/**************************************************************************
  Copyright (c) 2013, The OpenBLAS Project
  All rights reserved.
  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are
  met:
  1. Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.
  2. Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in
  the documentation and/or other materials provided with the
  distribution.
  3. Neither the name of the OpenBLAS project nor the names of
  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
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBLAS PROJECT OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *****************************************************************************/

#include <string.h>

#define CPU_UNKNOWN     	0
#define CPU_ARMV8       	1
// Arm
#define CPU_CORTEXA53     2
#define CPU_CORTEXA57     3
#define CPU_CORTEXA72     4
#define CPU_CORTEXA73     5
// Qualcomm
#define CPU_FALKOR        6
// Cavium
#define CPU_THUNDERX      7
#define CPU_THUNDERX2T99  8
//Hisilicon
#define CPU_TSV110        9

static char *cpuname[] = {
  "UNKNOWN",
  "ARMV8" ,
  "CORTEXA53",
  "CORTEXA57",
  "CORTEXA72",
  "CORTEXA73",
  "FALKOR",
  "THUNDERX",
  "THUNDERX2T99",
  "TSV110"
};

static char *cpuname_lower[] = {
  "unknown",
  "armv8",
  "cortexa53",
  "cortexa57",
  "cortexa72",
  "cortexa73",
  "falkor",
  "thunderx",
  "thunderx2t99",
  "tsv110"
};

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 0;

	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, *cpu_part = NULL, *cpu_implementer = NULL;
	p = (char *) NULL ;

	infile = fopen("/proc/cpuinfo", "r");
	while (fgets(buffer, sizeof(buffer), infile)) {
		if ((cpu_part != NULL) && (cpu_implementer != NULL)) {
			break;
		}

		if ((cpu_part == NULL) && !strncmp("CPU part", buffer, 8)) {
			cpu_part = strchr(buffer, ':') + 2;
			cpu_part = strdup(cpu_part);
		} else if ((cpu_implementer == NULL) && !strncmp("CPU implementer", buffer, 15)) {
			cpu_implementer = strchr(buffer, ':') + 2;
			cpu_implementer = strdup(cpu_implementer);
		}
	}

	fclose(infile);
	if(cpu_part != NULL && cpu_implementer != NULL) {
    // Arm
    if (strstr(cpu_implementer, "0x41")) {
      if (strstr(cpu_part, "0xd03"))
        return CPU_CORTEXA53;
      else if (strstr(cpu_part, "0xd07"))
        return CPU_CORTEXA57;
      else if (strstr(cpu_part, "0xd08"))
        return CPU_CORTEXA72;
      else if (strstr(cpu_part, "0xd09"))
        return CPU_CORTEXA73;
    }
    // Qualcomm
    else if (strstr(cpu_implementer, "0x51") && strstr(cpu_part, "0xc00"))
      return CPU_FALKOR;
    // Cavium
    else if (strstr(cpu_implementer, "0x43") && strstr(cpu_part, "0x0a1"))
			return CPU_THUNDERX;
    else if (strstr(cpu_implementer, "0x43") && strstr(cpu_part, "0x0af"))
			return CPU_THUNDERX2T99;
    // HiSilicon
    else if (strstr(cpu_implementer, "0x48") && strstr(cpu_part, "0xd01"))
                        return CPU_TSV110;
	}

	p = (char *) NULL ;
	infile = fopen("/proc/cpuinfo", "r");
	while (fgets(buffer, sizeof(buffer), infile))
	{

		if ((!strncmp("model name", buffer, 10)) || (!strncmp("Processor", buffer, 9)) ||
		    (!strncmp("CPU architecture", buffer, 16)))
		{
			p = strchr(buffer, ':') + 2;
			break;
      		}
  	}

  	fclose(infile);

  	if(p != NULL)
	{

		if ((strstr(p, "AArch64")) || (strstr(p, "8")))
		{
			return CPU_ARMV8;

		}


	}
#endif

	return CPU_UNKNOWN;
}

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

void get_architecture(void)
{
	printf("ARM64");
}

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

void get_subdirname(void)
{
	printf("arm64");
}

void get_cpucount(void)
{
int n=0;

#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("processor", buffer, 9))
		n++;
  	}

  	fclose(infile);

	printf("#define NUM_CORES %d\n",n);
#endif

}



void get_cpuconfig(void)
{

  // All arches should define ARMv8
  printf("#define ARMV8\n");
  printf("#define HAVE_NEON\n"); // This shouldn't be necessary
  printf("#define HAVE_VFPV4\n"); // This shouldn't be necessary

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

    case CPU_CORTEXA53:
      printf("#define %s\n", cpuname[d]);
      // Fall-through
		case CPU_ARMV8:
      // Minimum parameters for ARMv8 (based on A53)
    	printf("#define L1_DATA_SIZE 32768\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 4\n");
			break;

		case CPU_CORTEXA57:
		case CPU_CORTEXA72:
		case CPU_CORTEXA73:
      // Common minimum settings for these Arm cores
      // Can change a lot, but we need to be conservative
      // TODO: detect info from /sys if possible
      printf("#define %s\n", cpuname[d]);
			printf("#define L1_CODE_SIZE 49152\n");
			printf("#define L1_CODE_LINESIZE 64\n");
			printf("#define L1_CODE_ASSOCIATIVE 3\n");
			printf("#define L1_DATA_SIZE 32768\n");
			printf("#define L1_DATA_LINESIZE 64\n");
			printf("#define L1_DATA_ASSOCIATIVE 2\n");
      printf("#define L2_SIZE 524288\n");
			printf("#define L2_LINESIZE 64\n");
			printf("#define L2_ASSOCIATIVE 16\n");
			printf("#define DTB_DEFAULT_ENTRIES 64\n");
			printf("#define DTB_SIZE 4096\n");
			break;

    case CPU_FALKOR:
      printf("#define FALKOR\n");
      printf("#define L1_CODE_SIZE 65536\n");
      printf("#define L1_CODE_LINESIZE 64\n");
      printf("#define L1_DATA_SIZE 32768\n");
      printf("#define L1_DATA_LINESIZE 128\n");
      printf("#define L2_SIZE 524288\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_THUNDERX:
			printf("#define THUNDERX\n");
			printf("#define L1_DATA_SIZE 32768\n");
			printf("#define L1_DATA_LINESIZE 128\n");
			printf("#define L2_SIZE 16777216\n");
			printf("#define L2_LINESIZE 128\n");
			printf("#define DTB_DEFAULT_ENTRIES 64\n");
			printf("#define DTB_SIZE 4096\n");
			printf("#define L2_ASSOCIATIVE 16\n");
			break;

		case CPU_THUNDERX2T99:
			printf("#define THUNDERX2T99                  \n");
			printf("#define L1_CODE_SIZE         32768    \n");
			printf("#define L1_CODE_LINESIZE     64       \n");
			printf("#define L1_CODE_ASSOCIATIVE  8        \n");
			printf("#define L1_DATA_SIZE         32768    \n");
			printf("#define L1_DATA_LINESIZE     64       \n");
			printf("#define L1_DATA_ASSOCIATIVE  8        \n");
			printf("#define L2_SIZE              262144   \n");
			printf("#define L2_LINESIZE          64       \n");
			printf("#define L2_ASSOCIATIVE       8        \n");
			printf("#define L3_SIZE              33554432 \n");
			printf("#define L3_LINESIZE          64       \n");
			printf("#define L3_ASSOCIATIVE       32       \n");
			printf("#define DTB_DEFAULT_ENTRIES  64       \n");
			printf("#define DTB_SIZE             4096     \n");
			break;
			
		case CPU_TSV110:
			printf("#define TSV110                        \n");
			printf("#define L1_CODE_SIZE         65536    \n");
			printf("#define L1_CODE_LINESIZE     64       \n");
			printf("#define L1_CODE_ASSOCIATIVE  4        \n");
			printf("#define L1_DATA_SIZE         65536    \n");
			printf("#define L1_DATA_LINESIZE     64       \n");
			printf("#define L1_DATA_ASSOCIATIVE  4        \n");
			printf("#define L2_SIZE              524228   \n");
			printf("#define L2_LINESIZE          64       \n");
			printf("#define L2_ASSOCIATIVE       8        \n");
			printf("#define DTB_DEFAULT_ENTRIES  64       \n");
			printf("#define DTB_SIZE             4096     \n");
			break;	
	}
	get_cpucount();
}


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

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," ")))
	{
	}

#endif
	return;
}
