include/asm-ppc/thread_info.h

   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
  13 #include <asm/processor.h>
  14
  15 #ifndef __ASSEMBLY__
  16 /*
  17  * low level task data.
  18  * If you change this, change the TI_* offsets below to match.
  19  */
  20 struct thread_info {
  21         struct task_struct      *task;          /* main task structure */
  22         struct exec_domain      *exec_domain;   /* execution domain */
  23         unsigned long           flags;          /* low level flags */
  24         int                     cpu;            /* cpu we're on */
  25         int                     preempt_count;
  26         struct restart_block    restart_block;
  27 };
  28
  29 #define INIT_THREAD_INFO(tsk)                   \
  30 {                                               \
  31         .task =         &tsk,                   \
  32         .exec_domain =  &default_exec_domain,   \
  33         .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 /*
  70  * Offsets in thread_info structure, used in assembly code
  71  */
  72 #define TI_TASK         0
  73 #define TI_EXECDOMAIN   4
  74 #define TI_FLAGS        8
  75 #define TI_CPU          12
  76 #define TI_PREEMPT      16
  77
  78 #define PREEMPT_ACTIVE          0x4000000
  79
  80 /*
  81  * thread information flag bit numbers
  82  */
  83 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  84 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  85 #define TIF_SIGPENDING          2       /* signal pending */
  86 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  87 #define TIF_POLLING_NRFLAG      4       /* true if poll_idle() is polling
  88                                            TIF_NEED_RESCHED */
  89 #define TIF_FORCE_NOERROR       5       /* don't return error from current
  90                                            syscall even if result < 0 */
  91
  92 /* as above, but as bit values */
  93 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  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_FORCE_NOERROR      (1<<TIF_FORCE_NOERROR)
  99
 100 #endif /* __KERNEL__ */
 101
 102 #endif /* _ASM_THREAD_INFO_H */