include/asm-ppc64/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 #ifndef __ASSEMBLY__
  14 #include <linux/config.h>
  15 #include <asm/processor.h>
  16 #include <asm/page.h>
  17 #include <linux/stringify.h>
  18
  19 /*
  20  * low level task data.
  21  */
  22 struct thread_info {
  23         struct task_struct *task;               /* main task structure */
  24         struct exec_domain *exec_domain;        /* execution domain */
  25         unsigned long   flags;                  /* low level flags */
  26         int             cpu;                    /* cpu we're on */
  27         int             preempt_count;
  28         struct restart_block restart_block;
  29         /* set by force_successful_syscall_return */
  30         unsigned char   syscall_noerror;
  31 };
  32
  33 /*
  34  * macros/functions for gaining access to the thread information structure
  35  *
  36  * preempt_count needs to be 1 initially, until the scheduler is functional.
  37  */
  38 #define INIT_THREAD_INFO(tsk)                   \
  39 {                                               \
  40         .task =         &tsk,                   \
  41         .exec_domain =  &default_exec_domain,   \
  42         .flags =        0,                      \
  43         .cpu =          0,                      \
  44         .preempt_count = 1,                     \
  45         .restart_block = {                      \
  46                 .fn = do_no_restart_syscall,    \
  47         },                                      \
  48 }
  49
  50 #define init_thread_info        (init_thread_union.thread_info)
  51 #define init_stack              (init_thread_union.stack)
  52
  53 /* thread information allocation */
  54
  55 #define THREAD_ORDER            2
  56 #define THREAD_SIZE             (PAGE_SIZE << THREAD_ORDER)
  57 #define THREAD_SHIFT            (PAGE_SHIFT + THREAD_ORDER)
  58 #ifdef CONFIG_DEBUG_STACK_USAGE
  59 #define alloc_thread_info(tsk)                                  \
  60         ({                                                      \
  61                 struct thread_info *ret;                        \
  62                                                                 \
  63                 ret = kmalloc(THREAD_SIZE, GFP_KERNEL);         \
  64                 if (ret)                                        \
  65                         memset(ret, 0, THREAD_SIZE);            \
  66                 ret;                                            \
  67         })
  68 #else
  69 #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
  70 #endif
  71 #define free_thread_info(ti)    kfree(ti)
  72 #define get_thread_info(ti)     get_task_struct((ti)->task)
  73 #define put_thread_info(ti)     put_task_struct((ti)->task)
  74
  75 /* how to get the thread information struct from C */
  76 static inline struct thread_info *current_thread_info(void)
  77 {
  78         struct thread_info *ti;
  79         __asm__("clrrdi %0,1,%1" : "=r"(ti) : "i" (THREAD_SHIFT));
  80         return ti;
  81 }
  82
  83 #endif /* __ASSEMBLY__ */
  84
  85 #define PREEMPT_ACTIVE          0x4000000
  86
  87 /*
  88  * thread information flag bit numbers
  89  */
  90 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  91 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  92 #define TIF_SIGPENDING          2       /* signal pending */
  93 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  94 #define TIF_POLLING_NRFLAG      4       /* true if poll_idle() is polling
  95                                            TIF_NEED_RESCHED */
  96 #define TIF_32BIT               5       /* 32 bit binary */
  97 #define TIF_RUN_LIGHT           6       /* iSeries run light */
  98 #define TIF_ABI_PENDING         7       /* 32/64 bit switch needed */
  99 #define TIF_SYSCALL_AUDIT       8       /* syscall auditing active */
 100
 101 /* as above, but as bit values */
 102 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 103 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 104 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 105 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 106 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 107 #define _TIF_32BIT              (1<<TIF_32BIT)
 108 #define _TIF_RUN_LIGHT          (1<<TIF_RUN_LIGHT)
 109 #define _TIF_ABI_PENDING        (1<<TIF_ABI_PENDING)
 110 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 111 #define _TIF_SYSCALL_T_OR_A     (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT)
 112
 113 #define _TIF_USER_WORK_MASK     (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
 114                                  _TIF_NEED_RESCHED)
 115
 116 #endif /* __KERNEL__ */
 117
 118 #endif /* _ASM_THREAD_INFO_H */