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 "bitops.h" 20 #include <asm/cpufeature.h> 21 22 #include "cpustr.h" 23 24 static char *cpu_name(int level) 25 { 26 static char buf[6]; 27 28 if (level == 64) { 29 return "x86-64"; 30 } else { 31 sprintf(buf, "i%d86", level); 32 return buf; 33 } 34 } 35 36 int validate_cpu(void) 37 { 38 u32 *err_flags; 39 int cpu_level, req_level; 40 const unsigned char *msg_strs; 41 42 check_cpu(&cpu_level, &req_level, &err_flags); 43 44 if (cpu_level < req_level) { 45 printf("This kernel requires an %s CPU, ", 46 cpu_name(req_level)); 47 printf("but only detected an %s CPU.\n", 48 cpu_name(cpu_level)); 49 return -1; 50 } 51 52 if (err_flags) { 53 int i, j; 54 puts("This kernel requires the following features " 55 "not present on the CPU:\n"); 56 57 msg_strs = (const unsigned char *)x86_cap_strs; 58 59 for (i = 0; i < NCAPINTS; i++) { 60 u32 e = err_flags[i]; 61 62 for (j = 0; j < 32; j++) { 63 int n = (i << 5)+j; 64 if (*msg_strs < n) { 65 /* Skip to the next string */ 66 do { 67 msg_strs++; 68 } while (*msg_strs); 69 msg_strs++; 70 } 71 if (e & 1) { 72 if (*msg_strs == n && msg_strs[1]) 73 printf("%s ", msg_strs+1); 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