OpenBLAS/driver/others/dynamic_mips64.c

/*****************************************************************************
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#include <sys/wait.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/resource.h>
#include "common.h"

#if (defined OS_LINUX || defined OS_ANDROID)
#include <asm/hwcap.h>
#include <sys/auxv.h>

#ifndef HWCAP_LOONGSON_CPUCFG
#define HWCAP_LOONGSON_CPUCFG (1 << 14)
#endif
#endif

extern gotoblas_t  gotoblas_LOONGSON3R3;
extern gotoblas_t  gotoblas_LOONGSON3R4;
extern gotoblas_t  gotoblas_MIPS64_GENERIC;

extern void openblas_warning(int verbose, const char * msg);

#define NUM_CORETYPES    3

static char *corename[] = {
  "MIPS64_GENERIC"
  "loongson3r3",
  "loongson3r4",
  "UNKNOWN"
};

char *gotoblas_corename(void) {
  if (gotoblas == &gotoblas_MIPS64_GENERIC) return corename[0];
  if (gotoblas == &gotoblas_LOONGSON3R3)    return corename[1];
  if (gotoblas == &gotoblas_LOONGSON3R4)    return corename[2];
  return corename[NUM_CORETYPES];
}

static gotoblas_t *force_coretype(char *coretype) {
  int i;
  int found = -1;
  char message[128];

  for ( i=0 ; i < NUM_CORETYPES; i++)
  {
    if (!strncasecmp(coretype, corename[i], 20))
    {
        found = i;
        break;
    }
  }

  switch (found)
  {
    case  0: return (&gotoblas_MIPS64_GENERIC);
    case  1: return (&gotoblas_LOONGSON3R3);
    case  2: return (&gotoblas_LOONGSON3R4);
  }
  snprintf(message, 128, "Core not found: %s\n", coretype);
  openblas_warning(1, message);
  return NULL;
}

#if (defined OS_LINUX || defined OS_ANDROID)
#define MMI_MASK    0x00000010
#define MSA_MASK    0x00000020

static gotoblas_t *get_coretype_from_cpucfg(void) {
    int flag = 0;
    __asm__ volatile(
        ".set push                 \n\t"
        ".set noat                 \n\t"
        ".insn                     \n\t"
        "dli    $1,    0x01        \n\t"
        ".word (0xc8080118)        \n\t"
        "move   %0,    $1          \n\t"
        ".set pop                  \n\t"
        : "=r"(flag)
        :
        :
    );
    if (flag & MSA_MASK)
        return (&gotoblas_LOONGSON3R4);
    if (flag & MMI_MASK)
        return (&gotoblas_LOONGSON3R3);
    return NULL;
}

static gotoblas_t *get_coretype_from_cpuinfo(void) {
#ifdef __linux
  FILE *infile;
  char buffer[512], *p;

  p = (char *)NULL;
  //Check model name for Loongson3
  infile = fopen("/proc/cpuinfo", "r");
  while (fgets(buffer, sizeof(buffer), infile)){
    if (!strncmp("model name", buffer, 10)){
      p = strchr(buffer, ':') + 2;
      break;
    }
  }
  fclose(infile);
  if(p != NULL){
   if (strstr(p, "Loongson-3A3000") || strstr(p, "Loongson-3B3000"))
     return (&gotoblas_LOONGSON3R3);
   else if(strstr(p, "Loongson-3A4000") || strstr(p, "Loongson-3B4000"))
     return (&gotoblas_LOONGSON3R4);
   else
     return NULL;
  }
#endif
  return NULL;
}
#endif

static gotoblas_t *get_coretype(void) {
#if (!defined OS_LINUX && !defined OS_ANDROID)
  return NULL;
#else
  if (!(getauxval(AT_HWCAP) & HWCAP_LOONGSON_CPUCFG))
    return get_coretype_from_cpucfg();
  else
    return get_coretype_from_cpuinfo();
#endif
}

void gotoblas_dynamic_init(void) {
  char coremsg[128];
  char coren[22];
  char *p;

  if (gotoblas) return;

  p = getenv("OPENBLAS_CORETYPE");
  if ( p )
  {
    gotoblas = force_coretype(p);
  }
  else
  {
    gotoblas = get_coretype();
  }

  if (gotoblas == NULL)
  {
    snprintf(coremsg, 128, "Falling back to MIPS64_GENEIRC\n");
    openblas_warning(1, coremsg);
    gotoblas = &gotoblas_MIPS64_GENERIC;
  }

  if (gotoblas && gotoblas->init) {
    strncpy(coren, gotoblas_corename(), 20);
    sprintf(coremsg, "Core: %s\n", coren);
    openblas_warning(2, coremsg);
    gotoblas -> init();
  } else {
    openblas_warning(0, "OpenBLAS : Architecture Initialization failed. No initialization function found.\n");
    exit(1);
  }

}

void gotoblas_dynamic_quit(void) {
  gotoblas = NULL;
}