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/arch/powerpc/kernel/vdso.c

http://github.com/mirrors/linux
C | 793 lines | 570 code | 114 blank | 109 comment | 92 complexity | 4721d352cc3a6de9f359e0cb8c68c8ef MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-or-later
  2
  3/*
  4 *    Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
  5 *			 <benh@kernel.crashing.org>
  6 */
  7
  8#include <linux/errno.h>
  9#include <linux/sched.h>
 10#include <linux/kernel.h>
 11#include <linux/mm.h>
 12#include <linux/smp.h>
 13#include <linux/stddef.h>
 14#include <linux/unistd.h>
 15#include <linux/slab.h>
 16#include <linux/user.h>
 17#include <linux/elf.h>
 18#include <linux/security.h>
 19#include <linux/memblock.h>
 20
 21#include <asm/pgtable.h>
 22#include <asm/processor.h>
 23#include <asm/mmu.h>
 24#include <asm/mmu_context.h>
 25#include <asm/prom.h>
 26#include <asm/machdep.h>
 27#include <asm/cputable.h>
 28#include <asm/sections.h>
 29#include <asm/firmware.h>
 30#include <asm/vdso.h>
 31#include <asm/vdso_datapage.h>
 32#include <asm/setup.h>
 33
 34#undef DEBUG
 35
 36#ifdef DEBUG
 37#define DBG(fmt...) printk(fmt)
 38#else
 39#define DBG(fmt...)
 40#endif
 41
 42/* Max supported size for symbol names */
 43#define MAX_SYMNAME	64
 44
 45/* The alignment of the vDSO */
 46#define VDSO_ALIGNMENT	(1 << 16)
 47
 48static unsigned int vdso32_pages;
 49static void *vdso32_kbase;
 50static struct page **vdso32_pagelist;
 51unsigned long vdso32_sigtramp;
 52unsigned long vdso32_rt_sigtramp;
 53
 54#ifdef CONFIG_VDSO32
 55extern char vdso32_start, vdso32_end;
 56#endif
 57
 58#ifdef CONFIG_PPC64
 59extern char vdso64_start, vdso64_end;
 60static void *vdso64_kbase = &vdso64_start;
 61static unsigned int vdso64_pages;
 62static struct page **vdso64_pagelist;
 63unsigned long vdso64_rt_sigtramp;
 64#endif /* CONFIG_PPC64 */
 65
 66static 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 */
 73static union {
 74	struct vdso_data	data;
 75	u8			page[PAGE_SIZE];
 76} vdso_data_store __page_aligned_data;
 77struct vdso_data *vdso_data = &vdso_data_store.data;
 78
 79/* Format of the patch table */
 80struct 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 */
 92static 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
 99/*
100 * Some infos carried around for each of them during parsing at
101 * boot time.
102 */
103struct lib32_elfinfo
104{
105	Elf32_Ehdr	*hdr;		/* ptr to ELF */
106	Elf32_Sym	*dynsym;	/* ptr to .dynsym section */
107	unsigned long	dynsymsize;	/* size of .dynsym section */
108	char		*dynstr;	/* ptr to .dynstr section */
109	unsigned long	text;		/* offset of .text section in .so */
110};
111
112struct lib64_elfinfo
113{
114	Elf64_Ehdr	*hdr;
115	Elf64_Sym	*dynsym;
116	unsigned long	dynsymsize;
117	char		*dynstr;
118	unsigned long	text;
119};
120
121
122/*
123 * This is called from binfmt_elf, we create the special vma for the
124 * vDSO and insert it into the mm struct tree
125 */
126int arch_setup_additional_pages(struct linux_binprm *bprm, int uses_interp)
127{
128	struct mm_struct *mm = current->mm;
129	struct page **vdso_pagelist;
130	unsigned long vdso_pages;
131	unsigned long vdso_base;
132	int rc;
133
134	if (!vdso_ready)
135		return 0;
136
137#ifdef CONFIG_PPC64
138	if (is_32bit_task()) {
139		vdso_pagelist = vdso32_pagelist;
140		vdso_pages = vdso32_pages;
141		vdso_base = VDSO32_MBASE;
142	} else {
143		vdso_pagelist = vdso64_pagelist;
144		vdso_pages = vdso64_pages;
145		/*
146		 * On 64bit we don't have a preferred map address. This
147		 * allows get_unmapped_area to find an area near other mmaps
148		 * and most likely share a SLB entry.
149		 */
150		vdso_base = 0;
151	}
152#else
153	vdso_pagelist = vdso32_pagelist;
154	vdso_pages = vdso32_pages;
155	vdso_base = VDSO32_MBASE;
156#endif
157
158	current->mm->context.vdso_base = 0;
159
160	/* vDSO has a problem and was disabled, just don't "enable" it for the
161	 * process
162	 */
163	if (vdso_pages == 0)
164		return 0;
165	/* Add a page to the vdso size for the data page */
166	vdso_pages ++;
167
168	/*
169	 * pick a base address for the vDSO in process space. We try to put it
170	 * at vdso_base which is the "natural" base for it, but we might fail
171	 * and end up putting it elsewhere.
172	 * Add enough to the size so that the result can be aligned.
173	 */
174	if (down_write_killable(&mm->mmap_sem))
175		return -EINTR;
176	vdso_base = get_unmapped_area(NULL, vdso_base,
177				      (vdso_pages << PAGE_SHIFT) +
178				      ((VDSO_ALIGNMENT - 1) & PAGE_MASK),
179				      0, 0);
180	if (IS_ERR_VALUE(vdso_base)) {
181		rc = vdso_base;
182		goto fail_mmapsem;
183	}
184
185	/* Add required alignment. */
186	vdso_base = ALIGN(vdso_base, VDSO_ALIGNMENT);
187
188	/*
189	 * Put vDSO base into mm struct. We need to do this before calling
190	 * install_special_mapping or the perf counter mmap tracking code
191	 * will fail to recognise it as a vDSO (since arch_vma_name fails).
192	 */
193	current->mm->context.vdso_base = vdso_base;
194
195	/*
196	 * our vma flags don't have VM_WRITE so by default, the process isn't
197	 * allowed to write those pages.
198	 * gdb can break that with ptrace interface, and thus trigger COW on
199	 * those pages but it's then your responsibility to never do that on
200	 * the "data" page of the vDSO or you'll stop getting kernel updates
201	 * and your nice userland gettimeofday will be totally dead.
202	 * It's fine to use that for setting breakpoints in the vDSO code
203	 * pages though.
204	 */
205	rc = install_special_mapping(mm, vdso_base, vdso_pages << PAGE_SHIFT,
206				     VM_READ|VM_EXEC|
207				     VM_MAYREAD|VM_MAYWRITE|VM_MAYEXEC,
208				     vdso_pagelist);
209	if (rc) {
210		current->mm->context.vdso_base = 0;
211		goto fail_mmapsem;
212	}
213
214	up_write(&mm->mmap_sem);
215	return 0;
216
217 fail_mmapsem:
218	up_write(&mm->mmap_sem);
219	return rc;
220}
221
222const char *arch_vma_name(struct vm_area_struct *vma)
223{
224	if (vma->vm_mm && vma->vm_start == vma->vm_mm->context.vdso_base)
225		return "[vdso]";
226	return NULL;
227}
228
229
230
231#ifdef CONFIG_VDSO32
232static void * __init find_section32(Elf32_Ehdr *ehdr, const char *secname,
233				  unsigned long *size)
234{
235	Elf32_Shdr *sechdrs;
236	unsigned int i;
237	char *secnames;
238
239	/* Grab section headers and strings so we can tell who is who */
240	sechdrs = (void *)ehdr + ehdr->e_shoff;
241	secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
242
243	/* Find the section they want */
244	for (i = 1; i < ehdr->e_shnum; i++) {
245		if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
246			if (size)
247				*size = sechdrs[i].sh_size;
248			return (void *)ehdr + sechdrs[i].sh_offset;
249		}
250	}
251	*size = 0;
252	return NULL;
253}
254
255static Elf32_Sym * __init find_symbol32(struct lib32_elfinfo *lib,
256					const char *symname)
257{
258	unsigned int i;
259	char name[MAX_SYMNAME], *c;
260
261	for (i = 0; i < (lib->dynsymsize / sizeof(Elf32_Sym)); i++) {
262		if (lib->dynsym[i].st_name == 0)
263			continue;
264		strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
265			MAX_SYMNAME);
266		c = strchr(name, '@');
267		if (c)
268			*c = 0;
269		if (strcmp(symname, name) == 0)
270			return &lib->dynsym[i];
271	}
272	return NULL;
273}
274
275/* Note that we assume the section is .text and the symbol is relative to
276 * the library base
277 */
278static unsigned long __init find_function32(struct lib32_elfinfo *lib,
279					    const char *symname)
280{
281	Elf32_Sym *sym = find_symbol32(lib, symname);
282
283	if (sym == NULL) {
284		printk(KERN_WARNING "vDSO32: function %s not found !\n",
285		       symname);
286		return 0;
287	}
288	return sym->st_value - VDSO32_LBASE;
289}
290
291static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
292				       struct lib64_elfinfo *v64,
293				       const char *orig, const char *fix)
294{
295	Elf32_Sym *sym32_gen, *sym32_fix;
296
297	sym32_gen = find_symbol32(v32, orig);
298	if (sym32_gen == NULL) {
299		printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", orig);
300		return -1;
301	}
302	if (fix == NULL) {
303		sym32_gen->st_name = 0;
304		return 0;
305	}
306	sym32_fix = find_symbol32(v32, fix);
307	if (sym32_fix == NULL) {
308		printk(KERN_ERR "vDSO32: Can't find symbol %s !\n", fix);
309		return -1;
310	}
311	sym32_gen->st_value = sym32_fix->st_value;
312	sym32_gen->st_size = sym32_fix->st_size;
313	sym32_gen->st_info = sym32_fix->st_info;
314	sym32_gen->st_other = sym32_fix->st_other;
315	sym32_gen->st_shndx = sym32_fix->st_shndx;
316
317	return 0;
318}
319#else /* !CONFIG_VDSO32 */
320static unsigned long __init find_function32(struct lib32_elfinfo *lib,
321					    const char *symname)
322{
323	return 0;
324}
325
326static int __init vdso_do_func_patch32(struct lib32_elfinfo *v32,
327				       struct lib64_elfinfo *v64,
328				       const char *orig, const char *fix)
329{
330	return 0;
331}
332#endif /* CONFIG_VDSO32 */
333
334
335#ifdef CONFIG_PPC64
336
337static void * __init find_section64(Elf64_Ehdr *ehdr, const char *secname,
338				  unsigned long *size)
339{
340	Elf64_Shdr *sechdrs;
341	unsigned int i;
342	char *secnames;
343
344	/* Grab section headers and strings so we can tell who is who */
345	sechdrs = (void *)ehdr + ehdr->e_shoff;
346	secnames = (void *)ehdr + sechdrs[ehdr->e_shstrndx].sh_offset;
347
348	/* Find the section they want */
349	for (i = 1; i < ehdr->e_shnum; i++) {
350		if (strcmp(secnames+sechdrs[i].sh_name, secname) == 0) {
351			if (size)
352				*size = sechdrs[i].sh_size;
353			return (void *)ehdr + sechdrs[i].sh_offset;
354		}
355	}
356	if (size)
357		*size = 0;
358	return NULL;
359}
360
361static Elf64_Sym * __init find_symbol64(struct lib64_elfinfo *lib,
362					const char *symname)
363{
364	unsigned int i;
365	char name[MAX_SYMNAME], *c;
366
367	for (i = 0; i < (lib->dynsymsize / sizeof(Elf64_Sym)); i++) {
368		if (lib->dynsym[i].st_name == 0)
369			continue;
370		strlcpy(name, lib->dynstr + lib->dynsym[i].st_name,
371			MAX_SYMNAME);
372		c = strchr(name, '@');
373		if (c)
374			*c = 0;
375		if (strcmp(symname, name) == 0)
376			return &lib->dynsym[i];
377	}
378	return NULL;
379}
380
381/* Note that we assume the section is .text and the symbol is relative to
382 * the library base
383 */
384static unsigned long __init find_function64(struct lib64_elfinfo *lib,
385					    const char *symname)
386{
387	Elf64_Sym *sym = find_symbol64(lib, symname);
388
389	if (sym == NULL) {
390		printk(KERN_WARNING "vDSO64: function %s not found !\n",
391		       symname);
392		return 0;
393	}
394	return sym->st_value - VDSO64_LBASE;
395}
396
397static int __init vdso_do_func_patch64(struct lib32_elfinfo *v32,
398				       struct lib64_elfinfo *v64,
399				       const char *orig, const char *fix)
400{
401	Elf64_Sym *sym64_gen, *sym64_fix;
402
403	sym64_gen = find_symbol64(v64, orig);
404	if (sym64_gen == NULL) {
405		printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", orig);
406		return -1;
407	}
408	if (fix == NULL) {
409		sym64_gen->st_name = 0;
410		return 0;
411	}
412	sym64_fix = find_symbol64(v64, fix);
413	if (sym64_fix == NULL) {
414		printk(KERN_ERR "vDSO64: Can't find symbol %s !\n", fix);
415		return -1;
416	}
417	sym64_gen->st_value = sym64_fix->st_value;
418	sym64_gen->st_size = sym64_fix->st_size;
419	sym64_gen->st_info = sym64_fix->st_info;
420	sym64_gen->st_other = sym64_fix->st_other;
421	sym64_gen->st_shndx = sym64_fix->st_shndx;
422
423	return 0;
424}
425
426#endif /* CONFIG_PPC64 */
427
428
429static __init int vdso_do_find_sections(struct lib32_elfinfo *v32,
430					struct lib64_elfinfo *v64)
431{
432	void *sect;
433
434	/*
435	 * Locate symbol tables & text section
436	 */
437
438#ifdef CONFIG_VDSO32
439	v32->dynsym = find_section32(v32->hdr, ".dynsym", &v32->dynsymsize);
440	v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
441	if (v32->dynsym == NULL || v32->dynstr == NULL) {
442		printk(KERN_ERR "vDSO32: required symbol section not found\n");
443		return -1;
444	}
445	sect = find_section32(v32->hdr, ".text", NULL);
446	if (sect == NULL) {
447		printk(KERN_ERR "vDSO32: the .text section was not found\n");
448		return -1;
449	}
450	v32->text = sect - vdso32_kbase;
451#endif
452
453#ifdef CONFIG_PPC64
454	v64->dynsym = find_section64(v64->hdr, ".dynsym", &v64->dynsymsize);
455	v64->dynstr = find_section64(v64->hdr, ".dynstr", NULL);
456	if (v64->dynsym == NULL || v64->dynstr == NULL) {
457		printk(KERN_ERR "vDSO64: required symbol section not found\n");
458		return -1;
459	}
460	sect = find_section64(v64->hdr, ".text", NULL);
461	if (sect == NULL) {
462		printk(KERN_ERR "vDSO64: the .text section was not found\n");
463		return -1;
464	}
465	v64->text = sect - vdso64_kbase;
466#endif /* CONFIG_PPC64 */
467
468	return 0;
469}
470
471static __init void vdso_setup_trampolines(struct lib32_elfinfo *v32,
472					  struct lib64_elfinfo *v64)
473{
474	/*
475	 * Find signal trampolines
476	 */
477
478#ifdef CONFIG_PPC64
479	vdso64_rt_sigtramp = find_function64(v64, "__kernel_sigtramp_rt64");
480#endif
481	vdso32_sigtramp	   = find_function32(v32, "__kernel_sigtramp32");
482	vdso32_rt_sigtramp = find_function32(v32, "__kernel_sigtramp_rt32");
483}
484
485static __init int vdso_fixup_datapage(struct lib32_elfinfo *v32,
486				       struct lib64_elfinfo *v64)
487{
488#ifdef CONFIG_VDSO32
489	Elf32_Sym *sym32;
490#endif
491#ifdef CONFIG_PPC64
492	Elf64_Sym *sym64;
493
494       	sym64 = find_symbol64(v64, "__kernel_datapage_offset");
495	if (sym64 == NULL) {
496		printk(KERN_ERR "vDSO64: Can't find symbol "
497		       "__kernel_datapage_offset !\n");
498		return -1;
499	}
500	*((int *)(vdso64_kbase + sym64->st_value - VDSO64_LBASE)) =
501		(vdso64_pages << PAGE_SHIFT) -
502		(sym64->st_value - VDSO64_LBASE);
503#endif /* CONFIG_PPC64 */
504
505#ifdef CONFIG_VDSO32
506	sym32 = find_symbol32(v32, "__kernel_datapage_offset");
507	if (sym32 == NULL) {
508		printk(KERN_ERR "vDSO32: Can't find symbol "
509		       "__kernel_datapage_offset !\n");
510		return -1;
511	}
512	*((int *)(vdso32_kbase + (sym32->st_value - VDSO32_LBASE))) =
513		(vdso32_pages << PAGE_SHIFT) -
514		(sym32->st_value - VDSO32_LBASE);
515#endif
516
517	return 0;
518}
519
520
521static __init int vdso_fixup_features(struct lib32_elfinfo *v32,
522				      struct lib64_elfinfo *v64)
523{
524	unsigned long size;
525	void *start;
526
527#ifdef CONFIG_PPC64
528	start = find_section64(v64->hdr, "__ftr_fixup", &size);
529	if (start)
530		do_feature_fixups(cur_cpu_spec->cpu_features,
531				  start, start + size);
532
533	start = find_section64(v64->hdr, "__mmu_ftr_fixup", &size);
534	if (start)
535		do_feature_fixups(cur_cpu_spec->mmu_features,
536				  start, start + size);
537
538	start = find_section64(v64->hdr, "__fw_ftr_fixup", &size);
539	if (start)
540		do_feature_fixups(powerpc_firmware_features,
541				  start, start + size);
542
543	start = find_section64(v64->hdr, "__lwsync_fixup", &size);
544	if (start)
545		do_lwsync_fixups(cur_cpu_spec->cpu_features,
546				 start, start + size);
547#endif /* CONFIG_PPC64 */
548
549#ifdef CONFIG_VDSO32
550	start = find_section32(v32->hdr, "__ftr_fixup", &size);
551	if (start)
552		do_feature_fixups(cur_cpu_spec->cpu_features,
553				  start, start + size);
554
555	start = find_section32(v32->hdr, "__mmu_ftr_fixup", &size);
556	if (start)
557		do_feature_fixups(cur_cpu_spec->mmu_features,
558				  start, start + size);
559
560#ifdef CONFIG_PPC64
561	start = find_section32(v32->hdr, "__fw_ftr_fixup", &size);
562	if (start)
563		do_feature_fixups(powerpc_firmware_features,
564				  start, start + size);
565#endif /* CONFIG_PPC64 */
566
567	start = find_section32(v32->hdr, "__lwsync_fixup", &size);
568	if (start)
569		do_lwsync_fixups(cur_cpu_spec->cpu_features,
570				 start, start + size);
571#endif
572
573	return 0;
574}
575
576static __init int vdso_fixup_alt_funcs(struct lib32_elfinfo *v32,
577				       struct lib64_elfinfo *v64)
578{
579	int i;
580
581	for (i = 0; i < ARRAY_SIZE(vdso_patches); i++) {
582		struct vdso_patch_def *patch = &vdso_patches[i];
583		int match = (cur_cpu_spec->cpu_features & patch->ftr_mask)
584			== patch->ftr_value;
585		if (!match)
586			continue;
587
588		DBG("replacing %s with %s...\n", patch->gen_name,
589		    patch->fix_name ? "NONE" : patch->fix_name);
590
591		/*
592		 * Patch the 32 bits and 64 bits symbols. Note that we do not
593		 * patch the "." symbol on 64 bits.
594		 * It would be easy to do, but doesn't seem to be necessary,
595		 * patching the OPD symbol is enough.
596		 */
597		vdso_do_func_patch32(v32, v64, patch->gen_name,
598				     patch->fix_name);
599#ifdef CONFIG_PPC64
600		vdso_do_func_patch64(v32, v64, patch->gen_name,
601				     patch->fix_name);
602#endif /* CONFIG_PPC64 */
603	}
604
605	return 0;
606}
607
608
609static __init int vdso_setup(void)
610{
611	struct lib32_elfinfo	v32;
612	struct lib64_elfinfo	v64;
613
614	v32.hdr = vdso32_kbase;
615#ifdef CONFIG_PPC64
616	v64.hdr = vdso64_kbase;
617#endif
618	if (vdso_do_find_sections(&v32, &v64))
619		return -1;
620
621	if (vdso_fixup_datapage(&v32, &v64))
622		return -1;
623
624	if (vdso_fixup_features(&v32, &v64))
625		return -1;
626
627	if (vdso_fixup_alt_funcs(&v32, &v64))
628		return -1;
629
630	vdso_setup_trampolines(&v32, &v64);
631
632	return 0;
633}
634
635/*
636 * Called from setup_arch to initialize the bitmap of available
637 * syscalls in the systemcfg page
638 */
639static void __init vdso_setup_syscall_map(void)
640{
641	unsigned int i;
642	extern unsigned long *sys_call_table;
643#ifdef CONFIG_PPC64
644	extern unsigned long *compat_sys_call_table;
645#endif
646	extern unsigned long sys_ni_syscall;
647
648
649	for (i = 0; i < NR_syscalls; i++) {
650#ifdef CONFIG_PPC64
651		if (sys_call_table[i] != sys_ni_syscall)
652			vdso_data->syscall_map_64[i >> 5] |=
653				0x80000000UL >> (i & 0x1f);
654		if (IS_ENABLED(CONFIG_COMPAT) &&
655		    compat_sys_call_table[i] != sys_ni_syscall)
656			vdso_data->syscall_map_32[i >> 5] |=
657				0x80000000UL >> (i & 0x1f);
658#else /* CONFIG_PPC64 */
659		if (sys_call_table[i] != sys_ni_syscall)
660			vdso_data->syscall_map_32[i >> 5] |=
661				0x80000000UL >> (i & 0x1f);
662#endif /* CONFIG_PPC64 */
663	}
664}
665
666#ifdef CONFIG_PPC64
667int vdso_getcpu_init(void)
668{
669	unsigned long cpu, node, val;
670
671	/*
672	 * SPRG_VDSO contains the CPU in the bottom 16 bits and the NUMA node
673	 * in the next 16 bits.  The VDSO uses this to implement getcpu().
674	 */
675	cpu = get_cpu();
676	WARN_ON_ONCE(cpu > 0xffff);
677
678	node = cpu_to_node(cpu);
679	WARN_ON_ONCE(node > 0xffff);
680
681	val = (cpu & 0xfff) | ((node & 0xffff) << 16);
682	mtspr(SPRN_SPRG_VDSO_WRITE, val);
683	get_paca()->sprg_vdso = val;
684
685	put_cpu();
686
687	return 0;
688}
689/* We need to call this before SMP init */
690early_initcall(vdso_getcpu_init);
691#endif
692
693static int __init vdso_init(void)
694{
695	int i;
696
697#ifdef CONFIG_PPC64
698	/*
699	 * Fill up the "systemcfg" stuff for backward compatibility
700	 */
701	strcpy((char *)vdso_data->eye_catcher, "SYSTEMCFG:PPC64");
702	vdso_data->version.major = SYSTEMCFG_MAJOR;
703	vdso_data->version.minor = SYSTEMCFG_MINOR;
704	vdso_data->processor = mfspr(SPRN_PVR);
705	/*
706	 * Fake the old platform number for pSeries and add
707	 * in LPAR bit if necessary
708	 */
709	vdso_data->platform = 0x100;
710	if (firmware_has_feature(FW_FEATURE_LPAR))
711		vdso_data->platform |= 1;
712	vdso_data->physicalMemorySize = memblock_phys_mem_size();
713	vdso_data->dcache_size = ppc64_caches.l1d.size;
714	vdso_data->dcache_line_size = ppc64_caches.l1d.line_size;
715	vdso_data->icache_size = ppc64_caches.l1i.size;
716	vdso_data->icache_line_size = ppc64_caches.l1i.line_size;
717	vdso_data->dcache_block_size = ppc64_caches.l1d.block_size;
718	vdso_data->icache_block_size = ppc64_caches.l1i.block_size;
719	vdso_data->dcache_log_block_size = ppc64_caches.l1d.log_block_size;
720	vdso_data->icache_log_block_size = ppc64_caches.l1i.log_block_size;
721
722	/*
723	 * Calculate the size of the 64 bits vDSO
724	 */
725	vdso64_pages = (&vdso64_end - &vdso64_start) >> PAGE_SHIFT;
726	DBG("vdso64_kbase: %p, 0x%x pages\n", vdso64_kbase, vdso64_pages);
727#endif /* CONFIG_PPC64 */
728
729
730#ifdef CONFIG_VDSO32
731	vdso32_kbase = &vdso32_start;
732
733	/*
734	 * Calculate the size of the 32 bits vDSO
735	 */
736	vdso32_pages = (&vdso32_end - &vdso32_start) >> PAGE_SHIFT;
737	DBG("vdso32_kbase: %p, 0x%x pages\n", vdso32_kbase, vdso32_pages);
738#endif
739
740
741	/*
742	 * Setup the syscall map in the vDOS
743	 */
744	vdso_setup_syscall_map();
745
746	/*
747	 * Initialize the vDSO images in memory, that is do necessary
748	 * fixups of vDSO symbols, locate trampolines, etc...
749	 */
750	if (vdso_setup()) {
751		printk(KERN_ERR "vDSO setup failure, not enabled !\n");
752		vdso32_pages = 0;
753#ifdef CONFIG_PPC64
754		vdso64_pages = 0;
755#endif
756		return 0;
757	}
758
759#ifdef CONFIG_VDSO32
760	/* Make sure pages are in the correct state */
761	vdso32_pagelist = kcalloc(vdso32_pages + 2, sizeof(struct page *),
762				  GFP_KERNEL);
763	BUG_ON(vdso32_pagelist == NULL);
764	for (i = 0; i < vdso32_pages; i++) {
765		struct page *pg = virt_to_page(vdso32_kbase + i*PAGE_SIZE);
766		get_page(pg);
767		vdso32_pagelist[i] = pg;
768	}
769	vdso32_pagelist[i++] = virt_to_page(vdso_data);
770	vdso32_pagelist[i] = NULL;
771#endif
772
773#ifdef CONFIG_PPC64
774	vdso64_pagelist = kcalloc(vdso64_pages + 2, sizeof(struct page *),
775				  GFP_KERNEL);
776	BUG_ON(vdso64_pagelist == NULL);
777	for (i = 0; i < vdso64_pages; i++) {
778		struct page *pg = virt_to_page(vdso64_kbase + i*PAGE_SIZE);
779		get_page(pg);
780		vdso64_pagelist[i] = pg;
781	}
782	vdso64_pagelist[i++] = virt_to_page(vdso_data);
783	vdso64_pagelist[i] = NULL;
784#endif /* CONFIG_PPC64 */
785
786	get_page(virt_to_page(vdso_data));
787
788	smp_wmb();
789	vdso_ready = 1;
790
791	return 0;
792}
793arch_initcall(vdso_init);