LXR linux/include/asm-ia64/thread

   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#define PREEMPT_ACTIVE_BIT 30
  15#define PREEMPT_ACTIVE  (1 << PREEMPT_ACTIVE_BIT)
  16
  17#ifndef __ASSEMBLY__
  18
  19/*
  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.
  23 */
  24struct thread_info {
  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;
  34};
  35
  36#define THREAD_SIZE                     KERNEL_STACK_SIZE
  37
  38#define INIT_THREAD_INFO(tsk)                   \
  39{                                               \
  40        .task           = &tsk,                 \
  41        .exec_domain    = &default_exec_domain, \
  42        .flags          = 0,                    \
  43        .cpu            = 0,                    \
  44        .addr_limit     = KERNEL_DS,            \
  45        .preempt_count  = 0,                    \
  46        .restart_block = {                      \
  47                .fn = do_no_restart_syscall,    \
  48        },                                      \
  49}
  50
  51#ifndef ASM_OFFSETS_C
  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))
  56#else
  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)
  60#endif
  61#define free_thread_info(ti)    /* nothing */
  62#define task_stack_page(tsk)    ((void *)(tsk))
  63
  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)
  69
  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)
  73
  74#define tsk_set_notify_resume(tsk) \
  75        set_ti_thread_flag(task_thread_info(tsk), TIF_NOTIFY_RESUME)
  76extern void tsk_clear_notify_resume(struct task_struct *tsk);
  77#endif /* !__ASSEMBLY */
  78
  79/*
  80 * thread information flags
  81 * - these are process state flags that various assembly files may need to access
  82 * - pending work-to-be-done flags are in least-significant 16 bits, other flags
  83 *   in top 16 bits
  84 */
  85#define TIF_SIGPENDING          0       /* signal pending */
  86#define TIF_NEED_RESCHED        1       /* rescheduling necessary */
  87#define TIF_SYSCALL_TRACE       2       /* syscall trace active */
  88#define TIF_SYSCALL_AUDIT       3       /* syscall auditing active */
  89#define TIF_SINGLESTEP          4       /* restore singlestep on return to user mode */
  90#define TIF_RESTORE_SIGMASK     5       /* restore signal mask in do_signal() */
  91#define TIF_NOTIFY_RESUME       6       /* resumption notification requested */
  92#define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
  93#define TIF_MEMDIE              17
  94#define TIF_MCA_INIT            18      /* this task is processing MCA or INIT */
  95#define TIF_DB_DISABLED         19      /* debug trap disabled for fsyscall */
  96#define TIF_FREEZE              20      /* is freezing for suspend */
  97#define TIF_RESTORE_RSE         21      /* user RBS is newer than kernel RBS */
  98
  99#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 100#define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
 101#define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 102#define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SINGLESTEP)
 103#define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
 104#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 105#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 106#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 107#define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 108#define _TIF_MCA_INIT           (1 << TIF_MCA_INIT)
 109#define _TIF_DB_DISABLED        (1 << TIF_DB_DISABLED)
 110#define _TIF_FREEZE             (1 << TIF_FREEZE)
 111#define _TIF_RESTORE_RSE        (1 << TIF_RESTORE_RSE)
 112
 113/* "work to do on user-return" bits */
 114#define TIF_ALLWORK_MASK        (_TIF_SIGPENDING|_TIF_NOTIFY_RESUME|_TIF_SYSCALL_AUDIT|\
 115                                 _TIF_NEED_RESCHED| _TIF_SYSCALL_TRACE|\
 116                                 _TIF_RESTORE_SIGMASK)
 117/* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
 118#define TIF_WORK_MASK           (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
 119
 120#define TS_POLLING              1       /* true if in idle loop and not sleeping */
 121
 122#define tsk_is_polling(t) (task_thread_info(t)->status & TS_POLLING)
 123
 124#endif /* _ASM_IA64_THREAD_INFO_H */
 125