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   1 /* thread_info.h: CRIS low-level thread information
   2  *
   3  * Copyright (C) 2002  David Howells (dhowells@redhat.com)
   4  * - Incorporating suggestions made by Linus Torvalds and Dave Miller
   5  *
   6  * CRIS port by Axis Communications
   7  */
   8
   9 #ifndef _ASM_THREAD_INFO_H
  10 #define _ASM_THREAD_INFO_H
  11
  12 #ifdef __KERNEL__
  13
  14 #ifndef __ASSEMBLY__
  15 #include <asm/types.h>
  16 #include <asm/processor.h>
  17 #include <asm/arch/thread_info.h>
  18 #include <asm/segment.h>
  19 #endif
  20
  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 must also be changed
  27  */
  28 #ifndef __ASSEMBLY__
  29 struct 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         __u32                   cpu;            /* current CPU */
  34         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  35
  36         mm_segment_t            addr_limit;     /* thread address space:
  37                                                    0-0xBFFFFFFF for user-thead
  38                                                    0-0xFFFFFFFF for kernel-thread
  39                                                 */
  40         struct restart_block    restart_block;
  41         __u8                    supervisor_stack[0];
  42 };
  43
  44 #endif
  45
  46 #define PREEMPT_ACTIVE          0x10000000
  47
  48 /*
  49  * macros/functions for gaining access to the thread information structure
  50  *
  51  * preempt_count needs to be 1 initially, until the scheduler is functional.
  52  */
  53 #ifndef __ASSEMBLY__
  54 #define INIT_THREAD_INFO(tsk)                           \
  55 {                                                       \
  56         .task           = &tsk,                         \
  57         .exec_domain    = &default_exec_domain,         \
  58         .flags          = 0,                            \
  59         .cpu            = 0,                            \
  60         .preempt_count  = 1,                            \
  61         .addr_limit     = KERNEL_DS,                    \
  62         .restart_block = {                              \
  63                        .fn = do_no_restart_syscall,     \
  64         },                                              \
  65 }
  66
  67 #define init_thread_info        (init_thread_union.thread_info)
  68
  69 /* thread information allocation */
  70 #define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
  71 #define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
  72
  73 #endif /* !__ASSEMBLY__ */
  74
  75 /*
  76  * thread information flags
  77  * - these are process state flags that various assembly files may need to access
  78  * - pending work-to-be-done flags are in LSW
  79  * - other flags in MSW
  80  */
  81 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  82 #define TIF_SIGPENDING          1       /* signal pending */
  83 #define TIF_NEED_RESCHED        2       /* rescheduling necessary */
  84 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
  85 #define TIF_MEMDIE              17
  86
  87 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  88 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  89 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  90 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
  91
  92 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
  93 #define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
  94
  95 #endif /* __KERNEL__ */
  96
  97 #endif /* _ASM_THREAD_INFO_H */