arch/openrisc/include/asm/thread_info.h

   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 or32, 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
  43 typedef unsigned long mm_segment_t;
  44
  45 struct 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 */
  79 register 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_SYSCALL_TRACEPOINT  8       /* for ftrace syscall instrumentation */
 102 #define TIF_RESTORE_SIGMASK     9
 103 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling                                                * TIF_NEED_RESCHED
 104                                          */
 105 #define TIF_MEMDIE              17
 106
 107 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 108 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 109 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 110 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 111 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 112 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 113
 114
 115 /* Work to do when returning from interrupt/exception */
 116 /* For OpenRISC, this is anything in the LSW other than syscall trace */
 117 #define _TIF_WORK_MASK (0xff & ~(_TIF_SYSCALL_TRACE|_TIF_SINGLESTEP))
 118
 119 #endif /* __KERNEL__ */
 120
 121 #endif /* _ASM_THREAD_INFO_H */