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 #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  */
  24 struct 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         mm_segment_t addr_limit;        /* user-level address space limit */
  31         int preempt_count;              /* 0=premptable, <0=BUG; will also serve as bh-counter */
  32         struct restart_block restart_block;
  33 };
  34
  35 #define THREAD_SIZE                     KERNEL_STACK_SIZE
  36
  37 #define INIT_THREAD_INFO(tsk)                   \
  38 {                                               \
  39         .task           = &tsk,                 \
  40         .exec_domain    = &default_exec_domain, \
  41         .flags          = 0,                    \
  42         .cpu            = 0,                    \
  43         .addr_limit     = KERNEL_DS,            \
  44         .preempt_count  = 0,                    \
  45         .restart_block = {                      \
  46                 .fn = do_no_restart_syscall,    \
  47         },                                      \
  48 }
  49
  50 #ifndef ASM_OFFSETS_C
  51 /* how to get the thread information struct from C */
  52 #define current_thread_info()   ((struct thread_info *) ((char *) current + IA64_TASK_SIZE))
  53 #define alloc_thread_info(tsk)  ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
  54 #define task_thread_info(tsk)   ((struct thread_info *) ((char *) (tsk) + IA64_TASK_SIZE))
  55 #else
  56 #define current_thread_info()   ((struct thread_info *) 0)
  57 #define alloc_thread_info(tsk)  ((struct thread_info *) 0)
  58 #define task_thread_info(tsk)   ((struct thread_info *) 0)
  59 #endif
  60 #define free_thread_info(ti)    /* nothing */
  61 #define task_stack_page(tsk)    ((void *)(tsk))
  62
  63 #define __HAVE_THREAD_FUNCTIONS
  64 #define setup_thread_stack(p, org) \
  65         *task_thread_info(p) = *task_thread_info(org); \
  66         task_thread_info(p)->task = (p);
  67 #define end_of_stack(p) (unsigned long *)((void *)(p) + IA64_RBS_OFFSET)
  68
  69 #define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
  70 #define alloc_task_struct()     ((task_t *)__get_free_pages(GFP_KERNEL | __GFP_COMP, KERNEL_STACK_SIZE_ORDER))
  71 #define free_task_struct(tsk)   free_pages((unsigned long) (tsk), KERNEL_STACK_SIZE_ORDER)
  72
  73 #endif /* !__ASSEMBLY */
  74
  75 /*
  76  * thread information flags
  77  * - these are process state flags that various assembly files may need to access
  78  * - pending work-to-be-done flags are in least-significant 16 bits, other flags
  79  *   in top 16 bits
  80  */
  81 #define TIF_NOTIFY_RESUME       0       /* resumption notification requested */
  82 #define TIF_SIGPENDING          1       /* signal pending */
  83 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  84 #define TIF_SYSCALL_TRACE       3       /* syscall trace active */
  85 #define TIF_SYSCALL_AUDIT       4       /* syscall auditing active */
  86 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
  87 #define TIF_MEMDIE              17
  88 #define TIF_MCA_INIT            18      /* this task is processing MCA or INIT */
  89 #define TIF_DB_DISABLED         19      /* debug trap disabled for fsyscall */
  90
  91 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  92 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
  93 #define _TIF_SYSCALL_TRACEAUDIT (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
  94 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
  95 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  96 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  97 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
  98 #define _TIF_MCA_INIT           (1 << TIF_MCA_INIT)
  99 #define _TIF_DB_DISABLED        (1 << TIF_DB_DISABLED)
 100
 101 /* "work to do on user-return" bits */
 102 #define TIF_ALLWORK_MASK        (_TIF_NOTIFY_RESUME|_TIF_SIGPENDING|_TIF_NEED_RESCHED|_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
 103 /* like TIF_ALLWORK_BITS but sans TIF_SYSCALL_TRACE or TIF_SYSCALL_AUDIT */
 104 #define TIF_WORK_MASK           (TIF_ALLWORK_MASK&~(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT))
 105
 106 #endif /* _ASM_IA64_THREAD_INFO_H */