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x86: Add support for more than 8 MTRRs

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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>
This commit is contained in:
Simon Glass
2020-09-22 14:54:51 -06:00
committed by Bin Meng
parent 51af144eb7
commit 29d2d64ed5
3 changed files with 24 additions and 12 deletions
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15
arch/x86/include/asm/mtrr.h
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@@ -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)