From: Sai Praneeth <[email protected]> UEFI v2.6 introduces a configuration table called EFI_MEMORY_ATTRIBUTES_TABLE which provides additional information about efi runtime regions. Currently this table describes memory protections that may be applied to EFI Runtime code and data regions by kernel. Allocate a EFI_XXX bit to keep track of whether this feature is published by firmware or not.
Signed-off-by: Sai Praneeth Prakhya <[email protected]> Cc: Lee, Chun-Yi <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Ricardo Neri <[email protected]> Cc: Matt Fleming <[email protected]> Cc: Ard Biesheuvel <[email protected]> Cc: Ravi Shankar <[email protected]> Cc: Fenghua Yu <[email protected]> --- drivers/firmware/efi/memattr.c | 1 + include/linux/efi.h | 1 + 2 files changed, 2 insertions(+) diff --git a/drivers/firmware/efi/memattr.c b/drivers/firmware/efi/memattr.c index 236004b9a50d..402197460507 100644 --- a/drivers/firmware/efi/memattr.c +++ b/drivers/firmware/efi/memattr.c @@ -43,6 +43,7 @@ int __init efi_memattr_init(void) tbl_size = sizeof(*tbl) + tbl->num_entries * tbl->desc_size; memblock_reserve(efi.mem_attr_table, tbl_size); + set_bit(EFI_MEM_ATTR, &efi.flags); unmap: early_memunmap(tbl, sizeof(*tbl)); diff --git a/include/linux/efi.h b/include/linux/efi.h index a07a476178cd..41047ea555e3 100644 --- a/include/linux/efi.h +++ b/include/linux/efi.h @@ -1063,6 +1063,7 @@ extern int __init efi_setup_pcdp_console(char *); #define EFI_ARCH_1 7 /* First arch-specific bit */ #define EFI_DBG 8 /* Print additional debug info at runtime */ #define EFI_NX_PE_DATA 9 /* Can runtime data regions be mapped non-executable? */ +#define EFI_MEM_ATTR 10 /* Did firmware publish EFI_MEMORY_ATTRIBUTES table? */ #ifdef CONFIG_EFI /* -- 2.1.4
