Revert "alpha: kill xf86SlowBCopyToBus and xf86SlowBCopyFromBus"

The vesa driver still uses slowbcopy_frombus and slowbcopy_tobus.

This reverts commit 5ef53a94ce4e48e11de26290cd677266308640c8.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

4 files changed, 77 insertions, 9 deletions

diff --git a/hw/xfree86/common/compiler.h b/hw/xfree86/common/compiler.h
index cdb493a23..a450bd676 100644
--- a/hw/xfree86/common/compiler.h
+++ b/hw/xfree86/common/compiler.h
@@ -1211,6 +1211,8 @@ extern _X_EXPORT void (*xf86WriteMmio32)(int, void *, unsigned long);
 extern _X_EXPORT void (*xf86WriteMmioNB8)(int, void *, unsigned long);
 extern _X_EXPORT void (*xf86WriteMmioNB16)(int, void *, unsigned long);
 extern _X_EXPORT void (*xf86WriteMmioNB32)(int, void *, unsigned long);
+extern _X_EXPORT void xf86SlowBCopyFromBus(unsigned char *, unsigned char *, int);
+extern _X_EXPORT void xf86SlowBCopyToBus(unsigned char *, unsigned char *, int);
 
 /* Some macros to hide the system dependencies for MMIO accesses */
 /* Changed to kill noise generated by gcc's -Wcast-align */
@@ -1342,4 +1344,18 @@ extern _X_EXPORT void (*xf86WriteMmioNB32)(int, void *, unsigned long);
 #  define MMIO_MOVE32(base, offset, val) MMIO_OUT32(base, offset, val)
 
 # endif /* __alpha__ */
+
+/*
+ * With Intel, the version in os-support/misc/SlowBcopy.s is used.
+ * This avoids port I/O during the copy (which causes problems with
+ * some hardware).
+ */
+# ifdef __alpha__
+#  define slowbcopy_tobus(src,dst,count) xf86SlowBCopyToBus(src,dst,count)
+#  define slowbcopy_frombus(src,dst,count) xf86SlowBCopyFromBus(src,dst,count)
+# else /* __alpha__ */
+#  define slowbcopy_tobus(src,dst,count) xf86SlowBcopy(src,dst,count)
+#  define slowbcopy_frombus(src,dst,count) xf86SlowBcopy(src,dst,count)
+# endif /* __alpha__ */
+
 #endif /* _COMPILER_H */
diff --git a/hw/xfree86/os-support/misc/SlowBcopy.c b/hw/xfree86/os-support/misc/SlowBcopy.c
index 8a5017e52..182a3e6ec 100644
--- a/hw/xfree86/os-support/misc/SlowBcopy.c
+++ b/hw/xfree86/os-support/misc/SlowBcopy.c
@@ -1,8 +1,15 @@
+/*******************************************************************************
+  for Alpha Linux
+*******************************************************************************/
+ 
 /* 
  *   Create a dependency that should be immune from the effect of register
  *   renaming as is commonly seen in superscalar processors.  This should
  *   insert a minimum of 100-ns delays between reads/writes at clock rates
  *   up to 100 MHz---GGL
+ *   
+ *   Slowbcopy(char *src, char *dst, int count)   
+ *   
  */ 
 
 #ifdef HAVE_XORG_CONFIG_H
@@ -47,3 +54,48 @@ xf86SlowBcopy(unsigned char *src, unsigned char *dst, int len)
     while(len--)
 	*dst++ = *src++;
 }
+
+#ifdef __alpha__
+
+#ifdef linux
+
+#define SPARSE (7)
+
+#else
+
+#define SPARSE 0
+
+#endif
+
+void
+xf86SlowBCopyFromBus(unsigned char *src, unsigned char *dst, int count)
+{
+    unsigned long addr;
+    long result;
+
+    addr = (unsigned long) src;
+    while( count ){
+	result = *(volatile int *) addr;
+	result >>= ((addr>>SPARSE) & 3) * 8;
+	*dst++ = (unsigned char) (0xffUL & result);
+	addr += 1<<SPARSE;
+	count--;
+	outb(0x80, 0x00);
+    }
+}
+  
+void
+xf86SlowBCopyToBus(unsigned char *src, unsigned char *dst, int count)
+{
+    unsigned long addr;
+
+    addr = (unsigned long) dst;
+    while(count) {
+	*(volatile unsigned int *) addr = (unsigned short)(*src) * 0x01010101;
+	src++;
+	addr += 1<<SPARSE;
+	count--;
+	outb(0x80, 0x00);
+    }
+}
+#endif
diff --git a/hw/xfree86/os-support/shared/bios_mmap.c b/hw/xfree86/os-support/shared/bios_mmap.c
index a615a1d45..40afd5b8e 100644
--- a/hw/xfree86/os-support/shared/bios_mmap.c
+++ b/hw/xfree86/os-support/shared/bios_mmap.c
@@ -131,7 +131,7 @@ xf86ReadBIOS(unsigned long Base, unsigned long Offset, unsigned char *Buf,
 		return(-1);
 	}
 
-	xf86SlowBcopy((unsigned char *)(base+Offset), Buf, Len);
+	xf86SlowBCopyFromBus((unsigned char *)(base+Offset), Buf, Len);
 
 	munmap((caddr_t)base, mlen);
 	close(fd);
diff --git a/hw/xfree86/vgahw/vgaHW.c b/hw/xfree86/vgahw/vgaHW.c
index 025dde2da..004376b75 100644
--- a/hw/xfree86/vgahw/vgaHW.c
+++ b/hw/xfree86/vgahw/vgaHW.c
@@ -793,7 +793,7 @@ vgaHWRestoreFonts(ScrnInfoPtr scrninfp, vgaRegPtr restore)
     if (hwp->FontInfo1) {
 	hwp->writeSeq(hwp, 0x02, 0x04);	/* write to plane 2 */
 	hwp->writeGr(hwp, 0x04, 0x02);	/* read plane 2 */
-	xf86SlowBcopy(hwp->FontInfo1, hwp->Base, FONT_AMOUNT);
+	slowbcopy_tobus(hwp->FontInfo1, hwp->Base, FONT_AMOUNT);
     }
 #endif
 
@@ -801,7 +801,7 @@ vgaHWRestoreFonts(ScrnInfoPtr scrninfp, vgaRegPtr restore)
     if (hwp->FontInfo2) {
 	hwp->writeSeq(hwp, 0x02, 0x08);	/* write to plane 3 */
 	hwp->writeGr(hwp, 0x04, 0x03);	/* read plane 3 */
-	xf86SlowBcopy(hwp->FontInfo2, hwp->Base, FONT_AMOUNT);
+	slowbcopy_tobus(hwp->FontInfo2, hwp->Base, FONT_AMOUNT);
     }
 #endif
 
@@ -809,10 +809,10 @@ vgaHWRestoreFonts(ScrnInfoPtr scrninfp, vgaRegPtr restore)
     if (hwp->TextInfo) {
 	hwp->writeSeq(hwp, 0x02, 0x01);	/* write to plane 0 */
 	hwp->writeGr(hwp, 0x04, 0x00);	/* read plane 0 */
-	xf86SlowBcopy(hwp->TextInfo, hwp->Base, TEXT_AMOUNT);
+	slowbcopy_tobus(hwp->TextInfo, hwp->Base, TEXT_AMOUNT);
 	hwp->writeSeq(hwp, 0x02, 0x02);	/* write to plane 1 */
 	hwp->writeGr(hwp, 0x04, 0x01);	/* read plane 1 */
-	xf86SlowBcopy((unsigned char *)hwp->TextInfo + TEXT_AMOUNT,
+	slowbcopy_tobus((unsigned char *)hwp->TextInfo + TEXT_AMOUNT,
 			hwp->Base, TEXT_AMOUNT);
     }
 #endif
@@ -971,24 +971,24 @@ vgaHWSaveFonts(ScrnInfoPtr scrninfp, vgaRegPtr save)
     if (hwp->FontInfo1 || (hwp->FontInfo1 = xalloc(FONT_AMOUNT))) {
 	hwp->writeSeq(hwp, 0x02, 0x04);	/* write to plane 2 */
 	hwp->writeGr(hwp, 0x04, 0x02);	/* read plane 2 */
-	xf86SlowBcopy(hwp->Base, hwp->FontInfo1, FONT_AMOUNT);
+	slowbcopy_frombus(hwp->Base, hwp->FontInfo1, FONT_AMOUNT);
     }
 #endif /* SAVE_FONT1 */
 #if SAVE_FONT2
     if (hwp->FontInfo2 || (hwp->FontInfo2 = xalloc(FONT_AMOUNT))) {
 	hwp->writeSeq(hwp, 0x02, 0x08);	/* write to plane 3 */
 	hwp->writeGr(hwp, 0x04, 0x03);	/* read plane 3 */
-	xf86SlowBcopy(hwp->Base, hwp->FontInfo2, FONT_AMOUNT);
+	slowbcopy_frombus(hwp->Base, hwp->FontInfo2, FONT_AMOUNT);
     }
 #endif /* SAVE_FONT2 */
 #if SAVE_TEXT
     if (hwp->TextInfo || (hwp->TextInfo = xalloc(2 * TEXT_AMOUNT))) {
 	hwp->writeSeq(hwp, 0x02, 0x01);	/* write to plane 0 */
 	hwp->writeGr(hwp, 0x04, 0x00);	/* read plane 0 */
-	xf86SlowBcopy(hwp->Base, hwp->TextInfo, TEXT_AMOUNT);
+	slowbcopy_frombus(hwp->Base, hwp->TextInfo, TEXT_AMOUNT);
 	hwp->writeSeq(hwp, 0x02, 0x02);	/* write to plane 1 */
 	hwp->writeGr(hwp, 0x04, 0x01);	/* read plane 1 */
-	xf86SlowBcopy(hwp->Base,
+	slowbcopy_frombus(hwp->Base,
 		(unsigned char *)hwp->TextInfo + TEXT_AMOUNT, TEXT_AMOUNT);
     }
 #endif /* SAVE_TEXT */