/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2006 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.h"

#include "SDL_cpuinfo.h"

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

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

#elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP

#include <signal.h>

#include <setjmp.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;

#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, 200000 h;

        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(__x86)

    __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

    return has_CPUID;

}

static __inline__ int

CPU_getCPUIDFeatures(void)

{

    int features = 0;

#if defined(__GNUC__) && ( defined(i386) || defined(__x86_64__) )

  __asm__("        movl    %%ebx,%%edi\n" "        xorl    %%eax,%%eax         # Set up for CPUID instruction    \n" "        cpuid                       # Get and save vendor ID          \n" "        cmpl    $1,%%eax            # Make sure 1 is valid input for CPUID\n" "        jl      1f                  # We dont have the CPUID instruction\n" "        xorl    %%eax,%%eax                                           \n" "        incl    %%eax                                                 \n" "        cpuid                       # Get family/model/stepping/features\n" "        movl    %%edx,%0                                              \n" "1:                                                                    \n" "        movl    %%edi,%%ebx\n": "=m"(features):

  :"%eax", "%ecx", "%edx", "%edi");

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

    __asm {

        xor eax, eax;

    Set up for CPUID instruction

            cpuid; Get and save vendor ID

            cmp eax, 1; Make sure 1 is valid input for CPUID

            jl done; We dont have the CPUID instruction

            xor eax, eax

            inc eax

            cpuid; Get family / model / stepping / features

            mov features, edx done:}

#elif defined(__sun) && (defined(__x86) || defined(__amd64))

    __asm

        ("        movl    %ebx,%edi\n"

         "        xorl    %eax,%eax         \n"

         "        cpuid                     \n"

         "        cmpl    $1,%eax           \n"

         "        jl      1f                \n"

         "        xorl    %eax,%eax         \n"

         "        incl    %eax              \n"

         "        cpuid                     \n"

#ifdef __i386

         "        movl    %edx,-8(%ebp)     \n"

#else

         "        movl    %edx,-8(%rbp)     \n"

#endif

         "1:                                \n"

         "        movl    %edi,%ebx\n");

#endif

    return features;

}

static __inline__ int

CPU_getCPUIDFeaturesExt(void)

{

    int features = 0;

#if defined(__GNUC__) && (defined(i386) || defined (__x86_64__) )

  __asm__("        movl    %%ebx,%%edi\n" "        movl    $0x80000000,%%eax   # Query for extended functions    \n" "        cpuid                       # Get extended function limit     \n" "        cmpl    $0x80000001,%%eax                                     \n" "        jl      1f                  # Nope, we dont have function 800000001h\n" "        movl    $0x80000001,%%eax   # Setup extended function 800000001h\n" "        cpuid                       # and get the information         \n" "        movl    %%edx,%0                                              \n" "1:                                                                    \n" "        movl    %%edi,%%ebx\n": "=m"(features):

  :"%eax", "%ecx", "%edx", "%edi");

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

    __asm {

        mov eax, 80000000 h;

        Query for extended functions

            cpuid; Get extended function limit

            cmp eax, 80000001 h jl done; Nope

            , we dont have function 800000001 h mov eax, 80000001 h;

        Setup extended function 800000001 h cpuid;

    and get the information mov features, edx done:}

#elif defined(__sun) && ( defined(__i386) || defined(__amd64) )

    __asm("        movl    %ebx,%edi\n"

          "        movl    $0x80000000,%eax \n"

          "        cpuid                    \n"

          "        cmpl    $0x80000001,%eax \n"

          "        jl      1f               \n"

          "        movl    $0x80000001,%eax \n"

          "        cpuid                    \n"

#ifdef __i386

          "        movl    %edx,-8(%ebp)   \n"

#else

          "        movl    %edx,-8(%rbp)   \n"

#endif

          "1:                               \n"

          "        movl    %edi,%ebx\n");

#endif

    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__)

    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 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;

}

SDL_bool

SDL_HasSSE(void)

{

    if (SDL_GetCPUFeatures() & CPU_HAS_SSE) {

        return SDL_TRUE;

    }

    return SDL_FALSE;

}

SDL_bool

SDL_HasSSE2(void)

{

    if (SDL_GetCPUFeatures() & CPU_HAS_SSE2) {

        return SDL_TRUE;

    }

    return SDL_FALSE;

}

SDL_bool

SDL_HasAltiVec(void)

{

    if (SDL_GetCPUFeatures() & CPU_HAS_ALTIVEC) {

        return SDL_TRUE;

    }

    return SDL_FALSE;

}

#ifdef TEST_MAIN

#include <stdio.h>

int

main()

{

    printf("RDTSC: %d\n", SDL_HasRDTSC());

    printf("MMX: %d\n", SDL_HasMMX());

    printf("MMXExt: %d\n", SDL_HasMMXExt());

    printf("3DNow: %d\n", SDL_Has3DNow());

    printf("3DNowExt: %d\n", SDL_Has3DNowExt());

    printf("SSE: %d\n", SDL_HasSSE());

    printf("SSE2: %d\n", SDL_HasSSE2());

    printf("AltiVec: %d\n", SDL_HasAltiVec());

    return 0;

}

#endif /* TEST_MAIN */

/* vi: set ts=4 sw=4 expandtab: */