LXR linux/arch/openrisc/include/asm/thread

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 * OpenRISC Linux
   4 *
   5 * Linux architectural port borrowing liberally from similar works of
   6 * others.  All original copyrights apply as per the original source
   7 * declaration.
   8 *
   9 * OpenRISC implementation:
  10 * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
  11 * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
  12 * et al.
  13 */
  14
  15#ifndef _ASM_THREAD_INFO_H
  16#define _ASM_THREAD_INFO_H
  17
  18#ifdef __KERNEL__
  19
  20#ifndef __ASSEMBLY__
  21#include <asm/types.h>
  22#include <asm/processor.h>
  23#endif
  24
  25
  26/* THREAD_SIZE is the size of the task_struct/kernel_stack combo.
  27 * normally, the stack is found by doing something like p + THREAD_SIZE
  28 * in or1k, a page is 8192 bytes, which seems like a sane size
  29 */
  30
  31#define THREAD_SIZE_ORDER 0
  32#define THREAD_SIZE       (PAGE_SIZE << THREAD_SIZE_ORDER)
  33
  34/*
  35 * low level task data that entry.S needs immediate access to
  36 * - this struct should fit entirely inside of one cache line
  37 * - this struct shares the supervisor stack pages
  38 * - if the contents of this structure are changed, the assembly constants
  39 *   must also be changed
  40 */
  41#ifndef __ASSEMBLY__
  42
  43typedef unsigned long mm_segment_t;
  44
  45struct thread_info {
  46        struct task_struct      *task;          /* main task structure */
  47        unsigned long           flags;          /* low level flags */
  48        __u32                   cpu;            /* current CPU */
  49        __s32                   preempt_count; /* 0 => preemptable, <0 => BUG */
  50
  51        mm_segment_t            addr_limit; /* thread address space:
  52                                               0-0x7FFFFFFF for user-thead
  53                                               0-0xFFFFFFFF for kernel-thread
  54                                             */
  55        __u8                    supervisor_stack[0];
  56
  57        /* saved context data */
  58        unsigned long           ksp;
  59};
  60#endif
  61
  62/*
  63 * macros/functions for gaining access to the thread information structure
  64 *
  65 * preempt_count needs to be 1 initially, until the scheduler is functional.
  66 */
  67#ifndef __ASSEMBLY__
  68#define INIT_THREAD_INFO(tsk)                           \
  69{                                                       \
  70        .task           = &tsk,                         \
  71        .flags          = 0,                            \
  72        .cpu            = 0,                            \
  73        .preempt_count  = INIT_PREEMPT_COUNT,           \
  74        .addr_limit     = KERNEL_DS,                    \
  75        .ksp            = 0,                            \
  76}
  77
  78/* how to get the thread information struct from C */
  79register struct thread_info *current_thread_info_reg asm("r10");
  80#define current_thread_info()   (current_thread_info_reg)
  81
  82#define get_thread_info(ti) get_task_struct((ti)->task)
  83#define put_thread_info(ti) put_task_struct((ti)->task)
  84
  85#endif /* !__ASSEMBLY__ */
  86
  87/*
  88 * thread information flags
  89 *   these are process state flags that various assembly files may need to
  90 *   access
  91 *   - pending work-to-be-done flags are in LSW
  92 *   - other flags in MSW
  93 */
  94#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  95#define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  96#define TIF_SIGPENDING          2       /* signal pending */
  97#define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  98#define TIF_SINGLESTEP          4       /* restore singlestep on return to user
  99                                         * mode
 100                                         */
 101#define TIF_NOTIFY_SIGNAL       5       /* signal notifications exist */
 102#define TIF_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
 103#define TIF_RESTORE_SIGMASK     9
 104#define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling                                                * TIF_NEED_RESCHED
 105                                         */
 106#define TIF_MEMDIE              17
 107
 108#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 109#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 110#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 111#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 112#define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 113#define _TIF_NOTIFY_SIGNAL      (1<<TIF_NOTIFY_SIGNAL)
 114#define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 115
 116
 117/* Work to do when returning from interrupt/exception */
 118/* For OpenRISC, this is anything in the LSW other than syscall trace */
 119#define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))
 120
 121#endif /* __KERNEL__ */
 122
 123#endif /* _ASM_THREAD_INFO_H */
 124