Index: arch/ppc64/loader/ofw.c
===================================================================
--- arch/ppc64/loader/ofw.c	(revision 89343aacc404c35fa2986daccaf859a148b89275)
+++ arch/ppc64/loader/ofw.c	(revision 89343aacc404c35fa2986daccaf859a148b89275)
@@ -0,0 +1,247 @@
+/*
+ * Copyright (C) 2005 Martin Decky
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+ 
+#include "ofw.h"
+#include "asm.h"
+#include "printf.h"
+
+#define MAX_OFW_ARGS	10
+#define BUF_SIZE		1024
+
+typedef unsigned int ofw_arg_t;
+typedef unsigned int ihandle;
+typedef unsigned int phandle;
+
+/** OpenFirmware command structure
+ *
+ */
+typedef struct {
+	const char *service;          /**< Command name */
+	unsigned int nargs;           /**< Number of in arguments */
+	unsigned int nret;            /**< Number of out arguments */
+	ofw_arg_t args[MAX_OFW_ARGS]; /**< List of arguments */
+} ofw_args_t;
+
+typedef void (*ofw_entry)(ofw_args_t *);
+
+
+ofw_entry ofw;
+
+phandle ofw_chosen;
+ihandle ofw_stdout;
+phandle ofw_root;
+ihandle ofw_mmu;
+phandle ofw_memory;
+phandle ofw_aliases;
+
+
+static int ofw_call(const char *service, const int nargs, const int nret, ofw_arg_t *rets, ...)
+{
+	va_list list;
+	ofw_args_t args;
+	int i;
+	
+	args.service = service;
+	args.nargs = nargs;
+	args.nret = nret;
+	
+	va_start(list, rets);
+	for (i = 0; i < nargs; i++)
+		args.args[i] = va_arg(list, ofw_arg_t);
+	va_end(list);
+	
+	for (i = 0; i < nret; i++)
+		args.args[i + nargs] = 0;
+	
+	ofw(&args);
+	
+	for (i = 1; i < nret; i++)
+		rets[i - 1] = args.args[i + nargs];
+	
+	return args.args[nargs];
+}
+
+
+static phandle ofw_find_device(const char *name)
+{
+	return ofw_call("finddevice", 1, 1, NULL, name);
+}
+
+
+static int ofw_get_property(const phandle device, const char *name, const void *buf, const int buflen)
+{
+	return ofw_call("getprop", 4, 1, NULL, device, name, buf, buflen);
+}
+
+
+static unsigned int ofw_get_address_cells(const phandle device)
+{
+	unsigned int ret;
+	
+	if (ofw_get_property(device, "#address-cells", &ret, sizeof(ret)) <= 0)
+		if (ofw_get_property(ofw_root, "#address-cells", &ret, sizeof(ret)) <= 0)
+			ret = 1;
+	
+	return ret;
+}
+
+
+static unsigned int ofw_get_size_cells(const phandle device)
+{
+	unsigned int ret;
+	
+	if (ofw_get_property(device, "#size-cells", &ret, sizeof(ret)) <= 0)
+		if (ofw_get_property(ofw_root, "#size-cells", &ret, sizeof(ret)) <= 0)
+			ret = 1;
+	
+	return ret;
+}
+
+
+static ihandle ofw_open(const char *name)
+{
+	return ofw_call("open", 1, 1, NULL, name);
+}
+
+
+void init(void)
+{
+	ofw_chosen = ofw_find_device("/chosen");
+	if (ofw_chosen == -1)
+		halt();
+	
+	if (ofw_get_property(ofw_chosen, "stdout",  &ofw_stdout, sizeof(ofw_stdout)) <= 0)
+		ofw_stdout = 0;
+	
+	ofw_root = ofw_find_device("/");
+	if (ofw_root == -1) {
+		puts("\r\nError: Unable to find / device, halted.\r\n");
+		halt();
+	}
+	
+	if (ofw_get_property(ofw_chosen, "mmu",  &ofw_mmu, sizeof(ofw_mmu)) <= 0) {
+		puts("\r\nError: Unable to get mmu property, halted.\r\n");
+		halt();
+	}
+	
+	ofw_memory = ofw_find_device("/memory");
+	if (ofw_memory == -1) {
+		puts("\r\nError: Unable to find /memory device, halted.\r\n");
+		halt();
+	}
+	
+	ofw_aliases = ofw_find_device("/aliases");
+	if (ofw_aliases == -1) {
+		puts("\r\nError: Unable to find /aliases device, halted.\r\n");
+		halt();
+	}
+}
+
+
+void ofw_write(const char *str, const int len)
+{
+	if (ofw_stdout == 0)
+		return;
+	
+	ofw_call("write", 3, 1, NULL, ofw_stdout, str, len);
+}
+
+
+void *ofw_translate(const void *virt)
+{
+	ofw_arg_t result[3];
+	
+	if (ofw_call("call-method", 4, 4, result, "translate", ofw_mmu, virt, 1) != 0) {
+		puts("Error: MMU method translate() failed, halting.\n");
+		halt();
+	}
+	return (void *) result[2];
+}
+
+
+int ofw_map(const void *phys, const void *virt, const int size, const int mode)
+{
+	return ofw_call("call-method", 6, 1, NULL, "map", ofw_mmu, mode, size, virt, phys);
+}
+
+
+int ofw_memmap(memmap_t *map)
+{
+	unsigned int buf[BUF_SIZE];
+	int ret = ofw_get_property(ofw_memory, "reg", buf, sizeof(unsigned int) * BUF_SIZE);
+	if (ret <= 0)
+		return false;
+		
+	unsigned int ac = ofw_get_address_cells(ofw_memory);
+	unsigned int sc = ofw_get_size_cells(ofw_memory);
+	
+	int pos;
+	map->total = 0;
+	map->count = 0;
+	for (pos = 0; (pos < ret / sizeof(unsigned int)) && (map->count < MEMMAP_MAX_RECORDS); pos += ac + sc) {
+		void * start = (void *) buf[pos + ac - 1];
+		unsigned int size = buf[pos + ac + sc - 1];
+		
+		if (size > 0) {
+			map->zones[map->count].start = start;
+			map->zones[map->count].size = size;
+			map->count++;
+			map->total += size;
+		}
+	}
+}
+
+
+int ofw_screen(screen_t *screen)
+{
+	char device_name[BUF_SIZE];
+	
+	if (ofw_get_property(ofw_aliases, "screen", device_name, sizeof(char) * BUF_SIZE) <= 0)
+		return false;
+	
+	phandle device = ofw_find_device(device_name);
+	if (device == -1)
+		return false;
+	
+	if (ofw_get_property(device, "address", &screen->addr, sizeof(screen->addr)) <= 0)
+		return false;
+	
+	if (ofw_get_property(device, "width", &screen->width, sizeof(screen->width)) <= 0)
+		return false;
+	
+	if (ofw_get_property(device, "height", &screen->height, sizeof(screen->height)) <= 0)
+		return false;
+	
+	if (ofw_get_property(device, "depth", &screen->bpp, sizeof(screen->bpp)) <= 0)
+		return false;
+	
+	if (ofw_get_property(device, "linebytes", &screen->scanline, sizeof(screen->scanline)) <= 0)
+		return false;
+	
+	return true;
+}
