cpuid_arm.c

/**************************************************************************
  Copyright (c) 2013, The OpenBLAS Project
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  distribution.
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  its contributors may be used to endorse or promote products
  derived from this software without specific prior written permission.
  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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#include <string.h>

#define CPU_UNKNOWN     	0
#define CPU_ARMV6       	1
#define CPU_ARMV7       	2
#define CPU_CORTEXA15       	3

static char *cpuname[] = {
  "UNKOWN",
  "ARMV6",
  "ARMV7",
  "CORTEXA15"
};


int get_feature(char *search)
{

#ifdef linux
	FILE *infile;
  	char buffer[2048], *p,*t;
  	p = (char *) NULL ;

  	infile = fopen("/proc/cpuinfo", "r");

	while (fgets(buffer, sizeof(buffer), infile))
	{

		if (!strncmp("Features", buffer, 8))
		{
			p = strchr(buffer, ':') + 2;
			break;
      		}
  	}

  	fclose(infile);


	if( p == NULL ) return;

	t = strtok(p," ");
	while( t = strtok(NULL," "))
	{	
		if (!strcmp(t, search))   { return(1); }
	}

#endif
	return(0);
}


int detect(void)
{

#ifdef linux

	FILE *infile;
  	char buffer[512], *p;
  	p = (char *) NULL ;

  	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, "ARMv7")) 
		{
			 if ( get_feature("vfpv4"))
			 	return CPU_ARMV7;

			 if ( get_feature("vfpv3"))
			 	return CPU_ARMV7;

			 if ( get_feature("vfp"))
			 	return CPU_ARMV6;


		}

		if (strstr(p, "ARMv6")) 
		{
			 if ( get_feature("vfp"))
			 	return CPU_ARMV6;
		}


	}
#endif

	return CPU_UNKNOWN;
}

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

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

void get_subarchitecture(void)
{
	int d = detect();
	switch (d)
	{

		case CPU_ARMV7:
			printf("ARMV7");
			break;

		case CPU_ARMV6:
			printf("ARMV6");
			break;

		default:
			printf("UNKNOWN");
			break;
	}
}

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

void get_cpuconfig(void)
{

	int d = detect();
	switch (d)
	{

		case CPU_ARMV7:
    			printf("#define ARMV7\n");
    			printf("#define HAVE_VFP\n");
    			printf("#define HAVE_VFPV3\n");
			if ( get_feature("neon"))	printf("#define HAVE_NEON\n");
			if ( get_feature("vfpv4"))	printf("#define HAVE_VFPV4\n");
    			printf("#define L1_DATA_SIZE 65536\n");
    			printf("#define L1_DATA_LINESIZE 32\n");
    			printf("#define L2_SIZE 512488\n");
    			printf("#define L2_LINESIZE 32\n");
    			printf("#define DTB_DEFAULT_ENTRIES 64\n");
    			printf("#define DTB_SIZE 4096\n");
    			printf("#define L2_ASSOCIATIVE 4\n");
			break;

		case CPU_ARMV6:
    			printf("#define ARMV6\n");
    			printf("#define HAVE_VFP\n");
    			printf("#define L1_DATA_SIZE 65536\n");
    			printf("#define L1_DATA_LINESIZE 32\n");
    			printf("#define L2_SIZE 512488\n");
    			printf("#define L2_LINESIZE 32\n");
    			printf("#define DTB_DEFAULT_ENTRIES 64\n");
    			printf("#define DTB_SIZE 4096\n");
    			printf("#define L2_ASSOCIATIVE 4\n");
			break;

	}
}


void get_libname(void)
{

	int d = detect();
	switch (d)
	{

		case CPU_ARMV7:
    			printf("armv7\n");
			break;

		case CPU_ARMV6:
    			printf("armv6\n");
			break;

	}
}


void get_features(void)
{

#ifdef linux
	FILE *infile;
  	char buffer[2048], *p,*t;
  	p = (char *) NULL ;

  	infile = fopen("/proc/cpuinfo", "r");

	while (fgets(buffer, sizeof(buffer), infile))
	{

		if (!strncmp("Features", buffer, 8))
		{
			p = strchr(buffer, ':') + 2;
			break;
      		}
  	}

  	fclose(infile);


	if( p == NULL ) return;

	t = strtok(p," ");
	while( t = strtok(NULL," "))
	{	
		if (!strcmp(t, "vfp"))   { printf("HAVE_VFP=1\n"); continue; }
		if (!strcmp(t, "vfpv3")) { printf("HAVE_VFPV3=1\n"); continue; }
		if (!strcmp(t, "vfpv4")) { printf("HAVE_VFPV4=1\n"); continue; }
		if (!strcmp(t, "neon"))  { printf("HAVE_NEON=1\n"); continue; }
	}

#endif
	return;
}