From 2289a70b6f5fa14f3e008bc6041d8a8bd4ef956b Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ky=C3=B6sti=20M=C3=A4lkki?= Date: Sat, 21 Dec 2019 10:17:56 +0200 Subject: arch/x86: Top-align .init in bootblock MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-on: https://review.coreboot.org/c/coreboot/+/47970 Tested-by: build bot (Jenkins) Reviewed-by: Arthur Heymans --- src/arch/x86/bootblock.ld | 32 ++++++++++++++++++++++++++++++-- src/arch/x86/memlayout.ld | 2 -- 2 files changed, 30 insertions(+), 4 deletions(-) (limited to 'src/arch') diff --git a/src/arch/x86/bootblock.ld b/src/arch/x86/bootblock.ld index 479259fcbe..65952621d9 100644 --- a/src/arch/x86/bootblock.ld +++ b/src/arch/x86/bootblock.ld @@ -12,8 +12,27 @@ ap_sipi_vector_in_rom = (_start16bit >> 12) & 0xff; #endif SECTIONS { - /* Trigger an error if I have an unusable start address */ - _bogus = ASSERT(_start16bit >= 0xffff0000, "_start16bit too low. Please report."); + . = _ebootblock - CONFIG_C_ENV_BOOTBLOCK_SIZE; + + _bootblock = .; + + INCLUDE "bootblock/lib/program.ld" + + . = MIN(_ID_SECTION, _FIT_POINTER) - EARLYASM_SZ; + . = CONFIG(SIPI_VECTOR_IN_ROM) ? ALIGN(4096) : 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) + (CONFIG(SIPI_VECTOR_IN_ROM) ? 4096 : 16); . = _ID_SECTION; .id (.): { @@ -37,4 +56,13 @@ SECTIONS { . = 15; BYTE(0x00); } + _ebootblock = .; } + +/* + * Tests _bogus1 and _bogus2 are here to detect case of symbol addresses truncated + * to 32 bits and intermediate files reaching size of close to 4 GiB. + */ +_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."); diff --git a/src/arch/x86/memlayout.ld b/src/arch/x86/memlayout.ld index 52694fa360..a0b0f536ff 100644 --- a/src/arch/x86/memlayout.ld +++ b/src/arch/x86/memlayout.ld @@ -28,8 +28,6 @@ SECTIONS #include "car.ld" #elif ENV_BOOTBLOCK - BOOTBLOCK(0xffffffff - CONFIG_C_ENV_BOOTBLOCK_SIZE + 1, - CONFIG_C_ENV_BOOTBLOCK_SIZE) #include "car.ld" -- cgit v1.2.3