Hi!
8-Авг-2006 06:45 [EMAIL PROTECTED] (Michael Devore) wrote to
freedos-devel@lists.sourceforge.net:
>>So, BL should be modified only in case of error. Not a big deal, I suggest
MD> No, I think it is proper to ensure that BL should be set to a nonerror code
MD> condition. I won't change the existing code and I think the spec
MD> interpretation is sufficient to support that behavior.
I just review HIMEM source: there also cleared BL.
Interesting, that when I search "A20" through source, I found outdated
comment ("if someone ever decides to disable A20, EMM386 will crash nearly
immediately. so the code to disable A20 was disabled itself...") and
complete code duplication (proc disable_a20 is complete copy, except one
instruction, for disable_enable_a20).
(And small optimization:
mov ah,2
jmp short disable_enable_a20
disable_a20:
[...]
mov ah,0
disable_enable_a20:
[...]
mov al,0ddh ; or df=dd+2
or al,ah
may be replaced by:
mov ah,0dfh
jmp short disable_enable_a20
disable_a20:
[...]
mov ah,0ddh
disable_enable_a20:
[...]
mov al,ah
).
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