Initial commit

.cargo/config.toml

@@ -0,0 +1,5 @@
+[unstable]
+build-std = ["core", "compiler_builtins"]
+
+[build]
+target = "etc/aarch64-unknown-none-rpi3b.json"

.gitignore

@@ -0,0 +1 @@
+/target

Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "osdev4"
+version = "0.1.0"

Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "osdev4"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

etc/aarch64-unknown-none-rpi3b.json

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+{
+  "arch": "aarch64",
+  "data-layout": "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128",
+  "executables": true,
+  "linker": "rust-lld",
+  "linker-flavor": "ld.lld",
+  "linker-is-gnu": true,
+  "llvm-target": "aarch64-unknown-none",
+  "features": "+a53,+strict-align",
+  "max-atomic-width": 128,
+  "os": "none",
+  "panic-strategy": "abort",
+  "position-independent-executables": false,
+  "target-c-int-width": "32",
+  "target-endian": "little",
+  "target-pointer-width": "64",
+  "disable-redzone": true,
+  "pre-link-args": {
+    "ld.lld": [
+      "-Tetc/aarch64-unknown-none-rpi3b.ld"
+    ]
+  }
+}

etc/aarch64-unknown-none-rpi3b.ld

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+ENTRY(_entry);
+
+SECTIONS {
+    . = 0x80000;
+
+    .text : {
+        KEEP(*(.text.boot))
+        *(.text)
+    }
+
+    .rodata : {
+        *(.rodata)
+    }
+
+    .data : {
+        *(.data)
+    }
+
+    .bss : {
+        *(.bss)
+    }
+}

etc/gdbrc

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+symbol-file target/aarch64-unknown-none-rpi3b/debug/osdev4
+target remote :1234
+layout asm
+layout regs
+set scheduler-locking on

src/main.rs

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+#![feature(
+    global_asm,
+)]
+#![no_std]
+#![no_main]
+
+global_asm!(r#"
+.section .text.boot
+.global _entry
+_entry:
+    b .
+"#);
+
+use core::panic::PanicInfo;
+#[panic_handler]
+fn panic_handler(_pi: &PanicInfo) -> ! {
+    loop {}
+}