linux/include/asm-frv/thread_info.h
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   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
  32struct 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 */
  81register 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(tsk)                                  \
  90        ({                                                      \
  91                struct thread_info *ret;                        \
  92                                                                \
  93                ret = kzalloc(THREAD_SIZE, GFP_KERNEL);         \
  94                                                                \
  95                ret;                                            \
  96        })
  97#else
  98#define alloc_thread_info(tsk)  kmalloc(THREAD_SIZE, GFP_KERNEL)
  99#endif
 100
 101#define free_thread_info(info)  kfree(info)
 102
 103#endif /* __ASSEMBLY__ */
 104
 105/*
 106 * thread information flags
 107 * - these are process state flags that various assembly files may need to access
 108 * - pending work-to-be-done flags are in LSW
 109 * - other flags in MSW
 110 */
 111#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 112#define TIF_SIGPENDING          1       /* signal pending */
 113#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 114#define TIF_SINGLESTEP          3       /* restore singlestep on return to user mode */
 115#define TIF_IRET                4       /* return with iret */
 116#define TIF_RESTORE_SIGMASK     5       /* restore signal mask in do_signal() */
 117#define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
 118#define TIF_MEMDIE              17      /* OOM killer killed process */
 119#define TIF_FREEZE              18      /* freezing for suspend */
 120
 121#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
 122#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
 123#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
 124#define _TIF_SINGLESTEP         (1 << TIF_SINGLESTEP)
 125#define _TIF_IRET               (1 << TIF_IRET)
 126#define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
 127#define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
 128#define _TIF_FREEZE             (1 << TIF_FREEZE)
 129
 130#define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
 131#define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
 132
 133/*
 134 * Thread-synchronous status.
 135 *
 136 * This is different from the flags in that nobody else
 137 * ever touches our thread-synchronous status, so we don't
 138 * have to worry about atomic accesses.
 139 */
 140#define TS_USEDFPM              0x0001  /* FPU/Media was used by this task this quantum (SMP) */
 141
 142#endif /* __KERNEL__ */
 143
 144#endif /* _ASM_THREAD_INFO_H */
 145