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Commit a19ebf59 authored by Sai Praneeth's avatar Sai Praneeth Committed by Ingo Molnar
Browse files

efi: Introduce the EFI_MEM_ATTR bit and set it from the memory attributes table 



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 the EFI Runtime code and data regions by the kernel.

Allocate a EFI_XXX bit to keep track of whether this feature is
published by firmware or not.

Signed-off-by: default avatarSai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>
Signed-off-by: default avatarMatt Fleming <matt@codeblueprint.co.uk>
Signed-off-by: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: default avatarLee, Chun-Yi <jlee@suse.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Shankar <ravi.v.shankar@intel.com>
Cc: Ricardo Neri <ricardo.neri@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-efi@vger.kernel.org
Link: http://lkml.kernel.org/r/1485868902-20401-5-git-send-email-ard.biesheuvel@linaro.org


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 3a6b6c6f

drivers/firmware/efi/memattr.c

+1 −0
Original line number Original line Diff line number Diff line
@@ -43,6 +43,7 @@ int __init efi_memattr_init(void) 




	tbl_size = sizeof(*tbl) + tbl->num_entries * tbl->desc_size;

	tbl_size = sizeof(*tbl) + tbl->num_entries * tbl->desc_size;

	memblock_reserve(efi.mem_attr_table, tbl_size);

	memblock_reserve(efi.mem_attr_table, tbl_size);

	set_bit(EFI_MEM_ATTR, &efi.flags);





unmap:

unmap:

	early_memunmap(tbl, sizeof(*tbl));

	early_memunmap(tbl, sizeof(*tbl));

include/linux/efi.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -1065,6 +1065,7 @@ extern int __init efi_setup_pcdp_console(char *); 
#define EFI_ARCH_1		7	/* First arch-specific bit */

#define EFI_ARCH_1		7	/* First arch-specific bit */

#define EFI_DBG			8	/* Print additional debug info at runtime */

#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_NX_PE_DATA		9	/* Can runtime data regions be mapped non-executable? */

#define EFI_MEM_ATTR		10	/* Did firmware publish an EFI_MEMORY_ATTRIBUTES table? */





#ifdef CONFIG_EFI

#ifdef CONFIG_EFI

/*

/*