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/* Subroutines for the gcc driver.

   Copyright (C) 2008, 2011 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 3, or (at your option)

any later version.

GCC is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU General Public License for more details.

You should have received a copy of the GNU General Public License

along with GCC; see the file COPYING3.  If not see

<http://www.gnu.org/licenses/>.  */

#include "config.h"

#include "system.h"

#include "coretypes.h"

#include "tm.h"

#ifdef __sgi__

#include <invent.h>

#include <sys/sbd.h>

/* Cf. MIPS R10000 Microprocessor User Guide, Version 2.0, 14.13 Processor

   Revision Identifier (PRId) Register (15).

   http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi/hdwr/bks/SGI_Developer/books/R10K_UM/sgi_html/t5.Ver.2.0.book_279.html  */

static const struct cpu_types {

  int impl;

  const char *cpu;

} cpu_types[] = {

  { C0_IMP_R2000, "r2000" },

  { C0_IMP_R3000, "r3000" },

  { C0_IMP_R6000, "r6000" },

  { C0_IMP_R4000, "r4000" },

  { C0_IMP_R6000A, "r6000" },

  { C0_IMP_R10000, "r10000" },

  { C0_IMP_R12000, "r12000" },

  { C0_IMP_R14000, "r14000" },

  { C0_IMP_R8000,  "r8000" },

  { C0_IMP_R4600,  "r4600" },

  { C0_IMP_R4700,  "r4600" },

  { C0_IMP_R4650,  "r4650" },

  { C0_IMP_R5000,  "vr5000" },

  { C0_IMP_RM7000, "rm7000" },

  { C0_IMP_RM5271, "vr5000" },

  { 0, 0 }

};

static int

cputype (inventory_t *inv, void *arg)

{

  if (inv != NULL

      && inv->inv_class == INV_PROCESSOR

      && inv->inv_type == INV_CPUCHIP)

    {

      int i;

      /* inv_state is the cpu revision number.  */

      int impl = (inv->inv_state & C0_IMPMASK) >> C0_IMPSHIFT;

      for (i = 0; cpu_types[i].cpu != NULL; i++)

        if (cpu_types[i].impl == impl)

          {

            *((const char **) arg) = cpu_types[i].cpu;

            break;

          }

    }

  return 0;

}

#endif

/* This will be called by the spec parser in gcc.c when it sees

   a %:local_cpu_detect(args) construct.  Currently it will be called

   with either "arch" or "tune" as argument depending on if -march=native

   or -mtune=native is to be substituted.

   It returns a string containing new command line parameters to be

   put at the place of the above two options, depending on what CPU

   this is executed.  E.g. "-march=loongson2f" on a Loongson 2F for

   -march=native.  If the routine can't detect a known processor,

   the -march or -mtune option is discarded.

   ARGC and ARGV are set depending on the actual arguments given

   in the spec.  */

const char *

host_detect_local_cpu (int argc, const char **argv)

{

  const char *cpu = NULL;

#ifndef __sgi__

  char buf[128];

  FILE *f;

#endif

  bool arch;

  if (argc < 1)

    return NULL;

  arch = strcmp (argv[0], "arch") == 0;

  if (!arch && strcmp (argv[0], "tune"))

    return NULL;

#ifdef __sgi__

  scaninvent (cputype, &cpu);

#else

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

  if (f == NULL)

    return NULL;

  while (fgets (buf, sizeof (buf), f) != NULL)

    if (strncmp (buf, "cpu model", sizeof ("cpu model") - 1) == 0)

      {

        if (strstr (buf, "Godson2 V0.2") != NULL

            || strstr (buf, "Loongson-2 V0.2") != NULL)

          cpu = "loongson2e";

        else if (strstr (buf, "Godson2 V0.3") != NULL

                 || strstr (buf, "Loongson-2 V0.3") != NULL)

          cpu = "loongson2f";

        else if (strstr (buf, "SiByte SB1") != NULL)

          cpu = "sb1";

        else if (strstr (buf, "R5000") != NULL)

          cpu = "r5000";

        else if (strstr (buf, "Octeon II") != NULL)

          cpu = "octeon2";

        else if (strstr (buf, "Octeon") != NULL)

          cpu = "octeon";

        break;

      }

  fclose (f);

#endif

  if (cpu == NULL)

    return NULL;

  return concat ("-m", argv[0], "=", cpu, NULL);

}