LXR linux/include/asm-cris/thread

   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__
  31struct 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 */
 105