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   1 /* thread_info.h: PPC low-level thread information
   2  * adapted from the i386 version by Paul Mackerras
   3  *
   4  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   5  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   6  */
   7
   8 #ifndef _ASM_THREAD_INFO_H
   9 #define _ASM_THREAD_INFO_H
  10
  11 #ifdef __KERNEL__
  12 #ifndef __ASSEMBLY__
  13 /*
  14  * low level task data.
  15  * If you change this, change the TI_* offsets below to match.
  16  */
  17 struct thread_info {
  18         struct task_struct      *task;          /* main task structure */
  19         struct exec_domain      *exec_domain;   /* execution domain */
  20         unsigned long           flags;          /* low level flags */
  21         unsigned long           local_flags;    /* non-racy flags */
  22         int                     cpu;            /* cpu we're on */
  23         int                     preempt_count;  /* 0 => preemptable,
  24                                                    <0 => BUG */
  25         struct restart_block    restart_block;
  26 };
  27
  28 #define INIT_THREAD_INFO(tsk)                   \
  29 {                                               \
  30         .task =         &tsk,                   \
  31         .exec_domain =  &default_exec_domain,   \
  32         .flags =        0,                      \
  33         .local_flags =  0,                      \
  34         .cpu =          0,                      \
  35         .preempt_count = 1,                     \
  36         .restart_block = {                      \
  37                 .fn = do_no_restart_syscall,    \
  38         },                                      \
  39 }
  40
  41 #define init_thread_info        (init_thread_union.thread_info)
  42 #define init_stack              (init_thread_union.stack)
  43
  44 /*
  45  * macros/functions for gaining access to the thread information structure
  46  */
  47
  48 /* how to get the thread information struct from C */
  49 static inline struct thread_info *current_thread_info(void)
  50 {
  51         struct thread_info *ti;
  52         __asm__("rlwinm %0,1,0,0,18" : "=r"(ti));
  53         return ti;
  54 }
  55
  56 /* thread information allocation */
  57 #define alloc_thread_info(tsk) ((struct thread_info *) \
  58                                 __get_free_pages(GFP_KERNEL, 1))
  59 #define free_thread_info(ti)    free_pages((unsigned long) (ti), 1)
  60 #define get_thread_info(ti)     get_task_struct((ti)->task)
  61 #define put_thread_info(ti)     put_task_struct((ti)->task)
  62 #endif /* __ASSEMBLY__ */
  63
  64 /*
  65  * Size of kernel stack for each process.
  66  */
  67 #define THREAD_SIZE             8192    /* 2 pages */
  68
  69 #define PREEMPT_ACTIVE          0x10000000
  70
  71 /*
  72  * thread information flag bit numbers
  73  */
  74 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  75 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  76 #define TIF_SIGPENDING          2       /* signal pending */
  77 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  78 #define TIF_POLLING_NRFLAG      4       /* true if poll_idle() is polling
  79                                            TIF_NEED_RESCHED */
  80 #define TIF_MEMDIE              5
  81 #define TIF_SYSCALL_AUDIT       6       /* syscall auditing active */
  82 #define TIF_SECCOMP             7      /* secure computing */
  83
  84 /* as above, but as bit values */
  85 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  86 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  87 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  88 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  89 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
  90 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
  91 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
  92
  93 #define _TIF_SYSCALL_T_OR_A     (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
  94
  95 /*
  96  * Non racy (local) flags bit numbers
  97  */
  98 #define TIFL_FORCE_NOERROR      0       /* don't return error from current
  99                                            syscall even if result < 0 */
 100
 101 /* as above, but as bit values */
 102 #define _TIFL_FORCE_NOERROR     (1<<TIFL_FORCE_NOERROR)
 103
 104
 105 #endif /* __KERNEL__ */
 106
 107 #endif /* _ASM_THREAD_INFO_H */