diff options
| author | Subrata Banik <subrata.banik@intel.com> | 2019-08-22 11:30:52 +0530 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2019-09-11 14:45:38 +0000 |
| commit | 8edc6dc91f4a46cca81f99101fb13423615c586a (patch) | |
| tree | 6d27bec4af66d7304322497b2bf4412235f11c7b /src/arch | |
| parent | d2496576f1b70ebb2a4e90d525f26be13f6a01f9 (diff) | |
arch/x86: Cache the TSEG region at the top of ram
This patch adds new API for enabling caching for the TSEG region
and setting up required MTRR for next stage.
BUG=b:140008206
TEST=Build and boot CML-Hatch.
Change-Id: I59432c02e04af1b931d77de3f6652b0327ca82bb
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/34995
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Diffstat (limited to 'src/arch')
| -rw-r--r-- | src/arch/x86/include/arch/romstage.h | 9 | ||||
| -rw-r--r-- | src/arch/x86/postcar_loader.c | 18 |
2 files changed, 27 insertions, 0 deletions
diff --git a/src/arch/x86/include/arch/romstage.h b/src/arch/x86/include/arch/romstage.h index 2ac225875f..15c93f24bd 100644 --- a/src/arch/x86/include/arch/romstage.h +++ b/src/arch/x86/include/arch/romstage.h @@ -88,4 +88,13 @@ void run_postcar_phase(struct postcar_frame *pcf); */ void late_car_teardown(void); +/* + * Cache the TSEG region at the top of ram. This region is + * not restricted to SMM mode until SMM has been relocated. + * By setting the region to cacheable it provides faster access + * when relocating the SMM handler as well as using the TSEG + * region for other purposes. + */ +void postcar_enable_tseg_cache(struct postcar_frame *pcf); + #endif /* __ARCH_ROMSTAGE_H__ */ diff --git a/src/arch/x86/postcar_loader.c b/src/arch/x86/postcar_loader.c index 10a9ca2ace..c6149ab26a 100644 --- a/src/arch/x86/postcar_loader.c +++ b/src/arch/x86/postcar_loader.c @@ -17,6 +17,7 @@ #include <cpu/cpu.h> #include <cpu/x86/msr.h> #include <cpu/x86/mtrr.h> +#include <cpu/x86/smm.h> #include <program_loading.h> #include <rmodule.h> #include <romstage_handoff.h> @@ -187,6 +188,23 @@ static void load_postcar_cbfs(struct prog *prog, struct postcar_frame *pcf) stage_cache_add(STAGE_POSTCAR, prog); } +/* + * Cache the TSEG region at the top of ram. This region is + * not restricted to SMM mode until SMM has been relocated. + * By setting the region to cacheable it provides faster access + * when relocating the SMM handler as well as using the TSEG + * region for other purposes. + */ +void postcar_enable_tseg_cache(struct postcar_frame *pcf) +{ + uintptr_t smm_base; + size_t smm_size; + + smm_region(&smm_base, &smm_size); + postcar_frame_add_mtrr(pcf, smm_base, smm_size, + MTRR_TYPE_WRBACK); +} + void run_postcar_phase(struct postcar_frame *pcf) { struct prog prog = |