217 lines
4.1 KiB
NASM
217 lines
4.1 KiB
NASM
; kern_wasm.asm
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;
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; Open Watcom WASM/MASM-syntax port of the old TASM IDEAL kern.asm.
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; Intended for 16-bit DOS large memory model builds on Linux with Open Watcom v2.
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;
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; Keep kern.asm as the historical TASM source and use this file for the
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; reproducible Open Watcom build.
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.286
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.model large
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.data
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enterIPX dd 0
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.code
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public _IPXinit
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public _IPXopen_socket
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public _IPXclose_socket
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public _IPXlisten
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public _xmemmove
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public _Net_Call
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_IPXinit proc far
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push bp
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mov bp, sp
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push ds
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push si
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push di
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mov ax, 7A00h
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int 2Fh
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cmp al, 0FFh
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jne ipxinit_done
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mov cx, @data
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mov ds, cx
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mov word ptr enterIPX, di
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mov ax, es
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mov word ptr enterIPX+2, ax
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mov al, 1
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ipxinit_done:
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mov ah, 0
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pop di
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pop si
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pop ds
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pop bp
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ret
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_IPXinit endp
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_xmemmove proc far
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push bp
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mov bp, sp
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; far procedure stack layout, large model:
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; [bp+0] old bp
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; [bp+2] return offset
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; [bp+4] return segment
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; [bp+6] z offset
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; [bp+8] z segment
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; [bp+10] q offset
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; [bp+12] q segment
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; [bp+14] nmbr
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cli
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mov cx, [bp+14]
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or cx, cx
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jz xmem_done
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push ds
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push si
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push di
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pushf
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lds si, dword ptr [bp+10]
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les di, dword ptr [bp+6]
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cmp di, si
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jl xmem_forward
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std
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dec cx
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add di, cx
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add si, cx
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inc cx
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jmp xmem_copy
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xmem_forward:
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cld
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xmem_copy:
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rep movsb
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popf
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pop di
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pop si
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pop ds
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xmem_done:
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pop bp
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sti
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ret
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_xmemmove endp
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_IPXopen_socket proc far
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push bp
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mov bp, sp
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push ds
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push si
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push di
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; int IPXopen_socket(UI sock, int live)
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mov ax, [bp+8] ; live
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mov dx, [bp+6] ; sock
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mov bx, @data
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mov ds, bx
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mov bx, 0
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call dword ptr enterIPX
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cmp al, 0FFh
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jne ipxopen_not_already
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mov ax, -1 ; socket already open
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jmp ipxopen_done
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ipxopen_not_already:
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cmp al, 0FEh
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jne ipxopen_ok
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mov ax, -2 ; socket table full
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jmp ipxopen_done
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ipxopen_ok:
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mov ax, dx
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ipxopen_done:
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pop di
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pop si
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pop ds
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pop bp
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ret
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_IPXopen_socket endp
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_IPXclose_socket proc far
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push bp
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mov bp, sp
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push ds
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push si
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push di
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; void IPXclose_socket(UI sock)
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mov dx, [bp+6]
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mov bx, @data
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mov ds, bx
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mov bx, 1
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call dword ptr enterIPX
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pop di
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pop si
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pop ds
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pop bp
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ret
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_IPXclose_socket endp
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_IPXlisten proc far
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push bp
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mov bp, sp
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push ds
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push si
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push di
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; int IPXlisten(ECB *ecb)
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les si, dword ptr [bp+6]
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mov bx, @data
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mov ds, bx
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mov bx, 4
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call dword ptr enterIPX
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pop di
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pop si
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pop ds
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pop bp
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mov ah, 0
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ret
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_IPXlisten endp
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_Net_Call proc far
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push bp
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mov bp, sp
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; int Net_Call(UI func, void *req, void *repl)
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; [bp+6] func
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; [bp+8] req offset
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; [bp+10] req segment
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; [bp+12] repl offset
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; [bp+14] repl segment
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mov ax, [bp+6]
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push ds
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push si
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push di
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pushf
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lds si, dword ptr [bp+8]
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les di, dword ptr [bp+12]
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int 21h
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popf
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pop di
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pop si
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pop ds
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pop bp
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mov ah, 0
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ret
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_Net_Call endp
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end
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