[deliverable/linux.git] / arch / tile / include / asm / thread_info.h

/*
 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
 * Copyright 2010 Tilera Corporation. All Rights Reserved.
 *
 *   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, version 2.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 */

#ifndef _ASM_TILE_THREAD_INFO_H
#define _ASM_TILE_THREAD_INFO_H

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

/*
 * Low level task data that assembly code needs immediate access to.
 * The structure is placed at the bottom of the supervisor stack.
 */
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			homecache_cpu;	/* CPU we are homecached on */
	__u32			cpu;		/* current CPU */
	int			preempt_count;	/* 0 => preemptable,
						   <0 => BUG */

	mm_segment_t		addr_limit;	/* thread address space
						   (KERNEL_DS or USER_DS) */
	struct restart_block	restart_block;
	struct single_step_state *step_state;	/* single step state
						   (if non-zero) */
	int			align_ctl;	/* controls unaligned access */
#ifdef __tilegx__
	unsigned long		unalign_jit_tmp[4]; /* temp r0..r3 storage */
	void __user		*unalign_jit_base; /* unalign fixup JIT base */
#endif
};

/*
 * macros/functions for gaining access to the thread information structure.
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.exec_domain	= &default_exec_domain,	\
	.flags		= 0,			\
	.cpu		= 0,			\
	.preempt_count	= INIT_PREEMPT_COUNT,	\
	.addr_limit	= KERNEL_DS,		\
	.restart_block	= {			\
		.fn = do_no_restart_syscall,	\
	},					\
	.step_state	= NULL,			\
	.align_ctl	= 0,			\
}

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

#endif /* !__ASSEMBLY__ */

#if PAGE_SIZE < 8192
#define THREAD_SIZE_ORDER (13 - PAGE_SHIFT)
#else
#define THREAD_SIZE_ORDER (0)
#endif
#define THREAD_SIZE_PAGES (1 << THREAD_SIZE_ORDER)

#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
#define LOG2_THREAD_SIZE (PAGE_SHIFT + THREAD_SIZE_ORDER)

#define STACK_WARN             (THREAD_SIZE/8)

#ifndef __ASSEMBLY__

void arch_release_thread_info(struct thread_info *info);

/* How to get the thread information struct from C. */
register unsigned long stack_pointer __asm__("sp");

#define current_thread_info() \
  ((struct thread_info *)(stack_pointer & -THREAD_SIZE))

/* Sit on a nap instruction until interrupted. */
extern void smp_nap(void);

/* Enable interrupts racelessly and nap forever: helper for arch_cpu_idle(). */
extern void _cpu_idle(void);

#else /* __ASSEMBLY__ */

/*
 * How to get the thread information struct from assembly.
 * Note that we use different macros since different architectures
 * have different semantics in their "mm" instruction and we would
 * like to guarantee that the macro expands to exactly one instruction.
 */
#ifdef __tilegx__
#define EXTRACT_THREAD_INFO(reg) mm reg, zero, LOG2_THREAD_SIZE, 63
#else
#define GET_THREAD_INFO(reg) mm reg, sp, zero, LOG2_THREAD_SIZE, 31
#endif

#endif /* !__ASSEMBLY__ */

/*
 * Thread information flags that various assembly files may need to access.
 * Keep flags accessed frequently in low bits, particular since it makes
 * it easier to build constants in assembly.
 */
#define TIF_SIGPENDING		0	/* signal pending */
#define TIF_NEED_RESCHED	1	/* rescheduling necessary */
#define TIF_SINGLESTEP		2	/* restore singlestep on return to
					   user mode */
#define TIF_ASYNC_TLB		3	/* got an async TLB fault in kernel */
#define TIF_SYSCALL_TRACE	4	/* syscall trace active */
#define TIF_SYSCALL_AUDIT	5	/* syscall auditing active */
#define TIF_SECCOMP		6	/* secure computing */
#define TIF_MEMDIE		7	/* OOM killer at work */
#define TIF_NOTIFY_RESUME	8	/* callback before returning to user */
#define TIF_SYSCALL_TRACEPOINT	9	/* syscall tracepoint instrumentation */

#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
#define _TIF_ASYNC_TLB		(1<<TIF_ASYNC_TLB)
#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
#define _TIF_MEMDIE		(1<<TIF_MEMDIE)
#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
#define _TIF_SYSCALL_TRACEPOINT	(1<<TIF_SYSCALL_TRACEPOINT)

/* Work to do on any return to user space. */
#define _TIF_ALLWORK_MASK \
  (_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SINGLESTEP|\
   _TIF_ASYNC_TLB|_TIF_NOTIFY_RESUME)

/* Work to do at syscall entry. */
#define _TIF_SYSCALL_ENTRY_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT)

/* Work to do at syscall exit. */
#define _TIF_SYSCALL_EXIT_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT)

/*
 * 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.
 */
#ifdef __tilegx__
#define TS_COMPAT		0x0001	/* 32-bit compatibility mode */
#endif
#define TS_POLLING		0x0004	/* in idle loop but not sleeping */
#define TS_RESTORE_SIGMASK	0x0008	/* restore signal mask in do_signal */

#ifndef __ASSEMBLY__
#define HAVE_SET_RESTORE_SIGMASK	1
static inline void set_restore_sigmask(void)
{
	struct thread_info *ti = current_thread_info();
	ti->status |= TS_RESTORE_SIGMASK;
	WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
}
static inline void clear_restore_sigmask(void)
{
	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
}
static inline bool test_restore_sigmask(void)
{
	return current_thread_info()->status & TS_RESTORE_SIGMASK;
}
static inline bool test_and_clear_restore_sigmask(void)
{
	struct thread_info *ti = current_thread_info();
	if (!(ti->status & TS_RESTORE_SIGMASK))
		return false;
	ti->status &= ~TS_RESTORE_SIGMASK;
	return true;
}
#endif	/* !__ASSEMBLY__ */

#endif /* _ASM_TILE_THREAD_INFO_H */
Commit	Line	Data
867e359b CM	1	/*
	2	* Copyright (C) 2002 David Howells (dhowells@redhat.com)
	3	* Copyright 2010 Tilera Corporation. All Rights Reserved.
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public License
	7	* as published by the Free Software Foundation, version 2.
	8	*
	9	* This program is distributed in the hope that it will be useful, but
	10	* WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	12	* NON INFRINGEMENT. See the GNU General Public License for
	13	* more details.
	14	*/
	15
	16	#ifndef _ASM_TILE_THREAD_INFO_H
	17	#define _ASM_TILE_THREAD_INFO_H
	18
	19	#include <asm/processor.h>
	20	#include <asm/page.h>
	21	#ifndef __ASSEMBLY__
	22
	23	/*
	24	* Low level task data that assembly code needs immediate access to.
	25	* The structure is placed at the bottom of the supervisor stack.
	26	*/
	27	struct thread_info {
	28	struct task_struct task; / main task structure */
	29	struct exec_domain exec_domain; / execution domain */
	30	unsigned long flags; /* low level flags */
	31	unsigned long status; /* thread-synchronous flags */
	32	__u32 homecache_cpu; /* CPU we are homecached on */
	33	__u32 cpu; /* current CPU */
	34	int preempt_count; /* 0 => preemptable,
	35	<0 => BUG */
	36
	37	mm_segment_t addr_limit; /* thread address space
	38	(KERNEL_DS or USER_DS) */
	39	struct restart_block restart_block;
	40	struct single_step_state step_state; / single step state
	41	(if non-zero) */
2f9ac29e CM	42	int align_ctl; /* controls unaligned access */
	43	#ifdef __tilegx__
	44	unsigned long unalign_jit_tmp[4]; /* temp r0..r3 storage */
	45	void __user unalign_jit_base; / unalign fixup JIT base */
	46	#endif
867e359b CM	47	};
	48
	49	/*
	50	* macros/functions for gaining access to the thread information structure.
	51	*/
	52	#define INIT_THREAD_INFO(tsk) \
	53	{ \
	54	.task = &tsk, \
	55	.exec_domain = &default_exec_domain, \
	56	.flags = 0, \
	57	.cpu = 0, \
	58	.preempt_count = INIT_PREEMPT_COUNT, \
	59	.addr_limit = KERNEL_DS, \
	60	.restart_block = { \
	61	.fn = do_no_restart_syscall, \
	62	}, \
0707ad30	63	.step_state = NULL, \
2f9ac29e	64	.align_ctl = 0, \
867e359b CM	65	}
	66
	67	#define init_thread_info (init_thread_union.thread_info)
	68	#define init_stack (init_thread_union.stack)
	69
	70	#endif /* !__ASSEMBLY__ */
	71
	72	#if PAGE_SIZE < 8192
	73	#define THREAD_SIZE_ORDER (13 - PAGE_SHIFT)
	74	#else
	75	#define THREAD_SIZE_ORDER (0)
	76	#endif
76c567fb	77	#define THREAD_SIZE_PAGES (1 << THREAD_SIZE_ORDER)
867e359b CM	78
	79	#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
	80	#define LOG2_THREAD_SIZE (PAGE_SHIFT + THREAD_SIZE_ORDER)
	81
	82	#define STACK_WARN (THREAD_SIZE/8)
	83
	84	#ifndef __ASSEMBLY__
	85
d909a81b TG	86	void arch_release_thread_info(struct thread_info *info);
d909a81b TG	87
867e359b CM	88	/* How to get the thread information struct from C. */
	89	register unsigned long stack_pointer __asm__("sp");
	90
	91	#define current_thread_info() \
	92	((struct thread_info *)(stack_pointer & -THREAD_SIZE))
	93
0707ad30 CM	94	/* Sit on a nap instruction until interrupted. */
	95	extern void smp_nap(void);
	96
ba159fd3	97	/* Enable interrupts racelessly and nap forever: helper for arch_cpu_idle(). */
0707ad30 CM	98	extern void _cpu_idle(void);
0707ad30 CM	99
867e359b CM	100	#else /* __ASSEMBLY__ */
867e359b CM	101
fc327e26 CM	102	/*
	103	* How to get the thread information struct from assembly.
	104	* Note that we use different macros since different architectures
	105	* have different semantics in their "mm" instruction and we would
	106	* like to guarantee that the macro expands to exactly one instruction.
	107	*/
867e359b	108	#ifdef __tilegx__
fc327e26	109	#define EXTRACT_THREAD_INFO(reg) mm reg, zero, LOG2_THREAD_SIZE, 63
867e359b CM	110	#else
	111	#define GET_THREAD_INFO(reg) mm reg, sp, zero, LOG2_THREAD_SIZE, 31
	112	#endif
	113
	114	#endif /* !__ASSEMBLY__ */
	115
867e359b CM	116	/*
	117	* Thread information flags that various assembly files may need to access.
	118	* Keep flags accessed frequently in low bits, particular since it makes
	119	* it easier to build constants in assembly.
	120	*/
	121	#define TIF_SIGPENDING 0 /* signal pending */
	122	#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
	123	#define TIF_SINGLESTEP 2 /* restore singlestep on return to
	124	user mode */
	125	#define TIF_ASYNC_TLB 3 /* got an async TLB fault in kernel */
	126	#define TIF_SYSCALL_TRACE 4 /* syscall trace active */
	127	#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
	128	#define TIF_SECCOMP 6 /* secure computing */
	129	#define TIF_MEMDIE 7 /* OOM killer at work */
313ce674	130	#define TIF_NOTIFY_RESUME 8 /* callback before returning to user */
ef567f25	131	#define TIF_SYSCALL_TRACEPOINT 9 /* syscall tracepoint instrumentation */
867e359b CM	132
	133	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	134	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	135	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
	136	#define _TIF_ASYNC_TLB (1<<TIF_ASYNC_TLB)
	137	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
	138	#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
	139	#define _TIF_SECCOMP (1<<TIF_SECCOMP)
	140	#define _TIF_MEMDIE (1<<TIF_MEMDIE)
313ce674	141	#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
ef567f25	142	#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
867e359b CM	143
	144	/* Work to do on any return to user space. */
	145	#define _TIF_ALLWORK_MASK \
313ce674 CM	146	(_TIF_SIGPENDING\|_TIF_NEED_RESCHED\|_TIF_SINGLESTEP\|\
313ce674 CM	147	_TIF_ASYNC_TLB\|_TIF_NOTIFY_RESUME)
867e359b	148
ef567f25 SM	149	/* Work to do at syscall entry. */
	150	#define _TIF_SYSCALL_ENTRY_WORK (_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_TRACEPOINT)
	151
	152	/* Work to do at syscall exit. */
	153	#define _TIF_SYSCALL_EXIT_WORK (_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_TRACEPOINT)
	154
867e359b CM	155	/*
	156	* Thread-synchronous status.
	157	*
	158	* This is different from the flags in that nobody else
	159	* ever touches our thread-synchronous status, so we don't
	160	* have to worry about atomic accesses.
	161	*/
	162	#ifdef __tilegx__
	163	#define TS_COMPAT 0x0001 /* 32-bit compatibility mode */
	164	#endif
	165	#define TS_POLLING 0x0004 /* in idle loop but not sleeping */
	166	#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal */
867e359b	167
867e359b CM	168	#ifndef __ASSEMBLY__
	169	#define HAVE_SET_RESTORE_SIGMASK 1
	170	static inline void set_restore_sigmask(void)
	171	{
	172	struct thread_info *ti = current_thread_info();
	173	ti->status \|= TS_RESTORE_SIGMASK;
edd63a27	174	WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
867e359b	175	}
4ebefe3e AV	176	static inline void clear_restore_sigmask(void)
	177	{
	178	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
	179	}
	180	static inline bool test_restore_sigmask(void)
	181	{
	182	return current_thread_info()->status & TS_RESTORE_SIGMASK;
	183	}
	184	static inline bool test_and_clear_restore_sigmask(void)
	185	{
	186	struct thread_info *ti = current_thread_info();
	187	if (!(ti->status & TS_RESTORE_SIGMASK))
	188	return false;
	189	ti->status &= ~TS_RESTORE_SIGMASK;
	190	return true;
	191	}
867e359b CM	192	#endif /* !__ASSEMBLY__ */
	193
	194	#endif /* _ASM_TILE_THREAD_INFO_H */