mirror of
https://github.com/cc65/cc65.git
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d1a647b073
uninstalling the driver. git-svn-id: svn://svn.cc65.org/cc65/trunk@3761 b7a2c559-68d2-44c3-8de9-860c34a00d81
186 lines
5.2 KiB
ArmAsm
186 lines
5.2 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, popsreg, incsp2
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.importzp sreg, ptr1, tmp1, tmp2
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.interruptor mouse_irq ; 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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_mouse_hidden: .res 1 ; Mouse visibility flag
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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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mouse_flags: .byte $00
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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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.code
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;----------------------------------------------------------------------------
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; unsigned char __fastcall__ mouse_install (const struct mouse_callbacks* c,
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; 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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; Reset flags
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lda #1
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sta _mouse_hidden
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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 copyjv ; Copy one byte
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jsr copyjv ; 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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; Copy the flags byte. It is located directly behind the jump vectors, so Y
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; is already correct when we come here. To save code, we use copyjv - crude
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; but effective.
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jsr copyjv
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; Copy the callback vectors into the driver space
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jsr popsreg
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ldy #(MOUSE_HDR::CALLBACKS + .sizeof(MOUSE_HDR::CALLBACKS) - 1)
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sty tmp2
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ldy #.sizeof(MOUSE_CALLBACKS)-1
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sty tmp1
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@L2: jsr copycb
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ldy tmp1
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jsr copycb
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dec tmp2 ; Skip opcode byte
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ldy tmp1
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bpl @L2
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; Install the IRQ vector if the driver needs it
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bit mouse_flags ; Test MOUSE_FLAG_EARLY_IRQ
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bvc @L3 ; Jump if no interrupts at this time
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jsr install_irq ; Activate IRQ routine
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; Call driver install routine and check for errors
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@L3: jsr mouse_install
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tay ; Test error code
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bne uninstall_irq ; Jump on error
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; No errors on INSTALL. If the driver needs late IRQs, enable them now. Be
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; careful not to use A/X since these registers contain the error code from
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; INSTALL.
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bit mouse_flags ; Test MOUSE_FLAG_LATE_IRQ
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bpl Exit ; Jump if vector not needed
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install_irq:
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ldy #$4C ; Jump opcode
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sty mouse_irq ; Activate IRQ routine
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Exit: rts
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; Uninstall IRQ vector if install routine had errors. A/X may contain the
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; error code from mouse_install, so don't use it.
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uninstall_irq:
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ldy #$60 ; RTS opcode
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sty mouse_irq ; Disable IRQ entry point
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rts
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; Driver signature invalid. One word is still on the stack
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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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jmp incsp2
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; Copy one byte from the jump vectors
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copyjv: 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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; Copy one byte from the callback vectors
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copycb: lda (sreg),y
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dec tmp1
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ldy tmp2
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sta (ptr1),y
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dec tmp2
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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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; Depending on the late/early IRQ flag, we will disable IRQs before or after
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; calling the driver mouse_uninstall routine.
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bit mouse_flags ; Test MOUSE_FLAG_LATE_IRQ
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bpl @L1 ; Don't disable interrupts now
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jsr uninstall_irq ; Disable driver interrupts
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@L1: jsr mouse_uninstall ; Call driver routine
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; We don't check the flag a second time here, since disabling IRQs twice,
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; or disabling them if they weren't enabled will do no harm, and the missing
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; check will save a few bytes.
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jsr uninstall_irq ; Disable driver interrupts
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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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