Interpret some ARC firmware variables correctly. Patch from Guido

with some mods by me.

1 files changed, 50 insertions, 6 deletions

diff --git a/arch/mips64/arc/cmdline.c b/arch/mips64/arc/cmdline.c
index 8ab66fa59..2bc643d20 100644
--- a/arch/mips64/arc/cmdline.c
+++ b/arch/mips64/arc/cmdline.c
@@ -1,5 +1,4 @@
-/* $Id: cmdline.c,v 1.2 1999/10/19 20:51:44 ralf Exp $
- *
+/*
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
@@ -30,10 +29,49 @@ static char *ignored[] = {
 	"SystemPartition=",
 	"OSLoader=",
 	"OSLoadPartition=",
-	"OSLoadFilename="
+	"OSLoadFilename=",
+	"OSLoadOptions="
 };
 #define NENTS(foo) ((sizeof((foo)) / (sizeof((foo[0])))))
 
+static char *used_arc[][2] = {
+	{ "OSLoadPartition=", "root=" },
+	{ "OSLoadOptions=", "" }
+};
+
+static char * __init move_firmware_args(char* cp)
+{
+	char *s;
+	int actr, i;
+
+	actr = 1; /* Always ignore argv[0] */
+
+	while (actr < prom_argc) {
+		for(i = 0; i < NENTS(used_arc); i++) {
+			int len = strlen(used_arc[i][0]);
+
+			if (!strncmp(prom_argv(actr), used_arc[i][0], len)) {
+			/* Ok, we want it. First append the replacement... */
+				strcat(cp, used_arc[i][1]);
+				cp += strlen(used_arc[i][1]);
+				/* ... and now the argument */
+				s = strstr(prom_argv(actr), "=");
+				if (s) {
+					s++;
+					strcpy(cp, s);
+					cp += strlen(s);
+				}
+				*cp++ = ' ';
+				break;
+			}
+		}
+		actr++;
+	}
+
+	return cp;
+}
+
+
 void __init prom_init_cmdline(void)
 {
 	char *cp;
@@ -42,11 +80,17 @@ void __init prom_init_cmdline(void)
 	actr = 1; /* Always ignore argv[0] */
 
 	cp = &(arcs_cmdline[0]);
-	while(actr < prom_argc) {
-		for(i = 0; i < NENTS(ignored); i++) {
+	/* 
+	 * Move ARC variables to the beginning to make sure they can be
+	 * overridden by later arguments.
+	 */
+	cp = move_firmware_args(cp);
+
+	while (actr < prom_argc) {
+		for (i = 0; i < NENTS(ignored); i++) {
 			int len = strlen(ignored[i]);
 
-			if(!strncmp(prom_argv(actr), ignored[i], len))
+			if (!strncmp(prom_argv(actr), ignored[i], len))
 				goto pic_cont;
 		}
 		/* Ok, we want it. */