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arch|cpu/x86: Add Kconfig option for x86 reset vector 

Prepare for an implementation supporting the reset vector in RAM and
not the traditional 0xfffffff0.  Add a Kconfig symbol that can be used
in place of hardcoded values.

Change-Id: I6a814f7179ee4251aeeccb2555221616e944e03d
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37485
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
This commit is contained in:
Marshall Dawson 2019-11-01 17:30:05 -06:00 committed by Patrick Georgi
parent 4ba70a7575
commit 67910db907
6 changed files with 19 additions and 11 deletions
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10
src/arch/x86/Kconfig
View File

@ -87,6 +87,16 @@ config AP_IN_SIPI_WAIT
default n
depends on ARCH_X86 && SMP
config X86_RESET_VECTOR
hex
depends on ARCH_X86
default 0xfffffff0
help
Specify the location of the x86 reset vector. In traditional devices
this must match the architectural reset vector to produce a bootable
image. Nontraditional designs may use this to position the reset
vector into its desired location.
config RESET_VECTOR_IN_RAM
bool
depends on ARCH_X86

2
src/arch/x86/failover.ld
View File

@ -14,7 +14,7 @@
ENTRY(_start)
MEMORY {
rom : ORIGIN = 0xffff0000, LENGTH = 64K
rom : ORIGIN = CONFIG_X86_RESET_VECTOR - 0xfff0, LENGTH = 64K
}
TARGET(binary)

2
src/arch/x86/id.ld
View File

@ -12,7 +12,7 @@
*/
SECTIONS {
. = (0xffffffff - CONFIG_ID_SECTION_OFFSET) - (__id_end - __id_start) + 1;
. = (CONFIG_X86_RESET_VECTOR - CONFIG_ID_SECTION_OFFSET) - (__id_end - __id_start) + 0x10;
.id (.): {
KEEP(*(.id))
}

2
src/arch/x86/memlayout.ld
View File

@ -50,7 +50,7 @@ SECTIONS
#include EARLY_MEMLAYOUT
#elif ENV_BOOTBLOCK
/* arch/x86/bootblock.ld contains the logic for the ROMCC_BOOTBLOCK linking. */
BOOTBLOCK(0xffffffff - CONFIG_C_ENV_BOOTBLOCK_SIZE + 1,
BOOTBLOCK(CONFIG_X86_RESET_VECTOR - CONFIG_C_ENV_BOOTBLOCK_SIZE + 0x10,
CONFIG_C_ENV_BOOTBLOCK_SIZE)
#include EARLY_MEMLAYOUT

2
src/cpu/intel/fit/fit.ld
View File

@ -12,7 +12,7 @@
*/
SECTIONS {
. = 0xffffffc0;
. = CONFIG_X86_RESET_VECTOR - 0x30; /* 0xffffffc0 */
.fit_pointer (.): {
KEEP(*(.fit_pointer))
}

12
src/cpu/x86/16bit/reset16.ld
View File

@ -11,16 +11,14 @@
* GNU General Public License for more details.
*/
/*
* _ROMTOP : The top of the ROM used where we
* need to put the reset vector.
*/
/* _RESET_VECTOR: typically the top of the ROM */
SECTIONS {
/* Trigger an error if I have an unuseable start address */
_bogus = ASSERT(_start16bit >= 0xffff0000, "_start16bit too low. Please report.");
_ROMTOP = 0xfffffff0;
. = _ROMTOP;
_TOO_LOW = CONFIG_X86_RESET_VECTOR - 0xfff0;
_bogus = ASSERT(_start16bit >= _TOO_LOW, "_start16bit too low. Please report.");
. = CONFIG_X86_RESET_VECTOR;
.reset . : {
*(.reset);
. = 15;