LXR linux/arch/cris/include/asm/thread

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/* thread_info.h: CRIS low-level thread information
   3 *
   4 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   5 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   6 * 
   7 * CRIS port by Axis Communications
   8 */
   9
  10#ifndef _ASM_THREAD_INFO_H
  11#define _ASM_THREAD_INFO_H
  12
  13#ifdef __KERNEL__
  14
  15#ifndef __ASSEMBLY__
  16#include <asm/types.h>
  17#include <asm/processor.h>
  18#include <arch/thread_info.h>
  19#include <asm/segment.h>
  20#endif
  21
  22
  23/*
  24 * low level task data that entry.S needs immediate access to
  25 * - this struct should fit entirely inside of one cache line
  26 * - this struct shares the supervisor stack pages
  27 * - if the contents of this structure are changed, the assembly constants must also be changed
  28 */
  29#ifndef __ASSEMBLY__
  30struct thread_info {
  31        struct task_struct      *task;          /* main task structure */
  32        unsigned long           flags;          /* low level flags */
  33        __u32                   cpu;            /* current CPU */
  34        int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  35        __u32                   tls;            /* TLS for this thread */
  36
  37        mm_segment_t            addr_limit;     /* thread address space:
  38                                                   0-0xBFFFFFFF for user-thead
  39                                                   0-0xFFFFFFFF for kernel-thread
  40                                                */
  41        __u8                    supervisor_stack[0];
  42};
  43
  44#endif
  45
  46/*
  47 * macros/functions for gaining access to the thread information structure
  48 */
  49#ifndef __ASSEMBLY__
  50#define INIT_THREAD_INFO(tsk)                           \
  51{                                                       \
  52        .task           = &tsk,                         \
  53        .flags          = 0,                            \
  54        .cpu            = 0,                            \
  55        .preempt_count  = INIT_PREEMPT_COUNT,           \
  56        .addr_limit     = KERNEL_DS,                    \
  57}
  58
  59#define init_thread_info        (init_thread_union.thread_info)
  60
  61#endif /* !__ASSEMBLY__ */
  62
  63/*
  64 * thread information flags
  65 * - these are process state flags that various assembly files may need to access
  66 * - pending work-to-be-done flags are in LSW
  67 * - other flags in MSW
  68 */
  69#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  70#define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  71#define TIF_SIGPENDING          2       /* signal pending */
  72#define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  73#define TIF_RESTORE_SIGMASK     9       /* restore signal mask in do_signal() */
  74#define TIF_MEMDIE              17      /* is terminating due to OOM killer */
  75
  76#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  77#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  78#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  79#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  80
  81#define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
  82#define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
  83
  84#endif /* __KERNEL__ */
  85
  86#endif /* _ASM_THREAD_INFO_H */
  87