Hotfix to previous commit

theseus/src/kmain.rs

@@ -4,7 +4,7 @@ extern "C" {
 	fn cpuid() -> u64;
 	fn consoleinit();
 	fn printfinit();
-	// fn printf();
+	fn printf(msg: *const i8);
 	fn kinit();
 	fn kvminit();
 	fn kvminithart();
@@ -27,9 +27,9 @@ pub unsafe fn kmain() {
 	if cpuid() == 0 {
 		consoleinit();
 		printfinit();
-		// printf("\n");
-		// printf("xv6 kernel is booting\n");
-		// printf("\n");
+		printf(c"\n".as_ptr());
+		printf(c"xv6 kernel is booting\n".as_ptr());
+		printf(c"\n".as_ptr());
 		kinit(); // physical page allocator
 		kvminit(); // create kernel page table
 		kvminithart(); // turn on paging

theseus/src/lib.rs

@@ -1,6 +1,8 @@
 #![no_std]
 #![crate_type = "staticlib"]
 
+use core::ffi::CStr;
+
 pub mod kmain;
 pub mod memlayout;
 pub mod param;
@@ -11,17 +13,16 @@ pub mod uart;
 
 extern "C" {
 	// printf.c
-	fn panic(s: *const u8);
+	fn panic(s: *const i8);
 }
 
-/// '!RUST PANIC!\0'
-static PANIC_MSG: [u8; 13] = [33, 82, 85, 83, 84, 32, 80, 65, 78, 73, 67, 33, 0];
+static PANIC_MSG: &CStr = c"!RUST PANIC!";
 
 #[panic_handler]
 #[no_mangle]
 fn panic_handler(_info: &core::panic::PanicInfo) -> ! {
 	unsafe {
-		panic(core::ptr::addr_of!(PANIC_MSG[0]));
+		panic(PANIC_MSG.as_ptr());
 	}
 	loop {}
 }

theseus/src/spinlock.rs

@@ -6,12 +6,12 @@ pub struct SpinLock {
 	// Is the lock held?
 	pub locked: u32, // C boolean
 	// For debugging:
-	pub name: *const u8, // Name of lock.
+	pub name: *const i8, // Name of lock.
 	pub cpu: *mut (),    // The cpu holding the lock.
 }
 
 #[no_mangle]
-pub unsafe extern "C" fn initlock(lock: *mut SpinLock, name: *const u8) {
+pub unsafe extern "C" fn initlock(lock: *mut SpinLock, name: *const i8) {
 	(*lock).name = name;
 	(*lock).locked = 0;
 	(*lock).cpu = null_mut();

theseus/src/uart.rs

@@ -2,7 +2,10 @@ use crate::{
 	memlayout::UART0,
 	spinlock::{initlock, SpinLock},
 };
-use core::ptr::{addr_of_mut, null, null_mut};
+use core::{
+	ffi::CStr,
+	ptr::{addr_of_mut, null, null_mut},
+};
 
 extern "C" {
 	// spinlock.c
@@ -66,8 +69,7 @@ static mut uart_tx_lock: crate::spinlock::SpinLock = crate::spinlock::SpinLock {
 	name: null(),
 };
 
-// NOTE: string 'uart\0' for c-implmentation of spinlock. Stupid but works.
-static UART_LOCK_NAME: [u8; 5] = [0x75, 0x61, 0x72, 0x74, 0];
+static UART_LOCK_NAME: &CStr = c"uart";
 
 const UART_TX_BUF_SIZE: usize = 32;
 static mut uart_tx_buf: [u8; UART_TX_BUF_SIZE] = [0; UART_TX_BUF_SIZE];