arch/m68k/include/asm/thread_info.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_M68K_THREAD_INFO_H
   3 #define _ASM_M68K_THREAD_INFO_H
   4
   5 #include <asm/types.h>
   6 #include <asm/page.h>
   7 #include <asm/segment.h>
   8
   9 /*
  10  * On machines with 4k pages we default to an 8k thread size, though we
  11  * allow a 4k with config option. Any other machine page size then
  12  * the thread size must match the page size (which is 8k and larger here).
  13  */
  14 #if PAGE_SHIFT < 13
  15 #ifdef CONFIG_4KSTACKS
  16 #define THREAD_SIZE     4096
  17 #else
  18 #define THREAD_SIZE     8192
  19 #endif
  20 #else
  21 #define THREAD_SIZE     PAGE_SIZE
  22 #endif
  23 #define THREAD_SIZE_ORDER       ((THREAD_SIZE / PAGE_SIZE) - 1)
  24
  25 #ifndef __ASSEMBLY__
  26
  27 struct thread_info {
  28         struct task_struct      *task;          /* main task structure */
  29         unsigned long           flags;
  30         mm_segment_t            addr_limit;     /* thread address space */
  31         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  32         __u32                   cpu;            /* should always be 0 on m68k */
  33         unsigned long           tp_value;       /* thread pointer */
  34 };
  35 #endif /* __ASSEMBLY__ */
  36
  37 #define INIT_THREAD_INFO(tsk)                   \
  38 {                                               \
  39         .task           = &tsk,                 \
  40         .addr_limit     = KERNEL_DS,            \
  41         .preempt_count  = INIT_PREEMPT_COUNT,   \
  42 }
  43
  44 #define init_stack              (init_thread_union.stack)
  45
  46 #ifndef __ASSEMBLY__
  47 /* how to get the thread information struct from C */
  48 static inline struct thread_info *current_thread_info(void)
  49 {
  50         struct thread_info *ti;
  51         __asm__(
  52                 "move.l %%sp, %0 \n\t"
  53                 "and.l  %1, %0"
  54                 : "=&d"(ti)
  55                 : "di" (~(THREAD_SIZE-1))
  56                 );
  57         return ti;
  58 }
  59 #endif
  60
  61 #define init_thread_info        (init_thread_union.thread_info)
  62
  63 /* entry.S relies on these definitions!
  64  * bits 0-7 are tested at every exception exit
  65  * bits 8-15 are also tested at syscall exit
  66  */
  67 #define TIF_NOTIFY_RESUME       5       /* callback before returning to user */
  68 #define TIF_SIGPENDING          6       /* signal pending */
  69 #define TIF_NEED_RESCHED        7       /* rescheduling necessary */
  70 #define TIF_DELAYED_TRACE       14      /* single step a syscall */
  71 #define TIF_SYSCALL_TRACE       15      /* syscall trace active */
  72 #define TIF_MEMDIE              16      /* is terminating due to OOM killer */
  73 #define TIF_RESTORE_SIGMASK     18      /* restore signal mask in do_signal */
  74
  75 #endif  /* _ASM_M68K_THREAD_INFO_H */