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Subject[PATCH 3/5] efi/x86: Add kernel preferred address to PE header
Date
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>
---
arch/x86/boot/header.S | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
index 4ee25e28996f..0d8d2cb28fd9 100644
--- a/arch/x86/boot/header.S
+++ b/arch/x86/boot/header.S
@@ -138,10 +138,12 @@ optional_header:
#endif

extra_header_fields:
+ # PE specification requires ImageBase to be 64k-aligned
+ .set ImageBase, (LOAD_PHYSICAL_ADDR+0xffff) & ~0xffff
#ifdef CONFIG_X86_32
- .long 0 # ImageBase
+ .long ImageBase # ImageBase
#else
- .quad 0 # ImageBase
+ .quad ImageBase # ImageBase
#endif
.long 0x20 # SectionAlignment
.long 0x20 # FileAlignment
--
2.24.1
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