include/asm-v850/thread_info.h

   1 /*
   2  * include/asm-v850/thread_info.h -- v850 low-level thread information
   3  *
   4  *  Copyright (C) 2002  NEC Corporation
   5  *  Copyright (C) 2002  Miles Bader <miles@gnu.org>
   6  *  Copyright (C) 2002  David Howells (dhowells@redhat.com)
   7  *    - Incorporating suggestions made by Linus Torvalds and Dave Miller
   8  *
   9  * This file is subject to the terms and conditions of the GNU General
  10  * Public License.  See the file COPYING in the main directory of this
  11  * archive for more details.
  12  *
  13  * This file was derived from the PPC version, include/asm-ppc/thread_info.h
  14  * which was adapted from the i386 version by Paul Mackerras
  15  */
  16
  17 #ifndef __V850_THREAD_INFO_H__
  18 #define __V850_THREAD_INFO_H__
  19
  20 #ifdef __KERNEL__
  21
  22 #ifndef __ASSEMBLY__
  23
  24 /*
  25  * low level task data.
  26  * If you change this, change the TI_* offsets below to match.
  27  */
  28 struct thread_info {
  29         struct task_struct      *task;          /* main task structure */
  30         struct exec_domain      *exec_domain;   /* execution domain */
  31         unsigned long           flags;          /* low level flags */
  32         int                     cpu;            /* cpu we're on */
  33         int                     preempt_count;  /* 0 => preemptable,
  34                                                    <0 => BUG */
  35         struct restart_block    restart_block;
  36 };
  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 /*
  54  * macros/functions for gaining access to the thread information structure
  55  */
  56
  57 /* thread information allocation */
  58 #define alloc_thread_info(tsk) ((struct thread_info *) \
  59                                 __get_free_pages(GFP_KERNEL, 1))
  60 #define free_thread_info(ti)    free_pages((unsigned long) (ti), 1)
  61
  62 #endif /* __ASSEMBLY__ */
  63
  64
  65 /*
  66  * Offsets in thread_info structure, used in assembly code
  67  */
  68 #define TI_TASK         0
  69 #define TI_EXECDOMAIN   4
  70 #define TI_FLAGS        8
  71 #define TI_CPU          12
  72 #define TI_PREEMPT      16
  73
  74 #define PREEMPT_ACTIVE          0x4000000
  75
  76 /*
  77  * thread information flag bit numbers
  78  */
  79 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  80 #define TIF_SIGPENDING          1       /* signal pending */
  81 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  82 #define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
  83                                            TIF_NEED_RESCHED */
  84 #define TIF_MEMDIE              4
  85
  86 /* as above, but as bit values */
  87 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  88 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  89 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  90 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
  91
  92
  93 /* Size of kernel stack for each process.  */
  94 #define THREAD_SIZE             0x2000
  95
  96 /* The alignment of kernel threads, with thread_info structures at their
  97    base.  Thus, a pointer for a task's task structure can be derived from
  98    its kernel stack pointer.  */
  99 #define THREAD_ALIGNMENT        THREAD_SIZE
 100 #define THREAD_MASK             (-THREAD_ALIGNMENT)
 101
 102
 103 #ifdef __ASSEMBLY__
 104
 105 /* Put a pointer to the current thread_info structure into REG.  Note that
 106    this definition requires THREAD_MASK to be representable as a signed
 107    16-bit value.  */
 108 #define GET_CURRENT_THREAD(reg)                                         \
 109         /* Use `addi' and then `and' instead of just `andi', because    \
 110            `addi' sign-extends the immediate value, whereas `andi'      \
 111            zero-extends it.  */                                         \
 112         addi    THREAD_MASK, r0, reg;                                   \
 113         and     sp, reg
 114
 115 #else
 116
 117 /* Return a pointer to the current thread_info structure.  */
 118 static inline struct thread_info *current_thread_info (void)
 119 {
 120         register unsigned long sp __asm__ ("sp");
 121         return (struct thread_info *)(sp & THREAD_MASK);
 122 }
 123
 124 #endif /* __ASSEMBLY__ */
 125
 126
 127 #endif /* __KERNEL__ */
 128
 129 #endif /* __V850_THREAD_INFO_H__ */