[deliverable/linux.git] / include / asm-x86 / thread_info.h

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

#ifndef _ASM_X86_THREAD_INFO_H
#define _ASM_X86_THREAD_INFO_H

#include <linux/compiler.h>
#include <asm/page.h>
#include <asm/types.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 */
	unsigned long		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;
	void __user		*sysenter_return;
#ifdef CONFIG_X86_32
	unsigned long           previous_esp;   /* ESP of the previous stack in
						   case of nested (IRQ) stacks
						*/
	__u8			supervisor_stack[0];
#endif
};

#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)

#else /* !__ASSEMBLY__ */

#include <asm/asm-offsets.h>

#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_EMU		6	/* syscall emulation active */
#define TIF_SYSCALL_AUDIT	7	/* syscall auditing active */
#define TIF_SECCOMP		8	/* secure computing */
#define TIF_MCE_NOTIFY		10	/* notify userspace of an MCE */
#define TIF_NOTSC		16	/* TSC is not accessible in userland */
#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_EMU	(1 << TIF_SYSCALL_EMU)
#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
#define _TIF_MCE_NOTIFY		(1 << TIF_MCE_NOTIFY)
#define _TIF_NOTSC		(1 << TIF_NOTSC)
#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 in syscall_trace_enter() */
#define _TIF_WORK_SYSCALL_ENTRY	\
	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_EMU | \
	 _TIF_SYSCALL_AUDIT | _TIF_SECCOMP | _TIF_SINGLESTEP)

/* work to do in syscall_trace_leave() */
#define _TIF_WORK_SYSCALL_EXIT	\
	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | _TIF_SINGLESTEP)

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

/* work to do on any return to user space */
#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)

/* Only used for 64 bit */
#define _TIF_DO_NOTIFY_MASK						\
	(_TIF_SIGPENDING|_TIF_MCE_NOTIFY)

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

#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW|_TIF_DEBUG)

#define PREEMPT_ACTIVE		0x10000000

/* thread information allocation */
#ifdef CONFIG_DEBUG_STACK_USAGE
#define THREAD_FLAGS (GFP_KERNEL | __GFP_ZERO)
#else
#define THREAD_FLAGS GFP_KERNEL
#endif

#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR

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

#ifdef CONFIG_X86_32

#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__


/* 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));
}

#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

#else /* X86_32 */

#include <asm/pda.h>

/*
 * macros/functions for gaining access to the thread information structure
 * preempt_count needs to be 1 initially, until the scheduler is functional.
 */
#ifndef __ASSEMBLY__
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;
}

#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

#endif /* !X86_32 */

/*
 * 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 (64BIT)*/
#define TS_POLLING		0x0004	/* true if in idle loop
					   and not sleeping */
#define TS_RESTORE_SIGMASK	0x0008	/* restore signal mask in do_signal() */

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

#ifndef __ASSEMBLY__
#define HAVE_SET_RESTORE_SIGMASK	1
static inline void set_restore_sigmask(void)
{
	struct thread_info *ti = current_thread_info();
	ti->status |= TS_RESTORE_SIGMASK;
	set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags);
}
#endif	/* !__ASSEMBLY__ */

#ifndef __ASSEMBLY__
extern void arch_task_cache_init(void);
extern void free_thread_info(struct thread_info *ti);
extern int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src);
#define arch_task_cache_init arch_task_cache_init
#endif
#endif /* _ASM_X86_THREAD_INFO_H */
Commit	Line	Data
2052e8d4 CL	1	/* thread_info.h: 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
61c4628b	7	#ifndef _ASM_X86_THREAD_INFO_H
2052e8d4 CL	8	#define _ASM_X86_THREAD_INFO_H
2052e8d4 CL	9
2052e8d4 CL	10	#include <linux/compiler.h>
2052e8d4 CL	11	#include <asm/page.h>
12a638e1 CL	12	#include <asm/types.h>
12a638e1 CL	13
2052e8d4 CL	14	/*
	15	* low level task data that entry.S needs immediate access to
	16	* - this struct should fit entirely inside of one cache line
	17	* - this struct shares the supervisor stack pages
2052e8d4 CL	18	*/
2052e8d4 CL	19	#ifndef __ASSEMBLY__
006c484b CL	20	struct task_struct;
	21	struct exec_domain;
	22	#include <asm/processor.h>
2052e8d4 CL	23
	24	struct thread_info {
	25	struct task_struct task; / main task structure */
	26	struct exec_domain exec_domain; / execution domain */
dedd4915	27	unsigned long flags; /* low level flags */
006c484b	28	__u32 status; /* thread synchronous flags */
2052e8d4	29	__u32 cpu; /* current CPU */
dedd4915	30	int preempt_count; /* 0 => preemptable,
2052e8d4	31	<0 => BUG */
006c484b	32	mm_segment_t addr_limit;
2052e8d4	33	struct restart_block restart_block;
006c484b CL	34	void __user *sysenter_return;
006c484b CL	35	#ifdef CONFIG_X86_32
2052e8d4 CL	36	unsigned long previous_esp; /* ESP of the previous stack in
	37	case of nested (IRQ) stacks
	38	*/
	39	__u8 supervisor_stack[0];
006c484b	40	#endif
2052e8d4	41	};
3351cc03 CL	42
	43	#define INIT_THREAD_INFO(tsk) \
	44	{ \
	45	.task = &tsk, \
	46	.exec_domain = &default_exec_domain, \
	47	.flags = 0, \
	48	.cpu = 0, \
	49	.preempt_count = 1, \
	50	.addr_limit = KERNEL_DS, \
	51	.restart_block = { \
	52	.fn = do_no_restart_syscall, \
	53	}, \
	54	}
	55
	56	#define init_thread_info (init_thread_union.thread_info)
	57	#define init_stack (init_thread_union.stack)
	58
2052e8d4 CL	59	#else /* !__ASSEMBLY__ */
	60
	61	#include <asm/asm-offsets.h>
	62
	63	#endif
	64
e57549b0 CL	65	/*
	66	* thread information flags
	67	* - these are process state flags that various assembly files
	68	* may need to access
	69	* - pending work-to-be-done flags are in LSW
	70	* - other flags in MSW
	71	* Warning: layout of LSW is hardcoded in entry.S
	72	*/
	73	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
	74	#define TIF_SIGPENDING 2 /* signal pending */
	75	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
	76	#define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/
	77	#define TIF_IRET 5 /* force IRET */
e57549b0	78	#define TIF_SYSCALL_EMU 6 /* syscall emulation active */
e57549b0 CL	79	#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
e57549b0 CL	80	#define TIF_SECCOMP 8 /* secure computing */
e57549b0	81	#define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */
e57549b0 CL	82	#define TIF_NOTSC 16 /* TSC is not accessible in userland */
	83	#define TIF_IA32 17 /* 32bit process */
	84	#define TIF_FORK 18 /* ret_from_fork */
	85	#define TIF_ABI_PENDING 19
	86	#define TIF_MEMDIE 20
	87	#define TIF_DEBUG 21 /* uses debug registers */
	88	#define TIF_IO_BITMAP 22 /* uses I/O bitmap */
	89	#define TIF_FREEZE 23 /* is freezing for suspend */
	90	#define TIF_FORCED_TF 24 /* true if TF in eflags artificially */
	91	#define TIF_DEBUGCTLMSR 25 /* uses thread_struct.debugctlmsr */
	92	#define TIF_DS_AREA_MSR 26 /* uses thread_struct.ds_area_msr */
	93	#define TIF_BTS_TRACE_TS 27 /* record scheduling event timestamps */
	94
	95	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
	96	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
	97	#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
	98	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
	99	#define _TIF_IRET (1 << TIF_IRET)
e57549b0	100	#define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU)
e57549b0 CL	101	#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
e57549b0 CL	102	#define _TIF_SECCOMP (1 << TIF_SECCOMP)
e57549b0	103	#define _TIF_MCE_NOTIFY (1 << TIF_MCE_NOTIFY)
e57549b0 CL	104	#define _TIF_NOTSC (1 << TIF_NOTSC)
	105	#define _TIF_IA32 (1 << TIF_IA32)
	106	#define _TIF_FORK (1 << TIF_FORK)
	107	#define _TIF_ABI_PENDING (1 << TIF_ABI_PENDING)
	108	#define _TIF_DEBUG (1 << TIF_DEBUG)
	109	#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP)
	110	#define _TIF_FREEZE (1 << TIF_FREEZE)
	111	#define _TIF_FORCED_TF (1 << TIF_FORCED_TF)
	112	#define _TIF_DEBUGCTLMSR (1 << TIF_DEBUGCTLMSR)
	113	#define _TIF_DS_AREA_MSR (1 << TIF_DS_AREA_MSR)
	114	#define _TIF_BTS_TRACE_TS (1 << TIF_BTS_TRACE_TS)
	115
d4d67150 RM	116	/* work to do in syscall_trace_enter() */
	117	#define _TIF_WORK_SYSCALL_ENTRY \
	118	(_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_EMU \| \
380fdd75	119	_TIF_SYSCALL_AUDIT \| _TIF_SECCOMP \| _TIF_SINGLESTEP)
d4d67150 RM	120
	121	/* work to do in syscall_trace_leave() */
	122	#define _TIF_WORK_SYSCALL_EXIT \
	123	(_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_AUDIT \| _TIF_SINGLESTEP)
	124
00c1bb13 CL	125	/* work to do on interrupt/exception return */
	126	#define _TIF_WORK_MASK \
	127	(0x0000FFFF & \
64f09733	128	~(_TIF_SYSCALL_TRACE\|_TIF_SYSCALL_AUDIT\| \
d4d67150	129	_TIF_SINGLESTEP\|_TIF_SECCOMP\|_TIF_SYSCALL_EMU))
00c1bb13 CL	130
	131	/* work to do on any return to user space */
	132	#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
	133
b84200b3	134	/* Only used for 64 bit */
00c1bb13	135	#define _TIF_DO_NOTIFY_MASK \
7f9dce38	136	(_TIF_SIGPENDING\|_TIF_MCE_NOTIFY)
00c1bb13 CL	137
	138	/* flags to check in __switch_to() */
	139	#define _TIF_WORK_CTXSW \
	140	(_TIF_IO_BITMAP\|_TIF_DEBUGCTLMSR\|_TIF_DS_AREA_MSR\|_TIF_BTS_TRACE_TS\| \
	141	_TIF_NOTSC)
	142
	143	#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
	144	#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW\|_TIF_DEBUG)
	145
24e2de6e CL	146	#define PREEMPT_ACTIVE 0x10000000
24e2de6e CL	147
b84200b3 CL	148	/* thread information allocation */
	149	#ifdef CONFIG_DEBUG_STACK_USAGE
	150	#define THREAD_FLAGS (GFP_KERNEL \| __GFP_ZERO)
96a388de	151	#else
b84200b3	152	#define THREAD_FLAGS GFP_KERNEL
96a388de	153	#endif
61c4628b	154
b69c49b7 FT	155	#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
b69c49b7 FT	156
b84200b3 CL	157	#define alloc_thread_info(tsk) \
	158	((struct thread_info *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER))
	159
	160	#ifdef CONFIG_X86_32
	161
	162	#define STACK_WARN (THREAD_SIZE/8)
2052e8d4 CL	163	/*
	164	* macros/functions for gaining access to the thread information structure
	165	*
	166	* preempt_count needs to be 1 initially, until the scheduler is functional.
	167	*/
	168	#ifndef __ASSEMBLY__
	169
2052e8d4 CL	170
	171	/* how to get the current stack pointer from C */
	172	register unsigned long current_stack_pointer asm("esp") __used;
	173
	174	/* how to get the thread information struct from C */
	175	static inline struct thread_info *current_thread_info(void)
	176	{
	177	return (struct thread_info *)
	178	(current_stack_pointer & ~(THREAD_SIZE - 1));
	179	}
	180
2052e8d4 CL	181	#else /* !__ASSEMBLY__ */
	182
	183	/* how to get the thread information struct from ASM */
	184	#define GET_THREAD_INFO(reg) \
	185	movl $-THREAD_SIZE, reg; \
	186	andl %esp, reg
	187
	188	/* use this one if reg already contains %esp */
	189	#define GET_THREAD_INFO_WITH_ESP(reg) \
	190	andl $-THREAD_SIZE, reg
	191
	192	#endif
	193
2052e8d4 CL	194	#else /* X86_32 */
2052e8d4 CL	195
2052e8d4 CL	196	#include <asm/pda.h>
2052e8d4 CL	197
2052e8d4 CL	198	/*
	199	* macros/functions for gaining access to the thread information structure
	200	* preempt_count needs to be 1 initially, until the scheduler is functional.
	201	*/
	202	#ifndef __ASSEMBLY__
2052e8d4 CL	203	static inline struct thread_info *current_thread_info(void)
	204	{
	205	struct thread_info *ti;
	206	ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE);
	207	return ti;
	208	}
	209
	210	/* do not use in interrupt context */
	211	static inline struct thread_info *stack_thread_info(void)
	212	{
	213	struct thread_info *ti;
	214	asm("andq %%rsp,%0; " : "=r" (ti) : "0" (~(THREAD_SIZE - 1)));
	215	return ti;
	216	}
	217
2052e8d4 CL	218	#else /* !__ASSEMBLY__ */
	219
	220	/* how to get the thread information struct from ASM */
	221	#define GET_THREAD_INFO(reg) \
	222	movq %gs:pda_kernelstack,reg ; \
	223	subq $(THREAD_SIZE-PDA_STACKOFFSET),reg
	224
	225	#endif
	226
f2ea3b1d CL	227	#endif /* !X86_32 */
f2ea3b1d CL	228
2052e8d4 CL	229	/*
	230	* Thread-synchronous status.
	231	*
	232	* This is different from the flags in that nobody else
	233	* ever touches our thread-synchronous status, so we don't
	234	* have to worry about atomic accesses.
	235	*/
	236	#define TS_USEDFPU 0x0001 /* FPU was used by this task
	237	this quantum (SMP) */
f2ea3b1d	238	#define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/
2052e8d4 CL	239	#define TS_POLLING 0x0004 /* true if in idle loop
2052e8d4 CL	240	and not sleeping */
8a6c160a	241	#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */
2052e8d4 CL	242
	243	#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
	244
8a6c160a IM	245	#ifndef __ASSEMBLY__
	246	#define HAVE_SET_RESTORE_SIGMASK 1
	247	static inline void set_restore_sigmask(void)
	248	{
	249	struct thread_info *ti = current_thread_info();
	250	ti->status \|= TS_RESTORE_SIGMASK;
3711ccb0	251	set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags);
8a6c160a IM	252	}
	253	#endif /* !__ASSEMBLY__ */
	254
61c4628b SS	255	#ifndef __ASSEMBLY__
	256	extern void arch_task_cache_init(void);
	257	extern void free_thread_info(struct thread_info *ti);
	258	extern int arch_dup_task_struct(struct task_struct dst, struct task_struct src);
2adee9b3	259	#define arch_task_cache_init arch_task_cache_init
61c4628b SS	260	#endif
61c4628b SS	261	#endif /* _ASM_X86_THREAD_INFO_H */