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142 lines
3.7 KiB
142 lines
3.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Hibernation support for x86-64 |
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* |
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* Copyright (c) 2007 Rafael J. Wysocki <[email protected]> |
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* Copyright (c) 2002 Pavel Machek <[email protected]> |
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* Copyright (c) 2001 Patrick Mochel <[email protected]> |
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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 <linux/pgtable.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/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_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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