From 9625f6d328d6f516520930227b218979309938bc Mon Sep 17 00:00:00 2001
From: Matt Turner <mattst88@gmail.com>
Date: Tue, 6 Oct 2009 20:58:30 -0400
Subject: [PATCH] Fix breakage on alpha caused by c7680befe5ae

Pinpointed by by Michael Cree.

Commit c7680befe5ae removed Jensen support, but at the same time broke
support for dense memory systems.

Signed-off-by: Matt Turner <mattst88@gmail.com>
---
 hw/xfree86/os-support/misc/SlowBcopy.c | 58 ++++++++++++++++----------
 1 file changed, 37 insertions(+), 21 deletions(-)

diff --git a/hw/xfree86/os-support/misc/SlowBcopy.c b/hw/xfree86/os-support/misc/SlowBcopy.c
index 182a3e6ec..0021b5544 100644
--- a/hw/xfree86/os-support/misc/SlowBcopy.c
+++ b/hw/xfree86/os-support/misc/SlowBcopy.c
@@ -59,10 +59,16 @@ xf86SlowBcopy(unsigned char *src, unsigned char *dst, int len)
 
 #ifdef linux
 
+unsigned long _bus_base(void);
+
+#define useSparse() (!_bus_base())
+
 #define SPARSE (7)
 
 #else
 
+#define useSparse() 0
+
 #define SPARSE 0
 
 #endif
@@ -70,32 +76,42 @@ xf86SlowBcopy(unsigned char *src, unsigned char *dst, int len)
 void
 xf86SlowBCopyFromBus(unsigned char *src, unsigned char *dst, int count)
 {
-    unsigned long addr;
-    long result;
+	if (useSparse())
+	{
+		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);
-    }
+		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);
+		}
+	}
+	else
+		xf86SlowBcopy(src, dst, count);
 }
-  
+
 void
 xf86SlowBCopyToBus(unsigned char *src, unsigned char *dst, int count)
 {
-    unsigned long addr;
+	if (useSparse())
+	{
+		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);
-    }
+		addr = (unsigned long) dst;
+		while (count) {
+			*(volatile unsigned int *) addr = (unsigned short)(*src) * 0x01010101;
+			src++;
+			addr += 1<<SPARSE;
+			count--;
+			outb(0x80, 0x00);
+		}
+	}
+	else
+		xf86SlowBcopy(src, dst, count);
 }
 #endif