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 #else /* !__ASSEMBLY__ */
  29
  30 /* offsets into the thread_info struct for assembly code access */
  31 #define TI_TASK         0x00000000
  32 #define TI_EXEC_DOMAIN  0x00000004
  33 #define TI_FLAGS        0x00000008
  34 #define TI_CPU          0x0000000c
  35 #define TI_PRE_COUNT    0x00000010
  36 #define TI_RESTART_BLOCK 0x00000014
  37
  38 #endif
  39
  40 #define PREEMPT_ACTIVE          0x4000000
  41
  42 /*
  43  * macros/functions for gaining access to the thread information structure
  44  */
  45 #ifndef __ASSEMBLY__
  46 #define INIT_THREAD_INFO(tsk)                   \
  47 {                                               \
  48         .task           = &tsk,                 \
  49         .exec_domain    = &default_exec_domain, \
  50         .flags          = 0,                    \
  51         .cpu            = 0,                    \
  52         .preempt_count  = 1,                    \
  53         .restart_block  = {                     \
  54                 .fn = do_no_restart_syscall,    \
  55         },                                      \
  56 }
  57
  58 #define init_thread_info        (init_thread_union.thread_info)
  59 #define init_stack              (init_thread_union.stack)
  60
  61 /* how to get the thread information struct from C */
  62 static inline struct thread_info *current_thread_info(void)
  63 {
  64         struct thread_info *ti;
  65         __asm__("stc    r7_bank, %0" : "=r" (ti));
  66         return ti;
  67 }
  68
  69 /* thread information allocation */
  70 #define THREAD_SIZE (2*PAGE_SIZE)
  71 #define alloc_thread_info(ti) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
  72 #define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
  73 #define get_thread_info(ti) get_task_struct((ti)->task)
  74 #define put_thread_info(ti) put_task_struct((ti)->task)
  75
  76 #else /* !__ASSEMBLY__ */
  77
  78 /* how to get the thread information struct from ASM */
  79 #define GET_THREAD_INFO(reg) \
  80         stc     r7_bank, reg
  81
  82 #endif
  83
  84 /*
  85  * thread information flags
  86  * - these are process state flags that various assembly files may need to access
  87  * - pending work-to-be-done flags are in LSW
  88  * - other flags in MSW
  89  */
  90 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  91 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  92 #define TIF_SIGPENDING          2       /* signal pending */
  93 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  94 #define TIF_USEDFPU             16      /* FPU was used by this task this quantum (SMP) */
  95 #define TIF_POLLING_NRFLAG      17      /* true if poll_idle() is polling TIF_NEED_RESCHED */
  96 #define TIF_USERSPACE           31      /* true if FS sets userspace */
  97
  98 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  99 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
 100 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
 101 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
 102 #define _TIF_USEDFPU            (1<<TIF_USEDFPU)
 103 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
 104 #define _TIF_USERSPACE          (1<<TIF_USERSPACE)
 105
 106 #define _TIF_WORK_MASK          0x000000FE      /* work to do on interrupt/exception return */
 107 #define _TIF_ALLWORK_MASK       0x000000FF      /* work to do on any return to u-space */
 108
 109 #endif /* __KERNEL__ */
 110
 111 #endif /* __ASM_SH_THREAD_INFO_H */