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

#ifndef __ASM_SH_THREAD_INFO_H
#define __ASM_SH_THREAD_INFO_H

/* SuperH version
 * Copyright (C) 2002  Niibe Yutaka
 *
 * The copyright of original i386 version is:
 *
 *  Copyright (C) 2002  David Howells (dhowells@redhat.com)
 *  - Incorporating suggestions made by Linus Torvalds and Dave Miller
 */
#ifdef __KERNEL__
#include <asm/page.h>

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

struct thread_info {
	struct task_struct	*task;		/* main task structure */
	struct exec_domain	*exec_domain;	/* execution domain */
	unsigned long		flags;		/* low level flags */
	__u32			cpu;
	int			preempt_count; /* 0 => preemptable, <0 => BUG */
	mm_segment_t		addr_limit;	/* thread address space */
	struct restart_block	restart_block;
	unsigned long		previous_sp;	/* sp of previous stack in case
						   of nested IRQ stacks */
	__u8			supervisor_stack[0];
};

#endif

#define PREEMPT_ACTIVE		0x10000000

#if defined(CONFIG_4KSTACKS)
#define THREAD_SHIFT	12
#else
#define THREAD_SHIFT	13
#endif

#define THREAD_SIZE	(1 << THREAD_SHIFT)
#define STACK_WARN	(THREAD_SIZE >> 3)

/*
 * macros/functions for gaining access to the thread information structure
 */
#ifndef __ASSEMBLY__
#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.exec_domain	= &default_exec_domain,	\
	.flags		= 0,			\
	.cpu		= 0,			\
	.preempt_count	= 1,			\
	.addr_limit	= KERNEL_DS,		\
	.restart_block	= {			\
		.fn = do_no_restart_syscall,	\
	},					\
}

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

/* how to get the current stack pointer from C */
register unsigned long current_stack_pointer asm("r15") __used;

/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
	struct thread_info *ti;
#if defined(CONFIG_SUPERH64)
	__asm__ __volatile__ ("getcon	cr17, %0" : "=r" (ti));
#elif defined(CONFIG_CPU_HAS_SR_RB)
	__asm__ __volatile__ ("stc	r7_bank, %0" : "=r" (ti));
#else
	unsigned long __dummy;

	__asm__ __volatile__ (
		"mov	r15, %0\n\t"
		"and	%1, %0\n\t"
		: "=&r" (ti), "=r" (__dummy)
		: "1" (~(THREAD_SIZE - 1))
		: "memory");
#endif

	return ti;
}

/* 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 */

#endif /* __ASSEMBLY__ */

/*
 * thread information flags
 * - these are process state flags that various assembly files may need to access
 * - pending work-to-be-done flags are in LSW
 * - other flags in MSW
 */
#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
#define TIF_SIGPENDING		1	/* signal pending */
#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
#define TIF_RESTORE_SIGMASK	3	/* restore signal mask in do_signal() */
#define TIF_SINGLESTEP		4	/* singlestepping active */
#define TIF_SYSCALL_AUDIT	5	/* syscall auditing active */
#define TIF_SECCOMP		6	/* secure computing */
#define TIF_NOTIFY_RESUME	7	/* callback before returning to user */
#define TIF_USEDFPU		16	/* FPU was used by this task this quantum (SMP) */
#define TIF_POLLING_NRFLAG	17	/* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE		18
#define TIF_FREEZE		19	/* Freezing for suspend */

#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
#define _TIF_USEDFPU		(1 << TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
#define _TIF_FREEZE		(1 << TIF_FREEZE)

/*
 * _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within a byte, or we
 * blow the tst immediate size constraints and need to fix up
 * arch/sh/kernel/entry-common.S.
 */

/* work to do in syscall trace */
#define _TIF_WORK_SYSCALL_MASK	(_TIF_SYSCALL_TRACE | _TIF_SINGLESTEP | \
				 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP)

/* work to do on any return to u-space */
#define _TIF_ALLWORK_MASK	(_TIF_SYSCALL_TRACE | _TIF_SIGPENDING      | \
				 _TIF_NEED_RESCHED  | _TIF_SYSCALL_AUDIT   | \
				 _TIF_SINGLESTEP    | _TIF_RESTORE_SIGMASK | \
				 _TIF_NOTIFY_RESUME)

/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK		(_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE | \
				 _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP))

#endif /* __KERNEL__ */

#endif /* __ASM_SH_THREAD_INFO_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef __ASM_SH_THREAD_INFO_H
	2	#define __ASM_SH_THREAD_INFO_H
	3
	4	/* SuperH version
	5	* Copyright (C) 2002 Niibe Yutaka
	6	*
	7	* The copyright of original i386 version is:
	8	*
	9	* Copyright (C) 2002 David Howells (dhowells@redhat.com)
	10	* - Incorporating suggestions made by Linus Torvalds and Dave Miller
	11	*/
1da177e4	12	#ifdef __KERNEL__
a6a31139	13	#include <asm/page.h>
1da177e4 LT	14
	15	#ifndef __ASSEMBLY__
	16	#include <asm/processor.h>
	17
	18	struct thread_info {
	19	struct task_struct task; / main task structure */
	20	struct exec_domain exec_domain; / execution domain */
6ecf66ae	21	unsigned long flags; /* low level flags */
1da177e4	22	__u32 cpu;
dcd497f9	23	int preempt_count; /* 0 => preemptable, <0 => BUG */
2991be72	24	mm_segment_t addr_limit; /* thread address space */
1da177e4	25	struct restart_block restart_block;
a6a31139 PM	26	unsigned long previous_sp; /* sp of previous stack in case
a6a31139 PM	27	of nested IRQ stacks */
1da177e4 LT	28	__u8 supervisor_stack[0];
	29	};
	30
	31	#endif
	32
37053cc8	33	#define PREEMPT_ACTIVE 0x10000000
a6a31139	34
7a847f81	35	#if defined(CONFIG_4KSTACKS)
c15c5f8c	36	#define THREAD_SHIFT 12
a6a31139	37	#else
c15c5f8c	38	#define THREAD_SHIFT 13
a6a31139	39	#endif
7a847f81	40
c15c5f8c	41	#define THREAD_SIZE (1 << THREAD_SHIFT)
7a847f81	42	#define STACK_WARN (THREAD_SIZE >> 3)
1da177e4 LT	43
	44	/*
	45	* macros/functions for gaining access to the thread information structure
	46	*/
	47	#ifndef __ASSEMBLY__
	48	#define INIT_THREAD_INFO(tsk) \
	49	{ \
	50	.task = &tsk, \
	51	.exec_domain = &default_exec_domain, \
	52	.flags = 0, \
	53	.cpu = 0, \
	54	.preempt_count = 1, \
2991be72	55	.addr_limit = KERNEL_DS, \
1da177e4 LT	56	.restart_block = { \
	57	.fn = do_no_restart_syscall, \
	58	}, \
	59	}
	60
	61	#define init_thread_info (init_thread_union.thread_info)
	62	#define init_stack (init_thread_union.stack)
	63
a6a31139	64	/* how to get the current stack pointer from C */
3ff6eecc	65	register unsigned long current_stack_pointer asm("r15") __used;
a6a31139	66
1da177e4 LT	67	/* how to get the thread information struct from C */
	68	static inline struct thread_info *current_thread_info(void)
	69	{
	70	struct thread_info *ti;
114f1329 PM	71	#if defined(CONFIG_SUPERH64)
	72	__asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti));
	73	#elif defined(CONFIG_CPU_HAS_SR_RB)
	74	__asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti));
f1517494 PM	75	#else
	76	unsigned long __dummy;
	77
	78	__asm__ __volatile__ (
	79	"mov r15, %0\n\t"
	80	"and %1, %0\n\t"
	81	: "=&r" (ti), "=r" (__dummy)
	82	: "1" (~(THREAD_SIZE - 1))
	83	: "memory");
	84	#endif
	85
1da177e4 LT	86	return ti;
	87	}
	88
c15c5f8c PM	89	/* thread information allocation */
	90	#if THREAD_SHIFT >= PAGE_SHIFT
	91
	92	#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
	93
	94	#else /* THREAD_SHIFT < PAGE_SHIFT */
	95
b69c49b7 FT	96	#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
b69c49b7 FT	97
c15c5f8c PM	98	extern struct thread_info alloc_thread_info(struct task_struct tsk);
	99	extern void free_thread_info(struct thread_info *ti);
	100
	101	#endif /* THREAD_SHIFT < PAGE_SHIFT */
1da177e4	102
510c72ad	103	#endif /* __ASSEMBLY__ */
1da177e4 LT	104
	105	/*
	106	* thread information flags
	107	* - these are process state flags that various assembly files may need to access
	108	* - pending work-to-be-done flags are in LSW
	109	* - other flags in MSW
	110	*/
	111	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	112	#define TIF_SIGPENDING 1 /* signal pending */
	113	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	114	#define TIF_RESTORE_SIGMASK 3 /* restore signal mask in do_signal() */
	115	#define TIF_SINGLESTEP 4 /* singlestepping active */
c4637d47 PM	116	#define TIF_SYSCALL_AUDIT 5 /* syscall auditing active */
c4637d47 PM	117	#define TIF_SECCOMP 6 /* secure computing */
ab99c733	118	#define TIF_NOTIFY_RESUME 7 /* callback before returning to user */
1da177e4 LT	119	#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
	120	#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
	121	#define TIF_MEMDIE 18
ab99c733	122	#define TIF_FREEZE 19 /* Freezing for suspend */
1da177e4	123
cec3fd3e PM	124	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
	125	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
	126	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
	127	#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
	128	#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
	129	#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
c4637d47	130	#define _TIF_SECCOMP (1 << TIF_SECCOMP)
ab99c733	131	#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
cec3fd3e PM	132	#define _TIF_USEDFPU (1 << TIF_USEDFPU)
	133	#define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
	134	#define _TIF_FREEZE (1 << TIF_FREEZE)
	135
	136	/*
	137	* _TIF_ALLWORK_MASK and _TIF_WORK_MASK need to fit within a byte, or we
	138	* blow the tst immediate size constraints and need to fix up
	139	* arch/sh/kernel/entry-common.S.
	140	*/
	141
	142	/* work to do in syscall trace */
	143	#define _TIF_WORK_SYSCALL_MASK (_TIF_SYSCALL_TRACE \| _TIF_SINGLESTEP \| \
c4637d47	144	_TIF_SYSCALL_AUDIT \| _TIF_SECCOMP)
cec3fd3e PM	145
cec3fd3e PM	146	/* work to do on any return to u-space */
ab99c733 PM	147	#define _TIF_ALLWORK_MASK (_TIF_SYSCALL_TRACE \| _TIF_SIGPENDING \| \
	148	_TIF_NEED_RESCHED \| _TIF_SYSCALL_AUDIT \| \
	149	_TIF_SINGLESTEP \| _TIF_RESTORE_SIGMASK \| \
	150	_TIF_NOTIFY_RESUME)
cec3fd3e PM	151
	152	/* work to do on interrupt/exception return */
	153	#define _TIF_WORK_MASK (_TIF_ALLWORK_MASK & ~(_TIF_SYSCALL_TRACE \| \
	154	_TIF_SYSCALL_AUDIT \| _TIF_SINGLESTEP))
1da177e4 LT	155
	156	#endif /* __KERNEL__ */
	157
	158	#endif /* __ASM_SH_THREAD_INFO_H */