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Added better chainloading support.

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This commit is contained in:
erich 1996-10-06 03:14:06 +00:00
parent b5cfb73063
commit 9e5921e84c
1 changed files with 14 additions and 5 deletions
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19
shared_src/disk_io.c
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@ -361,6 +361,8 @@ check_BSD_parts(int flags)
}
static char cur_part_desc[16];
static int
real_open_partition(int flags)
{
@ -423,6 +425,7 @@ real_open_partition(int flags)
current_slice = PC_SLICE_TYPE(mbr_buf, i);
part_start = part_offset + PC_SLICE_START(mbr_buf, i);
part_length = PC_SLICE_LENGTH(mbr_buf, i);
bcopy(mbr_buf+PC_SLICE_OFFSET+(i<<4), cur_part_desc, 16);
/*
* Is this PC partition entry valid?
@ -660,22 +663,28 @@ open_device(void)
#ifndef NO_FANCY_STUFF
int
bsd_bootdev(void)
set_bootdev(void)
{
int i, j;
/*
* Set chainloader boot device.
*/
bcopy(cur_part_desc, (char *)(BOOTSEC_LOCATION-16), 16);
/*
* Set BSD boot device.
*/
i = (saved_partition >> 16) + 2;
if (saved_partition == 0xFFFFFF)
i = 1;
else if ((saved_partition >> 16) == 0xFF)
i = 0;
else
i = (saved_partition >> 16) + 2;
/* XXX extremely evil hack!!! */
j = 2;
if (saved_drive & 0x80)
j = bsd_evil_hack;
else
j = 2;
return MAKEBOOTDEV( j, (i >> 4), (i & 0xF), (saved_drive & 0x79),
((saved_partition >> 8) & 0xFF) );