[mirror_ubuntu-artful-kernel.git] / include / asm-frv / thread_info.h

/* thread_info.h: description
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 * Derived from include/asm-i386/thread_info.h
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#ifdef __KERNEL__

#ifndef __ASSEMBLY__
#include <asm/processor.h>
#endif

/*
 * 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
 */
#ifndef __ASSEMBLY__

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:
					 	   0-0xBFFFFFFF for user-thead
						   0-0xFFFFFFFF for kernel-thread
						*/
	struct restart_block    restart_block;

	__u8			supervisor_stack[0];
};

#else /* !__ASSEMBLY__ */

/* offsets into the thread_info struct for assembly code access */
#define TI_TASK			0x00000000
#define TI_EXEC_DOMAIN		0x00000004
#define TI_FLAGS		0x00000008
#define TI_STATUS		0x0000000C
#define TI_CPU			0x00000010
#define TI_PRE_COUNT		0x00000014
#define TI_ADDR_LIMIT		0x00000018
#define TI_RESTART_BLOCK	0x0000001C

#endif

#define PREEMPT_ACTIVE		0x4000000

/*
 * macros/functions for gaining access to the thread information structure
 *
 * preempt_count needs to be 1 initially, until the scheduler is functional.
 */
#ifndef __ASSEMBLY__

#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.exec_domain	= &default_exec_domain,	\
	.flags		= 0,			\
	.cpu		= 0,			\
	.preempt_count	= 1,			\
	.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)

#ifdef CONFIG_SMALL_TASKS
#define THREAD_SIZE		4096
#else
#define THREAD_SIZE		8192
#endif

/* how to get the thread information struct from C */
register struct thread_info *__current_thread_info asm("gr15");

#define current_thread_info() ({ __current_thread_info; })

/* thread information allocation */
#ifdef CONFIG_DEBUG_STACK_USAGE
#define alloc_thread_info(tsk)					\
	({							\
		struct thread_info *ret;			\
								\
		ret = kmalloc(THREAD_SIZE, GFP_KERNEL);		\
		if (ret)					\
			memset(ret, 0, THREAD_SIZE);		\
		ret;						\
	})
#else
#define alloc_thread_info(tsk)	kmalloc(THREAD_SIZE, GFP_KERNEL)
#endif

#define free_thread_info(info)	kfree(info)
#define get_thread_info(ti)	get_task_struct((ti)->task)
#define put_thread_info(ti)	put_task_struct((ti)->task)

#else /* !__ASSEMBLY__ */

#define THREAD_SIZE	8192

#endif

/*
 * 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 */
#define TIF_SINGLESTEP		4	/* restore singlestep on return to user mode */
#define TIF_IRET		5	/* return with iret */
#define TIF_POLLING_NRFLAG	16	/* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE		17	/* OOM killer killed process */

#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_IRET		(1 << TIF_IRET)
#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)

#define _TIF_WORK_MASK		0x0000FFFE	/* work to do on interrupt/exception return */
#define _TIF_ALLWORK_MASK	0x0000FFFF	/* work to do on any return to u-space */

/*
 * 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.
 */
#define TS_USEDFPM		0x0001	/* FPU/Media was used by this task this quantum (SMP) */

#endif /* __KERNEL__ */

#endif /* _ASM_THREAD_INFO_H */
Commit	Line	Data
1da177e4 LT	1	/* thread_info.h: description
	2	*
	3	* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
	4	* Written by David Howells (dhowells@redhat.com)
	5	* Derived from include/asm-i386/thread_info.h
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*/
	12
	13	#ifndef _ASM_THREAD_INFO_H
	14	#define _ASM_THREAD_INFO_H
	15
	16	#ifdef __KERNEL__
	17
	18	#ifndef __ASSEMBLY__
	19	#include <asm/processor.h>
	20	#endif
	21
	22	/*
	23	* low level task data that entry.S needs immediate access to
	24	* - this struct should fit entirely inside of one cache line
	25	* - this struct shares the supervisor stack pages
	26	* - if the contents of this structure are changed, the assembly constants must also be changed
	27	*/
	28	#ifndef __ASSEMBLY__
	29
	30	struct thread_info {
	31	struct task_struct task; / main task structure */
	32	struct exec_domain exec_domain; / execution domain */
	33	unsigned long flags; /* low level flags */
	34	unsigned long status; /* thread-synchronous flags */
	35	__u32 cpu; /* current CPU */
	36	__s32 preempt_count; /* 0 => preemptable, <0 => BUG */
	37
	38	mm_segment_t addr_limit; /* thread address space:
	39	0-0xBFFFFFFF for user-thead
	40	0-0xFFFFFFFF for kernel-thread
	41	*/
	42	struct restart_block restart_block;
	43
	44	__u8 supervisor_stack[0];
	45	};
	46
	47	#else /* !__ASSEMBLY__ */
	48
	49	/* offsets into the thread_info struct for assembly code access */
	50	#define TI_TASK 0x00000000
	51	#define TI_EXEC_DOMAIN 0x00000004
	52	#define TI_FLAGS 0x00000008
	53	#define TI_STATUS 0x0000000C
	54	#define TI_CPU 0x00000010
	55	#define TI_PRE_COUNT 0x00000014
	56	#define TI_ADDR_LIMIT 0x00000018
	57	#define TI_RESTART_BLOCK 0x0000001C
	58
	59	#endif
	60
	61	#define PREEMPT_ACTIVE 0x4000000
	62
	63	/*
	64	* macros/functions for gaining access to the thread information structure
65	*
66	* preempt_count needs to be 1 initially, until the scheduler is functional.
67	*/
68	#ifndef __ASSEMBLY__
69
70	#define INIT_THREAD_INFO(tsk) \
71	{ \
72	.task = &tsk, \
73	.exec_domain = &default_exec_domain, \
74	.flags = 0, \
75	.cpu = 0, \
76	.preempt_count = 1, \
77	.addr_limit = KERNEL_DS, \
78	.restart_block = { \
79	.fn = do_no_restart_syscall, \
80	}, \
81	}
82
83	#define init_thread_info (init_thread_union.thread_info)
84	#define init_stack (init_thread_union.stack)
85
86	#ifdef CONFIG_SMALL_TASKS
87	#define THREAD_SIZE 4096
88	#else
89	#define THREAD_SIZE 8192
90	#endif
91
92	/* how to get the thread information struct from C */
93	register struct thread_info *__current_thread_info asm("gr15");
94
95	#define current_thread_info() ({ __current_thread_info; })
96
97	/* thread information allocation */
98	#ifdef CONFIG_DEBUG_STACK_USAGE
99	#define alloc_thread_info(tsk) \
100	({ \
101	struct thread_info *ret; \
102	\
103	ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
104	if (ret) \
105	memset(ret, 0, THREAD_SIZE); \
106	ret; \
107	})
108	#else
109	#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
110	#endif
111
112	#define free_thread_info(info) kfree(info)
113	#define get_thread_info(ti) get_task_struct((ti)->task)
114	#define put_thread_info(ti) put_task_struct((ti)->task)
115
116	#else /* !__ASSEMBLY__ */
117
118	#define THREAD_SIZE 8192
119
120	#endif
121
122	/*
123	* thread information flags
124	* - these are process state flags that various assembly files may need to access
125	* - pending work-to-be-done flags are in LSW
126	* - other flags in MSW
127	*/
128	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
129	#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
130	#define TIF_SIGPENDING 2 /* signal pending */
131	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
132	#define TIF_SINGLESTEP 4 /* restore singlestep on return to user mode */
133	#define TIF_IRET 5 /* return with iret */
134	#define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
135	#define TIF_MEMDIE 17 /* OOM killer killed process */
136
137	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
138	#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
139	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
140	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
141	#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
142	#define _TIF_IRET (1 << TIF_IRET)
143	#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
144
145	#define _TIF_WORK_MASK 0x0000FFFE /* work to do on interrupt/exception return */
146	#define _TIF_ALLWORK_MASK 0x0000FFFF /* work to do on any return to u-space */
147
148	/*
149	* Thread-synchronous status.
150	*
151	* This is different from the flags in that nobody else
152	* ever touches our thread-synchronous status, so we don't
153	* have to worry about atomic accesses.
154	*/
155	#define TS_USEDFPM 0x0001 /* FPU/Media was used by this task this quantum (SMP) */
156
157	#endif /* __KERNEL__ */
158
159	#endif /* _ASM_THREAD_INFO_H */