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jsrfar.inc
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;*******************************************************************************
;Copyright 2022-2024, Stefan Jakobsson
;
;Redistribution and use in source and binary forms, with or without modification,
;are permitted provided that the following conditions are met:
;
;1. Redistributions of source code must retain the above copyright notice, this
; list of conditions and the following disclaimer.
;
;2. Redistributions in binary form must reproduce the above copyright notice,
; this list of conditions and the following disclaimer in the documentation
; and/or other materials provided with the distribution.
;
;THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
;AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
;IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
;DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
;FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
;SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
;CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
;OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
;OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;*******************************************************************************
jmpfr = $02df
jsrfar3 = $02c4
.segment "VARS"
jsrfar_addr: .res 2
jsrfar_bank: .res 1
.CODE
;******************************************************************************
;Function name.......: jsrfar1
;Purpose.............: General JSRFAR util that may call code in any ROM
; bank from the editor's first ROM bank
;Input...............: Store target address and bank in jsrfar_addr and
; jsrfar_bank
;Returns.............: Result of the far code that was called
;Error returns.......: None
.proc jsrfar1
;Reserve 1 extra byte on the stack, used to store current ROM bank
pha
;Save input values
php
pha
phx
;Get stack pointer
tsx
;Set call address
lda jsrfar_addr
sta jmpfr+1
lda jsrfar_addr+1
sta jmpfr+2
;Save current bank on stack in extra byte
lda ROM_SEL
sta $0104,x
;Restore X
plx
;Select Kernal ROM bank
lda jsrfar_bank
;Jump to Kernal function
jmp jsrfar3
exit:
rts
.endproc
;******************************************************************************
;Function name.......: jsrfar2
;Purpose.............: General JSRFAR util that may call code in any ROM
; bank from the editor's second ROM bank
;Input...............: Store target address and bank in jsrfar_addr and
; jsrfar_bank
;Returns.............: Result of the far code that was called
;Error returns.......: None
.segment "CODE2"
.proc jsrfar2
;Reserve 1 extra byte on the stack, used to store current ROM bank
pha
;Save input values
php
pha
phx
;Get stack pointer
tsx
;Set call address
lda jsrfar_addr
sta jmpfr+1
lda jsrfar_addr+1
sta jmpfr+2
;Save current bank on stack in extra byte
lda ROM_SEL
sta $0104,x
;Restore X
plx
;Select Kernal ROM bank
lda jsrfar_bank
;Jump to Kernal function
jmp jsrfar3
exit:
rts
.endproc
.CODE