mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
synced 2026-10-31 06:14:39 +01:00
Ahmed S. Darwish
21834b541d
The x86 library provides x86_family() and x86_model(). They take raw CPUID register output and calculate the CPU family and model from it. In follow-up work, the x86 subsystem will use APIs which access previously-parsed CPUID leafs structure instead of doing direct CPUID queries. These new APIs force using the auto generated leaf data types at <asm/cpuid/leaf_types.h>. Introduce x86 family and model calculation functions that take these auto-generated data types. Refactor the original code so that no logic is duplicated. [ bp: Massage commit message, unbreak too long line. ] Signed-off-by: Ahmed S. Darwish <[email protected]> Signed-off-by: Borislav Petkov (AMD) <[email protected]> Link: https://patch.msgid.link/[email protected]
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/types.h>
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#include <linux/export.h>
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#include <asm/cpu.h>
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#include <asm/cpuid/leaf_types.h>
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static unsigned int __x86_family(unsigned int base_fam, unsigned int ext_fam)
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{
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if (base_fam == 0xf)
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base_fam += ext_fam;
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return base_fam;
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}
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static unsigned int __x86_model(unsigned int family, unsigned int base_model,
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unsigned int ext_model)
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{
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if (family >= 0x6)
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base_model |= ext_model << 4;
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return base_model;
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}
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unsigned int x86_family(unsigned int sig)
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{
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return __x86_family((sig >> 8) & 0xf, (sig >> 20) & 0xff);
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}
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EXPORT_SYMBOL_GPL(x86_family);
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unsigned int x86_model(unsigned int sig)
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{
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return __x86_model(x86_family(sig), (sig >> 4) & 0xf, (sig >> 16) & 0xf);
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}
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EXPORT_SYMBOL_GPL(x86_model);
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unsigned int x86_stepping(unsigned int sig)
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{
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return sig & 0xf;
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}
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EXPORT_SYMBOL_GPL(x86_stepping);
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unsigned int cpuid_family(const struct leaf_0x1_0 *l)
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{
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return __x86_family(l->base_family_id, l->ext_family);
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}
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unsigned int cpuid_model(const struct leaf_0x1_0 *l)
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{
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return __x86_model(cpuid_family(l), l->base_model, l->ext_model);
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}
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