Split of the remapping code from efi_config_init() so that the caller can perform its own remapping. This is necessary to correctly handle virtually remapped UEFI memory regions under kexec, as efi.systab will have been updated to a virtual address.
Signed-off-by: Ard Biesheuvel ard.biesheuvel@linaro.org --- drivers/firmware/efi/efi.c | 49 +++++++++++++++++++++++++++++----------------- include/linux/efi.h | 2 ++ 2 files changed, 33 insertions(+), 18 deletions(-)
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c index 8590099ac148..3e72e3bfc8ab 100644 --- a/drivers/firmware/efi/efi.c +++ b/drivers/firmware/efi/efi.c @@ -289,9 +289,10 @@ static __init int match_config_table(efi_guid_t *guid, return 0; }
-int __init efi_config_init(efi_config_table_type_t *arch_tables) +int __init efi_config_parse_tables(void *config_tables, int count, + efi_config_table_type_t *arch_tables) { - void *config_tables, *tablep; + void *tablep; int i, sz;
if (efi_enabled(EFI_64BIT)) @@ -299,19 +300,9 @@ int __init efi_config_init(efi_config_table_type_t *arch_tables) else sz = sizeof(efi_config_table_32_t);
- /* - * Let's see what config tables the firmware passed to us. - */ - config_tables = early_memremap(efi.systab->tables, - efi.systab->nr_tables * sz); - if (config_tables == NULL) { - pr_err("Could not map Configuration table!\n"); - return -ENOMEM; - } - tablep = config_tables; pr_info(""); - for (i = 0; i < efi.systab->nr_tables; i++) { + for (i = 0; i < count; i++) { efi_guid_t guid; unsigned long table;
@@ -324,8 +315,6 @@ int __init efi_config_init(efi_config_table_type_t *arch_tables) if (table64 >> 32) { pr_cont("\n"); pr_err("Table located above 4GB, disabling EFI.\n"); - early_memunmap(config_tables, - efi.systab->nr_tables * sz); return -EINVAL; } #endif @@ -340,13 +329,37 @@ int __init efi_config_init(efi_config_table_type_t *arch_tables) tablep += sz; } pr_cont("\n"); - early_memunmap(config_tables, efi.systab->nr_tables * sz); - set_bit(EFI_CONFIG_TABLES, &efi.flags); - return 0; }
+int __init efi_config_init(efi_config_table_type_t *arch_tables) +{ + void *config_tables; + int sz, ret; + + if (efi_enabled(EFI_64BIT)) + sz = sizeof(efi_config_table_64_t); + else + sz = sizeof(efi_config_table_32_t); + + /* + * Let's see what config tables the firmware passed to us. + */ + config_tables = early_memremap(efi.systab->tables, + efi.systab->nr_tables * sz); + if (config_tables == NULL) { + pr_err("Could not map Configuration table!\n"); + return -ENOMEM; + } + + ret = efi_config_parse_tables(config_tables, efi.systab->nr_tables, + arch_tables); + + early_memunmap(config_tables, efi.systab->nr_tables * sz); + return ret; +} + #ifdef CONFIG_EFI_VARS_MODULE static int __init efi_load_efivars(void) { diff --git a/include/linux/efi.h b/include/linux/efi.h index 0949f9c7e872..97027fafebd4 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -871,6 +871,8 @@ static inline efi_status_t efi_query_variable_store(u32 attributes, unsigned lon #endif extern void __iomem *efi_lookup_mapped_addr(u64 phys_addr); extern int efi_config_init(efi_config_table_type_t *arch_tables); +extern int efi_config_parse_tables(void *config_tables, int count, + efi_config_table_type_t *arch_tables); extern u64 efi_get_iobase (void); extern u32 efi_mem_type (unsigned long phys_addr); extern u64 efi_mem_attributes (unsigned long phys_addr);