patch-1.3.4 linux/arch/sparc/prom/devmap.c

• Lines: 35
• Date: Mon Jun 5 11:16:47 1995
• Orig file: v1.3.3/linux/arch/sparc/prom/devmap.c
• Orig date: Thu Jan 1 02:00:00 1970

diff -u --recursive --new-file v1.3.3/linux/arch/sparc/prom/devmap.c linux/arch/sparc/prom/devmap.c
@@ -0,0 +1,34 @@
+/* promdevmap.c:  Map device/IO areas to virtual addresses.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ */
+
+#include <asm/openprom.h>
+#include <asm/oplib.h>
+
+/* Just like the routines in palloc.c, these should not be used
+ * by the kernel at all.  Bootloader facility mainly.  And again,
+ * this is only available on V2 proms and above.
+ */
+
+/* Map physical device address 'paddr' in IO space 'ios' of size
+ * 'num_bytes' to a virtual address, with 'vhint' being a hint to
+ * the prom as to where you would prefer the mapping.  We return
+ * where the prom actually mapped it.
+ */
+char *
+prom_mapio(char *vhint, int ios, unsigned int paddr, unsigned int num_bytes)
+{
+	if((num_bytes == 0) || (paddr == 0)) return (char *) 0x0;
+	return (*(romvec->pv_v2devops.v2_dumb_mmap))(vhint, ios, paddr,
+						     num_bytes);
+}
+
+/* Unmap an IO/device area that was mapped using the above routine. */
+void
+prom_unmapio(char *vaddr, unsigned int num_bytes)
+{
+	if(num_bytes == 0x0) return;
+	(*(romvec->pv_v2devops.v2_dumb_munmap))(vaddr, num_bytes);
+	return;
+}