Commit 26725192 authored Mar 08, 2020 by Arvind Sankar Committed by Ingo Molnar Mar 08, 2020

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

parent 1887c9b6

arch/x86/boot/header.S

+4 −2

Original line number	Diff line number	Diff line
		@@ -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