diff options
| author | Simon Glass | 2020-09-22 14:54:51 -0600 |
|---|---|---|
| committer | Bin Meng | 2020-09-25 11:27:27 +0800 |
| commit | 29d2d64ed55f2dfaff6d298b0f589ea0f8edef8d (patch) | |
| tree | ddca703f01f651b8ac155ab17c802fcc9b00f0eb /arch | |
| parent | 51af144eb7a0bba3f54991059920ceccd83ddc91 (diff) | |
x86: Add support for more than 8 MTRRs
At present the mtrr command only support 8 MTRRs. Some SoCs have more than
that. Update the implementation to support up to 10. Read the number of
MTRRs dynamically instead.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/cpu/mtrr.c | 12 | ||||
| -rw-r--r-- | arch/x86/include/asm/mtrr.h | 15 |
2 files changed, 19 insertions, 8 deletions
diff --git a/arch/x86/cpu/mtrr.c b/arch/x86/cpu/mtrr.c index 08fa80f8bc7..5180eb06fcd 100644 --- a/arch/x86/cpu/mtrr.c +++ b/arch/x86/cpu/mtrr.c @@ -67,9 +67,10 @@ static void set_var_mtrr(uint reg, uint type, uint64_t start, uint64_t size) void mtrr_read_all(struct mtrr_info *info) { + int reg_count = mtrr_get_var_count(); int i; - for (i = 0; i < MTRR_COUNT; i++) { + for (i = 0; i < reg_count; i++) { info->mtrr[i].base = native_read_msr(MTRR_PHYS_BASE_MSR(i)); info->mtrr[i].mask = native_read_msr(MTRR_PHYS_MASK_MSR(i)); } @@ -77,10 +78,11 @@ void mtrr_read_all(struct mtrr_info *info) void mtrr_write_all(struct mtrr_info *info) { + int reg_count = mtrr_get_var_count(); struct mtrr_state state; int i; - for (i = 0; i < MTRR_COUNT; i++) { + for (i = 0; i < reg_count; i++) { mtrr_open(&state, true); wrmsrl(MTRR_PHYS_BASE_MSR(i), info->mtrr[i].base); wrmsrl(MTRR_PHYS_MASK_MSR(i), info->mtrr[i].mask); @@ -156,7 +158,7 @@ int mtrr_commit(bool do_caches) /* Clear the ones that are unused */ debug("clear\n"); - for (; i < MTRR_COUNT; i++) + for (; i < MTRR_MAX_COUNT; i++) wrmsrl(MTRR_PHYS_MASK_MSR(i), 0); debug("close\n"); mtrr_close(&state, do_caches); @@ -196,7 +198,7 @@ int mtrr_add_request(int type, uint64_t start, uint64_t size) return 0; } -static int get_var_mtrr_count(void) +int mtrr_get_var_count(void) { return msr_read(MSR_MTRR_CAP_MSR).lo & MSR_MTRR_CAP_VCNT; } @@ -207,7 +209,7 @@ static int get_free_var_mtrr(void) int vcnt; int i; - vcnt = get_var_mtrr_count(); + vcnt = mtrr_get_var_count(); /* Identify the first var mtrr which is not valid */ for (i = 0; i < vcnt; i++) { diff --git a/arch/x86/include/asm/mtrr.h b/arch/x86/include/asm/mtrr.h index 48db1dd82f7..3a98aacdef5 100644 --- a/arch/x86/include/asm/mtrr.h +++ b/arch/x86/include/asm/mtrr.h @@ -36,8 +36,8 @@ #define MTRR_BASE_TYPE_MASK 0x7 -/* Number of MTRRs supported */ -#define MTRR_COUNT 8 +/* Maximum number of MTRRs supported - see also mtrr_get_var_count() */ +#define MTRR_MAX_COUNT 10 #define NUM_FIXED_MTRRS 11 #define RANGES_PER_FIXED_MTRR 8 @@ -87,7 +87,7 @@ struct mtrr { * @mtrr: Information about each mtrr */ struct mtrr_info { - struct mtrr mtrr[MTRR_COUNT]; + struct mtrr mtrr[MTRR_MAX_COUNT]; }; /** @@ -180,6 +180,15 @@ int mtrr_set_valid(int cpu_select, int reg, bool valid); */ int mtrr_set(int cpu_select, int reg, u64 base, u64 mask); +/** + * mtrr_get_var_count() - Get the number of variable MTRRs + * + * Some CPUs have more than 8 MTRRs. This function returns the actual number + * + * @return number of variable MTRRs + */ +int mtrr_get_var_count(void); + #endif #if ((CONFIG_XIP_ROM_SIZE & (CONFIG_XIP_ROM_SIZE - 1)) != 0) |