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        struct exec_domain      *exec_domain;   /* execution domain */
  32        unsigned long           flags;          /* low level flags */
  33        unsigned long           tp_value;       /* thread pointer */
  34        __u32                   cpu;            /* current CPU */
  35
  36        /* 0 => preemptable, < 0 => BUG */
  37        int                     preempt_count;
  38
  39        /*
  40         * thread address space:
  41         * 0-0xBFFFFFFF for user-thead
  42         * 0-0xFFFFFFFF for kernel-thread
  43         */
  44        mm_segment_t            addr_limit;
  45        struct restart_block    restart_block;
  46        struct pt_regs          *regs;
  47};
  48
  49/*
  50 * macros/functions for gaining access to the thread information structure
  51 *
  52 * preempt_count needs to be 1 initially, until the scheduler is functional.
  53 */
  54#define INIT_THREAD_INFO(tsk)                   \
  55{                                               \
  56        .task           = &tsk,                 \
  57        .exec_domain    = &default_exec_domain, \
  58        .cpu            = 0,                    \
  59        .preempt_count  = 1,                    \
  60        .addr_limit     = KERNEL_DS,            \
  61        .restart_block  = {                     \
  62                .fn = do_no_restart_syscall,    \
  63        },                                      \
  64}
  65
  66#define init_thread_info        (init_thread_union.thread_info)
  67#define init_stack              (init_thread_union.stack)
  68
  69/* How to get the thread information struct from C. */
  70register struct thread_info *__current_thread_info __asm__("r28");
  71#define current_thread_info()   __current_thread_info
  72
  73#endif /* !__ASSEMBLY__ */
  74
  75/*
  76 * thread information flags
  77 * - these are process state flags that various assembly files may need to
  78 *   access
  79 * - pending work-to-be-done flags are in LSW
  80 * - other flags in MSW
  81 */
  82#define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  83#define TIF_SIGPENDING          1       /* signal pending */
  84#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  85#define TIF_NOTIFY_RESUME       5       /* callback before returning to user */
  86#define TIF_RESTORE_SIGMASK     9       /* restore signal mask in do_signal() */
  87#define TIF_MEMDIE              18      /* is terminating due to OOM killer */
  88
  89#define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  90#define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  91#define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  92#define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  93
  94#define _TIF_WORK_MASK          (0x0000ffff)
  95
  96#endif /* __KERNEL__ */
  97
  98#endif /* _ASM_SCORE_THREAD_INFO_H */
  99