o kills one unneeded 'cld'
o kills 3 unneeded segreg prefixes
Yeah, picky. But I can be. It's asm.
I'm not sure if I used a virgin bootsect.S though, could somebody out
there test it for me? :)
This comes as a gift from AK's 360/720k bootsect patch, which as it stands
is a bit too untested for 2.3. But I'll post that next, as a separate
(read: DON'T APPLY THIS ONE ON TOP!) diff.
Chris Noe
(stiker@northlink.com)
--- bootsect.S.orig Sun Jan 30 21:41:45 2000
+++ bootsect.S Sun Jan 30 21:42:58 2000
@@ -106,9 +106,8 @@
pushw %ds
ldsw %fs:(%bx), %si # ds:si is source
movb $6, %cl # copy 12 bytes
- cld
pushw %di # di = 0x4000-12.
- rep
+ rep # don't need cld -> done on line 66
movsw
popw %di
popw %ds
@@ -140,20 +139,7 @@
jmp load_setup
ok_load_setup:
-# Get disk drive parameters, specifically nr of sectors/track.
-
-#if 0
-
-# bde - the Phoenix BIOS manual says function 0x08 only works for fixed
-# disks. It doesn't work for one of my BIOS's (1987 Award). It was
-# fatal not to check the error code.
-
- xorb %dl, %dl
- movb $0x08, %ah # AH=8 is get drive parameters
- int $0x13
- xorb %ch, %ch
-
-#else
+# Get disk drive parameters, specifically number of sectors/track.
# It seems that there is no BIOS call to get the number of sectors.
# Guess 36 sectors if sector 36 can be read, 18 sectors if sector 18
@@ -176,7 +162,6 @@
movw $0x0201, %ax # service 2, 1 sector
int $0x13
jc probe_loop # try next value
-#endif
got_sectors:
movw $INITSEG, %ax
@@ -200,11 +185,11 @@
# Otherwise, one of /dev/fd0H2880 (2,32) or /dev/PS0 (2,28) or /dev/at0 (2,8)
# depending on the number of sectors we pretend to know we have.
- movw %cs:root_dev, %ax
+ movw root_dev, %ax
orw %ax, %ax
jne root_defined
- movw %cs:sectors, %bx
+ movw sectors, %bx
movw $0x0208, %ax # /dev/ps0 - 1.2Mb
cmpw $15, %bx
je root_defined
@@ -219,7 +204,7 @@
movb $0, %al # /dev/fd0 - autodetect
root_defined:
- movw %ax, %cs:root_dev
+ movw %ax, root_dev
# After that (everything loaded), we jump to the setup-routine
# loaded directly after the bootblock:
-
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