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 /*
  23  * low level task data that entry.S needs immediate access to
  24  * - this struct should fit entirely inside of one cache line
  25  * - this struct shares the supervisor stack pages
  26  * - if the contents of this structure are changed, the assembly constants must also be changed
  27  */
  28 #ifndef __ASSEMBLY__
  29
  30 struct thread_info {
  31         struct task_struct      *task;          /* main task structure */
  32         struct exec_domain      *exec_domain;   /* execution domain */
  33         unsigned long           flags;          /* low level flags */
  34         unsigned long           status;         /* thread-synchronous flags */
  35         __u32                   cpu;            /* current CPU */
  36         __s32                   preempt_count;  /* 0 => preemptable, <0 => BUG */
  37
  38         mm_segment_t            addr_limit;     /* thread address space:
  39                                                    0-0xBFFFFFFF for user-thead
  40                                                    0-0xFFFFFFFF for kernel-thread
  41                                                 */
  42         struct restart_block    restart_block;
  43
  44         __u8                    supervisor_stack[0];
  45 };
  46
  47 #else /* !__ASSEMBLY__ */
  48
  49 /* offsets into the thread_info struct for assembly code access */
  50 #define TI_TASK                 0x00000000
  51 #define TI_EXEC_DOMAIN          0x00000004
  52 #define TI_FLAGS                0x00000008
  53 #define TI_STATUS               0x0000000C
  54 #define TI_CPU                  0x00000010
  55 #define TI_PRE_COUNT            0x00000014
  56 #define TI_ADDR_LIMIT           0x00000018
  57 #define TI_RESTART_BLOCK        0x0000001C
  58
  59 #endif
  60
  61 #define PREEMPT_ACTIVE          0x4000000
  62
  63 /*
  64  * macros/functions for gaining access to the thread information structure
  65  *
  66  * preempt_count needs to be 1 initially, until the scheduler is functional.
  67  */
  68 #ifndef __ASSEMBLY__
  69
  70 #define INIT_THREAD_INFO(tsk)                   \
  71 {                                               \
  72         .task           = &tsk,                 \
  73         .exec_domain    = &default_exec_domain, \
  74         .flags          = 0,                    \
  75         .cpu            = 0,                    \
  76         .preempt_count  = 1,                    \
  77         .addr_limit     = KERNEL_DS,            \
  78         .restart_block = {                      \
  79                 .fn = do_no_restart_syscall,    \
  80         },                                      \
  81 }
  82
  83 #define init_thread_info        (init_thread_union.thread_info)
  84 #define init_stack              (init_thread_union.stack)
  85
  86 #ifdef CONFIG_SMALL_TASKS
  87 #define THREAD_SIZE             4096
  88 #else
  89 #define THREAD_SIZE             8192
  90 #endif
  91
  92 /* how to get the thread information struct from C */
  93 register struct thread_info *__current_thread_info asm("gr15");
  94
  95 #define current_thread_info() ({ __current_thread_info; })
  96
  97 /* thread information allocation */
  98 #ifdef CONFIG_DEBUG_STACK_USAGE
  99 #define alloc_thread_info(tsk)                                  \
 100         ({                                                      \
 101                 struct thread_info *ret;                        \
 102                                                                 \
 103                 ret = kmalloc(THREAD_SIZE, GFP_KERNEL);         \
 104                 if (ret)                                        \
 105                         memset(ret, 0, THREAD_SIZE);            \
 106                 ret;                                            \
 107         })
 108 #else
 109 #define alloc_thread_info(tsk)  kmalloc(THREAD_SIZE, GFP_KERNEL)
 110 #endif
 111
 112 #define free_thread_info(info)  kfree(info)
 113 #define get_thread_info(ti)     get_task_struct((ti)->task)
 114 #define put_thread_info(ti)     put_task_struct((ti)->task)
 115
 116 #else /* !__ASSEMBLY__ */
 117
 118 #define THREAD_SIZE     8192
 119
 120 #endif
 121
 122 /*
 123  * thread information flags
 124  * - these are process state flags that various assembly files may need to access
 125  * - pending work-to-be-done flags are in LSW
 126  * - other flags in MSW
 127  */
 128 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 129 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
 130 #define TIF_SIGPENDING          2       /* signal pending */
 131 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
 132 #define TIF_SINGLESTEP          4       /* restore singlestep on return to user mode */
 133 #define TIF_IRET                5       /* return with iret */
 134 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 135 #define TIF_MEMDIE              17      /* OOM killer killed process */
 136
 137 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 138 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
 139 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 140 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 141 #define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 142 #define _TIF_IRET               (1 << TIF_IRET)
 143 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 144
 145 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
 146 #define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
 147
 148 /*
 149  * Thread-synchronous status.
 150  *
 151  * This is different from the flags in that nobody else
 152  * ever touches our thread-synchronous status, so we don't
 153  * have to worry about atomic accesses.
 154  */
 155 #define TS_USEDFPM              0x0001  /* FPU/Media was used by this task this quantum (SMP) */
 156
 157 #endif /* __KERNEL__ */
 158
 159 #endif /* _ASM_THREAD_INFO_H */