LXR qemu/tests/tcg/loongarch64/system/boot.S

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * Minimal LoongArch system boot code.
   4 *
   5 * Copyright (c) 2021 Loongson Technology Corporation Limited
   6 */
   7
   8#include "regdef.h"
   9
  10        .global _start
  11        .align 16
  12_start:
  13        la.local t0, stack_end
  14        move sp, t0
  15        bl main
  16
  17        .type _start 2
  18        .size _start, .-_start
  19
  20        .global _exit
  21        .align 16
  22_exit:
  232:      /* QEMU ACPI poweroff */
  24        li.w  t0, 0xff
  25        li.w  t1, 0x10080010
  26        st.w  t0, t1, 0
  27        idle  0
  28        bl    2b
  29
  30        .type _exit 2
  31        .size _exit, .-_exit
  32
  33        .global __sys_outc
  34__sys_outc:
  35        li.d t1, 1000000
  36loop:
  37        lu12i.w t2, 0x1fe00
  38        ori     t0, t2, 0x1e5
  39        ld.bu   t0, t0, 0
  40        andi    t0, t0, 0x20
  41        ext.w.b t0, t0
  42        bnez    t0, in
  43        addi.w  t1, t1, -1
  44        bnez    t1, loop
  45in:
  46        ext.w.b a0, a0
  47        lu12i.w t0, 0x1fe00
  48        ori     t0, t0, 0x1e0
  49        st.b    a0, t0, 0
  50        jirl    $r0, ra, 0
  51
  52        .data
  53        .align 4
  54stack:
  55        .space  65536
  56stack_end:
  57