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Add cpu detection for Sifive U74 #5914

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Merged
martin-frbg merged 1 commit into from
Jul 14, 2026
+18 −6
Merged

Add cpu detection for Sifive U74 #5914

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24 changes: 18 additions & 6 deletions cpuid_riscv64.c
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Original file line number Diff line number Diff line change
Expand Up @@ -98,9 +98,10 @@ static char *cpuname_lower[] = {
int detect(void){
#ifdef __linux
FILE *infile;
char buffer[512],isa_buffer[512],model_buffer[512];
char buffer[512],isa_buffer[512],model_buffer[512], uarch_buffer[512];
const char* check_c910_str = "T-HEAD C910";
char *pmodel = NULL, *pisa = NULL;
const char* check_u74_str = "sifive,u74";
char *pmodel = NULL, *pisa = NULL, *puarch = NULL;

infile = fopen("/proc/cpuinfo", "r");
if (!infile)
Expand All @@ -113,6 +114,13 @@ int detect(void){
pmodel++;
}

if(!strncmp(buffer, "uarch", 5)){
strcpy(uarch_buffer, buffer);
puarch = strchr(uarch_buffer, ':');
if (puarch)
puarch++;
}

if(!strncmp(buffer, "isa", 3)){
strcpy(isa_buffer, buffer);
pisa = strchr(isa_buffer, '4');
Expand All @@ -123,12 +131,16 @@ int detect(void){

fclose(infile);

if (!pmodel || !pisa)
if ((!pmodel && !puarch) || !pisa)
return(CPU_GENERIC);

if (strstr(pmodel, check_c910_str) && strchr(pisa, 'v'))
return CPU_C910V;

if (pmodel) {
if (strstr(pmodel, check_c910_str) && strchr(pisa, 'v'))
return CPU_C910V;
} else if (puarch) {
if (strstr(puarch, check_u74_str) && !strchr(pisa, 'v'))
return CPU_U74;
}
return CPU_GENERIC;
#endif

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