include/asm-nios2nommu/thread_info.h

   1 /* thread_info.h: niosnommu low-level thread information
   2  * adapted from the m68knommu
   3  *
   4  * Copyright (C) 2004 Microtronix Datacom Ltd.
   5  * Copyright (C) 2002 Microtronix Datacom
   6  *
   7  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   8  *
   9  * All rights reserved.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful, but
  17  * WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  19  * NON INFRINGEMENT.  See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  25  *
  26  */
  27
  28 #ifndef _ASM_THREAD_INFO_H
  29 #define _ASM_THREAD_INFO_H
  30
  31 #include <asm/page.h>
  32
  33 #ifdef __KERNEL__
  34
  35 #ifndef __ASSEMBLY__
  36
  37 /*
  38  * low level task data.
  39  */
  40 struct thread_info {
  41         struct task_struct *task;               /* main task structure */
  42         struct exec_domain *exec_domain;        /* execution domain */
  43         unsigned long      flags;               /* low level flags */
  44         int                cpu;                 /* cpu we're on */
  45         int                preempt_count;       /* 0 => preemptable, <0 => BUG*/
  46         struct restart_block restart_block;
  47 };
  48
  49 /*
  50  * macros/functions for gaining access to the thread information structure
  51  */
  52 #define INIT_THREAD_INFO(tsk)                   \
  53 {                                               \
  54         .task           = &tsk,                 \
  55         .exec_domain    = &default_exec_domain, \
  56         .flags          = 0,                    \
  57         .cpu            = 0,                    \
  58         .preempt_count  = 1,                    \
  59         .restart_block  = {                     \
  60                 .fn = do_no_restart_syscall,    \
  61         },                                      \
  62 }
  63
  64 #define init_thread_info        (init_thread_union.thread_info)
  65 #define init_stack              (init_thread_union.stack)
  66
  67
  68 /* how to get the thread information struct from C
  69    usable only in supervisor mode */
  70 static inline struct thread_info *current_thread_info(void)
  71 {
  72         struct thread_info *ti;
  73         __asm__ __volatile__(
  74                 "mov    %0, sp\n"
  75                 "and    %0, %0, %1\n"
  76                 : "=&r"(ti)
  77                 : "r" (~(THREAD_SIZE-1))
  78                 );
  79         return ti;
  80 }
  81
  82 /* thread information allocation */
  83 #define alloc_thread_info(tsk) ((struct thread_info *) \
  84                                 __get_free_pages(GFP_KERNEL, 1))
  85 #define free_thread_info(ti)    free_pages((unsigned long) (ti), 1)
  86 #define put_thread_info(ti)     put_task_struct((ti)->task)
  87
  88 #define PREEMPT_ACTIVE  0x4000000
  89
  90 /*
  91  * thread information flag bit numbers
  92  */
  93 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  94 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  95 #define TIF_SIGPENDING          2       /* signal pending */
  96 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  97 #define TIF_POLLING_NRFLAG      4       /* true if poll_idle() is polling
  98                                            TIF_NEED_RESCHED */
  99 #define TIF_MEMDIE              5
 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
 108 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
 109
 110 #else /* __ASSEMBLY__ */
 111
 112 /* how to get the thread information struct from ASM
 113    usable only in supervisor mode */
 114 .macro GET_THREAD_INFO reg
 115 .if THREAD_SIZE & 0xffff0000
 116         andhi   \reg, sp, %hi(~(THREAD_SIZE-1))
 117 .else
 118         addi    \reg, r0, %lo(~(THREAD_SIZE-1))
 119         and     \reg, \reg, sp
 120 .endif
 121 .endm
 122
 123 #endif /* __ASSEMBLY__ */
 124
 125 #endif /* __KERNEL__ */
 126
 127 #endif /* _ASM_THREAD_INFO_H */