From 13a1a39c91361819c07c82c9674d119531fdd3e2 Mon Sep 17 00:00:00 2001 From: Isabelle L Date: Wed, 10 Jun 2020 02:01:50 -0500 Subject: [PATCH] changes to registers and addition of memory module --- Cargo.lock | 698 +++++++++++++++++++++++++++++++++++++++++++++-- Cargo.toml | 2 +- README.md | 22 +- src/cpu.rs | 106 ------- src/lib.rs | 15 +- src/main.rs | 3 +- src/memory.rs | 10 + src/registers.rs | 119 ++++++++ 8 files changed, 842 insertions(+), 133 deletions(-) delete mode 100644 src/cpu.rs create mode 100644 src/memory.rs create mode 100644 src/registers.rs diff --git a/Cargo.lock b/Cargo.lock index 7bd1a40..881207d 100644 --- a/Cargo.lock +++ b/Cargo.lock @@ -1,16 +1,98 @@ # This file is automatically @generated by Cargo. # It is not intended for manual editing. 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b/README.md index fdd1355..7d33e6c 100644 --- a/README.md +++ b/README.md @@ -1,2 +1,22 @@ # Ceres -### a shitty fantasy console written in rust usng a proprietary asm instruction set \ No newline at end of file +a shitty fantasy console written in rust using a proprietary MIPS based asm instruction set. a bit of inspiration from PICO-8 + +### GRAPHICS + +uhhhhh funny 128x72 screen + +### Register layout and info + +all registers are unsigned 16 bit + +| Register number | Register name | Register usage | +| --------------- | ------------- | -------------------- | +| 0 | z0 | always contains zero | +| 1 | gp | global pointer | +| 2 | gp | stack pointer | +| 3 | ra | return address | +| 4-6 | a0-a2 | argument registers | +| 7 | v0 | return register | +| 8 | v1 | return register 2 | +| 9-15 | t0-t6 | temporary registers | + diff --git a/src/cpu.rs b/src/cpu.rs deleted file mode 100644 index da1a71d..0000000 --- a/src/cpu.rs +++ /dev/null @@ -1,106 +0,0 @@ -/// 16 register cpu only capable of holding 16 bit unsigned integers -pub struct Cpu { - // zero register - z0: u16, - - // system registers - sp: u16, - ra: u16, - - // argument registers - a0: u16, - a1: u16, - a2: u16, - - // return registers - v0: u16, - v1: u16, - - // temp registers - t0: u16, - t1: u16, - t2: u16, - t3: u16, - t4: u16, - t5: u16, - t6: u16, - t7: u16, -} - -/// initializes cpu with 0x00 in all registers -impl Default for Cpu { - fn default() -> Self { - Cpu { - z0: 0, - sp: 0, - ra: 0, - a0: 0, - a1: 0, - a2: 0, - v0: 0, - v1: 0, - t0: 0, - t1: 0, - t2: 0, - t3: 0, - t4: 0, - t5: 0, - t6: 0, - t7: 0, - } - } -} - -/// indexes registers by register number and returns reference to the registers -/// contents -impl std::ops::Index for Cpu { - type Output = u16; - - fn index(&self, idx: usize) -> &u16 { - match idx { - 0 => &self.z0, - 1 => &self.sp, - 2 => &self.ra, - 3 => &self.a0, - 4 => &self.a1, - 5 => &self.a2, - 6 => &self.v0, - 7 => &self.v1, - 8 => &self.t0, - 9 => &self.t1, - 10 => &self.t2, - 11 => &self.t3, - 12 => &self.t4, - 13 => &self.t5, - 14 => &self.t6, - 15 => &self.t7, - _ => panic!("Invalid register number"), - } - } -} - -/// indexes registers by register number and returns mutable reference to the -/// registers contents -impl std::ops::IndexMut for Cpu { - fn index_mut(&mut self, idx: usize) -> &mut u16 { - match idx { - 0 => &mut self.z0, - 1 => &mut self.sp, - 2 => &mut self.ra, - 3 => &mut self.a0, - 4 => &mut self.a1, - 5 => &mut self.a2, - 6 => &mut self.v0, - 7 => &mut self.v1, - 8 => &mut self.t0, - 9 => &mut self.t1, - 10 => &mut self.t2, - 11 => &mut self.t3, - 12 => &mut self.t4, - 13 => &mut self.t5, - 14 => &mut self.t6, - 15 => &mut self.t7, - _ => panic!("Invalid register number"), - } - } -} diff --git a/src/lib.rs b/src/lib.rs index 9428a88..555055a 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -1,7 +1,16 @@ -pub mod cpu; +mod memory; +mod registers; -use cpu::Cpu; +pub use memory::Memory; +pub use registers::Registers; pub struct System { - cpu: Cpu, + pub registers: Registers, + pub memory: Memory, +} + +impl System { + pub fn init() -> System { + System { registers: Registers::init(), memory: Memory::init() } + } } diff --git a/src/main.rs b/src/main.rs index e7a11a9..b9096d5 100644 --- a/src/main.rs +++ b/src/main.rs @@ -1,3 +1,4 @@ fn main() { - println!("Hello, world!"); + let sys = ceres::System::init(); + println!("{}", sys.registers); } diff --git a/src/memory.rs b/src/memory.rs new file mode 100644 index 0000000..34244a0 --- /dev/null +++ b/src/memory.rs @@ -0,0 +1,10 @@ +/// all the memory as one big fat fucking slice +pub struct Memory { + pub data: [u16; std::u16::MAX as usize], +} + +impl Memory { + pub fn init() -> Memory { + Memory { data: [0x00; std::u16::MAX as usize] } + } +} diff --git a/src/registers.rs b/src/registers.rs new file mode 100644 index 0000000..fe15578 --- /dev/null +++ b/src/registers.rs @@ -0,0 +1,119 @@ +use std::fmt; + +/// 16 register cpu only capable of holding 16 bit unsigned integers +pub struct Registers { + // zero register + z0: u16, + + // system registers + gp: u16, + sp: u16, + ra: u16, + + // argument registers + a0: u16, + a1: u16, + a2: u16, + + // return registers + v0: u16, + v1: u16, + + // temp registers + t0: u16, + t1: u16, + t2: u16, + t3: u16, + t4: u16, + t5: u16, + t6: u16, +} + +impl Registers { + /// initializes cpu with 0x00 in all registers + pub fn init() -> Registers { + Registers { + z0: 0x00, + gp: 0x00, + sp: 0x00, + ra: 0x00, + a0: 0x00, + a1: 0x00, + a2: 0x00, + v0: 0x00, + v1: 0x00, + t0: 0x00, + t1: 0x00, + t2: 0x00, + t3: 0x00, + t4: 0x00, + t5: 0x00, + t6: 0x00, + } + } +} + +/// indexes registers by register number and returns reference to the registers +/// contents +impl std::ops::Index for Registers { + type Output = u16; + + fn index(&self, idx: usize) -> &u16 { + match idx { + 0 => &self.z0, + 1 => &self.gp, + 2 => &self.sp, + 3 => &self.ra, + 4 => &self.a0, + 5 => &self.a1, + 6 => &self.a2, + 7 => &self.v0, + 8 => &self.v1, + 9 => &self.t0, + 10 => &self.t1, + 11 => &self.t2, + 12 => &self.t3, + 13 => &self.t4, + 14 => &self.t5, + 15 => &self.t6, + _ => panic!("Invalid register number"), + } + } +} + +/// indexes registers by register number and returns mutable reference to the +/// registers contents +impl std::ops::IndexMut for Registers { + fn index_mut(&mut self, idx: usize) -> &mut u16 { + match idx { + 0 => &mut self.z0, + 1 => &mut self.gp, + 2 => &mut self.sp, + 3 => &mut self.ra, + 4 => &mut self.a0, + 5 => &mut self.a1, + 6 => &mut self.a2, + 7 => &mut self.v0, + 8 => &mut self.v1, + 9 => &mut self.t0, + 10 => &mut self.t1, + 11 => &mut self.t2, + 12 => &mut self.t3, + 13 => &mut self.t4, + 14 => &mut self.t5, + 15 => &mut self.t6, + _ => panic!("Invalid register number"), + } + } +} + +impl fmt::Display for Registers { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + write!(f, "-- registers ----------------------------------------------------------------------------\n\ +| z0: 0x{:02X} | gp: 0x{:02X} | sp: 0x{:02X} | ra: 0x{:02X} | a0: 0x{:02X} | a1: 0x{:02X} | a2: 0x{:02X} | v0: 0x{:02X} |\n\ +| v1: 0x{:02X} | t0: 0x{:02X} | t1: 0x{:02X} | t2: 0x{:02X} | t3: 0x{:02X} | t4: 0x{:02X} | t5: 0x{:02X} | t6: 0x{:02X} |\n\ +-----------------------------------------------------------------------------------------", + self[0], self[1], self[2], self[3], self[4], self[5], self[6], self[7], + self[8], self[9], self[10], self[11], self[12], self[13], self[14], self[15]) + } +}