arch/nios2/include/asm/thread_info.h

   1 /*
   2  * NiosII low-level thread information
   3  *
   4  * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch>
   5  * Copyright (C) 2004 Microtronix Datacom Ltd.
   6  *
   7  * Based on asm/thread_info_no.h from m68k which is:
   8  *
   9  * Copyright (C) 2002 David Howells <dhowells@redhat.com>
  10  *
  11  * This file is subject to the terms and conditions of the GNU General Public
  12  * License.  See the file "COPYING" in the main directory of this archive
  13  * for more details.
  14  */
  15
  16 #ifndef _ASM_NIOS2_THREAD_INFO_H
  17 #define _ASM_NIOS2_THREAD_INFO_H
  18
  19 #ifdef __KERNEL__
  20
  21 /*
  22  * Size of the kernel stack for each process.
  23  */
  24 #define THREAD_SIZE_ORDER       1
  25 #define THREAD_SIZE             8192 /* 2 * PAGE_SIZE */
  26
  27 #ifndef __ASSEMBLY__
  28
  29 /*
  30  * low level task data that entry.S needs immediate access to
  31  * - this struct should fit entirely inside of one cache line
  32  * - this struct shares the supervisor stack pages
  33  * - if the contents of this structure are changed, the assembly constants
  34  *   must also be changed
  35  */
  36 struct thread_info {
  37         struct task_struct      *task;          /* main task structure */
  38         unsigned long           flags;          /* low level flags */
  39         __u32                   cpu;            /* current CPU */
  40         int                     preempt_count;  /* 0 => preemptable,<0 => BUG */
  41         struct pt_regs          *regs;
  42 };
  43
  44 /*
  45  * macros/functions for gaining access to the thread information structure
  46  *
  47  * preempt_count needs to be 1 initially, until the scheduler is functional.
  48  */
  49 #define INIT_THREAD_INFO(tsk)                   \
  50 {                                               \
  51         .task           = &tsk,                 \
  52         .flags          = 0,                    \
  53         .cpu            = 0,                    \
  54         .preempt_count  = INIT_PREEMPT_COUNT,   \
  55 }
  56
  57 /* how to get the thread information struct from C */
  58 static inline struct thread_info *current_thread_info(void)
  59 {
  60         register unsigned long sp asm("sp");
  61
  62         return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
  63 }
  64 #endif /* !__ASSEMBLY__ */
  65
  66 /*
  67  * thread information flags
  68  * - these are process state flags that various assembly files may need to
  69  *   access
  70  * - pending work-to-be-done flags are in LSW
  71  * - other flags in MSW
  72  */
  73 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  74 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  75 #define TIF_SIGPENDING          2       /* signal pending */
  76 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  77 #define TIF_MEMDIE              4       /* is terminating due to OOM killer */
  78 #define TIF_SECCOMP             5       /* secure computing */
  79 #define TIF_SYSCALL_AUDIT       6       /* syscall auditing active */
  80 #define TIF_NOTIFY_SIGNAL       7       /* signal notifications exist */
  81 #define TIF_RESTORE_SIGMASK     9       /* restore signal mask in do_signal() */
  82
  83 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling
  84                                            TIF_NEED_RESCHED */
  85
  86 #define _TIF_SYSCALL_TRACE      (1 << TIF_SYSCALL_TRACE)
  87 #define _TIF_NOTIFY_RESUME      (1 << TIF_NOTIFY_RESUME)
  88 #define _TIF_SIGPENDING         (1 << TIF_SIGPENDING)
  89 #define _TIF_NEED_RESCHED       (1 << TIF_NEED_RESCHED)
  90 #define _TIF_SECCOMP            (1 << TIF_SECCOMP)
  91 #define _TIF_SYSCALL_AUDIT      (1 << TIF_SYSCALL_AUDIT)
  92 #define _TIF_NOTIFY_SIGNAL      (1 << TIF_NOTIFY_SIGNAL)
  93 #define _TIF_RESTORE_SIGMASK    (1 << TIF_RESTORE_SIGMASK)
  94 #define _TIF_POLLING_NRFLAG     (1 << TIF_POLLING_NRFLAG)
  95
  96 /* work to do on interrupt/exception return */
  97 #define _TIF_WORK_MASK          0x0000FFFE
  98
  99 #endif /* __KERNEL__ */
 100
 101 #endif /* _ASM_NIOS2_THREAD_INFO_H */