include/asm-ia64/thread_info.h

   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 #include <asm/offsets.h>
   9 #include <asm/processor.h>
  10 #include <asm/ptrace.h>
  11
  12 #define PREEMPT_ACTIVE_BIT 30
  13 #define PREEMPT_ACTIVE  (1 << PREEMPT_ACTIVE_BIT)
  14
  15 #ifndef __ASSEMBLY__
  16
  17 /*
  18  * On IA-64, we want to keep the task structure and kernel stack together, so they can be
  19  * mapped by a single TLB entry and so they can be addressed by the "current" pointer
  20  * without having to do pointer masking.
  21  */
  22 struct thread_info {
  23         struct task_struct *task;       /* XXX not really needed, except for dup_task_struct() */
  24         struct exec_domain *exec_domain;/* execution domain */
  25         __u32 flags;                    /* thread_info flags (see TIF_*) */
  26         __u32 cpu;                      /* current CPU */
  27         mm_segment_t addr_limit;        /* user-level address space limit */
  28         __s32 preempt_count;            /* 0=premptable, <0=BUG; will also serve as bh-counter */
  29         struct restart_block restart_block;
  30         struct {
  31                 int signo;
  32                 int code;
  33                 void __user *addr;
  34                 unsigned long start_time;
  35                 pid_t pid;
  36         } sigdelayed;                   /* Saved information for TIF_SIGDELAYED */
  37 };
  38
  39 #define THREAD_SIZE                     KERNEL_STACK_SIZE
  40
  41 #define INIT_THREAD_INFO(tsk)                   \
  42 {                                               \
  43         .task           = &tsk,                 \
  44         .exec_domain    = &default_exec_domain, \
  45         .flags          = 0,                    \
  46         .cpu            = 0,                    \
  47         .addr_limit     = KERNEL_DS,            \
  48         .preempt_count  = 0,                    \
  49         .restart_block = {                      \
  50                 .fn = do_no_restart_syscall,    \
  51         },                                      \
  52 }
  53
  54 /* how to get the thread information struct from C */
  55 #define current_thread_info()   ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
  56 #define alloc_thread_info(tsk)  ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
  57 #define free_thread_info(ti)    /* nothing */
  58
  59 #define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
  60 #define alloc_task_struct()     ((task_t *)__get_free_pages(GFP_KERNEL, KERNEL_STACK_SIZE_ORDER))
  61 #define free_task_struct(tsk)   free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
  62
  63 #endif /* !__ASSEMBLY */
  64
  65 /*
  66  * thread information flags
  67  * - these are process state flags that various assembly files may need to access
  68  * - pending work-to-be-done flags are in least-significant 16 bits, other flags
  69  *   in top 16 bits
  70  */
  71 #define TIF_NOTIFY_RESUME       0       /* resumption notification requested */
  72 #define TIF_SIGPENDING          1       /* signal pending */
  73 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  74 #define TIF_SYSCALL_TRACE       3       /* syscall trace active */
  75 #define TIF_SYSCALL_AUDIT       4       /* syscall auditing active */
  76 #define TIF_SIGDELAYED          5       /* signal delayed from MCA/INIT/NMI/PMI context */
  77 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
  78 #define TIF_MEMDIE              17
  79
  80 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  81 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
  82 #define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
  83 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
  84 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  85 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  86 #define _TIF_SIGDELAYED (1 << TIF_SIGDELAYED)
  87 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
  88
  89 /* "work to do on user-return" bits */
  90 #define TIF_ALLWORK_MASK        (_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SIGDELAYED)
  91 /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
  92 #define TIF_WORK_MASK           (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
  93
  94 #endif /* _ASM_IA64_THREAD_INFO_H */