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

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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: Sai Praneeth Prakhya <[email protected]>
Signed-off-by: Matt Fleming <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
Reviewed-by: Lee, Chun-Yi <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Shankar <[email protected]>
Cc: Ricardo Neri <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Sai Praneeth 2017-01-31 13:21:36 +00:00 • committed by Ingo Molnar
commit a19ebf59e2
2 changed files with 2 additions and 0 deletions
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1
drivers/firmware/efi/memattr.c
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@ -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));