diff options
| author | Shuo Liu <shuo.liu@intel.com> | 2022-07-05 02:37:16 +0800 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2024-10-02 14:15:19 +0000 |
| commit | b90fac1cfe2fc858e60b6875752ea9dc69b72850 (patch) | |
| tree | b5cae74cc656d47db46e6e319f3dcd3f32b59968 /src/arch | |
| parent | a0975050fa01d9dd5d20531de9727a694eb60e4c (diff) | |
arch/x86: Shadow ROM tables into EBDA
For platforms without writable PAM-F segment support (e.g. some
simics virtual platforms), put ROM table pointers (e.g. ACPI/SMBIOS
low pointers) into EBDA.
Signed-off-by: Shuo Liu <shuo.liu@intel.com>
Signed-off-by: Gang Chen <gang.c.chen@intel.com>
Signed-off-by: Jincheng Li <jincheng.li@intel.com>
Change-Id: I2aac74708279813f9a848044d470fdc980ea4305
Reviewed-on: https://review.coreboot.org/c/coreboot/+/84322
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/x86/Kconfig | 7 | ||||
| -rw-r--r-- | src/arch/x86/tables.c | 11 |
2 files changed, 17 insertions, 1 deletions
diff --git a/src/arch/x86/Kconfig b/src/arch/x86/Kconfig index 4737e3cca1..2db526e34c 100644 --- a/src/arch/x86/Kconfig +++ b/src/arch/x86/Kconfig @@ -439,4 +439,11 @@ config DEFAULT_EBDA_SIZE default 0x400 help The default value of EBDA size is 0x400. + +config SHADOW_ROM_TABLE_TO_EBDA + bool + default n + help + For platforms without writable PAM-F segment support. Put ROM table + pointers (e.g. ACPI/SMBIOS low pointers) into EBDA. endif diff --git a/src/arch/x86/tables.c b/src/arch/x86/tables.c index 273263820b..e47f1bce97 100644 --- a/src/arch/x86/tables.c +++ b/src/arch/x86/tables.c @@ -192,7 +192,12 @@ static uintptr_t forwarding_table = FORWARDING_TABLE_ADDR; void arch_write_tables(uintptr_t coreboot_table) { size_t sz; - unsigned long rom_table_end = 0xf0000; + unsigned long rom_table_end; + + if (CONFIG(SHADOW_ROM_TABLE_TO_EBDA)) + rom_table_end = CONFIG_DEFAULT_EBDA_SEGMENT << 4; + else + rom_table_end = 0xf0000; /* This table must be between 0x0f0000 and 0x100000 */ if (CONFIG(GENERATE_PIRQ_TABLE)) @@ -224,4 +229,8 @@ void bootmem_arch_add_ranges(void) const uintptr_t base = 0; bootmem_add_range(base, forwarding_table - base, BM_MEM_TABLE); + + /* Reserve Extend BIOS Data Area (EBDA) region explicitly */ + bootmem_add_range((uintptr_t)CONFIG_DEFAULT_EBDA_SEGMENT << 4, + CONFIG_DEFAULT_EBDA_SIZE, BM_MEM_TABLE); } |