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| author | Steven Le Rouzic <steven.lerouzic@gmail.com> | 2024-05-13 12:21:59 +0200 |
|---|---|---|
| committer | Steven Le Rouzic <steven.lerouzic@gmail.com> | 2024-05-13 12:21:59 +0200 |
| commit | 9160f2912eb57910e45b681b7b5eef9acb6a922e (patch) | |
| tree | 2ec20d782cd5a05a2bebe2f6756456f1d4caa4d9 /os/boot.S | |
| parent | f95a85de0082010e4af83e26e99299d601bb48d6 (diff) | |
Diffstat (limited to 'os/boot.S')
| -rw-r--r-- | os/boot.S | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/os/boot.S b/os/boot.S new file mode 100644 index 0000000..afb966c --- /dev/null +++ b/os/boot.S @@ -0,0 +1,31 @@ +.option norvc
+
+.section .init
+
+.equ UART_BASE, 0x10000000
+
+.global kstart
+kstart:
+ la a0, _str
+ call _println
+
+_halt:
+ wfi
+ j _halt
+
+_println:
+ li t0, UART_BASE
+_println_loop:
+ lb t1, 0(a0)
+ beqz t1, _end_println_loop
+ sb t1, 0(t0)
+ addi a0, a0, 1
+ j _println_loop
+_end_println_loop:
+ li t1, '\n'
+ sb t1, 0(t0)
+ ret
+
+.section .rodata
+
+_str: .string "Hello, world!"
|