include/asm-sh64/thread_info.h

   1 #ifndef __ASM_SH64_THREAD_INFO_H
   2 #define __ASM_SH64_THREAD_INFO_H
   3
   4 /*
   5  * SuperH 5 version
   6  * Copyright (C) 2003  Paul Mundt
   7  */
   8
   9 #ifdef __KERNEL__
  10
  11 #ifndef __ASSEMBLY__
  12 #include <asm/registers.h>
  13
  14 /*
  15  * low level task data that entry.S needs immediate access to
  16  * - this struct should fit entirely inside of one cache line
  17  * - this struct shares the supervisor stack pages
  18  * - if the contents of this structure are changed, the assembly constants must also be changed
  19  */
  20 struct thread_info {
  21         struct task_struct      *task;          /* main task structure */
  22         struct exec_domain      *exec_domain;   /* execution domain */
  23         unsigned long           flags;          /* low level flags */
  24         /* Put the 4 32-bit fields together to make asm offsetting easier. */
  25         __s32                   preempt_count; /* 0 => preemptable, <0 => BUG */
  26         __u16                   cpu;
  27
  28         mm_segment_t            addr_limit;
  29         struct restart_block    restart_block;
  30
  31         __u8                    supervisor_stack[0];
  32 };
  33
  34 /*
  35  * macros/functions for gaining access to the thread information structure
  36  */
  37 #define INIT_THREAD_INFO(tsk)                   \
  38 {                                               \
  39         .task           = &tsk,                 \
  40         .exec_domain    = &default_exec_domain, \
  41         .flags          = 0,                    \
  42         .cpu            = 0,                    \
  43         .preempt_count  = 1,                    \
  44         .addr_limit     = KERNEL_DS,            \
  45         .restart_block  = {                     \
  46                 .fn = do_no_restart_syscall,    \
  47         },                                      \
  48 }
  49
  50 #define init_thread_info        (init_thread_union.thread_info)
  51 #define init_stack              (init_thread_union.stack)
  52
  53 /* how to get the thread information struct from C */
  54 static inline struct thread_info *current_thread_info(void)
  55 {
  56         struct thread_info *ti;
  57
  58         __asm__ __volatile__ ("getcon " __KCR0 ", %0\n\t" : "=r" (ti));
  59
  60         return ti;
  61 }
  62
  63 /* thread information allocation */
  64 #define alloc_thread_info(ti) ((struct thread_info *) __get_free_pages(GFP_KERNEL,2))
  65 #define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
  66 #define get_thread_info(ti) get_task_struct((ti)->task)
  67 #define put_thread_info(ti) put_task_struct((ti)->task)
  68
  69 #endif /* __ASSEMBLY__ */
  70
  71 #define PREEMPT_ACTIVE          0x4000000
  72
  73 /* thread information flags */
  74 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  75 #define TIF_SIGPENDING          2       /* signal pending */
  76 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  77
  78 #define THREAD_SIZE     16384
  79
  80 #endif /* __KERNEL__ */
  81
  82 #endif /* __ASM_SH64_THREAD_INFO_H */