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thread_info.h

/* thread_info.h: CRIS low-level thread information
 *
 * Copyright (C) 2002  David Howells (dhowells@redhat.com)
 * - Incorporating suggestions made by Linus Torvalds and Dave Miller
 * 
 * CRIS port by Axis Communications
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#ifdef __KERNEL__

#define __HAVE_ARCH_THREAD_INFO_ALLOCATOR

#ifndef __ASSEMBLY__
#include <asm/types.h>
#include <asm/processor.h>
#include <arch/thread_info.h>
#include <asm/segment.h>
#endif


/*
 * low level task data that entry.S needs immediate access to
 * - this struct should fit entirely inside of one cache line
 * - this struct shares the supervisor stack pages
 * - if the contents of this structure are changed, the assembly constants must also be changed
 */
#ifndef __ASSEMBLY__
struct thread_info {
      struct task_struct      *task;            /* main task structure */
      struct exec_domain      *exec_domain;     /* execution domain */
      unsigned long           flags;            /* low level flags */
      __u32             cpu;        /* current CPU */
      int               preempt_count;    /* 0 => preemptable, <0 => BUG */
      __u32             tls;        /* TLS for this thread */

      mm_segment_t            addr_limit; /* thread address space:
                                       0-0xBFFFFFFF for user-thead
                                       0-0xFFFFFFFF for kernel-thread
                                    */
      struct restart_block    restart_block;
      __u8              supervisor_stack[0];
};

#endif

#define PREEMPT_ACTIVE        0x10000000

/*
 * macros/functions for gaining access to the thread information structure
 */
#ifndef __ASSEMBLY__
#define INIT_THREAD_INFO(tsk)                   \
{                                         \
      .task       = &tsk,                       \
      .exec_domain      = &default_exec_domain,       \
      .flags            = 0,                    \
      .cpu        = 0,                    \
      .preempt_count    = INIT_PREEMPT_COUNT,         \
      .addr_limit = KERNEL_DS,                  \
      .restart_block = {                        \
                   .fn = do_no_restart_syscall, \
      },                                  \
}

#define init_thread_info      (init_thread_union.thread_info)

/* thread information allocation */
#define alloc_thread_info(tsk) ((struct thread_info *) __get_free_pages(GFP_KERNEL,1))
#define free_thread_info(ti) free_pages((unsigned long) (ti), 1)

#endif /* !__ASSEMBLY__ */

/*
 * thread information flags
 * - these are process state flags that various assembly files may need to access
 * - pending work-to-be-done flags are in LSW
 * - other flags in MSW
 */
#define TIF_SYSCALL_TRACE     0     /* syscall trace active */
#define TIF_NOTIFY_RESUME     1     /* resumption notification requested */
#define TIF_SIGPENDING        2     /* signal pending */
#define TIF_NEED_RESCHED      3     /* rescheduling necessary */
#define TIF_RESTORE_SIGMASK   9     /* restore signal mask in do_signal() */
#define TIF_POLLING_NRFLAG    16    /* true if poll_idle() is polling TIF_NEED_RESCHED */
#define TIF_MEMDIE            17
#define TIF_FREEZE            18    /* is freezing for suspend */

#define _TIF_SYSCALL_TRACE    (1<<TIF_SYSCALL_TRACE)
#define _TIF_NOTIFY_RESUME    (1<<TIF_NOTIFY_RESUME)
#define _TIF_SIGPENDING       (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED     (1<<TIF_NEED_RESCHED)
#define _TIF_RESTORE_SIGMASK  (1<<TIF_RESTORE_SIGMASK)
#define _TIF_POLLING_NRFLAG   (1<<TIF_POLLING_NRFLAG)
#define _TIF_FREEZE           (1<<TIF_FREEZE)

#define _TIF_WORK_MASK        0x0000FFFE  /* work to do on interrupt/exception return */
#define _TIF_ALLWORK_MASK     0x0000FFFF  /* work to do on any return to u-space */

#endif /* __KERNEL__ */

#endif /* _ASM_THREAD_INFO_H */

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