arch/score/include/asm/thread_info.h

   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  */
  29 struct 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. */
  64 register 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 */