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

/* thread_info.h: PowerPC low-level thread information
 * adapted from the i386 version by Paul Mackerras
 *
 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
 */

#ifndef _ASM_POWERPC_THREAD_INFO_H
#define _ASM_POWERPC_THREAD_INFO_H

#ifdef __KERNEL__

/* We have 8k stacks on ppc32 and 16k on ppc64 */

#ifdef CONFIG_PPC64
#define THREAD_SHIFT		14
#else
#define THREAD_SHIFT		13
#endif

#define THREAD_SIZE		(1 << THREAD_SHIFT)

#ifndef __ASSEMBLY__
#include <linux/config.h>
#include <linux/cache.h>
#include <asm/processor.h>
#include <asm/page.h>
#include <linux/stringify.h>

/*
 * low level task data.
 */
struct thread_info {
	struct task_struct *task;		/* main task structure */
	struct exec_domain *exec_domain;	/* execution domain */
	int		cpu;			/* cpu we're on */
	int		preempt_count;		/* 0 => preemptable,
						   <0 => BUG */
	struct restart_block restart_block;
	/* set by force_successful_syscall_return */
	unsigned char	syscall_noerror;
	/* low level flags - has atomic operations done on it */
	unsigned long	flags ____cacheline_aligned_in_smp;
};

/*
 * macros/functions for gaining access to the thread information structure
 *
 * preempt_count needs to be 1 initially, until the scheduler is functional.
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task =		&tsk,			\
	.exec_domain =	&default_exec_domain,	\
	.cpu =		0,			\
	.preempt_count = 1,			\
	.restart_block = {			\
		.fn = do_no_restart_syscall,	\
	},					\
	.flags =	0,			\
}

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

/* 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(ti)	kfree(ti)
#define get_thread_info(ti)	get_task_struct((ti)->task)
#define put_thread_info(ti)	put_task_struct((ti)->task)

/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
	register unsigned long sp asm("r1");

	/* gcc4, at least, is smart enough to turn this into a single
	 * rlwinm for ppc32 and clrrdi for ppc64 */
	return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
}

#endif /* __ASSEMBLY__ */

#define PREEMPT_ACTIVE		0x10000000

/*
 * thread information flag bit numbers
 */
#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	/* true if poll_idle() is polling
					   TIF_NEED_RESCHED */
#define TIF_32BIT		5	/* 32 bit binary */
/* #define SPARE		6 */
#define TIF_ABI_PENDING		7	/* 32/64 bit switch needed */
#define TIF_SYSCALL_AUDIT	8	/* syscall auditing active */
#define TIF_SINGLESTEP		9	/* singlestepping active */
#define TIF_MEMDIE		10
#define TIF_SECCOMP		11	/* secure computing */

/* as above, but as bit values */
#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)
#define _TIF_32BIT		(1<<TIF_32BIT)
/* #define _SPARE		(1<<SPARE) */
#define _TIF_ABI_PENDING	(1<<TIF_ABI_PENDING)
#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
#define _TIF_SYSCALL_T_OR_A	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)

#define _TIF_USER_WORK_MASK	(_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
				 _TIF_NEED_RESCHED)

#endif /* __KERNEL__ */

#endif /* _ASM_POWERPC_THREAD_INFO_H */
Commit	Line	Data
6cb7bfeb	1	/* thread_info.h: PowerPC low-level thread information
1da177e4 LT	2	* adapted from the i386 version by Paul Mackerras
	3	*
	4	* Copyright (C) 2002 David Howells (dhowells@redhat.com)
	5	* - Incorporating suggestions made by Linus Torvalds and Dave Miller
	6	*/
	7
6cb7bfeb DG	8	#ifndef _ASM_POWERPC_THREAD_INFO_H
6cb7bfeb DG	9	#define _ASM_POWERPC_THREAD_INFO_H
1da177e4 LT	10
	11	#ifdef __KERNEL__
	12
6cb7bfeb DG	13	/* We have 8k stacks on ppc32 and 16k on ppc64 */
	14
	15	#ifdef CONFIG_PPC64
	16	#define THREAD_SHIFT 14
	17	#else
	18	#define THREAD_SHIFT 13
	19	#endif
	20
	21	#define THREAD_SIZE (1 << THREAD_SHIFT)
	22
1da177e4 LT	23	#ifndef __ASSEMBLY__
	24	#include <linux/config.h>
	25	#include <linux/cache.h>
	26	#include <asm/processor.h>
	27	#include <asm/page.h>
	28	#include <linux/stringify.h>
	29
	30	/*
	31	* low level task data.
	32	*/
	33	struct thread_info {
	34	struct task_struct task; / main task structure */
	35	struct exec_domain exec_domain; / execution domain */
	36	int cpu; /* cpu we're on */
6cb7bfeb DG	37	int preempt_count; /* 0 => preemptable,
6cb7bfeb DG	38	<0 => BUG */
1da177e4 LT	39	struct restart_block restart_block;
	40	/* set by force_successful_syscall_return */
	41	unsigned char syscall_noerror;
	42	/* low level flags - has atomic operations done on it */
	43	unsigned long flags ____cacheline_aligned_in_smp;
	44	};
	45
	46	/*
	47	* macros/functions for gaining access to the thread information structure
	48	*
	49	* preempt_count needs to be 1 initially, until the scheduler is functional.
	50	*/
	51	#define INIT_THREAD_INFO(tsk) \
	52	{ \
	53	.task = &tsk, \
	54	.exec_domain = &default_exec_domain, \
	55	.cpu = 0, \
	56	.preempt_count = 1, \
	57	.restart_block = { \
	58	.fn = do_no_restart_syscall, \
	59	}, \
	60	.flags = 0, \
	61	}
	62
	63	#define init_thread_info (init_thread_union.thread_info)
	64	#define init_stack (init_thread_union.stack)
	65
	66	/* thread information allocation */
	67
1da177e4 LT	68	#ifdef CONFIG_DEBUG_STACK_USAGE
	69	#define alloc_thread_info(tsk) \
	70	({ \
	71	struct thread_info *ret; \
	72	\
	73	ret = kmalloc(THREAD_SIZE, GFP_KERNEL); \
	74	if (ret) \
	75	memset(ret, 0, THREAD_SIZE); \
	76	ret; \
	77	})
	78	#else
6cb7bfeb	79	#define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
1da177e4 LT	80	#endif
	81	#define free_thread_info(ti) kfree(ti)
	82	#define get_thread_info(ti) get_task_struct((ti)->task)
	83	#define put_thread_info(ti) put_task_struct((ti)->task)
	84
	85	/* how to get the thread information struct from C */
	86	static inline struct thread_info *current_thread_info(void)
	87	{
6cb7bfeb DG	88	register unsigned long sp asm("r1");
	89
	90	/* gcc4, at least, is smart enough to turn this into a single
	91	* rlwinm for ppc32 and clrrdi for ppc64 */
	92	return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
1da177e4 LT	93	}
	94
	95	#endif /* __ASSEMBLY__ */
	96
	97	#define PREEMPT_ACTIVE 0x10000000
	98
	99	/*
	100	* thread information flag bit numbers
	101	*/
	102	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
	103	#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
	104	#define TIF_SIGPENDING 2 /* signal pending */
	105	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
	106	#define TIF_POLLING_NRFLAG 4 /* true if poll_idle() is polling
	107	TIF_NEED_RESCHED */
	108	#define TIF_32BIT 5 /* 32 bit binary */
6dc2f0c7	109	/* #define SPARE 6 */
1da177e4 LT	110	#define TIF_ABI_PENDING 7 /* 32/64 bit switch needed */
	111	#define TIF_SYSCALL_AUDIT 8 /* syscall auditing active */
	112	#define TIF_SINGLESTEP 9 /* singlestepping active */
	113	#define TIF_MEMDIE 10
	114	#define TIF_SECCOMP 11 /* secure computing */
	115
	116	/* as above, but as bit values */
	117	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
	118	#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
	119	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	120	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	121	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
	122	#define _TIF_32BIT (1<<TIF_32BIT)
6dc2f0c7	123	/* #define _SPARE (1<<SPARE) */
1da177e4 LT	124	#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
	125	#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
	126	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
	127	#define _TIF_SECCOMP (1<<TIF_SECCOMP)
	128	#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE\|_TIF_SYSCALL_AUDIT\|_TIF_SECCOMP)
	129
	130	#define _TIF_USER_WORK_MASK (_TIF_NOTIFY_RESUME \| _TIF_SIGPENDING \| \
	131	_TIF_NEED_RESCHED)
	132
	133	#endif /* __KERNEL__ */
	134
6cb7bfeb	135	#endif /* _ASM_POWERPC_THREAD_INFO_H */