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x86: Add functions to convert between mtrr size and mask

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Rather than repeating the same code in several places, add some
functions which can do the conversion.

Use the cpu_phys_address_size() function to obtain the physical-address
size, since it is more reliable with kvm, where the host CPU may have a
different value from the emulation CPU.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2025-03-06 09:03:49 -07:00
parent 5ef7e0a18b
commit 70001544fe
3 changed files with 43 additions and 11 deletions
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5
cmd/x86/mtrr.c
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@@ -14,7 +14,7 @@ static int do_mtrr_set(int cpu_select, uint reg, int argc, char *const argv[])
{
const char *typename = argv[0];
uint32_t start, size;
uint64_t base, mask;
u64 base, mask;
int type = -1;
bool valid;
int ret;
@@ -31,8 +31,7 @@ static int do_mtrr_set(int cpu_select, uint reg, int argc, char *const argv[])
base = start | type;
valid = native_read_msr(MTRR_PHYS_MASK_MSR(reg)) & MTRR_PHYS_MASK_VALID;
mask = ~((uint64_t)size - 1);
mask &= (1ULL << CONFIG_CPU_ADDR_BITS) - 1;
mask = mtrr_to_mask(size);
if (valid)
mask |= MTRR_PHYS_MASK_VALID;