2 * Copyright (C) 2002-2003 Hewlett-Packard Co
3 * David Mosberger-Tang <davidm@hpl.hp.com>
5 #ifndef _ASM_IA64_THREAD_INFO_H
6 #define _ASM_IA64_THREAD_INFO_H
9 #include <asm/asm-offsets.h>
11 #include <asm/processor.h>
12 #include <asm/ptrace.h>
14 #define PREEMPT_ACTIVE_BIT 30
15 #define PREEMPT_ACTIVE (1 << PREEMPT_ACTIVE_BIT)
20 * On IA-64, we want to keep the task structure and kernel stack together, so they can be
21 * mapped by a single TLB entry and so they can be addressed by the "current" pointer
22 * without having to do pointer masking.
25 struct task_struct *task; /* XXX not really needed, except for dup_task_struct() */
26 struct exec_domain *exec_domain;/* execution domain */
27 __u32 flags; /* thread_info flags (see TIF_*) */
28 __u32 cpu; /* current CPU */
29 __u32 last_cpu; /* Last CPU thread ran on */
30 __u32 status; /* Thread synchronous flags */
31 mm_segment_t addr_limit; /* user-level address space limit */
32 int preempt_count; /* 0=premptable, <0=BUG; will also serve as bh-counter */
33 struct restart_block restart_block;
36 #define THREAD_SIZE KERNEL_STACK_SIZE
38 #define INIT_THREAD_INFO(tsk) \
41 .exec_domain = &default_exec_domain, \
44 .addr_limit = KERNEL_DS, \
47 .fn = do_no_restart_syscall, \
52 /* how to get the thread information struct from C */
53 #define current_thread_info() ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
54 #define alloc_thread_info(tsk) ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
55 #define task_thread_info(tsk) ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
57 #define current_thread_info() ((struct thread_info *) 0)
58 #define alloc_thread_info(tsk) ((struct thread_info *) 0)
59 #define task_thread_info(tsk) ((struct thread_info *) 0)
61 #define free_thread_info(ti) /* nothing */
62 #define task_stack_page(tsk) ((void *)(tsk))
64 #define __HAVE_THREAD_FUNCTIONS
65 #define setup_thread_stack(p, org) \
66 *task_thread_info(p) = *task_thread_info(org); \
67 task_thread_info(p)->task = (p);
68 #define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
70 #define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
71 #define alloc_task_struct() ((struct task_struct *)__get_free_pages(GFP_KERNEL | __GFP_COMP, KERNEL_STACK_SIZE_ORDER))
72 #define free_task_struct(tsk) free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
74 #endif /* !__ASSEMBLY */
77 * thread information flags
78 * - these are process state flags that various assembly files may need to access
79 * - pending work-to-be-done flags are in least-significant 16 bits, other flags
82 #define TIF_NOTIFY_RESUME 0 /* resumption notification requested */
83 #define TIF_SIGPENDING 1 /* signal pending */
84 #define TIF_NEED_RESCHED 2 /* rescheduling necessary */
85 #define TIF_SYSCALL_TRACE 3 /* syscall trace active */
86 #define TIF_SYSCALL_AUDIT 4 /* syscall auditing active */
87 #define TIF_POLLING_NRFLAG 16 /* true if poll_idle() is polling TIF_NEED_RESCHED */
89 #define TIF_MCA_INIT 18 /* this task is processing MCA or INIT */
90 #define TIF_DB_DISABLED 19 /* debug trap disabled for fsyscall */
92 #define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
93 #define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
94 #define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
95 #define _TIF_NOTIFY_RESUME (1 << TIF_NOTIFY_RESUME)
96 #define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
97 #define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
98 #define _TIF_POLLING_NRFLAG (1 << TIF_POLLING_NRFLAG)
99 #define _TIF_MCA_INIT (1 << TIF_MCA_INIT)
100 #define _TIF_DB_DISABLED (1 << TIF_DB_DISABLED)
102 /* "work to do on user-return" bits */
103 #define TIF_ALLWORK_MASK (_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
104 /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
105 #define TIF_WORK_MASK (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
107 #define TS_POLLING 1 /* true if in idle loop and not sleeping */
109 #define tsk_is_polling(t) ((t)->thread_info->status & TS_POLLING)
111 #endif /* _ASM_IA64_THREAD_INFO_H */