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cpu.c

/* -*- linux-c -*- ------------------------------------------------------- *
 *
 *   Copyright (C) 1991, 1992 Linus Torvalds
 *   Copyright 2007 rPath, Inc. - All Rights Reserved
 *
 *   This file is part of the Linux kernel, and is made available under
 *   the terms of the GNU General Public License version 2.
 *
 * ----------------------------------------------------------------------- */

/*
 * arch/i386/boot/cpu.c
 *
 * Check for obligatory CPU features and abort if the features are not
 * present.
 */

#include "boot.h"
#include "bitops.h"
#include <asm/cpufeature.h>

static char *cpu_name(int level)
{
      static char buf[6];

      if (level == 64) {
            return "x86-64";
      } else {
            sprintf(buf, "i%d86", level);
            return buf;
      }
}

int validate_cpu(void)
{
      u32 *err_flags;
      int cpu_level, req_level;

      check_cpu(&cpu_level, &req_level, &err_flags);

      if (cpu_level < req_level) {
            printf("This kernel requires an %s CPU, ",
                   cpu_name(req_level));
            printf("but only detected an %s CPU.\n",
                   cpu_name(cpu_level));
            return -1;
      }

      if (err_flags) {
            int i, j;
            puts("This kernel requires the following features "
                 "not present on the CPU:\n");

            for (i = 0; i < NCAPINTS; i++) {
                  u32 e = err_flags[i];

                  for (j = 0; j < 32; j++) {
                        if (e & 1)
                              printf("%d:%d ", i, j);

                        e >>= 1;
                  }
            }
            putchar('\n');
            return -1;
      } else {
            return 0;
      }
}

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