return 0;
266
267  fail_mmapsem:
268         up_write(&mm->mmap_sem);
269         return rc;
270 }
271
272 const char *arch_vma_name(struct vm_area_struct *vma)
273 {
274         if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
275                 return "[vdso]";
276         return NULL;
277 }
278
279
280
281 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
282                                   unsigned long *size)
283 {
284         Elf32_Shdr *sechdrs;
285         unsigned int i;
286         char *secnames;
287
288         /* Grab section headers and strings so we can tell who is who */
289         sechdrs = (void *)ehdr + ehdr->e_shoff;
290         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
291
292         /* Find the section they want */
293         for (i = 1; i < ehdr->e_shnum; i++) {
294                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
295                         if (size)
296                                 *size = sechdrs[i].sh_size;
297                         return (void *)ehdr + sechdrs[i].sh_offset;
298                 }
299         }
300         *size = 0;
301         return NULL;
302 }
303
304 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
305                                         const char *symname)
306 {
307         unsigned int i;
308         char name[MAX_SYMNAME], *c;
309
310         for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
311                 if (lib->dynsym[i].st_name == 0)
312                         continue;
313                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
314                         MAX_SYMNAME);
315                 c = strchr(name, '@');
316                 if (c)
317                         *c = 0;
318                 if (strcmp(symname, name) == 0)
319                         return &lib->dynsym[i];
320         }
321         return NULL;
322 }
323
324 /* Note that we assume the section is .text and the symbol is relative to
325  * the library base
326  */
327 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
328                                             const char *symname)
329 {
330         Elf32_Sym *sym = find_symbol32(lib, symname);
331
332         if (sym == NULL) {
333                 printk(KERN_WARNING "vDSO32: function %s not found !\n",
334                        symname);
335                 return 0;
336         }
337         return sym->st_value - VDSO32_LBASE;
338 }
339
340 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
341                                        struct lib64_elfinfo *v64,
342                                        const char *orig, const char *fix)
343 {
344         Elf32_Sym *sym32_gen, *sym32_fix;
345
346         sym32_gen = find_symbol32(v32, orig);
347         if (sym32_gen == NULL) {
348                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
349                 return -1;
350         }
351         if (fix == NULL) {
352                 sym32_gen->st_name = 0;
353                 return 0;
354         }
355         sym32_fix = find_symbol32(v32, fix);
356         if (sym32_fix == NULL) {
357                 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
358                 return -1;
359         }
360         sym32_gen->st_value = sym32_fix->st_value;
361         sym32_gen->st_size = sym32_fix->st_size;
362         sym32_gen->st_info = sym32_fix->st_info;
363         sym32_gen->st_other = sym32_fix->st_other;
364         sym32_gen->st_shndx = sym32_fix->st_shndx;
365
366         return 0;
367 }
368
369
370 #ifdef CONFIG_PPC64
371
372 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
373                                   unsigned long *size)
374 {
375         Elf64_Shdr *sechdrs;
376         unsigned int i;
377         char *secnames;
378
379         /* Grab section headers and strings so we can tell who is who */
380         sechdrs = (void *)ehdr + ehdr->e_shoff;
381         secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
382
383         /* Find the section they want */
384         for (i = 1; i < ehdr->e_shnum; i++) {
385                 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
386                         if (size)
387                                 *size = sechdrs[i].sh_size;
388                         return (void *)ehdr + sechdrs[i].sh_offset;
389                 }
390         }
391         if (size)
392                 *size = 0;
393         return NULL;
394 }
395
396 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
397                                         const char *symname)
398 {
399         unsigned int i;
400         char name[MAX_SYMNAME], *c;
401
402         for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
403                 if (lib->dynsym[i].st_name == 0)
404                         continue;
405                 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
406                         MAX_SYMNAME);
407                 c = strchr(name, '@');
408                 if (c)
409                         *c = 0;
410                 if (strcmp(symname, name) == 0)
411                         return &lib->dynsym[i];
412         }
413         return NULL;
414 }
415
416 /* Note that we assume the section is .text and the symbol is relative to
417  * the library base
418  */
419 static unsigned long __init find_function64(struct lib64_elfinfo *lib,
420                                             const char *symname)
421 {
422         Elf64_Sym *sym = find_symbol64(lib, symname);
423
424         if (sym == NULL) {
425                 printk(KERN_WARNING "vDSO64: function %s not found !\n",
426                        symname);
427                 return 0;
428         }
429 #ifdef VDS64_HAS_DESCRIPTORS
430         return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
431                 VDSO64_LBASE;
432 #else
433         return sym->st_value - VDSO64_LBASE;
434 #endif
435 }
436
437 static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32,
438                                        struct lib64_elfinfo *v64,
439                                        const char *orig, const char *fix)
440 {
441         Elf64_Sym *sym64_gen, *sym64_fix;
442
443         sym64_gen = find_symbol64(v64, orig);
444         if (sym64_gen == NULL) {
445                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
446                 return -1;
447         }
448         if (fix == NULL) {
449                 sym64_gen->st_name = 0;
450                 return 0;
451         }
452         sym64_fix = find_symbol64(v64, fix);
453         if (sym64_fix == NULL) {
454                 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
455                 return -1;
456         }
457         sym64_gen->st_value = sym64_fix->st_value;
458         sym64_gen->st_size = sym64_fix->st_size;
459         sym64_gen->st_info = sym64_fix->st_info;
460         sym64_gen->st_other = sym64_fix->st_other;
461         sym64_gen->st_shndx = sym64_fix->st_shndx;
462
463         return 0;
464 }
465
466 #endif /* CONFIG_PPC64 */
467
468
469 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
470                                         struct lib64_elfinfo *v64)
471 {
472         void *sect;
473
474         /*
475          * Locate symbol tables & text section
476          */
477
478         v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
479         v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
480         if (v32->dynsym == NULL || v32->dynstr == NULL) {
481                 printk(KERN_ERR "vDSO32: required symbol section not found\n");
482                 return -1;
483         }
484         sect = find_section32(v32->hdr, ".text", NULL);
485         if (sect == NULL) {
486                 printk(KERN_ERR "vDSO32: the .text section was not found\n");
487                 return -1;
488         }
489         v32->text = sect - vdso32_kbase;
490
491 #ifdef CONFIG_PPC64
492         v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
493         v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
494         if (v64->dynsym == NULL || v64->dynstr == NULL) {
495                 printk(KERN_ERR "vDSO64: required symbol section not found\n");
496                 return -1;
497         }
498         sect = find_section64(v64->hdr, ".text", NULL);
499         if (sect == NULL) {
500                 printk(KERN_ERR "vDSO64: the .text section was not found\n");
501                 return -1;
502         }
503         v64->text = sect - vdso64_kbase;
504 #endif /* CONFIG_PPC64 */
505
506         return 0;
507 }
508
509 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
510                                           struct lib64_elfinfo *v64)
511 {
512         /*
513          * Find signal trampolines
514          */
515
516 #ifdef CONFIG_PPC64
517         vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
518 #endif
519         vdso32_sigtramp    = find_function32(v32, "__kernel_sigtramp32");
520         vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
521 }
522
523 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
524                                        struct lib64_elfinfo *v64)
525 {
526         Elf32_Sym *sym32;
527 #ifdef CONFIG_PPC64
528         Elf64_Sym *sym64;
529
530         sym64 = find_symbol64(v64, "__kernel_datapage_offset");
531         if (sym64 == NULL) {
532                 printk(KERN_ERR "vDSO64: Can't find symbol "
533                        "__kernel_datapage_offset !\n");
534                 return -1;
535         }
536         *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
537                 (vdso64_pages << PAGE_SHIFT) -
538                 (sym64->st_value - VDSO64_LBASE);
539 #endif /* CONFIG_PPC64 */
540
541         sym32 = find_symbol32(v32, "__kernel_datapage_offset");
542         if (sym32 == NULL) {
543                 printk(KERN_ERR "vDSO32: Can't find symbol "
544                        "__kernel_datapage_offset !\n");
545                 return -1;
546         }
547         *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
548                 (vdso32_pages << PAGE_SHIFT) -
549                 (sym32->st_value - VDSO32_LBASE);
550
551         return 0;
552 }
553
554
555 static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
556                                       struct lib64_elfinfo *v64)
557 {
558         void *start32;
559         unsigned long size32;
560
561 #ifdef CONFIG_PPC64
562         void *start64;
563         unsigned long size64;
564
565         start64 = find_section64(v64->hdr, "__ftr_fixup", &size64);
566         if (start64)
567                 do_feature_fixups(cur_cpu_spec->cpu_features,
568                                   start64, start64 + size64);
569
570         start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64);
571         if (start64)
572                 do_feature_fixups(powerpc_firmware_features,
573                                   start64, start64 + size64);
574 #endif /* CONFIG_PPC64 */
575
576         start32 = find_section32(v32->hdr, "__ftr_fixup", &size32);
577         if (start32)
578                 do_feature_fixups(cur_cpu_spec->cpu_features,
579                                   start32, start32 + size32);
580
581 #ifdef CONFIG_PPC64
582         start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32);
583         if (start32)
584                 do_feature_fixups(powerpc_firmware_features,
585                                   start32, start32 + size32);
586 #endif /* CONFIG_PPC64 */
587
588         return 0;
589 }
590
591 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
592                                        struct lib64_elfinfo *v64)
593 {
594         int i;
595
596         for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
597                 struct vdso_patch_def *patch = &vdso_patches[i];
598                 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
599                         == patch->ftr_value;
600                 if (!match)
601                         continue;
602
603                 DBG("replacing %s with %s...\n", patch->gen_name,
604                     patch->fix_name ? "NONE" : patch->fix_name);
605
606                 /*
607                  * Patch the 32 bits and 64 bits symbols. Note that we do not
608                  * patch the "." symbol on 64 bits.
609                  * It would be easy to do, but doesn't seem to be necessary,
610                  * patching the OPD symbol is enough.
611                  */
612                 vdso_do_func_patch32(v32, v64, patch->gen_name,
613                                      patch->fix_name);
614 #ifdef CONFIG_PPC64
615                 vdso_do_func_patch64(v32, v64, patch->gen_name,
616                                      patch->fix_name);
617 #endif /* CONFIG_PPC64 */
618         }
619
620         return 0;
621 }
622
623
624 static __init int vdso_setup(void)
625 {
626         struct lib32_elfinfo    v32;
627         struct lib64_elfinfo    v64;
628
629         v32.hdr = vdso32_kbase;
630 #ifdef CONFIG_PPC64
631         v64.hdr = vdso64_kbase;
632 #endif
633         if (vdso_do_find_sections(&v32, &v64))
634                 return -1;
635
636         if (vdso_fixup_datapage(&v32, &v64))
637                 return -1;
638
639         if (vdso_fixup_features(&v32, &v64))
640                 return -1;
641
642         if (vdso_fixup_alt_funcs(&v32, &v64))
643                 return -1;
644
645         vdso_setup_trampolines(&v32, &v64);
646
647         return 0;
648 }
649
650 /*
651  * Called from setup_arch to initialize the bitmap of available
652  * syscalls in the systemcfg page
653  */
654 static void __init vdso_setup_syscall_map(void)
655 {
656         unsigned int i;
657         extern unsigned long *sys_call_table;
658         extern unsigned long sys_ni_syscall;
659
660
661         for (i = 0; i < __NR_syscalls; i++) {
662 #ifdef CONFIG_PPC64
663                 if (sys_call_table[i*2] != sys_ni_syscall)
664                         vdso_data->syscall_map_64[i >> 5] |=
665                                 0x80000000UL >> (i & 0x1f);
666                 if (sys_call_table[i*2+1] != sys_ni_syscall)
667                         vdso_data->syscall_map_32[i >> 5] |=
668                                 0x80000000UL >> (i & 0x1f);
669 #else /* CONFIG_PPC64 */
670                 if (sys_call_table[i] != sys_ni_syscall)
671                         vdso_data->syscall_map_32[i >> 5] |=
672                                 0x80000000UL >> (i & 0x1f);
673 #endif /* CONFIG_PPC64 */
674         }
675 }
676
677
678 static int __init vdso_init(void)
679 {
680         int i;
681
682 #ifdef CONFIG_PPC64
683         /*
684          * Fill up the "systemcfg" stuff for backward compatiblity
685          */
686         strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
687         vdso_data->version.major = SYSTEMCFG_MAJOR;
688         vdso_data->version.minor = SYSTEMCFG_MINOR;
689         vdso_data->processor = mfspr(SPRN_PVR);
690         /*
691          * Fake the old platform number for pSeries and iSeries and add
692          * in LPAR bit if necessary
693          */
694         vdso_data->platform = machine_is(iseries) ? 0x200 : 0x100;
695         if (firmware_has_feature(FW_FEATURE_LPAR))
696                 vdso_data->platform |= 1;
697         vdso_data->physicalMemorySize = lmb_phys_mem_size();
698         vdso_data->dcache_size = ppc64_caches.dsize;
699         vdso_data->dcache_line_size = ppc64_caches.dline_size;
700         vdso_data->icache_size = ppc64_caches.isize;
701         vdso_data->icache_line_size = ppc64_caches.iline_size;
702
703         /* XXXOJN: Blocks should be added to ppc64_caches and used instead */
704         vdso_data->dcache_block_size = ppc64_caches.dline_size;
705         vdso_data->icache_block_size = ppc64_caches.iline_size;
706         vdso_data->dcache_log_block_size = ppc64_caches.log_dline_size;
707         vdso_data->icache_log_block_size = ppc64_caches.log_iline_size;
708
709         /*
710          * Calculate the size of the 64 bits vDSO
711          */
712         vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
713         DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
714 #else
715         vdso_data->dcache_block_size = L1_CACHE_BYTES;
716         vdso_data->dcache_log_block_size = L1_CACHE_SHIFT;
717         vdso_data->icache_block_size = L1_CACHE_BYTES;
718         vdso_data->icache_log_block_size = L1_CACHE_SHIFT;
719 #endif /* CONFIG_PPC64 */
720
721
722         /*
723          * Calculate the size of the 32 bits vDSO
724          */
725         vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
726         DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
727
728
729         /*
730          * Setup the syscall map in the vDOS
731          */
732         vdso_setup_syscall_map();
733
734         /*
735          * Initialize the vDSO images in memory, that is do necessary
736          * fixups of vDSO symbols, locate trampolines, etc...
737          */
738         if (vdso_setup()) {
739                 printk(KERN_ERR "vDSO setup failure, not enabled !\n");
740                 vdso32_pages = 0;
741 #ifdef CONFIG_PPC64
742                 vdso64_pages = 0;
743 #endif
744                 return 0;
745         }
746
747         /* Make sure pages are in the correct state */
748         vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2),
749                                   GFP_KERNEL);
750         BUG_ON(vdso32_pagelist == NULL);
751         for (i = 0; i < vdso32_pages; i++) {
752                 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
753                 ClearPageReserved(pg);
754                 get_page(pg);
755                 vdso32_pagelist[i] = pg;
756         }
757         vdso32_pagelist[i++] = virt_to_page(vdso_data);
758         vdso32_pagelist[i] = NULL;
759
760 #ifdef CONFIG_PPC64
761         vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2),
762                                   GFP_KERNEL);
763         BUG_ON(vdso64_pagelist == NULL);
764         for (i = 0; i < vdso64_pages; i++) {
765                 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
766                 ClearPageReserved(pg);
767                 get_page(pg);
768                 vdso64_pagelist[i] = pg;
769         }
770         vdso64_pagelist[i++] = virt_to_page(vdso_data);
771         vdso64_pagelist[i] = NULL;
772 #endif /* CONFIG_PPC64 */
773
774         get_page(virt_to_page(vdso_data));
775
776         smp_wmb();
777         vdso_ready = 1;
778
779         return 0;
780 }
781 #ifdef CONFIG_PPC_MERGE
782 arch_initcall(vdso_init);
783 #endif
784
785 int in_gate_area_no_task(unsigned long addr)
786 {
787         return 0;
788 }
789
790 int in_gate_area(struct task_struct *task, unsigned long addr)
791 {
792         return 0;
793 }
794
795 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
796 {
797         return NULL;
798 }
799