1 /* 2 * Routines to identify additional cpu features that are scattered in 3 * cpuid space. 4 */ 5 #include <linux/cpu.h> 6 7 #include <asm/memtype.h> 8 #include <asm/apic.h> 9 #include <asm/processor.h> 10 11 #include "cpu.h" 12 13 struct cpuid_bit { 14 u16 feature; 15 u8 reg; 16 u8 bit; 17 u32 level; 18 u32 sub_leaf; 19 }; 20 21 /* 22 * Please keep the leaf sorted by cpuid_bit.level for faster search. 23 * X86_FEATURE_MBA is supported by both Intel and AMD. But the CPUID 24 * levels are different and there is a separate entry for each. 25 */ 26 static const struct cpuid_bit cpuid_bits[] = { 27 { X86_FEATURE_APERFMPERF, CPUID_ECX, 0, 0x00000006, 0 }, 28 { X86_FEATURE_EPB, CPUID_ECX, 3, 0x00000006, 0 }, 29 { X86_FEATURE_INTEL_PPIN, CPUID_EBX, 0, 0x00000007, 1 }, 30 { X86_FEATURE_CQM_LLC, CPUID_EDX, 1, 0x0000000f, 0 }, 31 { X86_FEATURE_CQM_OCCUP_LLC, CPUID_EDX, 0, 0x0000000f, 1 }, 32 { X86_FEATURE_CQM_MBM_TOTAL, CPUID_EDX, 1, 0x0000000f, 1 }, 33 { X86_FEATURE_CQM_MBM_LOCAL, CPUID_EDX, 2, 0x0000000f, 1 }, 34 { X86_FEATURE_CAT_L3, CPUID_EBX, 1, 0x00000010, 0 }, 35 { X86_FEATURE_CAT_L2, CPUID_EBX, 2, 0x00000010, 0 }, 36 { X86_FEATURE_CDP_L3, CPUID_ECX, 2, 0x00000010, 1 }, 37 { X86_FEATURE_CDP_L2, CPUID_ECX, 2, 0x00000010, 2 }, 38 { X86_FEATURE_MBA, CPUID_EBX, 3, 0x00000010, 0 }, 39 { X86_FEATURE_PER_THREAD_MBA, CPUID_ECX, 0, 0x00000010, 3 }, 40 { X86_FEATURE_SGX1, CPUID_EAX, 0, 0x00000012, 0 }, 41 { X86_FEATURE_SGX2, CPUID_EAX, 1, 0x00000012, 0 }, 42 { X86_FEATURE_HW_PSTATE, CPUID_EDX, 7, 0x80000007, 0 }, 43 { X86_FEATURE_CPB, CPUID_EDX, 9, 0x80000007, 0 }, 44 { X86_FEATURE_PROC_FEEDBACK, CPUID_EDX, 11, 0x80000007, 0 }, 45 { X86_FEATURE_MBA, CPUID_EBX, 6, 0x80000008, 0 }, 46 { 0, 0, 0, 0, 0 } 47 }; 48 49 void init_scattered_cpuid_features(struct cpuinfo_x86 *c) 50 { 51 u32 max_level; 52 u32 regs[4]; 53 const struct cpuid_bit *cb; 54 55 for (cb = cpuid_bits; cb->feature; cb++) { 56 57 /* Verify that the level is valid */ 58 max_level = cpuid_eax(cb->level & 0xffff0000); 59 if (max_level < cb->level || 60 max_level > (cb->level | 0xffff)) 61 continue; 62 63 cpuid_count(cb->level, cb->sub_leaf, ®s[CPUID_EAX], 64 ®s[CPUID_EBX], ®s[CPUID_ECX], 65 ®s[CPUID_EDX]); 66 67 if (regs[cb->reg] & (1 << cb->bit)) 68 set_cpu_cap(c, cb->feature); 69 } 70 } 71