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113 lines
2.6 KiB
ArmAsm
113 lines
2.6 KiB
ArmAsm
;
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; Ullrich von Bassewitz, 2002-12-20
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;
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; Common functions of the joystick API.
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;
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.export _joy_install, _joy_uninstall, _joy_masks
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.export joy_clear_ptr
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.importzp ptr1
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.include "joy-kernel.inc"
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.include "joy-error.inc"
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;----------------------------------------------------------------------------
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; Variables
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.bss
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_joy_drv: .res 2 ; Pointer to driver
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_joy_masks: .res JOY_MASK_COUNT
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; Jump table for the driver functions.
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.data
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joy_vectors:
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joy_install: jmp $0000
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joy_uninstall: jmp $0000
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joy_count: jmp $0000
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joy_read: jmp $0000
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; Driver header signature
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.rodata
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joy_sig: .byte $6A, $6F, $79, $00 ; "joy", version
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joy_sig_len = * - joy_sig
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;----------------------------------------------------------------------------
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; unsigned char __fastcall__ joy_install (void* driver);
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; /* Install the driver once it is loaded */
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_joy_install:
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sta _joy_drv
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sta ptr1
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stx _joy_drv+1
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stx ptr1+1
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; Check the driver signature
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ldy #joy_sig_len-1
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@L0: lda (ptr1),y
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cmp joy_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 mask array
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ldy #JOY_MASKS + JOY_MASK_COUNT - 1
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ldx #JOY_MASK_COUNT-1
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@L1: lda (ptr1),y
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sta _joy_masks,x
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dey
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dex
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bpl @L1
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; Copy the jump vectors
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ldy #JOY_HDR_JUMPTAB
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ldx #0
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@L2: 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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cpx #(JOY_HDR_JUMPCOUNT*3)
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bne @L2
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jmp joy_install ; Call driver install routine
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; Driver signature invalid
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inv_drv:
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lda #JOY_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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iny
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set: sta joy_vectors,x
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inx
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rts
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;----------------------------------------------------------------------------
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; unsigned char __fastcall__ joy_uninstall (void);
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; /* Uninstall the currently loaded driver. Note: This call does not free
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; * allocated memory.
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; */
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_joy_uninstall:
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jsr joy_uninstall ; Call the driver routine
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joy_clear_ptr: ; External entry point
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lda #0
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sta _joy_drv
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sta _joy_drv+1 ; Clear the driver pointer
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tax ; Return zero
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rts
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