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| author | Raul E Rangel <rrangel@chromium.org> | 2020-04-27 15:47:18 -0600 |
|---|---|---|
| committer | Aaron Durbin <adurbin@chromium.org> | 2020-04-29 04:59:56 +0000 |
| commit | 3ae3ff28286f1e752f01ccf9480414ff1d82615f (patch) | |
| tree | 57579c2d77f8ee36fa5f4527617333faca91d0ed | |
| parent | fa52f31e114d7d15b49dca448832138c884138cd (diff) | |
| download | coreboot-3ae3ff28286f1e752f01ccf9480414ff1d82615f.tar.xz | |
src/cpu/x86/mtrr/earlymtrr: Add clear_all_var_mtrr
Picasso does not define the state of variable MTRRs on boot. Add a
helper function to clear all MTRRs.
BUG=b:147042464
TEST=Build trembyle
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: I21b887ce12849a95ddd8f1698028fb6bbfb4a7f6
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40764
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
| -rw-r--r-- | src/cpu/x86/mtrr/earlymtrr.c | 14 | ||||
| -rw-r--r-- | src/include/cpu/x86/mtrr.h | 1 |
2 files changed, 15 insertions, 0 deletions
diff --git a/src/cpu/x86/mtrr/earlymtrr.c b/src/cpu/x86/mtrr/earlymtrr.c index 4d14a8de08..e4003591f9 100644 --- a/src/cpu/x86/mtrr/earlymtrr.c +++ b/src/cpu/x86/mtrr/earlymtrr.c @@ -42,3 +42,17 @@ void set_var_mtrr( maskm.hi = (1 << (cpu_phys_address_size() - 32)) - 1; wrmsr(MTRR_PHYS_MASK(reg), maskm); } + +void clear_all_var_mtrr(void) +{ + msr_t mtrr = {0, 0}; + int vcnt; + int i; + + vcnt = get_var_mtrr_count(); + + for (i = 0; i < vcnt; i++) { + wrmsr(MTRR_PHYS_MASK(i), mtrr); + wrmsr(MTRR_PHYS_BASE(i), mtrr); + } +} diff --git a/src/include/cpu/x86/mtrr.h b/src/include/cpu/x86/mtrr.h index 07db3cb606..50148ffd35 100644 --- a/src/include/cpu/x86/mtrr.h +++ b/src/include/cpu/x86/mtrr.h @@ -107,6 +107,7 @@ static inline int get_var_mtrr_count(void) void set_var_mtrr(unsigned int reg, unsigned int base, unsigned int size, unsigned int type); int get_free_var_mtrr(void); +void clear_all_var_mtrr(void); asmlinkage void display_mtrrs(void); |