[deliverable/linux.git] / arch / powerpc / include / asm / 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/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;
	unsigned long	local_flags;		/* private flags for thread */

	/* 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 */

#if THREAD_SHIFT >= PAGE_SHIFT

#define THREAD_SIZE_ORDER	(THREAD_SHIFT - PAGE_SHIFT)

#else /* THREAD_SHIFT < PAGE_SHIFT */

#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR

extern struct thread_info *alloc_thread_info(struct task_struct *tsk);
extern void free_thread_info(struct thread_info *ti);

#endif /* THREAD_SHIFT < PAGE_SHIFT */

/* 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_SIGPENDING		1	/* signal pending */
#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
#define TIF_POLLING_NRFLAG	3	/* true if poll_idle() is polling
					   TIF_NEED_RESCHED */
#define TIF_32BIT		4	/* 32 bit binary */
#define TIF_PERFMON_WORK	5	/* work for pfm_handle_work() */
#define TIF_PERFMON_CTXSW	6	/* perfmon needs ctxsw calls */
#define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */
#define TIF_SINGLESTEP		8	/* singlestepping active */
#define TIF_MEMDIE		9
#define TIF_SECCOMP		10	/* secure computing */
#define TIF_RESTOREALL		11	/* Restore all regs (implies NOERROR) */
#define TIF_NOERROR		12	/* Force successful syscall return */
#define TIF_NOTIFY_RESUME	13	/* callback before returning to user */
#define TIF_FREEZE		14	/* Freezing for suspend */
#define TIF_RUNLATCH		15	/* Is the runlatch enabled? */
#define TIF_ABI_PENDING		16	/* 32/64 bit switch needed */

/* as above, but as bit values */
#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_32BIT		(1<<TIF_32BIT)
#define _TIF_PERFMON_WORK	(1<<TIF_PERFMON_WORK)
#define _TIF_PERFMON_CTXSW	(1<<TIF_PERFMON_CTXSW)
#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
#define _TIF_RESTOREALL		(1<<TIF_RESTOREALL)
#define _TIF_NOERROR		(1<<TIF_NOERROR)
#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
#define _TIF_FREEZE		(1<<TIF_FREEZE)
#define _TIF_RUNLATCH		(1<<TIF_RUNLATCH)
#define _TIF_ABI_PENDING	(1<<TIF_ABI_PENDING)
#define _TIF_SYSCALL_T_OR_A	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)

#define _TIF_USER_WORK_MASK	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
				 _TIF_NOTIFY_RESUME)
#define _TIF_PERSYSCALL_MASK	(_TIF_RESTOREALL|_TIF_NOERROR)

/* Bits in local_flags */
/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
#define TLF_NAPPING		0	/* idle thread enabled NAP mode */
#define TLF_SLEEPING		1	/* suspend code enabled SLEEP mode */
#define TLF_RESTORE_SIGMASK	2	/* Restore signal mask in do_signal */

#define _TLF_NAPPING		(1 << TLF_NAPPING)
#define _TLF_SLEEPING		(1 << TLF_SLEEPING)
#define _TLF_RESTORE_SIGMASK	(1 << TLF_RESTORE_SIGMASK)

#ifndef __ASSEMBLY__
#define HAVE_SET_RESTORE_SIGMASK	1
static inline void set_restore_sigmask(void)
{
	struct thread_info *ti = current_thread_info();
	ti->local_flags |= _TLF_RESTORE_SIGMASK;
	set_bit(TIF_SIGPENDING, &ti->flags);
}
#endif	/* !__ASSEMBLY__ */

#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	23	#ifndef __ASSEMBLY__
1da177e4 LT	24	#include <linux/cache.h>
	25	#include <asm/processor.h>
	26	#include <asm/page.h>
	27	#include <linux/stringify.h>
	28
	29	/*
	30	* low level task data.
	31	*/
	32	struct thread_info {
	33	struct task_struct task; / main task structure */
	34	struct exec_domain exec_domain; / execution domain */
	35	int cpu; /* cpu we're on */
6cb7bfeb DG	36	int preempt_count; /* 0 => preemptable,
6cb7bfeb DG	37	<0 => BUG */
1da177e4	38	struct restart_block restart_block;
f39224a8 PM	39	unsigned long local_flags; /* private flags for thread */
f39224a8 PM	40
1da177e4 LT	41	/* low level flags - has atomic operations done on it */
	42	unsigned long flags ____cacheline_aligned_in_smp;
	43	};
	44
	45	/*
	46	* macros/functions for gaining access to the thread information structure
	47	*
	48	* preempt_count needs to be 1 initially, until the scheduler is functional.
	49	*/
	50	#define INIT_THREAD_INFO(tsk) \
	51	{ \
	52	.task = &tsk, \
	53	.exec_domain = &default_exec_domain, \
	54	.cpu = 0, \
	55	.preempt_count = 1, \
	56	.restart_block = { \
	57	.fn = do_no_restart_syscall, \
	58	}, \
	59	.flags = 0, \
	60	}
	61
	62	#define init_thread_info (init_thread_union.thread_info)
	63	#define init_stack (init_thread_union.stack)
	64
	65	/* thread information allocation */
	66
328985b2 DG	67	#if THREAD_SHIFT >= PAGE_SHIFT
328985b2 DG	68
b69c49b7	69	#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
328985b2 DG	70
	71	#else /* THREAD_SHIFT < PAGE_SHIFT */
	72
b69c49b7 FT	73	#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
b69c49b7 FT	74
f6a61680 BH	75	extern struct thread_info alloc_thread_info(struct task_struct tsk);
f6a61680 BH	76	extern void free_thread_info(struct thread_info *ti);
328985b2 DG	77
	78	#endif /* THREAD_SHIFT < PAGE_SHIFT */
	79
1da177e4 LT	80	/* how to get the thread information struct from C */
	81	static inline struct thread_info *current_thread_info(void)
	82	{
6cb7bfeb DG	83	register unsigned long sp asm("r1");
	84
	85	/* gcc4, at least, is smart enough to turn this into a single
	86	* rlwinm for ppc32 and clrrdi for ppc64 */
	87	return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
1da177e4 LT	88	}
	89
	90	#endif /* __ASSEMBLY__ */
	91
	92	#define PREEMPT_ACTIVE 0x10000000
	93
	94	/*
	95	* thread information flag bit numbers
	96	*/
	97	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	98	#define TIF_SIGPENDING 1 /* signal pending */
	99	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	100	#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
1da177e4	101	TIF_NEED_RESCHED */
a583f1b5 SE	102	#define TIF_32BIT 4 /* 32 bit binary */
	103	#define TIF_PERFMON_WORK 5 /* work for pfm_handle_work() */
	104	#define TIF_PERFMON_CTXSW 6 /* perfmon needs ctxsw calls */
	105	#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
	106	#define TIF_SINGLESTEP 8 /* singlestepping active */
	107	#define TIF_MEMDIE 9
	108	#define TIF_SECCOMP 10 /* secure computing */
	109	#define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
	110	#define TIF_NOERROR 12 /* Force successful syscall return */
7d6d637d	111	#define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
a583f1b5 SE	112	#define TIF_FREEZE 14 /* Freezing for suspend */
	113	#define TIF_RUNLATCH 15 /* Is the runlatch enabled? */
	114	#define TIF_ABI_PENDING 16 /* 32/64 bit switch needed */
1da177e4 LT	115
	116	/* as above, but as bit values */
	117	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
1da177e4 LT	118	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	119	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	120	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
	121	#define _TIF_32BIT (1<<TIF_32BIT)
f341973d AB	122	#define _TIF_PERFMON_WORK (1<<TIF_PERFMON_WORK)
f341973d AB	123	#define _TIF_PERFMON_CTXSW (1<<TIF_PERFMON_CTXSW)
1da177e4 LT	124	#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
	125	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
	126	#define _TIF_SECCOMP (1<<TIF_SECCOMP)
401d1f02	127	#define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
401d1f02	128	#define _TIF_NOERROR (1<<TIF_NOERROR)
7d6d637d	129	#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
8a102eed	130	#define _TIF_FREEZE (1<<TIF_FREEZE)
f341973d AB	131	#define _TIF_RUNLATCH (1<<TIF_RUNLATCH)
f341973d AB	132	#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
1da177e4 LT	133	#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE\|_TIF_SYSCALL_AUDIT\|_TIF_SECCOMP)
1da177e4 LT	134
7d6d637d RM	135	#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING \| _TIF_NEED_RESCHED \| \
7d6d637d RM	136	_TIF_NOTIFY_RESUME)
1bd79336	137	#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL\|_TIF_NOERROR)
1da177e4	138
f39224a8 PM	139	/* Bits in local_flags */
	140	/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
	141	#define TLF_NAPPING 0 /* idle thread enabled NAP mode */
a560643e PM	142	#define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
a560643e PM	143	#define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */
f39224a8 PM	144
f39224a8 PM	145	#define _TLF_NAPPING (1 << TLF_NAPPING)
a560643e	146	#define _TLF_SLEEPING (1 << TLF_SLEEPING)
7a10174e RM	147	#define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK)
	148
	149	#ifndef __ASSEMBLY__
	150	#define HAVE_SET_RESTORE_SIGMASK 1
	151	static inline void set_restore_sigmask(void)
	152	{
	153	struct thread_info *ti = current_thread_info();
	154	ti->local_flags \|= _TLF_RESTORE_SIGMASK;
	155	set_bit(TIF_SIGPENDING, &ti->flags);
	156	}
	157	#endif /* !__ASSEMBLY__ */
f39224a8	158
1da177e4 LT	159	#endif /* __KERNEL__ */
1da177e4 LT	160
6cb7bfeb	161	#endif /* _ASM_POWERPC_THREAD_INFO_H */