From 0248da5e2c262d6934fd48c23212d866e250b9ed Mon Sep 17 00:00:00 2001
From: Duncan Smith
Date: Sat, 26 Jun 2010 21:28:22 -0700
Subject: Rewrote loader routine in C

---
 asm_vars.h | 17 +++++++++++++++++
 loader.c   | 42 ++++++++++++++++++++++++++++++++++++++++++
 main.asm   | 35 ++++++++++-------------------------
 3 files changed, 69 insertions(+), 25 deletions(-)
 create mode 100644 asm_vars.h
 create mode 100644 loader.c

diff --git a/asm_vars.h b/asm_vars.h
new file mode 100644
index 0000000..1783bfa
--- /dev/null
+++ b/asm_vars.h
@@ -0,0 +1,17 @@
+#ifndef ASM_VARS_H
+#define ASM_VARS_H
+
+extern void* mem_page_0;
+extern void* mem_page_1;
+extern void* mem_page_2;
+extern void* mem_page_3;
+extern void* mem_page_loc_0;
+extern void* mem_page_loc_1;
+extern void* mem_page_loc_2;
+extern void* mem_page_loc_3;
+
+extern void* pages[];
+
+
+
+#endif
diff --git a/loader.c b/loader.c
new file mode 100644
index 0000000..9808b34
--- /dev/null
+++ b/loader.c
@@ -0,0 +1,42 @@
+/* Loading routines for 680 project.
+ *
+ * Includes splash screen, choose-an-image, etc.
+ *
+ * Copyright 2010, Duncan Smith
+ * GPL
+ */
+#include <tigcc.h>
+#include "asm_vars.h"
+
+void init_load(void)
+{
+	pages = malloc(256 * sizeof(void*));
+
+	/* Page layout:
+	 * 0x40  RAM
+	 * 0x41  RAM
+
+	 * 0x00  ROM
+	 * ... all the way to ...
+	 * 0x1f  ROM
+	 */
+
+	pages[0x40] = malloc(PAGE_SIZE * sizeof(char));
+	pages[0x41] = malloc(PAGE_SIZE * sizeof(char));
+
+	for (int i = 0; i++; i <= 0x1f) {
+		pages[i] = pages[0x40];
+	}
+
+	mem_page_0 = pages[0];
+	mem_page_loc_0 = 0;
+	mem_page_1 = pages[0x40];
+	mem_page_loc_1 = 0x40;
+	mem_page_2 = pages[0];
+	mem_page_loc_2 = 0;
+	mem_page_3 = pages[0x40];
+	mem_page_loc_3 = 0x40;
+
+	return;
+
+}
diff --git a/main.asm b/main.asm
index d2727ea..05235f5 100644
--- a/main.asm
+++ b/main.asm
@@ -51,6 +51,7 @@
 
 __main:
 	movem.l d0-d7/a0-a6,-(sp)
+	bsr	init_load
 	bsr	emu_setup
 	lea	emu_plain_op,a5
 	bsr	emu_run
@@ -63,27 +64,6 @@ __main:
 	include	"alu.asm"
 
 emu_setup:
-	;; Allocate memory pages; for now I assume this succeeds
-	move.l	#$4000,-(a7)
-	ROM_CALL	malloc
-	addq	#4,a7
-	move.l	a0,ref_0
-
-	move.l	#$4000,-(a7)
-	ROM_CALL	malloc
-	addq	#4,a7
-	move.l	a0,ref_1
-
-	move.l	#$4000,-(a7)
-	ROM_CALL	malloc
-	addq	#4,a7
-	move.l	a0,ref_2
-
-	move.l	#$4000,-(a7)
-	ROM_CALL	malloc
-	addq	#4,a7
-	move.l	a0,ref_3
-
 	movea	emu_plain_op,a5
 	lea	emu_run,a2
 
@@ -111,10 +91,15 @@ deref:
 	rts
 
 deref_table:
-ref_0:	dc.l	0		; bank 0
-ref_1:	dc.l	0		; bank 1
-ref_2:	dc.l	0		; bank 2
-ref_3:	dc.l	0		; bank 3
+mem_page_0:	dc.l	0		; bank 0
+mem_page_1:	dc.l	0		; bank 1
+mem_page_2:	dc.l	0		; bank 2
+mem_page_3:	dc.l	0		; bank 3
+
+mem_page_loc_0:	dc.b	0
+mem_page_loc_1:	dc.b	0
+mem_page_loc_2:	dc.b	0
+mem_page_loc_3:	dc.b	0
 
 	;; Take a physical address in a0 and turn it into a virtual
 	;; address in d0
-- 
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