include/asm-alpha/thread_info.h

#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>
#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 */

	struct exec_domain	*exec_domain;	/* execution domain */
	mm_segment_t		addr_limit;	/* thread address space */
	unsigned		cpu;		/* current CPU */
	int			preempt_count; /* 0 => preemptable, <0 => BUG */

	int bpt_nsaved;
	unsigned long bpt_addr[2];		/* breakpoint handling  */
	unsigned int bpt_insn[2];

	struct restart_block	restart_block;
};

/*
 * Macros/functions for gaining access to the thread information structure.
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.exec_domain	= &default_exec_domain,	\
	.addr_limit	= KERNEL_DS,		\
	.restart_block = {			\
		.fn = do_no_restart_syscall,	\
	},					\
}

#define init_thread_info	(init_thread_union.thread_info)
#define init_stack		(init_thread_union.stack)

/* 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

/* Thread information allocation.  */
#define THREAD_SIZE (2*PAGE_SIZE)
#define alloc_thread_info(tsk) \
  ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
#define get_thread_info(ti) get_task_struct((ti)->task)
#define put_thread_info(ti) put_task_struct((ti)->task)

#endif /* __ASSEMBLY__ */

#define PREEMPT_ACTIVE		0x40000000

/*
 * Thread information flags:
 * - these are process state flags and used from assembly
 * - pending work-to-be-done flags come first 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	/* resumption notification requested */
#define TIF_SIGPENDING		2	/* signal pending */
#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
#define TIF_POLLING_NRFLAG	4	/* poll_idle is polling NEED_RESCHED */
#define TIF_DIE_IF_KERNEL	5	/* dik recursion lock */
#define TIF_UAC_NOPRINT		6	/* see sysinfo.h */
#define TIF_UAC_NOFIX		7
#define TIF_UAC_SIGBUS		8
#define TIF_MEMDIE		9

#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)

/* Work to do on interrupt/exception return.  */
#define _TIF_WORK_MASK		(_TIF_NOTIFY_RESUME	\
				 | _TIF_SIGPENDING	\
				 | _TIF_NEED_RESCHED)

/* Work to do on any return to userspace.  */
#define _TIF_ALLWORK_MASK	(_TIF_WORK_MASK		\
				 | _TIF_SYSCALL_TRACE)

#endif /* __KERNEL__ */
#endif /* _ALPHA_THREAD_INFO_H */