[linux-2.6-block.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

#ifdef CONFIG_X86_32
#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)

#else /* X86_32 */

#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))

#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_NOTSC		28	/* TSC is not accessible in userland */

#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)
#define _TIF_NOTSC		(1 << TIF_NOTSC)

/* 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|_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-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 /* !X86_32 */


#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
96a388de	10	#ifdef CONFIG_X86_32
2052e8d4 CL	11	#include <linux/compiler.h>
	12	#include <asm/page.h>
	13
	14	#ifndef __ASSEMBLY__
	15	#include <asm/processor.h>
	16	#endif
	17
	18	/*
	19	* low level task data that entry.S needs immediate access to
	20	* - this struct should fit entirely inside of one cache line
	21	* - this struct shares the supervisor stack pages
	22	* - if the contents of this structure are changed,
	23	* the assembly constants must also be changed
	24	*/
	25	#ifndef __ASSEMBLY__
	26
	27	struct thread_info {
	28	struct task_struct task; / main task structure */
	29	struct exec_domain exec_domain; / execution domain */
	30	unsigned long flags; /* low level flags */
	31	unsigned long status; /* thread-synchronous flags */
	32	__u32 cpu; /* current CPU */
	33	int preempt_count; /* 0 => preemptable,
	34	<0 => BUG */
	35	mm_segment_t addr_limit; /* thread address space:
	36	0-0xBFFFFFFF user-thread
	37	0-0xFFFFFFFF kernel-thread
	38	*/
	39	void *sysenter_return;
	40	struct restart_block restart_block;
	41	unsigned long previous_esp; /* ESP of the previous stack in
	42	case of nested (IRQ) stacks
	43	*/
	44	__u8 supervisor_stack[0];
	45	};
	46
	47	#else /* !__ASSEMBLY__ */
	48
	49	#include <asm/asm-offsets.h>
	50
	51	#endif
	52
	53	#define PREEMPT_ACTIVE 0x10000000
	54	#ifdef CONFIG_4KSTACKS
	55	#define THREAD_SIZE (4096)
96a388de	56	#else
2052e8d4	57	#define THREAD_SIZE (8192)
96a388de	58	#endif
61c4628b	59
2052e8d4 CL	60	#define STACK_WARN (THREAD_SIZE/8)
	61	/*
	62	* macros/functions for gaining access to the thread information structure
	63	*
	64	* preempt_count needs to be 1 initially, until the scheduler is functional.
	65	*/
	66	#ifndef __ASSEMBLY__
	67
	68	#define INIT_THREAD_INFO(tsk) \
	69	{ \
	70	.task = &tsk, \
	71	.exec_domain = &default_exec_domain, \
	72	.flags = 0, \
	73	.cpu = 0, \
	74	.preempt_count = 1, \
	75	.addr_limit = KERNEL_DS, \
	76	.restart_block = { \
	77	.fn = do_no_restart_syscall, \
	78	}, \
	79	}
	80
	81	#define init_thread_info (init_thread_union.thread_info)
	82	#define init_stack (init_thread_union.stack)
	83
	84
	85	/* how to get the current stack pointer from C */
	86	register unsigned long current_stack_pointer asm("esp") __used;
	87
	88	/* how to get the thread information struct from C */
	89	static inline struct thread_info *current_thread_info(void)
	90	{
	91	return (struct thread_info *)
	92	(current_stack_pointer & ~(THREAD_SIZE - 1));
	93	}
	94
	95	/* thread information allocation */
	96	#ifdef CONFIG_DEBUG_STACK_USAGE
	97	#define alloc_thread_info(tsk) ((struct thread_info *) \
	98	__get_free_pages(GFP_KERNEL \| __GFP_ZERO, get_order(THREAD_SIZE)))
	99	#else
	100	#define alloc_thread_info(tsk) ((struct thread_info *) \
	101	__get_free_pages(GFP_KERNEL, get_order(THREAD_SIZE)))
	102	#endif
	103
	104	#else /* !__ASSEMBLY__ */
	105
	106	/* how to get the thread information struct from ASM */
	107	#define GET_THREAD_INFO(reg) \
	108	movl $-THREAD_SIZE, reg; \
	109	andl %esp, reg
	110
	111	/* use this one if reg already contains %esp */
	112	#define GET_THREAD_INFO_WITH_ESP(reg) \
	113	andl $-THREAD_SIZE, reg
	114
	115	#endif
	116
	117	/*
	118	* thread information flags
	119	* - these are process state flags that various
	120	* assembly files may need to access
	121	* - pending work-to-be-done flags are in LSW
	122	* - other flags in MSW
	123	*/
124	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
125	#define TIF_SIGPENDING 1 /* signal pending */
126	#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
127	#define TIF_SINGLESTEP 3 /* restore singlestep on return to
128	user mode */
129	#define TIF_IRET 4 /* return with iret */
130	#define TIF_SYSCALL_EMU 5 /* syscall emulation active */
131	#define TIF_SYSCALL_AUDIT 6 /* syscall auditing active */
132	#define TIF_SECCOMP 7 /* secure computing */
133	#define TIF_RESTORE_SIGMASK 8 /* restore signal mask in do_signal() */
134	#define TIF_HRTICK_RESCHED 9 /* reprogram hrtick timer */
135	#define TIF_MEMDIE 16
136	#define TIF_DEBUG 17 /* uses debug registers */
137	#define TIF_IO_BITMAP 18 /* uses I/O bitmap */
138	#define TIF_FREEZE 19 /* is freezing for suspend */
139	#define TIF_NOTSC 20 /* TSC is not accessible in userland */
140	#define TIF_FORCED_TF 21 /* true if TF in eflags artificially */
141	#define TIF_DEBUGCTLMSR 22 /* uses thread_struct.debugctlmsr */
142	#define TIF_DS_AREA_MSR 23 /* uses thread_struct.ds_area_msr */
143	#define TIF_BTS_TRACE_TS 24 /* record scheduling event timestamps */
144
145	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
146	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
147	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
148	#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
149	#define _TIF_IRET (1 << TIF_IRET)
150	#define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU)
151	#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
152	#define _TIF_SECCOMP (1 << TIF_SECCOMP)
153	#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
154	#define _TIF_HRTICK_RESCHED (1 << TIF_HRTICK_RESCHED)
155	#define _TIF_DEBUG (1 << TIF_DEBUG)
156	#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP)
157	#define _TIF_FREEZE (1 << TIF_FREEZE)
158	#define _TIF_NOTSC (1 << TIF_NOTSC)
159	#define _TIF_FORCED_TF (1 << TIF_FORCED_TF)
160	#define _TIF_DEBUGCTLMSR (1 << TIF_DEBUGCTLMSR)
161	#define _TIF_DS_AREA_MSR (1 << TIF_DS_AREA_MSR)
162	#define _TIF_BTS_TRACE_TS (1 << TIF_BTS_TRACE_TS)
163
164	/* work to do on interrupt/exception return */
165	#define _TIF_WORK_MASK \
166	(0x0000FFFF & ~(_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_AUDIT \| \
167	_TIF_SECCOMP \| _TIF_SYSCALL_EMU))
168	/* work to do on any return to u-space */
169	#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
170
171	/* flags to check in __switch_to() */
172	#define _TIF_WORK_CTXSW \
173	(_TIF_IO_BITMAP \| _TIF_NOTSC \| _TIF_DEBUGCTLMSR \| \
174	_TIF_DS_AREA_MSR \| _TIF_BTS_TRACE_TS)
175	#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
176	#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW \| _TIF_DEBUG)
177
178
179	/*
180	* Thread-synchronous status.
181	*
182	* This is different from the flags in that nobody else
183	* ever touches our thread-synchronous status, so we don't
184	* have to worry about atomic accesses.
185	*/
186	#define TS_USEDFPU 0x0001 /* FPU was used by this task
187	this quantum (SMP) */
188	#define TS_POLLING 0x0002 /* True if in idle loop
189	and not sleeping */
190
191	#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
192
193	#else /* X86_32 */
194
195	#include <asm/page.h>
196	#include <asm/types.h>
197	#include <asm/pda.h>
198
199	/*
200	* low level task data that entry.S needs immediate access to
201	* - this struct should fit entirely inside of one cache line
202	* - this struct shares the supervisor stack pages
203	*/
204	#ifndef __ASSEMBLY__
205	struct task_struct;
206	struct exec_domain;
207	#include <asm/processor.h>
208
209	struct thread_info {
210	struct task_struct task; / main task structure */
211	struct exec_domain exec_domain; / execution domain */
212	__u32 flags; /* low level flags */
213	__u32 status; /* thread synchronous flags */
214	__u32 cpu; /* current CPU */
215	int preempt_count; /* 0 => preemptable,
216	<0 => BUG */
217	mm_segment_t addr_limit;
218	struct restart_block restart_block;
219	#ifdef CONFIG_IA32_EMULATION
220	void __user *sysenter_return;
221	#endif
222	};
223	#endif
224
225	/*
226	* macros/functions for gaining access to the thread information structure
227	* preempt_count needs to be 1 initially, until the scheduler is functional.
228	*/
229	#ifndef __ASSEMBLY__
230	#define INIT_THREAD_INFO(tsk) \
231	{ \
232	.task = &tsk, \
233	.exec_domain = &default_exec_domain, \
234	.flags = 0, \
235	.cpu = 0, \
236	.preempt_count = 1, \
237	.addr_limit = KERNEL_DS, \
238	.restart_block = { \
239	.fn = do_no_restart_syscall, \
240	}, \
241	}
242
243	#define init_thread_info (init_thread_union.thread_info)
244	#define init_stack (init_thread_union.stack)
245
246	static inline struct thread_info *current_thread_info(void)
247	{
248	struct thread_info *ti;
249	ti = (void *)(read_pda(kernelstack) + PDA_STACKOFFSET - THREAD_SIZE);
250	return ti;
251	}
252
253	/* do not use in interrupt context */
254	static inline struct thread_info *stack_thread_info(void)
255	{
256	struct thread_info *ti;
257	asm("andq %%rsp,%0; " : "=r" (ti) : "0" (~(THREAD_SIZE - 1)));
258	return ti;
259	}
260
261	/* thread information allocation */
262	#ifdef CONFIG_DEBUG_STACK_USAGE
263	#define THREAD_FLAGS (GFP_KERNEL \| __GFP_ZERO)
264	#else
265	#define THREAD_FLAGS GFP_KERNEL
266	#endif
267
268	#define alloc_thread_info(tsk) \
269	((struct thread_info *)__get_free_pages(THREAD_FLAGS, THREAD_ORDER))
270
271	#else /* !__ASSEMBLY__ */
272
273	/* how to get the thread information struct from ASM */
274	#define GET_THREAD_INFO(reg) \
275	movq %gs:pda_kernelstack,reg ; \
276	subq $(THREAD_SIZE-PDA_STACKOFFSET),reg
277
278	#endif
279
280	/*
281	* thread information flags
282	* - these are process state flags that various assembly files
283	* may need to access
284	* - pending work-to-be-done flags are in LSW
285	* - other flags in MSW
286	* Warning: layout of LSW is hardcoded in entry.S
287	*/
288	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
289	#define TIF_SIGPENDING 2 /* signal pending */
290	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
291	#define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/
292	#define TIF_IRET 5 /* force IRET */
293	#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
294	#define TIF_SECCOMP 8 /* secure computing */
295	#define TIF_RESTORE_SIGMASK 9 /* restore signal mask in do_signal */
296	#define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */
297	#define TIF_HRTICK_RESCHED 11 /* reprogram hrtick timer */
298	/* 16 free */
299	#define TIF_IA32 17 /* 32bit process */
300	#define TIF_FORK 18 /* ret_from_fork */
301	#define TIF_ABI_PENDING 19
302	#define TIF_MEMDIE 20
303	#define TIF_DEBUG 21 /* uses debug registers */
304	#define TIF_IO_BITMAP 22 /* uses I/O bitmap */
305	#define TIF_FREEZE 23 /* is freezing for suspend */
306	#define TIF_FORCED_TF 24 /* true if TF in eflags artificially */
307	#define TIF_DEBUGCTLMSR 25 /* uses thread_struct.debugctlmsr */
308	#define TIF_DS_AREA_MSR 26 /* uses thread_struct.ds_area_msr */
309	#define TIF_BTS_TRACE_TS 27 /* record scheduling event timestamps */
310	#define TIF_NOTSC 28 /* TSC is not accessible in userland */
311
312	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
313	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
314	#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
315	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
316	#define _TIF_IRET (1 << TIF_IRET)
317	#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
318	#define _TIF_SECCOMP (1 << TIF_SECCOMP)
319	#define _TIF_RESTORE_SIGMASK (1 << TIF_RESTORE_SIGMASK)
320	#define _TIF_MCE_NOTIFY (1 << TIF_MCE_NOTIFY)
321	#define _TIF_HRTICK_RESCHED (1 << TIF_HRTICK_RESCHED)
322	#define _TIF_IA32 (1 << TIF_IA32)
323	#define _TIF_FORK (1 << TIF_FORK)
324	#define _TIF_ABI_PENDING (1 << TIF_ABI_PENDING)
325	#define _TIF_DEBUG (1 << TIF_DEBUG)
326	#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP)
327	#define _TIF_FREEZE (1 << TIF_FREEZE)
328	#define _TIF_FORCED_TF (1 << TIF_FORCED_TF)
329	#define _TIF_DEBUGCTLMSR (1 << TIF_DEBUGCTLMSR)
330	#define _TIF_DS_AREA_MSR (1 << TIF_DS_AREA_MSR)
331	#define _TIF_BTS_TRACE_TS (1 << TIF_BTS_TRACE_TS)
332	#define _TIF_NOTSC (1 << TIF_NOTSC)
333
334	/* work to do on interrupt/exception return */
335	#define _TIF_WORK_MASK \
336	(0x0000FFFF & \
337	~(_TIF_SYSCALL_TRACE\|_TIF_SYSCALL_AUDIT\|_TIF_SINGLESTEP\|_TIF_SECCOMP))
338	/* work to do on any return to user space */
339	#define _TIF_ALLWORK_MASK (0x0000FFFF & ~_TIF_SECCOMP)
340
341	#define _TIF_DO_NOTIFY_MASK \
342	(_TIF_SIGPENDING\|_TIF_SINGLESTEP\|_TIF_MCE_NOTIFY\|_TIF_HRTICK_RESCHED)
343
344	/* flags to check in __switch_to() */
345	#define _TIF_WORK_CTXSW \
346	(_TIF_IO_BITMAP\|_TIF_DEBUGCTLMSR\|_TIF_DS_AREA_MSR\|_TIF_BTS_TRACE_TS\|_TIF_NOTSC)
347	#define _TIF_WORK_CTXSW_PREV _TIF_WORK_CTXSW
348	#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW\|_TIF_DEBUG)
349
350	#define PREEMPT_ACTIVE 0x10000000
351
352	/*
353	* Thread-synchronous status.
354	*
355	* This is different from the flags in that nobody else
356	* ever touches our thread-synchronous status, so we don't
357	* have to worry about atomic accesses.
358	*/
359	#define TS_USEDFPU 0x0001 /* FPU was used by this task
360	this quantum (SMP) */
361	#define TS_COMPAT 0x0002 /* 32bit syscall active */
362	#define TS_POLLING 0x0004 /* true if in idle loop
363	and not sleeping */
364
365	#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
366
367	#endif /* !X86_32 */
368
369
61c4628b SS	370	#ifndef __ASSEMBLY__
	371	extern void arch_task_cache_init(void);
	372	extern void free_thread_info(struct thread_info *ti);
	373	extern int arch_dup_task_struct(struct task_struct dst, struct task_struct src);
2adee9b3	374	#define arch_task_cache_init arch_task_cache_init
61c4628b SS	375	#endif
61c4628b SS	376	#endif /* _ASM_X86_THREAD_INFO_H */