144 lines
3.7 KiB
C
144 lines
3.7 KiB
C
/*
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* Hibernation support for x86-64
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*
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* Distribute under GPLv2
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*
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* Copyright (c) 2007 Rafael J. Wysocki <rjw@sisk.pl>
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* Copyright (c) 2002 Pavel Machek <pavel@ucw.cz>
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* Copyright (c) 2001 Patrick Mochel <mochel@osdl.org>
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*/
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#include <linux/gfp.h>
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#include <linux/smp.h>
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#include <linux/suspend.h>
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#include <linux/scatterlist.h>
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#include <linux/kdebug.h>
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#include <crypto/hash.h>
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#include <asm/e820/api.h>
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#include <asm/init.h>
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#include <asm/proto.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/mtrr.h>
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#include <asm/sections.h>
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#include <asm/suspend.h>
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#include <asm/tlbflush.h>
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static int set_up_temporary_text_mapping(pgd_t *pgd)
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{
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pmd_t *pmd;
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pud_t *pud;
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p4d_t *p4d = NULL;
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pgprot_t pgtable_prot = __pgprot(_KERNPG_TABLE);
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pgprot_t pmd_text_prot = __pgprot(__PAGE_KERNEL_LARGE_EXEC);
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/* Filter out unsupported __PAGE_KERNEL* bits: */
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pgprot_val(pmd_text_prot) &= __default_kernel_pte_mask;
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pgprot_val(pgtable_prot) &= __default_kernel_pte_mask;
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/*
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* The new mapping only has to cover the page containing the image
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* kernel's entry point (jump_address_phys), because the switch over to
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* it is carried out by relocated code running from a page allocated
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* specifically for this purpose and covered by the identity mapping, so
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* the temporary kernel text mapping is only needed for the final jump.
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* Moreover, in that mapping the virtual address of the image kernel's
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* entry point must be the same as its virtual address in the image
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* kernel (restore_jump_address), so the image kernel's
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* restore_registers() code doesn't find itself in a different area of
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* the virtual address space after switching over to the original page
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* tables used by the image kernel.
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*/
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if (pgtable_l5_enabled()) {
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p4d = (p4d_t *)get_safe_page(GFP_ATOMIC);
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if (!p4d)
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return -ENOMEM;
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}
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pud = (pud_t *)get_safe_page(GFP_ATOMIC);
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if (!pud)
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return -ENOMEM;
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pmd = (pmd_t *)get_safe_page(GFP_ATOMIC);
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if (!pmd)
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return -ENOMEM;
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set_pmd(pmd + pmd_index(restore_jump_address),
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__pmd((jump_address_phys & PMD_MASK) | pgprot_val(pmd_text_prot)));
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set_pud(pud + pud_index(restore_jump_address),
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__pud(__pa(pmd) | pgprot_val(pgtable_prot)));
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if (p4d) {
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p4d_t new_p4d = __p4d(__pa(pud) | pgprot_val(pgtable_prot));
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pgd_t new_pgd = __pgd(__pa(p4d) | pgprot_val(pgtable_prot));
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set_p4d(p4d + p4d_index(restore_jump_address), new_p4d);
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set_pgd(pgd + pgd_index(restore_jump_address), new_pgd);
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} else {
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/* No p4d for 4-level paging: point the pgd to the pud page table */
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pgd_t new_pgd = __pgd(__pa(pud) | pgprot_val(pgtable_prot));
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set_pgd(pgd + pgd_index(restore_jump_address), new_pgd);
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}
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return 0;
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}
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static void *alloc_pgt_page(void *context)
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{
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return (void *)get_safe_page(GFP_ATOMIC);
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}
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static int set_up_temporary_mappings(void)
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{
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struct x86_mapping_info info = {
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.alloc_pgt_page = alloc_pgt_page,
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.page_flag = __PAGE_KERNEL_LARGE_EXEC,
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.offset = __PAGE_OFFSET,
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};
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unsigned long mstart, mend;
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pgd_t *pgd;
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int result;
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int i;
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pgd = (pgd_t *)get_safe_page(GFP_ATOMIC);
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if (!pgd)
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return -ENOMEM;
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/* Prepare a temporary mapping for the kernel text */
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result = set_up_temporary_text_mapping(pgd);
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if (result)
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return result;
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/* Set up the direct mapping from scratch */
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for (i = 0; i < nr_pfn_mapped; i++) {
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mstart = pfn_mapped[i].start << PAGE_SHIFT;
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mend = pfn_mapped[i].end << PAGE_SHIFT;
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result = kernel_ident_mapping_init(&info, pgd, mstart, mend);
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if (result)
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return result;
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}
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temp_level4_pgt = __pa(pgd);
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return 0;
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}
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asmlinkage int swsusp_arch_resume(void)
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{
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int error;
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/* We have got enough memory and from now on we cannot recover */
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error = set_up_temporary_mappings();
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if (error)
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return error;
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error = relocate_restore_code();
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if (error)
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return error;
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restore_image();
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return 0;
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}
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