67 lines
1.8 KiB
Rust
67 lines
1.8 KiB
Rust
use std::ops::Index;
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use crate::emu::mmu::Memory;
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use crate::misc::emulator_error::DeviceType::RAM;
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use crate::misc::emulator_error::EmulatorError;
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use crate::misc::result::EmulatorResult;
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const MEM_LENGTH: usize = 2 << 24;
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#[derive(Clone, Debug)]
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pub struct RamMemory {
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data: Box<[u8; MEM_LENGTH]>,
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}
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impl RamMemory {
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pub fn try_new() -> EmulatorResult<RamMemory> {
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let alloc_result = vec![0; MEM_LENGTH].into_boxed_slice();
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let data = alloc_result.try_into().map_err(|err|{
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EmulatorError::AllocationFailure(RAM, "Allocation failed")
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})?;
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Ok(RamMemory {
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data
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})
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}
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}
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impl Memory for RamMemory {
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fn try_get_byte(&self, address: u32) -> EmulatorResult<u8> {
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log::trace!("Fetch RAM memory at address {}",address);
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let x = *self.data.get(address as usize).ok_or(EmulatorError::UnreachableMemory(RAM, address))?;
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Ok(x)
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}
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fn try_set_byte(&mut self, address: u32, value: u8) -> EmulatorResult<()> {
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if address>= MEM_LENGTH as u32 {
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return Err(EmulatorError::UnreachableMemory(RAM, address))
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}
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self.data[address as usize] = value;
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Ok(())
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}
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}
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#[cfg(test)]
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mod tests{
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use crate::emu::mem::RamMemory;
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use crate::emu::mmu::Memory;
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const EXAMPLE_ADDRESS:u32=0x24;
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#[test]
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pub fn get_mem(){
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let ram_result = RamMemory::try_new();
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assert!(ram_result.is_ok())
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}
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#[test]
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pub fn get_set_memory(){
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const EXAMPLE_DATA:u8 = 0xa5;
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let mut ram = RamMemory::try_new().unwrap();
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let byte_before = ram.try_get_byte(EXAMPLE_ADDRESS).unwrap();
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ram.try_set_byte(EXAMPLE_ADDRESS, EXAMPLE_DATA).unwrap();
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let byte_after = ram.try_get_byte(EXAMPLE_ADDRESS).unwrap();
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assert_eq!(0,byte_before);
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assert_eq!(EXAMPLE_DATA,byte_after);
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}
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} |