[deliverable/linux.git] / arch / microblaze / include / asm / thread_info.h

/*
 * Copyright (C) 2006 Atmark Techno, Inc.
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License. See the file "COPYING" in the main directory of this archive
 * for more details.
 */

#ifndef _ASM_MICROBLAZE_THREAD_INFO_H
#define _ASM_MICROBLAZE_THREAD_INFO_H

#ifdef __KERNEL__

/* we have 8k stack */
#define THREAD_SHIFT		13
#define THREAD_SIZE		(1 << THREAD_SHIFT)
#define THREAD_SIZE_ORDER	1

#ifndef __ASSEMBLY__
# include <linux/types.h>
# 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 cpu_context {
	__u32	r1; /* stack pointer */
	__u32	r2;
	/* dedicated registers */
	__u32	r13;
	__u32	r14;
	__u32	r15;
	__u32	r16;
	__u32	r17;
	__u32	r18;
	/* non-volatile registers */
	__u32	r19;
	__u32	r20;
	__u32	r21;
	__u32	r22;
	__u32	r23;
	__u32	r24;
	__u32	r25;
	__u32	r26;
	__u32	r27;
	__u32	r28;
	__u32	r29;
	__u32	r30;
	/* r31 is used as current task pointer */
	/* special purpose registers */
	__u32	msr;
	__u32	ear;
	__u32	esr;
	__u32	fsr;
};

typedef struct {
	unsigned long seg;
} mm_segment_t;

struct thread_info {
	struct task_struct	*task; /* main task structure */
	struct exec_domain	*exec_domain; /* execution domain */
	unsigned long		flags; /* low level flags */
	unsigned long		status; /* thread-synchronous flags */
	__u32			cpu; /* current CPU */
	__s32			preempt_count; /* 0 => preemptable,< 0 => BUG*/
	mm_segment_t		addr_limit; /* thread address space */
	struct restart_block	restart_block;

	struct cpu_context	cpu_context;
};

/*
 * macros/functions for gaining access to the thread information structure
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.exec_domain	= &default_exec_domain,	\
	.flags		= 0,			\
	.cpu		= 0,			\
	.preempt_count	= INIT_PREEMPT_COUNT,	\
	.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 */
static inline struct thread_info *current_thread_info(void)
{
	register unsigned long sp asm("r1");

	return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
}

/* thread information allocation */
#endif /* __ASSEMBLY__ */

#define PREEMPT_ACTIVE		0x10000000

/*
 * 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
 */
#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 */
/* restore singlestep on return to user mode */
#define TIF_SINGLESTEP		4
#define TIF_MEMDIE		6	/* is terminating due to OOM killer */
#define TIF_SYSCALL_AUDIT	9       /* syscall auditing active */
#define TIF_SECCOMP		10      /* secure computing */

/* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_POLLING_NRFLAG	16

#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_SINGLESTEP		(1 << TIF_SINGLESTEP)
#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP		(1 << TIF_SECCOMP)

/* work to do in syscall trace */
#define _TIF_WORK_SYSCALL_MASK  (_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
				 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)

/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK		0x0000FFFE

/* work to do on any return to u-space */
#define _TIF_ALLWORK_MASK	0x0000FFFF

/*
 * Thread-synchronous status.
 *
 * This is different from the flags in that nobody else
 * ever touches our thread-synchronous status, so we don't
 * have to worry about atomic accesses.
 */
/* FPU was used by this task this quantum (SMP) */
#define TS_USEDFPU		0x0001
#define TS_RESTORE_SIGMASK	0x0002

#ifndef __ASSEMBLY__
#define HAVE_SET_RESTORE_SIGMASK 1
static inline void set_restore_sigmask(void)
{
	struct thread_info *ti = current_thread_info();
	ti->status |= TS_RESTORE_SIGMASK;
	WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
}
static inline void clear_restore_sigmask(void)
{
	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
}
static inline bool test_restore_sigmask(void)
{
	return current_thread_info()->status & TS_RESTORE_SIGMASK;
}
static inline bool test_and_clear_restore_sigmask(void)
{
	struct thread_info *ti = current_thread_info();
	if (!(ti->status & TS_RESTORE_SIGMASK))
		return false;
	ti->status &= ~TS_RESTORE_SIGMASK;
	return true;
}
#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
#endif

#endif /* __KERNEL__ */
#endif /* _ASM_MICROBLAZE_THREAD_INFO_H */
Commit	Line	Data
4684dade MS	1	/*
	2	* Copyright (C) 2006 Atmark Techno, Inc.
	3	*
	4	* This file is subject to the terms and conditions of the GNU General Public
	5	* License. See the file "COPYING" in the main directory of this archive
	6	* for more details.
	7	*/
	8
	9	#ifndef _ASM_MICROBLAZE_THREAD_INFO_H
	10	#define _ASM_MICROBLAZE_THREAD_INFO_H
	11
	12	#ifdef __KERNEL__
	13
	14	/* we have 8k stack */
	15	#define THREAD_SHIFT 13
	16	#define THREAD_SIZE (1 << THREAD_SHIFT)
	17	#define THREAD_SIZE_ORDER 1
	18
	19	#ifndef __ASSEMBLY__
	20	# include <linux/types.h>
	21	# include <asm/processor.h>
4684dade MS	22
	23	/*
	24	* low level task data that entry.S needs immediate access to
	25	* - this struct should fit entirely inside of one cache line
	26	* - this struct shares the supervisor stack pages
	27	* - if the contents of this structure are changed, the assembly constants
	28	* must also be changed
	29	*/
	30
	31	struct cpu_context {
	32	__u32 r1; /* stack pointer */
	33	__u32 r2;
	34	/* dedicated registers */
	35	__u32 r13;
	36	__u32 r14;
	37	__u32 r15;
	38	__u32 r16;
	39	__u32 r17;
	40	__u32 r18;
	41	/* non-volatile registers */
	42	__u32 r19;
	43	__u32 r20;
	44	__u32 r21;
	45	__u32 r22;
	46	__u32 r23;
	47	__u32 r24;
	48	__u32 r25;
	49	__u32 r26;
	50	__u32 r27;
	51	__u32 r28;
	52	__u32 r29;
	53	__u32 r30;
	54	/* r31 is used as current task pointer */
	55	/* special purpose registers */
	56	__u32 msr;
	57	__u32 ear;
	58	__u32 esr;
	59	__u32 fsr;
	60	};
	61
40db0834 MS	62	typedef struct {
	63	unsigned long seg;
	64	} mm_segment_t;
	65
4684dade MS	66	struct thread_info {
	67	struct task_struct task; / main task structure */
	68	struct exec_domain exec_domain; / execution domain */
	69	unsigned long flags; /* low level flags */
	70	unsigned long status; /* thread-synchronous flags */
	71	__u32 cpu; /* current CPU */
	72	__s32 preempt_count; /* 0 => preemptable,< 0 => BUG*/
	73	mm_segment_t addr_limit; /* thread address space */
	74	struct restart_block restart_block;
	75
	76	struct cpu_context cpu_context;
	77	};
	78
	79	/*
	80	* macros/functions for gaining access to the thread information structure
4684dade MS	81	*/
	82	#define INIT_THREAD_INFO(tsk) \
	83	{ \
	84	.task = &tsk, \
	85	.exec_domain = &default_exec_domain, \
	86	.flags = 0, \
	87	.cpu = 0, \
c99e6efe	88	.preempt_count = INIT_PREEMPT_COUNT, \
4684dade MS	89	.addr_limit = KERNEL_DS, \
	90	.restart_block = { \
	91	.fn = do_no_restart_syscall, \
	92	}, \
	93	}
	94
	95	#define init_thread_info (init_thread_union.thread_info)
	96	#define init_stack (init_thread_union.stack)
	97
	98	/* how to get the thread information struct from C */
	99	static inline struct thread_info *current_thread_info(void)
	100	{
	101	register unsigned long sp asm("r1");
	102
	103	return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
	104	}
	105
	106	/* thread information allocation */
	107	#endif /* __ASSEMBLY__ */
	108
	109	#define PREEMPT_ACTIVE 0x10000000
	110
	111	/*
	112	* thread information flags
	113	* - these are process state flags that various assembly files may
	114	* need to access
	115	* - pending work-to-be-done flags are in LSW
	116	* - other flags in MSW
	117	*/
	118	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
	119	#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
	120	#define TIF_SIGPENDING 2 /* signal pending */
	121	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
	122	/* restore singlestep on return to user mode */
	123	#define TIF_SINGLESTEP 4
0ddc9324	124	#define TIF_MEMDIE 6 /* is terminating due to OOM killer */
0945f98b EI	125	#define TIF_SYSCALL_AUDIT 9 /* syscall auditing active */
0945f98b EI	126	#define TIF_SECCOMP 10 /* secure computing */
4684dade	127
4684dade MS	128	/* true if poll_idle() is polling TIF_NEED_RESCHED */
	129	#define TIF_POLLING_NRFLAG 16
	130
95d3a8cd MS	131	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
	132	#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
	133	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
	134	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
	135	#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
95d3a8cd	136	#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
0945f98b EI	137	#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
0945f98b EI	138	#define _TIF_SECCOMP (1 << TIF_SECCOMP)
4684dade	139
0945f98b EI	140	/* work to do in syscall trace */
	141	#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE \| _TIF_SINGLESTEP \| \
	142	_TIF_SYSCALL_AUDIT \| _TIF_SECCOMP)
	143
4684dade MS	144	/* work to do on interrupt/exception return */
4684dade MS	145	#define _TIF_WORK_MASK 0x0000FFFE
0945f98b	146
4684dade MS	147	/* work to do on any return to u-space */
	148	#define _TIF_ALLWORK_MASK 0x0000FFFF
	149
	150	/*
	151	* Thread-synchronous status.
	152	*
	153	* This is different from the flags in that nobody else
	154	* ever touches our thread-synchronous status, so we don't
	155	* have to worry about atomic accesses.
	156	*/
	157	/* FPU was used by this task this quantum (SMP) */
	158	#define TS_USEDFPU 0x0001
a6029d1c MS	159	#define TS_RESTORE_SIGMASK 0x0002
	160
	161	#ifndef __ASSEMBLY__
	162	#define HAVE_SET_RESTORE_SIGMASK 1
	163	static inline void set_restore_sigmask(void)
	164	{
	165	struct thread_info *ti = current_thread_info();
	166	ti->status \|= TS_RESTORE_SIGMASK;
edd63a27	167	WARN_ON(!test_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags));
a6029d1c	168	}
4ebefe3e AV	169	static inline void clear_restore_sigmask(void)
	170	{
	171	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
	172	}
	173	static inline bool test_restore_sigmask(void)
	174	{
	175	return current_thread_info()->status & TS_RESTORE_SIGMASK;
	176	}
	177	static inline bool test_and_clear_restore_sigmask(void)
	178	{
	179	struct thread_info *ti = current_thread_info();
	180	if (!(ti->status & TS_RESTORE_SIGMASK))
	181	return false;
	182	ti->status &= ~TS_RESTORE_SIGMASK;
	183	return true;
	184	}
16a80163	185	#define tsk_is_polling(t) test_tsk_thread_flag(t, TIF_POLLING_NRFLAG)
a6029d1c	186	#endif
4684dade MS	187
	188	#endif /* __KERNEL__ */
	189	#endif /* _ASM_MICROBLAZE_THREAD_INFO_H */