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/*
* 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;
}
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