moved veejay-devel to veejay-current (current branch re-opened)

git-svn-id: svn://code.dyne.org/veejay/trunk@510 eb8d1916-c9e9-0310-b8de-cf0c9472ead5
2025-12-24 00:30:01 +01:00 · 2006-01-20 16:44:05 +00:00
parent c84f6ca821
commit 146db20391
653 changed files with 0 additions and 0 deletions
--- a/veejay-current/utils/cpu_accel.c
+++ b/veejay-current/utils/cpu_accel.c
@@ -0,0 +1,161 @@
+/*
+ * cpu_accel.c
+ * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
+ *
+ * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
+ *
+ * mpeg2dec is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * mpeg2dec 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <signal.h>
+#include <setjmp.h>
+#include "cpu_accel.h"
+
+#ifdef HAVE_X86CPU 
+
+#include "mjpeg_types.h"
+
+/* Some miscelaneous stuff to allow checking whether SSE instructions cause
+   illegal instruction errors.
+*/
+
+static sigjmp_buf sigill_recover;
+
+static RETSIGTYPE sigillhandler(int sig )
+{
+	siglongjmp( sigill_recover, 1 );
+}
+
+typedef RETSIGTYPE (*__sig_t)(int);
+
+static int testsseill()
+{
+	int illegal;
+#if defined(__CYGWIN__)
+	/* SSE causes a crash on CYGWIN, apparently.
+	   Perhaps the wrong signal is being caught or something along
+	   those line ;-) or maybe SSE itself won't work...
+	*/
+	illegal = 1;
+#else
+	__sig_t old_handler = signal( SIGILL, sigillhandler);
+	if( sigsetjmp( sigill_recover, 1 ) == 0 )
+	{
+		asm ( "movups %xmm0, %xmm0" );
+		illegal = 0;
+	}
+	else
+		illegal = 1;
+	signal( SIGILL, old_handler );
+#endif
+	return illegal;
+}
+
+static int x86_accel (void)
+{
+    int32_t eax, ebx, ecx, edx;
+    int32_t AMD;
+    int32_t caps;
+
+#define cpuid(op,eax,ebx,ecx,edx)	\
+    asm ("cpuid"			\
+	 : "=a" (eax),			\
+	   "=b" (ebx),			\
+	   "=c" (ecx),			\
+	   "=d" (edx)			\
+	 : "a" (op)			\
+	 : "cc")
+
+    asm ("pushfl\n\t"
+	 "popl %0\n\t"
+	 "movl %0,%1\n\t"
+	 "xorl $0x200000,%0\n\t"
+	 "pushl %0\n\t"
+	 "popfl\n\t"
+	 "pushfl\n\t"
+	 "popl %0"
+         : "=a" (eax),
+	       "=b" (ebx)
+	 :
+	 : "cc");
+
+
+    if (eax == ebx)		// no cpuid
+	return 0;
+
+    cpuid (0x00000000, eax, ebx, ecx, edx);
+    if (!eax)			// vendor string only
+	return 0;
+
+    AMD = (ebx == 0x68747541) && (ecx == 0x444d4163) && (edx == 0x69746e65);
+
+    cpuid (0x00000001, eax, ebx, ecx, edx);
+    if (! (edx & 0x00800000))	// no MMX
+	return 0;
+
+    caps = ACCEL_X86_MMX;
+    /* If SSE capable CPU has same MMX extensions as AMD
+	   and then some. However, to use SSE O.S. must have signalled
+	   it use of FXSAVE/FXRSTOR through CR4.OSFXSR and hence FXSR (bit 24)
+	   here
+	*/
+    if ((edx & 0x02000000))	
+		caps = ACCEL_X86_MMX | ACCEL_X86_MMXEXT;
+	if( (edx & 0x03000000) == 0x03000000 )
+	{
+		/* Check whether O.S. has SSE support... has to be done with
+		   exception 'cos those Intel morons put the relevant bit
+		   in a reg that is only accesible in ring 0... doh! 
+		*/
+		if( !testsseill() )
+			caps |= ACCEL_X86_SSE;
+	}
+
+    cpuid (0x80000000, eax, ebx, ecx, edx);
+    if (eax < 0x80000001)	// no extended capabilities
+		return caps;
+
+    cpuid (0x80000001, eax, ebx, ecx, edx);
+
+    if (edx & 0x80000000)
+	caps |= ACCEL_X86_3DNOW;
+
+    if (AMD && (edx & 0x00400000))	// AMD MMX extensions
+	{
+		caps |= ACCEL_X86_MMXEXT;
+	}
+
+    return caps;
+}
+#endif
+
+int cpu_accel (void)
+{
+#ifdef HAVE_X86CPU 
+    static int got_accel = 0;
+    static int accel;
+
+    if (!got_accel) {
+	got_accel = 1;
+	accel = x86_accel ();
+    }
+
+    return accel;
+#else
+    return 0;
+#endif
+}