170 lines
4.0 KiB
C
170 lines
4.0 KiB
C
/*
|
|
* Hibernation support for x86-64
|
|
*
|
|
* Distribute under GPLv2
|
|
*
|
|
* Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl>
|
|
* Copyright (c) 2002 Pavel Machek <pavel@suse.cz>
|
|
* Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
|
|
*/
|
|
|
|
#include <linux/smp.h>
|
|
#include <linux/suspend.h>
|
|
#include <asm/proto.h>
|
|
#include <asm/page.h>
|
|
#include <asm/pgtable.h>
|
|
#include <asm/mtrr.h>
|
|
|
|
/* References to section boundaries */
|
|
extern const void __nosave_begin, __nosave_end;
|
|
|
|
/* Defined in hibernate_asm_64.S */
|
|
extern int restore_image(void);
|
|
|
|
/*
|
|
* Address to jump to in the last phase of restore in order to get to the image
|
|
* kernel's text (this value is passed in the image header).
|
|
*/
|
|
unsigned long restore_jump_address;
|
|
|
|
/*
|
|
* Value of the cr3 register from before the hibernation (this value is passed
|
|
* in the image header).
|
|
*/
|
|
unsigned long restore_cr3;
|
|
|
|
pgd_t *temp_level4_pgt;
|
|
|
|
void *relocated_restore_code;
|
|
|
|
static int res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long end)
|
|
{
|
|
long i, j;
|
|
|
|
i = pud_index(address);
|
|
pud = pud + i;
|
|
for (; i < PTRS_PER_PUD; pud++, i++) {
|
|
unsigned long paddr;
|
|
pmd_t *pmd;
|
|
|
|
paddr = address + i*PUD_SIZE;
|
|
if (paddr >= end)
|
|
break;
|
|
|
|
pmd = (pmd_t *)get_safe_page(GFP_ATOMIC);
|
|
if (!pmd)
|
|
return -ENOMEM;
|
|
set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
|
|
for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) {
|
|
unsigned long pe;
|
|
|
|
if (paddr >= end)
|
|
break;
|
|
pe = __PAGE_KERNEL_LARGE_EXEC | paddr;
|
|
pe &= __supported_pte_mask;
|
|
set_pmd(pmd, __pmd(pe));
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int set_up_temporary_mappings(void)
|
|
{
|
|
unsigned long start, end, next;
|
|
int error;
|
|
|
|
temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC);
|
|
if (!temp_level4_pgt)
|
|
return -ENOMEM;
|
|
|
|
/* It is safe to reuse the original kernel mapping */
|
|
set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map),
|
|
init_level4_pgt[pgd_index(__START_KERNEL_map)]);
|
|
|
|
/* Set up the direct mapping from scratch */
|
|
start = (unsigned long)pfn_to_kaddr(0);
|
|
end = (unsigned long)pfn_to_kaddr(max_pfn);
|
|
|
|
for (; start < end; start = next) {
|
|
pud_t *pud = (pud_t *)get_safe_page(GFP_ATOMIC);
|
|
if (!pud)
|
|
return -ENOMEM;
|
|
next = start + PGDIR_SIZE;
|
|
if (next > end)
|
|
next = end;
|
|
if ((error = res_phys_pud_init(pud, __pa(start), __pa(next))))
|
|
return error;
|
|
set_pgd(temp_level4_pgt + pgd_index(start),
|
|
mk_kernel_pgd(__pa(pud)));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int swsusp_arch_resume(void)
|
|
{
|
|
int error;
|
|
|
|
/* We have got enough memory and from now on we cannot recover */
|
|
if ((error = set_up_temporary_mappings()))
|
|
return error;
|
|
|
|
relocated_restore_code = (void *)get_safe_page(GFP_ATOMIC);
|
|
if (!relocated_restore_code)
|
|
return -ENOMEM;
|
|
memcpy(relocated_restore_code, &core_restore_code,
|
|
&restore_registers - &core_restore_code);
|
|
|
|
restore_image();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* pfn_is_nosave - check if given pfn is in the 'nosave' section
|
|
*/
|
|
|
|
int pfn_is_nosave(unsigned long pfn)
|
|
{
|
|
unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
|
|
unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
|
|
return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
|
|
}
|
|
|
|
struct restore_data_record {
|
|
unsigned long jump_address;
|
|
unsigned long cr3;
|
|
unsigned long magic;
|
|
};
|
|
|
|
#define RESTORE_MAGIC 0x0123456789ABCDEFUL
|
|
|
|
/**
|
|
* arch_hibernation_header_save - populate the architecture specific part
|
|
* of a hibernation image header
|
|
* @addr: address to save the data at
|
|
*/
|
|
int arch_hibernation_header_save(void *addr, unsigned int max_size)
|
|
{
|
|
struct restore_data_record *rdr = addr;
|
|
|
|
if (max_size < sizeof(struct restore_data_record))
|
|
return -EOVERFLOW;
|
|
rdr->jump_address = restore_jump_address;
|
|
rdr->cr3 = restore_cr3;
|
|
rdr->magic = RESTORE_MAGIC;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* arch_hibernation_header_restore - read the architecture specific data
|
|
* from the hibernation image header
|
|
* @addr: address to read the data from
|
|
*/
|
|
int arch_hibernation_header_restore(void *addr)
|
|
{
|
|
struct restore_data_record *rdr = addr;
|
|
|
|
restore_jump_address = rdr->jump_address;
|
|
restore_cr3 = rdr->cr3;
|
|
return (rdr->magic == RESTORE_MAGIC) ? 0 : -EINVAL;
|
|
}
|