thread_info.h

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/* thread_info.h: CRIS low-level thread information
 *
 * Copyright (C) 2002  David Howells ([email protected])
 * - 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__

#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)

#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_MEMDIE      17  /* is terminating due to OOM killer */

#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_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 */