[net-next-2.6.git] / include / asm-x86 / thread_info_32.h

/* thread_info.h: i386 low-level thread information
 *
 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#ifdef __KERNEL__

#include <linux/compiler.h>
#include <asm/page.h>

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

/*
 * low level task data that entry.S needs immediate access to
 * - this struct should fit entirely inside of one cache line
 * - this struct shares the supervisor stack pages
 * - if the contents of this structure are changed,
 *   the assembly constants must also be changed
 */
#ifndef __ASSEMBLY__

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			cpu;		/* current CPU */
	int			preempt_count;	/* 0 => preemptable,
						   <0 => BUG */
	mm_segment_t		addr_limit;	/* thread address space:
						   0-0xBFFFFFFF user-thread
						   0-0xFFFFFFFF kernel-thread
						*/
	void			*sysenter_return;
	struct restart_block    restart_block;
	unsigned long           previous_esp;   /* ESP of the previous stack in
						   case of nested (IRQ) stacks
						*/
	__u8			supervisor_stack[0];
};

#else /* !__ASSEMBLY__ */

#include <asm/asm-offsets.h>

#endif

#define PREEMPT_ACTIVE		0x10000000
#ifdef CONFIG_4KSTACKS
#define THREAD_SIZE            (4096)
#else
#define THREAD_SIZE		(8192)
#endif

#define STACK_WARN             (THREAD_SIZE/8)
/*
 * macros/functions for gaining access to the thread information structure
 *
 * preempt_count needs to be 1 initially, until the scheduler is functional.
 */
#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("esp") __used;

/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
	return (struct thread_info *)
		(current_stack_pointer & ~(THREAD_SIZE - 1));
}

/* thread information allocation */
#ifdef CONFIG_DEBUG_STACK_USAGE
#define alloc_thread_info(tsk) ((struct thread_info *)			\
	__get_free_pages(GFP_KERNEL | __GFP_ZERO, get_order(THREAD_SIZE)))
#else
#define alloc_thread_info(tsk) ((struct thread_info *)			\
	__get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE)))
#endif

#else /* !__ASSEMBLY__ */

/* how to get the thread information struct from ASM */
#define GET_THREAD_INFO(reg)	 \
	movl $-THREAD_SIZE, reg; \
	andl %esp, reg

/* use this one if reg already contains %esp */
#define GET_THREAD_INFO_WITH_ESP(reg) \
	andl $-THREAD_SIZE, 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_SIGPENDING		1	/* signal pending */
#define TIF_NEED_RESCHED	2	/* rescheduling necessary */
#define TIF_SINGLESTEP		3	/* restore singlestep on return to
					   user mode */
#define TIF_IRET		4	/* return with iret */
#define TIF_SYSCALL_EMU		5	/* syscall emulation active */
#define TIF_SYSCALL_AUDIT	6	/* syscall auditing active */
#define TIF_SECCOMP		7	/* secure computing */
#define TIF_RESTORE_SIGMASK	8	/* restore signal mask in do_signal() */
#define TIF_HRTICK_RESCHED	9	/* reprogram hrtick timer */
#define TIF_MEMDIE		16
#define TIF_DEBUG		17	/* uses debug registers */
#define TIF_IO_BITMAP		18	/* uses I/O bitmap */
#define TIF_FREEZE		19	/* is freezing for suspend */
#define TIF_NOTSC		20	/* TSC is not accessible in userland */
#define TIF_FORCED_TF		21	/* true if TF in eflags artificially */
#define TIF_DEBUGCTLMSR		22	/* uses thread_struct.debugctlmsr */
#define TIF_DS_AREA_MSR 	23      /* uses thread_struct.ds_area_msr */
#define TIF_BTS_TRACE_TS        24      /* record scheduling event timestamps */

#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
#define _TIF_IRET		(1 << TIF_IRET)
#define _TIF_SYSCALL_EMU	(1 << TIF_SYSCALL_EMU)
#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
#define _TIF_RESTORE_SIGMASK	(1 << TIF_RESTORE_SIGMASK)
#define _TIF_HRTICK_RESCHED	(1 << TIF_HRTICK_RESCHED)
#define _TIF_DEBUG		(1 << TIF_DEBUG)
#define _TIF_IO_BITMAP		(1 << TIF_IO_BITMAP)
#define _TIF_FREEZE		(1 << TIF_FREEZE)
#define _TIF_NOTSC		(1 << TIF_NOTSC)
#define _TIF_FORCED_TF		(1 << TIF_FORCED_TF)
#define _TIF_DEBUGCTLMSR	(1 << TIF_DEBUGCTLMSR)
#define _TIF_DS_AREA_MSR	(1 << TIF_DS_AREA_MSR)
#define _TIF_BTS_TRACE_TS	(1 << TIF_BTS_TRACE_TS)

/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK							\
	(0x0000FFFF & ~(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT |	\
			_TIF_SECCOMP | _TIF_SYSCALL_EMU))
/* work to do on any return to u-space */
#define _TIF_ALLWORK_MASK	(0x0000FFFF & ~_TIF_SECCOMP)

/* flags to check in __switch_to() */
#define _TIF_WORK_CTXSW						\
	(_TIF_IO_BITMAP | _TIF_NOTSC | _TIF_DEBUGCTLMSR |	\
	 _TIF_DS_AREA_MSR | _TIF_BTS_TRACE_TS)
#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW | _TIF_DEBUG)


/*
 * 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.
 */
#define TS_USEDFPU		0x0001	/* FPU was used by this task
					   this quantum (SMP) */
#define TS_POLLING		0x0002	/* True if in idle loop
					   and not sleeping */

#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)

#endif /* __KERNEL__ */

#endif /* _ASM_THREAD_INFO_H */
Commit	Line	Data
1da177e4 LT	1	/* thread_info.h: i386 low-level thread information
	2	*
	3	* Copyright (C) 2002 David Howells (dhowells@redhat.com)
	4	* - Incorporating suggestions made by Linus Torvalds and Dave Miller
	5	*/
	6
	7	#ifndef _ASM_THREAD_INFO_H
	8	#define _ASM_THREAD_INFO_H
	9
	10	#ifdef __KERNEL__
	11
1da177e4 LT	12	#include <linux/compiler.h>
	13	#include <asm/page.h>
	14
	15	#ifndef __ASSEMBLY__
	16	#include <asm/processor.h>
	17	#endif
	18
	19	/*
	20	* low level task data that entry.S needs immediate access to
	21	* - this struct should fit entirely inside of one cache line
	22	* - this struct shares the supervisor stack pages
89917f28 JP	23	* - if the contents of this structure are changed,
89917f28 JP	24	* the assembly constants must also be changed
1da177e4 LT	25	*/
	26	#ifndef __ASSEMBLY__
	27
	28	struct thread_info {
	29	struct task_struct task; / main task structure */
	30	struct exec_domain exec_domain; / execution domain */
	31	unsigned long flags; /* low level flags */
	32	unsigned long status; /* thread-synchronous flags */
	33	__u32 cpu; /* current CPU */
89917f28 JP	34	int preempt_count; /* 0 => preemptable,
89917f28 JP	35	<0 => BUG */
1da177e4	36	mm_segment_t addr_limit; /* thread address space:
89917f28 JP	37	0-0xBFFFFFFF user-thread
89917f28 JP	38	0-0xFFFFFFFF kernel-thread
1da177e4	39	*/
e6e5494c	40	void *sysenter_return;
1da177e4	41	struct restart_block restart_block;
89917f28 JP	42	unsigned long previous_esp; /* ESP of the previous stack in
89917f28 JP	43	case of nested (IRQ) stacks
1da177e4 LT	44	*/
	45	__u8 supervisor_stack[0];
	46	};
	47
	48	#else /* !__ASSEMBLY__ */
	49
86feeaa8	50	#include <asm/asm-offsets.h>
1da177e4 LT	51
	52	#endif
	53
	54	#define PREEMPT_ACTIVE 0x10000000
	55	#ifdef CONFIG_4KSTACKS
	56	#define THREAD_SIZE (4096)
	57	#else
	58	#define THREAD_SIZE (8192)
	59	#endif
	60
	61	#define STACK_WARN (THREAD_SIZE/8)
	62	/*
	63	* macros/functions for gaining access to the thread information structure
	64	*
	65	* preempt_count needs to be 1 initially, until the scheduler is functional.
	66	*/
	67	#ifndef __ASSEMBLY__
	68
	69	#define INIT_THREAD_INFO(tsk) \
	70	{ \
	71	.task = &tsk, \
	72	.exec_domain = &default_exec_domain, \
	73	.flags = 0, \
	74	.cpu = 0, \
	75	.preempt_count = 1, \
	76	.addr_limit = KERNEL_DS, \
	77	.restart_block = { \
	78	.fn = do_no_restart_syscall, \
	79	}, \
	80	}
	81
	82	#define init_thread_info (init_thread_union.thread_info)
	83	#define init_stack (init_thread_union.stack)
	84
	85
c723e084	86	/* how to get the current stack pointer from C */
3ff6eecc	87	register unsigned long current_stack_pointer asm("esp") __used;
c723e084	88
1da177e4 LT	89	/* how to get the thread information struct from C */
	90	static inline struct thread_info *current_thread_info(void)
	91	{
89917f28 JP	92	return (struct thread_info *)
89917f28 JP	93	(current_stack_pointer & ~(THREAD_SIZE - 1));
1da177e4 LT	94	}
1da177e4 LT	95
1da177e4 LT	96	/* thread information allocation */
1da177e4 LT	97	#ifdef CONFIG_DEBUG_STACK_USAGE
89917f28 JP	98	#define alloc_thread_info(tsk) ((struct thread_info *) \
89917f28 JP	99	__get_free_pages(GFP_KERNEL \| __GFP_ZERO, get_order(THREAD_SIZE)))
1da177e4	100	#else
89917f28	101	#define alloc_thread_info(tsk) ((struct thread_info *) \
b5637e65	102	__get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE)))
1da177e4 LT	103	#endif
1da177e4 LT	104
1da177e4 LT	105	#else /* !__ASSEMBLY__ */
	106
	107	/* how to get the thread information struct from ASM */
89917f28	108	#define GET_THREAD_INFO(reg) \
1da177e4 LT	109	movl $-THREAD_SIZE, reg; \
	110	andl %esp, reg
	111
	112	/* use this one if reg already contains %esp */
	113	#define GET_THREAD_INFO_WITH_ESP(reg) \
	114	andl $-THREAD_SIZE, reg
	115
	116	#endif
	117
	118	/*
	119	* thread information flags
89917f28 JP	120	* - these are process state flags that various
89917f28 JP	121	* assembly files may need to access
1da177e4 LT	122	* - pending work-to-be-done flags are in LSW
	123	* - other flags in MSW
	124	*/
	125	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
a583f1b5 SE	126	#define TIF_SIGPENDING 1 /* signal pending */
a583f1b5 SE	127	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
89917f28 JP	128	#define TIF_SINGLESTEP 3 /* restore singlestep on return to
89917f28 JP	129	user mode */
a583f1b5 SE	130	#define TIF_IRET 4 /* return with iret */
	131	#define TIF_SYSCALL_EMU 5 /* syscall emulation active */
	132	#define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */
	133	#define TIF_SECCOMP 7 /* secure computing */
1c7d06d4	134	#define TIF_RESTORE_SIGMASK 8 /* restore signal mask in do_signal() */
8f4d37ec	135	#define TIF_HRTICK_RESCHED 9 /* reprogram hrtick timer */
495ab9c0	136	#define TIF_MEMDIE 16
b3cf2576 SE	137	#define TIF_DEBUG 17 /* uses debug registers */
b3cf2576 SE	138	#define TIF_IO_BITMAP 18 /* uses I/O bitmap */
8a102eed	139	#define TIF_FREEZE 19 /* is freezing for suspend */
cf99abac	140	#define TIF_NOTSC 20 /* TSC is not accessible in userland */
e1f28773	141	#define TIF_FORCED_TF 21 /* true if TF in eflags artificially */
7e991604	142	#define TIF_DEBUGCTLMSR 22 /* uses thread_struct.debugctlmsr */
eee3af4a MM	143	#define TIF_DS_AREA_MSR 23 /* uses thread_struct.ds_area_msr */
eee3af4a MM	144	#define TIF_BTS_TRACE_TS 24 /* record scheduling event timestamps */
1da177e4	145
89917f28 JP	146	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
	147	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
	148	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
	149	#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
	150	#define _TIF_IRET (1 << TIF_IRET)
	151	#define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU)
	152	#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
	153	#define _TIF_SECCOMP (1 << TIF_SECCOMP)
1c7d06d4	154	#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
89917f28 JP	155	#define _TIF_HRTICK_RESCHED (1 << TIF_HRTICK_RESCHED)
	156	#define _TIF_DEBUG (1 << TIF_DEBUG)
	157	#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP)
	158	#define _TIF_FREEZE (1 << TIF_FREEZE)
	159	#define _TIF_NOTSC (1 << TIF_NOTSC)
	160	#define _TIF_FORCED_TF (1 << TIF_FORCED_TF)
	161	#define _TIF_DEBUGCTLMSR (1 << TIF_DEBUGCTLMSR)
	162	#define _TIF_DS_AREA_MSR (1 << TIF_DS_AREA_MSR)
	163	#define _TIF_BTS_TRACE_TS (1 << TIF_BTS_TRACE_TS)
1da177e4 LT	164
1da177e4 LT	165	/* work to do on interrupt/exception return */
89917f28 JP	166	#define _TIF_WORK_MASK \
	167	(0x0000FFFF & ~(_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_AUDIT \| \
	168	_TIF_SECCOMP \| _TIF_SYSCALL_EMU))
1da177e4 LT	169	/* work to do on any return to u-space */
	170	#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
	171
b3cf2576	172	/* flags to check in __switch_to() */
89917f28 JP	173	#define _TIF_WORK_CTXSW \
	174	(_TIF_IO_BITMAP \| _TIF_NOTSC \| _TIF_DEBUGCTLMSR \| \
	175	_TIF_DS_AREA_MSR \| _TIF_BTS_TRACE_TS)
eee3af4a MM	176	#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
	177	#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW \| _TIF_DEBUG)
	178
b3cf2576	179
1da177e4 LT	180	/*
	181	* Thread-synchronous status.
	182	*
	183	* This is different from the flags in that nobody else
	184	* ever touches our thread-synchronous status, so we don't
	185	* have to worry about atomic accesses.
	186	*/
89917f28 JP	187	#define TS_USEDFPU 0x0001 /* FPU was used by this task
	188	this quantum (SMP) */
	189	#define TS_POLLING 0x0002 /* True if in idle loop
	190	and not sleeping */
495ab9c0	191
c9f4f06d	192	#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
1da177e4 LT	193
	194	#endif /* __KERNEL__ */
	195
	196	#endif /* _ASM_THREAD_INFO_H */