From d0a805c6a00c8ac8b83293cc188587b96737f024 Mon Sep 17 00:00:00 2001
From: Alan Cox <alan@etchedpixels.co.uk>
Date: Thu, 6 Nov 2014 21:38:39 +0000
Subject: [PATCH] msx: Add initial (non working) bootrom test, also make it
 build fuzix.com

---
 Kernel/platform-msx2/Makefile  |  4 +-
 Kernel/platform-msx2/bootrom.s | 94 ++++++++++++++++++++++++++++++++++
 Kernel/platform-msx2/crt0.s    |  1 +
 Kernel/platform-msx2/uzi.lnk   |  3 +-
 4 files changed, 100 insertions(+), 2 deletions(-)
 create mode 100644 Kernel/platform-msx2/bootrom.s

diff --git a/Kernel/platform-msx2/Makefile b/Kernel/platform-msx2/Makefile
index eb8c11b2..9c53bd43 100644
--- a/Kernel/platform-msx2/Makefile
+++ b/Kernel/platform-msx2/Makefile
@@ -3,7 +3,7 @@ CSRCS = devtty.c devfd.c devhd.c devlpr.c
 CSRCS += devices.c main.c
 
 ASRCS = msx2.s crt0.s vdp.s
-ASRCS += tricks.s commonmem.s
+ASRCS += tricks.s commonmem.s bootrom.s
 
 COBJS = $(CSRCS:.c=.rel)
 AOBJS = $(ASRCS:.s=.rel)
@@ -23,3 +23,5 @@ clean:
 	rm -f $(OBJS) $(JUNK)  core *~ 
 
 image:
+	dd if=../fuzix.bin of=../fuzix.com bs=256 skip=1
+	dd if=../fuzix.bin of=../fuzix.cart bs=16384 conv=sync
diff --git a/Kernel/platform-msx2/bootrom.s b/Kernel/platform-msx2/bootrom.s
new file mode 100644
index 00000000..4a1d76ce
--- /dev/null
+++ b/Kernel/platform-msx2/bootrom.s
@@ -0,0 +1,94 @@
+		.area _CODE
+
+		.db 'A'
+		.db 'B'
+		.dw wtfami + 0x4000
+		.dw 0,0,0,0,0,0
+
+;
+;	Entered at 0x4000 but linked at 0x0000 so be careful
+;
+wtfami:		di
+
+		ld a, #0x23		; Debug port
+		out (0x2e), a
+		ld a, #':'
+		out (0x2f), a
+
+		in a, (0xA8)
+		ld d, a
+		and #0x0C		; bits for 0x4000
+		ld b, a
+		rla
+		rla			; to 0x8000
+		or b			; and 0x4000
+		rla
+		rla			; to 0xC000/8000
+		or b			; and 0x4000
+		ld b, a			; B is now the bits for
+					; putting 48K of cartridge
+					; in place
+		out (0xA8), a		; Map cartridge
+		ld a, #3
+		out (0xFC), a		; Begin mapping RAM
+		ld a, #'1'
+		out (0x2f), a
+		exx
+		ld hl, #0x4000		; Cartridge 0x4000 -> RAM 0
+		ld de, #0x0
+		ld bc, #0x4000
+		ldir
+		dec a
+		out (0xFC), a
+		ld de, #0		; 0x8000 -> RAM 0x4000
+		ld bc, #0x4000
+		ldir
+		dec a
+		out (0xFC), a
+		ld de, #0		; 0xC000 -> RAM 0x8000
+		ld bc, #0x4000
+		ldir
+		exx	
+		ld a, #3		; put the maps right
+		out (0xFC), a
+		ld a, #2
+		out (0xFD), a
+		ld a, #1
+		out (0xFE), a
+		xor a
+		out (0xFF), a
+		ld a, #'G'
+		out (0x2f), a
+		ld a, d
+		and #0xC0		; RAM in 0xC000 slot bits
+		ld e, a			
+		rra			; Propogate into other banks
+		rra
+		or e
+		rra
+		rra
+		or e
+		rra
+		rra
+		or e
+		ld e, a			; E is now "all RAM"
+		and #0xF3
+		ld c, a
+		ld a, d			; Get original status
+		and #0x0c		; bits for 0x4000 as cartridge
+		or c			; bits for the RAM
+		out (0xA8), a
+		ld a, #'O'
+		out (0x2f), a
+		;
+		;	We now have RAM where we need it
+		;
+		jp ramgo
+ramgo:		ld a, #'!'
+		out (0x2f), a
+		ld a, e
+		out (0xA8), a		; Now go all ram
+		jp 0x100
+
+		; Hack Hack FIXME
+		.ds 0x73
diff --git a/Kernel/platform-msx2/crt0.s b/Kernel/platform-msx2/crt0.s
index fc95c4fe..1765f369 100644
--- a/Kernel/platform-msx2/crt0.s
+++ b/Kernel/platform-msx2/crt0.s
@@ -2,6 +2,7 @@
 	        ; WRS: Note we list all our segments here, even though
 	        ; we don't use them all, because their ordering is set
 	        ; when they are first seen.	
+		.area _BOOT
 	        .area _CODE
 	        .area _CODE2
 		.area _VIDEO
diff --git a/Kernel/platform-msx2/uzi.lnk b/Kernel/platform-msx2/uzi.lnk
index e9ffdd8f..d5c5a4f5 100644
--- a/Kernel/platform-msx2/uzi.lnk
+++ b/Kernel/platform-msx2/uzi.lnk
@@ -1,8 +1,9 @@
 -mwxuy
 -i uzi.ihx
--b _CODE=0x0100
+-b _CODE=0x0000
 -b _COMMONMEM=0xF000
 -l z80
+platform-msx2/bootrom.rel
 platform-msx2/crt0.rel
 platform-msx2/commonmem.rel
 platform-msx2/msx2.rel
-- 
2.34.1