[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 */

#if defined(CONFIG_PPC64)
#define THREAD_SHIFT		14
#elif defined(CONFIG_PPC_256K_PAGES)
#define THREAD_SHIFT		15
#else
#define THREAD_SHIFT		13
#endif

#define THREAD_SIZE		(1 << THREAD_SHIFT)

#ifdef CONFIG_PPC64
#define CURRENT_THREAD_INFO(dest, sp)	stringify_in_c(clrrdi dest, sp, THREAD_SHIFT)
#else
#define CURRENT_THREAD_INFO(dest, sp)	stringify_in_c(rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT)
#endif

#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 */
	int		cpu;			/* cpu we're on */
	int		preempt_count;		/* 0 => preemptable,
						   <0 => BUG */
	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
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task =		&tsk,			\
	.cpu =		0,			\
	.preempt_count = INIT_PREEMPT_COUNT,	\
	.flags =	0,			\
}

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

#define THREAD_SIZE_ORDER	(THREAD_SHIFT - PAGE_SHIFT)

/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
	unsigned long val;

	asm (CURRENT_THREAD_INFO(%0,1) : "=r" (val));

	return (struct thread_info *)val;
}

#endif /* __ASSEMBLY__ */

/*
 * 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_RESTORE_TM		5	/* need to restore TM FP/VEC/VSX */
#define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */
#define TIF_SINGLESTEP		8	/* singlestepping active */
#define TIF_NOHZ		9	/* in adaptive nohz mode */
#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_UPROBE		14	/* breakpointed or single-stepping */
#define TIF_SYSCALL_TRACEPOINT	15	/* syscall tracepoint instrumentation */
#define TIF_EMULATE_STACK_STORE	16	/* Is an instruction emulation
						for stack store? */
#define TIF_MEMDIE		17	/* is terminating due to OOM killer */
#if defined(CONFIG_PPC64)
#define TIF_ELF2ABI		18	/* function descriptors must die! */
#endif

/* 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_RESTORE_TM		(1<<TIF_RESTORE_TM)
#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_UPROBE		(1<<TIF_UPROBE)
#define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)
#define _TIF_EMULATE_STACK_STORE	(1<<TIF_EMULATE_STACK_STORE)
#define _TIF_NOHZ		(1<<TIF_NOHZ)
#define _TIF_SYSCALL_DOTRACE	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
				 _TIF_SECCOMP | _TIF_SYSCALL_TRACEPOINT | \
				 _TIF_NOHZ)

#define _TIF_USER_WORK_MASK	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
				 _TIF_NOTIFY_RESUME | _TIF_UPROBE | \
				 _TIF_RESTORE_TM)
#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_LAZY_MMU		3	/* tlb_batch is active */
#define TLF_RUNLATCH		4	/* Is the runlatch enabled? */

#define _TLF_NAPPING		(1 << TLF_NAPPING)
#define _TLF_SLEEPING		(1 << TLF_SLEEPING)
#define _TLF_RESTORE_SIGMASK	(1 << TLF_RESTORE_SIGMASK)
#define _TLF_LAZY_MMU		(1 << TLF_LAZY_MMU)
#define _TLF_RUNLATCH		(1 << TLF_RUNLATCH)

#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;
	WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
}
static inline void clear_restore_sigmask(void)
{
	current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK;
}
static inline bool test_restore_sigmask(void)
{
	return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK;
}
static inline bool test_and_clear_restore_sigmask(void)
{
	struct thread_info *ti = current_thread_info();
	if (!(ti->local_flags & _TLF_RESTORE_SIGMASK))
		return false;
	ti->local_flags &= ~_TLF_RESTORE_SIGMASK;
	return true;
}

static inline bool test_thread_local_flags(unsigned int flags)
{
	struct thread_info *ti = current_thread_info();
	return (ti->local_flags & flags) != 0;
}

#ifdef CONFIG_PPC64
#define is_32bit_task()	(test_thread_flag(TIF_32BIT))
#else
#define is_32bit_task()	(1)
#endif

#if defined(CONFIG_PPC64)
#define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
#else
#define is_elf2_task() (0)
#endif

#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 */
6cb7bfeb DG	14
e1240122	15	#if defined(CONFIG_PPC64)
6cb7bfeb	16	#define THREAD_SHIFT 14
e1240122 YT	17	#elif defined(CONFIG_PPC_256K_PAGES)
e1240122 YT	18	#define THREAD_SHIFT 15
6cb7bfeb DG	19	#else
	20	#define THREAD_SHIFT 13
	21	#endif
	22
	23	#define THREAD_SIZE (1 << THREAD_SHIFT)
	24
9778b696	25	#ifdef CONFIG_PPC64
a87e810f	26	#define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(clrrdi dest, sp, THREAD_SHIFT)
9778b696	27	#else
a87e810f	28	#define CURRENT_THREAD_INFO(dest, sp) stringify_in_c(rlwinm dest, sp, 0, 0, 31-THREAD_SHIFT)
9778b696 SY	29	#endif
9778b696 SY	30
1da177e4	31	#ifndef __ASSEMBLY__
1da177e4 LT	32	#include <linux/cache.h>
	33	#include <asm/processor.h>
	34	#include <asm/page.h>
	35	#include <linux/stringify.h>
	36
	37	/*
	38	* low level task data.
	39	*/
	40	struct thread_info {
	41	struct task_struct task; / main task structure */
1da177e4	42	int cpu; /* cpu we're on */
6cb7bfeb DG	43	int preempt_count; /* 0 => preemptable,
6cb7bfeb DG	44	<0 => BUG */
f39224a8 PM	45	unsigned long local_flags; /* private flags for thread */
f39224a8 PM	46
1da177e4 LT	47	/* low level flags - has atomic operations done on it */
	48	unsigned long flags ____cacheline_aligned_in_smp;
	49	};
	50
	51	/*
	52	* macros/functions for gaining access to the thread information structure
1da177e4 LT	53	*/
	54	#define INIT_THREAD_INFO(tsk) \
	55	{ \
	56	.task = &tsk, \
1da177e4	57	.cpu = 0, \
c99e6efe	58	.preempt_count = INIT_PREEMPT_COUNT, \
1da177e4 LT	59	.flags = 0, \
	60	}
	61
	62	#define init_thread_info (init_thread_union.thread_info)
	63	#define init_stack (init_thread_union.stack)
	64
b69c49b7	65	#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
328985b2	66
1da177e4 LT	67	/* how to get the thread information struct from C */
	68	static inline struct thread_info *current_thread_info(void)
	69	{
a87e810f ME	70	unsigned long val;
	71
	72	asm (CURRENT_THREAD_INFO(%0,1) : "=r" (val));
	73
	74	return (struct thread_info *)val;
1da177e4 LT	75	}
	76
	77	#endif /* __ASSEMBLY__ */
	78
1da177e4 LT	79	/*
	80	* thread information flag bit numbers
	81	*/
	82	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	83	#define TIF_SIGPENDING 1 /* signal pending */
	84	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	85	#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
1da177e4	86	TIF_NEED_RESCHED */
a583f1b5	87	#define TIF_32BIT 4 /* 32 bit binary */
d31626f7	88	#define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */
a583f1b5 SE	89	#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
a583f1b5 SE	90	#define TIF_SINGLESTEP 8 /* singlestepping active */
22ecbe8d	91	#define TIF_NOHZ 9 /* in adaptive nohz mode */
a583f1b5 SE	92	#define TIF_SECCOMP 10 /* secure computing */
	93	#define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
	94	#define TIF_NOERROR 12 /* Force successful syscall return */
7d6d637d	95	#define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
8b7b80b9	96	#define TIF_UPROBE 14 /* breakpointed or single-stepping */
02424d89	97	#define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
f0d1128f TC	98	#define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation
f0d1128f TC	99	for stack store? */
22ecbe8d	100	#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
373c76d6 RR	101	#if defined(CONFIG_PPC64)
	102	#define TIF_ELF2ABI 18 /* function descriptors must die! */
	103	#endif
1da177e4 LT	104
	105	/* as above, but as bit values */
	106	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
1da177e4 LT	107	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	108	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	109	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
	110	#define _TIF_32BIT (1<<TIF_32BIT)
d31626f7	111	#define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM)
1da177e4 LT	112	#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
	113	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
	114	#define _TIF_SECCOMP (1<<TIF_SECCOMP)
401d1f02	115	#define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
401d1f02	116	#define _TIF_NOERROR (1<<TIF_NOERROR)
7d6d637d	117	#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
8b7b80b9	118	#define _TIF_UPROBE (1<<TIF_UPROBE)
02424d89	119	#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
f0d1128f	120	#define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
22ecbe8d	121	#define _TIF_NOHZ (1<<TIF_NOHZ)
10ea8343	122	#define _TIF_SYSCALL_DOTRACE (_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_AUDIT \| \
22ecbe8d LZ	123	_TIF_SECCOMP \| _TIF_SYSCALL_TRACEPOINT \| \
22ecbe8d LZ	124	_TIF_NOHZ)
1da177e4	125
7d6d637d	126	#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING \| _TIF_NEED_RESCHED \| \
d31626f7 PM	127	_TIF_NOTIFY_RESUME \| _TIF_UPROBE \| \
d31626f7 PM	128	_TIF_RESTORE_TM)
1bd79336	129	#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL\|_TIF_NOERROR)
1da177e4	130
f39224a8 PM	131	/* Bits in local_flags */
	132	/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
	133	#define TLF_NAPPING 0 /* idle thread enabled NAP mode */
a560643e PM	134	#define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
a560643e PM	135	#define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */
d6bf29b4	136	#define TLF_LAZY_MMU 3 /* tlb_batch is active */
fe1952fc	137	#define TLF_RUNLATCH 4 /* Is the runlatch enabled? */
f39224a8 PM	138
f39224a8 PM	139	#define _TLF_NAPPING (1 << TLF_NAPPING)
a560643e	140	#define _TLF_SLEEPING (1 << TLF_SLEEPING)
7a10174e	141	#define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK)
d6bf29b4	142	#define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
fe1952fc	143	#define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
7a10174e RM	144
	145	#ifndef __ASSEMBLY__
	146	#define HAVE_SET_RESTORE_SIGMASK 1
	147	static inline void set_restore_sigmask(void)
	148	{
	149	struct thread_info *ti = current_thread_info();
	150	ti->local_flags \|= _TLF_RESTORE_SIGMASK;
edd63a27	151	WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
7a10174e	152	}
4ebefe3e AV	153	static inline void clear_restore_sigmask(void)
	154	{
	155	current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK;
	156	}
	157	static inline bool test_restore_sigmask(void)
	158	{
	159	return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK;
	160	}
	161	static inline bool test_and_clear_restore_sigmask(void)
	162	{
	163	struct thread_info *ti = current_thread_info();
	164	if (!(ti->local_flags & _TLF_RESTORE_SIGMASK))
	165	return false;
	166	ti->local_flags &= ~_TLF_RESTORE_SIGMASK;
	167	return true;
	168	}
a465f9b6	169
fe1952fc BH	170	static inline bool test_thread_local_flags(unsigned int flags)
	171	{
	172	struct thread_info *ti = current_thread_info();
	173	return (ti->local_flags & flags) != 0;
	174	}
	175
a465f9b6 AB	176	#ifdef CONFIG_PPC64
	177	#define is_32bit_task() (test_thread_flag(TIF_32BIT))
	178	#else
	179	#define is_32bit_task() (1)
	180	#endif
	181
373c76d6 RR	182	#if defined(CONFIG_PPC64)
	183	#define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
	184	#else
	185	#define is_elf2_task() (0)
	186	#endif
	187
7a10174e	188	#endif /* !__ASSEMBLY__ */
f39224a8	189
1da177e4 LT	190	#endif /* __KERNEL__ */
1da177e4 LT	191
6cb7bfeb	192	#endif /* _ASM_POWERPC_THREAD_INFO_H */