LXR linux/arch/m32r/include/asm/thread

   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
  26struct 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#define init_thread_info        (init_thread_union.thread_info)
  60#define init_stack              (init_thread_union.stack)
  61
  62/* how to get the thread information struct from C */
  63static inline struct thread_info *current_thread_info(void)
  64{
  65        struct thread_info *ti;
  66
  67        __asm__ __volatile__ (
  68                "ldi    %0, #%1                 \n\t"
  69                "and    %0, sp                  \n\t"
  70                : "=r" (ti) : "i" (~(THREAD_SIZE - 1))
  71        );
  72
  73        return ti;
  74}
  75
  76#define TI_FLAG_FAULT_CODE_SHIFT        28
  77
  78static inline void set_thread_fault_code(unsigned int val)
  79{
  80        struct thread_info *ti = current_thread_info();
  81        ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
  82                | (val << TI_FLAG_FAULT_CODE_SHIFT);
  83}
  84
  85static inline unsigned int get_thread_fault_code(void)
  86{
  87        struct thread_info *ti = current_thread_info();
  88        return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
  89}
  90
  91#endif
  92
  93/*
  94 * thread information flags
  95 * - these are process state flags that various assembly files may need to access
  96 * - pending work-to-be-done flags are in LSW
  97 * - other flags in MSW
  98 */
  99#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
 100#define TIF_SIGPENDING          1       /* signal pending */
 101#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 102#define TIF_SINGLESTEP          3       /* restore singlestep on return to user mode */
 103#define TIF_NOTIFY_RESUME       5       /* callback before returning to user */
 104#define TIF_RESTORE_SIGMASK     8       /* restore signal mask in do_signal() */
 105#define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
 106#define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 107
 108#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 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_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 113#define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 114
 115#define _TIF_WORK_MASK          (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
 116#define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
 117
 118/*
 119 * Thread-synchronous status.
 120 *
 121 * This is different from the flags in that nobody else
 122 * ever touches our thread-synchronous status, so we don't
 123 * have to worry about atomic accesses.
 124 */
 125#define TS_USEDFPU              0x0001  /* FPU was used by this task this quantum (SMP) */
 126
 127#endif /* __KERNEL__ */
 128
 129#endif /* _ASM_M32R_THREAD_INFO_H */
 130