[linux-2.6-block.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 */
	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
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task =		&tsk,			\
	.exec_domain =	&default_exec_domain,	\
	.cpu =		0,			\
	.preempt_count = INIT_PREEMPT_COUNT,	\
	.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)

#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_T_OR_A	(_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 */
	42	struct exec_domain exec_domain; / execution domain */
	43	int cpu; /* cpu we're on */
6cb7bfeb DG	44	int preempt_count; /* 0 => preemptable,
6cb7bfeb DG	45	<0 => BUG */
1da177e4	46	struct restart_block restart_block;
f39224a8 PM	47	unsigned long local_flags; /* private flags for thread */
f39224a8 PM	48
1da177e4 LT	49	/* low level flags - has atomic operations done on it */
	50	unsigned long flags ____cacheline_aligned_in_smp;
	51	};
	52
	53	/*
	54	* macros/functions for gaining access to the thread information structure
1da177e4 LT	55	*/
	56	#define INIT_THREAD_INFO(tsk) \
	57	{ \
	58	.task = &tsk, \
	59	.exec_domain = &default_exec_domain, \
	60	.cpu = 0, \
c99e6efe	61	.preempt_count = INIT_PREEMPT_COUNT, \
1da177e4 LT	62	.restart_block = { \
	63	.fn = do_no_restart_syscall, \
	64	}, \
	65	.flags = 0, \
	66	}
	67
	68	#define init_thread_info (init_thread_union.thread_info)
	69	#define init_stack (init_thread_union.stack)
	70
b69c49b7	71	#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
328985b2	72
1da177e4 LT	73	/* how to get the thread information struct from C */
	74	static inline struct thread_info *current_thread_info(void)
	75	{
a87e810f ME	76	unsigned long val;
	77
	78	asm (CURRENT_THREAD_INFO(%0,1) : "=r" (val));
	79
	80	return (struct thread_info *)val;
1da177e4 LT	81	}
	82
	83	#endif /* __ASSEMBLY__ */
	84
1da177e4 LT	85	/*
	86	* thread information flag bit numbers
	87	*/
	88	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	89	#define TIF_SIGPENDING 1 /* signal pending */
	90	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	91	#define TIF_POLLING_NRFLAG 3 /* true if poll_idle() is polling
1da177e4	92	TIF_NEED_RESCHED */
a583f1b5	93	#define TIF_32BIT 4 /* 32 bit binary */
d31626f7	94	#define TIF_RESTORE_TM 5 /* need to restore TM FP/VEC/VSX */
a583f1b5 SE	95	#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
a583f1b5 SE	96	#define TIF_SINGLESTEP 8 /* singlestepping active */
22ecbe8d	97	#define TIF_NOHZ 9 /* in adaptive nohz mode */
a583f1b5 SE	98	#define TIF_SECCOMP 10 /* secure computing */
	99	#define TIF_RESTOREALL 11 /* Restore all regs (implies NOERROR) */
	100	#define TIF_NOERROR 12 /* Force successful syscall return */
7d6d637d	101	#define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
8b7b80b9	102	#define TIF_UPROBE 14 /* breakpointed or single-stepping */
02424d89	103	#define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
f0d1128f TC	104	#define TIF_EMULATE_STACK_STORE 16 /* Is an instruction emulation
f0d1128f TC	105	for stack store? */
22ecbe8d	106	#define TIF_MEMDIE 17 /* is terminating due to OOM killer */
373c76d6 RR	107	#if defined(CONFIG_PPC64)
	108	#define TIF_ELF2ABI 18 /* function descriptors must die! */
	109	#endif
1da177e4 LT	110
	111	/* as above, but as bit values */
	112	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
1da177e4 LT	113	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	114	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	115	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
	116	#define _TIF_32BIT (1<<TIF_32BIT)
d31626f7	117	#define _TIF_RESTORE_TM (1<<TIF_RESTORE_TM)
1da177e4 LT	118	#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
	119	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
	120	#define _TIF_SECCOMP (1<<TIF_SECCOMP)
401d1f02	121	#define _TIF_RESTOREALL (1<<TIF_RESTOREALL)
401d1f02	122	#define _TIF_NOERROR (1<<TIF_NOERROR)
7d6d637d	123	#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
8b7b80b9	124	#define _TIF_UPROBE (1<<TIF_UPROBE)
02424d89	125	#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
f0d1128f	126	#define _TIF_EMULATE_STACK_STORE (1<<TIF_EMULATE_STACK_STORE)
22ecbe8d	127	#define _TIF_NOHZ (1<<TIF_NOHZ)
02424d89	128	#define _TIF_SYSCALL_T_OR_A (_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_AUDIT \| \
22ecbe8d LZ	129	_TIF_SECCOMP \| _TIF_SYSCALL_TRACEPOINT \| \
22ecbe8d LZ	130	_TIF_NOHZ)
1da177e4	131
7d6d637d	132	#define _TIF_USER_WORK_MASK (_TIF_SIGPENDING \| _TIF_NEED_RESCHED \| \
d31626f7 PM	133	_TIF_NOTIFY_RESUME \| _TIF_UPROBE \| \
d31626f7 PM	134	_TIF_RESTORE_TM)
1bd79336	135	#define _TIF_PERSYSCALL_MASK (_TIF_RESTOREALL\|_TIF_NOERROR)
1da177e4	136
f39224a8 PM	137	/* Bits in local_flags */
	138	/* Don't move TLF_NAPPING without adjusting the code in entry_32.S */
	139	#define TLF_NAPPING 0 /* idle thread enabled NAP mode */
a560643e PM	140	#define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
a560643e PM	141	#define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */
d6bf29b4	142	#define TLF_LAZY_MMU 3 /* tlb_batch is active */
fe1952fc	143	#define TLF_RUNLATCH 4 /* Is the runlatch enabled? */
f39224a8 PM	144
f39224a8 PM	145	#define _TLF_NAPPING (1 << TLF_NAPPING)
a560643e	146	#define _TLF_SLEEPING (1 << TLF_SLEEPING)
7a10174e	147	#define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK)
d6bf29b4	148	#define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
fe1952fc	149	#define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
7a10174e RM	150
	151	#ifndef __ASSEMBLY__
	152	#define HAVE_SET_RESTORE_SIGMASK 1
	153	static inline void set_restore_sigmask(void)
	154	{
	155	struct thread_info *ti = current_thread_info();
	156	ti->local_flags \|= _TLF_RESTORE_SIGMASK;
edd63a27	157	WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
7a10174e	158	}
4ebefe3e AV	159	static inline void clear_restore_sigmask(void)
	160	{
	161	current_thread_info()->local_flags &= ~_TLF_RESTORE_SIGMASK;
	162	}
	163	static inline bool test_restore_sigmask(void)
	164	{
	165	return current_thread_info()->local_flags & _TLF_RESTORE_SIGMASK;
	166	}
	167	static inline bool test_and_clear_restore_sigmask(void)
	168	{
	169	struct thread_info *ti = current_thread_info();
	170	if (!(ti->local_flags & _TLF_RESTORE_SIGMASK))
	171	return false;
	172	ti->local_flags &= ~_TLF_RESTORE_SIGMASK;
	173	return true;
	174	}
a465f9b6	175
fe1952fc BH	176	static inline bool test_thread_local_flags(unsigned int flags)
	177	{
	178	struct thread_info *ti = current_thread_info();
	179	return (ti->local_flags & flags) != 0;
	180	}
	181
a465f9b6 AB	182	#ifdef CONFIG_PPC64
	183	#define is_32bit_task() (test_thread_flag(TIF_32BIT))
	184	#else
	185	#define is_32bit_task() (1)
	186	#endif
	187
373c76d6 RR	188	#if defined(CONFIG_PPC64)
	189	#define is_elf2_task() (test_thread_flag(TIF_ELF2ABI))
	190	#else
	191	#define is_elf2_task() (0)
	192	#endif
	193
7a10174e	194	#endif /* !__ASSEMBLY__ */
f39224a8	195
1da177e4 LT	196	#endif /* __KERNEL__ */
1da177e4 LT	197
6cb7bfeb	198	#endif /* _ASM_POWERPC_THREAD_INFO_H */