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helper functions

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This commit is contained in:
Andreas Abel
2022-01-14 20:51:50 +01:00
parent c44e017398
commit a148f95497
2 changed files with 41 additions and 0 deletions
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33
common/nanoBench.c
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@@ -329,6 +329,27 @@ void write_msr(unsigned int msr, uint64_t value) {
#endif
}
void change_bit_in_msr(unsigned int msr, unsigned int bit, bool bit_value) {
uint64_t msr_value = read_msr(msr);
msr_value &= ~((uint64_t)1 << bit);
msr_value |= ((uint64_t)bit_value << bit);
write_msr(msr, msr_value);
}
void set_bit_in_msr(unsigned int msr, unsigned int bit) {
change_bit_in_msr(msr, bit, true);
}
void clear_bit_in_msr(unsigned int msr, unsigned int bit) {
change_bit_in_msr(msr, bit, false);
}
uint64_t read_pmc(unsigned int counter) {
unsigned long lo, hi;
asm volatile("rdpmc" : "=a"(lo), "=d"(hi) : "c"(counter));
return lo | ((uint64_t)hi) << 32;
}
void clear_perf_counters() {
if (is_Intel_CPU) {
for (int i=0; i<3; i++) {
@@ -375,6 +396,18 @@ void disable_perf_ctrs_globally() {
}
}
void enable_freeze_on_PMI(void) {
if (is_Intel_CPU) {
set_bit_in_msr(MSR_IA32_DEBUGCTL, 12);
}
}
void disable_freeze_on_PMI(void) {
if (is_Intel_CPU) {
clear_bit_in_msr(MSR_IA32_DEBUGCTL, 12);
}
}
void configure_perf_ctrs_FF_Intel(bool usr, bool os) {
uint64_t fixed_ctrl = 0;
fixed_ctrl |= (os << 8) | (os << 4) | os;

8
common/nanoBench.h
View File

@@ -232,6 +232,11 @@ uint64_t read_value_from_cmd(char* cmd);
uint64_t read_msr(unsigned int msr);
void write_msr(unsigned int msr, uint64_t value);
void change_bit_in_msr(unsigned int msr, unsigned int bit, bool bit_value);
void set_bit_in_msr(unsigned int msr, unsigned int bit);
void clear_bit_in_msr(unsigned int msr, unsigned int bit);
uint64_t read_pmc(unsigned int counter);
void clear_perf_counters(void);
void clear_perf_counter_configurations(void);
@@ -240,6 +245,9 @@ void clear_overflow_status_bits(void);
void enable_perf_ctrs_globally(void);
void disable_perf_ctrs_globally(void);
void enable_freeze_on_PMI(void);
void disable_freeze_on_PMI(void);
// Enables the fixed-function performance counters locally.
void configure_perf_ctrs_FF_Intel(bool usr, bool os);