preparation for calling routines from mapped memory

c64/kernal/banking/mega65_mapping.s

@@ -0,0 +1,51 @@
+#if (ROM_LAYOUT_M65 && SEGMENT_KERNAL_0)
+
+//
+// ROM mapping routines for Mega65
+//
+
+
+map_NORMAL:
+
+	pha
+	phx
+	phy
+	phz
+
+	lda #$00
+	tax
+	tay
+	taz
+
+	// FALLTROUGH
+
+map_end:
+
+	map
+	eom
+
+	plz
+	ply
+	plx
+	pla
+
+	rts
+
+
+map_KERNAL_1:
+
+	pha
+	phx
+	phy
+	phz
+
+	lda #$00
+	tay
+	taz
+
+	ldx #$42    // XXX map 8KB from 0x20000 to 0x4000 - somehow does not seem to work
+
+	bne map_end
+
+
+#endif // ROM layout