[linux-2.6-block.git] / include / asm-arm / thread_info.h

/*
 *  linux/include/asm-arm/thread_info.h
 *
 *  Copyright (C) 2002 Russell King.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_ARM_THREAD_INFO_H
#define __ASM_ARM_THREAD_INFO_H

#ifdef __KERNEL__

#include <linux/compiler.h>
#include <asm/fpstate.h>

#define THREAD_SIZE_ORDER	1
#define THREAD_SIZE		8192
#define THREAD_START_SP		(THREAD_SIZE - 8)

#ifndef __ASSEMBLY__

struct task_struct;
struct exec_domain;

#include <asm/ptrace.h>
#include <asm/types.h>
#include <asm/domain.h>

typedef unsigned long mm_segment_t;

struct cpu_context_save {
	__u32	r4;
	__u32	r5;
	__u32	r6;
	__u32	r7;
	__u32	r8;
	__u32	r9;
	__u32	sl;
	__u32	fp;
	__u32	sp;
	__u32	pc;
	__u32	extra[2];		/* Xscale 'acc' register, etc */
};

/*
 * low level task data that entry.S needs immediate access to.
 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
 */
struct thread_info {
	unsigned long		flags;		/* low level flags */
	int			preempt_count;	/* 0 => preemptable, <0 => bug */
	mm_segment_t		addr_limit;	/* address limit */
	struct task_struct	*task;		/* main task structure */
	struct exec_domain	*exec_domain;	/* execution domain */
	__u32			cpu;		/* cpu */
	__u32			cpu_domain;	/* cpu domain */
	struct cpu_context_save	cpu_context;	/* cpu context */
	__u8			used_cp[16];	/* thread used copro */
	unsigned long		tp_value;
	union fp_state		fpstate __attribute__((aligned(8)));
	union vfp_state		vfpstate;
	struct restart_block	restart_block;
};

#define INIT_THREAD_INFO(tsk)						\
{									\
	.task		= &tsk,						\
	.exec_domain	= &default_exec_domain,				\
	.flags		= 0,						\
	.preempt_count	= 1,						\
	.addr_limit	= KERNEL_DS,					\
	.cpu_domain	= domain_val(DOMAIN_USER, DOMAIN_MANAGER) |	\
			  domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) |	\
			  domain_val(DOMAIN_IO, DOMAIN_CLIENT),		\
	.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) __attribute_const__;

static inline struct thread_info *current_thread_info(void)
{
	register unsigned long sp asm ("sp");
	return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
}

extern struct thread_info *alloc_thread_info(struct task_struct *task);
extern void free_thread_info(struct thread_info *);

#define thread_saved_pc(tsk)	\
	((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc)))
#define thread_saved_fp(tsk)	\
	((unsigned long)(task_thread_info(tsk)->cpu_context.fp))

extern void iwmmxt_task_disable(struct thread_info *);
extern void iwmmxt_task_copy(struct thread_info *, void *);
extern void iwmmxt_task_restore(struct thread_info *, void *);
extern void iwmmxt_task_release(struct thread_info *);

#endif

/*
 * We use bit 30 of the preempt_count to indicate that kernel
 * preemption is occuring.  See include/asm-arm/hardirq.h.
 */
#define PREEMPT_ACTIVE	0x40000000

/*
 * thread information flags:
 *  TIF_SYSCALL_TRACE	- syscall trace active
 *  TIF_NOTIFY_RESUME	- resumption notification requested
 *  TIF_SIGPENDING	- signal pending
 *  TIF_NEED_RESCHED	- rescheduling necessary
 *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
 *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
 */
#define TIF_NOTIFY_RESUME	0
#define TIF_SIGPENDING		1
#define TIF_NEED_RESCHED	2
#define TIF_SYSCALL_TRACE	8
#define TIF_POLLING_NRFLAG	16
#define TIF_USING_IWMMXT	17
#define TIF_MEMDIE		18

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

/*
 * Change these and you break ASM code in entry-common.S
 */
#define _TIF_WORK_MASK		0x000000ff

#endif /* __KERNEL__ */
#endif /* __ASM_ARM_THREAD_INFO_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/include/asm-arm/thread_info.h
	3	*
	4	* Copyright (C) 2002 Russell King.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10	#ifndef __ASM_ARM_THREAD_INFO_H
	11	#define __ASM_ARM_THREAD_INFO_H
	12
	13	#ifdef __KERNEL__
	14
8dc39b88	15	#include <linux/compiler.h>
1da177e4 LT	16	#include <asm/fpstate.h>
1da177e4 LT	17
4f7a1812 RK	18	#define THREAD_SIZE_ORDER 1
	19	#define THREAD_SIZE 8192
	20	#define THREAD_START_SP (THREAD_SIZE - 8)
	21
1da177e4 LT	22	#ifndef __ASSEMBLY__
	23
	24	struct task_struct;
	25	struct exec_domain;
	26
	27	#include <asm/ptrace.h>
	28	#include <asm/types.h>
	29	#include <asm/domain.h>
	30
	31	typedef unsigned long mm_segment_t;
	32
	33	struct cpu_context_save {
	34	__u32 r4;
	35	__u32 r5;
	36	__u32 r6;
	37	__u32 r7;
	38	__u32 r8;
	39	__u32 r9;
	40	__u32 sl;
	41	__u32 fp;
	42	__u32 sp;
	43	__u32 pc;
	44	__u32 extra[2]; /* Xscale 'acc' register, etc */
	45	};
	46
	47	/*
	48	* low level task data that entry.S needs immediate access to.
	49	* __switch_to() assumes cpu_context follows immediately after cpu_domain.
	50	*/
	51	struct thread_info {
	52	unsigned long flags; /* low level flags */
dcd497f9	53	int preempt_count; /* 0 => preemptable, <0 => bug */
1da177e4 LT	54	mm_segment_t addr_limit; /* address limit */
	55	struct task_struct task; / main task structure */
	56	struct exec_domain exec_domain; / execution domain */
	57	__u32 cpu; /* cpu */
	58	__u32 cpu_domain; /* cpu domain */
	59	struct cpu_context_save cpu_context; /* cpu context */
	60	__u8 used_cp[16]; /* thread used copro */
	61	unsigned long tp_value;
cdaabbd7	62	union fp_state fpstate __attribute__((aligned(8)));
1da177e4 LT	63	union vfp_state vfpstate;
	64	struct restart_block restart_block;
	65	};
	66
	67	#define INIT_THREAD_INFO(tsk) \
	68	{ \
	69	.task = &tsk, \
	70	.exec_domain = &default_exec_domain, \
	71	.flags = 0, \
	72	.preempt_count = 1, \
	73	.addr_limit = KERNEL_DS, \
	74	.cpu_domain = domain_val(DOMAIN_USER, DOMAIN_MANAGER) \| \
	75	domain_val(DOMAIN_KERNEL, DOMAIN_MANAGER) \| \
	76	domain_val(DOMAIN_IO, DOMAIN_CLIENT), \
	77	.restart_block = { \
	78	.fn = do_no_restart_syscall, \
	79	}, \
	80	}
	81
	82	#define init_thread_info (init_thread_union.thread_info)
	83	#define init_stack (init_thread_union.stack)
	84
1da177e4 LT	85	/*
	86	* how to get the thread information struct from C
	87	*/
	88	static inline struct thread_info *current_thread_info(void) __attribute_const__;
	89
	90	static inline struct thread_info *current_thread_info(void)
	91	{
	92	register unsigned long sp asm ("sp");
	93	return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
	94	}
	95
	96	extern struct thread_info alloc_thread_info(struct task_struct task);
	97	extern void free_thread_info(struct thread_info *);
	98
1da177e4	99	#define thread_saved_pc(tsk) \
e7c1b32f	100	((unsigned long)(pc_pointer(task_thread_info(tsk)->cpu_context.pc)))
1da177e4	101	#define thread_saved_fp(tsk) \
e7c1b32f	102	((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
1da177e4 LT	103
	104	extern void iwmmxt_task_disable(struct thread_info *);
	105	extern void iwmmxt_task_copy(struct thread_info , void );
	106	extern void iwmmxt_task_restore(struct thread_info , void );
	107	extern void iwmmxt_task_release(struct thread_info *);
	108
	109	#endif
	110
	111	/*
	112	* We use bit 30 of the preempt_count to indicate that kernel
	113	* preemption is occuring. See include/asm-arm/hardirq.h.
	114	*/
	115	#define PREEMPT_ACTIVE 0x40000000
	116
	117	/*
	118	* thread information flags:
	119	* TIF_SYSCALL_TRACE - syscall trace active
	120	* TIF_NOTIFY_RESUME - resumption notification requested
	121	* TIF_SIGPENDING - signal pending
	122	* TIF_NEED_RESCHED - rescheduling necessary
	123	* TIF_USEDFPU - FPU was used by this task this quantum (SMP)
	124	* TIF_POLLING_NRFLAG - true if poll_idle() is polling TIF_NEED_RESCHED
	125	*/
	126	#define TIF_NOTIFY_RESUME 0
	127	#define TIF_SIGPENDING 1
	128	#define TIF_NEED_RESCHED 2
	129	#define TIF_SYSCALL_TRACE 8
	130	#define TIF_POLLING_NRFLAG 16
	131	#define TIF_USING_IWMMXT 17
	132	#define TIF_MEMDIE 18
	133
	134	#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
	135	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
	136	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
	137	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
	138	#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
	139	#define _TIF_USING_IWMMXT (1 << TIF_USING_IWMMXT)
	140
	141	/*
	142	* Change these and you break ASM code in entry-common.S
	143	*/
	144	#define _TIF_WORK_MASK 0x000000ff
	145
	146	#endif /* __KERNEL__ */
	147	#endif /* __ASM_ARM_THREAD_INFO_H */