mirror of https://github.com/stid/woz64.git
58 lines
1.3 KiB
NASM
58 lines
1.3 KiB
NASM
#importonce
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* = * "Memory Routines"
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.macro clone(from, to, dest) {
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lda #<from
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sta MemMap.MEMORY.from
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lda #>from
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sta MemMap.MEMORY.from+1
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lda #<dest
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sta MemMap.MEMORY.dest
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lda #>dest
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sta MemMap.MEMORY.dest+1
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lda #<to-from
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sta MemMap.MEMORY.size+1
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lda #>to-from
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sta MemMap.MEMORY.size
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jsr Memory._clone
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}
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.filenamespace Memory
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// move memory down
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//
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// from = source start address
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// to = destination start address
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// size = number of bytes to move
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//
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_clone: {
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sei
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ldy #0
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ldx MemMap.MEMORY.size
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beq md2
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md1: lda (MemMap.MEMORY.from),y // move a page at a time
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sta (MemMap.MEMORY.dest),y
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iny
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bne md1
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inc MemMap.MEMORY.from+1
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inc MemMap.MEMORY.dest+1
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dex
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bne md1
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md2: ldx MemMap.MEMORY.size+1
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beq md4
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md3: lda (MemMap.MEMORY.from),y // move the remaining bytes
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sta (MemMap.MEMORY.dest),y
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iny
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dex
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bne md3
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cli
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md4: rts
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}
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#import "mem_map.asm"
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