From 755aff64baf670489cf80710c2c25ddd5cbe0aa3 Mon Sep 17 00:00:00 2001
From: FeralChild64 <you@example.com>
Date: Wed, 23 Sep 2020 15:49:26 +0200
Subject: [PATCH] fixes for hw initialization under hypervisor

---
 bin/mega65.rom                                | Bin 131072 -> 131072 bytes
 bin/mega65_pxlfont.rom                        | Bin 131072 -> 131072 bytes
 .../board_m65/mega65_hypervisor_reset.s       |  32 ++++++++++++------
 3 files changed, 21 insertions(+), 11 deletions(-)

diff --git a/bin/mega65.rom b/bin/mega65.rom
index 133aeef71b6cab6505f7dc89ca468813b8c05ae4..5366bfa02483d4b9464fd344aa2a370fc0589c00 100644
GIT binary patch
delta 2926
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diff --git a/bin/mega65_pxlfont.rom b/bin/mega65_pxlfont.rom
index a99abce62455cf1c59ff5d797bdff8e6b60a6ef1..4ba0dfa8ac9cc2d8910e4b4a189fc5d85a0aac69 100644
GIT binary patch
delta 2926
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diff --git a/src/kernal/board_m65/mega65_hypervisor_reset.s b/src/kernal/board_m65/mega65_hypervisor_reset.s
index 433240dd..64bc98eb 100644
--- a/src/kernal/board_m65/mega65_hypervisor_reset.s
+++ b/src/kernal/board_m65/mega65_hypervisor_reset.s
@@ -2,7 +2,8 @@
 ;; #LAYOUT# *   *        #IGNORE
 
 ; Reset (hardware initialization) to be used when Open ROMs is used under hypervisor
-; XXX for now this is just a proposal
+
+; XXX size-optimize this; share code with regular reset
 
 
 m65_hypervisor_reset:
@@ -12,23 +13,32 @@ m65_hypervisor_reset:
 	sei                      ; disable the interrupts, as fast as possible
 	cld                      ; Kernal is not designed to operate in decimal mode
 
-	see                      ; disable extended stack
-	ldx #$FF                 ; initial stack size
-	txs
-
-	; XXX size-optimize this; share code with regular reset
+	; Do not reset the stack (see, ldx #$FF, txs) - we need to know where to return
 	
-	jsr m65_reset_part       ; initialize MEGA65 specific hardware
-
+	jsr m65_reset_part       ; init MEGA65 specific hardware, shutdown VIC-IV, clear native mode mark
 	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 IOINIT_skip_DOS      ; better not to initialize DOS under hypervisor, risk of incompatibility
 	jsr JRAMTAS
 	jsr JRESTOR
 	jsr JCINT
 
-	; Finished
+	; Restore hypervisor memory mapping and quit
+
+	lda #$00                 ; lower memory  - megabyte $00
+	ldx #$0F                 ; lower memory  - request to set the megabyte
+	ldy #$FF                 ; higher memory - megabyte $FF
+	ldz #$0F                 ; higher memory - request to set the megabyte
+
+	map
+
+	tax                      ; lower memory  - keep unmapped (.A is already 0)
+	tay                      ; higher memory - lower 16 bits of the offset are also 0's
+	ldz #$3F                 ; higher memory - map is %0011 = $3, offset is $FF0
+
+	map
+	eom
 
 	cli
 	rts