patch-2.1.120 linux/include/asm-m68k/virtconvert.h

• Lines: 77
• Date: Wed Sep 2 09:39:18 1998
• Orig file: v2.1.119/linux/include/asm-m68k/virtconvert.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.119/linux/include/asm-m68k/virtconvert.h linux/include/asm-m68k/virtconvert.h
@@ -0,0 +1,76 @@
+#ifndef __VIRT_CONVERT__
+#define __VIRT_CONVERT__
+
+/*
+ * Macros used for converting between virtual and physical mappings.
+ */
+
+#ifdef __KERNEL__
+
+#include <linux/config.h>
+#include <asm/setup.h>
+
+#ifdef CONFIG_AMIGA
+#include <asm/amigahw.h>
+#endif
+
+/*
+ * Change virtual addresses to physical addresses and vv.
+ */
+extern unsigned long mm_vtop(unsigned long addr) __attribute__ ((const));
+extern unsigned long mm_vtop_fallback (unsigned long);
+extern unsigned long mm_ptov(unsigned long addr) __attribute__ ((const));
+
+#ifdef CONFIG_SINGLE_MEMORY_CHUNK
+extern inline unsigned long virt_to_phys(volatile void * address)
+{
+	unsigned long voff = (unsigned long) address;
+
+	if (voff < m68k_memory[0].size)
+		return m68k_memory[0].addr + voff;
+	else
+		return mm_vtop_fallback(voff);
+}
+
+extern inline void * phys_to_virt(unsigned long paddr)
+{
+	unsigned long base = m68k_memory[0].addr;
+
+	if ((paddr >=  base) && (paddr < (base + m68k_memory[0].size)))
+		return (void *)(paddr - base);
+#ifdef CONFIG_AMIGA
+	/*
+	 * if on an amiga and address is in first 16M, move it 
+	 * to the ZTWO_VADDR range
+	 */
+	if (MACH_IS_AMIGA && paddr < 16*1024*1024)
+		return (void *)ZTWO_VADDR(paddr);
+#endif
+	return (void *)paddr;
+}
+#else
+extern inline unsigned long virt_to_phys(volatile void * address)
+{
+	return mm_vtop((unsigned long)address);
+}
+
+extern inline void * phys_to_virt(unsigned long address)
+{
+	return (void *) mm_ptov(address);
+}
+#endif
+
+/*
+ * IO bus memory addresses are 1:1 with the physical address,
+ * except on the PCI bus of the Hades.
+ */
+#ifdef CONFIG_HADES
+#define virt_to_bus(a) (virt_to_phys(a) + (MACH_IS_HADES ? 0x80000000 : 0))
+#define bus_to_virt(a) (phys_to_virt((a) - (MACH_IS_HADES ? 0x80000000 : 0)))
+#else
+#define virt_to_bus virt_to_phys
+#define bus_to_virt phys_to_virt
+#endif
+
+#endif
+#endif