Initial Revision

1 files changed, 124 insertions, 0 deletions

diff --git a/serverboot/translate_root.c b/serverboot/translate_root.c
new file mode 100644
index 00000000..b544d5c8
--- /dev/null
+++ b/serverboot/translate_root.c
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 1995 The University of Utah and
+ * the Computer Systems Laboratory at the University of Utah (CSL).
+ * All rights reserved.
+ *
+ * Permission to use, copy, modify and distribute this software is hereby
+ * granted provided that (1) source code retains these copyright, permission,
+ * and disclaimer notices, and (2) redistributions including binaries
+ * reproduce the notices in supporting documentation, and (3) all advertising
+ * materials mentioning features or use of this software display the following
+ * acknowledgement: ``This product includes software developed by the
+ * Computer Systems Laboratory at the University of Utah.''
+ *
+ * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS
+ * IS" CONDITION.  THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF
+ * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * CSL requests users of this software to return to csl-dist@cs.utah.edu any
+ * improvements that they make and grant CSL redistribution rights.
+ *
+ *      Author: Stephen Clawson, University of Utah CSL
+ */
+
+
+#include "translate_root.h"
+
+unsigned int atoh(ap)
+        char *ap;
+{
+        register char *p;
+        register unsigned int n;
+        register int digit,lcase;
+
+        p = ap;
+        n = 0;
+        while(*p == ' ')
+                p++;
+        while ((digit = (*p >= '0' && *p <= '9')) ||
+                (lcase = (*p >= 'a' && *p <= 'f')) ||
+                (*p >= 'A' && *p <= 'F')) {
+                n *= 16;
+                if (digit)      n += *p++ - '0';
+                else if (lcase) n += 10 + (*p++ - 'a');
+                else            n += 10 + (*p++ - 'A');
+        }
+        return(n);
+}
+
+/* 
+ * Translate the root device from whatever strange encoding we might
+ * be given.  Currently that includes BSD's slightly different name 
+ * for IDE devices, and Linux's device number encoding (since that's 
+ * what LILO passes us, for whatever reason).
+ */
+char *
+translate_root(root_string)
+        char *root_string;
+{
+	int linuxdev = atoh(root_string);
+
+	/* LILO passes us a string representing the linux device number of
+	 * our root device.  Since this is _not_ what we want, we'll make
+	 * a stab at converting it.
+	 *
+	 * Linux major numbers we care about:
+         *
+         * 2  = fd
+         * 3  = hd[ab]  (IDE channel 1)
+         * 8  = sd
+         * 22 = hd[cd]  (IDE channel 2)
+         *
+         */
+	if (linuxdev) {
+                if (LINUX_MAJOR(linuxdev) == 2) {
+                        root_string[0] = 'f';
+                        root_string[1] = 'd';
+                        root_string[2] = LINUX_FD_DEVICE_NR(linuxdev) + '0';
+                        root_string[3] = '\0';
+                } else {
+                        int shift;
+
+                        switch (LINUX_MAJOR(linuxdev)) {
+                        case 3:
+                        case 22:
+                                shift = 6;	
+                                root_string[0] = 'h';
+                                break;
+                        case 8:
+                                shift = 4;
+                                root_string[0] = 's';
+                                break;
+                        default:
+                                printf("Unknown linux device"
+				       "(major = %d, minor = %d) passed as "
+				       "root argument!\n"
+				       "using hd0a as default.\n",
+				       LINUX_MAJOR(linuxdev), 
+				       LINUX_MINOR(linuxdev));
+                                shift = 1;
+                                root_string[0] = 'h';
+                                linuxdev = 1;
+                        }
+
+                        root_string[1] = 'd';
+                        root_string[2] = LINUX_DEVICE_NR(linuxdev, shift)+'0';
+                        root_string[3] = LINUX_PARTN(linuxdev, shift)+'a' - 1;
+                        root_string[4] = '\0';
+                }
+	} else 
+		/* This could be handled much simpler in the BSD boot
+		 * adapter code, but baford insists that the boot
+		 * adapter code shouldn't be tainted by Mach's notion
+		 * of the `correct' device naming.  Thus, we get wdxx
+		 * instead of hdxx if booted from the BSD bootblocks,
+		 * and this is the lame hack that tries to convert it.
+		 */
+		if (root_string[0] == 'w' && root_string[1] == 'd')
+			root_string[0] = 'h';
+
+        return root_string;
+}
+
+
+