[PATCH RFC 3/6] efi: Add EFI_MEMORY_ISA_{MASK,VALID}

[Sven Peter <sven@kernel.org>]

As defined in UEFI 2.10, Section 7.2.3 [1], if EFI_MEMORY_ISA_VALID is
set the memory region is to be mapped using ISA-specific cacheability
attributes found in EFI_MEMORY_ISA_MASK. On AArch64, these bits are e.g.
defined as the attributes stored in MAIR [2].

[1] https://uefi.org/specs/UEFI/2.10/07_Services_Boot_Services.html#efi-boot-services-getmemorymap
[2] https://uefi.org/specs/UEFI/2.10/02_Overview.html#memory-types

Signed-off-by: Sven Peter <sven@kernel.org>
---
 include/linux/efi.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/efi.h b/include/linux/efi.h
index f3db3a18b540..882148114068 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -128,6 +128,8 @@ typedef	struct {
 #define EFI_MEMORY_SP			BIT_ULL(18)	/* soft reserved */
 #define EFI_MEMORY_CPU_CRYPTO		BIT_ULL(19)	/* supports encryption */
 #define EFI_MEMORY_HOT_PLUGGABLE	BIT_ULL(20)	/* supports unplugging at runtime */
+#define EFI_MEMORY_ISA_MASK		GENMASK_ULL(59, 44)	/* ISA-specific attributes */
+#define EFI_MEMORY_ISA_VALID		BIT_ULL(62)	/* EFI_MEMORY_ISA_MASK bits are valid */
 #define EFI_MEMORY_RUNTIME		BIT_ULL(63)	/* range requires runtime mapping */
 
 #define EFI_MEMORY_DESCRIPTOR_VERSION	1

-- 
2.55.0