[adm5120] refactor kernel code (part 1), mark it as broken now

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7916 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/adm5120-2.6/files/arch/mips/adm5120/prom/cfe.c

@@ -0,0 +1,86 @@
+/*
+ *  $Id$
+ *
+ *  Broadcom's CFE specific prom routines
+ *
+ *  Copyright (C) 2007 OpenWrt.org
+ *  Copyright (C) 2007 Gabor Juhos <juhosg@freemail.hu>
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the
+ *  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA  02110-1301, USA.
+ */
+
+#include <linux/types.h>
+#include <linux/init.h>
+
+#include <asm/bootinfo.h>
+#include <asm/addrspace.h>
+
+#include <prom/cfe.h>
+#include "prom_read.h"
+
+/*
+ * CFE based boards
+ */
+#define CFE_EPTSEAL	0x43464531 /* CFE1 is the magic number to recognize CFE
+from other bootloaders */
+
+static int cfe_found = 0;
+
+static u32 cfe_handle;
+static u32 cfe_entry;
+static u32 cfe_seal;
+
+int __init cfe_present(void)
+{
+	/*
+	 * This method only works, when we are booted directly from the CFE.
+	 */
+	u32 a1 = (u32) fw_arg1;
+
+	if (cfe_found)
+		return 1;
+
+	cfe_handle = (u32) fw_arg0;
+	cfe_entry = (u32) fw_arg2;
+	cfe_seal = (u32) fw_arg3;
+
+	/* Check for CFE by finding the CFE magic number */
+	if (cfe_seal != CFE_EPTSEAL) {
+		/* We are not booted from CFE */
+		return 0;
+	}
+
+	/* cfe_a1_val must be 0, because only one CPU present in the ADM5120 */
+	if (a1 != 0) {
+		return 0;
+	}
+
+	/* The cfe_handle, and the cfe_entry must be kernel mode addresses */
+	if ((cfe_handle < KSEG0) || (cfe_entry < KSEG0)) {
+		return 0;
+	}
+
+	cfe_found = 1;
+	return 1;
+}
+
+char *cfe_getenv(char *envname)
+{
+	if (cfe_found == 0)
+		return NULL;
+
+	return NULL;
+}