Struct for RCP and VideoInterface registers

src/lib.rs

@@ -4,3 +4,4 @@ pub mod mmu;
 pub mod rom;
 pub mod rdram;
 pub mod emulator;
+pub mod rcp;

src/mmu.rs

@@ -2,6 +2,7 @@ use std::ops::RangeInclusive;
 
 use crate::rdram::RDRAM;
 use crate::rom::ROM;
+use crate::rcp::RCP;
 
 pub const KUSEG: RangeInclusive<i64> = 0x00000000..=0x7FFFFFFF;
 pub const KSEG0: RangeInclusive<i64> = 0x80000000..=0x9FFFFFFF;
@@ -39,6 +40,7 @@ pub const EXTERNAL_SYSAD_DEVICE_BUS: RangeInclusive<i64>    = 0x80000000..=0xFFF
 pub struct MMU {
     rdram: RDRAM,
     rom: ROM,
+    rcp: RCP,
 }
 
 impl MMU {
@@ -58,6 +60,7 @@ impl MMU {
         };
         Self {
             rdram: RDRAM::new(),
+            rcp: RCP::new(),
             rom,
         }
     }
@@ -141,7 +144,7 @@ impl MMU {
         } else if MIPS_INTERFACE.contains(&address) {
             return 0;
         } else if VIDEO_INTERFACE.contains(&address) {
-            return 0;
+            return self.rcp.video_interface.get_register(address);
         } else if AUDIO_INTERFACE.contains(&address) {
             return 0;
         } else if PERIPHERAL_INTERFACE.contains(&address) {
@@ -151,7 +154,7 @@ impl MMU {
         } else if SERIAL_INTERFACE.contains(&address) {
             return 0;
         } else if UNUSED.contains(&address) {
-            return 0;
+            return 0xFF;
         } else if CARTRIDGE_DOMAIN_2_ADDRESS_1.contains(&address) {
             return 0;
         } else if CARTRIDGE_DOMAIN_1_ADDRESS_1.contains(&address) {
@@ -189,6 +192,7 @@ impl MMU {
         } else if RDP_SPAN_REGISTERS.contains(&address) {
         } else if MIPS_INTERFACE.contains(&address) {
         } else if VIDEO_INTERFACE.contains(&address) {
+            self.rcp.video_interface.set_register(address, data);
         } else if AUDIO_INTERFACE.contains(&address) {
         } else if PERIPHERAL_INTERFACE.contains(&address) {
         } else if RDRAM_INTERFACE.contains(&address) {

src/rcp.rs

@@ -0,0 +1,40 @@
+pub struct VideoInterface {
+    registers: [u8; 0x100000],
+}
+
+impl VideoInterface {
+    pub fn new() -> Self {
+        let mut registers = [0; 0x100000];
+        // Initialize VI_V_INTR 0x0440 000C: https://n64brew.dev/wiki/Video_Interface#0x0440_000C_-_VI_V_INTR
+        registers[0x0440000C] = 0xFF;
+        registers[0x0440000B] = 0x03;
+        // Initialize VI_BURST 0x0440 0014: https://n64brew.dev/wiki/Video_Interface#0x0440_0014_-_VI_BURST
+        registers[0x04400014] = 0x01;
+        // Initialize VI_H_SYNC 0x0440 001C: https://n64brew.dev/wiki/Video_Interface#0x0440_001C_-_VI_H_SYNC
+        registers[0x0440001C] = 0xFF;
+        registers[0x0440001B] = 0x07;
+        Self {
+            registers,
+        }
+    }
+
+    pub fn get_register(&self, address: i64) -> u8 {
+        self.registers[(address - 0x04400000) as usize]
+    }
+
+    pub fn set_register(&mut self, address: i64, data: u8) {
+        self.registers[(address - 0x04400000) as usize] = data;
+    }
+}
+
+pub struct RCP {
+    pub video_interface: VideoInterface,
+}
+
+impl RCP {
+    pub fn new() -> Self {
+        Self {
+            video_interface: VideoInterface::new(),
+        }
+    }
+}