include/asm-frv/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 /*
  25  * low level task data that entry.S needs immediate access to
  26  * - this struct should fit entirely inside of one cache line
  27  * - this struct shares the supervisor stack pages
  28  * - if the contents of this structure are changed, the assembly constants must also be changed
  29  */
  30 #ifndef __ASSEMBLY__
  31
  32 struct thread_info {
  33         struct task_struct      *task;          /* main task structure */
  34         struct exec_domain      *exec_domain;   /* execution domain */
  35         unsigned long           flags;          /* low level flags */
  36         unsigned long           status;         /* thread-synchronous flags */
  37         __u32                   cpu;            /* current CPU */
  38         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  39
  40         mm_segment_t            addr_limit;     /* thread address space:
  41                                                    0-0xBFFFFFFF for user-thead
  42                                                    0-0xFFFFFFFF for kernel-thread
  43                                                 */
  44         struct restart_block    restart_block;
  45
  46         __u8                    supervisor_stack[0];
  47 };
  48
  49 #else /* !__ASSEMBLY__ */
  50
  51 #include <asm/asm-offsets.h>
  52
  53 #endif
  54
  55 #define PREEMPT_ACTIVE          0x10000000
  56
  57 /*
  58  * macros/functions for gaining access to the thread information structure
  59  *
  60  * preempt_count needs to be 1 initially, until the scheduler is functional.
  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  = 1,                    \
  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 /* thread information allocation */
  86 #ifdef CONFIG_DEBUG_STACK_USAGE
  87 #define alloc_thread_info(tsk)                                  \
  88         ({                                                      \
  89                 struct thread_info *ret;                        \
  90                                                                 \
  91                 ret = kmalloc(THREAD_SIZE, GFP_KERNEL);         \
  92                 if (ret)                                        \
  93                         memset(ret, 0, THREAD_SIZE);            \
  94                 ret;                                            \
  95         })
  96 #else
  97 #define alloc_thread_info(tsk)  kmalloc(THREAD_SIZE, GFP_KERNEL)
  98 #endif
  99
 100 #define free_thread_info(info)  kfree(info)
 101
 102 #endif /* __ASSEMBLY__ */
 103
 104 /*
 105  * thread information flags
 106  * - these are process state flags that various assembly files may need to access
 107  * - pending work-to-be-done flags are in LSW
 108  * - other flags in MSW
 109  */
 110 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 111 #define TIF_SIGPENDING          1       /* signal pending */
 112 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 113 #define TIF_SINGLESTEP          3       /* restore singlestep on return to user mode */
 114 #define TIF_IRET                4       /* return with iret */
 115 #define TIF_RESTORE_SIGMASK     5       /* restore signal mask in do_signal() */
 116 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 117 #define TIF_MEMDIE              17      /* OOM killer killed process */
 118 #define TIF_FREEZE              18      /* freezing for suspend */
 119
 120 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 121 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 122 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 123 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 124 #define _TIF_IRET               (1 << TIF_IRET)
 125 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
 126 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 127 #define _TIF_FREEZE             (1 << TIF_FREEZE)
 128
 129 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
 130 #define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
 131
 132 /*
 133  * Thread-synchronous status.
 134  *
 135  * This is different from the flags in that nobody else
 136  * ever touches our thread-synchronous status, so we don't
 137  * have to worry about atomic accesses.
 138  */
 139 #define TS_USEDFPM              0x0001  /* FPU/Media was used by this task this quantum (SMP) */
 140
 141 #endif /* __KERNEL__ */
 142
 143 #endif /* _ASM_THREAD_INFO_H */