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 <linux/cache.h>
  16 #include <asm/processor.h>
  17 #include <asm/page.h>
  18 #include <linux/stringify.h>
  19
  20 /*
  21  * low level task data.
  22  */
  23 struct thread_info {
  24         struct task_struct *task;               /* main task structure */
  25         struct exec_domain *exec_domain;        /* execution domain */
  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         /* low level flags - has atomic operations done on it */
  32         unsigned long   flags ____cacheline_aligned_in_smp;
  33 };
  34
  35 /*
  36  * macros/functions for gaining access to the thread information structure
  37  *
  38  * preempt_count needs to be 1 initially, until the scheduler is functional.
  39  */
  40 #define INIT_THREAD_INFO(tsk)                   \
  41 {                                               \
  42         .task =         &tsk,                   \
  43         .exec_domain =  &default_exec_domain,   \
  44         .cpu =          0,                      \
  45         .preempt_count = 1,                     \
  46         .restart_block = {                      \
  47                 .fn = do_no_restart_syscall,    \
  48         },                                      \
  49         .flags =        0,                      \
  50 }
  51
  52 #define init_thread_info        (init_thread_union.thread_info)
  53 #define init_stack              (init_thread_union.stack)
  54
  55 /* thread information allocation */
  56
  57 #define THREAD_ORDER            2
  58 #define THREAD_SIZE             (PAGE_SIZE << THREAD_ORDER)
  59 #define THREAD_SHIFT            (PAGE_SHIFT + THREAD_ORDER)
  60 #ifdef CONFIG_DEBUG_STACK_USAGE
  61 #define alloc_thread_info(tsk)                                  \
  62         ({                                                      \
  63                 struct thread_info *ret;                        \
  64                                                                 \
  65                 ret = kmalloc(THREAD_SIZE, GFP_KERNEL);         \
  66                 if (ret)                                        \
  67                         memset(ret, 0, THREAD_SIZE);            \
  68                 ret;                                            \
  69         })
  70 #else
  71 #define alloc_thread_info(tsk) kmalloc(THREAD_SIZE, GFP_KERNEL)
  72 #endif
  73 #define free_thread_info(ti)    kfree(ti)
  74 #define get_thread_info(ti)     get_task_struct((ti)->task)
  75 #define put_thread_info(ti)     put_task_struct((ti)->task)
  76
  77 /* how to get the thread information struct from C */
  78 static inline struct thread_info *current_thread_info(void)
  79 {
  80         struct thread_info *ti;
  81         __asm__("clrrdi %0,1,%1" : "=r"(ti) : "i" (THREAD_SHIFT));
  82         return ti;
  83 }
  84
  85 #endif /* __ASSEMBLY__ */
  86
  87 #define PREEMPT_ACTIVE          0x10000000
  88
  89 /*
  90  * thread information flag bit numbers
  91  */
  92 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  93 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  94 #define TIF_SIGPENDING          2       /* signal pending */
  95 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  96 #define TIF_POLLING_NRFLAG      4       /* true if poll_idle() is polling
  97                                            TIF_NEED_RESCHED */
  98 #define TIF_32BIT               5       /* 32 bit binary */
  99 /* #define SPARE                6 */
 100 #define TIF_ABI_PENDING         7       /* 32/64 bit switch needed */
 101 #define TIF_SYSCALL_AUDIT       8       /* syscall auditing active */
 102 #define TIF_SINGLESTEP          9       /* singlestepping active */
 103 #define TIF_MEMDIE              10
 104 #define TIF_SECCOMP             11      /* secure computing */
 105
 106 /* as above, but as bit values */
 107 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 108 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 109 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 110 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 111 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 112 #define _TIF_32BIT              (1<<TIF_32BIT)
 113 /* #define _SPARE               (1<<SPARE) */
 114 #define _TIF_ABI_PENDING        (1<<TIF_ABI_PENDING)
 115 #define _TIF_SYSCALL_AUDIT      (1<<TIF_SYSCALL_AUDIT)
 116 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 117 #define _TIF_SECCOMP            (1<<TIF_SECCOMP)
 118 #define _TIF_SYSCALL_T_OR_A     (_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP)
 119
 120 #define _TIF_USER_WORK_MASK     (_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | \
 121                                  _TIF_NEED_RESCHED)
 122
 123 #endif /* __KERNEL__ */
 124
 125 #endif /* _ASM_THREAD_INFO_H */