(BIG CHANGE) memory handling has changed, MMIO is now a 2 level page table, misaligned access supported, addresses not internally split to page and offset immediately, all load/store instructions implemented. Might still have bugs

src/main.rs

@@ -7,10 +7,10 @@
 use std::{env, sync::Arc, time::Duration};
 
 use trve::{
-    consts::{Byte, DWord, HWord, Word},
+    consts::{Addr, Byte, DWord, HWord, Word},
     core::Core,
-    exceptions::ExceptionType,
-    mem::{DeviceEntry, MemConfig, MemDeviceInterface, PageNum, Ram},
+    exceptions::MemoryExceptionType,
+    mem::{MemConfig, MemDeviceInterface, MmioRoot, Ram},
 };
 
 use anyhow::{Result, bail};
@@ -20,7 +20,7 @@ use crate::basic_uart::BasicUart;
 mod execload;
 
 fn main() -> Result<()> {
-    let mut ram = Ram::try_new(16 * 1024 * 1024 / 4096)?;
+    let mut ram = Ram::try_new(16 * 1024 * 1024)?;
     let buf = ram.buf_mut();
 
     let args: Vec<String> = env::args().collect();
@@ -32,24 +32,16 @@ fn main() -> Result<()> {
 
     let entry_point = execload::load(&args[1], buf, 0x8000_0000)?;
 
+    let mut mmio_root = MmioRoot::default();
+    mmio_root.insert(0, Arc::new(DbgOut));
+
     let uart = BasicUart::new();
     let uart = uart.spawn_poller(Duration::from_millis(10));
+    mmio_root.insert(0x10000, uart);
 
     let mem_cfg = MemConfig {
         ram: Arc::new(ram),
-        ram_start: 0x8000_0000 / 4096,
-        devices: Box::new([
-            DeviceEntry {
-                base: 0,
-                size: 1,
-                interface: Arc::new(DbgOut),
-            },
-            DeviceEntry {
-                base: 1,
-                size: 1,
-                interface: uart,
-            },
-        ]),
+        mmio_root,
     };
 
     let mut core = Core::new(mem_cfg);
@@ -64,64 +56,23 @@ mod basic_uart;
 struct DbgOut;
 
 impl MemDeviceInterface for DbgOut {
-    fn write_dword(&self, page: PageNum, offset: u16, value: DWord) -> Result<(), ExceptionType> {
-        eprintln!(
-            "Wrote DWord {value:016x} to Debug-Out page {page}, offset {offset} (byte {})",
-            offset * 8
-        );
+    fn write_dword(&self, addr: Addr, value: DWord) -> Result<(), MemoryExceptionType> {
+        eprintln!("Wrote DWord {value:016x} to Debug-Out address {addr:x}");
         Ok(())
     }
 
-    fn write_word(&self, page: PageNum, offset: u16, value: Word) -> Result<(), ExceptionType> {
-        eprintln!(
-            "Wrote Word {value:08x} to Debug-Out page {page}, offset {offset} (byte {})",
-            offset * 4
-        );
+    fn write_word(&self, addr: Addr, value: Word) -> Result<(), MemoryExceptionType> {
+        eprintln!("Wrote Word {value:08x} to Debug-Out address {addr:x}");
         Ok(())
     }
 
-    fn write_hword(&self, page: PageNum, offset: u16, value: HWord) -> Result<(), ExceptionType> {
-        eprintln!(
-            "Wrote HWord {value:04x} to Debug-Out page {page}, offset {offset} (byte {})",
-            offset * 2
-        );
+    fn write_hword(&self, addr: Addr, value: HWord) -> Result<(), MemoryExceptionType> {
+        eprintln!("Wrote HWord {value:04x} to Debug-Out address {addr:x}");
         Ok(())
     }
 
-    fn write_byte(&self, page: PageNum, offset: u16, value: Byte) -> Result<(), ExceptionType> {
-        eprintln!("Wrote Byte {value:02x} to Debug-Out page {page}, offset {offset}");
+    fn write_byte(&self, addr: Addr, value: Byte) -> Result<(), MemoryExceptionType> {
+        eprintln!("Wrote Byte {value:02x} to Debug-Out address {addr:x}");
         Ok(())
     }
-
-    fn read_dword(&self, _page: PageNum, _offset: u16) -> Result<DWord, ExceptionType> {
-        Err(ExceptionType::LoadAccessFault)
-    }
-
-    fn read_word(&self, _page: PageNum, _offset: u16) -> Result<Word, ExceptionType> {
-        Err(ExceptionType::LoadAccessFault)
-    }
-
-    fn read_hword(&self, _page: PageNum, _offset: u16) -> Result<HWord, ExceptionType> {
-        Err(ExceptionType::LoadAccessFault)
-    }
-
-    fn read_byte(&self, _page: PageNum, _offset: u16) -> Result<Byte, ExceptionType> {
-        Err(ExceptionType::LoadAccessFault)
-    }
-
-    fn get_atomic_word(
-        &self,
-        _page: PageNum,
-        _offset: u16,
-    ) -> Result<&std::sync::atomic::AtomicU32, ExceptionType> {
-        Err(ExceptionType::StoreAmoAccessFault)
-    }
-
-    fn get_atomic_dword(
-        &self,
-        _page: PageNum,
-        _offset: u16,
-    ) -> Result<&std::sync::atomic::AtomicU64, ExceptionType> {
-        Err(ExceptionType::StoreAmoAccessFault)
-    }
 }