50 lines
1.5 KiB
ArmAsm
50 lines
1.5 KiB
ArmAsm
;; #LAYOUT# M65 KERNAL_0 #TAKE
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;; #LAYOUT# * * #IGNORE
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; Reset (hardware initialization) to be used when Open ROMs is used under hypervisor
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m65_hypervisor_reset:
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; Proceed like with normal reset, skip problematic parts
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sei ; disable the interrupts, as fast as possible
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cld ; Kernal is not designed to operate in decimal mode
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lda #$00
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sta NMINV+1 ; soft-disable custom NMI interrupt handler
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; Do not reset the stack (see, ldx #$FF, txs) - we need to know where to return
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jsr m65_reset_part ; init MEGA65 specific hardware, shutdown VIC-IV, clear native mode mark
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ldx #$28 ; 40 columns, screen disabled for now
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stx VIC_SCROLX
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jsr IOINIT_skip_DOS ; better not to initialize DOS under hypervisor, risk of incompatibility
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jsr m65_reset_common ; RAMTAS, RESTOR, CINT
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; Restore hypervisor memory mapping and quit
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lda #$00 ; lower memory - megabyte $00
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ldx #$0F ; lower memory - request to set the megabyte
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ldy #$FF ; higher memory - megabyte $FF
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ldz #$0F ; higher memory - request to set the megabyte
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map
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tax ; lower memory - keep unmapped (.A is already 0)
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tay ; higher memory - lower 16 bits of the offset are also 0's
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ldz #$3F ; higher memory - map is %0011 = $3, offset is $FF0
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map
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eom
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cli
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rts
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m65_reset_common:
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jsr JRAMTAS
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jsr JRESTOR
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jmp JCINT
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