1 /* -*- linux-c -*- ------------------------------------------------------- * 2 * 3 * Copyright (C) 1991, 1992 Linus Torvalds 4 * Copyright 2007-2008 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/x86/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 "cpustr.h" 20 21 static char *cpu_name(int level) 22 { 23 static char buf[6]; 24 25 if (level == 64) { 26 return "x86-64"; 27 } else { 28 if (level == 15) 29 level = 6; 30 sprintf(buf, "i%d86", level); 31 return buf; 32 } 33 } 34 35 int validate_cpu(void) 36 { 37 u32 *err_flags; 38 int cpu_level, req_level; 39 const unsigned char *msg_strs; 40 41 check_cpu(&cpu_level, &req_level, &err_flags); 42 43 if (cpu_level < req_level) { 44 printf("This kernel requires an %s CPU, ", 45 cpu_name(req_level)); 46 printf("but only detected an %s CPU.\n", 47 cpu_name(cpu_level)); 48 return -1; 49 } 50 51 if (err_flags) { 52 int i, j; 53 puts("This kernel requires the following features " 54 "not present on the CPU:\n"); 55 56 msg_strs = (const unsigned char *)x86_cap_strs; 57 58 for (i = 0; i < NCAPINTS; i++) { 59 u32 e = err_flags[i]; 60 61 for (j = 0; j < 32; j++) { 62 if (msg_strs[0] < i || 63 (msg_strs[0] == i && msg_strs[1] < j)) { 64 /* Skip to the next string */ 65 msg_strs += 2; 66 while (*msg_strs++) 67 ; 68 } 69 if (e & 1) { 70 if (msg_strs[0] == i && 71 msg_strs[1] == j && 72 msg_strs[2]) 73 printf("%s ", msg_strs+2); 74 else 75 printf("%d:%d ", i, j); 76 } 77 e >>= 1; 78 } 79 } 80 putchar('\n'); 81 return -1; 82 } else { 83 return 0; 84 } 85 } 86