From 167631e253a1765fc1ce6c6fe4fff5f1d9667cc8 Mon Sep 17 00:00:00 2001
From: D4VID <d4vid@d4vid.xyz>
Date: Mon, 30 Dec 2024 22:46:57 +0100
Subject: [PATCH] Initial commit

---
 .cargo/config.toml |   8 ++++
 .gitignore         |   1 +
 Cargo.lock         | 116 +++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml         |   8 ++++
 memory.x           |  12 +++++
 src/main.rs        |  24 ++++++++++
 6 files changed, 169 insertions(+)
 create mode 100644 .cargo/config.toml
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 memory.x
 create mode 100644 src/main.rs

diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000..6dfb735
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,8 @@
+[build]
+target = "riscv32i-unknown-none-elf"
+
+[target.riscv32i-unknown-none-elf]
+rustflags = [
+  "-C", "link-arg=-Tmemory.x",
+  "-C", "link-arg=-Tlink.x",
+]
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/target
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..90a90c7
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,116 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "critical-section"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "790eea4361631c5e7d22598ecd5723ff611904e3344ce8720784c93e3d83d40b"
+
+[[package]]
+name = "embedded-hal"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "361a90feb7004eca4019fb28352a9465666b24f840f5c3cddf0ff13920590b89"
+
+[[package]]
+name = "lw-riscv"
+version = "0.1.0"
+dependencies = [
+ "riscv",
+ "riscv-rt",
+]
+
+[[package]]
+name = "paste"
+version = "1.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "57c0d7b74b563b49d38dae00a0c37d4d6de9b432382b2892f0574ddcae73fd0a"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.92"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37d3544b3f2748c54e147655edb5025752e2303145b5aefb3c3ea2c78b973bb0"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.38"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e4dccaaaf89514f546c693ddc140f729f958c247918a13380cccc6078391acc"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "riscv"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ea8ff73d3720bdd0a97925f0bf79ad2744b6da8ff36be3840c48ac81191d7a7"
+dependencies = [
+ "critical-section",
+ "embedded-hal",
+ "paste",
+ "riscv-macros",
+ "riscv-pac",
+]
+
+[[package]]
+name = "riscv-macros"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f265be5d634272320a7de94cea15c22a3bfdd4eb42eb43edc528415f066a1f25"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "riscv-pac"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8188909339ccc0c68cfb5a04648313f09621e8b87dc03095454f1a11f6c5d436"
+
+[[package]]
+name = "riscv-rt"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "753f1bd7eb4e0003cec5e2fb60ea8e253a71d0b041bc7d1ba0fffe22e3c0294d"
+dependencies = [
+ "riscv",
+ "riscv-pac",
+ "riscv-rt-macros",
+]
+
+[[package]]
+name = "riscv-rt-macros"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "30f19a85fe107b65031e0ba8ec60c34c2494069fe910d6c297f5e7cb5a6f76d0"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.93"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c786062daee0d6db1132800e623df74274a0a87322d8e183338e01b3d98d058"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adb9e6ca4f869e1180728b7950e35922a7fc6397f7b641499e8f3ef06e50dc83"
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a5e7838
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "lw-riscv"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+riscv = "0.12.1"
+riscv-rt = "0.13.0"
diff --git a/memory.x b/memory.x
new file mode 100644
index 0000000..741d469
--- /dev/null
+++ b/memory.x
@@ -0,0 +1,12 @@
+MEMORY
+{
+  RAM : ORIGIN = 0x10000000, LENGTH = 16K
+  FLASH : ORIGIN = 0x00000000, LENGTH = 256K
+}
+
+REGION_ALIAS("REGION_TEXT", FLASH);
+REGION_ALIAS("REGION_RODATA", FLASH);
+REGION_ALIAS("REGION_DATA", RAM);
+REGION_ALIAS("REGION_BSS", RAM);
+REGION_ALIAS("REGION_HEAP", RAM);
+REGION_ALIAS("REGION_STACK", RAM);
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..3a65e9d
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,24 @@
+#![no_std]
+#![no_main]
+
+use core::{panic::PanicInfo, ptr::write_volatile};
+use riscv::asm::nop;
+use riscv_rt::entry;
+
+#[panic_handler]
+fn panic_handler(_info: &PanicInfo) -> ! {
+    loop {}
+}
+
+#[entry]
+fn main() -> ! {
+    const MEM_ADDR: *mut u32 = 0x1000_0001 as *mut u32;
+    loop {
+        for i in 0..10 {
+            unsafe {
+                write_volatile(MEM_ADDR, 0b1101100+i);
+            }
+            nop();
+        }
+    }
+}