[deliverable/linux.git] / 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)

#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_SIGPENDING		1	/* signal pending */
#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
#define TIF_POLLING_NRFLAG	3	/* poll_idle is polling NEED_RESCHED */
#define TIF_DIE_IF_KERNEL	4	/* dik recursion lock */
#define TIF_UAC_NOPRINT		5	/* see sysinfo.h */
#define TIF_UAC_NOFIX		6
#define TIF_UAC_SIGBUS		7
#define TIF_MEMDIE		8
#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal */

#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)

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

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

#define ALPHA_UAC_SHIFT		6
#define ALPHA_UAC_MASK		(1 << TIF_UAC_NOPRINT | 1 << TIF_UAC_NOFIX | \
				 1 << TIF_UAC_SIGBUS)

#define SET_UNALIGN_CTL(task,value)	({				     \
	task_thread_info(task)->flags = ((task_thread_info(task)->flags &    \
		~ALPHA_UAC_MASK)					     \
		| (((value) << ALPHA_UAC_SHIFT)       & (1<<TIF_UAC_NOPRINT))\
		| (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
		| (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
	0; })

#define GET_UNALIGN_CTL(task,value)	({				\
	put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\
		  >> ALPHA_UAC_SHIFT					\
		 | (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\
		 >> (ALPHA_UAC_SHIFT + 1)				\
		 | (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\
		 >> (ALPHA_UAC_SHIFT - 1),				\
		 (int __user *)(value));				\
	})

#endif /* __KERNEL__ */
#endif /* _ALPHA_THREAD_INFO_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _ALPHA_THREAD_INFO_H
	2	#define _ALPHA_THREAD_INFO_H
	3
	4	#ifdef __KERNEL__
	5
	6	#ifndef __ASSEMBLY__
	7	#include <asm/processor.h>
	8	#include <asm/types.h>
	9	#include <asm/hwrpb.h>
	10	#endif
	11
	12	#ifndef __ASSEMBLY__
	13	struct thread_info {
	14	struct pcb_struct pcb; /* palcode state */
	15
	16	struct task_struct task; / main task structure */
	17	unsigned int flags; /* low level flags */
	18	unsigned int ieee_state; /* see fpu.h */
	19
	20	struct exec_domain exec_domain; / execution domain */
	21	mm_segment_t addr_limit; /* thread address space */
	22	unsigned cpu; /* current CPU */
	23	int preempt_count; /* 0 => preemptable, <0 => BUG */
	24
	25	int bpt_nsaved;
	26	unsigned long bpt_addr[2]; /* breakpoint handling */
	27	unsigned int bpt_insn[2];
	28
	29	struct restart_block restart_block;
	30	};
	31
	32	/*
	33	* Macros/functions for gaining access to the thread information structure.
	34	*/
	35	#define INIT_THREAD_INFO(tsk) \
	36	{ \
	37	.task = &tsk, \
	38	.exec_domain = &default_exec_domain, \
	39	.addr_limit = KERNEL_DS, \
	40	.restart_block = { \
	41	.fn = do_no_restart_syscall, \
	42	}, \
	43	}
	44
	45	#define init_thread_info (init_thread_union.thread_info)
	46	#define init_stack (init_thread_union.stack)
	47
	48	/* How to get the thread information struct from C. */
	49	register struct thread_info *__current_thread_info __asm__("$8");
	50	#define current_thread_info() __current_thread_info
	51
	52	/* Thread information allocation. */
	53	#define THREAD_SIZE (2*PAGE_SIZE)
	54	#define alloc_thread_info(tsk) \
	55	((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
	56	#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
1da177e4 LT	57
	58	#endif /* __ASSEMBLY__ */
	59
	60	#define PREEMPT_ACTIVE 0x40000000
	61
	62	/*
	63	* Thread information flags:
	64	* - these are process state flags and used from assembly
	65	* - pending work-to-be-done flags come first to fit in and immediate operand.
	66	*
	67	* TIF_SYSCALL_TRACE is known to be 0 via blbs.
	68	*/
	69	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	70	#define TIF_SIGPENDING 1 /* signal pending */
	71	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	72	#define TIF_POLLING_NRFLAG 3 /* poll_idle is polling NEED_RESCHED */
	73	#define TIF_DIE_IF_KERNEL 4 /* dik recursion lock */
	74	#define TIF_UAC_NOPRINT 5 /* see sysinfo.h */
	75	#define TIF_UAC_NOFIX 6
	76	#define TIF_UAC_SIGBUS 7
	77	#define TIF_MEMDIE 8
	78	#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */
1da177e4 LT	79
1da177e4 LT	80	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
1da177e4 LT	81	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	82	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	83	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
b927b3e2	84	#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
1da177e4 LT	85
1da177e4 LT	86	/* Work to do on interrupt/exception return. */
a583f1b5	87	#define _TIF_WORK_MASK (_TIF_SIGPENDING \| _TIF_NEED_RESCHED)
1da177e4 LT	88
	89	/* Work to do on any return to userspace. */
	90	#define _TIF_ALLWORK_MASK (_TIF_WORK_MASK \
	91	\| _TIF_SYSCALL_TRACE)
	92
ed58a593 IK	93	#define ALPHA_UAC_SHIFT 6
	94	#define ALPHA_UAC_MASK (1 << TIF_UAC_NOPRINT \| 1 << TIF_UAC_NOFIX \| \
	95	1 << TIF_UAC_SIGBUS)
	96
	97	#define SET_UNALIGN_CTL(task,value) ({ \
f7e4217b	98	task_thread_info(task)->flags = ((task_thread_info(task)->flags & \
ed58a593 IK	99	~ALPHA_UAC_MASK) \
	100	\| (((value) << ALPHA_UAC_SHIFT) & (1<<TIF_UAC_NOPRINT))\
	101	\| (((value) << (ALPHA_UAC_SHIFT + 1)) & (1<<TIF_UAC_SIGBUS)) \
	102	\| (((value) << (ALPHA_UAC_SHIFT - 1)) & (1<<TIF_UAC_NOFIX)));\
	103	0; })
	104
	105	#define GET_UNALIGN_CTL(task,value) ({ \
f7e4217b	106	put_user((task_thread_info(task)->flags & (1 << TIF_UAC_NOPRINT))\
ed58a593	107	>> ALPHA_UAC_SHIFT \
f7e4217b	108	\| (task_thread_info(task)->flags & (1 << TIF_UAC_SIGBUS))\
ed58a593	109	>> (ALPHA_UAC_SHIFT + 1) \
f7e4217b	110	\| (task_thread_info(task)->flags & (1 << TIF_UAC_NOFIX))\
ed58a593 IK	111	>> (ALPHA_UAC_SHIFT - 1), \
	112	(int __user *)(value)); \
	113	})
	114
1da177e4 LT	115	#endif /* __KERNEL__ */
1da177e4 LT	116	#endif /* _ALPHA_THREAD_INFO_H */