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-rw-r--r--src/include/cpu/x86/mtrr.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/src/include/cpu/x86/mtrr.h b/src/include/cpu/x86/mtrr.h
index 2d7a8416c1..16efbb6eef 100644
--- a/src/include/cpu/x86/mtrr.h
+++ b/src/include/cpu/x86/mtrr.h
@@ -8,6 +8,22 @@
#include <arch/cpu.h>
#endif
+#define MTRR_VERBOSE_LEVEL BIOS_NEVER
+
+/* MTRRs are at a 4KiB granularity. */
+#define RANGE_SHIFT 12
+#define ADDR_SHIFT_TO_RANGE_SHIFT(x) \
+ (((x) > RANGE_SHIFT) ? ((x) - RANGE_SHIFT) : RANGE_SHIFT)
+#define PHYS_TO_RANGE_ADDR(x) ((x) >> RANGE_SHIFT)
+#define RANGE_TO_PHYS_ADDR(x) (((resource_t)(x)) << RANGE_SHIFT)
+
+/* Helpful constants. */
+#define RANGE_1MB PHYS_TO_RANGE_ADDR(1ULL << 20)
+#define RANGE_4GB (1ULL << (ADDR_SHIFT_TO_RANGE_SHIFT(32)))
+
+#define MTRR_ALGO_SHIFT (8)
+#define MTRR_TAG_MASK ((1 << MTRR_ALGO_SHIFT) - 1)
+
/* These are the region types */
#define MTRR_TYPE_UNCACHEABLE 0
#define MTRR_TYPE_WRCOMB 1
@@ -129,6 +145,11 @@ int var_mtrr_set(struct var_mtrr_context *ctx, uintptr_t addr, size_t size, int
void commit_mtrr_setup(const struct var_mtrr_context *ctx);
void postcar_mtrr_setup(void);
+static inline uint64_t calculate_var_mtrr_size(uint64_t mask)
+{
+ return 1 << (__ffs64(mask >> RANGE_SHIFT) + RANGE_SHIFT);
+}
+
#endif /* !defined(__ASSEMBLER__) */
/* Align up/down to next power of 2, suitable for assembler