arch/m32r/include/asm/thread_info.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_M32R_THREAD_INFO_H
   3 #define _ASM_M32R_THREAD_INFO_H
   4
   5 /* thread_info.h: m32r low-level thread information
   6  *
   7  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   8  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   9  * Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
  10  */
  11
  12 #ifdef __KERNEL__
  13
  14 #ifndef __ASSEMBLY__
  15 #include <asm/processor.h>
  16 #endif
  17
  18 /*
  19  * low level task data that entry.S needs immediate access to
  20  * - this struct should fit entirely inside of one cache line
  21  * - this struct shares the supervisor stack pages
  22  * - if the contents of this structure are changed, the assembly constants must also be changed
  23  */
  24 #ifndef __ASSEMBLY__
  25
  26 struct thread_info {
  27         struct task_struct      *task;          /* main task structure */
  28         unsigned long           flags;          /* low level flags */
  29         unsigned long           status;         /* thread-synchronous flags */
  30         __u32                   cpu;            /* current CPU */
  31         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  32
  33         mm_segment_t            addr_limit;     /* thread address space:
  34                                                    0-0xBFFFFFFF for user-thread
  35                                                    0-0xFFFFFFFF for kernel-thread
  36                                                 */
  37
  38         __u8                    supervisor_stack[0];
  39 };
  40
  41 #endif /* !__ASSEMBLY__ */
  42
  43 #define THREAD_SIZE             (PAGE_SIZE << 1)
  44 #define THREAD_SIZE_ORDER       1
  45 /*
  46  * macros/functions for gaining access to the thread information structure
  47  */
  48 #ifndef __ASSEMBLY__
  49
  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 /* how to get the thread information struct from C */
  60 static inline struct thread_info *current_thread_info(void)
  61 {
  62         struct thread_info *ti;
  63
  64         __asm__ __volatile__ (
  65                 "ldi    %0, #%1                 \n\t"
  66                 "and    %0, sp                  \n\t"
  67                 : "=r" (ti) : "i" (~(THREAD_SIZE - 1))
  68         );
  69
  70         return ti;
  71 }
  72
  73 #define TI_FLAG_FAULT_CODE_SHIFT        28
  74
  75 static inline void set_thread_fault_code(unsigned int val)
  76 {
  77         struct thread_info *ti = current_thread_info();
  78         ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
  79                 | (val << TI_FLAG_FAULT_CODE_SHIFT);
  80 }
  81
  82 static inline unsigned int get_thread_fault_code(void)
  83 {
  84         struct thread_info *ti = current_thread_info();
  85         return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
  86 }
  87
  88 #endif
  89
  90 /*
  91  * thread information flags
  92  * - these are process state flags that various assembly files may need to access
  93  * - pending work-to-be-done flags are in LSW
  94  * - other flags in MSW
  95  */
  96 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  97 #define TIF_SIGPENDING          1       /* signal pending */
  98 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  99 #define TIF_SINGLESTEP          3       /* restore singlestep on return to user mode */
 100 #define TIF_NOTIFY_RESUME       5       /* callback before returning to user */
 101 #define TIF_RESTORE_SIGMASK     8       /* restore signal mask in do_signal() */
 102 #define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
 103 #define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 104
 105 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 106 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 107 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 108 #define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 109 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 110 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 111
 112 #define _TIF_WORK_MASK          (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
 113 #define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
 114
 115 /*
 116  * Thread-synchronous status.
 117  *
 118  * This is different from the flags in that nobody else
 119  * ever touches our thread-synchronous status, so we don't
 120  * have to worry about atomic accesses.
 121  */
 122 #define TS_USEDFPU              0x0001  /* FPU was used by this task this quantum (SMP) */
 123
 124 #endif /* __KERNEL__ */
 125
 126 #endif /* _ASM_M32R_THREAD_INFO_H */