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114 lines
2.9 KiB
ArmAsm
114 lines
2.9 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 2003-12-28
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;
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; Common functions of the mouse driver API.
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;
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.import return0
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.importzp ptr1
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.condes mouse_irq, 2 ; Export as IRQ handler
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.include "mouse-kernel.inc"
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;----------------------------------------------------------------------------
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; Variables
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.bss
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_mouse_drv: .res 2 ; Pointer to driver
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; Jump table for the driver functions.
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.data
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mouse_vectors:
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mouse_install: jmp return0
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mouse_uninstall:jmp return0
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mouse_hide: jmp return0
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mouse_show: jmp return0
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mouse_box: jmp return0
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mouse_move: jmp return0
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mouse_buttons: jmp return0
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mouse_pos: jmp return0
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mouse_info: jmp return0
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mouse_ioctl: jmp return0
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mouse_irq: .byte $60, $00, $00 ; RTS plus two dummy bytes
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; Driver header signature
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.rodata
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mouse_sig: .byte $6d, $6f, $75, MOUSE_API_VERSION ; "mou", version
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;----------------------------------------------------------------------------
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; unsigned char __fastcall__ mouse_install (void* driver);
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; /* Install an already loaded driver. Returns an error code. */
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_mouse_install:
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sta _mouse_drv
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sta ptr1
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stx _mouse_drv+1
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stx ptr1+1
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; Check the driver signature
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ldy #.sizeof(mouse_sig)-1
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@L0: lda (ptr1),y
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cmp mouse_sig,y
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bne inv_drv
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dey
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bpl @L0
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; Copy the jump vectors
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ldy #MOUSE_HDR::JUMPTAB
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ldx #0
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@L1: inx ; Skip the JMP opcode
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jsr copy ; Copy one byte
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jsr copy ; Copy one byte
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cpy #(MOUSE_HDR::JUMPTAB + .sizeof(MOUSE_HDR::JUMPTAB))
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bne @L1
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jmp mouse_install ; Call driver install routine
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ldy mouse_irq+2 ; Check high byte of IRQ vector
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beq @L2 ; Jump if vector invalid
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ldy #$4C ; Jump opcode
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sty mouse_irq ; Activate IRQ routine
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@L2: rts
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; Driver signature invalid
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inv_drv:
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lda #MOUSE_ERR_INV_DRIVER
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ldx #0
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rts
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; Copy one byte from the jump vectors
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copy: lda (ptr1),y
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sta mouse_vectors,x
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iny
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inx
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rts
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;----------------------------------------------------------------------------
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; unsigned char __fastcall__ mouse_uninstall (void);
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; /* Uninstall the currently loaded driver. Returns an error code. */
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_mouse_uninstall:
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jsr mouse_uninstall ; Call driver routine
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lda #$60 ; RTS opcode
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sta mouse_irq ; Disable IRQ entry point
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mouse_clear_ptr: ; External entry point
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lda #0
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sta _mouse_drv
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sta _mouse_drv+1 ; Clear the driver pointer
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tax
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rts ; Return zero
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