thread_info.h 5.57 KB
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/*
 * Copyright (C) 2002-2003 Hewlett-Packard Co
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 */
#ifndef _ASM_IA64_THREAD_INFO_H
#define _ASM_IA64_THREAD_INFO_H

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#ifndef ASM_OFFSETS_C
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#include <asm/asm-offsets.h>
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#endif
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#include <asm/processor.h>
#include <asm/ptrace.h>

#define PREEMPT_ACTIVE_BIT 30
#define PREEMPT_ACTIVE	(1 << PREEMPT_ACTIVE_BIT)

#ifndef __ASSEMBLY__

/*
 * On IA-64, we want to keep the task structure and kernel stack together, so they can be
 * mapped by a single TLB entry and so they can be addressed by the "current" pointer
 * without having to do pointer masking.
 */
struct thread_info {
	struct task_struct *task;	/* XXX not really needed, except for dup_task_struct() */
	struct exec_domain *exec_domain;/* execution domain */
	__u32 flags;			/* thread_info flags (see TIF_*) */
	__u32 cpu;			/* current CPU */
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	__u32 last_cpu;			/* Last CPU thread ran on */
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	__u32 status;			/* Thread synchronous flags */
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	mm_segment_t addr_limit;	/* user-level address space limit */
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	int preempt_count;		/* 0=premptable, <0=BUG; will also serve as bh-counter */
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	struct restart_block restart_block;
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
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	__u64 ac_stamp;
	__u64 ac_leave;
	__u64 ac_stime;
	__u64 ac_utime;
#endif
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};

#define THREAD_SIZE			KERNEL_STACK_SIZE

#define INIT_THREAD_INFO(tsk)			\
{						\
	.task		= &tsk,			\
	.exec_domain	= &default_exec_domain,	\
	.flags		= 0,			\
	.cpu		= 0,			\
	.addr_limit	= KERNEL_DS,		\
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	.preempt_count	= INIT_PREEMPT_COUNT,	\
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	.restart_block = {			\
		.fn = do_no_restart_syscall,	\
	},					\
}

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#ifndef ASM_OFFSETS_C
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/* how to get the thread information struct from C */
#define current_thread_info()	((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
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#define alloc_thread_info_node(tsk, node)	\
		((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
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#define task_thread_info(tsk)	((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
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#else
#define current_thread_info()	((struct thread_info *) 0)
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#define alloc_thread_info_node(tsk, node)	((struct thread_info *) 0)
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#define task_thread_info(tsk)	((struct thread_info *) 0)
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#endif
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#define free_thread_info(ti)	/* nothing */
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#define task_stack_page(tsk)	((void *)(tsk))

#define __HAVE_THREAD_FUNCTIONS
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#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
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#define setup_thread_stack(p, org)			\
	*task_thread_info(p) = *task_thread_info(org);	\
	task_thread_info(p)->ac_stime = 0;		\
	task_thread_info(p)->ac_utime = 0;		\
	task_thread_info(p)->task = (p);
#else
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#define setup_thread_stack(p, org) \
	*task_thread_info(p) = *task_thread_info(org); \
	task_thread_info(p)->task = (p);
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#endif
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#define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
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#define alloc_task_struct_node(node)						\
({										\
	struct page *page = alloc_pages_node(node, GFP_KERNEL | __GFP_COMP,	\
					     KERNEL_STACK_SIZE_ORDER);		\
	struct task_struct *ret = page ? page_address(page) : NULL;		\
										\
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	ret;									\
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})
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#define free_task_struct(tsk)	free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)

#endif /* !__ASSEMBLY */

/*
 * thread information flags
 * - these are process state flags that various assembly files may need to access
 * - pending work-to-be-done flags are in least-significant 16 bits, other flags
 *   in top 16 bits
 */
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#define TIF_SIGPENDING		0	/* signal pending */
#define TIF_NEED_RESCHED	1	/* rescheduling necessary */
#define TIF_SYSCALL_TRACE	2	/* syscall trace active */
#define TIF_SYSCALL_AUDIT	3	/* syscall auditing active */
#define TIF_SINGLESTEP		4	/* restore singlestep on return to user mode */
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#define TIF_NOTIFY_RESUME	6	/* resumption notification requested */
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#define TIF_MEMDIE		17	/* is terminating due to OOM killer */
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#define TIF_MCA_INIT		18	/* this task is processing MCA or INIT */
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#define TIF_DB_DISABLED		19	/* debug trap disabled for fsyscall */
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#define TIF_RESTORE_RSE		21	/* user RBS is newer than kernel RBS */
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#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
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#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
#define _TIF_SYSCALL_TRACEAUDIT	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
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#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
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#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
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#define _TIF_MCA_INIT		(1 << TIF_MCA_INIT)
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#define _TIF_DB_DISABLED	(1 << TIF_DB_DISABLED)
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#define _TIF_RESTORE_RSE	(1 << TIF_RESTORE_RSE)
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/* "work to do on user-return" bits */
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#define TIF_ALLWORK_MASK	(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
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				 _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
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/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
#define TIF_WORK_MASK		(TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))

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#define TS_POLLING		1 	/* true if in idle loop and not sleeping */
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#define TS_RESTORE_SIGMASK	2	/* restore signal mask in do_signal() */
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#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
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#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;
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	WARN_ON(!test_bit(TIF_SIGPENDING, &ti->flags));
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}
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static inline void clear_restore_sigmask(void)
{
	current_thread_info()->status &= ~TS_RESTORE_SIGMASK;
}
static inline bool test_restore_sigmask(void)
{
	return current_thread_info()->status & TS_RESTORE_SIGMASK;
}
static inline bool test_and_clear_restore_sigmask(void)
{
	struct thread_info *ti = current_thread_info();
	if (!(ti->status & TS_RESTORE_SIGMASK))
		return false;
	ti->status &= ~TS_RESTORE_SIGMASK;
	return true;
}
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#endif	/* !__ASSEMBLY__ */

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#endif /* _ASM_IA64_THREAD_INFO_H */