| /* |
| * Hibernation support for x86-64 |
| * |
| * Distribute under GPLv2 |
| * |
| * 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 <asm/init.h> |
| #include <asm/proto.h> |
| #include <asm/page.h> |
| #include <asm/pgtable.h> |
| #include <asm/mtrr.h> |
| #include <asm/sections.h> |
| #include <asm/suspend.h> |
| |
| /* Defined in hibernate_asm_64.S */ |
| extern asmlinkage 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 __visible; |
| |
| /* |
| * Value of the cr3 register from before the hibernation (this value is passed |
| * in the image header). |
| */ |
| unsigned long restore_cr3 __visible; |
| |
| pgd_t *temp_level4_pgt __visible; |
| |
| void *relocated_restore_code __visible; |
| |
| 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, |
| .pmd_flag = __PAGE_KERNEL_LARGE_EXEC, |
| .kernel_mapping = true, |
| }; |
| unsigned long mstart, mend; |
| int result; |
| int i; |
| |
| 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 */ |
| 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, temp_level4_pgt, |
| mstart, mend); |
| |
| if (result) |
| return result; |
| } |
| |
| 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; |
| } |