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arch/x86: Top-align .text in bootblock 

Move .text section closer to .init. This reduces the size
of the flat bootblock binary and footprint in CBFS.

Change-Id: I64325bd633e1104853cfb928c7f801d94ff3045a
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47971
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
This commit is contained in:
Kyösti Mälkki 2019-12-21 10:17:56 +02:00
parent 2289a70b6f
commit 49dbbe99c2
2 changed files with 18 additions and 0 deletions
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3
src/arch/x86/Kconfig
View File

@ -191,6 +191,9 @@ config C_ENV_BOOTBLOCK_SIZE
hex
default 0x10000
config FIXED_BOOTBLOCK_SIZE
bool
# Default address romstage is to be linked at
config ROMSTAGE_ADDR
hex

15
src/arch/x86/bootblock.ld
View File

@ -12,12 +12,25 @@ ap_sipi_vector_in_rom = (_start16bit >> 12) & 0xff;
#endif
SECTIONS {
#if CONFIG(FIXED_BOOTBLOCK_SIZE)
. = _ebootblock - CONFIG_C_ENV_BOOTBLOCK_SIZE;
#else
. = BOOTBLOCK_TOP - PROGRAM_SZ;
. = ALIGN(16);
#endif
_bootblock = .;
INCLUDE "bootblock/lib/program.ld"
/*
* Allocation reserves extra space here. Alignment requirements
* may cause the total size of a section to change when the start
* address gets applied.
*/
PROGRAM_SZ = SIZEOF(.text) + 512;
. = MIN(_ID_SECTION, _FIT_POINTER) - EARLYASM_SZ;
. = CONFIG(SIPI_VECTOR_IN_ROM) ? ALIGN(4096) : ALIGN(16);
BOOTBLOCK_TOP = .;
@ -66,3 +79,5 @@ SECTIONS {
_bogus1 = ASSERT(_bootblock & 0x80000000, "_bootblock too low, invalid ld script");
_bogus2 = ASSERT(_start16bit & 0x80000000, "_start16bit too low, invalid ld script");
_bogus3 = ASSERT(_start16bit >= 0xffff0000, "_start16bit too low. Please report.");
_bogus4 = ASSERT(_ebootblock - _bootblock <= CONFIG_C_ENV_BOOTBLOCK_SIZE,
"_bootblock too low, increase C_ENV_BOOTBLOCK_SIZE");