[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__
#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_SIZE_ORDER	(0)
#elif defined(CONFIG_PAGE_SIZE_4KB)
#define THREAD_SIZE_ORDER	(1)
#elif defined(CONFIG_PAGE_SIZE_8KB)
#define THREAD_SIZE_ORDER	(1)
#elif defined(CONFIG_PAGE_SIZE_16KB)
#define THREAD_SIZE_ORDER	(0)
#elif defined(CONFIG_PAGE_SIZE_64KB)
#define THREAD_SIZE_ORDER	(0)
#else
#error "Unknown thread size"
#endif

#define THREAD_SIZE	(PAGE_SIZE << THREAD_SIZE_ORDER)
#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;
}

#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR

/* 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)

#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
#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

#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_USEDFPU		(1<<TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG	(1<<TIF_POLLING_NRFLAG)
#define _TIF_FREEZE		(1<<TIF_FREEZE)

#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	*/
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 PM	35	#if defined(CONFIG_4KSTACKS)
	36	#define THREAD_SIZE_ORDER (0)
	37	#elif defined(CONFIG_PAGE_SIZE_4KB)
	38	#define THREAD_SIZE_ORDER (1)
	39	#elif defined(CONFIG_PAGE_SIZE_8KB)
	40	#define THREAD_SIZE_ORDER (1)
66dfe181 PM	41	#elif defined(CONFIG_PAGE_SIZE_16KB)
66dfe181 PM	42	#define THREAD_SIZE_ORDER (0)
7a847f81 PM	43	#elif defined(CONFIG_PAGE_SIZE_64KB)
7a847f81 PM	44	#define THREAD_SIZE_ORDER (0)
a6a31139	45	#else
7a847f81	46	#error "Unknown thread size"
a6a31139	47	#endif
7a847f81 PM	48
	49	#define THREAD_SIZE (PAGE_SIZE << THREAD_SIZE_ORDER)
	50	#define STACK_WARN (THREAD_SIZE >> 3)
1da177e4 LT	51
	52	/*
	53	* macros/functions for gaining access to the thread information structure
	54	*/
	55	#ifndef __ASSEMBLY__
	56	#define INIT_THREAD_INFO(tsk) \
	57	{ \
	58	.task = &tsk, \
	59	.exec_domain = &default_exec_domain, \
	60	.flags = 0, \
	61	.cpu = 0, \
	62	.preempt_count = 1, \
2991be72	63	.addr_limit = KERNEL_DS, \
1da177e4 LT	64	.restart_block = { \
	65	.fn = do_no_restart_syscall, \
	66	}, \
	67	}
	68
	69	#define init_thread_info (init_thread_union.thread_info)
	70	#define init_stack (init_thread_union.stack)
	71
a6a31139	72	/* how to get the current stack pointer from C */
3ff6eecc	73	register unsigned long current_stack_pointer asm("r15") __used;
a6a31139	74
1da177e4 LT	75	/* how to get the thread information struct from C */
	76	static inline struct thread_info *current_thread_info(void)
	77	{
	78	struct thread_info *ti;
114f1329 PM	79	#if defined(CONFIG_SUPERH64)
	80	__asm__ __volatile__ ("getcon cr17, %0" : "=r" (ti));
	81	#elif defined(CONFIG_CPU_HAS_SR_RB)
	82	__asm__ __volatile__ ("stc r7_bank, %0" : "=r" (ti));
f1517494 PM	83	#else
	84	unsigned long __dummy;
	85
	86	__asm__ __volatile__ (
	87	"mov r15, %0\n\t"
	88	"and %1, %0\n\t"
	89	: "=&r" (ti), "=r" (__dummy)
	90	: "1" (~(THREAD_SIZE - 1))
	91	: "memory");
	92	#endif
	93
1da177e4 LT	94	return ti;
	95	}
	96
b69c49b7 FT	97	#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
b69c49b7 FT	98
1da177e4	99	/* thread information allocation */
d153ea88 PM	100	#ifdef CONFIG_DEBUG_STACK_USAGE
	101	#define alloc_thread_info(ti) kzalloc(THREAD_SIZE, GFP_KERNEL)
	102	#else
	103	#define alloc_thread_info(ti) kmalloc(THREAD_SIZE, GFP_KERNEL)
	104	#endif
	105	#define free_thread_info(ti) kfree(ti)
1da177e4	106
510c72ad	107	#endif /* __ASSEMBLY__ */
1da177e4 LT	108
	109	/*
	110	* thread information flags
	111	* - these are process state flags that various assembly files may need to access
	112	* - pending work-to-be-done flags are in LSW
	113	* - other flags in MSW
	114	*/
	115	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	116	#define TIF_SIGPENDING 1 /* signal pending */
	117	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
	118	#define TIF_RESTORE_SIGMASK 3 /* restore signal mask in do_signal() */
	119	#define TIF_SINGLESTEP 4 /* singlestepping active */
1322b9de	120	#define TIF_SYSCALL_AUDIT 5
1da177e4 LT	121	#define TIF_USEDFPU 16 /* FPU was used by this task this quantum (SMP) */
	122	#define TIF_POLLING_NRFLAG 17 /* true if poll_idle() is polling TIF_NEED_RESCHED */
	123	#define TIF_MEMDIE 18
8a102eed	124	#define TIF_FREEZE 19
1da177e4 LT	125
1da177e4 LT	126	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
1da177e4 LT	127	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
1da177e4 LT	128	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
9f23e7e9	129	#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
9432f968	130	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
1322b9de	131	#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
1da177e4 LT	132	#define _TIF_USEDFPU (1<<TIF_USEDFPU)
1da177e4 LT	133	#define _TIF_POLLING_NRFLAG (1<<TIF_POLLING_NRFLAG)
8a102eed	134	#define _TIF_FREEZE (1<<TIF_FREEZE)
1da177e4 LT	135
	136	#define _TIF_WORK_MASK 0x000000FE /* work to do on interrupt/exception return */
	137	#define _TIF_ALLWORK_MASK 0x000000FF /* work to do on any return to u-space */
	138
	139	#endif /* __KERNEL__ */
	140
	141	#endif /* __ASM_SH_THREAD_INFO_H */