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99 lines
2.0 KiB
99 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* -*- linux-c -*- ------------------------------------------------------- * |
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* |
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* Copyright (C) 1991, 1992 Linus Torvalds |
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* Copyright 2007-2008 rPath, Inc. - All Rights Reserved |
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* |
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* ----------------------------------------------------------------------- */ |
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/* |
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* arch/x86/boot/cpu.c |
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* |
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* Check for obligatory CPU features and abort if the features are not |
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* present. |
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*/ |
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#include "boot.h" |
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#ifdef CONFIG_X86_FEATURE_NAMES |
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#include "cpustr.h" |
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#endif |
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static char *cpu_name(int level) |
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{ |
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static char buf[6]; |
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if (level == 64) { |
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return "x86-64"; |
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} else { |
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if (level == 15) |
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level = 6; |
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sprintf(buf, "i%d86", level); |
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return buf; |
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} |
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} |
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static void show_cap_strs(u32 *err_flags) |
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{ |
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int i, j; |
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#ifdef CONFIG_X86_FEATURE_NAMES |
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const unsigned char *msg_strs = (const unsigned char *)x86_cap_strs; |
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for (i = 0; i < NCAPINTS; i++) { |
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u32 e = err_flags[i]; |
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for (j = 0; j < 32; j++) { |
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if (msg_strs[0] < i || |
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(msg_strs[0] == i && msg_strs[1] < j)) { |
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/* Skip to the next string */ |
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msg_strs += 2; |
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while (*msg_strs++) |
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; |
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} |
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if (e & 1) { |
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if (msg_strs[0] == i && |
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msg_strs[1] == j && |
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msg_strs[2]) |
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printf("%s ", msg_strs+2); |
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else |
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printf("%d:%d ", i, j); |
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} |
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e >>= 1; |
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} |
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} |
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#else |
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for (i = 0; i < NCAPINTS; i++) { |
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u32 e = err_flags[i]; |
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for (j = 0; j < 32; j++) { |
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if (e & 1) |
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printf("%d:%d ", i, j); |
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e >>= 1; |
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} |
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} |
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#endif |
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} |
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int validate_cpu(void) |
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{ |
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u32 *err_flags; |
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int cpu_level, req_level; |
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check_cpu(&cpu_level, &req_level, &err_flags); |
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if (cpu_level < req_level) { |
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printf("This kernel requires an %s CPU, ", |
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cpu_name(req_level)); |
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printf("but only detected an %s CPU.\n", |
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cpu_name(cpu_level)); |
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return -1; |
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} |
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if (err_flags) { |
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puts("This kernel requires the following features " |
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"not present on the CPU:\n"); |
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show_cap_strs(err_flags); |
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putchar('\n'); |
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return -1; |
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} else if (check_knl_erratum()) { |
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return -1; |
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} else { |
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return 0; |
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} |
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}
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