minix/lib/i86/em/em_csb4.s

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2005-04-21 16:53:53 +02:00
.sect .text; .sect .rom; .sect .data; .sect .bss
.define .csb4
.sect .text
.csb4:
!bx: descriptor address
!ax, dx: index
push (bx) ! default
mov cx,2(bx) ! count (ignore high order word, the descriptor
! would not fit anyway)
1:
add bx,#6
dec cx
jl 4f
cmp ax,(bx)
jne 1b
cmp dx,2(bx)
jne 1b
pop bx
mov bx,4(bx)
2:
test bx,bx
jnz 3f
ECASE = 20
.extern .fat
mov ax,#ECASE
push ax
jmp .fat
3:
jmp (bx)
4:
pop bx
jmp 2b