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/*
* Defines x86 CPU feature bits
*/
#ifndef _ASM_X86_CPUFEATURE_H
#define _ASM_X86_CPUFEATURE_H
#include <asm/required-features.h>
#define NCAPINTS 10 /* N 32-bit words worth of info */
/*
* Note: If the comment begins with a quoted string, that string is used
* in /proc/cpuinfo instead of the macro name. If the string is "",
* this feature bit is not displayed in /proc/cpuinfo at all.
*/
/* Intel-defined CPU features, CPUID level 0x00000001 (edx), word 0 */
#define X86_FEATURE_FPU (0*32+ 0) /* Onboard FPU */
#define X86_FEATURE_VME (0*32+ 1) /* Virtual Mode Extensions */
#define X86_FEATURE_DE (0*32+ 2) /* Debugging Extensions */
#define X86_FEATURE_PSE (0*32+ 3) /* Page Size Extensions */
#define X86_FEATURE_TSC (0*32+ 4) /* Time Stamp Counter */
#define X86_FEATURE_MSR (0*32+ 5) /* Model-Specific Registers */
#define X86_FEATURE_PAE (0*32+ 6) /* Physical Address Extensions */
#define X86_FEATURE_MCE (0*32+ 7) /* Machine Check Exception */
#define X86_FEATURE_CX8 (0*32+ 8) /* CMPXCHG8 instruction */
#define X86_FEATURE_APIC (0*32+ 9) /* Onboard APIC */
#define X86_FEATURE_SEP (0*32+11) /* SYSENTER/SYSEXIT */
#define X86_FEATURE_MTRR (0*32+12) /* Memory Type Range Registers */
#define X86_FEATURE_PGE (0*32+13) /* Page Global Enable */
#define X86_FEATURE_MCA (0*32+14) /* Machine Check Architecture */
#define X86_FEATURE_CMOV (0*32+15) /* CMOV instructions */
/* (plus FCMOVcc, FCOMI with FPU) */
#define X86_FEATURE_PAT (0*32+16) /* Page Attribute Table */
#define X86_FEATURE_PSE36 (0*32+17) /* 36-bit PSEs */
#define X86_FEATURE_PN (0*32+18) /* Processor serial number */
#define X86_FEATURE_CLFLSH (0*32+19) /* "clflush" CLFLUSH instruction */
#define X86_FEATURE_DS (0*32+21) /* "dts" Debug Store */
#define X86_FEATURE_ACPI (0*32+22) /* ACPI via MSR */
#define X86_FEATURE_MMX (0*32+23) /* Multimedia Extensions */
#define X86_FEATURE_FXSR (0*32+24) /* FXSAVE/FXRSTOR, CR4.OSFXSR */
#define X86_FEATURE_XMM (0*32+25) /* "sse" */
#define X86_FEATURE_XMM2 (0*32+26) /* "sse2" */
#define X86_FEATURE_SELFSNOOP (0*32+27) /* "ss" CPU self snoop */
#define X86_FEATURE_HT (0*32+28) /* Hyper-Threading */
#define X86_FEATURE_ACC (0*32+29) /* "tm" Automatic clock control */
#define X86_FEATURE_IA64 (0*32+30) /* IA-64 processor */
#define X86_FEATURE_PBE (0*32+31) /* Pending Break Enable */
/* AMD-defined CPU features, CPUID level 0x80000001, word 1 */
/* Don't duplicate feature flags which are redundant with Intel! */
#define X86_FEATURE_SYSCALL (1*32+11) /* SYSCALL/SYSRET */
#define X86_FEATURE_MP (1*32+19) /* MP Capable. */
#define X86_FEATURE_NX (1*32+20) /* Execute Disable */
#define X86_FEATURE_MMXEXT (1*32+22) /* AMD MMX extensions */
#define X86_FEATURE_FXSR_OPT (1*32+25) /* FXSAVE/FXRSTOR optimizations */
#define X86_FEATURE_GBPAGES (1*32+26) /* "pdpe1gb" GB pages */
#define X86_FEATURE_RDTSCP (1*32+27) /* RDTSCP */
#define X86_FEATURE_LM (1*32+29) /* Long Mode (x86-64) */
#define X86_FEATURE_3DNOWEXT (1*32+30) /* AMD 3DNow! extensions */
#define X86_FEATURE_3DNOW (1*32+31) /* 3DNow! */
/* Transmeta-defined CPU features, CPUID level 0x80860001, word 2 */
#define X86_FEATURE_RECOVERY (2*32+ 0) /* CPU in recovery mode */
#define X86_FEATURE_LONGRUN (2*32+ 1) /* Longrun power control */
#define X86_FEATURE_LRTI (2*32+ 3) /* LongRun table interface */
/* Other features, Linux-defined mapping, word 3 */
/* This range is used for feature bits which conflict or are synthesized */
#define X86_FEATURE_CXMMX (3*32+ 0) /* Cyrix MMX extensions */
#define X86_FEATURE_K6_MTRR (3*32+ 1) /* AMD K6 nonstandard MTRRs */
#define X86_FEATURE_CYRIX_ARR (3*32+ 2) /* Cyrix ARRs (= MTRRs) */
#define X86_FEATURE_CENTAUR_MCR (3*32+ 3) /* Centaur MCRs (= MTRRs) */
/* cpu types for specific tunings: */
#define X86_FEATURE_K8 (3*32+ 4) /* "" Opteron, Athlon64 */
#define X86_FEATURE_K7 (3*32+ 5) /* "" Athlon */
#define X86_FEATURE_P3 (3*32+ 6) /* "" P3 */
#define X86_FEATURE_P4 (3*32+ 7) /* "" P4 */
#define X86_FEATURE_CONSTANT_TSC (3*32+ 8) /* TSC ticks at a constant rate */
#define X86_FEATURE_UP (3*32+ 9) /* smp kernel running on up */
#define X86_FEATURE_FXSAVE_LEAK (3*32+10) /* "" FXSAVE leaks FOP/FIP/FOP */
#define X86_FEATURE_ARCH_PERFMON (3*32+11) /* Intel Architectural PerfMon */
#define X86_FEATURE_PEBS (3*32+12) /* Precise-Event Based Sampling */
#define X86_FEATURE_BTS (3*32+13) /* Branch Trace Store */
#define X86_FEATURE_SYSCALL32 (3*32+14) /* "" syscall in ia32 userspace */
#define X86_FEATURE_SYSENTER32 (3*32+15) /* "" sysenter in ia32 userspace */
#define X86_FEATURE_REP_GOOD (3*32+16) /* rep microcode works well */
#define X86_FEATURE_MFENCE_RDTSC (3*32+17) /* "" Mfence synchronizes RDTSC */
#define X86_FEATURE_LFENCE_RDTSC (3*32+18) /* "" Lfence synchronizes RDTSC */
#define X86_FEATURE_11AP (3*32+19) /* "" Bad local APIC aka 11AP */
#define X86_FEATURE_NOPL (3*32+20) /* The NOPL (0F 1F) instructions */
/* 21 available, was AMD_C1E */
#define X86_FEATURE_XTOPOLOGY (3*32+22) /* cpu topology enum extensions */
#define X86_FEATURE_TSC_RELIABLE (3*32+23) /* TSC is known to be reliable */
#define X86_FEATURE_NONSTOP_TSC (3*32+24) /* TSC does not stop in C states */
#define X86_FEATURE_CLFLUSH_MONITOR (3*32+25) /* "" clflush reqd with monitor */
#define X86_FEATURE_EXTD_APICID (3*32+26) /* has extended APICID (8 bits) */
#define X86_FEATURE_AMD_DCM (3*32+27) /* multi-node processor */
#define X86_FEATURE_APERFMPERF (3*32+28) /* APERFMPERF */
/* Intel-defined CPU features, CPUID level 0x00000001 (ecx), word 4 */
#define X86_FEATURE_XMM3 (4*32+ 0) /* "pni" SSE-3 */
#define X86_FEATURE_PCLMULQDQ (4*32+ 1) /* PCLMULQDQ instruction */
#define X86_FEATURE_DTES64 (4*32+ 2) /* 64-bit Debug Store */
#define X86_FEATURE_MWAIT (4*32+ 3) /* "monitor" Monitor/Mwait support */
#define X86_FEATURE_DSCPL (4*32+ 4) /* "ds_cpl" CPL Qual. Debug Store */
#define X86_FEATURE_VMX (4*32+ 5) /* Hardware virtualization */
#define X86_FEATURE_SMX (4*32+ 6) /* Safer mode */
#define X86_FEATURE_EST (4*32+ 7) /* Enhanced SpeedStep */
#define X86_FEATURE_TM2 (4*32+ 8) /* Thermal Monitor 2 */
#define X86_FEATURE_SSSE3 (4*32+ 9) /* Supplemental SSE-3 */
#define X86_FEATURE_CID (4*32+10) /* Context ID */
#define X86_FEATURE_FMA (4*32+12) /* Fused multiply-add */
#define X86_FEATURE_CX16 (4*32+13) /* CMPXCHG16B */
#define X86_FEATURE_XTPR (4*32+14) /* Send Task Priority Messages */
#define X86_FEATURE_PDCM (4*32+15) /* Performance Capabilities */
#define X86_FEATURE_PCID (4*32+17) /* Process Context Identifiers */
#define X86_FEATURE_DCA (4*32+18) /* Direct Cache Access */
#define X86_FEATURE_XMM4_1 (4*32+19) /* "sse4_1" SSE-4.1 */
#define X86_FEATURE_XMM4_2 (4*32+20) /* "sse4_2" SSE-4.2 */
#define X86_FEATURE_X2APIC (4*32+21) /* x2APIC */
#define X86_FEATURE_MOVBE (4*32+22) /* MOVBE instruction */
#define X86_FEATURE_POPCNT (4*32+23) /* POPCNT instruction */
#define X86_FEATURE_TSC_DEADLINE_TIMER (4*32+24) /* Tsc deadline timer */
#define X86_FEATURE_AES (4*32+25) /* AES instructions */
#define X86_FEATURE_XSAVE (4*32+26) /* XSAVE/XRSTOR/XSETBV/XGETBV */
#define X86_FEATURE_OSXSAVE (4*32+27) /* "" XSAVE enabled in the OS */
#define X86_FEATURE_AVX (4*32+28) /* Advanced Vector Extensions */
#define X86_FEATURE_F16C (4*32+29) /* 16-bit fp conversions */
#define X86_FEATURE_RDRAND (4*32+30) /* The RDRAND instruction */
#define X86_FEATURE_HYPERVISOR (4*32+31) /* Running on a hypervisor */
/* VIA/Cyrix/Centaur-defined CPU features, CPUID level 0xC0000001, word 5 */
#define X86_FEATURE_XSTORE (5*32+ 2) /* "rng" RNG present (xstore) */
#define X86_FEATURE_XSTORE_EN (5*32+ 3) /* "rng_en" RNG enabled */
#define X86_FEATURE_XCRYPT (5*32+ 6) /* "ace" on-CPU crypto (xcrypt) */
#define X86_FEATURE_XCRYPT_EN (5*32+ 7) /* "ace_en" on-CPU crypto enabled */
#define X86_FEATURE_ACE2 (5*32+ 8) /* Advanced Cryptography Engine v2 */
#define X86_FEATURE_ACE2_EN (5*32+ 9) /* ACE v2 enabled */
#define X86_FEATURE_PHE (5*32+10) /* PadLock Hash Engine */
#define X86_FEATURE_PHE_EN (5*32+11) /* PHE enabled */
#define X86_FEATURE_PMM (5*32+12) /* PadLock Montgomery Multiplier */
#define X86_FEATURE_PMM_EN (5*32+13) /* PMM enabled */
/* More extended AMD flags: CPUID level 0x80000001, ecx, word 6 */
#define X86_FEATURE_LAHF_LM (6*32+ 0) /* LAHF/SAHF in long mode */
#define X86_FEATURE_CMP_LEGACY (6*32+ 1) /* If yes HyperThreading not valid */
#define X86_FEATURE_SVM (6*32+ 2) /* Secure virtual machine */
#define X86_FEATURE_EXTAPIC (6*32+ 3) /* Extended APIC space */
#define X86_FEATURE_CR8_LEGACY (6*32+ 4) /* CR8 in 32-bit mode */
#define X86_FEATURE_ABM (6*32+ 5) /* Advanced bit manipulation */
#define X86_FEATURE_SSE4A (6*32+ 6) /* SSE-4A */
#define X86_FEATURE_MISALIGNSSE (6*32+ 7) /* Misaligned SSE mode */
#define X86_FEATURE_3DNOWPREFETCH (6*32+ 8) /* 3DNow prefetch instructions */
#define X86_FEATURE_OSVW (6*32+ 9) /* OS Visible Workaround */
#define X86_FEATURE_IBS (6*32+10) /* Instruction Based Sampling */
#define X86_FEATURE_XOP (6*32+11) /* extended AVX instructions */
#define X86_FEATURE_SKINIT (6*32+12) /* SKINIT/STGI instructions */
#define X86_FEATURE_WDT (6*32+13) /* Watchdog timer */
#define X86_FEATURE_LWP (6*32+15) /* Light Weight Profiling */
#define X86_FEATURE_FMA4 (6*32+16) /* 4 operands MAC instructions */
#define X86_FEATURE_NODEID_MSR (6*32+19) /* NodeId MSR */
#define X86_FEATURE_TBM (6*32+21) /* trailing bit manipulations */
#define X86_FEATURE_TOPOEXT (6*32+22) /* topology extensions CPUID leafs */
#define X86_FEATURE_PERFCTR_CORE (6*32+23) /* core performance counter extensions */
/*
* Auxiliary flags: Linux defined - For features scattered in various
* CPUID levels like 0x6, 0xA etc, word 7
*/
#define X86_FEATURE_IDA (7*32+ 0) /* Intel Dynamic Acceleration */
#define X86_FEATURE_ARAT (7*32+ 1) /* Always Running APIC Timer */
#define X86_FEATURE_CPB (7*32+ 2) /* AMD Core Performance Boost */
#define X86_FEATURE_EPB (7*32+ 3) /* IA32_ENERGY_PERF_BIAS support */
#define X86_FEATURE_XSAVEOPT (7*32+ 4) /* Optimized Xsave */
#define X86_FEATURE_PLN (7*32+ 5) /* Intel Power Limit Notification */
#define X86_FEATURE_PTS (7*32+ 6) /* Intel Package Thermal Status */
#define X86_FEATURE_DTS (7*32+ 7) /* Digital Thermal Sensor */
/* Virtualization flags: Linux defined, word 8 */
#define X86_FEATURE_TPR_SHADOW (8*32+ 0) /* Intel TPR Shadow */
#define X86_FEATURE_VNMI (8*32+ 1) /* Intel Virtual NMI */
#define X86_FEATURE_FLEXPRIORITY (8*32+ 2) /* Intel FlexPriority */
#define X86_FEATURE_EPT (8*32+ 3) /* Intel Extended Page Table */
#define X86_FEATURE_VPID (8*32+ 4) /* Intel Virtual Processor ID */
#define X86_FEATURE_NPT (8*32+ 5) /* AMD Nested Page Table support */
#define X86_FEATURE_LBRV (8*32+ 6) /* AMD LBR Virtualization support */
#define X86_FEATURE_SVML (8*32+ 7) /* "svm_lock" AMD SVM locking MSR */
#define X86_FEATURE_NRIPS (8*32+ 8) /* "nrip_save" AMD SVM next_rip save */
#define X86_FEATURE_TSCRATEMSR (8*32+ 9) /* "tsc_scale" AMD TSC scaling support */
#define X86_FEATURE_VMCBCLEAN (8*32+10) /* "vmcb_clean" AMD VMCB clean bits support */
#define X86_FEATURE_FLUSHBYASID (8*32+11) /* AMD flush-by-ASID support */
#define X86_FEATURE_DECODEASSISTS (8*32+12) /* AMD Decode Assists support */
#define X86_FEATURE_PAUSEFILTER (8*32+13) /* AMD filtered pause intercept */
#define X86_FEATURE_PFTHRESHOLD (8*32+14) /* AMD pause filter threshold */
/* Intel-defined CPU features, CPUID level 0x00000007:0 (ebx), word 9 */
#define X86_FEATURE_FSGSBASE (9*32+ 0) /* {RD/WR}{FS/GS}BASE instructions*/
#define X86_FEATURE_SMEP (9*32+ 7) /* Supervisor Mode Execution Protection */
#define X86_FEATURE_ERMS (9*32+ 9) /* Enhanced REP MOVSB/STOSB */
#if defined(__KERNEL__) && !defined(__ASSEMBLY__)
#include <asm/asm.h>
#include <linux/bitops.h>
extern const char * const x86_cap_flags[NCAPINTS*32];
extern const char * const x86_power_flags[32];
#define test_cpu_cap(c, bit) \
test_bit(bit, (unsigned long *)((c)->x86_capability))
#define REQUIRED_MASK_BIT_SET(bit) \
( (((bit)>>5)==0 && (1UL<<((bit)&31) & REQUIRED_MASK0)) || \
(((bit)>>5)==1 && (1UL<<((bit)&31) & REQUIRED_MASK1)) || \
(((bit)>>5)==2 && (1UL<<((bit)&31) & REQUIRED_MASK2)) || \
(((bit)>>5)==3 && (1UL<<((bit)&31) & REQUIRED_MASK3)) || \
(((bit)>>5)==4 && (1UL<<((bit)&31) & REQUIRED_MASK4)) || \
(((bit)>>5)==5 && (1UL<<((bit)&31) & REQUIRED_MASK5)) || \
(((bit)>>5)==6 && (1UL<<((bit)&31) & REQUIRED_MASK6)) || \
(((bit)>>5)==7 && (1UL<<((bit)&31) & REQUIRED_MASK7)) || \
(((bit)>>5)==8 && (1UL<<((bit)&31) & REQUIRED_MASK8)) || \
(((bit)>>5)==9 && (1UL<<((bit)&31) & REQUIRED_MASK9)) )
#define cpu_has(c, bit) \
(__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \
test_cpu_cap(c, bit))
#define this_cpu_has(bit) \
(__builtin_constant_p(bit) && REQUIRED_MASK_BIT_SET(bit) ? 1 : \
x86_this_cpu_test_bit(bit, (unsigned long *)&cpu_info.x86_capability))
#define boot_cpu_has(bit) cpu_has(&boot_cpu_data, bit)
#define set_cpu_cap(c, bit) set_bit(bit, (unsigned long *)((c)->x86_capability))
#define clear_cpu_cap(c, bit) clear_bit(bit, (unsigned long *)((c)->x86_capability))
#define setup_clear_cpu_cap(bit) do { \
clear_cpu_cap(&boot_cpu_data, bit); \
set_bit(bit, (unsigned long *)cpu_caps_cleared); \
} while (0)
#define setup_force_cpu_cap(bit) do { \
set_cpu_cap(&boot_cpu_data, bit); \
set_bit(bit, (unsigned long *)cpu_caps_set); \
} while (0)
#define cpu_has_fpu boot_cpu_has(X86_FEATURE_FPU)
#define cpu_has_vme boot_cpu_has(X86_FEATURE_VME)
#define cpu_has_de boot_cpu_has(X86_FEATURE_DE)
#define cpu_has_pse boot_cpu_has(X86_FEATURE_PSE)
#define cpu_has_tsc boot_cpu_has(X86_FEATURE_TSC)
#define cpu_has_pae boot_cpu_has(X86_FEATURE_PAE)
#define cpu_has_pge boot_cpu_has(X86_FEATURE_PGE)
#define cpu_has_apic boot_cpu_has(X86_FEATURE_APIC)
#define cpu_has_sep boot_cpu_has(X86_FEATURE_SEP)
#define cpu_has_mtrr boot_cpu_has(X86_FEATURE_MTRR)
#define cpu_has_mmx boot_cpu_has(X86_FEATURE_MMX)
#define cpu_has_fxsr boot_cpu_has(X86_FEATURE_FXSR)
#define cpu_has_xmm boot_cpu_has(X86_FEATURE_XMM)
#define cpu_has_xmm2 boot_cpu_has(X86_FEATURE_XMM2)
#define cpu_has_xmm3 boot_cpu_has(X86_FEATURE_XMM3)
#define cpu_has_aes boot_cpu_has(X86_FEATURE_AES)
#define cpu_has_ht boot_cpu_has(X86_FEATURE_HT)
#define cpu_has_mp boot_cpu_has(X86_FEATURE_MP)
#define cpu_has_nx boot_cpu_has(X86_FEATURE_NX)
#define cpu_has_k6_mtrr boot_cpu_has(X86_FEATURE_K6_MTRR)
#define cpu_has_cyrix_arr boot_cpu_has(X86_FEATURE_CYRIX_ARR)
#define cpu_has_centaur_mcr boot_cpu_has(X86_FEATURE_CENTAUR_MCR)
#define cpu_has_xstore boot_cpu_has(X86_FEATURE_XSTORE)
#define cpu_has_xstore_enabled boot_cpu_has(X86_FEATURE_XSTORE_EN)
#define cpu_has_xcrypt boot_cpu_has(X86_FEATURE_XCRYPT)
#define cpu_has_xcrypt_enabled boot_cpu_has(X86_FEATURE_XCRYPT_EN)
#define cpu_has_ace2 boot_cpu_has(X86_FEATURE_ACE2)
#define cpu_has_ace2_enabled boot_cpu_has(X86_FEATURE_ACE2_EN)
#define cpu_has_phe boot_cpu_has(X86_FEATURE_PHE)
#define cpu_has_phe_enabled boot_cpu_has(X86_FEATURE_PHE_EN)
#define cpu_has_pmm boot_cpu_has(X86_FEATURE_PMM)
#define cpu_has_pmm_enabled boot_cpu_has(X86_FEATURE_PMM_EN)
#define cpu_has_ds boot_cpu_has(X86_FEATURE_DS)
#define cpu_has_pebs boot_cpu_has(X86_FEATURE_PEBS)
#define cpu_has_clflush boot_cpu_has(X86_FEATURE_CLFLSH)
#define cpu_has_bts boot_cpu_has(X86_FEATURE_BTS)
#define cpu_has_gbpages boot_cpu_has(X86_FEATURE_GBPAGES)
#define cpu_has_arch_perfmon boot_cpu_has(X86_FEATURE_ARCH_PERFMON)
#define cpu_has_pat boot_cpu_has(X86_FEATURE_PAT)
#define cpu_has_xmm4_1 boot_cpu_has(X86_FEATURE_XMM4_1)
#define cpu_has_xmm4_2 boot_cpu_has(X86_FEATURE_XMM4_2)
#define cpu_has_x2apic boot_cpu_has(X86_FEATURE_X2APIC)
#define cpu_has_xsave boot_cpu_has(X86_FEATURE_XSAVE)
#define cpu_has_hypervisor boot_cpu_has(X86_FEATURE_HYPERVISOR)
#define cpu_has_pclmulqdq boot_cpu_has(X86_FEATURE_PCLMULQDQ)
#define cpu_has_perfctr_core boot_cpu_has(X86_FEATURE_PERFCTR_CORE)
#define cpu_has_cx8 boot_cpu_has(X86_FEATURE_CX8)
#define cpu_has_cx16 boot_cpu_has(X86_FEATURE_CX16)
#if defined(CONFIG_X86_INVLPG) || defined(CONFIG_X86_64)
# define cpu_has_invlpg 1
#else
# define cpu_has_invlpg (boot_cpu_data.x86 > 3)
#endif
#ifdef CONFIG_X86_64
#undef cpu_has_vme
#define cpu_has_vme 0
#undef cpu_has_pae
#define cpu_has_pae ___BUG___
#undef cpu_has_mp
#define cpu_has_mp 1
#undef cpu_has_k6_mtrr
#define cpu_has_k6_mtrr 0
#undef cpu_has_cyrix_arr
#define cpu_has_cyrix_arr 0
#undef cpu_has_centaur_mcr
#define cpu_has_centaur_mcr 0
#endif /* CONFIG_X86_64 */
#if __GNUC__ >= 4
/*
* Static testing of CPU features. Used the same as boot_cpu_has().
* These are only valid after alternatives have run, but will statically
* patch the target code for additional performance.
*
*/
static __always_inline __pure bool __static_cpu_has(u16 bit)
{
#if __GNUC__ > 4 || __GNUC_MINOR__ >= 5
asm goto("1: jmp %l[t_no]\n"
"2:\n"
".section .altinstructions,\"a\"\n"
" .long 1b - .\n"
" .long 0\n" /* no replacement */
" .word %P0\n" /* feature bit */
" .byte 2b - 1b\n" /* source len */
" .byte 0\n" /* replacement len */
".previous\n"
/* skipping size check since replacement size = 0 */
: : "i" (bit) : : t_no);
return true;
t_no:
return false;
#else
u8 flag;
/* Open-coded due to __stringify() in ALTERNATIVE() */
asm volatile("1: movb $0,%0\n"
"2:\n"
".section .altinstructions,\"a\"\n"
" .long 1b - .\n"
" .long 3f - .\n"
" .word %P1\n" /* feature bit */
" .byte 2b - 1b\n" /* source len */
" .byte 4f - 3f\n" /* replacement len */
".previous\n"
".section .discard,\"aw\",@progbits\n"
" .byte 0xff + (4f-3f) - (2b-1b)\n" /* size check */
".previous\n"
".section .altinstr_replacement,\"ax\"\n"
"3: movb $1,%0\n"
"4:\n"
".previous\n"
: "=qm" (flag) : "i" (bit));
return flag;
#endif
}
#define static_cpu_has(bit) \
( \
__builtin_constant_p(boot_cpu_has(bit)) ? \
boot_cpu_has(bit) : \
__builtin_constant_p(bit) ? \
__static_cpu_has(bit) : \
boot_cpu_has(bit) \
)
#else
/*
* gcc 3.x is too stupid to do the static test; fall back to dynamic.
*/
#define static_cpu_has(bit) boot_cpu_has(bit)
#endif
#endif /* defined(__KERNEL__) && !defined(__ASSEMBLY__) */
#endif /* _ASM_X86_CPUFEATURE_H */
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