/*

 * Copyright © 2000 SuSE, Inc.

 * Copyright © 2007 Red Hat, Inc.

 *

 * Permission to use, copy, modify, distribute, and sell this software and its

 * documentation for any purpose is hereby granted without fee, provided that

 * the above copyright notice appear in all copies and that both that

 * copyright notice and this permission notice appear in supporting

 * documentation, and that the name of SuSE not be used in advertising or

 * publicity pertaining to distribution of the software without specific,

 * written prior permission.  SuSE makes no representations about the

 * suitability of this software for any purpose.  It is provided "as is"

 * without express or implied warranty.

 *

 * SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE

 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION

 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN

 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

 */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include "pixman-private.h"

#ifdef USE_VMX

/* The CPU detection code needs to be in a file not compiled with

 * "-maltivec -mabi=altivec", as gcc would try to save vector register

 * across function calls causing SIGILL on cpus without Altivec/vmx.

 */

#ifdef __APPLE__

#include <sys/sysctl.h>

static pixman_bool_t

pixman_have_vmx (void)

{

    int error, have_vmx;

    size_t length = sizeof(have_vmx);

    error = sysctlbyname ("hw.optional.altivec", &have_vmx, &length, NULL, 0);

    if (error)

  return FALSE;

    return have_vmx;

}

#elif defined (__OpenBSD__)

#include <sys/param.h>

#include <sys/sysctl.h>

#include <machine/cpu.h>

static pixman_bool_t

pixman_have_vmx (void)

{

    int error, have_vmx;

    int mib[2] = { CTL_MACHDEP, CPU_ALTIVEC };

    size_t length = sizeof(have_vmx);

    error = sysctl (mib, 2, &have_vmx, &length, NULL, 0);

    if (error != 0)

  return FALSE;

    return have_vmx;

}

#elif defined (__FreeBSD__)

#include <machine/cpu.h>

#include <sys/auxv.h>

static pixman_bool_t

pixman_have_vmx (void)

{

    unsigned long cpufeatures;

    int have_vmx;

    if (elf_aux_info(AT_HWCAP, &cpufeatures, sizeof(cpufeatures)))

    return FALSE;

    have_vmx = cpufeatures & PPC_FEATURE_HAS_ALTIVEC;

    return have_vmx;

}

#elif defined (__linux__)

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <stdio.h>

#include <linux/auxvec.h>

#include <asm/cputable.h>

static pixman_bool_t

pixman_have_vmx (void)

{

    int have_vmx = FALSE;

    int fd;

    struct

    {

  unsigned long type;

  unsigned long value;

    } aux;

    fd = open ("/proc/self/auxv", O_RDONLY);

    if (fd >= 0)

    {

  while (read (fd, &aux, sizeof (aux)) == sizeof (aux))

  {

      if (aux.type == AT_HWCAP && (aux.value & PPC_FEATURE_HAS_ALTIVEC))

      {

    have_vmx = TRUE;

    break;

      }

  }

  close (fd);

    }

    return have_vmx;

}

#else /* !__APPLE__ && !__OpenBSD__ && !__linux__ */

#include <signal.h>

#include <setjmp.h>

static jmp_buf jump_env;

static void

vmx_test (int        sig,

    siginfo_t *si,

    void *     unused)

{

    longjmp (jump_env, 1);

}

static pixman_bool_t

pixman_have_vmx (void)

{

    struct sigaction sa, osa;

    int jmp_result;

    sa.sa_flags = SA_SIGINFO;

    sigemptyset (&sa.sa_mask);

    sa.sa_sigaction = vmx_test;

    sigaction (SIGILL, &sa, &osa);

    jmp_result = setjmp (jump_env);

    if (jmp_result == 0)

    {

  asm volatile ( "vor 0, 0, 0" );

    }

    sigaction (SIGILL, &osa, NULL);

    return (jmp_result == 0);

}

#endif /* __APPLE__ */

#endif /* USE_VMX */

pixman_implementation_t *

_pixman_ppc_get_implementations (pixman_implementation_t *imp)

{

#ifdef USE_VMX

    if (!_pixman_disabled ("vmx") && pixman_have_vmx ())

  imp = _pixman_implementation_create_vmx (imp);

#endif

    return imp;

}