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67 lines
2.0 KiB
67 lines
2.0 KiB
/* |
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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/memtype.h> |
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#include <asm/apic.h> |
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#include <asm/processor.h> |
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#include "cpu.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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/* |
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* Please keep the leaf sorted by cpuid_bit.level for faster search. |
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* X86_FEATURE_MBA is supported by both Intel and AMD. But the CPUID |
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* levels are different and there is a separate entry for each. |
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*/ |
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static const struct cpuid_bit cpuid_bits[] = { |
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{ X86_FEATURE_APERFMPERF, CPUID_ECX, 0, 0x00000006, 0 }, |
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{ X86_FEATURE_EPB, CPUID_ECX, 3, 0x00000006, 0 }, |
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{ X86_FEATURE_CQM_LLC, CPUID_EDX, 1, 0x0000000f, 0 }, |
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{ X86_FEATURE_CQM_OCCUP_LLC, CPUID_EDX, 0, 0x0000000f, 1 }, |
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{ X86_FEATURE_CQM_MBM_TOTAL, CPUID_EDX, 1, 0x0000000f, 1 }, |
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{ X86_FEATURE_CQM_MBM_LOCAL, CPUID_EDX, 2, 0x0000000f, 1 }, |
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{ X86_FEATURE_CAT_L3, CPUID_EBX, 1, 0x00000010, 0 }, |
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{ X86_FEATURE_CAT_L2, CPUID_EBX, 2, 0x00000010, 0 }, |
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{ X86_FEATURE_CDP_L3, CPUID_ECX, 2, 0x00000010, 1 }, |
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{ X86_FEATURE_CDP_L2, CPUID_ECX, 2, 0x00000010, 2 }, |
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{ X86_FEATURE_MBA, CPUID_EBX, 3, 0x00000010, 0 }, |
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{ X86_FEATURE_PER_THREAD_MBA, CPUID_ECX, 0, 0x00000010, 3 }, |
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{ X86_FEATURE_HW_PSTATE, CPUID_EDX, 7, 0x80000007, 0 }, |
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{ X86_FEATURE_CPB, CPUID_EDX, 9, 0x80000007, 0 }, |
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{ X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 }, |
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{ X86_FEATURE_MBA, CPUID_EBX, 6, 0x80000008, 0 }, |
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{ 0, 0, 0, 0, 0 } |
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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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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[CPUID_EAX], |
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®s[CPUID_EBX], ®s[CPUID_ECX], |
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®s[CPUID_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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