112 lines
2.2 KiB
ArmAsm
112 lines
2.2 KiB
ArmAsm
;; IMPORTANT:
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;; These routines lengths cannot be changed without changing
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;; the aliases for peek_under_roms, poke_under_roms etc
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;; in ,aliases.s.
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;; Thus those addresses are expressed using formulae.
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install_ram_routines:
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;; Copy routines into place
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ldx #ram_routines_len-1
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*
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lda ram_routines_start,x
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sta tiny_nmi_handler,x
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dex
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bpl -
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;; Point NMI handler to tiny_nmi_handler
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lda #<tiny_nmi_handler
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sta $FFFE
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lda #>tiny_nmi_handler
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sta $FFFF
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rts
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ram_routines_start:
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;; XXX - Routine order must match that of the KERNAL version of the file.
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;; (since it has fewer routines)
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tiny_nmi_handler_routine:
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inc missed_nmi_flag
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rti
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peek_under_roms_routine:
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php
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; Offset of arg of lda ($00),y
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stx peek_under_roms+pa-peek_under_roms_routine+1
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jsr memmap_allram
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pa: lda ($00),y
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jsr memmap_normal
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plp
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rts
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poke_under_roms_routine:
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php
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; Offset of arg of lda ($00),y
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stx poke_under_roms+pb-poke_under_roms_routine+1
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jsr memmap_allram
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pb: sta ($00),y
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jsr memmap_normal
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plp
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rts
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memmap_normal_routine:
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pha
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lda #$37
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sta $01
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pla
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rts
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memmap_allram_routine:
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sei
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pha
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lda #$04
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sta $01
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pla
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rts
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shift_mem_up_routine:
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;; Move memmove_size bytes from memmove_src to memmove_dst,
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;; where memmove_dst > memmove_src
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;; This means we have to copy from the back end down.
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;; This routine assumes the pointers are already pointed
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;; to the end of the areas, and that Y is correctly initialised
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;; to allow the copy to begin.
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php
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jsr memmap_allram
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smu1:
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lda (memmove_src),y
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sta (memmove_dst),y
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dey
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bne smu1
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dec memmove_src+1
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dec memmove_dst+1
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dec memmove_size+1
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bne smu1
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plp
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jmp memmap_normal
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shift_mem_down_routine:
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;; Move memmove_size bytes from memmove_src to memmove_dst,
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;; where memmove_dst > memmove_src
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;; This means we have to copy from the back end down.
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;; This routine assumes the pointers are already pointed
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;; to the end of the areas, and that Y is correctly initialised
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;; to allow the copy to begin.
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php
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jsr memmap_allram
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smd1:
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lda (memmove_src),y
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sta (memmove_dst),y
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iny
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bne smd1
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inc memmove_src+1
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inc memmove_dst+1
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dec memmove_size+1
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bne smd1
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plp
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jmp memmap_normal
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ram_routines_end:
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.alias ram_routines_len ram_routines_end-ram_routines_start
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