cpuid_loongarch64.c

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#include <stdint.h>

/*  If LASX extension instructions supported,
 *  using core LOONGSON3R5
 *  If only LSX extension instructions supported,
 *  using core LOONGSON2K1000
 *  If neither LASX nor LSX extension instructions supported,
 *  using core LOONGSONGENERIC (As far as I know, there is no such
 *  CPU yet)
 */

#define CPU_GENERIC        0
#define CPU_LOONGSON3R5    1
#define CPU_LOONGSON2K1000 2

#define LOONGARCH_CFG2  0x02
#define LOONGARCH_LASX  1<<7
#define LOONGARCH_LSX   1<<6

static char *cpuname[] = {
  "LOONGSONGENERIC",
  "LOONGSON3R5",
  "LOONGSON2K1000"
};

static char *cpuname_lower[] = {
  "loongsongeneric",
  "loongson3r5",
  "loongson2k1000"
};

int detect(void) {
#ifdef __linux
  uint32_t reg = 0;

  __asm__ volatile (
    "cpucfg %0, %1 \n\t"
    : "+&r"(reg)
    : "r"(LOONGARCH_CFG2)
  );

  if (reg & LOONGARCH_LASX)
    return CPU_LOONGSON3R5;
  else if (reg & LOONGARCH_LSX)
    return CPU_LOONGSON2K1000;
  else
    return CPU_GENERIC;
#endif
  return CPU_GENERIC;
}

char *get_corename(void) {
  return cpuname[detect()];
}

void get_architecture(void) {
  printf("LOONGARCH64");
}

void get_subarchitecture(void) {
  int d = detect();
  printf("%s", cpuname[d]);
}

void get_subdirname(void) {
  printf("loongarch64");
}

void get_cpuconfig(void) {
  int d = detect();
  switch (d) {
    case CPU_LOONGSON3R5:
      printf("#define LOONGSON3R5\n");
      printf("#define L1_DATA_SIZE 65536\n");
      printf("#define L1_DATA_LINESIZE 64\n");
      printf("#define L2_SIZE 1048576\n");
      printf("#define L2_LINESIZE 64\n");
      printf("#define DTB_DEFAULT_ENTRIES 64\n");
      printf("#define DTB_SIZE 4096\n");
      printf("#define L2_ASSOCIATIVE 16\n");
    break;

    case CPU_LOONGSON2K1000:
      printf("#define LOONGSON2K1000\n");
      printf("#define L1_DATA_SIZE 65536\n");
      printf("#define L1_DATA_LINESIZE 64\n");
      printf("#define L2_SIZE 262144\n");
      printf("#define L2_LINESIZE 64\n");
      printf("#define DTB_DEFAULT_ENTRIES 64\n");
      printf("#define DTB_SIZE 4096\n");
      printf("#define L2_ASSOCIATIVE 16\n");
    break;

    default:
      printf("#define LOONGSONGENERIC\n");
      printf("#define L1_DATA_SIZE 65536\n");
      printf("#define L1_DATA_LINESIZE 64\n");
      printf("#define L2_SIZE 262144\n");
      printf("#define L2_LINESIZE 64\n");
      printf("#define DTB_DEFAULT_ENTRIES 64\n");
      printf("#define DTB_SIZE 4096\n");
      printf("#define L2_ASSOCIATIVE 16\n");
    break;
  }
}

void get_libname(void){
  int d = detect();
  printf("%s", cpuname_lower[d]);
}