efivars: Refactor sanity checking code into separate function
[linux/fpc-iii.git] / arch / powerpc / kernel / vdso.c
blobce74c335a6a405b03e8400a72b74e1fc7227b56f
2 /*
3 * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
4 * <benh@kernel.crashing.org>
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
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/memblock.h>
26 #include <asm/pgtable.h>
27 #include <asm/processor.h>
28 #include <asm/mmu.h>
29 #include <asm/mmu_context.h>
30 #include <asm/prom.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 #include <asm/setup.h>
39 #undef DEBUG
41 #ifdef DEBUG
42 #define DBG(fmt...) printk(fmt)
43 #else
44 #define DBG(fmt...)
45 #endif
47 /* Max supported size for symbol names */
48 #define MAX_SYMNAME 64
50 /* The alignment of the vDSO */
51 #define VDSO_ALIGNMENT (1 << 16)
53 extern char vdso32_start, vdso32_end;
54 static void *vdso32_kbase = &vdso32_start;
55 static unsigned int vdso32_pages;
56 static struct page **vdso32_pagelist;
57 unsigned long vdso32_sigtramp;
58 unsigned long vdso32_rt_sigtramp;
60 #ifdef CONFIG_PPC64
61 extern char vdso64_start, vdso64_end;
62 static void *vdso64_kbase = &vdso64_start;
63 static unsigned int vdso64_pages;
64 static struct page **vdso64_pagelist;
65 unsigned long vdso64_rt_sigtramp;
66 #endif /* CONFIG_PPC64 */
68 static int vdso_ready;
71 * The vdso data page (aka. systemcfg for old ppc64 fans) is here.
72 * Once the early boot kernel code no longer needs to muck around
73 * with it, it will become dynamically allocated
75 static union {
76 struct vdso_data data;
77 u8 page[PAGE_SIZE];
78 } vdso_data_store __page_aligned_data;
79 struct vdso_data *vdso_data = &vdso_data_store.data;
81 /* Format of the patch table */
82 struct vdso_patch_def
84 unsigned long ftr_mask, ftr_value;
85 const char *gen_name;
86 const char *fix_name;
89 /* Table of functions to patch based on the CPU type/revision
91 * Currently, we only change sync_dicache to do nothing on processors
92 * with a coherent icache
94 static struct vdso_patch_def vdso_patches[] = {
96 CPU_FTR_COHERENT_ICACHE, CPU_FTR_COHERENT_ICACHE,
97 "__kernel_sync_dicache", "__kernel_sync_dicache_p5"
100 CPU_FTR_USE_TB, 0,
101 "__kernel_gettimeofday", NULL
104 CPU_FTR_USE_TB, 0,
105 "__kernel_clock_gettime", NULL
108 CPU_FTR_USE_TB, 0,
109 "__kernel_clock_getres", NULL
112 CPU_FTR_USE_TB, 0,
113 "__kernel_get_tbfreq", NULL
116 CPU_FTR_USE_TB, 0,
117 "__kernel_time", NULL
122 * Some infos carried around for each of them during parsing at
123 * boot time.
125 struct lib32_elfinfo
127 Elf32_Ehdr *hdr; /* ptr to ELF */
128 Elf32_Sym *dynsym; /* ptr to .dynsym section */
129 unsigned long dynsymsize; /* size of .dynsym section */
130 char *dynstr; /* ptr to .dynstr section */
131 unsigned long text; /* offset of .text section in .so */
134 struct lib64_elfinfo
136 Elf64_Ehdr *hdr;
137 Elf64_Sym *dynsym;
138 unsigned long dynsymsize;
139 char *dynstr;
140 unsigned long text;
144 #ifdef __DEBUG
145 static void dump_one_vdso_page(struct page *pg, struct page *upg)
147 printk("kpg: %p (c:%d,f:%08lx)", __va(page_to_pfn(pg) << PAGE_SHIFT),
148 page_count(pg),
149 pg->flags);
150 if (upg && !IS_ERR(upg) /* && pg != upg*/) {
151 printk(" upg: %p (c:%d,f:%08lx)", __va(page_to_pfn(upg)
152 << PAGE_SHIFT),
153 page_count(upg),
154 upg->flags);
156 printk("\n");
159 static void dump_vdso_pages(struct vm_area_struct * vma)
161 int i;
163 if (!vma || is_32bit_task()) {
164 printk("vDSO32 @ %016lx:\n", (unsigned long)vdso32_kbase);
165 for (i=0; i<vdso32_pages; i++) {
166 struct page *pg = virt_to_page(vdso32_kbase +
167 i*PAGE_SIZE);
168 struct page *upg = (vma && vma->vm_mm) ?
169 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
170 : NULL;
171 dump_one_vdso_page(pg, upg);
174 if (!vma || !is_32bit_task()) {
175 printk("vDSO64 @ %016lx:\n", (unsigned long)vdso64_kbase);
176 for (i=0; i<vdso64_pages; i++) {
177 struct page *pg = virt_to_page(vdso64_kbase +
178 i*PAGE_SIZE);
179 struct page *upg = (vma && vma->vm_mm) ?
180 follow_page(vma, vma->vm_start + i*PAGE_SIZE, 0)
181 : NULL;
182 dump_one_vdso_page(pg, upg);
186 #endif /* DEBUG */
189 * This is called from binfmt_elf, we create the special vma for the
190 * vDSO and insert it into the mm struct tree
192 int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
194 struct mm_struct *mm = current->mm;
195 struct page **vdso_pagelist;
196 unsigned long vdso_pages;
197 unsigned long vdso_base;
198 int rc;
200 if (!vdso_ready)
201 return 0;
203 #ifdef CONFIG_PPC64
204 if (is_32bit_task()) {
205 vdso_pagelist = vdso32_pagelist;
206 vdso_pages = vdso32_pages;
207 vdso_base = VDSO32_MBASE;
208 } else {
209 vdso_pagelist = vdso64_pagelist;
210 vdso_pages = vdso64_pages;
212 * On 64bit we don't have a preferred map address. This
213 * allows get_unmapped_area to find an area near other mmaps
214 * and most likely share a SLB entry.
216 vdso_base = 0;
218 #else
219 vdso_pagelist = vdso32_pagelist;
220 vdso_pages = vdso32_pages;
221 vdso_base = VDSO32_MBASE;
222 #endif
224 current->mm->context.vdso_base = 0;
226 /* vDSO has a problem and was disabled, just don't "enable" it for the
227 * process
229 if (vdso_pages == 0)
230 return 0;
231 /* Add a page to the vdso size for the data page */
232 vdso_pages ++;
235 * pick a base address for the vDSO in process space. We try to put it
236 * at vdso_base which is the "natural" base for it, but we might fail
237 * and end up putting it elsewhere.
238 * Add enough to the size so that the result can be aligned.
240 down_write(&mm->mmap_sem);
241 vdso_base = get_unmapped_area(NULL, vdso_base,
242 (vdso_pages << PAGE_SHIFT) +
243 ((VDSO_ALIGNMENT - 1) & PAGE_MASK),
244 0, 0);
245 if (IS_ERR_VALUE(vdso_base)) {
246 rc = vdso_base;
247 goto fail_mmapsem;
250 /* Add required alignment. */
251 vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT);
254 * Put vDSO base into mm struct. We need to do this before calling
255 * install_special_mapping or the perf counter mmap tracking code
256 * will fail to recognise it as a vDSO (since arch_vma_name fails).
258 current->mm->context.vdso_base = vdso_base;
261 * our vma flags don't have VM_WRITE so by default, the process isn't
262 * allowed to write those pages.
263 * gdb can break that with ptrace interface, and thus trigger COW on
264 * those pages but it's then your responsibility to never do that on
265 * the "data" page of the vDSO or you'll stop getting kernel updates
266 * and your nice userland gettimeofday will be totally dead.
267 * It's fine to use that for setting breakpoints in the vDSO code
268 * pages though.
270 rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
271 VM_READ|VM_EXEC|
272 VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
273 vdso_pagelist);
274 if (rc) {
275 current->mm->context.vdso_base = 0;
276 goto fail_mmapsem;
279 up_write(&mm->mmap_sem);
280 return 0;
282 fail_mmapsem:
283 up_write(&mm->mmap_sem);
284 return rc;
287 const char *arch_vma_name(struct vm_area_struct *vma)
289 if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
290 return "[vdso]";
291 return NULL;
296 static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
297 unsigned long *size)
299 Elf32_Shdr *sechdrs;
300 unsigned int i;
301 char *secnames;
303 /* Grab section headers and strings so we can tell who is who */
304 sechdrs = (void *)ehdr + ehdr->e_shoff;
305 secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
307 /* Find the section they want */
308 for (i = 1; i < ehdr->e_shnum; i++) {
309 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
310 if (size)
311 *size = sechdrs[i].sh_size;
312 return (void *)ehdr + sechdrs[i].sh_offset;
315 *size = 0;
316 return NULL;
319 static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
320 const char *symname)
322 unsigned int i;
323 char name[MAX_SYMNAME], *c;
325 for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
326 if (lib->dynsym[i].st_name == 0)
327 continue;
328 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
329 MAX_SYMNAME);
330 c = strchr(name, '@');
331 if (c)
332 *c = 0;
333 if (strcmp(symname, name) == 0)
334 return &lib->dynsym[i];
336 return NULL;
339 /* Note that we assume the section is .text and the symbol is relative to
340 * the library base
342 static unsigned long __init find_function32(struct lib32_elfinfo *lib,
343 const char *symname)
345 Elf32_Sym *sym = find_symbol32(lib, symname);
347 if (sym == NULL) {
348 printk(KERN_WARNING "vDSO32: function %s not found !\n",
349 symname);
350 return 0;
352 return sym->st_value - VDSO32_LBASE;
355 static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
356 struct lib64_elfinfo *v64,
357 const char *orig, const char *fix)
359 Elf32_Sym *sym32_gen, *sym32_fix;
361 sym32_gen = find_symbol32(v32, orig);
362 if (sym32_gen == NULL) {
363 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
364 return -1;
366 if (fix == NULL) {
367 sym32_gen->st_name = 0;
368 return 0;
370 sym32_fix = find_symbol32(v32, fix);
371 if (sym32_fix == NULL) {
372 printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
373 return -1;
375 sym32_gen->st_value = sym32_fix->st_value;
376 sym32_gen->st_size = sym32_fix->st_size;
377 sym32_gen->st_info = sym32_fix->st_info;
378 sym32_gen->st_other = sym32_fix->st_other;
379 sym32_gen->st_shndx = sym32_fix->st_shndx;
381 return 0;
385 #ifdef CONFIG_PPC64
387 static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
388 unsigned long *size)
390 Elf64_Shdr *sechdrs;
391 unsigned int i;
392 char *secnames;
394 /* Grab section headers and strings so we can tell who is who */
395 sechdrs = (void *)ehdr + ehdr->e_shoff;
396 secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
398 /* Find the section they want */
399 for (i = 1; i < ehdr->e_shnum; i++) {
400 if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
401 if (size)
402 *size = sechdrs[i].sh_size;
403 return (void *)ehdr + sechdrs[i].sh_offset;
406 if (size)
407 *size = 0;
408 return NULL;
411 static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
412 const char *symname)
414 unsigned int i;
415 char name[MAX_SYMNAME], *c;
417 for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
418 if (lib->dynsym[i].st_name == 0)
419 continue;
420 strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
421 MAX_SYMNAME);
422 c = strchr(name, '@');
423 if (c)
424 *c = 0;
425 if (strcmp(symname, name) == 0)
426 return &lib->dynsym[i];
428 return NULL;
431 /* Note that we assume the section is .text and the symbol is relative to
432 * the library base
434 static unsigned long __init find_function64(struct lib64_elfinfo *lib,
435 const char *symname)
437 Elf64_Sym *sym = find_symbol64(lib, symname);
439 if (sym == NULL) {
440 printk(KERN_WARNING "vDSO64: function %s not found !\n",
441 symname);
442 return 0;
444 #ifdef VDS64_HAS_DESCRIPTORS
445 return *((u64 *)(vdso64_kbase + sym->st_value - VDSO64_LBASE)) -
446 VDSO64_LBASE;
447 #else
448 return sym->st_value - VDSO64_LBASE;
449 #endif
452 static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32,
453 struct lib64_elfinfo *v64,
454 const char *orig, const char *fix)
456 Elf64_Sym *sym64_gen, *sym64_fix;
458 sym64_gen = find_symbol64(v64, orig);
459 if (sym64_gen == NULL) {
460 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
461 return -1;
463 if (fix == NULL) {
464 sym64_gen->st_name = 0;
465 return 0;
467 sym64_fix = find_symbol64(v64, fix);
468 if (sym64_fix == NULL) {
469 printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
470 return -1;
472 sym64_gen->st_value = sym64_fix->st_value;
473 sym64_gen->st_size = sym64_fix->st_size;
474 sym64_gen->st_info = sym64_fix->st_info;
475 sym64_gen->st_other = sym64_fix->st_other;
476 sym64_gen->st_shndx = sym64_fix->st_shndx;
478 return 0;
481 #endif /* CONFIG_PPC64 */
484 static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
485 struct lib64_elfinfo *v64)
487 void *sect;
490 * Locate symbol tables & text section
493 v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
494 v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
495 if (v32->dynsym == NULL || v32->dynstr == NULL) {
496 printk(KERN_ERR "vDSO32: required symbol section not found\n");
497 return -1;
499 sect = find_section32(v32->hdr, ".text", NULL);
500 if (sect == NULL) {
501 printk(KERN_ERR "vDSO32: the .text section was not found\n");
502 return -1;
504 v32->text = sect - vdso32_kbase;
506 #ifdef CONFIG_PPC64
507 v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
508 v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
509 if (v64->dynsym == NULL || v64->dynstr == NULL) {
510 printk(KERN_ERR "vDSO64: required symbol section not found\n");
511 return -1;
513 sect = find_section64(v64->hdr, ".text", NULL);
514 if (sect == NULL) {
515 printk(KERN_ERR "vDSO64: the .text section was not found\n");
516 return -1;
518 v64->text = sect - vdso64_kbase;
519 #endif /* CONFIG_PPC64 */
521 return 0;
524 static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
525 struct lib64_elfinfo *v64)
528 * Find signal trampolines
531 #ifdef CONFIG_PPC64
532 vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
533 #endif
534 vdso32_sigtramp = find_function32(v32, "__kernel_sigtramp32");
535 vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
538 static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
539 struct lib64_elfinfo *v64)
541 Elf32_Sym *sym32;
542 #ifdef CONFIG_PPC64
543 Elf64_Sym *sym64;
545 sym64 = find_symbol64(v64, "__kernel_datapage_offset");
546 if (sym64 == NULL) {
547 printk(KERN_ERR "vDSO64: Can't find symbol "
548 "__kernel_datapage_offset !\n");
549 return -1;
551 *((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
552 (vdso64_pages << PAGE_SHIFT) -
553 (sym64->st_value - VDSO64_LBASE);
554 #endif /* CONFIG_PPC64 */
556 sym32 = find_symbol32(v32, "__kernel_datapage_offset");
557 if (sym32 == NULL) {
558 printk(KERN_ERR "vDSO32: Can't find symbol "
559 "__kernel_datapage_offset !\n");
560 return -1;
562 *((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
563 (vdso32_pages << PAGE_SHIFT) -
564 (sym32->st_value - VDSO32_LBASE);
566 return 0;
570 static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
571 struct lib64_elfinfo *v64)
573 void *start32;
574 unsigned long size32;
576 #ifdef CONFIG_PPC64
577 void *start64;
578 unsigned long size64;
580 start64 = find_section64(v64->hdr, "__ftr_fixup", &size64);
581 if (start64)
582 do_feature_fixups(cur_cpu_spec->cpu_features,
583 start64, start64 + size64);
585 start64 = find_section64(v64->hdr, "__mmu_ftr_fixup", &size64);
586 if (start64)
587 do_feature_fixups(cur_cpu_spec->mmu_features,
588 start64, start64 + size64);
590 start64 = find_section64(v64->hdr, "__fw_ftr_fixup", &size64);
591 if (start64)
592 do_feature_fixups(powerpc_firmware_features,
593 start64, start64 + size64);
595 start64 = find_section64(v64->hdr, "__lwsync_fixup", &size64);
596 if (start64)
597 do_lwsync_fixups(cur_cpu_spec->cpu_features,
598 start64, start64 + size64);
599 #endif /* CONFIG_PPC64 */
601 start32 = find_section32(v32->hdr, "__ftr_fixup", &size32);
602 if (start32)
603 do_feature_fixups(cur_cpu_spec->cpu_features,
604 start32, start32 + size32);
606 start32 = find_section32(v32->hdr, "__mmu_ftr_fixup", &size32);
607 if (start32)
608 do_feature_fixups(cur_cpu_spec->mmu_features,
609 start32, start32 + size32);
611 #ifdef CONFIG_PPC64
612 start32 = find_section32(v32->hdr, "__fw_ftr_fixup", &size32);
613 if (start32)
614 do_feature_fixups(powerpc_firmware_features,
615 start32, start32 + size32);
616 #endif /* CONFIG_PPC64 */
618 start32 = find_section32(v32->hdr, "__lwsync_fixup", &size32);
619 if (start32)
620 do_lwsync_fixups(cur_cpu_spec->cpu_features,
621 start32, start32 + size32);
623 return 0;
626 static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
627 struct lib64_elfinfo *v64)
629 int i;
631 for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
632 struct vdso_patch_def *patch = &vdso_patches[i];
633 int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
634 == patch->ftr_value;
635 if (!match)
636 continue;
638 DBG("replacing %s with %s...\n", patch->gen_name,
639 patch->fix_name ? "NONE" : patch->fix_name);
642 * Patch the 32 bits and 64 bits symbols. Note that we do not
643 * patch the "." symbol on 64 bits.
644 * It would be easy to do, but doesn't seem to be necessary,
645 * patching the OPD symbol is enough.
647 vdso_do_func_patch32(v32, v64, patch->gen_name,
648 patch->fix_name);
649 #ifdef CONFIG_PPC64
650 vdso_do_func_patch64(v32, v64, patch->gen_name,
651 patch->fix_name);
652 #endif /* CONFIG_PPC64 */
655 return 0;
659 static __init int vdso_setup(void)
661 struct lib32_elfinfo v32;
662 struct lib64_elfinfo v64;
664 v32.hdr = vdso32_kbase;
665 #ifdef CONFIG_PPC64
666 v64.hdr = vdso64_kbase;
667 #endif
668 if (vdso_do_find_sections(&v32, &v64))
669 return -1;
671 if (vdso_fixup_datapage(&v32, &v64))
672 return -1;
674 if (vdso_fixup_features(&v32, &v64))
675 return -1;
677 if (vdso_fixup_alt_funcs(&v32, &v64))
678 return -1;
680 vdso_setup_trampolines(&v32, &v64);
682 return 0;
686 * Called from setup_arch to initialize the bitmap of available
687 * syscalls in the systemcfg page
689 static void __init vdso_setup_syscall_map(void)
691 unsigned int i;
692 extern unsigned long *sys_call_table;
693 extern unsigned long sys_ni_syscall;
696 for (i = 0; i < __NR_syscalls; i++) {
697 #ifdef CONFIG_PPC64
698 if (sys_call_table[i*2] != sys_ni_syscall)
699 vdso_data->syscall_map_64[i >> 5] |=
700 0x80000000UL >> (i & 0x1f);
701 if (sys_call_table[i*2+1] != sys_ni_syscall)
702 vdso_data->syscall_map_32[i >> 5] |=
703 0x80000000UL >> (i & 0x1f);
704 #else /* CONFIG_PPC64 */
705 if (sys_call_table[i] != sys_ni_syscall)
706 vdso_data->syscall_map_32[i >> 5] |=
707 0x80000000UL >> (i & 0x1f);
708 #endif /* CONFIG_PPC64 */
712 #ifdef CONFIG_PPC64
713 int vdso_getcpu_init(void)
715 unsigned long cpu, node, val;
718 * SPRG_VDSO contains the CPU in the bottom 16 bits and the NUMA node
719 * in the next 16 bits. The VDSO uses this to implement getcpu().
721 cpu = get_cpu();
722 WARN_ON_ONCE(cpu > 0xffff);
724 node = cpu_to_node(cpu);
725 WARN_ON_ONCE(node > 0xffff);
727 val = (cpu & 0xfff) | ((node & 0xffff) << 16);
728 mtspr(SPRN_SPRG_VDSO_WRITE, val);
729 get_paca()->sprg_vdso = val;
731 put_cpu();
733 return 0;
735 /* We need to call this before SMP init */
736 early_initcall(vdso_getcpu_init);
737 #endif
739 static int __init vdso_init(void)
741 int i;
743 #ifdef CONFIG_PPC64
745 * Fill up the "systemcfg" stuff for backward compatibility
747 strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
748 vdso_data->version.major = SYSTEMCFG_MAJOR;
749 vdso_data->version.minor = SYSTEMCFG_MINOR;
750 vdso_data->processor = mfspr(SPRN_PVR);
752 * Fake the old platform number for pSeries and add
753 * in LPAR bit if necessary
755 vdso_data->platform = 0x100;
756 if (firmware_has_feature(FW_FEATURE_LPAR))
757 vdso_data->platform |= 1;
758 vdso_data->physicalMemorySize = memblock_phys_mem_size();
759 vdso_data->dcache_size = ppc64_caches.dsize;
760 vdso_data->dcache_line_size = ppc64_caches.dline_size;
761 vdso_data->icache_size = ppc64_caches.isize;
762 vdso_data->icache_line_size = ppc64_caches.iline_size;
764 /* XXXOJN: Blocks should be added to ppc64_caches and used instead */
765 vdso_data->dcache_block_size = ppc64_caches.dline_size;
766 vdso_data->icache_block_size = ppc64_caches.iline_size;
767 vdso_data->dcache_log_block_size = ppc64_caches.log_dline_size;
768 vdso_data->icache_log_block_size = ppc64_caches.log_iline_size;
771 * Calculate the size of the 64 bits vDSO
773 vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
774 DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
775 #else
776 vdso_data->dcache_block_size = L1_CACHE_BYTES;
777 vdso_data->dcache_log_block_size = L1_CACHE_SHIFT;
778 vdso_data->icache_block_size = L1_CACHE_BYTES;
779 vdso_data->icache_log_block_size = L1_CACHE_SHIFT;
780 #endif /* CONFIG_PPC64 */
784 * Calculate the size of the 32 bits vDSO
786 vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
787 DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
791 * Setup the syscall map in the vDOS
793 vdso_setup_syscall_map();
796 * Initialize the vDSO images in memory, that is do necessary
797 * fixups of vDSO symbols, locate trampolines, etc...
799 if (vdso_setup()) {
800 printk(KERN_ERR "vDSO setup failure, not enabled !\n");
801 vdso32_pages = 0;
802 #ifdef CONFIG_PPC64
803 vdso64_pages = 0;
804 #endif
805 return 0;
808 /* Make sure pages are in the correct state */
809 vdso32_pagelist = kzalloc(sizeof(struct page *) * (vdso32_pages + 2),
810 GFP_KERNEL);
811 BUG_ON(vdso32_pagelist == NULL);
812 for (i = 0; i < vdso32_pages; i++) {
813 struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
814 ClearPageReserved(pg);
815 get_page(pg);
816 vdso32_pagelist[i] = pg;
818 vdso32_pagelist[i++] = virt_to_page(vdso_data);
819 vdso32_pagelist[i] = NULL;
821 #ifdef CONFIG_PPC64
822 vdso64_pagelist = kzalloc(sizeof(struct page *) * (vdso64_pages + 2),
823 GFP_KERNEL);
824 BUG_ON(vdso64_pagelist == NULL);
825 for (i = 0; i < vdso64_pages; i++) {
826 struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
827 ClearPageReserved(pg);
828 get_page(pg);
829 vdso64_pagelist[i] = pg;
831 vdso64_pagelist[i++] = virt_to_page(vdso_data);
832 vdso64_pagelist[i] = NULL;
833 #endif /* CONFIG_PPC64 */
835 get_page(virt_to_page(vdso_data));
837 smp_wmb();
838 vdso_ready = 1;
840 return 0;
842 arch_initcall(vdso_init);
844 int in_gate_area_no_mm(unsigned long addr)
846 return 0;
849 int in_gate_area(struct mm_struct *mm, unsigned long addr)
851 return 0;
854 struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
856 return NULL;