156 lines
3.6 KiB
C
156 lines
3.6 KiB
C
/*
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* Copyright © 2000 SuSE, Inc.
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* Copyright © 2007 Red Hat, Inc.
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of SuSE not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. SuSE makes no representations about the
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* suitability of this software for any purpose. It is provided "as is"
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* without express or implied warranty.
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*
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* SuSE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL SuSE
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* BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "pixman-private.h"
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#ifdef USE_VMX
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/* The CPU detection code needs to be in a file not compiled with
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* "-maltivec -mabi=altivec", as gcc would try to save vector register
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* across function calls causing SIGILL on cpus without Altivec/vmx.
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*/
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#ifdef __APPLE__
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#include <sys/sysctl.h>
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static pixman_bool_t
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pixman_have_vmx (void)
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{
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int error, have_vmx;
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size_t length = sizeof(have_vmx);
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error = sysctlbyname ("hw.optional.altivec", &have_vmx, &length, NULL, 0);
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if (error)
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return FALSE;
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return have_vmx;
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}
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#elif defined (__OpenBSD__)
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <machine/cpu.h>
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static pixman_bool_t
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pixman_have_vmx (void)
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{
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int error, have_vmx;
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int mib[2] = { CTL_MACHDEP, CPU_ALTIVEC };
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size_t length = sizeof(have_vmx);
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error = sysctl (mib, 2, &have_vmx, &length, NULL, 0);
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if (error != 0)
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return FALSE;
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return have_vmx;
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}
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#elif defined (__linux__)
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <linux/auxvec.h>
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#include <asm/cputable.h>
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static pixman_bool_t
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pixman_have_vmx (void)
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{
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int have_vmx = FALSE;
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int fd;
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struct
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{
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unsigned long type;
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unsigned long value;
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} aux;
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fd = open ("/proc/self/auxv", O_RDONLY);
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if (fd >= 0)
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{
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while (read (fd, &aux, sizeof (aux)) == sizeof (aux))
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{
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if (aux.type == AT_HWCAP && (aux.value & PPC_FEATURE_HAS_ALTIVEC))
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{
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have_vmx = TRUE;
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break;
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}
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}
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close (fd);
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}
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return have_vmx;
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}
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#else /* !__APPLE__ && !__OpenBSD__ && !__linux__ */
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#include <signal.h>
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#include <setjmp.h>
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static jmp_buf jump_env;
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static void
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vmx_test (int sig,
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siginfo_t *si,
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void * unused)
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{
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longjmp (jump_env, 1);
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}
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static pixman_bool_t
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pixman_have_vmx (void)
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{
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struct sigaction sa, osa;
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int jmp_result;
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sa.sa_flags = SA_SIGINFO;
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sigemptyset (&sa.sa_mask);
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sa.sa_sigaction = vmx_test;
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sigaction (SIGILL, &sa, &osa);
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jmp_result = setjmp (jump_env);
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if (jmp_result == 0)
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{
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asm volatile ( "vor 0, 0, 0" );
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}
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sigaction (SIGILL, &osa, NULL);
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return (jmp_result == 0);
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}
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#endif /* __APPLE__ */
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#endif /* USE_VMX */
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pixman_implementation_t *
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_pixman_ppc_get_implementations (pixman_implementation_t *imp)
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{
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#ifdef USE_VMX
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if (!_pixman_disabled ("vmx") && pixman_have_vmx ())
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imp = _pixman_implementation_create_vmx (imp);
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#endif
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return imp;
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}
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