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x86/boot: Grab kernel_info offset from zoffset header directly

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Instead of parsing zoffset.h and poking the kernel_info offset value
into the header from the build tool, just grab the value directly in the
asm file that describes this header.

This change has no impact on the resulting bzImage binary.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230915171623.655440-11-ardb@google.com
This commit is contained in:
Ard Biesheuvel 2023-09-15 17:16:25 +00:00 committed by Ingo Molnar
parent b618d31f11
commit 2e765c02dc
2 changed files with 1 additions and 5 deletions
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2
arch/x86/boot/header.S
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@ -526,7 +526,7 @@ pref_address: .quad LOAD_PHYSICAL_ADDR # preferred load addr
init_size: .long INIT_SIZE # kernel initialization size
handover_offset: .long 0 # Filled in by build.c
kernel_info_offset: .long 0 # Filled in by build.c
kernel_info_offset: .long ZO_kernel_info
# End of setup header #####################################################

4
arch/x86/boot/tools/build.c
View File

@ -59,7 +59,6 @@ static unsigned long efi32_stub_entry;
static unsigned long efi64_stub_entry;
static unsigned long efi_pe_entry;
static unsigned long efi32_pe_entry;
static unsigned long kernel_info;
static unsigned long _end;
/*----------------------------------------------------------------------*/
@ -337,7 +336,6 @@ static void parse_zoffset(char *fname)
PARSE_ZOFS(p, efi64_stub_entry);
PARSE_ZOFS(p, efi_pe_entry);
PARSE_ZOFS(p, efi32_pe_entry);
PARSE_ZOFS(p, kernel_info);
PARSE_ZOFS(p, _end);
p = strchr(p, '\n');
@ -419,8 +417,6 @@ int main(int argc, char ** argv)
update_pecoff_text(setup_sectors * 512, i + (sys_size * 16));
efi_stub_entry_update();
/* Update kernel_info offset. */
put_unaligned_le32(kernel_info, &buf[0x268]);
crc = partial_crc32(buf, i, crc);
if (fwrite(buf, 1, i, dest) != i)