[net-next-2.6.git] / include / asm-x86_64 / thread_info.h

/* thread_info.h: x86_64 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 <asm/page.h>
#include <asm/types.h>
#include <asm/pda.h>

/*
 * 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
 */
#ifndef __ASSEMBLY__
struct task_struct;
struct exec_domain;
#include <asm/mmsegment.h>

struct thread_info {
	struct task_struct	*task;		/* main task structure */
	struct exec_domain	*exec_domain;	/* execution domain */
	__u32			flags;		/* low level flags */
	__u32			status;		/* thread synchronous flags */
	__u32			cpu;		/* current CPU */
	int 			preempt_count;	/* 0 => preemptable, <0 => BUG */

	mm_segment_t		addr_limit;	
	struct restart_block    restart_block;
};
#endif

/*
 * 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)

static inline struct thread_info *current_thread_info(void)
{ 
	struct thread_info *ti;
	ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE);
	return ti; 
}

/* do not use in interrupt context */
static inline struct thread_info *stack_thread_info(void)
{
	struct thread_info *ti;
	__asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (~(THREAD_SIZE - 1)));
	return ti;
}

/* thread information allocation */
#ifdef CONFIG_DEBUG_STACK_USAGE
#define alloc_thread_info(tsk)					\
    ({								\
	struct thread_info *ret;				\
								\
	ret = ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER)); \
	if (ret)						\
		memset(ret, 0, THREAD_SIZE);			\
	ret;							\
    })
#else
#define alloc_thread_info(tsk) \
	((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER))
#endif

#define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER)

#else /* !__ASSEMBLY__ */

/* how to get the thread information struct from ASM */
#define GET_THREAD_INFO(reg) \
	movq %gs:pda_kernelstack,reg ; \
	subq $(THREAD_SIZE-PDA_STACKOFFSET),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
 * Warning: layout of LSW is hardcoded in entry.S
 */
#define TIF_SYSCALL_TRACE	0	/* syscall trace active */
#define TIF_SIGPENDING		2	/* signal pending */
#define TIF_NEED_RESCHED	3	/* rescheduling necessary */
#define TIF_SINGLESTEP		4	/* reenable singlestep on user return*/
#define TIF_IRET		5	/* force IRET */
#define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */
#define TIF_SECCOMP		8	/* secure computing */
#define TIF_RESTORE_SIGMASK	9	/* restore signal mask in do_signal */
#define TIF_MCE_NOTIFY		10	/* notify userspace of an MCE */
/* 16 free */
#define TIF_IA32		17	/* 32bit process */ 
#define TIF_FORK		18	/* ret_from_fork */
#define TIF_ABI_PENDING		19
#define TIF_MEMDIE		20
#define TIF_DEBUG		21	/* uses debug registers */
#define TIF_IO_BITMAP		22	/* uses I/O bitmap */
#define TIF_FREEZE		23	/* is freezing for suspend */

#define _TIF_SYSCALL_TRACE	(1<<TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING		(1<<TIF_SIGPENDING)
#define _TIF_SINGLESTEP		(1<<TIF_SINGLESTEP)
#define _TIF_NEED_RESCHED	(1<<TIF_NEED_RESCHED)
#define _TIF_IRET		(1<<TIF_IRET)
#define _TIF_SYSCALL_AUDIT	(1<<TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP		(1<<TIF_SECCOMP)
#define _TIF_RESTORE_SIGMASK	(1<<TIF_RESTORE_SIGMASK)
#define _TIF_MCE_NOTIFY		(1<<TIF_MCE_NOTIFY)
#define _TIF_IA32		(1<<TIF_IA32)
#define _TIF_FORK		(1<<TIF_FORK)
#define _TIF_ABI_PENDING	(1<<TIF_ABI_PENDING)
#define _TIF_DEBUG		(1<<TIF_DEBUG)
#define _TIF_IO_BITMAP		(1<<TIF_IO_BITMAP)
#define _TIF_FREEZE		(1<<TIF_FREEZE)

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

/* flags to check in __switch_to() */
#define _TIF_WORK_CTXSW (_TIF_DEBUG|_TIF_IO_BITMAP)

#define PREEMPT_ACTIVE     0x10000000

/*
 * 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_COMPAT		0x0002	/* 32bit syscall active */
#define TS_POLLING		0x0004	/* 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: x86_64 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
	12	#include <asm/page.h>
	13	#include <asm/types.h>
	14	#include <asm/pda.h>
	15
	16	/*
	17	* low level task data that entry.S needs immediate access to
	18	* - this struct should fit entirely inside of one cache line
	19	* - this struct shares the supervisor stack pages
	20	*/
	21	#ifndef __ASSEMBLY__
	22	struct task_struct;
	23	struct exec_domain;
	24	#include <asm/mmsegment.h>
	25
	26	struct thread_info {
	27	struct task_struct task; / main task structure */
	28	struct exec_domain exec_domain; / execution domain */
	29	__u32 flags; /* low level flags */
	30	__u32 status; /* thread synchronous flags */
	31	__u32 cpu; /* current CPU */
dcd497f9	32	int preempt_count; /* 0 => preemptable, <0 => BUG */
1da177e4 LT	33
	34	mm_segment_t addr_limit;
	35	struct restart_block restart_block;
	36	};
	37	#endif
	38
	39	/*
	40	* macros/functions for gaining access to the thread information structure
	41	* preempt_count needs to be 1 initially, until the scheduler is functional.
	42	*/
	43	#ifndef __ASSEMBLY__
	44	#define INIT_THREAD_INFO(tsk) \
	45	{ \
	46	.task = &tsk, \
	47	.exec_domain = &default_exec_domain, \
	48	.flags = 0, \
	49	.cpu = 0, \
	50	.preempt_count = 1, \
	51	.addr_limit = KERNEL_DS, \
	52	.restart_block = { \
	53	.fn = do_no_restart_syscall, \
	54	}, \
	55	}
	56
	57	#define init_thread_info (init_thread_union.thread_info)
	58	#define init_stack (init_thread_union.stack)
	59
	60	static inline struct thread_info *current_thread_info(void)
	61	{
	62	struct thread_info *ti;
	63	ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE);
	64	return ti;
	65	}
	66
	67	/* do not use in interrupt context */
	68	static inline struct thread_info *stack_thread_info(void)
	69	{
	70	struct thread_info *ti;
	71	__asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (~(THREAD_SIZE - 1)));
	72	return ti;
	73	}
	74
	75	/* thread information allocation */
8501a2fb ES	76	#ifdef CONFIG_DEBUG_STACK_USAGE
	77	#define alloc_thread_info(tsk) \
	78	({ \
	79	struct thread_info *ret; \
	80	\
	81	ret = ((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER)); \
	82	if (ret) \
	83	memset(ret, 0, THREAD_SIZE); \
	84	ret; \
	85	})
	86	#else
1da177e4 LT	87	#define alloc_thread_info(tsk) \
1da177e4 LT	88	((struct thread_info *) __get_free_pages(GFP_KERNEL,THREAD_ORDER))
8501a2fb ES	89	#endif
8501a2fb ES	90
1da177e4	91	#define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER)
1da177e4 LT	92
	93	#else /* !__ASSEMBLY__ */
	94
	95	/* how to get the thread information struct from ASM */
	96	#define GET_THREAD_INFO(reg) \
	97	movq %gs:pda_kernelstack,reg ; \
	98	subq $(THREAD_SIZE-PDA_STACKOFFSET),reg
	99
	100	#endif
	101
	102	/*
	103	* thread information flags
	104	* - these are process state flags that various assembly files may need to access
	105	* - pending work-to-be-done flags are in LSW
	106	* - other flags in MSW
	107	* Warning: layout of LSW is hardcoded in entry.S
	108	*/
	109	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
1da177e4 LT	110	#define TIF_SIGPENDING 2 /* signal pending */
	111	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
	112	#define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/
	113	#define TIF_IRET 5 /* force IRET */
	114	#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
	115	#define TIF_SECCOMP 8 /* secure computing */
1d001df1	116	#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */
e02e68d3	117	#define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */
495ab9c0	118	/* 16 free */
1da177e4 LT	119	#define TIF_IA32 17 /* 32bit process */
	120	#define TIF_FORK 18 /* ret_from_fork */
	121	#define TIF_ABI_PENDING 19
	122	#define TIF_MEMDIE 20
d3a4f48d SE	123	#define TIF_DEBUG 21 /* uses debug registers */
d3a4f48d SE	124	#define TIF_IO_BITMAP 22 /* uses I/O bitmap */
8a102eed	125	#define TIF_FREEZE 23 /* is freezing for suspend */
1da177e4 LT	126
1da177e4 LT	127	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
1da177e4 LT	128	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	129	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
	130	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	131	#define _TIF_IRET (1<<TIF_IRET)
	132	#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
	133	#define _TIF_SECCOMP (1<<TIF_SECCOMP)
1d001df1	134	#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
e02e68d3	135	#define _TIF_MCE_NOTIFY (1<<TIF_MCE_NOTIFY)
1da177e4 LT	136	#define _TIF_IA32 (1<<TIF_IA32)
	137	#define _TIF_FORK (1<<TIF_FORK)
	138	#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
d3a4f48d SE	139	#define _TIF_DEBUG (1<<TIF_DEBUG)
d3a4f48d SE	140	#define _TIF_IO_BITMAP (1<<TIF_IO_BITMAP)
8a102eed	141	#define _TIF_FREEZE (1<<TIF_FREEZE)
1da177e4 LT	142
	143	/* work to do on interrupt/exception return */
	144	#define _TIF_WORK_MASK \
	145	(0x0000FFFF & ~(_TIF_SYSCALL_TRACE\|_TIF_SYSCALL_AUDIT\|_TIF_SINGLESTEP\|_TIF_SECCOMP))
	146	/* work to do on any return to user space */
	147	#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
	148
d3a4f48d SE	149	/* flags to check in __switch_to() */
	150	#define _TIF_WORK_CTXSW (_TIF_DEBUG\|_TIF_IO_BITMAP)
	151
1da177e4 LT	152	#define PREEMPT_ACTIVE 0x10000000
	153
	154	/*
	155	* Thread-synchronous status.
	156	*
	157	* This is different from the flags in that nobody else
	158	* ever touches our thread-synchronous status, so we don't
	159	* have to worry about atomic accesses.
	160	*/
	161	#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
bf2fcc6f	162	#define TS_COMPAT 0x0002 /* 32bit syscall active */
495ab9c0 AK	163	#define TS_POLLING 0x0004 /* true if in idle loop and not sleeping */
495ab9c0 AK	164
c9f4f06d	165	#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
1da177e4 LT	166
	167	#endif /* __KERNEL__ */
	168
	169	#endif /* _ASM_THREAD_INFO_H */