forked from KolibriOS/kolibrios
599 lines
12 KiB
C
599 lines
12 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 <string.h>
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#if defined(USE_ARM_SIMD) && defined(_MSC_VER)
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/* Needed for EXCEPTION_ILLEGAL_INSTRUCTION */
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#include <windows.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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static pixman_bool_t initialized = FALSE;
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static volatile pixman_bool_t have_vmx = TRUE;
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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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if (!initialized)
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{
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size_t length = sizeof(have_vmx);
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int error =
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sysctlbyname ("hw.optional.altivec", &have_vmx, &length, NULL, 0);
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if (error)
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have_vmx = FALSE;
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initialized = TRUE;
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}
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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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if (!initialized)
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{
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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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int error =
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sysctl (mib, 2, &have_vmx, &length, NULL, 0);
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if (error != 0)
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have_vmx = FALSE;
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initialized = TRUE;
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}
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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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if (!initialized)
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{
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char fname[64];
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unsigned long buf[64];
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ssize_t count = 0;
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pid_t pid;
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int fd, i;
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pid = getpid ();
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snprintf (fname, sizeof(fname) - 1, "/proc/%d/auxv", pid);
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fd = open (fname, O_RDONLY);
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if (fd >= 0)
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{
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for (i = 0; i <= (count / sizeof(unsigned long)); i += 2)
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{
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/* Read more if buf is empty... */
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if (i == (count / sizeof(unsigned long)))
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{
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count = read (fd, buf, sizeof(buf));
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if (count <= 0)
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break;
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i = 0;
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}
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if (buf[i] == AT_HWCAP)
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{
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have_vmx = !!(buf[i + 1] & PPC_FEATURE_HAS_ALTIVEC);
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initialized = TRUE;
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break;
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}
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else if (buf[i] == AT_NULL)
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{
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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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}
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if (!initialized)
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{
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/* Something went wrong. Assume 'no' rather than playing
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fragile tricks with catching SIGILL. */
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have_vmx = FALSE;
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initialized = TRUE;
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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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if (!initialized)
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{
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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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have_vmx = (jmp_result == 0);
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initialized = TRUE;
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}
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return have_vmx;
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}
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#endif /* __APPLE__ */
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#endif /* USE_VMX */
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#if defined(USE_ARM_SIMD) || defined(USE_ARM_NEON)
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#if defined(_MSC_VER)
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#if defined(USE_ARM_SIMD)
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extern int pixman_msvc_try_arm_simd_op ();
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pixman_bool_t
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pixman_have_arm_simd (void)
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{
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static pixman_bool_t initialized = FALSE;
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static pixman_bool_t have_arm_simd = FALSE;
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if (!initialized)
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{
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__try {
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pixman_msvc_try_arm_simd_op ();
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have_arm_simd = TRUE;
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} __except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION) {
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have_arm_simd = FALSE;
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}
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initialized = TRUE;
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}
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return have_arm_simd;
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}
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#endif /* USE_ARM_SIMD */
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#if defined(USE_ARM_NEON)
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extern int pixman_msvc_try_arm_neon_op ();
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pixman_bool_t
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pixman_have_arm_neon (void)
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{
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static pixman_bool_t initialized = FALSE;
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static pixman_bool_t have_arm_neon = FALSE;
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if (!initialized)
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{
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__try
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{
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pixman_msvc_try_arm_neon_op ();
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have_arm_neon = TRUE;
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}
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__except (GetExceptionCode () == EXCEPTION_ILLEGAL_INSTRUCTION)
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{
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have_arm_neon = FALSE;
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}
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initialized = TRUE;
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}
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return have_arm_neon;
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}
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#endif /* USE_ARM_NEON */
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#else /* linux ELF */
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <fcntl.h>
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#include <string.h>
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#include <elf.h>
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static pixman_bool_t arm_has_v7 = FALSE;
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static pixman_bool_t arm_has_v6 = FALSE;
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static pixman_bool_t arm_has_vfp = FALSE;
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static pixman_bool_t arm_has_neon = FALSE;
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static pixman_bool_t arm_has_iwmmxt = FALSE;
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static pixman_bool_t arm_tests_initialized = FALSE;
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static void
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pixman_arm_read_auxv ()
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{
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int fd;
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Elf32_auxv_t 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(Elf32_auxv_t)) == sizeof(Elf32_auxv_t))
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{
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if (aux.a_type == AT_HWCAP)
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{
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uint32_t hwcap = aux.a_un.a_val;
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/* hardcode these values to avoid depending on specific
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* versions of the hwcap header, e.g. HWCAP_NEON
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*/
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arm_has_vfp = (hwcap & 64) != 0;
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arm_has_iwmmxt = (hwcap & 512) != 0;
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/* this flag is only present on kernel 2.6.29 */
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arm_has_neon = (hwcap & 4096) != 0;
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}
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else if (aux.a_type == AT_PLATFORM)
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{
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const char *plat = (const char*) aux.a_un.a_val;
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if (strncmp (plat, "v7l", 3) == 0)
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{
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arm_has_v7 = TRUE;
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arm_has_v6 = TRUE;
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}
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else if (strncmp (plat, "v6l", 3) == 0)
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{
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arm_has_v6 = TRUE;
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}
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}
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}
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close (fd);
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}
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arm_tests_initialized = TRUE;
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}
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#if defined(USE_ARM_SIMD)
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pixman_bool_t
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pixman_have_arm_simd (void)
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{
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if (!arm_tests_initialized)
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pixman_arm_read_auxv ();
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return arm_has_v6;
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}
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#endif /* USE_ARM_SIMD */
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#if defined(USE_ARM_NEON)
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pixman_bool_t
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pixman_have_arm_neon (void)
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{
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if (!arm_tests_initialized)
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pixman_arm_read_auxv ();
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return arm_has_neon;
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}
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#endif /* USE_ARM_NEON */
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#endif /* linux */
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#endif /* USE_ARM_SIMD || USE_ARM_NEON */
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#if defined(USE_MMX) || defined(USE_SSE2)
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/* The CPU detection code needs to be in a file not compiled with
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* "-mmmx -msse", as gcc would generate CMOV instructions otherwise
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* that would lead to SIGILL instructions on old CPUs that don't have
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* it.
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*/
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#if !defined(__amd64__) && !defined(__x86_64__) && !defined(_M_AMD64)
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#ifdef HAVE_GETISAX
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#include <sys/auxv.h>
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#endif
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typedef enum
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{
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NO_FEATURES = 0,
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MMX = 0x1,
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MMX_EXTENSIONS = 0x2,
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SSE = 0x6,
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SSE2 = 0x8,
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CMOV = 0x10
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} cpu_features_t;
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static unsigned int
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detect_cpu_features (void)
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{
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unsigned int features = 0;
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unsigned int result = 0;
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#ifdef HAVE_GETISAX
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if (getisax (&result, 1))
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{
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if (result & AV_386_CMOV)
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features |= CMOV;
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if (result & AV_386_MMX)
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features |= MMX;
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if (result & AV_386_AMD_MMX)
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features |= MMX_EXTENSIONS;
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if (result & AV_386_SSE)
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features |= SSE;
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if (result & AV_386_SSE2)
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features |= SSE2;
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}
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#else
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char vendor[13];
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#ifdef _MSC_VER
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int vendor0 = 0, vendor1, vendor2;
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#endif
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vendor[0] = 0;
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vendor[12] = 0;
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#ifdef __GNUC__
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/* see p. 118 of amd64 instruction set manual Vol3 */
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/* We need to be careful about the handling of %ebx and
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* %esp here. We can't declare either one as clobbered
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* since they are special registers (%ebx is the "PIC
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* register" holding an offset to global data, %esp the
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* stack pointer), so we need to make sure they have their
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* original values when we access the output operands.
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*/
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__asm__ (
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"pushf\n"
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"pop %%eax\n"
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"mov %%eax, %%ecx\n"
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"xor $0x00200000, %%eax\n"
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"push %%eax\n"
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"popf\n"
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"pushf\n"
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"pop %%eax\n"
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"mov $0x0, %%edx\n"
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"xor %%ecx, %%eax\n"
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"jz 1f\n"
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"mov $0x00000000, %%eax\n"
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"push %%ebx\n"
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"cpuid\n"
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"mov %%ebx, %%eax\n"
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"pop %%ebx\n"
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"mov %%eax, %1\n"
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"mov %%edx, %2\n"
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"mov %%ecx, %3\n"
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"mov $0x00000001, %%eax\n"
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"push %%ebx\n"
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"cpuid\n"
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"pop %%ebx\n"
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"1:\n"
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"mov %%edx, %0\n"
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: "=r" (result),
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"=m" (vendor[0]),
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"=m" (vendor[4]),
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"=m" (vendor[8])
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:
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: "%eax", "%ecx", "%edx"
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);
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#elif defined (_MSC_VER)
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_asm {
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pushfd
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pop eax
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mov ecx, eax
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xor eax, 00200000h
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push eax
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popfd
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pushfd
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pop eax
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mov edx, 0
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xor eax, ecx
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jz nocpuid
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mov eax, 0
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push ebx
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cpuid
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mov eax, ebx
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pop ebx
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mov vendor0, eax
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mov vendor1, edx
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mov vendor2, ecx
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mov eax, 1
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push ebx
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cpuid
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pop ebx
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nocpuid:
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mov result, edx
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}
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memmove (vendor + 0, &vendor0, 4);
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memmove (vendor + 4, &vendor1, 4);
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memmove (vendor + 8, &vendor2, 4);
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#else
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# error unsupported compiler
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#endif
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features = 0;
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if (result)
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{
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/* result now contains the standard feature bits */
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if (result & (1 << 15))
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features |= CMOV;
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if (result & (1 << 23))
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features |= MMX;
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if (result & (1 << 25))
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features |= SSE;
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if (result & (1 << 26))
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features |= SSE2;
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if ((features & MMX) && !(features & SSE) &&
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(strcmp (vendor, "AuthenticAMD") == 0 ||
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strcmp (vendor, "Geode by NSC") == 0))
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{
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/* check for AMD MMX extensions */
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#ifdef __GNUC__
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__asm__ (
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" push %%ebx\n"
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" mov $0x80000000, %%eax\n"
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" cpuid\n"
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" xor %%edx, %%edx\n"
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" cmp $0x1, %%eax\n"
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" jge 2f\n"
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" mov $0x80000001, %%eax\n"
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" cpuid\n"
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"2:\n"
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" pop %%ebx\n"
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" mov %%edx, %0\n"
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: "=r" (result)
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:
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: "%eax", "%ecx", "%edx"
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);
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#elif defined _MSC_VER
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_asm {
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push ebx
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mov eax, 80000000h
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cpuid
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xor edx, edx
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cmp eax, 1
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jge notamd
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mov eax, 80000001h
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cpuid
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notamd:
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pop ebx
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mov result, edx
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}
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#endif
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if (result & (1 << 22))
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features |= MMX_EXTENSIONS;
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}
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}
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#endif /* HAVE_GETISAX */
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return features;
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}
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static pixman_bool_t
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pixman_have_mmx (void)
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{
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static pixman_bool_t initialized = FALSE;
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static pixman_bool_t mmx_present;
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if (!initialized)
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{
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unsigned int features = detect_cpu_features ();
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mmx_present = (features & (MMX | MMX_EXTENSIONS)) == (MMX | MMX_EXTENSIONS);
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initialized = TRUE;
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}
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return mmx_present;
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}
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#ifdef USE_SSE2
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static pixman_bool_t
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pixman_have_sse2 (void)
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{
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static pixman_bool_t initialized = FALSE;
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static pixman_bool_t sse2_present;
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if (!initialized)
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{
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unsigned int features = detect_cpu_features ();
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sse2_present = (features & (MMX | MMX_EXTENSIONS | SSE | SSE2)) == (MMX | MMX_EXTENSIONS | SSE | SSE2);
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initialized = TRUE;
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}
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return sse2_present;
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}
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#endif
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#else /* __amd64__ */
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#ifdef USE_MMX
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#define pixman_have_mmx() TRUE
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#endif
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#ifdef USE_SSE2
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#define pixman_have_sse2() TRUE
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#endif
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#endif /* __amd64__ */
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#endif
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pixman_implementation_t *
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_pixman_choose_implementation (void)
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{
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#ifdef USE_SSE2
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if (pixman_have_sse2 ())
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return _pixman_implementation_create_sse2 ();
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#endif
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#ifdef USE_MMX
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if (pixman_have_mmx ())
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return _pixman_implementation_create_mmx ();
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#endif
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#ifdef USE_ARM_NEON
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if (pixman_have_arm_neon ())
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return _pixman_implementation_create_arm_neon ();
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#endif
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#ifdef USE_ARM_SIMD
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if (pixman_have_arm_simd ())
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return _pixman_implementation_create_arm_simd ();
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#endif
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#ifdef USE_VMX
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if (pixman_have_vmx ())
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return _pixman_implementation_create_vmx ();
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#endif
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return _pixman_implementation_create_fast_path ();
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}
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