hw initialization for running under hypervisor

src/kernal/board_m65/fff8.mega65_vector_hyper_reset.s

@@ -0,0 +1,4 @@
+;; #LAYOUT# M65 KERNAL_0 #TAKE
+;; #LAYOUT# *   *        #IGNORE
+
+!word m65_hypervisor_reset

src/kernal/board_m65/mega65_hypervisor_reset.s

@@ -0,0 +1,34 @@
+;; #LAYOUT# M65 KERNAL_0 #TAKE
+;; #LAYOUT# *   *        #IGNORE
+
+; Reset (hardware initialization) to be used when Open ROMs is used under hypervisor
+; XXX for now this is just a proposal
+
+
+m65_hypervisor_reset:
+
+	; Proceed like with normal reset, skip problematic parts
+
+	sei                      ; disable the interrupts, as fast as possible
+	cld                      ; Kernal is not designed to operate in decimal mode
+
+	see                      ; disable extended stack
+	ldx #$FF                 ; initial stack size
+	txs
+
+	; XXX size-optimize this; share code with regular reset
+	
+	jsr m65_reset_part       ; initialize MEGA65 specific hardware
+
+	ldx #$28                 ; 40 columns, screen disabled for now
+	stx VIC_SCROLX
+	
+	jsr IOINIT_skip_DOS      ; DOS needs to map memory over $8000 - not allowed under hypervisor
+	jsr JRAMTAS
+	jsr JRESTOR
+	jsr JCINT
+
+	; Finished
+
+	cli
+	rts

src/kernal/init/fda3.ioinit.s

@@ -22,6 +22,12 @@ IOINIT:
 	jsr (VK1__IOINIT)
 	jmp m65dos_init 	               ; end by initializing the MEGA65 internal DOS
 
+IOINIT_skip_DOS:
+
+	jsr map_KERNAL_1
+	jsr (VK1__IOINIT)
+	jmp map_NORMAL
+
 } else {
 
 	;