LXR linux/arch/m68k/include/asm/thread

   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
   8/*
   9 * On machines with 4k pages we default to an 8k thread size, though we
  10 * allow a 4k with config option. Any other machine page size then
  11 * the thread size must match the page size (which is 8k and larger here).
  12 */
  13#if PAGE_SHIFT < 13
  14#ifdef CONFIG_4KSTACKS
  15#define THREAD_SIZE     4096
  16#else
  17#define THREAD_SIZE     8192
  18#endif
  19#else
  20#define THREAD_SIZE     PAGE_SIZE
  21#endif
  22#define THREAD_SIZE_ORDER       ((THREAD_SIZE / PAGE_SIZE) - 1)
  23
  24#ifndef __ASSEMBLY__
  25
  26struct thread_info {
  27        struct task_struct      *task;          /* main task structure */
  28        unsigned long           flags;
  29        int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  30        __u32                   cpu;            /* should always be 0 on m68k */
  31        unsigned long           tp_value;       /* thread pointer */
  32};
  33#endif /* __ASSEMBLY__ */
  34
  35#define INIT_THREAD_INFO(tsk)                   \
  36{                                               \
  37        .task           = &tsk,                 \
  38        .preempt_count  = INIT_PREEMPT_COUNT,   \
  39}
  40
  41#ifndef __ASSEMBLY__
  42/* how to get the thread information struct from C */
  43static inline struct thread_info *current_thread_info(void)
  44{
  45        struct thread_info *ti;
  46        __asm__(
  47                "move.l %%sp, %0 \n\t"
  48                "and.l  %1, %0"
  49                : "=&d"(ti)
  50                : "di" (~(THREAD_SIZE-1))
  51                );
  52        return ti;
  53}
  54#endif
  55
  56/* entry.S relies on these definitions!
  57 * bits 0-7 are tested at every exception exit
  58 * bits 8-15 are also tested at syscall exit
  59 */
  60#define TIF_NOTIFY_SIGNAL       4
  61#define TIF_NOTIFY_RESUME       5       /* callback before returning to user */
  62#define TIF_SIGPENDING          6       /* signal pending */
  63#define TIF_NEED_RESCHED        7       /* rescheduling necessary */
  64#define TIF_DELAYED_TRACE       14      /* single step a syscall */
  65#define TIF_SYSCALL_TRACE       15      /* syscall trace active */
  66#define TIF_MEMDIE              16      /* is terminating due to OOM killer */
  67#define TIF_RESTORE_SIGMASK     18      /* restore signal mask in do_signal */
  68
  69#define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
  70#define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  71#define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  72#define _TIF_DELAYED_TRACE      (1 << TIF_DELAYED_TRACE)
  73#define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  74#define _TIF_MEMDIE             (1 << TIF_MEMDIE)
  75#define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
  76
  77#endif  /* _ASM_M68K_THREAD_INFO_H */
  78