[linux-2.6-block.git] / include / asm-x86 / thread_info_64.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/processor.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;
#ifdef CONFIG_IA32_EMULATION
	void __user		*sysenter_return;
#endif
};
#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 THREAD_FLAGS (GFP_KERNEL | __GFP_ZERO)
#else
#define THREAD_FLAGS GFP_KERNEL
#endif

#define alloc_thread_info(tsk) \
	((struct thread_info *) __get_free_pages(THREAD_FLAGS, THREAD_ORDER))

#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 */
#define TIF_HRTICK_RESCHED	11	/* reprogram hrtick timer */
/* 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_FORCED_TF		24	/* true if TF in eflags artificially */
#define TIF_DEBUGCTLMSR		25	/* uses thread_struct.debugctlmsr */
#define TIF_DS_AREA_MSR		26      /* uses thread_struct.ds_area_msr */
#define TIF_BTS_TRACE_TS	27      /* record scheduling event timestamps */

#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_HRTICK_RESCHED	(1<<TIF_HRTICK_RESCHED)
#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)
#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_SINGLESTEP|_TIF_SECCOMP))
/* work to do on any return to user space */
#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)

#define _TIF_DO_NOTIFY_MASK \
	(_TIF_SIGPENDING|_TIF_SINGLESTEP|_TIF_MCE_NOTIFY|_TIF_HRTICK_RESCHED)

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

#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;
fc87e906	24	#include <asm/processor.h>
1da177e4 LT	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;
36197c92 RM	36	#ifdef CONFIG_IA32_EMULATION
	37	void __user *sysenter_return;
	38	#endif
1da177e4 LT	39	};
	40	#endif
	41
	42	/*
	43	* macros/functions for gaining access to the thread information structure
	44	* preempt_count needs to be 1 initially, until the scheduler is functional.
	45	*/
	46	#ifndef __ASSEMBLY__
	47	#define INIT_THREAD_INFO(tsk) \
	48	{ \
	49	.task = &tsk, \
	50	.exec_domain = &default_exec_domain, \
	51	.flags = 0, \
	52	.cpu = 0, \
	53	.preempt_count = 1, \
	54	.addr_limit = KERNEL_DS, \
	55	.restart_block = { \
	56	.fn = do_no_restart_syscall, \
	57	}, \
	58	}
	59
	60	#define init_thread_info (init_thread_union.thread_info)
	61	#define init_stack (init_thread_union.stack)
	62
	63	static inline struct thread_info *current_thread_info(void)
	64	{
	65	struct thread_info *ti;
	66	ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE);
	67	return ti;
	68	}
	69
	70	/* do not use in interrupt context */
	71	static inline struct thread_info *stack_thread_info(void)
	72	{
	73	struct thread_info *ti;
	74	__asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (~(THREAD_SIZE - 1)));
	75	return ti;
	76	}
	77
	78	/* thread information allocation */
8501a2fb	79	#ifdef CONFIG_DEBUG_STACK_USAGE
6ea8bad1	80	#define THREAD_FLAGS (GFP_KERNEL \| __GFP_ZERO)
8501a2fb	81	#else
6ea8bad1	82	#define THREAD_FLAGS GFP_KERNEL
8501a2fb	83	#endif
6ea8bad1	84
	85	#define alloc_thread_info(tsk) \
	86	((struct thread_info *) __get_free_pages(THREAD_FLAGS, THREAD_ORDER))
8501a2fb	87
1da177e4	88	#define free_thread_info(ti) free_pages((unsigned long) (ti), THREAD_ORDER)
1da177e4 LT	89
	90	#else /* !__ASSEMBLY__ */
	91
	92	/* how to get the thread information struct from ASM */
	93	#define GET_THREAD_INFO(reg) \
	94	movq %gs:pda_kernelstack,reg ; \
	95	subq $(THREAD_SIZE-PDA_STACKOFFSET),reg
	96
	97	#endif
	98
	99	/*
	100	* thread information flags
	101	* - these are process state flags that various assembly files may need to access
	102	* - pending work-to-be-done flags are in LSW
	103	* - other flags in MSW
	104	* Warning: layout of LSW is hardcoded in entry.S
	105	*/
	106	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
1da177e4 LT	107	#define TIF_SIGPENDING 2 /* signal pending */
	108	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
	109	#define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/
	110	#define TIF_IRET 5 /* force IRET */
	111	#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
	112	#define TIF_SECCOMP 8 /* secure computing */
1d001df1	113	#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */
e02e68d3	114	#define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */
8f4d37ec	115	#define TIF_HRTICK_RESCHED 11 /* reprogram hrtick timer */
495ab9c0	116	/* 16 free */
1da177e4 LT	117	#define TIF_IA32 17 /* 32bit process */
	118	#define TIF_FORK 18 /* ret_from_fork */
	119	#define TIF_ABI_PENDING 19
	120	#define TIF_MEMDIE 20
d3a4f48d SE	121	#define TIF_DEBUG 21 /* uses debug registers */
d3a4f48d SE	122	#define TIF_IO_BITMAP 22 /* uses I/O bitmap */
8a102eed	123	#define TIF_FREEZE 23 /* is freezing for suspend */
e1f28773	124	#define TIF_FORCED_TF 24 /* true if TF in eflags artificially */
7e991604	125	#define TIF_DEBUGCTLMSR 25 /* uses thread_struct.debugctlmsr */
4bc408a5 MD	126	#define TIF_DS_AREA_MSR 26 /* uses thread_struct.ds_area_msr */
4bc408a5 MD	127	#define TIF_BTS_TRACE_TS 27 /* record scheduling event timestamps */
1da177e4 LT	128
1da177e4 LT	129	#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
1da177e4 LT	130	#define _TIF_SIGPENDING (1<<TIF_SIGPENDING)
	131	#define _TIF_SINGLESTEP (1<<TIF_SINGLESTEP)
	132	#define _TIF_NEED_RESCHED (1<<TIF_NEED_RESCHED)
	133	#define _TIF_IRET (1<<TIF_IRET)
	134	#define _TIF_SYSCALL_AUDIT (1<<TIF_SYSCALL_AUDIT)
	135	#define _TIF_SECCOMP (1<<TIF_SECCOMP)
1d001df1	136	#define _TIF_RESTORE_SIGMASK (1<<TIF_RESTORE_SIGMASK)
e02e68d3	137	#define _TIF_MCE_NOTIFY (1<<TIF_MCE_NOTIFY)
8f4d37ec	138	#define _TIF_HRTICK_RESCHED (1<<TIF_HRTICK_RESCHED)
1da177e4 LT	139	#define _TIF_IA32 (1<<TIF_IA32)
	140	#define _TIF_FORK (1<<TIF_FORK)
	141	#define _TIF_ABI_PENDING (1<<TIF_ABI_PENDING)
d3a4f48d SE	142	#define _TIF_DEBUG (1<<TIF_DEBUG)
d3a4f48d SE	143	#define _TIF_IO_BITMAP (1<<TIF_IO_BITMAP)
8a102eed	144	#define _TIF_FREEZE (1<<TIF_FREEZE)
e1f28773	145	#define _TIF_FORCED_TF (1<<TIF_FORCED_TF)
7e991604	146	#define _TIF_DEBUGCTLMSR (1<<TIF_DEBUGCTLMSR)
eee3af4a MM	147	#define _TIF_DS_AREA_MSR (1<<TIF_DS_AREA_MSR)
eee3af4a MM	148	#define _TIF_BTS_TRACE_TS (1<<TIF_BTS_TRACE_TS)
1da177e4 LT	149
	150	/* work to do on interrupt/exception return */
	151	#define _TIF_WORK_MASK \
	152	(0x0000FFFF & ~(_TIF_SYSCALL_TRACE\|_TIF_SYSCALL_AUDIT\|_TIF_SINGLESTEP\|_TIF_SECCOMP))
	153	/* work to do on any return to user space */
	154	#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
	155
8f4d37ec PZ	156	#define _TIF_DO_NOTIFY_MASK \
	157	(_TIF_SIGPENDING\|_TIF_SINGLESTEP\|_TIF_MCE_NOTIFY\|_TIF_HRTICK_RESCHED)
	158
d3a4f48d	159	/* flags to check in __switch_to() */
eee3af4a MM	160	#define _TIF_WORK_CTXSW \
	161	(_TIF_IO_BITMAP\|_TIF_DEBUGCTLMSR\|_TIF_DS_AREA_MSR\|_TIF_BTS_TRACE_TS)
	162	#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
	163	#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW\|_TIF_DEBUG)
d3a4f48d	164
1da177e4 LT	165	#define PREEMPT_ACTIVE 0x10000000
	166
	167	/*
	168	* Thread-synchronous status.
	169	*
	170	* This is different from the flags in that nobody else
	171	* ever touches our thread-synchronous status, so we don't
	172	* have to worry about atomic accesses.
	173	*/
	174	#define TS_USEDFPU 0x0001 /* FPU was used by this task this quantum (SMP) */
bf2fcc6f	175	#define TS_COMPAT 0x0002 /* 32bit syscall active */
495ab9c0 AK	176	#define TS_POLLING 0x0004 /* true if in idle loop and not sleeping */
495ab9c0 AK	177
c9f4f06d	178	#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
1da177e4 LT	179
	180	#endif /* __KERNEL__ */
	181
	182	#endif /* _ASM_THREAD_INFO_H */