thread_info.h 5.62 KB
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/*
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 *  arch/arm/include/asm/thread_info.h
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 *
 *  Copyright (C) 2002 Russell King.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_ARM_THREAD_INFO_H
#define __ASM_ARM_THREAD_INFO_H

#ifdef __KERNEL__

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#include <linux/compiler.h>
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#include <asm/fpstate.h>
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#include <asm/page.h>
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#define THREAD_SIZE_ORDER	1
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#define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)
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#define THREAD_START_SP		(THREAD_SIZE - 8)

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#ifndef __ASSEMBLY__

struct task_struct;

#include <asm/types.h>
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#include <ipipe/thread_info.h>
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typedef unsigned long mm_segment_t;

struct cpu_context_save {
	__u32	r4;
	__u32	r5;
	__u32	r6;
	__u32	r7;
	__u32	r8;
	__u32	r9;
	__u32	sl;
	__u32	fp;
	__u32	sp;
	__u32	pc;
	__u32	extra[2];		/* Xscale 'acc' register, etc */
};

/*
 * low level task data that entry.S needs immediate access to.
 * __switch_to() assumes cpu_context follows immediately after cpu_domain.
 */
struct thread_info {
	unsigned long		flags;		/* low level flags */
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	int			preempt_count;	/* 0 => preemptable, <0 => bug */
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	mm_segment_t		addr_limit;	/* address limit */
	struct task_struct	*task;		/* main task structure */
	__u32			cpu;		/* cpu */
	__u32			cpu_domain;	/* cpu domain */
	struct cpu_context_save	cpu_context;	/* cpu context */
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	__u32			syscall;	/* syscall number */
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	__u8			used_cp[16];	/* thread used copro */
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	unsigned long		tp_value[2];	/* TLS registers */
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#ifdef CONFIG_CRUNCH
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	struct crunch_state	crunchstate;
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#endif
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	union fp_state		fpstate __attribute__((aligned(8)));
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	union vfp_state		vfpstate;
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#ifdef CONFIG_ARM_THUMBEE
	unsigned long		thumbee_state;	/* ThumbEE Handler Base register */
#endif
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#ifdef CONFIG_IPIPE
	unsigned long		ipipe_flags;
	struct ipipe_threadinfo ipipe_data;
#endif
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};

#define INIT_THREAD_INFO(tsk)						\
{									\
	.task		= &tsk,						\
	.flags		= 0,						\
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	.preempt_count	= INIT_PREEMPT_COUNT,				\
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	.addr_limit	= KERNEL_DS,					\
}

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/*
 * how to get the current stack pointer in C
 */
register unsigned long current_stack_pointer asm ("sp");

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/*
 * how to get the thread information struct from C
 */
static inline struct thread_info *current_thread_info(void) __attribute_const__;

static inline struct thread_info *current_thread_info(void)
{
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	return (struct thread_info *)
		(current_stack_pointer & ~(THREAD_SIZE - 1));
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}

#define thread_saved_pc(tsk)	\
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	((unsigned long)(task_thread_info(tsk)->cpu_context.pc))
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#define thread_saved_sp(tsk)	\
	((unsigned long)(task_thread_info(tsk)->cpu_context.sp))
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#ifndef CONFIG_THUMB2_KERNEL
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#define thread_saved_fp(tsk)	\
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	((unsigned long)(task_thread_info(tsk)->cpu_context.fp))
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#else
#define thread_saved_fp(tsk)	\
	((unsigned long)(task_thread_info(tsk)->cpu_context.r7))
#endif
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extern void crunch_task_disable(struct thread_info *);
extern void crunch_task_copy(struct thread_info *, void *);
extern void crunch_task_restore(struct thread_info *, void *);
extern void crunch_task_release(struct thread_info *);

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extern void iwmmxt_task_disable(struct thread_info *);
extern void iwmmxt_task_copy(struct thread_info *, void *);
extern void iwmmxt_task_restore(struct thread_info *, void *);
extern void iwmmxt_task_release(struct thread_info *);
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extern void iwmmxt_task_switch(struct thread_info *);
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extern void vfp_sync_hwstate(struct thread_info *);
extern void vfp_flush_hwstate(struct thread_info *);
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struct user_vfp;
struct user_vfp_exc;

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extern int vfp_preserve_user_clear_hwstate(struct user_vfp *,
					   struct user_vfp_exc *);
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extern int vfp_restore_user_hwstate(struct user_vfp *,
				    struct user_vfp_exc *);
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#endif

/*
 * thread information flags:
 *  TIF_USEDFPU		- FPU was used by this task this quantum (SMP)
 *  TIF_POLLING_NRFLAG	- true if poll_idle() is polling TIF_NEED_RESCHED
 */
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#define TIF_SIGPENDING		0	/* signal pending */
#define TIF_NEED_RESCHED	1	/* rescheduling necessary */
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#define TIF_NOTIFY_RESUME	2	/* callback before returning to user */
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#define TIF_UPROBE		3	/* breakpointed or singlestepping */
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#define TIF_SYSCALL_TRACE	4	/* syscall trace active */
#define TIF_SYSCALL_AUDIT	5	/* syscall auditing active */
#define TIF_SYSCALL_TRACEPOINT	6	/* syscall tracepoint instrumentation */
#define TIF_SECCOMP		7	/* seccomp syscall filtering active */
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#define TIF_NOHZ		12	/* in adaptive nohz mode */
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#define TIF_USING_IWMMXT	17
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#define TIF_MEMDIE		18	/* is terminating due to OOM killer */
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#define TIF_RESTORE_SIGMASK	20
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#define TIF_MMSWITCH_INT	23	/* MMU context switch preempted */

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#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
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#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
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#define _TIF_UPROBE		(1 << TIF_UPROBE)
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#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
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#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
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#define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
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#define _TIF_SECCOMP		(1 << TIF_SECCOMP)
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#define _TIF_USING_IWMMXT	(1 << TIF_USING_IWMMXT)
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#define _TIF_MMSWITCH_INT	(1 << TIF_MMSWITCH_INT)

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/* Checks for any syscall work in entry-common.S */
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#define _TIF_SYSCALL_WORK (_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
			   _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP)
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/*
 * Change these and you break ASM code in entry-common.S
 */
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#define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
				 _TIF_NOTIFY_RESUME | _TIF_UPROBE)
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/* ti->ipipe_flags */
#define TIP_MAYDAY	0	/* MAYDAY call is pending */
#define TIP_NOTIFY	1	/* Notify head domain about kernel events */
#define TIP_HEAD	2	/* Runs in head domain */

#define _TIP_MAYDAY	(1 << TIP_MAYDAY)
#define _TIP_NOTIFY	(1 << TIP_NOTIFY)
#define _TIP_HEAD	(1 << TIP_HEAD)

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#endif /* __KERNEL__ */
#endif /* __ASM_ARM_THREAD_INFO_H */