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Serial code fixes from the FD1.0 kernel.

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git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@1302 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman 2006-10-31 21:01:38 +00:00
parent ba7bde0bdf
commit 4768a9d2f8
1 changed files with 19 additions and 7 deletions
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26
kernel/serial.asm
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@ -40,7 +40,7 @@ ComTable db 0Ah
dw _IOCommandError
dw ComRead
dw ComNdRead
dw _IOExit
dw ComInStat
dw ComInpFlush
dw ComWrite
dw ComWrite
@ -84,6 +84,18 @@ BiosRdRetn:
retn
ComInStat: ; similar to ComNdRead but returns no char, only flags
call GetComStat
mov al,[bx]
or al,al
jnz ComInAvail
call ComRdStatus
test ah,1 ; char waiting
jz ComNdRtn
; test al,20h ; DSR (why do we test this?)
; jz ComNdRtn
ComInAvail: jmp _IOExit ; return "ready"
ComNdRead:
call GetComStat
@ -91,17 +103,17 @@ ComNdRead:
or al,al
jnz ComNdRd1
call ComRdStatus
test ah,1
jz ComNdRtn
test al,20h
test ah,1 ; char waiting
jz ComNdRtn
; test al,20h ; DSR (why do we test this?)
; jz ComNdRtn
call BiosRdCom
call GetComStat
mov [bx],al
ComNdRd1:
jmp CommonNdRdExit
jmp CommonNdRdExit ; return that char
ComNdRtn:
jmp _IODone
jmp _IODone ; return "busy"
ComOutStat:
@ -110,7 +122,7 @@ ComOutStat:
jz ComNdRtn
test ah,20h
jz ComNdRtn
jmp _IOExit
jmp _IOExit ; return "ready"
ComRdStatus: