mirror of https://gitee.com/openkylin/linux.git
150 lines
3.5 KiB
C
150 lines
3.5 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 <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/suspend.h>
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/* References to section boundaries */
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extern const void __nosave_begin, __nosave_end;
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/* Defined in hibernate_asm_64.S */
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extern int restore_image(void);
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/*
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* Address to jump to in the last phase of restore in order to get to the image
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* kernel's text (this value is passed in the image header).
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*/
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unsigned long restore_jump_address;
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/*
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* Value of the cr3 register from before the hibernation (this value is passed
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* in the image header).
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*/
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unsigned long restore_cr3;
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pgd_t *temp_level4_pgt;
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void *relocated_restore_code;
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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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.pmd_flag = __PAGE_KERNEL_LARGE_EXEC,
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.kernel_mapping = true,
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};
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unsigned long mstart, mend;
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int result;
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int i;
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temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC);
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if (!temp_level4_pgt)
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return -ENOMEM;
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/* It is safe to reuse the original kernel mapping */
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set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map),
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init_level4_pgt[pgd_index(__START_KERNEL_map)]);
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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, temp_level4_pgt,
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mstart, mend);
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if (result)
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return result;
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}
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return 0;
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}
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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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if ((error = set_up_temporary_mappings()))
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return error;
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relocated_restore_code = (void *)get_safe_page(GFP_ATOMIC);
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if (!relocated_restore_code)
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return -ENOMEM;
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memcpy(relocated_restore_code, &core_restore_code,
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&restore_registers - &core_restore_code);
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restore_image();
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return 0;
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}
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/*
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* pfn_is_nosave - check if given pfn is in the 'nosave' section
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*/
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int pfn_is_nosave(unsigned long pfn)
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{
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unsigned long nosave_begin_pfn = __pa_symbol(&__nosave_begin) >> PAGE_SHIFT;
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unsigned long nosave_end_pfn = PAGE_ALIGN(__pa_symbol(&__nosave_end)) >> PAGE_SHIFT;
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return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
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}
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struct restore_data_record {
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unsigned long jump_address;
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unsigned long cr3;
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unsigned long magic;
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};
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#define RESTORE_MAGIC 0x0123456789ABCDEFUL
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/**
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* arch_hibernation_header_save - populate the architecture specific part
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* of a hibernation image header
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* @addr: address to save the data at
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*/
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int arch_hibernation_header_save(void *addr, unsigned int max_size)
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{
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struct restore_data_record *rdr = addr;
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if (max_size < sizeof(struct restore_data_record))
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return -EOVERFLOW;
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rdr->jump_address = restore_jump_address;
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rdr->cr3 = restore_cr3;
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rdr->magic = RESTORE_MAGIC;
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return 0;
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}
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/**
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* arch_hibernation_header_restore - read the architecture specific data
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* from the hibernation image header
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* @addr: address to read the data from
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*/
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int arch_hibernation_header_restore(void *addr)
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{
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struct restore_data_record *rdr = addr;
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restore_jump_address = rdr->jump_address;
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restore_cr3 = rdr->cr3;
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return (rdr->magic == RESTORE_MAGIC) ? 0 : -EINVAL;
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}
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