LXR linux/arch/score/include/asm/thread

   1#ifndef _ASM_SCORE_THREAD_INFO_H
   2#define _ASM_SCORE_THREAD_INFO_H
   3
   4#ifdef __KERNEL__
   5
   6#define KU_MASK 0x08
   7#define KU_USER 0x08
   8#define KU_KERN 0x00
   9
  10#include <asm/page.h>
  11#include <linux/const.h>
  12
  13/* thread information allocation */
  14#define THREAD_SIZE_ORDER       (1)
  15#define THREAD_SIZE             (PAGE_SIZE << THREAD_SIZE_ORDER)
  16#define THREAD_MASK             (THREAD_SIZE - _AC(1,UL))
  17
  18#ifndef __ASSEMBLY__
  19
  20#include <asm/processor.h>
  21
  22/*
  23 * low level task data that entry.S needs immediate access to
  24 * - this struct should fit entirely inside of one cache line
  25 * - this struct shares the supervisor stack pages
  26 * - if the contents of this structure are changed, the assembly constants
  27 *   must also be changed
  28 */
  29struct thread_info {
  30        struct task_struct      *task;          /* main task structure */
  31        unsigned long           flags;          /* low level flags */
  32        unsigned long           tp_value;       /* thread pointer */
  33        __u32                   cpu;            /* current CPU */
  34
  35        /* 0 => preemptable, < 0 => BUG */
  36        int                     preempt_count;
  37
  38        /*
  39         * thread address space:
  40         * 0-0xBFFFFFFF for user-thead
  41         * 0-0xFFFFFFFF for kernel-thread
  42         */
  43        mm_segment_t            addr_limit;
  44        struct pt_regs          *regs;
  45};
  46
  47/*
  48 * macros/functions for gaining access to the thread information structure
  49 *
  50 * preempt_count needs to be 1 initially, until the scheduler is functional.
  51 */
  52#define INIT_THREAD_INFO(tsk)                   \
  53{                                               \
  54        .task           = &tsk,                 \
  55        .cpu            = 0,                    \
  56        .preempt_count  = 1,                    \
  57        .addr_limit     = KERNEL_DS,            \
  58}
  59
  60#define init_thread_info        (init_thread_union.thread_info)
  61#define init_stack              (init_thread_union.stack)
  62
  63/* How to get the thread information struct from C. */
  64register struct thread_info *__current_thread_info __asm__("r28");
  65#define current_thread_info()   __current_thread_info
  66
  67#endif /* !__ASSEMBLY__ */
  68
  69/*
  70 * thread information flags
  71 * - these are process state flags that various assembly files may need to
  72 *   access
  73 * - pending work-to-be-done flags are in LSW
  74 * - other flags in MSW
  75 */
  76#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  77#define TIF_SIGPENDING          1       /* signal pending */
  78#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  79#define TIF_NOTIFY_RESUME       5       /* callback before returning to user */
  80#define TIF_RESTORE_SIGMASK     9       /* restore signal mask in do_signal() */
  81#define TIF_MEMDIE              18      /* is terminating due to OOM killer */
  82
  83#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  84#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  85#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  86#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  87
  88#define _TIF_WORK_MASK          (0x0000ffff)
  89
  90#endif /* __KERNEL__ */
  91
  92#endif /* _ASM_SCORE_THREAD_INFO_H */
  93