patch-2.2.8 linux/include/asm-m68k/page.h

• Lines: 24
• Date: Tue May 11 09:57:14 1999
• Orig file: v2.2.7/linux/include/asm-m68k/page.h
• Orig date: Wed Jan 20 23:14:06 1999

diff -u --recursive --new-file v2.2.7/linux/include/asm-m68k/page.h linux/include/asm-m68k/page.h
@@ -110,7 +110,22 @@
 /* This handles the memory map.. */
 #define PAGE_OFFSET		0
 #define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
-#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
+/*
+ * A hacky workaround for the problems with mmap() of frame buffer
+ * memory in the lower 16MB physical memoryspace.
+ *
+ * This is a short term solution, we will have to deal properly
+ * with this in 2.3.x.
+ */
+extern inline void *__va(unsigned long physaddr)
+{
+#ifdef CONFIG_AMIGA
+	if (MACH_IS_AMIGA && (physaddr < 16*1024*1024))
+		return (void *)0xffffffff;
+	else
+#endif
+		return (void *)(physaddr+PAGE_OFFSET);
+}
 #define MAP_NR(addr)		(__pa(addr) >> PAGE_SHIFT)
 
 #endif /* __KERNEL__ */