File: Architecture-mips-shared.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sts=4 et sw=4 tw=99:
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "jit/mips-shared/Architecture-mips-shared.h"

#include <fcntl.h>
#include <unistd.h>

#include "jit/RegisterSets.h"

#define HWCAP_MIPS (1 << 28)
#define HWCAP_LOONGSON (1 << 27)
#define HWCAP_R2 (1 << 26)
#define HWCAP_FPU (1 << 0)

namespace js {
namespace jit {

static uint32_t get_mips_flags() {
  uint32_t flags = HWCAP_MIPS;

#if defined(JS_SIMULATOR_MIPS32) || defined(JS_SIMULATOR_MIPS64)
  flags |= HWCAP_FPU;
  flags |= HWCAP_R2;
#else
#ifdef __linux__
  FILE* fp = fopen("/proc/cpuinfo", "r");
  if (!fp) return flags;

  char buf[1024];
  memset(buf, 0, sizeof(buf));
  (void)fread(buf, sizeof(char), sizeof(buf) - 1, fp);
  fclose(fp);
  if (strstr(buf, "FPU")) flags |= HWCAP_FPU;
  if (strstr(buf, "Loongson")) flags |= HWCAP_LOONGSON;
  if (strstr(buf, "mips32r2") || strstr(buf, "mips64r2")) flags |= HWCAP_R2;
#endif
#endif  // JS_SIMULATOR_MIPS32 || JS_SIMULATOR_MIPS64
  return flags;
}

static bool check_fpu() { return mips_private::Flags & HWCAP_FPU; }

static bool check_loongson() { return mips_private::Flags & HWCAP_LOONGSON; }

static bool check_r2() { return mips_private::Flags & HWCAP_R2; }

namespace mips_private {
// Cache a local copy so we only have to read /proc/cpuinfo once.
uint32_t Flags = get_mips_flags();
bool hasFPU = check_fpu();
;
bool isLoongson = check_loongson();
bool hasR2 = check_r2();
}  // namespace mips_private

Registers::Code Registers::FromName(const char* name) {
  for (size_t i = 0; i < Total; i++) {
    if (strcmp(GetName(i), name) == 0) return Code(i);
  }

  return Invalid;
}

}  // namespace jit
}  // namespace js