Initial commitHEADmaster

X86/X86_64 debug/release WORKING

riscv64 WORKING uart

idk

4 files changed, 68 insertions, 0 deletions

diff --git a/src/arch/riscv64/boot/entry.S b/src/arch/riscv64/boot/entry.S
new file mode 100644
index 0000000..f5fa092
--- /dev/null
+++ b/src/arch/riscv64/boot/entry.S
@@ -0,0 +1,37 @@
+.section .init
+
+.option norvc
+
+.type start, @function
+.global start
+start:
+	.cfi_startproc
+
+.option push
+.option norelax
+	la gp, global_pointer
+.option pop
+
+	/* Reset satp */
+	csrw satp, zero
+
+	/* Setup stack */
+	la sp, stack_top
+
+	/* Clear the BSS section */
+	la t5, bss_start
+	la t6, bss_end
+bss_clear:
+	sd zero, (t5)
+	addi t5, t5, 8
+	bltu t5, t6, bss_clear
+
+	la t0, kernel_main
+	csrw sepc, t0
+
+	/* Jump to kernel! */
+	tail kernel_main
+
+	.cfi_endproc
+
+.end
diff --git a/src/arch/riscv64/io/mod.rs b/src/arch/riscv64/io/mod.rs
new file mode 100644
index 0000000..6d91cab
--- /dev/null
+++ b/src/arch/riscv64/io/mod.rs
@@ -0,0 +1,2 @@
+mod uart;
+pub use uart::*;
diff --git a/src/arch/riscv64/io/uart.rs b/src/arch/riscv64/io/uart.rs
new file mode 100644
index 0000000..7aafeef
--- /dev/null
+++ b/src/arch/riscv64/io/uart.rs
@@ -0,0 +1,27 @@
+use core::fmt;
+use core::fmt::Write;
+
+pub fn _print(args: fmt::Arguments) {
+    // Not thread safe but no dependencies
+    let mut stdout = Stdout;
+    fmt::write(&mut stdout, args);
+}
+
+struct Stdout;
+impl Write for Stdout {
+    fn write_str(&mut self, s: &str) -> fmt::Result {
+        print_string(s);
+        Ok(())
+    }
+}
+
+pub fn print_string(s: &str) {
+    let uart_base = 0x10000000 as *mut u8;
+    while unsafe { uart_base.add(5).read_volatile() } & 0x20 == 0 {}
+
+    for c in s.chars() {
+        unsafe {
+            uart_base.write_volatile(c as u8);
+        }
+    }
+}
diff --git a/src/arch/riscv64/mod.rs b/src/arch/riscv64/mod.rs
new file mode 100644
index 0000000..608d4e1
--- /dev/null
+++ b/src/arch/riscv64/mod.rs
@@ -0,0 +1,2 @@
+mod io;
+pub use io::*;