[deliverable/linux.git] / arch / x86 / include / asm / 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>
#include <asm/ftrace.h>
#include <linux/atomic.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
	unsigned int		sig_on_uaccess_error:1;
	unsigned int		uaccess_err:1;	/* uaccess failed */
};

#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.exec_domain	= &default_exec_domain,	\
	.flags		= 0,			\
	.cpu		= 0,			\
	.preempt_count	= INIT_PREEMPT_COUNT,	\
	.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_NOTIFY_RESUME	1	/* callback before returning to user */
#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_USER_RETURN_NOTIFY	11	/* notify kernel of userspace return */
#define TIF_NOTSC		16	/* TSC is not accessible in userland */
#define TIF_IA32		17	/* IA32 compatibility process */
#define TIF_FORK		18	/* ret_from_fork */
#define TIF_MEMDIE		20	/* is terminating due to OOM killer */
#define TIF_DEBUG		21	/* uses debug registers */
#define TIF_IO_BITMAP		22	/* uses I/O bitmap */
#define TIF_FORCED_TF		24	/* true if TF in eflags artificially */
#define TIF_BLOCKSTEP		25	/* set when we want DEBUGCTLMSR_BTF */
#define TIF_LAZY_MMU_UPDATES	27	/* task is updating the mmu lazily */
#define TIF_SYSCALL_TRACEPOINT	28	/* syscall tracepoint instrumentation */
#define TIF_ADDR32		29	/* 32-bit address space on 64 bits */
#define TIF_X32			30	/* 32-bit native x86-64 binary */

#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
#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_USER_RETURN_NOTIFY	(1 << TIF_USER_RETURN_NOTIFY)
#define _TIF_NOTSC		(1 << TIF_NOTSC)
#define _TIF_IA32		(1 << TIF_IA32)
#define _TIF_FORK		(1 << TIF_FORK)
#define _TIF_DEBUG		(1 << TIF_DEBUG)
#define _TIF_IO_BITMAP		(1 << TIF_IO_BITMAP)
#define _TIF_FORCED_TF		(1 << TIF_FORCED_TF)
#define _TIF_BLOCKSTEP		(1 << TIF_BLOCKSTEP)
#define _TIF_LAZY_MMU_UPDATES	(1 << TIF_LAZY_MMU_UPDATES)
#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
#define _TIF_ADDR32		(1 << TIF_ADDR32)
#define _TIF_X32		(1 << TIF_X32)

/* 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 | _TIF_SYSCALL_TRACEPOINT)

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

/* 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) | _TIF_SYSCALL_TRACEPOINT)

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

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

#define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY)
#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_NOTRACK | __GFP_ZERO)
#else
#define THREAD_FLAGS (GFP_KERNEL | __GFP_NOTRACK)
#endif

#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR

#define alloc_thread_info_node(tsk, node)				\
({									\
	struct page *page = alloc_pages_node(node, THREAD_FLAGS,	\
					     THREAD_ORDER);		\
	struct thread_info *ret = page ? page_address(page) : NULL;	\
									\
	ret;								\
})

#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/percpu.h>
#define KERNEL_STACK_OFFSET (5*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__
DECLARE_PER_CPU(unsigned long, kernel_stack);

static inline struct thread_info *current_thread_info(void)
{
	struct thread_info *ti;
	ti = (void *)(percpu_read_stable(kernel_stack) +
		      KERNEL_STACK_OFFSET - THREAD_SIZE);
	return ti;
}

#else /* !__ASSEMBLY__ */

/* how to get the thread information struct from ASM */
#define GET_THREAD_INFO(reg) \
	movq PER_CPU_VAR(kernel_stack),reg ; \
	subq $(THREAD_SIZE-KERNEL_STACK_OFFSET),reg

/*
 * Same if PER_CPU_VAR(kernel_stack) is, perhaps with some offset, already in
 * a certain register (to be used in assembler memory operands).
 */
#define THREAD_INFO(reg, off) KERNEL_STACK_OFFSET+(off)-THREAD_SIZE(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_COMPAT		0x0002	/* 32bit syscall active (64BIT)*/
#define TS_POLLING		0x0004	/* idle task polling need_resched,
					   skip sending interrupt */
#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);
}

static inline bool is_ia32_task(void)
{
#ifdef CONFIG_X86_32
	return true;
#endif
#ifdef CONFIG_IA32_EMULATION
	if (current_thread_info()->status & TS_COMPAT)
		return true;
#endif
	return false;
}
#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
1965aae3 PA	7	#ifndef _ASM_X86_THREAD_INFO_H
1965aae3 PA	8	#define _ASM_X86_THREAD_INFO_H
2052e8d4	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>
caf4b323	23	#include <asm/ftrace.h>
60063497	24	#include <linux/atomic.h>
2052e8d4 CL	25
	26	struct thread_info {
	27	struct task_struct task; / main task structure */
	28	struct exec_domain exec_domain; / execution domain */
affa219b	29	__u32 flags; /* low level flags */
006c484b	30	__u32 status; /* thread synchronous flags */
2052e8d4	31	__u32 cpu; /* current CPU */
dedd4915	32	int preempt_count; /* 0 => preemptable,
2052e8d4	33	<0 => BUG */
006c484b	34	mm_segment_t addr_limit;
2052e8d4	35	struct restart_block restart_block;
006c484b CL	36	void __user *sysenter_return;
006c484b CL	37	#ifdef CONFIG_X86_32
2052e8d4 CL	38	unsigned long previous_esp; /* ESP of the previous stack in
	39	case of nested (IRQ) stacks
	40	*/
	41	__u8 supervisor_stack[0];
006c484b	42	#endif
bccd1729 AV	43	unsigned int sig_on_uaccess_error:1;
bccd1729 AV	44	unsigned int uaccess_err:1; /* uaccess failed */
2052e8d4	45	};
3351cc03 CL	46
	47	#define INIT_THREAD_INFO(tsk) \
	48	{ \
	49	.task = &tsk, \
	50	.exec_domain = &default_exec_domain, \
	51	.flags = 0, \
	52	.cpu = 0, \
c99e6efe	53	.preempt_count = INIT_PREEMPT_COUNT, \
3351cc03 CL	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
2052e8d4 CL	63	#else /* !__ASSEMBLY__ */
	64
	65	#include <asm/asm-offsets.h>
	66
	67	#endif
	68
e57549b0 CL	69	/*
	70	* thread information flags
	71	* - these are process state flags that various assembly files
	72	* may need to access
	73	* - pending work-to-be-done flags are in LSW
	74	* - other flags in MSW
	75	* Warning: layout of LSW is hardcoded in entry.S
	76	*/
	77	#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
59e52130	78	#define TIF_NOTIFY_RESUME 1 /* callback before returning to user */
e57549b0 CL	79	#define TIF_SIGPENDING 2 /* signal pending */
	80	#define TIF_NEED_RESCHED 3 /* rescheduling necessary */
	81	#define TIF_SINGLESTEP 4 /* reenable singlestep on user return*/
	82	#define TIF_IRET 5 /* force IRET */
e57549b0	83	#define TIF_SYSCALL_EMU 6 /* syscall emulation active */
e57549b0 CL	84	#define TIF_SYSCALL_AUDIT 7 /* syscall auditing active */
e57549b0 CL	85	#define TIF_SECCOMP 8 /* secure computing */
e57549b0	86	#define TIF_MCE_NOTIFY 10 /* notify userspace of an MCE */
7c68af6e	87	#define TIF_USER_RETURN_NOTIFY 11 /* notify kernel of userspace return */
e57549b0	88	#define TIF_NOTSC 16 /* TSC is not accessible in userland */
6bd33008	89	#define TIF_IA32 17 /* IA32 compatibility process */
e57549b0	90	#define TIF_FORK 18 /* ret_from_fork */
0ddc9324	91	#define TIF_MEMDIE 20 /* is terminating due to OOM killer */
e57549b0 CL	92	#define TIF_DEBUG 21 /* uses debug registers */
e57549b0 CL	93	#define TIF_IO_BITMAP 22 /* uses I/O bitmap */
e57549b0	94	#define TIF_FORCED_TF 24 /* true if TF in eflags artificially */
ea8e61b7	95	#define TIF_BLOCKSTEP 25 /* set when we want DEBUGCTLMSR_BTF */
b407fc57	96	#define TIF_LAZY_MMU_UPDATES 27 /* task is updating the mmu lazily */
66700001	97	#define TIF_SYSCALL_TRACEPOINT 28 /* syscall tracepoint instrumentation */
6bd33008	98	#define TIF_ADDR32 29 /* 32-bit address space on 64 bits */
bb212724	99	#define TIF_X32 30 /* 32-bit native x86-64 binary */
e57549b0 CL	100
e57549b0 CL	101	#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
59e52130	102	#define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
e57549b0 CL	103	#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
	104	#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
	105	#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
	106	#define _TIF_IRET (1 << TIF_IRET)
e57549b0	107	#define _TIF_SYSCALL_EMU (1 << TIF_SYSCALL_EMU)
e57549b0 CL	108	#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
e57549b0 CL	109	#define _TIF_SECCOMP (1 << TIF_SECCOMP)
e57549b0	110	#define _TIF_MCE_NOTIFY (1 << TIF_MCE_NOTIFY)
7c68af6e	111	#define _TIF_USER_RETURN_NOTIFY (1 << TIF_USER_RETURN_NOTIFY)
e57549b0 CL	112	#define _TIF_NOTSC (1 << TIF_NOTSC)
	113	#define _TIF_IA32 (1 << TIF_IA32)
	114	#define _TIF_FORK (1 << TIF_FORK)
e57549b0 CL	115	#define _TIF_DEBUG (1 << TIF_DEBUG)
e57549b0 CL	116	#define _TIF_IO_BITMAP (1 << TIF_IO_BITMAP)
e57549b0	117	#define _TIF_FORCED_TF (1 << TIF_FORCED_TF)
ea8e61b7	118	#define _TIF_BLOCKSTEP (1 << TIF_BLOCKSTEP)
b407fc57	119	#define _TIF_LAZY_MMU_UPDATES (1 << TIF_LAZY_MMU_UPDATES)
66700001	120	#define _TIF_SYSCALL_TRACEPOINT (1 << TIF_SYSCALL_TRACEPOINT)
6bd33008	121	#define _TIF_ADDR32 (1 << TIF_ADDR32)
bb212724	122	#define _TIF_X32 (1 << TIF_X32)
e57549b0	123
d4d67150 RM	124	/* work to do in syscall_trace_enter() */
d4d67150 RM	125	#define _TIF_WORK_SYSCALL_ENTRY \
66700001 JS	126	(_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_EMU \| _TIF_SYSCALL_AUDIT \| \
66700001 JS	127	_TIF_SECCOMP \| _TIF_SINGLESTEP \| _TIF_SYSCALL_TRACEPOINT)
d4d67150 RM	128
	129	/* work to do in syscall_trace_leave() */
	130	#define _TIF_WORK_SYSCALL_EXIT \
1b3fa2ce	131	(_TIF_SYSCALL_TRACE \| _TIF_SYSCALL_AUDIT \| _TIF_SINGLESTEP \| \
66700001	132	_TIF_SYSCALL_TRACEPOINT)
d4d67150	133
00c1bb13 CL	134	/* work to do on interrupt/exception return */
	135	#define _TIF_WORK_MASK \
	136	(0x0000FFFF & \
64f09733	137	~(_TIF_SYSCALL_TRACE\|_TIF_SYSCALL_AUDIT\| \
d4d67150	138	_TIF_SINGLESTEP\|_TIF_SECCOMP\|_TIF_SYSCALL_EMU))
00c1bb13 CL	139
00c1bb13 CL	140	/* work to do on any return to user space */
66700001 JS	141	#define _TIF_ALLWORK_MASK \
66700001 JS	142	((0x0000FFFF & ~_TIF_SECCOMP) \| _TIF_SYSCALL_TRACEPOINT)
00c1bb13	143
b84200b3	144	/* Only used for 64 bit */
00c1bb13	145	#define _TIF_DO_NOTIFY_MASK \
7c68af6e AK	146	(_TIF_SIGPENDING \| _TIF_MCE_NOTIFY \| _TIF_NOTIFY_RESUME \| \
7c68af6e AK	147	_TIF_USER_RETURN_NOTIFY)
00c1bb13 CL	148
	149	/* flags to check in __switch_to() */
	150	#define _TIF_WORK_CTXSW \
ea8e61b7	151	(_TIF_IO_BITMAP\|_TIF_NOTSC\|_TIF_BLOCKSTEP)
00c1bb13	152
7c68af6e	153	#define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW\|_TIF_USER_RETURN_NOTIFY)
00c1bb13 CL	154	#define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW\|_TIF_DEBUG)
00c1bb13 CL	155
24e2de6e CL	156	#define PREEMPT_ACTIVE 0x10000000
24e2de6e CL	157
b84200b3 CL	158	/* thread information allocation */
b84200b3 CL	159	#ifdef CONFIG_DEBUG_STACK_USAGE
b1eeab67	160	#define THREAD_FLAGS (GFP_KERNEL \| __GFP_NOTRACK \| __GFP_ZERO)
96a388de	161	#else
b1eeab67	162	#define THREAD_FLAGS (GFP_KERNEL \| __GFP_NOTRACK)
96a388de	163	#endif
61c4628b	164
b69c49b7 FT	165	#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
b69c49b7 FT	166
b6a84016 ED	167	#define alloc_thread_info_node(tsk, node) \
	168	({ \
	169	struct page *page = alloc_pages_node(node, THREAD_FLAGS, \
	170	THREAD_ORDER); \
	171	struct thread_info *ret = page ? page_address(page) : NULL; \
	172	\
	173	ret; \
	174	})
b84200b3 CL	175
	176	#ifdef CONFIG_X86_32
	177
	178	#define STACK_WARN (THREAD_SIZE/8)
2052e8d4 CL	179	/*
	180	* macros/functions for gaining access to the thread information structure
	181	*
	182	* preempt_count needs to be 1 initially, until the scheduler is functional.
	183	*/
	184	#ifndef __ASSEMBLY__
	185
2052e8d4 CL	186
	187	/* how to get the current stack pointer from C */
	188	register unsigned long current_stack_pointer asm("esp") __used;
	189
	190	/* how to get the thread information struct from C */
	191	static inline struct thread_info *current_thread_info(void)
	192	{
	193	return (struct thread_info *)
	194	(current_stack_pointer & ~(THREAD_SIZE - 1));
	195	}
	196
2052e8d4 CL	197	#else /* !__ASSEMBLY__ */
	198
	199	/* how to get the thread information struct from ASM */
	200	#define GET_THREAD_INFO(reg) \
	201	movl $-THREAD_SIZE, reg; \
	202	andl %esp, reg
	203
	204	/* use this one if reg already contains %esp */
	205	#define GET_THREAD_INFO_WITH_ESP(reg) \
	206	andl $-THREAD_SIZE, reg
	207
	208	#endif
	209
2052e8d4 CL	210	#else /* X86_32 */
2052e8d4 CL	211
9af45651 BG	212	#include <asm/percpu.h>
9af45651 BG	213	#define KERNEL_STACK_OFFSET (5*8)
2052e8d4	214
2052e8d4 CL	215	/*
	216	* macros/functions for gaining access to the thread information structure
	217	* preempt_count needs to be 1 initially, until the scheduler is functional.
	218	*/
	219	#ifndef __ASSEMBLY__
9af45651	220	DECLARE_PER_CPU(unsigned long, kernel_stack);
2052e8d4	221
9af45651	222	static inline struct thread_info *current_thread_info(void)
2052e8d4 CL	223	{
2052e8d4 CL	224	struct thread_info *ti;
ed8d9adf	225	ti = (void *)(percpu_read_stable(kernel_stack) +
9af45651	226	KERNEL_STACK_OFFSET - THREAD_SIZE);
2052e8d4 CL	227	return ti;
	228	}
	229
2052e8d4 CL	230	#else /* !__ASSEMBLY__ */
	231
	232	/* how to get the thread information struct from ASM */
	233	#define GET_THREAD_INFO(reg) \
9af45651 BG	234	movq PER_CPU_VAR(kernel_stack),reg ; \
9af45651 BG	235	subq $(THREAD_SIZE-KERNEL_STACK_OFFSET),reg
2052e8d4	236
46db09d3 JB	237	/*
	238	* Same if PER_CPU_VAR(kernel_stack) is, perhaps with some offset, already in
	239	* a certain register (to be used in assembler memory operands).
	240	*/
	241	#define THREAD_INFO(reg, off) KERNEL_STACK_OFFSET+(off)-THREAD_SIZE(reg)
	242
2052e8d4 CL	243	#endif
2052e8d4 CL	244
f2ea3b1d CL	245	#endif /* !X86_32 */
f2ea3b1d CL	246
2052e8d4 CL	247	/*
	248	* Thread-synchronous status.
	249	*
	250	* This is different from the flags in that nobody else
	251	* ever touches our thread-synchronous status, so we don't
	252	* have to worry about atomic accesses.
	253	*/
f2ea3b1d	254	#define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/
e45b7fa2 LB	255	#define TS_POLLING 0x0004 /* idle task polling need_resched,
e45b7fa2 LB	256	skip sending interrupt */
8a6c160a	257	#define TS_RESTORE_SIGMASK 0x0008 /* restore signal mask in do_signal() */
2052e8d4 CL	258
	259	#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
	260
8a6c160a IM	261	#ifndef __ASSEMBLY__
	262	#define HAVE_SET_RESTORE_SIGMASK 1
	263	static inline void set_restore_sigmask(void)
	264	{
	265	struct thread_info *ti = current_thread_info();
	266	ti->status \|= TS_RESTORE_SIGMASK;
3711ccb0	267	set_bit(TIF_SIGPENDING, (unsigned long *)&ti->flags);
8a6c160a	268	}
ef334a20 SD	269
	270	static inline bool is_ia32_task(void)
	271	{
	272	#ifdef CONFIG_X86_32
	273	return true;
	274	#endif
	275	#ifdef CONFIG_IA32_EMULATION
	276	if (current_thread_info()->status & TS_COMPAT)
	277	return true;
	278	#endif
	279	return false;
	280	}
8a6c160a IM	281	#endif /* !__ASSEMBLY__ */
8a6c160a IM	282
61c4628b SS	283	#ifndef __ASSEMBLY__
	284	extern void arch_task_cache_init(void);
	285	extern void free_thread_info(struct thread_info *ti);
	286	extern int arch_dup_task_struct(struct task_struct dst, struct task_struct src);
2adee9b3	287	#define arch_task_cache_init arch_task_cache_init
61c4628b	288	#endif
1965aae3	289	#endif /* _ASM_X86_THREAD_INFO_H */