arch/frv/include/asm/thread_info.h

   1 /* thread_info.h: description
   2  *
   3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
   4  * Written by David Howells (dhowells@redhat.com)
   5  * Derived from include/asm-i386/thread_info.h
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _ASM_THREAD_INFO_H
  14 #define _ASM_THREAD_INFO_H
  15
  16 #ifdef __KERNEL__
  17
  18 #ifndef __ASSEMBLY__
  19 #include <asm/processor.h>
  20 #endif
  21
  22 #define THREAD_SIZE             8192
  23
  24 #define __HAVE_ARCH_TASK_STRUCT_ALLOCATOR
  25
  26 /*
  27  * low level task data that entry.S needs immediate access to
  28  * - this struct should fit entirely inside of one cache line
  29  * - this struct shares the supervisor stack pages
  30  * - if the contents of this structure are changed, the assembly constants must also be changed
  31  */
  32 #ifndef __ASSEMBLY__
  33
  34 struct thread_info {
  35         struct task_struct      *task;          /* main task structure */
  36         struct exec_domain      *exec_domain;   /* execution domain */
  37         unsigned long           flags;          /* low level flags */
  38         unsigned long           status;         /* thread-synchronous flags */
  39         __u32                   cpu;            /* current CPU */
  40         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  41
  42         mm_segment_t            addr_limit;     /* thread address space:
  43                                                  * 0-0xBFFFFFFF for user-thead
  44                                                  * 0-0xFFFFFFFF for kernel-thread
  45                                                  */
  46         struct restart_block    restart_block;
  47
  48         __u8                    supervisor_stack[0];
  49 };
  50
  51 #else /* !__ASSEMBLY__ */
  52
  53 #include <asm/asm-offsets.h>
  54
  55 #endif
  56
  57 #define PREEMPT_ACTIVE          0x10000000
  58
  59 /*
  60  * macros/functions for gaining access to the thread information structure
  61  */
  62 #ifndef __ASSEMBLY__
  63
  64 #define INIT_THREAD_INFO(tsk)                   \
  65 {                                               \
  66         .task           = &tsk,                 \
  67         .exec_domain    = &default_exec_domain, \
  68         .flags          = 0,                    \
  69         .cpu            = 0,                    \
  70         .preempt_count  = INIT_PREEMPT_COUNT,   \
  71         .addr_limit     = KERNEL_DS,            \
  72         .restart_block = {                      \
  73                 .fn = do_no_restart_syscall,    \
  74         },                                      \
  75 }
  76
  77 #define init_thread_info        (init_thread_union.thread_info)
  78 #define init_stack              (init_thread_union.stack)
  79
  80 /* how to get the thread information struct from C */
  81 register struct thread_info *__current_thread_info asm("gr15");
  82
  83 #define current_thread_info() ({ __current_thread_info; })
  84
  85 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
  86
  87 /* thread information allocation */
  88 #ifdef CONFIG_DEBUG_STACK_USAGE
  89 #define alloc_thread_info_node(tsk, node)                       \
  90                 kzalloc_node(THREAD_SIZE, GFP_KERNEL, node)
  91 #else
  92 #define alloc_thread_info_node(tsk, node)                       \
  93                 kmalloc_node(THREAD_SIZE, GFP_KERNEL, node)
  94 #endif
  95
  96 #define free_thread_info(info)  kfree(info)
  97
  98 #endif /* __ASSEMBLY__ */
  99
 100 /*
 101  * thread information flags
 102  * - these are process state flags that various assembly files may need to access
 103  * - pending work-to-be-done flags are in LSW
 104  * - other flags in MSW
 105  */
 106 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 107 #define TIF_NOTIFY_RESUME       1       /* callback before returning to user */
 108 #define TIF_SIGPENDING          2       /* signal pending */
 109 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 110 #define TIF_SINGLESTEP          4       /* restore singlestep on return to user mode */
 111 #define TIF_RESTORE_SIGMASK     5       /* restore signal mask in do_signal() */
 112 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 113 #define TIF_MEMDIE              17      /* is terminating due to OOM killer */
 114
 115 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 116 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 117 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 118 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 119 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 120 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
 121 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 122
 123 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
 124 #define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
 125
 126 /*
 127  * Thread-synchronous status.
 128  *
 129  * This is different from the flags in that nobody else
 130  * ever touches our thread-synchronous status, so we don't
 131  * have to worry about atomic accesses.
 132  */
 133 #define TS_USEDFPM              0x0001  /* FPU/Media was used by this task this quantum (SMP) */
 134
 135 #endif /* __KERNEL__ */
 136
 137 #endif /* _ASM_THREAD_INFO_H */