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RDMSR: fix bus speed computing with AMD CPUs

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This commit is contained in:
Xorg 2017-02-12 21:51:04 +01:00
parent 09a75e95f2
commit eac52e7f04
1 changed files with 6 additions and 1 deletions
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7
libcpuid/rdmsr.c
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@ -858,6 +858,7 @@ static double get_info_voltage(struct msr_info_t *info)
static double get_info_bus_clock(struct msr_info_t *info)
{
int err;
uint32_t addr = MSR_PSTATE_7 + 1;
uint64_t reg;
if(info->id->vendor == VENDOR_INTEL) {
@ -877,8 +878,12 @@ static double get_info_bus_clock(struct msr_info_t *info)
/* Refer links above
MSRC001_0061[6:4] is PstateMaxVal
PstateMaxVal is the the lowest-performance non-boosted P-state */
do {
addr--;
cpu_rdmsr_range(info->handle, addr, 8, 0, &reg);
} while((reg == 0x0) && (addr > MSR_PSTATE_0));
err = cpu_rdmsr_range(info->handle, MSR_PSTATE_L, 6, 4, &reg);
err += get_amd_multipliers(info, MSR_PSTATE_0 + (uint32_t) reg, &reg);
err += get_amd_multipliers(info, MSR_PSTATE_0 + (addr - MSR_PSTATE_0 - (uint32_t) reg), &reg);
if (!err) return (double) info->cpu_clock / reg;
}