| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * Minimal LoongArch system boot code. |
| * |
| * Copyright (c) 2021 Loongson Technology Corporation Limited |
| */ |
| |
| #include "regdef.h" |
| |
| .global _start |
| .align 16 |
| _start: |
| la.local t0, stack_end |
| move sp, t0 |
| bl main |
| |
| .type _start 2 |
| .size _start, .-_start |
| |
| .global _exit |
| .align 16 |
| _exit: |
| 2: /* QEMU ACPI poweroff */ |
| li.w t0, 0x34 |
| li.w t1, 0x100e001c |
| st.b t0, t1, 0 |
| |
| idle 0 |
| bl 2b |
| |
| .type _exit 2 |
| .size _exit, .-_exit |
| |
| .global __sys_outc |
| __sys_outc: |
| li.d t1, 1000000 |
| loop: |
| lu12i.w t2, 0x1fe00 |
| ori t0, t2, 0x1e5 |
| ld.bu t0, t0, 0 |
| andi t0, t0, 0x20 |
| ext.w.b t0, t0 |
| bnez t0, in |
| addi.w t1, t1, -1 |
| bnez t1, loop |
| in: |
| ext.w.b a0, a0 |
| lu12i.w t0, 0x1fe00 |
| ori t0, t0, 0x1e0 |
| st.b a0, t0, 0 |
| jirl $r0, ra, 0 |
| |
| .data |
| .align 4 |
| stack: |
| .space 65536 |
| stack_end: |
