47ff5bc938
commit 2ccd71f1b278d450a6f8c8c737c7fe237ca06dc6 upstream Turn the CPUID leafs which are proper CPUID feature bit leafs into separate ->x86_capability words. Signed-off-by: Borislav Petkov <bp@suse.de> Link: http://lkml.kernel.org/r/1449481182-27541-2-git-send-email-bp@alien8.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Srivatsa S. Bhat <srivatsa@csail.mit.edu> Reviewed-by: Matt Helsley (VMware) <matt.helsley@gmail.com> Reviewed-by: Alexey Makhalov <amakhalov@vmware.com> Reviewed-by: Bo Gan <ganb@vmware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
57 lines
1.2 KiB
C
57 lines
1.2 KiB
C
/*
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* Routines to identify additional cpu features that are scattered in
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* cpuid space.
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*/
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#include <linux/cpu.h>
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#include <asm/pat.h>
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#include <asm/processor.h>
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#include <asm/apic.h>
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struct cpuid_bit {
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u16 feature;
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u8 reg;
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u8 bit;
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u32 level;
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u32 sub_leaf;
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};
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enum cpuid_regs {
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CR_EAX = 0,
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CR_ECX,
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CR_EDX,
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CR_EBX
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};
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void init_scattered_cpuid_features(struct cpuinfo_x86 *c)
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{
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u32 max_level;
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u32 regs[4];
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const struct cpuid_bit *cb;
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static const struct cpuid_bit cpuid_bits[] = {
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{ X86_FEATURE_INTEL_PT, CR_EBX,25, 0x00000007, 0 },
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{ X86_FEATURE_APERFMPERF, CR_ECX, 0, 0x00000006, 0 },
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{ X86_FEATURE_EPB, CR_ECX, 3, 0x00000006, 0 },
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{ X86_FEATURE_HW_PSTATE, CR_EDX, 7, 0x80000007, 0 },
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{ X86_FEATURE_CPB, CR_EDX, 9, 0x80000007, 0 },
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{ X86_FEATURE_PROC_FEEDBACK, CR_EDX,11, 0x80000007, 0 },
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{ 0, 0, 0, 0, 0 }
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};
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for (cb = cpuid_bits; cb->feature; cb++) {
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/* Verify that the level is valid */
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max_level = cpuid_eax(cb->level & 0xffff0000);
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if (max_level < cb->level ||
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max_level > (cb->level | 0xffff))
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continue;
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cpuid_count(cb->level, cb->sub_leaf, ®s[CR_EAX],
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®s[CR_EBX], ®s[CR_ECX], ®s[CR_EDX]);
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if (regs[cb->reg] & (1 << cb->bit))
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set_cpu_cap(c, cb->feature);
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}
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}
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