143 строки
3.7 KiB
C
143 строки
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Hibernation support for x86-64
|
|
*
|
|
* Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl>
|
|
* Copyright (c) 2002 Pavel Machek <pavel@ucw.cz>
|
|
* Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
|
|
*/
|
|
|
|
#include <linux/gfp.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/suspend.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/kdebug.h>
|
|
#include <linux/pgtable.h>
|
|
|
|
#include <crypto/hash.h>
|
|
|
|
#include <asm/e820/api.h>
|
|
#include <asm/init.h>
|
|
#include <asm/proto.h>
|
|
#include <asm/page.h>
|
|
#include <asm/mtrr.h>
|
|
#include <asm/sections.h>
|
|
#include <asm/suspend.h>
|
|
#include <asm/tlbflush.h>
|
|
|
|
static int set_up_temporary_text_mapping(pgd_t *pgd)
|
|
{
|
|
pmd_t *pmd;
|
|
pud_t *pud;
|
|
p4d_t *p4d = NULL;
|
|
pgprot_t pgtable_prot = __pgprot(_KERNPG_TABLE);
|
|
pgprot_t pmd_text_prot = __pgprot(__PAGE_KERNEL_LARGE_EXEC);
|
|
|
|
/* Filter out unsupported __PAGE_KERNEL* bits: */
|
|
pgprot_val(pmd_text_prot) &= __default_kernel_pte_mask;
|
|
pgprot_val(pgtable_prot) &= __default_kernel_pte_mask;
|
|
|
|
/*
|
|
* The new mapping only has to cover the page containing the image
|
|
* kernel's entry point (jump_address_phys), because the switch over to
|
|
* it is carried out by relocated code running from a page allocated
|
|
* specifically for this purpose and covered by the identity mapping, so
|
|
* the temporary kernel text mapping is only needed for the final jump.
|
|
* Moreover, in that mapping the virtual address of the image kernel's
|
|
* entry point must be the same as its virtual address in the image
|
|
* kernel (restore_jump_address), so the image kernel's
|
|
* restore_registers() code doesn't find itself in a different area of
|
|
* the virtual address space after switching over to the original page
|
|
* tables used by the image kernel.
|
|
*/
|
|
|
|
if (pgtable_l5_enabled()) {
|
|
p4d = (p4d_t *)get_safe_page(GFP_ATOMIC);
|
|
if (!p4d)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
pud = (pud_t *)get_safe_page(GFP_ATOMIC);
|
|
if (!pud)
|
|
return -ENOMEM;
|
|
|
|
pmd = (pmd_t *)get_safe_page(GFP_ATOMIC);
|
|
if (!pmd)
|
|
return -ENOMEM;
|
|
|
|
set_pmd(pmd + pmd_index(restore_jump_address),
|
|
__pmd((jump_address_phys & PMD_MASK) | pgprot_val(pmd_text_prot)));
|
|
set_pud(pud + pud_index(restore_jump_address),
|
|
__pud(__pa(pmd) | pgprot_val(pgtable_prot)));
|
|
if (p4d) {
|
|
p4d_t new_p4d = __p4d(__pa(pud) | pgprot_val(pgtable_prot));
|
|
pgd_t new_pgd = __pgd(__pa(p4d) | pgprot_val(pgtable_prot));
|
|
|
|
set_p4d(p4d + p4d_index(restore_jump_address), new_p4d);
|
|
set_pgd(pgd + pgd_index(restore_jump_address), new_pgd);
|
|
} else {
|
|
/* No p4d for 4-level paging: point the pgd to the pud page table */
|
|
pgd_t new_pgd = __pgd(__pa(pud) | pgprot_val(pgtable_prot));
|
|
set_pgd(pgd + pgd_index(restore_jump_address), new_pgd);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void *alloc_pgt_page(void *context)
|
|
{
|
|
return (void *)get_safe_page(GFP_ATOMIC);
|
|
}
|
|
|
|
static int set_up_temporary_mappings(void)
|
|
{
|
|
struct x86_mapping_info info = {
|
|
.alloc_pgt_page = alloc_pgt_page,
|
|
.page_flag = __PAGE_KERNEL_LARGE_EXEC,
|
|
.offset = __PAGE_OFFSET,
|
|
};
|
|
unsigned long mstart, mend;
|
|
pgd_t *pgd;
|
|
int result;
|
|
int i;
|
|
|
|
pgd = (pgd_t *)get_safe_page(GFP_ATOMIC);
|
|
if (!pgd)
|
|
return -ENOMEM;
|
|
|
|
/* Prepare a temporary mapping for the kernel text */
|
|
result = set_up_temporary_text_mapping(pgd);
|
|
if (result)
|
|
return result;
|
|
|
|
/* Set up the direct mapping from scratch */
|
|
for (i = 0; i < nr_pfn_mapped; i++) {
|
|
mstart = pfn_mapped[i].start << PAGE_SHIFT;
|
|
mend = pfn_mapped[i].end << PAGE_SHIFT;
|
|
|
|
result = kernel_ident_mapping_init(&info, pgd, mstart, mend);
|
|
if (result)
|
|
return result;
|
|
}
|
|
|
|
temp_pgt = __pa(pgd);
|
|
return 0;
|
|
}
|
|
|
|
asmlinkage int swsusp_arch_resume(void)
|
|
{
|
|
int error;
|
|
|
|
/* We have got enough memory and from now on we cannot recover */
|
|
error = set_up_temporary_mappings();
|
|
if (error)
|
|
return error;
|
|
|
|
error = relocate_restore_code();
|
|
if (error)
|
|
return error;
|
|
|
|
restore_image();
|
|
return 0;
|
|
}
|