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-rw-r--r--arch/loongarch/kernel/switch.S37
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/loongarch/kernel/switch.S b/arch/loongarch/kernel/switch.S
new file mode 100644
index 000000000..202a163cb
--- /dev/null
+++ b/arch/loongarch/kernel/switch.S
@@ -0,0 +1,37 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#include <asm/asm.h>
+#include <asm/asmmacro.h>
+#include <asm/asm-offsets.h>
+#include <asm/loongarch.h>
+#include <asm/regdef.h>
+#include <asm/stackframe.h>
+#include <asm/thread_info.h>
+
+/*
+ * task_struct *__switch_to(task_struct *prev, task_struct *next,
+ * struct thread_info *next_ti)
+ */
+ .align 5
+SYM_FUNC_START(__switch_to)
+ csrrd t1, LOONGARCH_CSR_PRMD
+ stptr.d t1, a0, THREAD_CSRPRMD
+
+ cpu_save_nonscratch a0
+ stptr.d ra, a0, THREAD_REG01
+ stptr.d a3, a0, THREAD_SCHED_RA
+ stptr.d a4, a0, THREAD_SCHED_CFA
+ move tp, a2
+ cpu_restore_nonscratch a1
+
+ li.w t0, _THREAD_SIZE
+ PTR_ADD t0, t0, tp
+ set_saved_sp t0, t1, t2
+
+ ldptr.d t1, a1, THREAD_CSRPRMD
+ csrwr t1, LOONGARCH_CSR_PRMD
+
+ jr ra
+SYM_FUNC_END(__switch_to)