root/include/asm-cris/thread_info.h

INCLUDED FROM

/* 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 <asm/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
 *
 * preempt_count needs to be 1 initially, until the scheduler is functional.
 */
#ifndef __ASSEMBLY__
#define INIT_THREAD_INFO(tsk)                           \
{                                                       \
        .task           = &tsk,                         \
        .exec_domain    = &default_exec_domain,         \
        .flags          = 0,                            \
        .cpu            = 0,                            \
        .preempt_count  = 1,                            \
        .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_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_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 */