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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 #define __HAVE_ARCH_THREAD_INFO_ALLOCATOR
  15
  16 #ifndef __ASSEMBLY__
  17 #include <asm/types.h>
  18 #include <asm/processor.h>
  19 #include <asm/arch/thread_info.h>
  20 #include <asm/segment.h>
  21 #endif
  22
  23
  24 /*
  25  * low level task data that entry.S needs immediate access to
  26  * - this struct should fit entirely inside of one cache line
  27  * - this struct shares the supervisor stack pages
  28  * - if the contents of this structure are changed, the assembly constants must also be changed
  29  */
  30 #ifndef __ASSEMBLY__
  31 struct thread_info {
  32         struct task_struct      *task;          /* main task structure */
  33         struct exec_domain      *exec_domain;   /* execution domain */
  34         unsigned long           flags;          /* low level flags */
  35         __u32                   cpu;            /* current CPU */
  36         int                     preempt_count;  /* 0 => preemptable, <0 => BUG */
  37         __u32                   tls;            /* TLS for this thread */
  38
  39         mm_segment_t            addr_limit;     /* thread address space:
  40                                                    0-0xBFFFFFFF for user-thead
  41                                                    0-0xFFFFFFFF for kernel-thread
  42                                                 */
  43         struct restart_block    restart_block;
  44         __u8                    supervisor_stack[0];
  45 };
  46
  47 #endif
  48
  49 #define PREEMPT_ACTIVE          0x10000000
  50
  51 /*
  52  * macros/functions for gaining access to the thread information structure
  53  *
  54  * preempt_count needs to be 1 initially, until the scheduler is functional.
  55  */
  56 #ifndef __ASSEMBLY__
  57 #define INIT_THREAD_INFO(tsk)                           \
  58 {                                                       \
  59         .task           = &tsk,                         \
  60         .exec_domain    = &default_exec_domain,         \
  61         .flags          = 0,                            \
  62         .cpu            = 0,                            \
  63         .preempt_count  = 1,                            \
  64         .addr_limit     = KERNEL_DS,                    \
  65         .restart_block = {                              \
  66                        .fn = do_no_restart_syscall,     \
  67         },                                              \
  68 }
  69
  70 #define init_thread_info        (init_thread_union.thread_info)
  71
  72 /* thread information allocation */
  73 #define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
  74 #define free_thread_info(ti) free_pages((unsigned long) (ti), 1)
  75
  76 #endif /* !__ASSEMBLY__ */
  77
  78 /*
  79  * thread information flags
  80  * - these are process state flags that various assembly files may need to access
  81  * - pending work-to-be-done flags are in LSW
  82  * - other flags in MSW
  83  */
  84 #define TIF_SYSCALL_TRACE       0       /* syscall trace active */
  85 #define TIF_NOTIFY_RESUME       1       /* resumption notification requested */
  86 #define TIF_SIGPENDING          2       /* signal pending */
  87 #define TIF_NEED_RESCHED        3       /* rescheduling necessary */
  88 #define TIF_RESTORE_SIGMASK     9       /* restore signal mask in do_signal() */
  89 #define TIF_POLLING_NRFLAG      16      /* true if poll_idle() is polling TIF_NEED_RESCHED */
  90 #define TIF_MEMDIE              17
  91
  92 #define _TIF_SYSCALL_TRACE      (1<<TIF_SYSCALL_TRACE)
  93 #define _TIF_NOTIFY_RESUME      (1<<TIF_NOTIFY_RESUME)
  94 #define _TIF_SIGPENDING         (1<<TIF_SIGPENDING)
  95 #define _TIF_NEED_RESCHED       (1<<TIF_NEED_RESCHED)
  96 #define _TIF_RESTORE_SIGMASK    (1<<TIF_RESTORE_SIGMASK)
  97 #define _TIF_POLLING_NRFLAG     (1<<TIF_POLLING_NRFLAG)
  98
  99 #define _TIF_WORK_MASK          0x0000FFFE      /* work to do on interrupt/exception return */
 100 #define _TIF_ALLWORK_MASK       0x0000FFFF      /* work to do on any return to u-space */
 101
 102 #endif /* __KERNEL__ */
 103
 104 #endif /* _ASM_THREAD_INFO_H */