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[SYSINFO] Fixed readFreq for LoongArch64 #3906

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Merged
ptitSeb merged 1 commit into from
May 29, 2026
+34 −3
Merged

[SYSINFO] Fixed readFreq for LoongArch64 #3906

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37 changes: 34 additions & 3 deletions src/os/freq_linux.c
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Original file line number Diff line number Diff line change
Expand Up @@ -69,20 +69,51 @@ static inline uint64_t readFreq()
return val;
}
#elif defined(LA64)
#define LA64_CPUCFG2 0x2
#define LA64_CPUCFG2_LLFTP (1u << 14)
#define LA64_CPUCFG4 0x4
#define LA64_CPUCFG5 0x5

static inline uint64_t readCycleCounter()
{
uint64_t val;
uint64_t id;
asm volatile("rdtime.d %0, %1"
: "=r"(val) : "r"(0));
: "=r"(val), "=r"(id));
(void)id;
return val;
}

static inline uint64_t readFreq()
{
static size_t val = -1;
static uint64_t val = 0;

if (box64_sysinfo.read_frequency) return box64_sysinfo.frequency;
if (val) return val;

uint32_t idx = LA64_CPUCFG2;
uint32_t res;
asm volatile("cpucfg %0, %1"
: "=r"(res)
: "r"(idx));
if (res & LA64_CPUCFG2_LLFTP) {
idx = LA64_CPUCFG4;
uint32_t base_freq;
asm volatile("cpucfg %0, %1"
: "=r"(base_freq)
: "r"(idx));
idx = LA64_CPUCFG5;
asm volatile("cpucfg %0, %1"
: "=r"(res)
: "r"(idx));
uint32_t cfm = res & 0xffff;
uint32_t cfd = (res >> 16) & 0xffff;
if (base_freq && cfm && cfd) {
val = (uint64_t)base_freq * cfm / cfd;
return val;
}
}

// fallback to rdtime + sleep
struct timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = 50000000; // 50 milliseconds
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