zig/lib/include/cpuid.h

/*===---- cpuid.h - X86 cpu model detection --------------------------------===
 *
 * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 * See https://llvm.org/LICENSE.txt for license information.
 * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 *
 *===-----------------------------------------------------------------------===
 */

#ifndef __CPUID_H
#define __CPUID_H

#if !(__x86_64__ || __i386__)
#error this header is for x86 only
#endif

/* Responses identification request with %eax 0 */
/* AMD:     "AuthenticAMD" */
#define signature_AMD_ebx 0x68747541
#define signature_AMD_edx 0x69746e65
#define signature_AMD_ecx 0x444d4163
/* CENTAUR: "CentaurHauls" */
#define signature_CENTAUR_ebx 0x746e6543
#define signature_CENTAUR_edx 0x48727561
#define signature_CENTAUR_ecx 0x736c7561
/* CYRIX:   "CyrixInstead" */
#define signature_CYRIX_ebx 0x69727943
#define signature_CYRIX_edx 0x736e4978
#define signature_CYRIX_ecx 0x64616574
/* HYGON:   "HygonGenuine" */
#define signature_HYGON_ebx 0x6f677948
#define signature_HYGON_edx 0x6e65476e
#define signature_HYGON_ecx 0x656e6975
/* INTEL:   "GenuineIntel" */
#define signature_INTEL_ebx 0x756e6547
#define signature_INTEL_edx 0x49656e69
#define signature_INTEL_ecx 0x6c65746e
/* TM1:     "TransmetaCPU" */
#define signature_TM1_ebx 0x6e617254
#define signature_TM1_edx 0x74656d73
#define signature_TM1_ecx 0x55504361
/* TM2:     "GenuineTMx86" */
#define signature_TM2_ebx 0x756e6547
#define signature_TM2_edx 0x54656e69
#define signature_TM2_ecx 0x3638784d
/* NSC:     "Geode by NSC" */
#define signature_NSC_ebx 0x646f6547
#define signature_NSC_edx 0x79622065
#define signature_NSC_ecx 0x43534e20
/* NEXGEN:  "NexGenDriven" */
#define signature_NEXGEN_ebx 0x4778654e
#define signature_NEXGEN_edx 0x72446e65
#define signature_NEXGEN_ecx 0x6e657669
/* RISE:    "RiseRiseRise" */
#define signature_RISE_ebx 0x65736952
#define signature_RISE_edx 0x65736952
#define signature_RISE_ecx 0x65736952
/* SIS:     "SiS SiS SiS " */
#define signature_SIS_ebx 0x20536953
#define signature_SIS_edx 0x20536953
#define signature_SIS_ecx 0x20536953
/* UMC:     "UMC UMC UMC " */
#define signature_UMC_ebx 0x20434d55
#define signature_UMC_edx 0x20434d55
#define signature_UMC_ecx 0x20434d55
/* VIA:     "VIA VIA VIA " */
#define signature_VIA_ebx 0x20414956
#define signature_VIA_edx 0x20414956
#define signature_VIA_ecx 0x20414956
/* VORTEX:  "Vortex86 SoC" */
#define signature_VORTEX_ebx 0x74726f56
#define signature_VORTEX_edx 0x36387865
#define signature_VORTEX_ecx 0x436f5320

/* Features in %ecx for leaf 1 */
#define bit_SSE3        0x00000001
#define bit_PCLMULQDQ   0x00000002
#define bit_PCLMUL      bit_PCLMULQDQ   /* for gcc compat */
#define bit_DTES64      0x00000004
#define bit_MONITOR     0x00000008
#define bit_DSCPL       0x00000010
#define bit_VMX         0x00000020
#define bit_SMX         0x00000040
#define bit_EIST        0x00000080
#define bit_TM2         0x00000100
#define bit_SSSE3       0x00000200
#define bit_CNXTID      0x00000400
#define bit_FMA         0x00001000
#define bit_CMPXCHG16B  0x00002000
#define bit_xTPR        0x00004000
#define bit_PDCM        0x00008000
#define bit_PCID        0x00020000
#define bit_DCA         0x00040000
#define bit_SSE41       0x00080000
#define bit_SSE4_1      bit_SSE41       /* for gcc compat */
#define bit_SSE42       0x00100000
#define bit_SSE4_2      bit_SSE42       /* for gcc compat */
#define bit_x2APIC      0x00200000
#define bit_MOVBE       0x00400000
#define bit_POPCNT      0x00800000
#define bit_TSCDeadline 0x01000000
#define bit_AESNI       0x02000000
#define bit_AES         bit_AESNI       /* for gcc compat */
#define bit_XSAVE       0x04000000
#define bit_OSXSAVE     0x08000000
#define bit_AVX         0x10000000
#define bit_F16C        0x20000000
#define bit_RDRND       0x40000000

/* Features in %edx for leaf 1 */
#define bit_FPU         0x00000001
#define bit_VME         0x00000002
#define bit_DE          0x00000004
#define bit_PSE         0x00000008
#define bit_TSC         0x00000010
#define bit_MSR         0x00000020
#define bit_PAE         0x00000040
#define bit_MCE         0x00000080
#define bit_CX8         0x00000100
#define bit_CMPXCHG8B   bit_CX8         /* for gcc compat */
#define bit_APIC        0x00000200
#define bit_SEP         0x00000800
#define bit_MTRR        0x00001000
#define bit_PGE         0x00002000
#define bit_MCA         0x00004000
#define bit_CMOV        0x00008000
#define bit_PAT         0x00010000
#define bit_PSE36       0x00020000
#define bit_PSN         0x00040000
#define bit_CLFSH       0x00080000
#define bit_DS          0x00200000
#define bit_ACPI        0x00400000
#define bit_MMX         0x00800000
#define bit_FXSR        0x01000000
#define bit_FXSAVE      bit_FXSR        /* for gcc compat */
#define bit_SSE         0x02000000
#define bit_SSE2        0x04000000
#define bit_SS          0x08000000
#define bit_HTT         0x10000000
#define bit_TM          0x20000000
#define bit_PBE         0x80000000

/* Features in %ebx for leaf 7 sub-leaf 0 */
#define bit_FSGSBASE    0x00000001
#define bit_SGX         0x00000004
#define bit_BMI         0x00000008
#define bit_HLE         0x00000010
#define bit_AVX2        0x00000020
#define bit_SMEP        0x00000080
#define bit_BMI2        0x00000100
#define bit_ENH_MOVSB   0x00000200
#define bit_INVPCID     0x00000400
#define bit_RTM         0x00000800
#define bit_MPX         0x00004000
#define bit_AVX512F     0x00010000
#define bit_AVX512DQ    0x00020000
#define bit_RDSEED      0x00040000
#define bit_ADX         0x00080000
#define bit_AVX512IFMA  0x00200000
#define bit_CLFLUSHOPT  0x00800000
#define bit_CLWB        0x01000000
#define bit_AVX512PF    0x04000000
#define bit_AVX512ER    0x08000000
#define bit_AVX512CD    0x10000000
#define bit_SHA         0x20000000
#define bit_AVX512BW    0x40000000
#define bit_AVX512VL    0x80000000

/* Features in %ecx for leaf 7 sub-leaf 0 */
#define bit_PREFTCHWT1       0x00000001
#define bit_AVX512VBMI       0x00000002
#define bit_PKU              0x00000004
#define bit_OSPKE            0x00000010
#define bit_WAITPKG          0x00000020
#define bit_AVX512VBMI2      0x00000040
#define bit_SHSTK            0x00000080
#define bit_GFNI             0x00000100
#define bit_VAES             0x00000200
#define bit_VPCLMULQDQ       0x00000400
#define bit_AVX512VNNI       0x00000800
#define bit_AVX512BITALG     0x00001000
#define bit_AVX512VPOPCNTDQ  0x00004000
#define bit_RDPID            0x00400000
#define bit_CLDEMOTE         0x02000000
#define bit_MOVDIRI          0x08000000
#define bit_MOVDIR64B        0x10000000
#define bit_ENQCMD           0x20000000

/* Features in %edx for leaf 7 sub-leaf 0 */
#define bit_AVX5124VNNIW  0x00000004
#define bit_AVX5124FMAPS  0x00000008
#define bit_UINTR         0x00000020
#define bit_SERIALIZE     0x00004000
#define bit_TSXLDTRK      0x00010000
#define bit_PCONFIG       0x00040000
#define bit_IBT           0x00100000
#define bit_AMXBF16       0x00400000
#define bit_AVX512FP16    0x00800000
#define bit_AMXTILE       0x01000000
#define bit_AMXINT8       0x02000000

/* Features in %eax for leaf 7 sub-leaf 1 */
#define bit_AVXVNNI       0x00000010
#define bit_AVX512BF16    0x00000020
#define bit_HRESET        0x00400000

/* Features in %eax for leaf 13 sub-leaf 1 */
#define bit_XSAVEOPT    0x00000001
#define bit_XSAVEC      0x00000002
#define bit_XSAVES      0x00000008

/* Features in %eax for leaf 0x14 sub-leaf 0 */
#define bit_PTWRITE     0x00000010

/* Features in %ecx for leaf 0x80000001 */
#define bit_LAHF_LM     0x00000001
#define bit_ABM         0x00000020
#define bit_LZCNT       bit_ABM        /* for gcc compat */
#define bit_SSE4a       0x00000040
#define bit_PRFCHW      0x00000100
#define bit_XOP         0x00000800
#define bit_LWP         0x00008000
#define bit_FMA4        0x00010000
#define bit_TBM         0x00200000
#define bit_MWAITX      0x20000000

/* Features in %edx for leaf 0x80000001 */
#define bit_MMXEXT      0x00400000
#define bit_LM          0x20000000
#define bit_3DNOWP      0x40000000
#define bit_3DNOW       0x80000000

/* Features in %ebx for leaf 0x80000008 */
#define bit_CLZERO      0x00000001
#define bit_RDPRU       0x00000010
#define bit_WBNOINVD    0x00000200


#if __i386__
#define __cpuid(__leaf, __eax, __ebx, __ecx, __edx) \
    __asm("cpuid" : "=a"(__eax), "=b" (__ebx), "=c"(__ecx), "=d"(__edx) \
                  : "0"(__leaf))

#define __cpuid_count(__leaf, __count, __eax, __ebx, __ecx, __edx) \
    __asm("cpuid" : "=a"(__eax), "=b" (__ebx), "=c"(__ecx), "=d"(__edx) \
                  : "0"(__leaf), "2"(__count))
#else
/* x86-64 uses %rbx as the base register, so preserve it. */
#define __cpuid(__leaf, __eax, __ebx, __ecx, __edx) \
    __asm("  xchgq  %%rbx,%q1\n" \
          "  cpuid\n" \
          "  xchgq  %%rbx,%q1" \
        : "=a"(__eax), "=r" (__ebx), "=c"(__ecx), "=d"(__edx) \
        : "0"(__leaf))

#define __cpuid_count(__leaf, __count, __eax, __ebx, __ecx, __edx) \
    __asm("  xchgq  %%rbx,%q1\n" \
          "  cpuid\n" \
          "  xchgq  %%rbx,%q1" \
        : "=a"(__eax), "=r" (__ebx), "=c"(__ecx), "=d"(__edx) \
        : "0"(__leaf), "2"(__count))
#endif

static __inline int __get_cpuid_max (unsigned int __leaf, unsigned int *__sig)
{
    unsigned int __eax, __ebx, __ecx, __edx;
#if __i386__
    int __cpuid_supported;

    __asm("  pushfl\n"
          "  popl   %%eax\n"
          "  movl   %%eax,%%ecx\n"
          "  xorl   $0x00200000,%%eax\n"
          "  pushl  %%eax\n"
          "  popfl\n"
          "  pushfl\n"
          "  popl   %%eax\n"
          "  movl   $0,%0\n"
          "  cmpl   %%eax,%%ecx\n"
          "  je     1f\n"
          "  movl   $1,%0\n"
          "1:"
        : "=r" (__cpuid_supported) : : "eax", "ecx");
    if (!__cpuid_supported)
        return 0;
#endif

    __cpuid(__leaf, __eax, __ebx, __ecx, __edx);
    if (__sig)
        *__sig = __ebx;
    return __eax;
}

static __inline int __get_cpuid (unsigned int __leaf, unsigned int *__eax,
                                 unsigned int *__ebx, unsigned int *__ecx,
                                 unsigned int *__edx)
{
    unsigned int __max_leaf = __get_cpuid_max(__leaf & 0x80000000, 0);

    if (__max_leaf == 0 || __max_leaf < __leaf)
        return 0;

    __cpuid(__leaf, *__eax, *__ebx, *__ecx, *__edx);
    return 1;
}

static __inline int __get_cpuid_count (unsigned int __leaf,
                                       unsigned int __subleaf,
                                       unsigned int *__eax, unsigned int *__ebx,
                                       unsigned int *__ecx, unsigned int *__edx)
{
    unsigned int __max_leaf = __get_cpuid_max(__leaf & 0x80000000, 0);

    if (__max_leaf == 0 || __max_leaf < __leaf)
        return 0;

    __cpuid_count(__leaf, __subleaf, *__eax, *__ebx, *__ecx, *__edx);
    return 1;
}

#endif /* __CPUID_H */