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Save option, rather than slice, selected. This permits unattended

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booting from other than drive 0, as the F5 keypress is saved and
"replayed."

Requested (some time ago) by: archie
This commit is contained in:
Robert Nordier 1999-03-01 02:42:47 +00:00
parent 303dec3b53
commit a3c69bbcf8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=44357
1 changed files with 26 additions and 18 deletions
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44
sys/boot/i386/boot0/boot0.s
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@ -13,7 +13,7 @@
# purpose.
#
# $Id: boot0.s,v 1.6 1998/12/05 11:58:33 rnordier Exp $
# $Id: boot0.s,v 1.7 1999/02/26 14:51:14 rnordier Exp $
# A 512-byte boot manager.
@ -68,8 +68,7 @@ main.0: movbr1(_dl,_FAKE,_bp_) # Save drive number
callwi(putn) # To new line
movwir(partbl,_bx) # Partition table
xorl %edx,%edx # Item
main.1: movbr0(_dh,_bx_) # Mark inactive
movb1r(0x4,_bx_,_al) # Load type
main.1: movb1r(0x4,_bx_,_al) # Load type
movwir(tables,_di) # Lookup tables
movb $TBL0SZ,%cl # Entries
repne # Exclude
@ -129,26 +128,35 @@ main.9: xorb %ah,%ah # BIOS: Get
main.10: cwtl # Option
btwr1(_ax,_MNUOPT,_bp_) # enabled?
jnc main.8 # No
movwir(FAKE,_si) # Partition entry
movb1r(_NXTDRV,_bp_,_dl) # Next drive
subb $'0',%dl # number
cmpb $0x4,%al # F5 pressed?
je main.11 # Yes
movb0r(_si_,_dl) # Drive number
movbr1(_al,_OPT,_bp_) # Save option
shlb $0x4,%al # Point to
addwia(partbl) # partition
xchgl %esi,%eax # entry
movwir(FAKE,_si) # Partition for write
movb0r(_si_,_dl) # Drive number
movl %esi,%ebx # Partition for read
cmpb $0x4,%al # F5 pressed?
pushfl # Save
je main.12 # Yes
movwir(partbl,_bx) # Partition table
pushl %ebx # Save
main.11: movbr0(_ah,_bx_) # Mark inactive
addb $0x10,%bl # To next entry
cmpb $0xfe,%bl # Till
jb main.11 # done
popl %ebx # Restore
shlb $0x4,%al # Selected
addb %al,%bl # partition
movbi0(0x80,_bx_) # Flag active
main.12: pushl %ebx # Save
tstbi1(0x40,_FLAGS,_bp_) # No updates?
jnz main.11 # Yes
movbi0(0x80,_si_) # Flag active
pushl %esi # Save
xchgl %esi,%eax # Fake partition entry
jnz main.13 # Yes
movwir(start,_bx) # Data to write
movwir(0x301,_ax) # Write sector
callwi(intx13) # to disk
popl %esi # Restore
main.11: movwir(LOAD,_bx) # Address for read
main.13: popl %esi # Restore
popfl # Restore
jne main.14 # If not F5
movb1r(_NXTDRV,_bp_,_dl) # Next drive
subb $'0',%dl # number
main.14: movwir(LOAD,_bx) # Address for read
movwir(0x201,_ax) # Read sector
callwi(intx13) # from disk
jc main.8 # If error