1 /* -*- linux-c -*- ------------------------------------------------------- * 2 * 3 * Copyright (C) 1991, 1992 Linus Torvalds 4 * Copyright 2007 rPath, Inc. - All Rights Reserved 5 * 6 * This file is part of the Linux kernel, and is made available under 7 * the terms of the GNU General Public License version 2. 8 * 9 * ----------------------------------------------------------------------- */ 10 11 /* 12 * arch/i386/boot/cpu.c 13 * 14 * Check for obligatory CPU features and abort if the features are not 15 * present. 16 */ 17 18 #include "boot.h" 19 #include "bitops.h" 20 #include <asm/cpufeature.h> 21 22 static char *cpu_name(int level) 23 { 24 static char buf[6]; 25 26 if (level == 64) { 27 return "x86-64"; 28 } else { 29 sprintf(buf, "i%d86", level); 30 return buf; 31 } 32 } 33 34 int validate_cpu(void) 35 { 36 u32 *err_flags; 37 int cpu_level, req_level; 38 39 check_cpu(&cpu_level, &req_level, &err_flags); 40 41 if (cpu_level < req_level) { 42 printf("This kernel requires an %s CPU, ", 43 cpu_name(req_level)); 44 printf("but only detected an %s CPU.\n", 45 cpu_name(cpu_level)); 46 return -1; 47 } 48 49 if (err_flags) { 50 int i, j; 51 puts("This kernel requires the following features " 52 "not present on the CPU:\n"); 53 54 for (i = 0; i < NCAPINTS; i++) { 55 u32 e = err_flags[i]; 56 57 for (j = 0; j < 32; j++) { 58 if (e & 1) 59 printf("%d:%d ", i, j); 60 61 e >>= 1; 62 } 63 } 64 putchar('\n'); 65 return -1; 66 } else { 67 return 0; 68 } 69 } 70