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arch/x86: Top-align .init in bootblock

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Link .init section near the end of bootblock program.
It contains _start16bit, gdtptr and gdt that must be
addressable from realmode, thus within top 64 KiB.

Change-Id: If7b9737650362ac7cd82685cfdfaf18bd2429238
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47970
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
commit 2289a70b6f
5 changed files with 48 additions and 5 deletions
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16
src/soc/amd/common/block/cpu/noncar/memlayout_x86.ld
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@ -110,6 +110,22 @@ SECTIONS {
_TOO_LOW = _X86_RESET_VECTOR - 0xfff0;
_bogus = ASSERT(_start16bit >= _TOO_LOW, "_start16bit too low. Please report.");
. = _X86_RESET_VECTOR - EARLYASM_SZ;
. = ALIGN(16);
BOOTBLOCK_TOP = .;
.init (.) : {
*(.init._start);
*(.init);
*(.init.*);
}
/*
* Allocation reserves extra space here. Alignment requirements
* may cause the total size of a section to change when the start
* address gets applied.
*/
EARLYASM_SZ = SIZEOF(.init) + 16;
. = BOOTBLOCK_END - 0x10;
_X86_RESET_VECTOR = .;
.reset . : {