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841326332b
Introduce an AWK script to auto-generate the <asm/cpufeaturemasks.h> header with required and disabled feature masks based on <asm/cpufeatures.h> and the current build config. Thus for any CPU feature with a build config, e.g., X86_FRED, simply add: config X86_DISABLED_FEATURE_FRED def_bool y depends on !X86_FRED to arch/x86/Kconfig.cpufeatures, instead of adding a conditional CPU feature disable flag, e.g., DISABLE_FRED. Lastly, the generated required and disabled feature masks will be added to their corresponding feature masks for this particular compile-time configuration. [ Xin: build integration improvements ] [ mingo: Improved changelog and comments ] Signed-off-by: H. Peter Anvin (Intel) <hpa@zytor.com> Signed-off-by: Xin Li (Intel) <xin@zytor.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Signed-off-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Nikolay Borisov <nik.borisov@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/r/20250305184725.3341760-3-xin@zytor.com
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* ----------------------------------------------------------------------- *
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*
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* Copyright 2008 rPath, Inc. - All Rights Reserved
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*
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* ----------------------------------------------------------------------- */
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/*
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* This is a host program to preprocess the CPU strings into a
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* compact format suitable for the setup code.
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*/
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#include <stdio.h>
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#include "../include/asm/cpufeatures.h"
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#include "../include/asm/vmxfeatures.h"
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#include "../kernel/cpu/capflags.c"
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int main(void)
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{
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int i, j;
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const char *str;
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printf("#include <asm/cpufeaturemasks.h>\n\n");
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printf("static const char x86_cap_strs[] =\n");
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for (i = 0; i < NCAPINTS; i++) {
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for (j = 0; j < 32; j++) {
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str = x86_cap_flags[i*32+j];
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if (i == NCAPINTS-1 && j == 31) {
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/* The last entry must be unconditional; this
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also consumes the compiler-added null
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character */
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if (!str)
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str = "";
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printf("\t\"\\x%02x\\x%02x\"\"%s\"\n",
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i, j, str);
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} else if (str) {
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printf("#if REQUIRED_MASK%d & (1 << %d)\n"
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"\t\"\\x%02x\\x%02x\"\"%s\\0\"\n"
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"#endif\n",
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i, j, i, j, str);
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}
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}
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}
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printf("\t;\n");
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return 0;
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}
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