Model the cartidge.

Former-commit-id: b51d2928631bfc438b9f1b15fafcaa9d90008179

src/bin/main.rs

@@ -9,6 +9,7 @@ extern crate rustboyadvance_ng;
 
 use rustboyadvance_ng::arm7tdmi;
 use rustboyadvance_ng::debugger::{Debugger, DebuggerError};
+use rustboyadvance_ng::cartridge::Cartridge;
 use rustboyadvance_ng::sysbus::SysBus;
 use rustboyadvance_ng::util::read_bin_file;
 
@@ -50,7 +51,10 @@ fn run_debug(matches: &ArgMatches) -> GBAResult<()> {
     let bios_bin = read_bin_file(matches.value_of("bios").unwrap_or_default())?;
     let rom_bin = read_bin_file(matches.value_of("game_rom").unwrap())?;
 
-    let sysbus = SysBus::new(bios_bin, rom_bin);
+    let gamepak = Cartridge::new(rom_bin);
+    println!("loaded rom: {:#?}", gamepak.header);
+
+    let sysbus = SysBus::new(bios_bin, gamepak);
     let mut core = arm7tdmi::cpu::Core::new();
     core.reset();
     core.set_verbose(true);

src/cartridge.rs

@@ -0,0 +1,104 @@
+use std::str::from_utf8;
+
+use nom::number::streaming::le_u32;
+
+use crate::arm7tdmi::{
+    bus::{Bus, MemoryAccess, MemoryAccessType, MemoryAccessWidth},
+    Addr,
+};
+use crate::sysbus::WaitState;
+
+/// From GBATEK
+///
+/// The first 192 bytes at 8000000h-80000BFh in ROM are used as cartridge header. The same header is also used for Multiboot images at 2000000h-20000BFh (plus some additional multiboot entries at 20000C0h and up).
+///
+/// Header Overview
+///   Address Bytes Expl.
+///   000h    4     ROM Entry Point  (32bit ARM branch opcode, eg. "B rom_start")
+///   004h    156   Nintendo Logo    (compressed bitmap, required!)
+///   0A0h    12    Game Title       (uppercase ascii, max 12 characters)
+///   0ACh    4     Game Code        (uppercase ascii, 4 characters)
+///   0B0h    2     Maker Code       (uppercase ascii, 2 characters)
+///   0B2h    1     Fixed value      (must be 96h, required!)
+///   0B3h    1     Main unit code   (00h for current GBA models)
+///   0B4h    1     Device type      (usually 00h) (bit7=DACS/debug related)
+///   0B5h    7     Reserved Area    (should be zero filled)
+///   0BCh    1     Software version (usually 00h)
+///   0BDh    1     Complement check (header checksum, required!)
+///   0BEh    2     Reserved Area    (should be zero filled)
+///   --- Additional Multiboot Header Entries ---
+///   0C0h    4     RAM Entry Point  (32bit ARM branch opcode, eg. "B ram_start")
+///   0C4h    1     Boot mode        (init as 00h - BIOS overwrites this value!)
+///   0C5h    1     Slave ID Number  (init as 00h - BIOS overwrites this value!)
+///   0C6h    26    Not used         (seems to be unused)
+///   0E0h    4     JOYBUS Entry Pt. (32bit ARM branch opcode, eg. "B joy_start")
+///
+#[derive(Debug)]
+pub struct CartridgeHeader {
+    // rom_entry_point: Addr,
+    game_title: String,
+    game_code: String,
+    maker_code: String,
+    software_version: u8,
+    checksum: u8,
+    // ram_entry_point: Addr,
+    // joybus_entry_point: Addr,
+}
+
+impl CartridgeHeader {
+    fn parse(bytes: &[u8]) -> CartridgeHeader {
+        // let (_, rom_entry_point) = le_u32(bytes).unwrap();
+        let game_title = from_utf8(&bytes[0xa0..0xac]).unwrap();
+        let game_code = from_utf8(&bytes[0xac..0xb0]).unwrap();
+        let maker_code = from_utf8(&bytes[0xb0..0xb2]).unwrap();
+        // let (_, ram_entry_point) = le_u32(&bytes[0xc0..]).unwrap();
+        // let (_, joybus_entry_point) = le_u32(&bytes[0xc0..]).unwrap();
+
+        CartridgeHeader {
+            // rom_entry_point: rom_entry_point,
+            game_title: String::from(game_title),
+            game_code: String::from(game_code),
+            maker_code: String::from(maker_code),
+            software_version: bytes[0xbc],
+            checksum: bytes[0xbd],
+            // ram_entry_point: ram_entry_point,
+            // joybus_entry_point: joybus_entry_point,
+        }
+    }
+}
+
+#[derive(Debug)]
+pub struct Cartridge {
+    pub header: CartridgeHeader,
+    bytes: Box<[u8]>,
+    ws: WaitState,
+}
+
+impl Cartridge {
+    pub fn new(gamepak: Vec<u8>) -> Cartridge {
+        let header = CartridgeHeader::parse(&gamepak);
+        Cartridge {
+            header: header,
+            bytes: gamepak.into_boxed_slice(),
+            ws: WaitState::new(5, 5, 8),
+        }
+    }
+}
+
+impl Bus for Cartridge {
+    fn get_bytes(&self, addr: Addr) -> &[u8] {
+        &self.bytes[addr as usize..]
+    }
+
+    fn get_bytes_mut(&mut self, addr: Addr) -> &mut [u8] {
+        &mut self.bytes[addr as usize..]
+    }
+
+    fn get_cycles(&self, _addr: Addr, access: MemoryAccess) -> usize {
+        match access.1 {
+            MemoryAccessWidth::MemoryAccess8 => self.ws.access8,
+            MemoryAccessWidth::MemoryAccess16 => self.ws.access16,
+            MemoryAccessWidth::MemoryAccess32 => self.ws.access32,
+        }
+    }
+}

src/lib.rs

@@ -15,6 +15,7 @@ extern crate ansi_term;
 extern crate colored; // not needed in Rust 2018
 
 pub mod arm7tdmi;
+pub mod cartridge;
 pub mod debugger;
 pub mod disass;
 pub mod sysbus;

src/sysbus.rs

@@ -1,5 +1,7 @@
 use std::io;
 
+use crate::cartridge::Cartridge;
+
 use super::arm7tdmi::bus::{Bus, MemoryAccess, MemoryAccessWidth};
 use super::arm7tdmi::Addr;
 
@@ -30,7 +32,7 @@ pub struct WaitState {
 }
 
 impl WaitState {
-    fn new(access8: usize, access16: usize, access32: usize) -> WaitState {
+    pub fn new(access8: usize, access16: usize, access32: usize) -> WaitState {
         WaitState {
             access8,
             access16,
@@ -73,32 +75,26 @@ pub struct SysBus {
     palette_ram: BoxedMemory,
     vram: BoxedMemory,
     oam: BoxedMemory,
-    gamepak_flashrom: BoxedMemory,
+    gamepak: Cartridge,
 }
 
 impl SysBus {
-    pub fn new(bios_rom: Vec<u8>, game_rom: Vec<u8>) -> SysBus {
+    pub fn new(bios_rom: Vec<u8>, gamepak: Cartridge) -> SysBus {
         SysBus {
-            bios: BoxedMemory(bios_rom.into_boxed_slice(), Default::default()),
+            bios: BoxedMemory::new(bios_rom.into_boxed_slice()),
-            onboard_work_ram: BoxedMemory(
+            onboard_work_ram: BoxedMemory::new(vec![0; WORK_RAM_SIZE].into_boxed_slice()),
-                vec![0; WORK_RAM_SIZE].into_boxed_slice(),
+            internal_work_ram: BoxedMemory::new(vec![0; INTERNAL_RAM].into_boxed_slice()),
-                Default::default(),
+            ioregs: BoxedMemory::new(vec![0; 1024].into_boxed_slice()),
-            ),
+            palette_ram: BoxedMemory::new_with_waitstate(
-            internal_work_ram: BoxedMemory(
-                vec![0; INTERNAL_RAM].into_boxed_slice(),
-                Default::default(),
-            ),
-            ioregs: BoxedMemory(vec![0; 1024].into_boxed_slice(), Default::default()),
-            palette_ram: BoxedMemory(
                 vec![0; PALETTE_RAM_SIZE].into_boxed_slice(),
                 WaitState::new(1, 1, 2),
             ),
-            vram: BoxedMemory(
+            vram: BoxedMemory::new_with_waitstate(
                 vec![0; VIDEO_RAM_SIZE].into_boxed_slice(),
                 WaitState::new(1, 1, 2),
             ),
-            oam: BoxedMemory(vec![0; OAM_SIZE].into_boxed_slice(), Default::default()),
+            oam: BoxedMemory::new(vec![0; OAM_SIZE].into_boxed_slice()),
-            gamepak_flashrom: BoxedMemory(game_rom.into_boxed_slice(), WaitState::new(5, 5, 8)),
+            gamepak: gamepak,
         }
     }
 
@@ -111,7 +107,7 @@ impl SysBus {
             0x0500_0000...0x0500_03ff => &self.palette_ram,
             0x0600_0000...0x0601_7fff => &self.vram,
             0x0700_0000...0x0700_03ff => &self.oam,
-            0x0800_0000...0x09ff_ffff => &self.gamepak_flashrom,
+            0x0800_0000...0x09ff_ffff => &self.gamepak,
             _ => panic!("unmapped address @0x{:08x}", addr),
         }
     }
@@ -126,7 +122,7 @@ impl SysBus {
             0x0500_0000...0x0500_03ff => &mut self.palette_ram,
             0x0600_0000...0x0601_7fff => &mut self.vram,
             0x0700_0000...0x0700_03ff => &mut self.oam,
-            0x0800_0000...0x09ff_ffff => &mut self.gamepak_flashrom,
+            0x0800_0000...0x09ff_ffff => &mut self.gamepak,
             _ => panic!("unmapped address @0x{:08x}", addr),
         }
     }