1 files changed, 112 insertions, 0 deletions
diff --git a/arch/alpha/include/asm/thread_info.h b/arch/alpha/include/asm/thread_info.h
new file mode 100644
index 000000000..084c27cb0
--- /dev/null
+++ b/arch/alpha/include/asm/thread_info.h
@@ -0,0 +1,112 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ALPHA_THREAD_INFO_H
+#define _ALPHA_THREAD_INFO_H
+
+#ifdef __KERNEL__
+
+#ifndef __ASSEMBLY__
+#include <asm/processor.h>
+#include <asm/types.h>
+#include <asm/hwrpb.h>
+#include <asm/sysinfo.h>
+#endif
+
+#ifndef __ASSEMBLY__
+struct thread_info {
+	struct pcb_struct	pcb;		/* palcode state */
+
+	struct task_struct	*task;		/* main task structure */
+	unsigned int		flags;		/* low level flags */
+	unsigned int		ieee_state;	/* see fpu.h */
+
+	unsigned		cpu;		/* current CPU */
+	int			preempt_count; /* 0 => preemptable, <0 => BUG */
+	unsigned int		status;		/* thread-synchronous flags */
+
+	int bpt_nsaved;
+	unsigned long bpt_addr[2];		/* breakpoint handling  */
+	unsigned int bpt_insn[2];
+};
+
+/*
+ * Macros/functions for gaining access to the thread information structure.
+ */
+#define INIT_THREAD_INFO(tsk)			\
+{						\
+	.task		= &tsk,			\
+	.preempt_count	= INIT_PREEMPT_COUNT,	\
+}
+
+/* How to get the thread information struct from C.  */
+register struct thread_info *__current_thread_info __asm__("$8");
+#define current_thread_info()  __current_thread_info
+
+#endif /* __ASSEMBLY__ */
+
+/* Thread information allocation.  */
+#define THREAD_SIZE_ORDER 1
+#define THREAD_SIZE (2*PAGE_SIZE)
+
+/*
+ * Thread information flags:
+ * - these are process state flags and used from assembly
+ * - pending work-to-be-done flags come first and must be assigned to be
+ *   within bits 0 to 7 to fit in and immediate operand.
+ *
+ * TIF_SYSCALL_TRACE is known to be 0 via blbs.
+ */
+#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
+#define TIF_NOTIFY_RESUME	1	/* callback before returning to user */
+#define TIF_SIGPENDING		2	/* signal pending */
+#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
+#define TIF_SYSCALL_AUDIT	4	/* syscall audit active */
+#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
+#define TIF_DIE_IF_KERNEL	9	/* dik recursion lock */
+#define TIF_MEMDIE		13	/* is terminating due to OOM killer */
+#define TIF_POLLING_NRFLAG	14	/* idle is polling for TIF_NEED_RESCHED */
+
+#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
+#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
+#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
+#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
+#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
+#define _TIF_NOTIFY_SIGNAL	(1<<TIF_NOTIFY_SIGNAL)
+#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
+
+/* Work to do on interrupt/exception return.  */
+#define _TIF_WORK_MASK		(_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
+				 _TIF_NOTIFY_RESUME | _TIF_NOTIFY_SIGNAL)
+
+/* Work to do on any return to userspace.  */
+#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK		\
+				 | _TIF_SYSCALL_TRACE)
+
+#define TS_UAC_NOPRINT		0x0001	/* ! Preserve the following three */
+#define TS_UAC_NOFIX		0x0002	/* ! flags as they match          */
+#define TS_UAC_SIGBUS		0x0004	/* ! userspace part of 'osf_sysinfo' */
+
+#define SET_UNALIGN_CTL(task,value)	({				\
+	__u32 status = task_thread_info(task)->status & ~UAC_BITMASK;	\
+	if (value & PR_UNALIGN_NOPRINT)					\
+		status |= TS_UAC_NOPRINT;				\
+	if (value & PR_UNALIGN_SIGBUS)					\
+		status |= TS_UAC_SIGBUS;				\
+	if (value & 4)	/* alpha-specific */				\
+		status |= TS_UAC_NOFIX;					\
+	task_thread_info(task)->status = status;			\
+	0; })
+
+#define GET_UNALIGN_CTL(task,value)	({				\
+	__u32 status = task_thread_info(task)->status & ~UAC_BITMASK;	\
+	__u32 res = 0;							\
+	if (status & TS_UAC_NOPRINT)					\
+		res |= PR_UNALIGN_NOPRINT;				\
+	if (status & TS_UAC_SIGBUS)					\
+		res |= PR_UNALIGN_SIGBUS;				\
+	if (status & TS_UAC_NOFIX)					\
+		res |= 4;						\
+	put_user(res, (int __user *)(value));				\
+	})
+
+#endif /* __KERNEL__ */
+#endif /* _ALPHA_THREAD_INFO_H */