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cpu init: support for no_turbo kernel argument

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Balazs Gerofi
2015-06-25 12:18:27 +09:00
parent 41b85281a4
commit fbb776e4fb
1 changed files with 21 additions and 18 deletions
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39
arch/x86/kernel/cpu.c
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@@ -117,6 +117,7 @@ extern char page_fault[], general_protection_exception[];
extern char debug_exception[], int3_exception[]; extern char debug_exception[], int3_exception[];
uint64_t boot_pat_state = 0; uint64_t boot_pat_state = 0;
int no_turbo = 0; /* May be updated by early parsing of kargs */
static void init_idt(void) static void init_idt(void)
{ {
@@ -292,25 +293,27 @@ void init_pstate_and_turbo(void)
* When set to 1: disengages IDA * When set to 1: disengages IDA
* When set to 0: enables IDA * When set to 0: enables IDA
*/ */
if (eax & (1 << 1)) { if (!no_turbo) {
uint64_t turbo_value; if (eax & (1 << 1)) {
uint64_t turbo_value;
turbo_value = rdmsr(MSR_NHM_TURBO_RATIO_LIMIT);
turbo_value &= 0xFF; turbo_value = rdmsr(MSR_NHM_TURBO_RATIO_LIMIT);
if (turbo_value < value) { turbo_value &= 0xFF;
value = turbo_value; if (turbo_value < value) {
value = turbo_value;
}
value = value << 8;
/* Disable turbo boost */
//value |= (uint64_t)1 << 32;
/* Enable turbo boost */
value &= ~((uint64_t)1 << 32);
}
else {
value = value << 8;
} }
value = value << 8;
/* Disable turbo boost */
//value |= (uint64_t)1 << 32;
/* Enable turbo boost */
value &= ~((uint64_t)1 << 32);
}
else {
value = value << 8;
} }
wrmsr(MSR_IA32_PERF_CTL, value); wrmsr(MSR_IA32_PERF_CTL, value);