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Do install-time configuration of the i386 boot0 boot manager. At

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present, this is limited to turning on the packet option if any of
disk slices begin above cylinder 1023.  The effect of this change
should therefore be to automatically enable LBA support, as needed,
when installing FreeBSD.

Something-of-the-kind-requested-by: peter
This commit is contained in:
Robert Nordier 2000-12-12 17:25:06 +00:00
parent 5057d21069
commit f0da1b03a0
1 changed files with 23 additions and 1 deletions
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24
lib/libdisk/write_disk.c
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@ -163,6 +163,22 @@ Write_Int32(u_int32_t *p, u_int32_t v)
bp[2] = (v >> 16) & 0xff;
bp[3] = (v >> 24) & 0xff;
}
#ifndef __alpha__
/*
* Special install-time configuration for the i386 boot0 boot manager.
*/
static void
Cfg_Boot_Mgr(u_char *mbr, int edd)
{
if (mbr[0x1b0] == 0x66 && mbr[0x1b1] == 0xbb) {
if (edd)
mbr[0x1bb] |= 0x80; /* Packet mode on */
else
mbr[0x1bb] &= 0x7f; /* Packet mode off */
}
}
#endif
#endif
int
@ -180,6 +196,9 @@ Write_Disk(struct disk *d1)
int PC98_EntireDisk = 0;
#else
int s[4];
#ifndef __alpha__
int need_edd = 0; /* Need EDD (packet interface) */
#endif
#endif
int one = 1;
int zero = 0;
@ -255,6 +274,7 @@ Write_Disk(struct disk *d1)
dp[j].dp_ssect = 0xff;
dp[j].dp_shd = 0xff;
dp[j].dp_scyl = 0xff;
need_edd++;
} else {
dp[j].dp_ssect = i % d1->bios_sect;
i -= dp[j].dp_ssect++;
@ -357,8 +377,10 @@ Write_Disk(struct disk *d1)
write_block(fd,WHERE(2+i,d1),&d1->bootmenu[i * 512]);
#else
mbr = read_block(fd,WHERE(0,d1));
if (d1->bootmgr)
if (d1->bootmgr) {
memcpy(mbr,d1->bootmgr,DOSPARTOFF);
Cfg_Boot_Mgr(mbr, need_edd);
}
memcpy(mbr+DOSPARTOFF,dp,sizeof *dp * NDOSPART);
mbr[512-2] = 0x55;
mbr[512-1] = 0xaa;