Commit 87db73ae authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Ingo Molnar
Browse files

efi: Add support for EFI_MEMORY_RO attribute introduced by UEFIv2.5 



The UEFI spec v2.5 introduces a new memory attribute
EFI_MEMORY_RO, which is now the preferred attribute to convey
that the nature of the contents of such a region allows it to be
mapped read-only (i.e., it contains .text and .rodata only).

The specification of the existing EFI_MEMORY_WP attribute has been
updated to align more closely with its common use as a
cacheability attribute rather than a permission attribute.

Add the #define and add the attribute to the memory map dumping
routine.

Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: default avatarMatt Fleming <matt.fleming@intel.com>
Reviewed-by: default avatarLaszlo Ersek <lersek@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1438936621-5215-1-git-send-email-matt@codeblueprint.co.uk


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent dd2384a7

drivers/firmware/efi/efi.c

+5 −3
Original line number Diff line number Diff line
@@ -588,16 +588,18 @@ char * __init efi_md_typeattr_format(char *buf, size_t size, 


	attr = md->attribute;

	if (attr & ~(EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_WT |

		     EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_WP |

		     EFI_MEMORY_RP | EFI_MEMORY_XP | EFI_MEMORY_RUNTIME))

		     EFI_MEMORY_WB | EFI_MEMORY_UCE | EFI_MEMORY_RO |

		     EFI_MEMORY_WP | EFI_MEMORY_RP | EFI_MEMORY_XP |

		     EFI_MEMORY_RUNTIME))

		snprintf(pos, size, "|attr=0x%016llx]",

			 (unsigned long long)attr);

	else

		snprintf(pos, size, "|%3s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]",

		snprintf(pos, size, "|%3s|%2s|%2s|%2s|%2s|%3s|%2s|%2s|%2s|%2s]",

			 attr & EFI_MEMORY_RUNTIME ? "RUN" : "",

			 attr & EFI_MEMORY_XP      ? "XP"  : "",

			 attr & EFI_MEMORY_RP      ? "RP"  : "",

			 attr & EFI_MEMORY_WP      ? "WP"  : "",

			 attr & EFI_MEMORY_RO      ? "RO"  : "",

			 attr & EFI_MEMORY_UCE     ? "UCE" : "",

			 attr & EFI_MEMORY_WB      ? "WB"  : "",

			 attr & EFI_MEMORY_WT      ? "WT"  : "",

include/linux/efi.h

+1 −0
Original line number Diff line number Diff line
@@ -99,6 +99,7 @@ typedef struct { 
#define EFI_MEMORY_XP		((u64)0x0000000000004000ULL)	/* execute-protect */

#define EFI_MEMORY_MORE_RELIABLE \

				((u64)0x0000000000010000ULL)	/* higher reliability */

#define EFI_MEMORY_RO		((u64)0x0000000000020000ULL)	/* read-only */

#define EFI_MEMORY_RUNTIME	((u64)0x8000000000000000ULL)	/* range requires runtime mapping */

#define EFI_MEMORY_DESCRIPTOR_VERSION	1

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