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/arch/x86/power/hibernate_64.c

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C | 171 lines | 107 code | 29 blank | 35 comment | 15 complexity | 977bbfb57a71bc2233822991dcacfb00 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/*
  2 * Hibernation support for x86-64
  3 *
  4 * Distribute under GPLv2
  5 *
  6 * Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl>
  7 * Copyright (c) 2002 Pavel Machek <pavel@suse.cz>
  8 * Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
  9 */
 10
 11#include <linux/gfp.h>
 12#include <linux/smp.h>
 13#include <linux/suspend.h>
 14#include <asm/proto.h>
 15#include <asm/page.h>
 16#include <asm/pgtable.h>
 17#include <asm/mtrr.h>
 18#include <asm/suspend.h>
 19
 20/* References to section boundaries */
 21extern const void __nosave_begin, __nosave_end;
 22
 23/* Defined in hibernate_asm_64.S */
 24extern int restore_image(void);
 25
 26/*
 27 * Address to jump to in the last phase of restore in order to get to the image
 28 * kernel's text (this value is passed in the image header).
 29 */
 30unsigned long restore_jump_address;
 31
 32/*
 33 * Value of the cr3 register from before the hibernation (this value is passed
 34 * in the image header).
 35 */
 36unsigned long restore_cr3;
 37
 38pgd_t *temp_level4_pgt;
 39
 40void *relocated_restore_code;
 41
 42static int res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long end)
 43{
 44	long i, j;
 45
 46	i = pud_index(address);
 47	pud = pud + i;
 48	for (; i < PTRS_PER_PUD; pud++, i++) {
 49		unsigned long paddr;
 50		pmd_t *pmd;
 51
 52		paddr = address + i*PUD_SIZE;
 53		if (paddr >= end)
 54			break;
 55
 56		pmd = (pmd_t *)get_safe_page(GFP_ATOMIC);
 57		if (!pmd)
 58			return -ENOMEM;
 59		set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
 60		for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) {
 61			unsigned long pe;
 62
 63			if (paddr >= end)
 64				break;
 65			pe = __PAGE_KERNEL_LARGE_EXEC | paddr;
 66			pe &= __supported_pte_mask;
 67			set_pmd(pmd, __pmd(pe));
 68		}
 69	}
 70	return 0;
 71}
 72
 73static int set_up_temporary_mappings(void)
 74{
 75	unsigned long start, end, next;
 76	int error;
 77
 78	temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC);
 79	if (!temp_level4_pgt)
 80		return -ENOMEM;
 81
 82	/* It is safe to reuse the original kernel mapping */
 83	set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map),
 84		init_level4_pgt[pgd_index(__START_KERNEL_map)]);
 85
 86	/* Set up the direct mapping from scratch */
 87	start = (unsigned long)pfn_to_kaddr(0);
 88	end = (unsigned long)pfn_to_kaddr(max_pfn);
 89
 90	for (; start < end; start = next) {
 91		pud_t *pud = (pud_t *)get_safe_page(GFP_ATOMIC);
 92		if (!pud)
 93			return -ENOMEM;
 94		next = start + PGDIR_SIZE;
 95		if (next > end)
 96			next = end;
 97		if ((error = res_phys_pud_init(pud, __pa(start), __pa(next))))
 98			return error;
 99		set_pgd(temp_level4_pgt + pgd_index(start),
100			mk_kernel_pgd(__pa(pud)));
101	}
102	return 0;
103}
104
105int swsusp_arch_resume(void)
106{
107	int error;
108
109	/* We have got enough memory and from now on we cannot recover */
110	if ((error = set_up_temporary_mappings()))
111		return error;
112
113	relocated_restore_code = (void *)get_safe_page(GFP_ATOMIC);
114	if (!relocated_restore_code)
115		return -ENOMEM;
116	memcpy(relocated_restore_code, &core_restore_code,
117	       &restore_registers - &core_restore_code);
118
119	restore_image();
120	return 0;
121}
122
123/*
124 *	pfn_is_nosave - check if given pfn is in the 'nosave' section
125 */
126
127int pfn_is_nosave(unsigned long pfn)
128{
129	unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
130	unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
131	return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
132}
133
134struct restore_data_record {
135	unsigned long jump_address;
136	unsigned long cr3;
137	unsigned long magic;
138};
139
140#define RESTORE_MAGIC	0x0123456789ABCDEFUL
141
142/**
143 *	arch_hibernation_header_save - populate the architecture specific part
144 *		of a hibernation image header
145 *	@addr: address to save the data at
146 */
147int arch_hibernation_header_save(void *addr, unsigned int max_size)
148{
149	struct restore_data_record *rdr = addr;
150
151	if (max_size < sizeof(struct restore_data_record))
152		return -EOVERFLOW;
153	rdr->jump_address = restore_jump_address;
154	rdr->cr3 = restore_cr3;
155	rdr->magic = RESTORE_MAGIC;
156	return 0;
157}
158
159/**
160 *	arch_hibernation_header_restore - read the architecture specific data
161 *		from the hibernation image header
162 *	@addr: address to read the data from
163 */
164int arch_hibernation_header_restore(void *addr)
165{
166	struct restore_data_record *rdr = addr;
167
168	restore_jump_address = rdr->jump_address;
169	restore_cr3 = rdr->cr3;
170	return (rdr->magic == RESTORE_MAGIC) ? 0 : -EINVAL;
171}