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

   1#ifndef _ASM_M32R_THREAD_INFO_H
   2#define _ASM_M32R_THREAD_INFO_H
   3
   4/* thread_info.h: m32r low-level thread information
   5 *
   6 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   7 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   8 * Copyright (C) 2004  Hirokazu Takata <takata at linux-m32r.org>
   9 */
  10
  11#ifdef __KERNEL__
  12
  13#ifndef __ASSEMBLY__
  14#include <asm/processor.h>
  15#endif
  16
  17/*
  18 * low level task data that entry.S needs immediate access to
  19 * - this struct should fit entirely inside of one cache line
  20 * - this struct shares the supervisor stack pages
  21 * - if the contents of this structure are changed, the assembly constants must also be changed
  22 */
  23#ifndef __ASSEMBLY__
  24
  25struct thread_info {
  26        struct task_struct      *task;          /* main task structure */
  27        unsigned long           flags;          /* low level flags */
  28        unsigned long           status;         /* thread-synchronous flags */
  29        __u32                   cpu;            /* current CPU */
  30        int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  31
  32        mm_segment_t            addr_limit;     /* thread address space:
  33                                                   0-0xBFFFFFFF for user-thread
  34                                                   0-0xFFFFFFFF for kernel-thread
  35                                                */
  36
  37        __u8                    supervisor_stack[0];
  38};
  39
  40#endif /* !__ASSEMBLY__ */
  41
  42#define THREAD_SIZE             (PAGE_SIZE << 1)
  43#define THREAD_SIZE_ORDER       1
  44/*
  45 * macros/functions for gaining access to the thread information structure
  46 */
  47#ifndef __ASSEMBLY__
  48
  49#define INIT_THREAD_INFO(tsk)                   \
  50{                                               \
  51        .task           = &tsk,                 \
  52        .flags          = 0,                    \
  53        .cpu            = 0,                    \
  54        .preempt_count  = INIT_PREEMPT_COUNT,   \
  55        .addr_limit     = KERNEL_DS,            \
  56}
  57
  58#define init_thread_info        (init_thread_union.thread_info)
  59#define init_stack              (init_thread_union.stack)
  60
  61/* how to get the thread information struct from C */
  62static inline struct thread_info *current_thread_info(void)
  63{
  64        struct thread_info *ti;
  65
  66        __asm__ __volatile__ (
  67                "ldi    %0, #%1                 \n\t"
  68                "and    %0, sp                  \n\t"
  69                : "=r" (ti) : "i" (~(THREAD_SIZE - 1))
  70        );
  71
  72        return ti;
  73}
  74
  75#define TI_FLAG_FAULT_CODE_SHIFT        28
  76
  77static inline void set_thread_fault_code(unsigned int val)
  78{
  79        struct thread_info *ti = current_thread_info();
  80        ti->flags = (ti->flags & (~0 >> (32 - TI_FLAG_FAULT_CODE_SHIFT)))
  81                | (val << TI_FLAG_FAULT_CODE_SHIFT);
  82}
  83
  84static inline unsigned int get_thread_fault_code(void)
  85{
  86        struct thread_info *ti = current_thread_info();
  87        return ti->flags >> TI_FLAG_FAULT_CODE_SHIFT;
  88}
  89
  90#endif
  91
  92/*
  93 * thread information flags
  94 * - these are process state flags that various assembly files may need to access
  95 * - pending work-to-be-done flags are in LSW
  96 * - other flags in MSW
  97 */
  98#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  99#define TIF_SIGPENDING          1       /* signal pending */
 100#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
 101#define TIF_SINGLESTEP          3       /* restore singlestep on return to user mode */
 102#define TIF_NOTIFY_RESUME       5       /* callback before returning to user */
 103#define TIF_RESTORE_SIGMASK     8       /* restore signal mask in do_signal() */
 104#define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
 105#define TIF_MEMDIE              18      /* is terminating due to OOM killer */
 106
 107#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
 108#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 109#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 110#define _TIF_SINGLESTEP         (1<<TIF_SINGLESTEP)
 111#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 112#define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 113
 114#define _TIF_WORK_MASK          (_TIF_SIGPENDING | _TIF_NEED_RESCHED | _TIF_NOTIFY_RESUME)
 115#define _TIF_ALLWORK_MASK       (_TIF_WORK_MASK | _TIF_SYSCALL_TRACE)
 116
 117/*
 118 * Thread-synchronous status.
 119 *
 120 * This is different from the flags in that nobody else
 121 * ever touches our thread-synchronous status, so we don't
 122 * have to worry about atomic accesses.
 123 */
 124#define TS_USEDFPU              0x0001  /* FPU was used by this task this quantum (SMP) */
 125
 126#endif /* __KERNEL__ */
 127
 128#endif /* _ASM_M32R_THREAD_INFO_H */
 129