VERY SAFE TESTING and also runner is not needed for now

kernel/.cargo/config.toml

@@ -8,6 +8,7 @@ rustflags = [
     "-C", "link-arg=-Tsrc/arch/riscv64/link.ld",
     "-C", "link-arg=--omagic",
 ]
+runner = "qemu-system-riscv64 -nographic -semihosting -cpu rv64 -machine virt -bios none -smp 4 -m 1G -kernel"
 
 [unstable]
 build-std = ["core", "compiler_builtins", "alloc"]

kernel/Cargo.lock

@@ -2,116 +2,6 @@
 # It is not intended for manual editing.
 version = 3
 
-[[package]]
-name = "bit_field"
-version = "0.10.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc827186963e592360843fb5ba4b973e145841266c1357f7180c43526f2e5b61"
-
-[[package]]
-name = "bitflags"
-version = "1.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
-
-[[package]]
-name = "bitflags"
-version = "2.4.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ed570934406eb16438a4e976b1b4500774099c13b8cb96eec99f620f05090ddf"
-
-[[package]]
-name = "bootloader_api"
-version = "0.11.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "daaa1fb791aea49e19db7b7b3662665d511eb4e30a0627fa525fd92652f39358"
-
 [[package]]
 name = "kernel"
 version = "0.1.0"
-dependencies = [
- "bootloader_api",
- "lazy_static",
- "pic8259",
- "uart_16550",
- "x86_64",
-]
-
-[[package]]
-name = "lazy_static"
-version = "1.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
-dependencies = [
- "spin",
-]
-
-[[package]]
-name = "pic8259"
-version = "0.10.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cb844b5b01db1e0b17938685738f113bfc903846f18932b378bc0eabfa40e194"
-dependencies = [
- "x86_64",
-]
-
-[[package]]
-name = "raw-cpuid"
-version = "10.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6c297679cb867470fa8c9f67dbba74a78d78e3e98d7cf2b08d6d71540f797332"
-dependencies = [
- "bitflags 1.3.2",
-]
-
-[[package]]
-name = "rustversion"
-version = "1.0.14"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7ffc183a10b4478d04cbbbfc96d0873219d962dd5accaff2ffbd4ceb7df837f4"
-
-[[package]]
-name = "spin"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6e63cff320ae2c57904679ba7cb63280a3dc4613885beafb148ee7bf9aa9042d"
-
-[[package]]
-name = "uart_16550"
-version = "0.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6dc00444796f6c71f47c85397a35e9c4dbf9901902ac02386940d178e2b78687"
-dependencies = [
- "bitflags 1.3.2",
- "rustversion",
- "x86",
-]
-
-[[package]]
-name = "volatile"
-version = "0.4.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "442887c63f2c839b346c192d047a7c87e73d0689c9157b00b53dcc27dd5ea793"
-
-[[package]]
-name = "x86"
-version = "0.52.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2781db97787217ad2a2845c396a5efe286f87467a5810836db6d74926e94a385"
-dependencies = [
- "bit_field",
- "bitflags 1.3.2",
- "raw-cpuid",
-]
-
-[[package]]
-name = "x86_64"
-version = "0.14.11"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b835097a84e4457323331ec5d6eb23d096066cbfb215d54096dcb4b2e85f500"
-dependencies = [
- "bit_field",
- "bitflags 2.4.2",
- "rustversion",
- "volatile",
-]

kernel/Cargo.toml

@@ -3,26 +3,15 @@ name = "kernel"
 version = "0.1.0"
 edition = "2021"
 
-[[bin]]
-name = "kernel"
-test = false
-bench = false
-
 [dependencies]
 
-[target.'cfg(target_arch = "x86_64")'.dependencies]
-pic8259 = "0.10.1"
-bootloader_api = "0.11.5"
-x86_64 = "0.14.11"
-uart_16550 = "0.3.0"
-
-[dependencies.lazy_static]
-version = "1.4.0"
-features = ["spin_no_std"]
-
-[profile.dev]
-panic = "abort"
-
-[profile.release]
-panic = "abort"
+# [target.'cfg(target_arch = "x86_64")'.dependencies]
+# pic8259 = "0.10.1"
+# bootloader_api = "0.11.5"
+# x86_64 = "0.14.11"
+# uart_16550 = "0.3.0"
+#
+# [dependencies.lazy_static]
+# version = "1.4.0"
+# features = ["spin_no_std"]
 

kernel/src/arch/riscv64/init.rs

@@ -3,7 +3,7 @@ use core::{arch::asm, ops::Range};
 use crate::{
     arch::{asm, csr, interrupts, paging, wait},
     fdt::FDT,
-    main,
+    start,
 };
 
 #[no_mangle]
@@ -70,5 +70,5 @@ pub unsafe fn init() -> ! {
         end: raw_mem_range.end(),
     };
     to_supervisor();
-    main(heap_mem, fdt);
+    start(heap_mem, fdt)
 }

kernel/src/arch/riscv64/interrupts.rs

@@ -8,5 +8,5 @@ pub fn init() {
 pub fn stuff() -> ! {
     let mcause = csr::mcause::read();
     crate::println!("interrupt triggered: {mcause:?}");
-    super::qemu::exit();
+    super::qemu::exit(1);
 }

kernel/src/arch/riscv64/qemu.rs

@@ -1,6 +1,7 @@
 use core::fmt::{self, Write};
 
 use crate::util::mutex::Mutex;
+use core::arch::asm;
 
 // --machine sifive_u
 // const UART_BASE: u32 = 0x10010000;
@@ -28,22 +29,27 @@ impl fmt::Write for Uart {
     }
 }
 
-pub fn exit() -> ! {
+pub fn exit(code: usize) -> ! {
+    let data = [0x20026, code];
     unsafe {
-        core::arch::asm!(
-            "li t0, 0x20026",
-            "sw t0, 0(sp)",
-            "move a1, sp",
-            "li a0, 0x18",
+        semihost(0x18, data.as_ptr() as *const u8);
+    }
+    super::wait()
+}
+
+unsafe fn semihost(call: usize, data: *const u8) {
+    asm!(
+        "mv a0, {call}",
+        "mv a1, {data}",
         ".balign 16",
         ".option push",
         ".option norvc",
         "slli zero, zero, 0x1f",
         "ebreak",
         "srai zero, zero, 0x7",
-            options(noreturn)
-        );
-    }
+        call = in(reg) call,
+        data = in(reg) data
+    )
 }
 
 pub fn _print(args: core::fmt::Arguments<'_>) {

kernel/src/main.rs

@@ -3,12 +3,13 @@
 #![feature(abi_x86_interrupt)]
 #![feature(naked_functions)]
 #![feature(fn_align)]
-
-use core::ops::Range;
-
-use fdt::FDT;
+#![feature(custom_test_frameworks)]
+#![test_runner(crate::test::test_runner)]
+#![reexport_test_harness_main = "test_main"]
 
 use crate::allocator::ALLOCATOR;
+use core::ops::Range;
+use fdt::FDT;
 
 extern crate alloc;
 
@@ -19,9 +20,19 @@ pub mod fdt;
 pub mod heap;
 pub mod log;
 pub mod qemu;
+#[cfg(test)]
+mod test;
 pub mod util;
 
-pub fn main(heap_mem: Range<*mut u8>, fdt: FDT) -> ! {
+pub fn start(heap_mem: Range<*mut u8>, fdt: FDT) -> ! {
+    #[cfg(test)]
+    test_main();
+    #[cfg(not(test))]
+    main(heap_mem, fdt);
+    qemu::exit(0)
+}
+
+pub fn main(heap_mem: Range<*mut u8>, fdt: FDT) {
     println!("we out here vibin");
     println!("memory range: {:?}", fdt.mem_range());
     for node in &fdt {}
@@ -57,11 +68,17 @@ pub fn main(heap_mem: Range<*mut u8>, fdt: FDT) -> ! {
     // for _ in 0..40000000 {}
     // let x = unsafe { *(0x10000000000 as *mut u8) };
     // println!("we got {x}");
-    qemu::exit();
 }
 
 #[panic_handler]
 pub fn panic(info: &core::panic::PanicInfo) -> ! {
-    println!("{}", info);
-    qemu::exit()
+    #[cfg(test)]
+    crate::test::test_panic(info);
+    #[cfg(not(test))]
+    main_panic(info);
+}
+
+pub fn main_panic(info: &core::panic::PanicInfo) -> ! {
+    println!("{}", info);
+    qemu::exit(1);
 }

kernel/src/test.rs

@@ -0,0 +1,69 @@
+use crate::{print, println, qemu};
+
+// SURELY I will not have threading tests that cause problems
+// SURELY I don't need to pin the input to test_runner
+static mut TESTS: &[&dyn Testable] = &[];
+static mut TEST: usize = 0;
+static mut FAILED: usize = 0;
+
+pub trait Testable {
+    fn run(&self) -> ();
+}
+
+impl<T: Fn()> Testable for T {
+    fn run(&self) {
+        print!("test {}... ", core::any::type_name::<T>());
+        self();
+        println!("\x1b[92mok\x1b[0m");
+    }
+}
+
+pub fn test_runner(tests: &[&dyn Testable]) {
+    unsafe { TESTS = core::mem::transmute(tests) };
+    println!("Running {} tests", tests.len());
+    run_tests();
+}
+
+pub fn run_tests() -> ! {
+    unsafe {
+        for i in TEST..TESTS.len() {
+            let test = TESTS[i];
+            TEST += 1;
+            test.run();
+        }
+        print!(
+            "results: {}. {} passed; {} failed",
+            if FAILED > 0 {
+                "\x1b[91mFAILED\x1b[0m"
+            } else {
+                "\x1b[92mok\x1b[0m"
+            },
+            TEST - FAILED,
+            FAILED
+        );
+    }
+    println!();
+    qemu::exit(0)
+}
+
+pub fn test_panic(info: &core::panic::PanicInfo) -> ! {
+    println!("\x1b[91mFAILED\x1b[0m");
+    println!("\x1b[93m{}\x1b[0m", info);
+    unsafe { FAILED += 1 };
+    run_tests();
+}
+
+#[test_case]
+fn test1() {
+    assert_eq!(1, 1);
+}
+
+#[test_case]
+fn test2() {
+    assert_eq!(1, 0);
+}
+
+#[test_case]
+fn test3() {
+    assert_eq!(5, 4);
+}

runner/src/main.rs

@@ -2,8 +2,8 @@ use clap::Parser;
 use std::process::{self, Command, Stdio};
 use target::Target;
 
-mod boot;
-mod target;
+pub mod boot;
+pub mod target;
 
 #[derive(Parser)]
 #[command(author, version, about, long_about = None)]
@@ -20,7 +20,7 @@ fn main() {
     let args = Args::parse();
     let target = args.target.unwrap_or(Target::default());
     std::env::set_current_dir("../kernel").expect("uh oh");
-    build(&target);
+    build(&target, false);
     run_qemu(&target, args.gdb);
 }
 
@@ -51,10 +51,14 @@ fn run_qemu(target: &Target, gdb: Option<Option<u16>>) {
     }
 }
 
-fn build(target: &Target) {
+fn build(target: &Target, test: bool) {
     let mut cargo = Command::new("cargo");
+    if test {
+        cargo.arg("test");
+        cargo.arg("--no-run");
+    } else {
         cargo.arg("build");
-    cargo.args(["--package", "kernel"]);
+    }
     cargo.args(["--target", target.rust_target()]);
     let status = cargo.status().expect("uh oh");
     if !status.success() {
@@ -64,3 +68,16 @@ fn build(target: &Target) {
         boot::build_bootloader_img(bootloader);
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use crate::{build, run_qemu, target::Target};
+
+    #[test]
+    fn default() {
+        std::env::set_current_dir("../kernel").expect("uh oh");
+        let target = Target::default();
+        build(&target, true);
+        run_qemu(&target, None);
+    }
+}