1 files changed, 58 insertions, 0 deletions
diff --git a/i386/i386/io_map.c b/i386/i386/io_map.c
new file mode 100644
index 00000000..256a9a08
--- /dev/null
+++ b/i386/i386/io_map.c
@@ -0,0 +1,58 @@
+/* 
+ * Mach Operating System
+ * Copyright (c) 1991,1990 Carnegie Mellon University
+ * All Rights Reserved.
+ * 
+ * Permission to use, copy, modify and distribute this software and its
+ * documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ * 
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
+ * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ * 
+ * Carnegie Mellon requests users of this software to return to
+ * 
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ * 
+ * any improvements or extensions that they make and grant Carnegie Mellon
+ * the rights to redistribute these changes.
+ */
+
+#include <mach/vm_param.h>
+#include <vm/vm_kern.h>
+#include <vm/vm_map.h>
+
+extern vm_offset_t kernel_virtual_start;
+
+/*
+ * Allocate and map memory for devices that may need to be mapped before
+ * Mach VM is running.
+ */
+vm_offset_t
+io_map(phys_addr, size)
+	vm_offset_t	phys_addr;
+	vm_size_t	size;
+{
+	vm_offset_t	start;
+
+	if (kernel_map == VM_MAP_NULL) {
+	    /*
+	     * VM is not initialized.  Grab memory.
+	     */
+	    start = kernel_virtual_start;
+	    kernel_virtual_start += round_page(size);
+	    printf("stealing kernel virtual addresses %08x-%08x\n", start, kernel_virtual_start);
+	}
+	else {
+	    (void) kmem_alloc_pageable(kernel_map, &start, round_page(size));
+	}
+	(void) pmap_map_bd(start, phys_addr, phys_addr + round_page(size),
+			VM_PROT_READ|VM_PROT_WRITE);
+	return (start);
+}