source: trunk/minix/lib/i86/rts/_sendrec.s@ 12

.define __send, __receive, __sendrec

! See ../h/com.h for C definitions
SEND = 1
RECEIVE = 2
BOTH = 3
SYSVEC = 32

!*========================================================================*
!                           _send and _receive                            *
!*========================================================================*
! _send(), _receive(), _sendrec() all save bp, but destroy ax, bx, and cx.
.extern __send, __receive, __sendrec
__send: mov cx,*SEND            ! _send(dest, ptr)
        jmp L0

__receive:
        mov cx,*RECEIVE         ! _receive(src, ptr)
        jmp L0

__sendrec:
        mov cx,*BOTH            ! _sendrec(srcdest, ptr)
        jmp L0

  L0:   push bp                 ! save bp
        mov bp,sp               ! can't index off sp
        mov ax,4(bp)            ! ax = dest-src
        mov bx,6(bp)            ! bx = message pointer
        int SYSVEC              ! trap to the kernel
        pop bp                  ! restore bp
        ret                     ! return