1/*
  2 * Copyright (C) 2002-2003 Hewlett-Packard Co
  3 *	David Mosberger-Tang <davidm@hpl.hp.com>
  4 */
  5#ifndef _ASM_IA64_THREAD_INFO_H
  6#define _ASM_IA64_THREAD_INFO_H
  7
  8#ifndef ASM_OFFSETS_C
  9#include <asm/asm-offsets.h>
 10#endif
 11#include <asm/processor.h>
 12#include <asm/ptrace.h>
 13
 14#ifndef __ASSEMBLY__
 15
 16/*
 17 * On IA-64, we want to keep the task structure and kernel stack together, so they can be
 18 * mapped by a single TLB entry and so they can be addressed by the "current" pointer
 19 * without having to do pointer masking.
 20 */
 21struct thread_info {
 22	struct task_struct *task;	/* XXX not really needed, except for dup_task_struct() */
 23	__u32 flags;			/* thread_info flags (see TIF_*) */
 24	__u32 cpu;			/* current CPU */
 25	__u32 last_cpu;			/* Last CPU thread ran on */
 26	__u32 status;			/* Thread synchronous flags */
 27	mm_segment_t addr_limit;	/* user-level address space limit */
 28	int preempt_count;		/* 0=premptable, <0=BUG; will also serve as bh-counter */
 29#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
 30	__u64 ac_stamp;
 31	__u64 ac_leave;
 32	__u64 ac_stime;
 33	__u64 ac_utime;
 34#endif
 35};
 36
 37#define THREAD_SIZE			KERNEL_STACK_SIZE
 38
 39#define INIT_THREAD_INFO(tsk)			\
 40{						\
 41	.task		= &tsk,			\
 42	.flags		= 0,			\
 43	.cpu		= 0,			\
 44	.addr_limit	= KERNEL_DS,		\
 45	.preempt_count	= INIT_PREEMPT_COUNT,	\
 46}
 47
 48#ifndef ASM_OFFSETS_C
 49/* how to get the thread information struct from C */
 50#define current_thread_info()	((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
 51#define alloc_thread_stack_node(tsk, node)	\
 52		((unsigned long *) ((char *) (tsk) + IA64_TASK_SIZE))
 53#define task_thread_info(tsk)	((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
 54#else
 55#define current_thread_info()	((struct thread_info *) 0)
 56#define alloc_thread_stack_node(tsk, node)	((unsigned long *) 0)
 57#define task_thread_info(tsk)	((struct thread_info *) 0)
 58#endif
 59#define free_thread_stack(tsk)	/* nothing */
 60#define task_stack_page(tsk)	((void *)(tsk))
 61
 62#define __HAVE_THREAD_FUNCTIONS
 63#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
 64#define setup_thread_stack(p, org)			\
 65	*task_thread_info(p) = *task_thread_info(org);	\
 66	task_thread_info(p)->ac_stime = 0;		\
 67	task_thread_info(p)->ac_utime = 0;		\
 68	task_thread_info(p)->task = (p);
 69#else
 70#define setup_thread_stack(p, org) \
 71	*task_thread_info(p) = *task_thread_info(org); \
 72	task_thread_info(p)->task = (p);
 73#endif
 74#define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
 75
 76#define alloc_task_struct_node(node)						\
 77({										\
 78	struct page *page = alloc_pages_node(node, GFP_KERNEL | __GFP_COMP,	\
 79					     KERNEL_STACK_SIZE_ORDER);		\
 80	struct task_struct *ret = page ? page_address(page) : NULL;		\
 81										\
 82	ret;									\
 83})
 84#define free_task_struct(tsk)	free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
 85
 86#endif /* !__ASSEMBLY */
 87
 88/*
 89 * thread information flags
 90 * - these are process state flags that various assembly files may need to access
 91 * - pending work-to-be-done flags are in least-significant 16 bits, other flags
 92 *   in top 16 bits
 93 */
 94#define TIF_SIGPENDING		0	/* signal pending */
 95#define TIF_NEED_RESCHED	1	/* rescheduling necessary */
 96#define TIF_SYSCALL_TRACE	2	/* syscall trace active */
 97#define TIF_SYSCALL_AUDIT	3	/* syscall auditing active */
 98#define TIF_SINGLESTEP		4	/* restore singlestep on return to user mode */
 99#define TIF_NOTIFY_RESUME	6	/* resumption notification requested */
100#define TIF_MEMDIE		17	/* is terminating due to OOM killer */
101#define TIF_MCA_INIT		18	/* this task is processing MCA or INIT */
102#define TIF_DB_DISABLED		19	/* debug trap disabled for fsyscall */
103#define TIF_RESTORE_RSE		21	/* user RBS is newer than kernel RBS */
104#define TIF_POLLING_NRFLAG	22	/* idle is polling for TIF_NEED_RESCHED */
105
106#define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
107#define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
108#define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
109#define _TIF_SYSCALL_TRACEAUDIT	(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
110#define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
111#define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
112#define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
113#define _TIF_MCA_INIT		(1 << TIF_MCA_INIT)
114#define _TIF_DB_DISABLED	(1 << TIF_DB_DISABLED)
115#define _TIF_RESTORE_RSE	(1 << TIF_RESTORE_RSE)
116#define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
117
118/* "work to do on user-return" bits */
119#define TIF_ALLWORK_MASK	(_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
120				 _TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE)
121/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
122#define TIF_WORK_MASK		(TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
123
124#endif /* _ASM_IA64_THREAD_INFO_H */