include/asm-sh/thread_info.h

   1 #ifndef __ASM_SH_THREAD_INFO_H
   2 #define __ASM_SH_THREAD_INFO_H
   3
   4 /* SuperH version
   5  * Copyright (C) 2002  Niibe Yutaka
   6  *
   7  * The copyright of original i386 version is:
   8  *
   9  *  Copyright (C) 2002  David Howells (dhowells@redhat.com)
  10  *  - Incorporating suggestions made by Linus Torvalds and Dave Miller
  11  */
  12
  13 #ifdef __KERNEL__
  14
  15 #ifndef __ASSEMBLY__
  16 #include <asm/processor.h>
  17
  18 struct thread_info {
  19         struct task_struct      *task;          /* main task structure */
  20         struct exec_domain      *exec_domain;   /* execution domain */
  21         __u32                   flags;          /* low level flags */
  22         __u32                   cpu;
  23         __s32                   preempt_count; /* 0 => preemptable, <0 => BUG */
  24         struct restart_block    restart_block;
  25         __u8                    supervisor_stack[0];
  26 };
  27
  28 #endif
  29
  30 #define PREEMPT_ACTIVE          0x4000000
  31
  32 /*
  33  * macros/functions for gaining access to the thread information structure
  34  */
  35 #ifndef __ASSEMBLY__
  36 #define INIT_THREAD_INFO(tsk)                   \
  37 {                                               \
  38         .task           = &tsk,                 \
  39         .exec_domain    = &default_exec_domain, \
  40         .flags          = 0,                    \
  41         .cpu            = 0,                    \
  42         .preempt_count  = 1,                    \
  43         .restart_block  = {                     \
  44                 .fn = do_no_restart_syscall,    \
  45         },                                      \
  46 }
  47
  48 #define init_thread_info        (init_thread_union.thread_info)
  49 #define init_stack              (init_thread_union.stack)
  50
  51 /* how to get the thread information struct from C */
  52 static inline struct thread_info *current_thread_info(void)
  53 {
  54         struct thread_info *ti;
  55         __asm__("stc    r7_bank, %0" : "=r" (ti));
  56         return ti;
  57 }
  58
  59 /* thread information allocation */
  60 #define THREAD_SIZE (2*PAGE_SIZE)
  61 #define alloc_thread_info(ti) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
  62 #define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
  63 #define get_thread_info(ti) get_task_struct((ti)->task)
  64 #define put_thread_info(ti) put_task_struct((ti)->task)
  65
  66 #else /* !__ASSEMBLY__ */
  67
  68 /* how to get the thread information struct from ASM */
  69 #define GET_THREAD_INFO(reg) \
  70         stc     r7_bank, reg
  71
  72 #endif
  73
  74 /*
  75  * thread information flags
  76  * - these are process state flags that various assembly files may need to access
  77  * - pending work-to-be-done flags are in LSW
  78  * - other flags in MSW
  79  */
  80 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  81 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  82 #define TIF_SIGPENDING          2       /* signal pending */
  83 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  84 #define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
  85 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
  86 #define TIF_MEMDIE              18
  87 #define TIF_USERSPACE           31      /* true if FS sets userspace */
  88
  89 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  90 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  91 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  92 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  93 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
  94 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
  95 #define _TIF_USERSPACE          (1<<TIF_USERSPACE)
  96
  97 #define _TIF_WORK_MASK          0x000000FE      /* work to do on interrupt/exception return */
  98 #define _TIF_ALLWORK_MASK       0x000000FF      /* work to do on any return to u-space */
  99
 100 #endif /* __KERNEL__ */
 101
 102 #endif /* __ASM_SH_THREAD_INFO_H */