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shave some bytes

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- setting of SS is not interruptible, so no need to guard it;
- direction flag is cleared by BIOS code, even on the XT.
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Peter Ferrie 2021-11-22 22:04:42 -08:00
parent 6000841378
commit d66e5d984f
2 changed files with 3 additions and 3 deletions
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sectorlisp.S
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@ -42,11 +42,11 @@ begin: xor %bx,%bx # we use the tiny memory model
push %cs # that's the bios load address
pop %es # therefore NULL points to NUL
push %cs # terminated NIL string above!
cli # disables hardware interrupts
#cli # disables hardware interrupts
pop %ss # disable nonmaskable ones too
mov %bx,%sp # use highest address as stack
sti # reenable hardware interrupts
cld # normalize the direction flag
#sti # reenable hardware interrupts
#cld # normalize the direction flag
inc %bx
inc %bx
main: mov $0x8000,%cx # dl (g_look) is zero or cr