/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or

    modify it under the terms of the GNU Lesser General Public

    License as published by the Free Software Foundation; either

    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public

    License along with this library; if not, write to the Free Software

    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga

    slouken@libsdl.org

*/

#include "SDL_config.h"

/* CPU feature detection for SDL */

#include "SDL_cpuinfo.h"

#ifdef HAVE_SYSCONF

#include <unistd.h>

#endif

#ifdef HAVE_SYSCTLBYNAME

#include <sys/types.h>

#include <sys/sysctl.h>

#endif

#if defined(__MACOSX__) && (defined(__ppc__) || defined(__ppc64__))

#include <sys/sysctl.h>         /* For AltiVec check */

#elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP

#include <signal.h>

#include <setjmp.h>

#endif

#ifdef __WIN32__

#define WIN32_LEAN_AND_MEAN

#include <windows.h>

#endif

#define CPU_HAS_RDTSC   0x00000001

#define CPU_HAS_MMX     0x00000002

#define CPU_HAS_MMXEXT  0x00000004

#define CPU_HAS_3DNOW   0x00000010

#define CPU_HAS_3DNOWEXT 0x00000020

#define CPU_HAS_SSE     0x00000040

#define CPU_HAS_SSE2    0x00000080

#define CPU_HAS_ALTIVEC 0x00000100

#if SDL_ALTIVEC_BLITTERS && HAVE_SETJMP && !__MACOSX__

/* This is the brute force way of detecting instruction sets...

   the idea is borrowed from the libmpeg2 library - thanks!

 */

static jmp_buf jmpbuf;

static void

illegal_instruction(int sig)

{

    longjmp(jmpbuf, 1);

}

#endif /* HAVE_SETJMP */

static __inline__ int

CPU_haveCPUID(void)

{

    int has_CPUID = 0;

/* *INDENT-OFF* */

#if defined(__GNUC__) && defined(i386)

    __asm__ (

"        pushfl                      # Get original EFLAGS             \n"

"        popl    %%eax                                                 \n"

"        movl    %%eax,%%ecx                                           \n"

"        xorl    $0x200000,%%eax     # Flip ID bit in EFLAGS           \n"

"        pushl   %%eax               # Save new EFLAGS value on stack  \n"

"        popfl                       # Replace current EFLAGS value    \n"

"        pushfl                      # Get new EFLAGS                  \n"

"        popl    %%eax               # Store new EFLAGS in EAX         \n"

"        xorl    %%ecx,%%eax         # Can not toggle ID bit,          \n"

"        jz      1f                  # Processor=80486                 \n"

"        movl    $1,%0               # We have CPUID support           \n"

"1:                                                                    \n"

    : "=m" (has_CPUID)

    :

    : "%eax", "%ecx"

    );

#elif defined(__GNUC__) && defined(__x86_64__)

/* Technically, if this is being compiled under __x86_64__ then it has 

CPUid by definition.  But it's nice to be able to prove it.  :)      */

    __asm__ (

"        pushfq                      # Get original EFLAGS             \n"

"        popq    %%rax                                                 \n"

"        movq    %%rax,%%rcx                                           \n"

"        xorl    $0x200000,%%eax     # Flip ID bit in EFLAGS           \n"

"        pushq   %%rax               # Save new EFLAGS value on stack  \n"

"        popfq                       # Replace current EFLAGS value    \n"

"        pushfq                      # Get new EFLAGS                  \n"

"        popq    %%rax               # Store new EFLAGS in EAX         \n"

"        xorl    %%ecx,%%eax         # Can not toggle ID bit,          \n"

"        jz      1f                  # Processor=80486                 \n"

"        movl    $1,%0               # We have CPUID support           \n"

"1:                                                                    \n"

    : "=m" (has_CPUID)

    :

    : "%rax", "%rcx"

    );

#elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)

    __asm {

        pushfd                      ; Get original EFLAGS

        pop     eax

        mov     ecx, eax

        xor     eax, 200000h        ; Flip ID bit in EFLAGS

        push    eax                 ; Save new EFLAGS value on stack

        popfd                       ; Replace current EFLAGS value

        pushfd                      ; Get new EFLAGS

        pop     eax                 ; Store new EFLAGS in EAX

        xor     eax, ecx            ; Can not toggle ID bit,

        jz      done                ; Processor=80486

        mov     has_CPUID,1         ; We have CPUID support

done:

    }

#elif defined(__sun) && defined(__i386)

    __asm (

"       pushfl                 \n"

"       popl    %eax           \n"

"       movl    %eax,%ecx      \n"

"       xorl    $0x200000,%eax \n"

"       pushl   %eax           \n"

"       popfl                  \n"

"       pushfl                 \n"

"       popl    %eax           \n"

"       xorl    %ecx,%eax      \n"

"       jz      1f             \n"

"       movl    $1,-8(%ebp)    \n"

"1:                            \n"

    );

#elif defined(__sun) && defined(__amd64)

    __asm (

"       pushfq                 \n"

"       popq    %rax           \n"

"       movq    %rax,%rcx      \n"

"       xorl    $0x200000,%eax \n"

"       pushq   %rax           \n"

"       popfq                  \n"

"       pushfq                 \n"

"       popq    %rax           \n"

"       xorl    %ecx,%eax      \n"

"       jz      1f             \n"

"       movl    $1,-8(%rbp)    \n"

"1:                            \n"

    );

#endif

/* *INDENT-ON* */

    return has_CPUID;

}

#define cpuid(func, a, b, c, d) \

    __asm__ __volatile__ ( \

"        pushl %%ebx        \n" \

"        cpuid              \n" \

"        movl %%ebx, %%esi  \n" \

"        popl %%ebx         \n" : \

            "=a" (a), "=S" (b), "=c" (c), "=d" (d) : "a" (func))

#elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)

#define cpuid(func, a, b, c, d) \

    __asm { \

        __asm mov eax, func \

        __asm cpuid \

        __asm mov a, eax \

        __asm mov b, ebx \

        __asm mov c, ecx \

        __asm mov d, edx \

    }

#else

#define cpuid(func, a, b, c, d) \

    a = b = c = d = 0

#endif

static __inline__ int

CPU_getCPUIDFeatures(void)

{

    int features = 0;

    int a, b, c, d;

    cpuid(0, a, b, c, d);

    if (a >= 1) {

        cpuid(1, a, b, c, d);

        features = d;

    }

    return features;

}

static __inline__ int

CPU_getCPUIDFeaturesExt(void)

{

    int features = 0;

    int a, b, c, d;

    cpuid(0x80000000, a, b, c, d);

    if (a >= 0x80000001) {

        cpuid(0x80000001, a, b, c, d);

        features = d;

    }

    return features;

}

static __inline__ int

CPU_haveRDTSC(void)

{

    if (CPU_haveCPUID()) {

        return (CPU_getCPUIDFeatures() & 0x00000010);

    }

    return 0;

}

static __inline__ int

CPU_haveMMX(void)

{

    if (CPU_haveCPUID()) {

        return (CPU_getCPUIDFeatures() & 0x00800000);

    }

    return 0;

}

static __inline__ int

CPU_haveMMXExt(void)

{

    if (CPU_haveCPUID()) {

        return (CPU_getCPUIDFeaturesExt() & 0x00400000);

    }

    return 0;

}

static __inline__ int

CPU_have3DNow(void)

{

    if (CPU_haveCPUID()) {

        return (CPU_getCPUIDFeaturesExt() & 0x80000000);

    }

    return 0;

}

static __inline__ int

CPU_have3DNowExt(void)

{

    if (CPU_haveCPUID()) {

        return (CPU_getCPUIDFeaturesExt() & 0x40000000);

    }

    return 0;

}

static __inline__ int

CPU_haveSSE(void)

{

    if (CPU_haveCPUID()) {

        return (CPU_getCPUIDFeatures() & 0x02000000);

    }

    return 0;

}

static __inline__ int

CPU_haveSSE2(void)

{

    if (CPU_haveCPUID()) {

        return (CPU_getCPUIDFeatures() & 0x04000000);

    }

    return 0;

}

static __inline__ int

CPU_haveAltiVec(void)

{

    volatile int altivec = 0;

#if defined(__MACOSX__) && (defined(__ppc__) || defined(__ppc64__))

    int selectors[2] = { CTL_HW, HW_VECTORUNIT };

    int hasVectorUnit = 0;

    size_t length = sizeof(hasVectorUnit);

    int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);

    if (0 == error)

        altivec = (hasVectorUnit != 0);

#elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP

    void (*handler) (int sig);

    handler = signal(SIGILL, illegal_instruction);

    if (setjmp(jmpbuf) == 0) {

        asm volatile ("mtspr 256, %0\n\t" "vand %%v0, %%v0, %%v0"::"r" (-1));

        altivec = 1;

    }

    signal(SIGILL, handler);

#endif

    return altivec;

}

static int SDL_CPUCount = 0;

int

SDL_GetCPUCount()

{

    if (!SDL_CPUCount) {

#ifdef HAVE_SYSCONF

        if (SDL_CPUCount <= 0) {

            SDL_CPUCount = (int)sysconf(_SC_NPROCESSORS_ONLN);

        }

#endif

#ifdef HAVE_SYSCTLBYNAME

        if (SDL_CPUCount <= 0) {

            size_t size = sizeof(SDL_CPUCount);

            sysctlbyname("hw.ncpu", &SDL_CPUCount, &size, NULL, 0);

        }

#endif

#ifdef __WIN32__

        if (SDL_CPUCount <= 0) {

            SYSTEM_INFO info;

            GetSystemInfo(&info);

            SDL_CPUCount = info.dwNumberOfProcessors;

        }

#endif

        /* There has to be at least 1, right? :) */

        if (SDL_CPUCount <= 0) {

            SDL_CPUCount = 1;

        }

    }

    return SDL_CPUCount;

}

/* Oh, such a sweet sweet trick, just not very useful. :) */

const char *

SDL_GetCPUType()

{

    static char SDL_CPUType[48];

    if (!SDL_CPUType[0]) {

        int i = 0;

        int a, b, c, d;

        if (CPU_haveCPUID()) {

            cpuid(0x80000000, a, b, c, d);

            if (a >= 0x80000004) {

                cpuid(0x80000002, a, b, c, d);

                SDL_CPUType[i++] = (char)(a & 0xff); a >>= 8;

                SDL_CPUType[i++] = (char)(a & 0xff); a >>= 8;

                SDL_CPUType[i++] = (char)(a & 0xff); a >>= 8;

                SDL_CPUType[i++] = (char)(a & 0xff); a >>= 8;

                SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;

                SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;

                SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;

                SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;

                SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;

                SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;

                SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;

                SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;

                SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;

                SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;

                SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;

                SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;

                cpuid(0x80000003, a, b, c, d);

                SDL_CPUType[i++] = (char)(a & 0xff); a >>= 8;

                SDL_CPUType[i++] = (char)(a & 0xff); a >>= 8;

                SDL_CPUType[i++] = (char)(a & 0xff); a >>= 8;

                SDL_CPUType[i++] = (char)(a & 0xff); a >>= 8;

                SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;

                SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;

                SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;

                SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;

                SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;

                SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;

                SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;

                SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;

                SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;

                SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;

                SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;

                SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;

                cpuid(0x80000004, a, b, c, d);

                SDL_CPUType[i++] = (char)(a & 0xff); a >>= 8;

                SDL_CPUType[i++] = (char)(a & 0xff); a >>= 8;

                SDL_CPUType[i++] = (char)(a & 0xff); a >>= 8;

                SDL_CPUType[i++] = (char)(a & 0xff); a >>= 8;

                SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;

                SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;

                SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;

                SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;

                SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;

                SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;

                SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;

                SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;

                SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;

                SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;

                SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;

                SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;

            }

        }

        if (!SDL_CPUType[0]) {

            SDL_strlcpy(SDL_CPUType, "Unknown", sizeof(SDL_CPUType));

        }

    }

    return SDL_CPUType;

}

static Uint32 SDL_CPUFeatures = 0xFFFFFFFF;

static Uint32

SDL_GetCPUFeatures(void)

{

    if (SDL_CPUFeatures == 0xFFFFFFFF) {

        SDL_CPUFeatures = 0;

        if (CPU_haveRDTSC()) {

            SDL_CPUFeatures |= CPU_HAS_RDTSC;

        }

        if (CPU_haveMMX()) {

            SDL_CPUFeatures |= CPU_HAS_MMX;

        }

        if (CPU_haveMMXExt()) {

            SDL_CPUFeatures |= CPU_HAS_MMXEXT;

        }

        if (CPU_have3DNow()) {

            SDL_CPUFeatures |= CPU_HAS_3DNOW;

        }

        if (CPU_have3DNowExt()) {

            SDL_CPUFeatures |= CPU_HAS_3DNOWEXT;

        }

        if (CPU_haveSSE()) {

            SDL_CPUFeatures |= CPU_HAS_SSE;

        }

        if (CPU_haveSSE2()) {

            SDL_CPUFeatures |= CPU_HAS_SSE2;

        }

        if (CPU_haveAltiVec()) {

            SDL_CPUFeatures |= CPU_HAS_ALTIVEC;

        }

    }

    return SDL_CPUFeatures;

}

SDL_bool

SDL_HasRDTSC(void)

{

    if (SDL_GetCPUFeatures() & CPU_HAS_RDTSC) {

        return SDL_TRUE;

    }

    return SDL_FALSE;

}

SDL_bool

SDL_HasMMX(void)

{

    if (SDL_GetCPUFeatures() & CPU_HAS_MMX) {

        return SDL_TRUE;

    }

    return SDL_FALSE;

}

SDL_bool

SDL_HasMMXExt(void)

{

    if (SDL_GetCPUFeatures() & CPU_HAS_MMXEXT) {

        return SDL_TRUE;

    }

    return SDL_FALSE;

}

SDL_bool

SDL_Has3DNow(void)

{

    if (SDL_GetCPUFeatures() & CPU_HAS_3DNOW) {

        return SDL_TRUE;

    }

    return SDL_FALSE;

}

SDL_bool

SDL_Has3DNowExt(void)

{

    if (SDL_GetCPUFeatures() & CPU_HAS_3DNOWEXT) {

        return SDL_TRUE;

    }

    return SDL_FALSE;