[net-next-2.6.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 */
	__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;
	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 */
#ifdef CONFIG_X86_32
#define TIF_SYSCALL_EMU		6	/* syscall emulation active */
#endif
#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 */
#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)
#ifdef CONFIG_X86_32
#define _TIF_SYSCALL_EMU	(1 << TIF_SYSCALL_EMU)
#else
#define _TIF_SYSCALL_EMU	0
#endif
#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_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 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)

#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| \
								_TIF_NOTSC)

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


#define PREEMPT_ACTIVE		0x10000000

#ifdef CONFIG_X86_32

#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__


/* 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

#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;
}

/* 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))

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

#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 */
006c484b CL	27	__u32 flags; /* low level flags */
006c484b CL	28	__u32 status; /* thread synchronous flags */
2052e8d4	29	__u32 cpu; /* current CPU */
006c484b	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 */
	78	#ifdef CONFIG_X86_32
	79	#define TIF_SYSCALL_EMU 6 /* syscall emulation active */
	80	#endif
	81	#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
	82	#define TIF_SECCOMP 8 /* secure computing */
	83	#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */
	84	#define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */
	85	#define TIF_HRTICK_RESCHED 11 /* reprogram hrtick timer */
	86	#define TIF_NOTSC 16 /* TSC is not accessible in userland */
	87	#define TIF_IA32 17 /* 32bit process */
	88	#define TIF_FORK 18 /* ret_from_fork */
	89	#define TIF_ABI_PENDING 19
	90	#define TIF_MEMDIE 20
	91	#define TIF_DEBUG 21 /* uses debug registers */
	92	#define TIF_IO_BITMAP 22 /* uses I/O bitmap */
	93	#define TIF_FREEZE 23 /* is freezing for suspend */
	94	#define TIF_FORCED_TF 24 /* true if TF in eflags artificially */
	95	#define TIF_DEBUGCTLMSR 25 /* uses thread_struct.debugctlmsr */
	96	#define TIF_DS_AREA_MSR 26 /* uses thread_struct.ds_area_msr */
	97	#define TIF_BTS_TRACE_TS 27 /* record scheduling event timestamps */
	98
	99	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
	100	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
	101	#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
	102	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
	103	#define _TIF_IRET (1 << TIF_IRET)
	104	#ifdef CONFIG_X86_32
	105	#define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU)
	106	#else
	107	#define _TIF_SYSCALL_EMU 0
	108	#endif
	109	#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
	110	#define _TIF_SECCOMP (1 << TIF_SECCOMP)
	111	#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
	112	#define _TIF_MCE_NOTIFY (1 << TIF_MCE_NOTIFY)
	113	#define _TIF_HRTICK_RESCHED (1 << TIF_HRTICK_RESCHED)
	114	#define _TIF_NOTSC (1 << TIF_NOTSC)
	115	#define _TIF_IA32 (1 << TIF_IA32)
	116	#define _TIF_FORK (1 << TIF_FORK)
	117	#define _TIF_ABI_PENDING (1 << TIF_ABI_PENDING)
	118	#define _TIF_DEBUG (1 << TIF_DEBUG)
	119	#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP)
	120	#define _TIF_FREEZE (1 << TIF_FREEZE)
	121	#define _TIF_FORCED_TF (1 << TIF_FORCED_TF)
	122	#define _TIF_DEBUGCTLMSR (1 << TIF_DEBUGCTLMSR)
	123	#define _TIF_DS_AREA_MSR (1 << TIF_DS_AREA_MSR)
	124	#define _TIF_BTS_TRACE_TS (1 << TIF_BTS_TRACE_TS)
	125
00c1bb13 CL	126	/* work to do on interrupt/exception return */
	127	#define _TIF_WORK_MASK \
	128	(0x0000FFFF & \
	129	~(_TIF_SYSCALL_TRACE\|_TIF_SYSCALL_AUDIT\|_TIF_SINGLESTEP\| \
	130	_TIF_SECCOMP\|_TIF_SYSCALL_EMU))
	131
	132	/* work to do on any return to user space */
	133	#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
	134
	135	#define _TIF_DO_NOTIFY_MASK \
	136	(_TIF_SIGPENDING\|_TIF_SINGLESTEP\|_TIF_MCE_NOTIFY\|_TIF_HRTICK_RESCHED)
	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
	146
24e2de6e CL	147	#define PREEMPT_ACTIVE 0x10000000
24e2de6e CL	148
006c484b CL	149	#ifdef CONFIG_X86_32
006c484b CL	150
2052e8d4 CL	151	#ifdef CONFIG_4KSTACKS
2052e8d4 CL	152	#define THREAD_SIZE (4096)
96a388de	153	#else
2052e8d4	154	#define THREAD_SIZE (8192)
96a388de	155	#endif
61c4628b	156
2052e8d4 CL	157	#define STACK_WARN (THREAD_SIZE/8)
	158	/*
	159	* macros/functions for gaining access to the thread information structure
	160	*
	161	* preempt_count needs to be 1 initially, until the scheduler is functional.
	162	*/
	163	#ifndef __ASSEMBLY__
	164
2052e8d4 CL	165
	166	/* how to get the current stack pointer from C */
	167	register unsigned long current_stack_pointer asm("esp") __used;
	168
	169	/* how to get the thread information struct from C */
	170	static inline struct thread_info *current_thread_info(void)
	171	{
	172	return (struct thread_info *)
	173	(current_stack_pointer & ~(THREAD_SIZE - 1));
	174	}
	175
	176	/* thread information allocation */
	177	#ifdef CONFIG_DEBUG_STACK_USAGE
	178	#define alloc_thread_info(tsk) ((struct thread_info *) \
	179	__get_free_pages(GFP_KERNEL \| __GFP_ZERO, get_order(THREAD_SIZE)))
	180	#else
	181	#define alloc_thread_info(tsk) ((struct thread_info *) \
	182	__get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE)))
	183	#endif
	184
	185	#else /* !__ASSEMBLY__ */
	186
	187	/* how to get the thread information struct from ASM */
	188	#define GET_THREAD_INFO(reg) \
	189	movl $-THREAD_SIZE, reg; \
	190	andl %esp, reg
	191
	192	/* use this one if reg already contains %esp */
	193	#define GET_THREAD_INFO_WITH_ESP(reg) \
	194	andl $-THREAD_SIZE, reg
	195
	196	#endif
	197
2052e8d4 CL	198	#else /* X86_32 */
2052e8d4 CL	199
2052e8d4 CL	200	#include <asm/pda.h>
2052e8d4 CL	201
2052e8d4 CL	202	/*
	203	* macros/functions for gaining access to the thread information structure
	204	* preempt_count needs to be 1 initially, until the scheduler is functional.
	205	*/
	206	#ifndef __ASSEMBLY__
2052e8d4 CL	207	static inline struct thread_info *current_thread_info(void)
	208	{
	209	struct thread_info *ti;
	210	ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE);
	211	return ti;
	212	}
	213
	214	/* do not use in interrupt context */
	215	static inline struct thread_info *stack_thread_info(void)
	216	{
	217	struct thread_info *ti;
	218	asm("andq %%rsp,%0; " : "=r" (ti) : "0" (~(THREAD_SIZE - 1)));
	219	return ti;
	220	}
	221
	222	/* thread information allocation */
	223	#ifdef CONFIG_DEBUG_STACK_USAGE
	224	#define THREAD_FLAGS (GFP_KERNEL \| __GFP_ZERO)
	225	#else
	226	#define THREAD_FLAGS GFP_KERNEL
	227	#endif
	228
	229	#define alloc_thread_info(tsk) \
	230	((struct thread_info *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER))
	231
	232	#else /* !__ASSEMBLY__ */
	233
	234	/* how to get the thread information struct from ASM */
	235	#define GET_THREAD_INFO(reg) \
	236	movq %gs:pda_kernelstack,reg ; \
	237	subq $(THREAD_SIZE-PDA_STACKOFFSET),reg
	238
	239	#endif
	240
f2ea3b1d CL	241	#endif /* !X86_32 */
f2ea3b1d CL	242
2052e8d4 CL	243	/*
	244	* Thread-synchronous status.
	245	*
	246	* This is different from the flags in that nobody else
	247	* ever touches our thread-synchronous status, so we don't
	248	* have to worry about atomic accesses.
	249	*/
	250	#define TS_USEDFPU 0x0001 /* FPU was used by this task
	251	this quantum (SMP) */
f2ea3b1d	252	#define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/
2052e8d4 CL	253	#define TS_POLLING 0x0004 /* true if in idle loop
	254	and not sleeping */
	255
	256	#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
	257
61c4628b SS	258	#ifndef __ASSEMBLY__
	259	extern void arch_task_cache_init(void);
	260	extern void free_thread_info(struct thread_info *ti);
	261	extern int arch_dup_task_struct(struct task_struct dst, struct task_struct src);
2adee9b3	262	#define arch_task_cache_init arch_task_cache_init
61c4628b SS	263	#endif
61c4628b SS	264	#endif /* _ASM_X86_THREAD_INFO_H */