cpuid_loongarch64.c

/*****************************************************************************
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**********************************************************************************/

#include <stdint.h>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <sys/auxv.h>

#define CPU_LA64_GENERIC     0
#define CPU_LA264            1
#define CPU_LA364            2
#define CPU_LA464            3
#define CPU_LA664            4

#define CORE_LA64_GENERIC    0
#define CORE_LA264           1
#define CORE_LA464           2

#define LA_HWCAP_LSX    (1U << 4)
#define LA_HWCAP_LASX   (1U << 5)

#define LOONGARCH_CFG0      0x00
#define LOONGARCH_CFG2      0x02
#define LOONGARCH_CFG10     0x10
#define LOONGARCH_CFG11     0x11
#define LOONGARCH_CFG12     0x12
#define LOONGARCH_CFG13     0x13
#define LOONGARCH_CFG14     0x14
#define LASX_MASK           1<<7
#define LSX_MASK            1<<6
#define PRID_SERIES_MASK    0xf000
#define PRID_SERIES_LA264   0xa000
#define PRID_SERIES_LA364   0xb000
#define PRID_SERIES_LA464   0xc000
#define PRID_SERIES_LA664   0xd000

#define CACHE_INFO_L1_IU    0
#define CACHE_INFO_L1_D     1
#define CACHE_INFO_L2_IU    2
#define CACHE_INFO_L2_D     3
#define CACHE_INFO_L3_IU    4
#define CACHE_INFO_L3_D     5
#define L1_IU_PRESENT_MASK  0x0001
#define L1_IU_UNITY_MASK    0x0002
#define L1_D_PRESENT_MASK   0x0004
#define L2_IU_PRESENT_MASK  0x0008
#define L2_IU_UNITY_MASK    0x0010
#define L2_D_PRESENT_MASK   0x0080
#define L3_IU_PRESENT_MASK  0x0400
#define L3_IU_UNITY_MASK    0x0800
#define L3_D_PRESENT_MASK   0x4000
#define CACHE_WAY_MINUS_1_MASK      0x0000ffff
#define CACHE_INDEX_LOG2_MASK       0x00ff0000
#define CACHE_LINESIZE_LOG2_MASK    0x7f000000

typedef struct {
  int size;
  int associative;
  int linesize;
  int unify;
  int present;
} cache_info_t;

/* Using microarchitecture representation */
static char *cpuname[] = {
  "LA64_GENERIC",
  "LA264", /* Loongson 64bit, 2-issue, Like 2K1000LA */
  "LA364", /* Loongson 64bit, 3-issue, Like 2K2000 */
  "LA464", /* Loongson 64bit, 4-issue, Like 3A5000, 3C5000L, 3C5000 and 3D5000 */
  "LA664"  /* Loongson 64bit, 6-issue, Like 3A6000, 3C6000 and 3D6000 */
};

static char *cpuname_lower[] = {
  "la64_generic",
  "la264",
  "la364",
  "la464",
  "la664"
};

static char *corename[] = {
  "LA64_GENERIC", /* Implies using scalar instructions for optimization */
  "LA264", /* Implies using LSX  instructions for optimization */
  "LA464", /* Implies using LASX instructions for optimization */
};

static char *corename_lower[] = {
  "la64_generic",
  "la264",
  "la464",
};

/*
 * Obtain cache and processor identification
 * through the cpucfg command.
 */
static void get_cacheinfo(int type, cache_info_t *cacheinfo) {
  cache_info_t cache_info;
  memset(&cache_info, 0, sizeof(cache_info));
  uint32_t reg_10 = 0;
  __asm__ volatile (
    "cpucfg %0, %1 \n\t"
    : "+&r"(reg_10)
    : "r"(LOONGARCH_CFG10)
  );

  switch (type) {
    case CACHE_INFO_L1_IU:
      if (reg_10 & L1_IU_PRESENT_MASK) {
        uint32_t reg_11 = 0;
        cache_info.present = reg_10 & L1_IU_PRESENT_MASK;
        cache_info.unify   = reg_10 & L1_IU_UNITY_MASK;
        __asm__ volatile (
          "cpucfg %0, %1 \n\t"
          : "+&r"(reg_11)
          : "r"(LOONGARCH_CFG11)
        );
        cache_info.associative  = (reg_11 & CACHE_WAY_MINUS_1_MASK) + 1;
        cache_info.linesize = 1 << ((reg_11 & CACHE_LINESIZE_LOG2_MASK) >> 24);
        cache_info.size = cache_info.associative * cache_info.linesize *
                          (1 << ((reg_11 & CACHE_INDEX_LOG2_MASK) >> 16));
      }
    break;

    case CACHE_INFO_L1_D:
      if (reg_10 & L1_D_PRESENT_MASK) {
        uint32_t reg_12 = 0;
        cache_info.present = reg_10 & L1_D_PRESENT_MASK;
        __asm__ volatile (
          "cpucfg %0, %1 \n\t"
          : "+&r"(reg_12)
          : "r"(LOONGARCH_CFG12)
        );
        cache_info.associative  = (reg_12 & CACHE_WAY_MINUS_1_MASK) + 1;
        cache_info.linesize = 1 << ((reg_12 & CACHE_LINESIZE_LOG2_MASK) >> 24);
        cache_info.size = cache_info.associative * cache_info.linesize *
                          (1 << ((reg_12 & CACHE_INDEX_LOG2_MASK) >> 16));
      }
    break;

    case CACHE_INFO_L2_IU:
      if (reg_10 & L2_IU_PRESENT_MASK) {
        uint32_t reg_13 = 0;
        cache_info.present = reg_10 & L2_IU_PRESENT_MASK;
        cache_info.unify   = reg_10 & L2_IU_UNITY_MASK;
        __asm__ volatile (
          "cpucfg %0, %1 \n\t"
          : "+&r"(reg_13)
          : "r"(LOONGARCH_CFG13)
        );
        cache_info.associative  = (reg_13 & CACHE_WAY_MINUS_1_MASK) + 1;
        cache_info.linesize = 1 << ((reg_13 & CACHE_LINESIZE_LOG2_MASK) >> 24);
        cache_info.size = cache_info.associative * cache_info.linesize *
                          (1 << ((reg_13 & CACHE_INDEX_LOG2_MASK) >> 16));
      }
    break;

    case CACHE_INFO_L2_D:
      if (reg_10 & L2_D_PRESENT_MASK) {
        cache_info.present = reg_10 & L2_D_PRESENT_MASK;
        // No date fetch
      }
    break;

    case CACHE_INFO_L3_IU:
      if (reg_10 & L3_IU_PRESENT_MASK) {
        uint32_t reg_14 = 0;
        cache_info.present = reg_10 & L3_IU_PRESENT_MASK;
        cache_info.unify   = reg_10 & L3_IU_UNITY_MASK;
        __asm__ volatile (
          "cpucfg %0, %1 \n\t"
          : "+&r"(reg_14)
          : "r"(LOONGARCH_CFG14)
        );
        cache_info.associative  = (reg_14 & CACHE_WAY_MINUS_1_MASK) + 1;
        cache_info.linesize = 1 << ((reg_14 & CACHE_LINESIZE_LOG2_MASK) >> 24);
        cache_info.size = cache_info.associative * cache_info.linesize *
                          (1 << ((reg_14 & CACHE_INDEX_LOG2_MASK) >> 16));
      }
    break;

    case CACHE_INFO_L3_D:
      if (reg_10 & L3_D_PRESENT_MASK) {
        cache_info.present = reg_10 & L3_D_PRESENT_MASK;
        // No data fetch
      }
    break;

    default:
    break;
  }
  *cacheinfo = cache_info;
}

static uint32_t get_prid() {
  uint32_t reg = 0;
  __asm__ volatile (
    "cpucfg %0, %1 \n\t"
    : "+&r"(reg)
    : "r"(LOONGARCH_CFG0)
  );
  return reg;
}

static void get_cpucount(uint32_t *count) {
  uint32_t num = 0;
  FILE *f = fopen("/proc/cpuinfo", "r");
  if (!f) return;
  char buf[200];
  while (fgets(buf, sizeof(buf), f))
  {
    if (!strncmp("processor", buf, 9))
      num ++;
  }
  fclose(f);
  *count = num;
}

/* Detect whether the OS supports the LASX instruction set */
static int os_support_lasx() {
  int hwcap  = (int)getauxval(AT_HWCAP);

  if (hwcap & LA_HWCAP_LASX)
    return 1;
  else
    return 0;
}

/* Detect whether the OS supports the LSX instruction set */
static int os_support_lsx() {
  int hwcap  = (int)getauxval(AT_HWCAP);

  if (hwcap & LA_HWCAP_LSX)
    return 1;
  else
    return 0;
}

int get_coretype(void) {
  uint32_t prid = get_prid();
  switch (prid & PRID_SERIES_MASK) {
    case (PRID_SERIES_LA464):
    case (PRID_SERIES_LA664):
      if (os_support_lasx())
        return CORE_LA464;
      else if (os_support_lsx())
        return CORE_LA264;
      else
        return CORE_LA64_GENERIC;
    break;

    case (PRID_SERIES_LA264):
    case (PRID_SERIES_LA364):
      if (os_support_lsx())
        return CORE_LA264;
      else
        return CORE_LA64_GENERIC;
    break;

    default:
      return CORE_LA64_GENERIC;
    break;
  }
}

int get_cputype(void) {
  uint32_t prid = get_prid();
  switch (prid & PRID_SERIES_MASK) {
    case (PRID_SERIES_LA264):
      return CPU_LA264;
    break;

    case (PRID_SERIES_LA364):
      return CPU_LA364;
    break;

    case (PRID_SERIES_LA464):
      return CPU_LA464;
    break;

    case (PRID_SERIES_LA664):
      return CPU_LA664;
    break;

    default:
      return CPU_LA64_GENERIC;
    break;
  }
}

char *get_corename(void) {
  return corename[get_coretype()];
}

void get_libname(void){
  printf("%s", corename_lower[get_coretype()]);
}

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

void get_subarchitecture(void) {
  printf("%s", cpuname[get_cputype()]);
}

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

void get_cpuconfig(void) {
  cache_info_t info;
  uint32_t num_cores = 0;

  printf("#define %s\n", corename[get_coretype()]); // Core name

  printf("#define CPU_NAME %s\n", cpuname[get_cputype()]); // Cpu microarchitecture name

  get_cacheinfo(CACHE_INFO_L1_IU, &info);
  if (info.present) {
    if (info.unify) { // Unified cache, without distinguishing between instructions and data
      printf("#define L1_SIZE %d\n", info.size);
      printf("#define L1_ASSOCIATIVE %d\n", info.associative);
      printf("#define L1_LINESIZE %d\n", info.linesize);
    } else {
      printf("#define L1_CODE_SIZE %d\n", info.size);
      printf("#define L1_CODE_ASSOCIATIVE %d\n", info.associative);
      printf("#define L1_CODE_LINESIZE %d\n", info.linesize);
    }
  }

  if (!info.unify) {
    get_cacheinfo(CACHE_INFO_L1_D, &info);
    if (info.present) {
      printf("#define L1_DATA_SIZE %d\n", info.size);
      printf("#define L1_DATA_ASSOCIATIVE %d\n", info.associative);
      printf("#define L1_DATA_LINESIZE %d\n", info.linesize);
    }
  }

  get_cacheinfo(CACHE_INFO_L2_IU, &info);
  if (info.present > 0) {
    if (info.unify) {
      printf("#define L2_SIZE %d\n", info.size);
      printf("#define L2_ASSOCIATIVE %d\n", info.associative);
      printf("#define L2_LINESIZE %d\n", info.linesize);
    } else {
      printf("#define L2_CODE_SIZE %d\n", info.size);
      printf("#define L2_CODE_ASSOCIATIVE %d\n", info.associative);
      printf("#define L2_CODE_LINESIZE %d\n", info.linesize);
    }
  }

  get_cacheinfo(CACHE_INFO_L3_IU, &info);
  if (info.present > 0) {
    if (info.unify) {
      printf("#define L3_SIZE %d\n", info.size);
      printf("#define L3_ASSOCIATIVE %d\n", info.associative);
      printf("#define L3_LINESIZE %d\n", info.linesize);
    } else {
      printf("#define L3_CODE_SIZE %d\n", info.size);
      printf("#define L3_CODE_ASSOCIATIVE %d\n", info.associative);
      printf("#define L3_CODE_LINESIZE %d\n", info.linesize);
    }
  }

  if(os_support_lsx)  printf("#define HAVE_LSX\n");
  if(os_support_lasx) printf("#define HAVE_LASX\n");

  get_cpucount(&num_cores);
  if (num_cores)
    printf("#define NUM_CORES %d\n", num_cores);

  //TODO: It’s unclear what this entry represents, but it is indeed necessary.
  //It has been set based on reference to other platforms.
  printf("#define DTB_DEFAULT_ENTRIES 64\n");
}