diff options
Diffstat (limited to 'drivers/firmware/efi/efi.c')
| -rw-r--r-- | drivers/firmware/efi/efi.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 5a2631af7410..c1879999abe7 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -544,6 +544,52 @@ int __init efi_config_init(efi_config_table_type_t *arch_tables) return ret; } +/** + * efi_memmap_init_early - Map the EFI memory map data structure + * @data: EFI memory map data + * + * Use early_memremap() to map the passed in EFI memory map and assign + * it to efi.memmap. + */ +int __init efi_memmap_init_early(struct efi_memory_map_data *data) +{ + struct efi_memory_map map; + + if (efi_enabled(EFI_PARAVIRT)) + return 0; + + map.phys_map = data->phys_map; + + map.map = early_memremap(data->phys_map, data->size); + if (!map.map) { + pr_err("Could not map the memory map!\n"); + return -ENOMEM; + } + + map.nr_map = data->size / data->desc_size; + map.map_end = map.map + data->size; + + map.desc_version = data->desc_version; + map.desc_size = data->desc_size; + + set_bit(EFI_MEMMAP, &efi.flags); + + efi.memmap = map; + + return 0; +} + +void __init efi_memmap_unmap(void) +{ + unsigned long size; + + size = efi.memmap.desc_size * efi.memmap.nr_map; + + early_memunmap(efi.memmap.map, size); + efi.memmap.map = NULL; + clear_bit(EFI_MEMMAP, &efi.flags); +} + #ifdef CONFIG_EFI_VARS_MODULE static int __init efi_load_efivars(void) { |