tyler.durden/kernel
1
0
Fork 0
mirror of https://github.com/FDOS/kernel.git synced 2025-04-08 17:15:17 +02:00
Code Issues Packages Projects Releases Wiki Activity

Some duplicate code merging and scancode-0xe0 related fixes.

Browse Source 
git-svn-id: https://svn.code.sf.net/p/freedos/svn/kernel/trunk@606 6ac86273-5f31-0410-b378-82cca8765d1b
This commit is contained in:
Bart Oldeman 2003-06-16 11:10:17 +00:00
parent 7bc5f8b31e
commit 1b2a421f44
1 changed files with 25 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

83
kernel/console.asm
View File

@ -41,7 +41,7 @@ ConTable db 0Ah
dw _IOCommandError
dw ConRead
dw CommonNdRdExit
dw ConInStat
dw CommonNdRdExit
dw ConInpFlush
dw ConWrite
dw ConWrite
@ -106,26 +106,16 @@ ConRead2:
jmp _IOExit
checkkey:
mov ah,1
add ah,[cs:kbdType]
int 16h ; Get status, if zf=0 al=char
jz keydone ; Jump if no char available
checke0: cmp al,0xe0 ; must check for 0xe0 scan code
jne .ret
cmp ax,0x00e0 ; check for Greek alpha
je .ret
mov al,0
.ret: retn
readkey:
mov ah,[cs:kbdType]
int 16h
jmp short checke0
keydone: pop cx
jmp _IODone
checke0: cmp al,0xe0 ; must check for 0xe0 scan code
jne .ret
or ah,ah ; check for Greek alpha
jz .ret
mov al,0 ; otherwise destroy the 0xe0
.ret: retn
;
; Name:
; KbdRdChar
@ -162,13 +152,27 @@ KbdRd1:
KbdRdRtn:
retn
;
; Name:
; ConInStat
;
; Function:
; Checks the keyboard input buffer.
;
; Description:
; Calls int 16 (get status). Sets Busy-Flag in status field. Destroys ax.
;
global CommonNdRdExit
CommonNdRdExit: ; *** tell if key waiting and return its ASCII if yes
mov al,[cs:uScanCode] ; Test for last scan code
; now AL is set if previous key was extended,
or al,al ; Was it zero ?
jnz ConNdRd2 ; Jump if there's a char waiting
call checkkey
mov ah,1
add ah,[cs:kbdType]
int 16h ; Get status, if zf=0 al=char
jz ConNdRd4 ; Jump if no char available
call checke0 ; check for e0 scancode
or ax,ax ; Zero ?
jnz ConNdRd1 ; Jump if not zero
call readkey
@ -183,6 +187,8 @@ ConNdRd1:
ConNdRd2:
lds bx,[cs:_ReqPktPtr] ; Set the status
cmp byte[bx+2],6 ; input status call?
je ConNdRd3
mov [bx+0Dh],al ; return the ASCII of that key
ConNdRd3:
@ -263,42 +269,3 @@ _int29_handler:
pop si
pop ax
iret
;
; Name:
; ConInStat
;
; Function:
; Checks the keybord input buffer.
;
; Description:
; Calls int 16 (get status). Sets Busy-Flag in status field. Destroys ax.
;
global ConInStat
ConInStat:
mov ah,0 ; just in case ...
mov al,[cs:uScanCode] ; Test for last scan code
or al,al ; Was it zero ?
jnz ConCharReady ; Jump if there's a char waiting
; return previously cached ext char if any
call checkkey
or ax,ax ; Zero ?
jnz ConIS1 ; Jump if not zero
; if non-zero key waiting, take it
call readkey
jmp short ConInStat
; if zero key was waiting, fetch 2nd part etc. (???)
ConIS1:
cmp ax,CTL_PRT_SCREEN ; Was ctl+prntscrn key pressed?
jne ConIS2 ; Jump if not
mov al,CTL_P
ConIS2:
lds bx,[cs:_ReqPktPtr] ; Set the status
mov [bx+0Dh],al ; return the ASCII of the key
ConCharReady:
jmp _IOExit ; key ready (busy=0)
ConNoChar:
jmp _IODone ; no key ready (busy=1)