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/*
* 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 (__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;
}
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