LoongArch: Add exception/interrupt handling

Add the exception and interrupt handling machanism for basic LoongArch
support.

Reviewed-by: WANG Xuerui <git@xen0n.name>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

1 files changed, 27 insertions, 0 deletions

diff --git a/arch/loongarch/include/asm/irq_regs.h b/arch/loongarch/include/asm/irq_regs.h
new file mode 100644
index 000000000000..3d62d815bf6b
--- /dev/null
+++ b/arch/loongarch/include/asm/irq_regs.h
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+#ifndef __ASM_IRQ_REGS_H
+#define __ASM_IRQ_REGS_H
+
+#define ARCH_HAS_OWN_IRQ_REGS
+
+#include <linux/thread_info.h>
+
+static inline struct pt_regs *get_irq_regs(void)
+{
+	return current_thread_info()->regs;
+}
+
+static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs)
+{
+	struct pt_regs *old_regs;
+
+	old_regs = get_irq_regs();
+	current_thread_info()->regs = new_regs;
+
+	return old_regs;
+}
+
+#endif /* __ASM_IRQ_REGS_H */