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add support for SHADOW_RAM2 segment

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This commit is contained in:
Christian Groessler 2013-09-18 00:25:18 +02:00
parent 3df94fba92
commit 678ffbdd4d
1 changed files with 37 additions and 10 deletions
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47
libsrc/atari/shadow_ram_prepare.s
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@ -14,9 +14,9 @@ DEBUG = 1
.if .defined(__ATARIXL__)
.export sramprep
.import __SRPREP_LOAD__, __SRPREP_SIZE__
.import __SHADOW_RAM_LOAD__, __SHADOW_RAM_SIZE__
.import __SHADOW_RAM_RUN__
.import __SRPREP_LOAD__, __SRPREPCHNK_LAST__
.import __SHADOW_RAM_LOAD__, __SHADOW_RAM_SIZE__, __SHADOW_RAM_RUN__
.import __SHADOW_RAM2_LOAD__, __SHADOW_RAM2_SIZE__, __SHADOW_RAM2_RUN__
.import __CHARGEN_START__, __CHARGEN_SIZE__
.import __STARTADDRESS__ ; needed by xlmemchk.inc
@ -48,7 +48,7 @@ cont: ldx #0 ; channel 0
.segment "SRPREPHDR"
.word __SRPREP_LOAD__
.word __SRPREP_LOAD__ + __SRPREP_SIZE__ + __SHADOW_RAM_SIZE__ - 1
.word __SRPREPCHNK_LAST__ - 1
; ------------------------------------------------------------------------
; Actual code
@ -148,15 +148,15 @@ scrok: ; now close it again -- we don't need it anymore
jsr CIOV_org
; copy chargen to low memory
; copy chargen to low memory, just after the next possible address beyond our loaded chunk data
.ifdef DEBUG
print_string "copy chargen to low memory"
.endif
lda #>(__SRPREP_LOAD__ + __SRPREP_SIZE__ + __SHADOW_RAM_SIZE__)
lda #>__SRPREPCHNK_LAST__
sta ptr3+1
lda #<(__SRPREP_LOAD__ + __SRPREP_SIZE__ + __SHADOW_RAM_SIZE__)
lda #<__SRPREPCHNK_LAST__
sta ptr3
beq cg_addr_ok
@ -215,7 +215,7 @@ cg_addr_ok2:
sta CHBASE
sta CHBAS
; copy shadow RAM contents to their destination
; copy shadow RAM contents to their destination (segment SHADOW_RAM)
lda #<__SHADOW_RAM_SIZE__
bne do_copy
@ -240,6 +240,32 @@ do_copy:lda #<__SHADOW_RAM_LOAD__
no_copy:
; copy shadow RAM #2 contents to their destination (segment SHADOW_RAM2)
lda #<__SHADOW_RAM2_SIZE__
bne do_copy2
lda #>__SHADOW_RAM2_SIZE__
beq no_copy2 ; we have no shadow RAM contents
; ptr1 - src; ptr2 - dest; tmp1, tmp2 - len
do_copy2:
lda #<__SHADOW_RAM2_LOAD__
sta ptr1
lda #>__SHADOW_RAM2_LOAD__
sta ptr1+1
lda #<__SHADOW_RAM2_RUN__
sta ptr2
lda #>__SHADOW_RAM2_RUN__
sta ptr2+1
lda #<__SHADOW_RAM2_SIZE__
sta tmp1
lda #>__SHADOW_RAM2_SIZE__
sta tmp2
jsr memcopy
no_copy2:
; copy chargen to its new (final) location
lda ptr3
@ -361,10 +387,11 @@ screen_device_length = * - screen_device
.endif
; ------------------------------------------------------------------------
; Provide an empty SHADOW_RAM segment in order that the linker is happy
; if the user program doesn't have a SHADOW_RAM segment.
; Provide empty SHADOW_RAM and SHADOW_RAM2 segments in order that the
; linker is happy if the user program doesn't have these segments.
.segment "SHADOW_RAM"
.segment "SHADOW_RAM2"
; ------------------------------------------------------------------------