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#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
  27struct 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#ifndef __ASSEMBLY__
  45/* how to get the thread information struct from C */
  46static inline struct thread_info *current_thread_info(void)
  47{
  48        struct thread_info *ti;
  49        __asm__(
  50                "move.l %%sp, %0 \n\t"
  51                "and.l  %1, %0"
  52                : "=&d"(ti)
  53                : "di" (~(THREAD_SIZE-1))
  54                );
  55        return ti;
  56}
  57#endif
  58
  59/* entry.S relies on these definitions!
  60 * bits 0-7 are tested at every exception exit
  61 * bits 8-15 are also tested at syscall exit
  62 */
  63#define TIF_NOTIFY_RESUME       5       /* callback before returning to user */
  64#define TIF_SIGPENDING          6       /* signal pending */
  65#define TIF_NEED_RESCHED        7       /* rescheduling necessary */
  66#define TIF_DELAYED_TRACE       14      /* single step a syscall */
  67#define TIF_SYSCALL_TRACE       15      /* syscall trace active */
  68#define TIF_MEMDIE              16      /* is terminating due to OOM killer */
  69#define TIF_RESTORE_SIGMASK     18      /* restore signal mask in do_signal */
  70
  71#endif  /* _ASM_M68K_THREAD_INFO_H */
  72