[deliverable/linux.git] / include / asm-sh / 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__

#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;
	__u8			supervisor_stack[0];
};

#endif

#define PREEMPT_ACTIVE		0x10000000
#define THREAD_SIZE		(PAGE_SIZE * 2)
#define STACK_WARN		(THREAD_SIZE / 8)

/*
 * 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 thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
	struct thread_info *ti;
#ifdef CONFIG_CPU_HAS_SR_RB
	__asm__("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 */
#ifdef CONFIG_DEBUG_STACK_USAGE
#define alloc_thread_info(ti)	kzalloc(THREAD_SIZE, GFP_KERNEL)
#else
#define alloc_thread_info(ti)	kmalloc(THREAD_SIZE, GFP_KERNEL)
#endif
#define free_thread_info(ti)	kfree(ti)

#else /* !__ASSEMBLY__ */

/* how to get the thread information struct from ASM */
#define GET_THREAD_INFO(reg) \
	stc     r7_bank, reg

#endif

/*
 * 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_NOTIFY_RESUME	1	/* resumption notification requested */
#define TIF_SIGPENDING		2	/* signal pending */
#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
#define TIF_RESTORE_SIGMASK	4	/* restore signal mask in do_signal() */
#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_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME	(1<<TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
#define _TIF_USEDFPU		(1<<TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)

#define _TIF_WORK_MASK		0x000000FE	/* work to do on interrupt/exception return */
#define _TIF_ALLWORK_MASK	0x000000FF	/* work to do on any return to u-space */

#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	*/
	12
	13	#ifdef __KERNEL__
	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 LT	25	struct restart_block restart_block;
	26	__u8 supervisor_stack[0];
	27	};
	28
	29	#endif
	30
37053cc8	31	#define PREEMPT_ACTIVE 0x10000000
d153ea88 PM	32	#define THREAD_SIZE (PAGE_SIZE * 2)
d153ea88 PM	33	#define STACK_WARN (THREAD_SIZE / 8)
1da177e4 LT	34
	35	/*
	36	* macros/functions for gaining access to the thread information structure
	37	*/
	38	#ifndef __ASSEMBLY__
	39	#define INIT_THREAD_INFO(tsk) \
	40	{ \
	41	.task = &tsk, \
	42	.exec_domain = &default_exec_domain, \
	43	.flags = 0, \
	44	.cpu = 0, \
	45	.preempt_count = 1, \
2991be72	46	.addr_limit = KERNEL_DS, \
1da177e4 LT	47	.restart_block = { \
	48	.fn = do_no_restart_syscall, \
	49	}, \
	50	}
	51
	52	#define init_thread_info (init_thread_union.thread_info)
	53	#define init_stack (init_thread_union.stack)
	54
	55	/* how to get the thread information struct from C */
	56	static inline struct thread_info *current_thread_info(void)
	57	{
	58	struct thread_info *ti;
f1517494	59	#ifdef CONFIG_CPU_HAS_SR_RB
1da177e4	60	__asm__("stc r7_bank, %0" : "=r" (ti));
f1517494 PM	61	#else
	62	unsigned long __dummy;
	63
	64	__asm__ __volatile__ (
	65	"mov r15, %0\n\t"
	66	"and %1, %0\n\t"
	67	: "=&r" (ti), "=r" (__dummy)
	68	: "1" (~(THREAD_SIZE - 1))
	69	: "memory");
	70	#endif
	71
1da177e4 LT	72	return ti;
	73	}
	74
	75	/* thread information allocation */
d153ea88 PM	76	#ifdef CONFIG_DEBUG_STACK_USAGE
	77	#define alloc_thread_info(ti) kzalloc(THREAD_SIZE, GFP_KERNEL)
	78	#else
	79	#define alloc_thread_info(ti) kmalloc(THREAD_SIZE, GFP_KERNEL)
	80	#endif
	81	#define free_thread_info(ti) kfree(ti)
1da177e4 LT	82
	83	#else /* !__ASSEMBLY__ */
	84
	85	/* how to get the thread information struct from ASM */
	86	#define GET_THREAD_INFO(reg) \
f1517494	87	stc r7_bank, reg
1da177e4 LT	88
	89	#endif
	90
	91	/*
	92	* thread information flags
	93	* - these are process state flags that various assembly files may need to access
	94	* - pending work-to-be-done flags are in LSW
	95	* - other flags in MSW
	96	*/
	97	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
	98	#define TIF_NOTIFY_RESUME 1 /* resumption notification requested */
	99	#define TIF_SIGPENDING 2 /* signal pending */
	100	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
9f23e7e9	101	#define TIF_RESTORE_SIGMASK 4 /* restore signal mask in do_signal() */
1da177e4 LT	102	#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
	103	#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
	104	#define TIF_MEMDIE 18
1da177e4 LT	105
	106	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
	107	#define _TIF_NOTIFY_RESUME (1<<TIF_NOTIFY_RESUME)
	108	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	109	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
9f23e7e9	110	#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
1da177e4 LT	111	#define _TIF_USEDFPU (1<<TIF_USEDFPU)
1da177e4 LT	112	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
1da177e4 LT	113
	114	#define _TIF_WORK_MASK 0x000000FE /* work to do on interrupt/exception return */
	115	#define _TIF_ALLWORK_MASK 0x000000FF /* work to do on any return to u-space */
	116
	117	#endif /* __KERNEL__ */
	118
	119	#endif /* __ASM_SH_THREAD_INFO_H */