1 files changed, 106 insertions, 0 deletions
diff --git a/arch/loongarch/include/asm/thread_info.h b/arch/loongarch/include/asm/thread_info.h
new file mode 100644
index 000000000000..4d7117fcdc78
--- /dev/null
+++ b/arch/loongarch/include/asm/thread_info.h
@@ -0,0 +1,106 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * thread_info.h: LoongArch low-level thread information
+ *
+ * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
+ */
+
+#ifndef _ASM_THREAD_INFO_H
+#define _ASM_THREAD_INFO_H
+
+#ifdef __KERNEL__
+
+#ifndef __ASSEMBLER__
+
+#include <asm/processor.h>
+
+/*
+ * low level task data that entry.S needs immediate access to
+ * - this struct should fit entirely inside of one cache line
+ * - this struct shares the supervisor stack pages
+ * - if the contents of this structure are changed, the assembly constants
+ *   must also be changed
+ */
+struct thread_info {
+	struct task_struct	*task;		/* main task structure */
+	unsigned long		flags;		/* low level flags */
+	unsigned long		tp_value;	/* thread pointer */
+	__u32			cpu;		/* current CPU */
+	int			preempt_count;	/* 0 => preemptible, <0 => BUG */
+	struct pt_regs		*regs;
+	unsigned long		syscall;	/* syscall number */
+	unsigned long		syscall_work;	/* SYSCALL_WORK_ flags */
+};
+
+/*
+ * macros/functions for gaining access to the thread information structure
+ */
+#define INIT_THREAD_INFO(tsk)			\
+{						\
+	.task		= &tsk,			\
+	.flags		= _TIF_FIXADE,		\
+	.cpu		= 0,			\
+	.preempt_count	= INIT_PREEMPT_COUNT,	\
+}
+
+/* How to get the thread information struct from C. */
+register struct thread_info *__current_thread_info __asm__("$tp");
+
+static inline struct thread_info *current_thread_info(void)
+{
+	return __current_thread_info;
+}
+
+register unsigned long current_stack_pointer __asm__("$sp");
+
+#endif /* !__ASSEMBLER__ */
+
+/* thread information allocation */
+#define THREAD_SIZE		SZ_16K
+#define THREAD_MASK		(THREAD_SIZE - 1UL)
+#define THREAD_SIZE_ORDER	ilog2(THREAD_SIZE / PAGE_SIZE)
+/*
+ * thread information flags
+ * - these are process state flags that various assembly files may need to
+ *   access
+ * - pending work-to-be-done flags are in LSW
+ * - other flags in MSW
+ *
+ * Tell the generic TIF infrastructure which special bits loongarch supports
+ */
+#define HAVE_TIF_NEED_RESCHED_LAZY
+#define HAVE_TIF_RESTORE_SIGMASK
+
+#include <asm-generic/thread_info_tif.h>
+
+/* Architecture specific bits */
+#define TIF_NOHZ		16	/* in adaptive nohz mode */
+#define TIF_USEDFPU		17	/* FPU was used by this task this quantum (SMP) */
+#define TIF_USEDSIMD		18	/* SIMD has been used this quantum */
+#define TIF_FIXADE		19	/* Fix address errors in software */
+#define TIF_LOGADE		20	/* Log address errors to syslog */
+#define TIF_32BIT_REGS		21	/* 32-bit general purpose registers */
+#define TIF_32BIT_ADDR		22	/* 32-bit address space */
+#define TIF_LOAD_WATCH		23	/* If set, load watch registers */
+#define TIF_SINGLESTEP		24	/* Single Step */
+#define TIF_LSX_CTX_LIVE	25	/* LSX context must be preserved */
+#define TIF_LASX_CTX_LIVE	26	/* LASX context must be preserved */
+#define TIF_USEDLBT		27	/* LBT was used by this task this quantum (SMP) */
+#define TIF_LBT_CTX_LIVE	28	/* LBT context must be preserved */
+
+#define _TIF_NOHZ		BIT(TIF_NOHZ)
+#define _TIF_USEDFPU		BIT(TIF_USEDFPU)
+#define _TIF_USEDSIMD		BIT(TIF_USEDSIMD)
+#define _TIF_FIXADE		BIT(TIF_FIXADE)
+#define _TIF_LOGADE		BIT(TIF_LOGADE)
+#define _TIF_32BIT_REGS		BIT(TIF_32BIT_REGS)
+#define _TIF_32BIT_ADDR		BIT(TIF_32BIT_ADDR)
+#define _TIF_LOAD_WATCH		BIT(TIF_LOAD_WATCH)
+#define _TIF_SINGLESTEP		BIT(TIF_SINGLESTEP)
+#define _TIF_LSX_CTX_LIVE	BIT(TIF_LSX_CTX_LIVE)
+#define _TIF_LASX_CTX_LIVE	BIT(TIF_LASX_CTX_LIVE)
+#define _TIF_USEDLBT		BIT(TIF_USEDLBT)
+#define _TIF_LBT_CTX_LIVE	BIT(TIF_LBT_CTX_LIVE)
+
+#endif /* __KERNEL__ */
+#endif /* _ASM_THREAD_INFO_H */