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efi/x86: Add kernel preferred address to PE header 

Store the kernel's link address as ImageBase in the PE header. Note that
the PE specification requires the ImageBase to be 64k aligned. The
preferred address should almost always satisfy that, except for 32-bit
kernel if the configuration has been customized.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200303221205.4048668-4-nivedita@alum.mit.edu
Link: https://lore.kernel.org/r/20200308080859.21568-18-ardb@kernel.org
This commit is contained in:
Arvind Sankar 2020-03-08 09:08:48 +01:00 committed by Ingo Molnar
parent 1887c9b653
commit 26725192c4
1 changed files with 4 additions and 2 deletions
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6
arch/x86/boot/header.S
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@ -138,10 +138,12 @@ optional_header:
#endif
extra_header_fields:
# PE specification requires ImageBase to be 64k aligned
.set image_base, (LOAD_PHYSICAL_ADDR + 0xffff) & ~0xffff
#ifdef CONFIG_X86_32
.long 0 # ImageBase
.long image_base # ImageBase
#else
.quad 0 # ImageBase
.quad image_base # ImageBase
#endif
.long 0x20 # SectionAlignment
.long 0x20 # FileAlignment