[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 */
	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 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
	bool in_backtrace;			/* currently doing backtrace? */
};

/*
 * macros/functions for gaining access to the thread information structure.
 */
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.flags		= 0,			\
	.cpu		= 0,			\
	.preempt_count	= INIT_PREEMPT_COUNT,	\
	.addr_limit	= KERNEL_DS,		\
	.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_stack(unsigned long *stack);

/* 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_POLLING_NRFLAG	10	/* idle is polling for TIF_NEED_RESCHED */
#define TIF_NOHZ		11	/* in adaptive nohz mode */

#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)
#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
#define _TIF_NOHZ		(1<<TIF_NOHZ)

/* Work to do as we loop to exit to user space. */
#define _TIF_WORK_MASK \
	(_TIF_SIGPENDING | _TIF_NEED_RESCHED | \
	 _TIF_ASYNC_TLB | _TIF_NOTIFY_RESUME)

/* Work to do on any return to user space. */
#define _TIF_ALLWORK_MASK \
	(_TIF_WORK_MASK | _TIF_SINGLESTEP | _TIF_NOHZ)

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

/* 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

#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 */
867e359b CM	29	unsigned long flags; /* low level flags */
	30	unsigned long status; /* thread-synchronous flags */
	31	__u32 homecache_cpu; /* CPU we are homecached on */
	32	__u32 cpu; /* current CPU */
	33	int preempt_count; /* 0 => preemptable,
	34	<0 => BUG */
	35
	36	mm_segment_t addr_limit; /* thread address space
	37	(KERNEL_DS or USER_DS) */
867e359b CM	38	struct single_step_state step_state; / single step state
867e359b CM	39	(if non-zero) */
2f9ac29e CM	40	int align_ctl; /* controls unaligned access */
	41	#ifdef __tilegx__
	42	unsigned long unalign_jit_tmp[4]; /* temp r0..r3 storage */
	43	void __user unalign_jit_base; / unalign fixup JIT base */
	44	#endif
47ad7b9b	45	bool in_backtrace; /* currently doing backtrace? */
867e359b CM	46	};
	47
	48	/*
	49	* macros/functions for gaining access to the thread information structure.
	50	*/
	51	#define INIT_THREAD_INFO(tsk) \
	52	{ \
	53	.task = &tsk, \
867e359b CM	54	.flags = 0, \
	55	.cpu = 0, \
	56	.preempt_count = INIT_PREEMPT_COUNT, \
	57	.addr_limit = KERNEL_DS, \
0707ad30	58	.step_state = NULL, \
2f9ac29e	59	.align_ctl = 0, \
867e359b CM	60	}
	61
	62	#define init_thread_info (init_thread_union.thread_info)
	63	#define init_stack (init_thread_union.stack)
	64
	65	#endif /* !__ASSEMBLY__ */
	66
	67	#if PAGE_SIZE < 8192
	68	#define THREAD_SIZE_ORDER (13 - PAGE_SHIFT)
	69	#else
	70	#define THREAD_SIZE_ORDER (0)
	71	#endif
76c567fb	72	#define THREAD_SIZE_PAGES (1 << THREAD_SIZE_ORDER)
867e359b CM	73
	74	#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
	75	#define LOG2_THREAD_SIZE (PAGE_SHIFT + THREAD_SIZE_ORDER)
	76
	77	#define STACK_WARN (THREAD_SIZE/8)
	78
	79	#ifndef __ASSEMBLY__
	80
b235beea	81	void arch_release_thread_stack(unsigned long *stack);
d909a81b	82
867e359b CM	83	/* How to get the thread information struct from C. */
	84	register unsigned long stack_pointer __asm__("sp");
	85
	86	#define current_thread_info() \
	87	((struct thread_info *)(stack_pointer & -THREAD_SIZE))
	88
0707ad30 CM	89	/* Sit on a nap instruction until interrupted. */
	90	extern void smp_nap(void);
	91
ba159fd3	92	/* Enable interrupts racelessly and nap forever: helper for arch_cpu_idle(). */
0707ad30 CM	93	extern void _cpu_idle(void);
0707ad30 CM	94
867e359b CM	95	#else /* __ASSEMBLY__ */
867e359b CM	96
fc327e26 CM	97	/*
	98	* How to get the thread information struct from assembly.
	99	* Note that we use different macros since different architectures
	100	* have different semantics in their "mm" instruction and we would
	101	* like to guarantee that the macro expands to exactly one instruction.
	102	*/
867e359b	103	#ifdef __tilegx__
fc327e26	104	#define EXTRACT_THREAD_INFO(reg) mm reg, zero, LOG2_THREAD_SIZE, 63
867e359b CM	105	#else
	106	#define GET_THREAD_INFO(reg) mm reg, sp, zero, LOG2_THREAD_SIZE, 31
	107	#endif
	108
	109	#endif /* !__ASSEMBLY__ */
	110
867e359b CM	111	/*
	112	* Thread information flags that various assembly files may need to access.
	113	* Keep flags accessed frequently in low bits, particular since it makes
	114	* it easier to build constants in assembly.
	115	*/
	116	#define TIF_SIGPENDING 0 /* signal pending */
	117	#define TIF_NEED_RESCHED 1 /* rescheduling necessary */
	118	#define TIF_SINGLESTEP 2 /* restore singlestep on return to
	119	user mode */
	120	#define TIF_ASYNC_TLB 3 /* got an async TLB fault in kernel */
	121	#define TIF_SYSCALL_TRACE 4 /* syscall trace active */
	122	#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
	123	#define TIF_SECCOMP 6 /* secure computing */
	124	#define TIF_MEMDIE 7 /* OOM killer at work */
313ce674	125	#define TIF_NOTIFY_RESUME 8 /* callback before returning to user */
ef567f25	126	#define TIF_SYSCALL_TRACEPOINT 9 /* syscall tracepoint instrumentation */
b3a8cb18	127	#define TIF_POLLING_NRFLAG 10 /* idle is polling for TIF_NEED_RESCHED */
49e4e156	128	#define TIF_NOHZ 11 /* in adaptive nohz mode */
867e359b CM	129
	130	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	131	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	132	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
	133	#define _TIF_ASYNC_TLB (1<<TIF_ASYNC_TLB)
	134	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
	135	#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
	136	#define _TIF_SECCOMP (1<<TIF_SECCOMP)
	137	#define _TIF_MEMDIE (1<<TIF_MEMDIE)
313ce674	138	#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
ef567f25	139	#define _TIF_SYSCALL_TRACEPOINT (1<<TIF_SYSCALL_TRACEPOINT)
b3a8cb18	140	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
49e4e156	141	#define _TIF_NOHZ (1<<TIF_NOHZ)
867e359b	142
583b24a2 CM	143	/* Work to do as we loop to exit to user space. */
	144	#define _TIF_WORK_MASK \
	145	(_TIF_SIGPENDING \| _TIF_NEED_RESCHED \| \
	146	_TIF_ASYNC_TLB \| _TIF_NOTIFY_RESUME)
	147
867e359b CM	148	/* Work to do on any return to user space. */
867e359b CM	149	#define _TIF_ALLWORK_MASK \
583b24a2	150	(_TIF_WORK_MASK \| _TIF_SINGLESTEP \| _TIF_NOHZ)
867e359b	151
ef567f25	152	/* Work to do at syscall entry. */
49e4e156 CM	153	#define _TIF_SYSCALL_ENTRY_WORK \
49e4e156 CM	154	(_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_TRACEPOINT \| _TIF_NOHZ)
ef567f25 SM	155
	156	/* Work to do at syscall exit. */
	157	#define _TIF_SYSCALL_EXIT_WORK (_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_TRACEPOINT)
	158
867e359b CM	159	/*
	160	* Thread-synchronous status.
	161	*
	162	* This is different from the flags in that nobody else
	163	* ever touches our thread-synchronous status, so we don't
	164	* have to worry about atomic accesses.
	165	*/
	166	#ifdef __tilegx__
	167	#define TS_COMPAT 0x0001 /* 32-bit compatibility mode */
	168	#endif
867e359b CM	169
867e359b CM	170	#endif /* _ASM_TILE_THREAD_INFO_H */