Add init functions for disk2, sys rom

Also move the defines for bank offset, rom size, etc. into apple2.mem.h
which makes a little more sense.

include/apple2.h

@@ -6,21 +6,6 @@
 #include "vm_bitfont.h"
 #include "vm_screen.h"
 
-/*
- * The size of our block of ROM is 12k
- */
-#define APPLE2_ROM_SIZE 0x3000
-
-/*
- * Whereas the second bank of RAM is a mere 4k
- */
-#define APPLE2_RAM2_SIZE 0x1000
-
-/*
- * This is the base address (or offset) for all bank-switched memory
- */
-#define APPLE2_BANK_OFFSET 0xD000
-
 enum video_modes {
     VIDEO_40COL_TEXT,
     VIDEO_LORES,

include/apple2.mem.h

@@ -4,8 +4,29 @@
 #include "apple2.h"
 #include "vm_segment.h"
 
+#define APPLE2_DISK2_ROM_OFFSET 0xC600
+#define APPLE2_DISK2_ROM_SIZE 0x100
+
+/*
+ * The size of our block of ROM is 12k
+ */
+#define APPLE2_ROM_SIZE 0x3000
+
+/*
+ * Whereas the second bank of RAM is a mere 4k
+ */
+#define APPLE2_RAM2_SIZE 0x1000
+
+/*
+ * This is the base address (or offset) for all bank-switched memory
+ */
+#define APPLE2_BANK_OFFSET 0xD000
+
+
 extern vm_8bit apple2_mem_read_bank(vm_segment *, size_t, void *);
 extern void apple2_mem_write_bank(vm_segment *, size_t, vm_8bit, void *);
 extern void apple2_mem_map(apple2 *);
+extern int apple2_mem_init_disk2_rom(apple2 *);
+extern int apple2_mem_init_sys_rom(apple2 *);
 
 #endif

src/apple2.mem.c

@@ -3,6 +3,7 @@
  */
 
 #include "apple2.h"
+#include "apple2.mem.h"
 
 /*
  * Return a byte of memory from a bank-switchable address. This may be
@@ -93,3 +94,52 @@ apple2_mem_map(apple2 *mach)
         vm_segment_write_map(mach->memory, addr, apple2_mem_write_bank);
     }
 }
+
+/*
+ * Since we can't write into ROM normally, we need a separate function
+ * we can call which will do the writing for us.
+ */
+int
+apple2_mem_init_disk2_rom(apple2 *mach)
+{
+    FILE *stream;
+    int err;
+
+    stream = fopen("./disk2.rom", "r");
+    if (stream == NULL) {
+        log_critical("Could not read disk2.rom");
+        return ERR_BADFILE;
+    }
+
+    err = vm_segment_fread(mach->memory, stream,
+                           APPLE2_DISK2_ROM_OFFSET, APPLE2_DISK2_ROM_SIZE);
+    if (err != OK) {
+        fclose(stream);
+        log_critical("Could not read disk2.rom");
+        return ERR_BADFILE;
+    }
+
+    return OK;
+}
+
+int
+apple2_mem_init_sys_rom(apple2 *mach)
+{
+    FILE *stream;
+    int err;
+
+    stream = fopen("./apple2.rom", "r");
+    if (stream == NULL) {
+        log_critical("Could not read apple2.rom");
+        return ERR_BADFILE;
+    }
+
+    err = vm_segment_fread(mach->rom, stream, 0, APPLE2_ROM_SIZE);
+    if (err != OK) {
+        fclose(stream);
+        log_critical("Could not read apple2.rom");
+        return ERR_BADFILE;
+    }
+
+    return OK;
+}