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thread_info.h

/*
 *  include/asm-s390/thread_info.h
 *
 *  S390 version
 *    Copyright (C) IBM Corp. 2002,2006
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
 */

#ifndef _ASM_THREAD_INFO_H
#define _ASM_THREAD_INFO_H

#ifdef __KERNEL__

/*
 * Size of kernel stack for each process
 */
#ifndef __s390x__
#ifndef __SMALL_STACK
#define THREAD_ORDER 1
#define ASYNC_ORDER  1
#else
#define THREAD_ORDER 0
#define ASYNC_ORDER  0
#endif
#else /* __s390x__ */
#ifndef __SMALL_STACK
#define THREAD_ORDER 2
#define ASYNC_ORDER  2
#else
#define THREAD_ORDER 1
#define ASYNC_ORDER  1
#endif
#endif /* __s390x__ */

#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
#define ASYNC_SIZE  (PAGE_SIZE << ASYNC_ORDER)

#ifndef __ASSEMBLY__
#include <asm/processor.h>
#include <asm/lowcore.h>

/*
 * 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
 */
struct thread_info {
      struct task_struct      *task;            /* main task structure */
      struct exec_domain      *exec_domain;     /* execution domain */
      unsigned long           flags;            /* low level flags */
      unsigned int            cpu;        /* current CPU */
      int               preempt_count;    /* 0 => preemptable, <0 => BUG */
      struct restart_block    restart_block;
};

/*
 * macros/functions for gaining access to the thread information structure
 */
#define INIT_THREAD_INFO(tsk)             \
{                                   \
      .task       = &tsk,                 \
      .exec_domain      = &default_exec_domain, \
      .flags            = 0,              \
      .cpu        = 0,              \
      .preempt_count    = 1,              \
      .restart_block    = {               \
            .fn = do_no_restart_syscall,  \
      },                            \
}

#define init_thread_info      (init_thread_union.thread_info)
#define init_stack            (init_thread_union.stack)

/* how to get the thread information struct from C */
static inline struct thread_info *current_thread_info(void)
{
      return (struct thread_info *)((*(unsigned long *) __LC_KERNEL_STACK)-THREAD_SIZE);
}

#define THREAD_SIZE_ORDER THREAD_ORDER

#endif

/*
 * thread information flags bit numbers
 */
#define TIF_SYSCALL_TRACE     0     /* syscall trace active */
#define TIF_SIGPENDING        2     /* signal pending */
#define TIF_NEED_RESCHED      3     /* rescheduling necessary */
#define TIF_RESTART_SVC       4     /* restart svc with new svc number */
#define TIF_SYSCALL_AUDIT     5     /* syscall auditing active */
#define TIF_SINGLE_STEP       6     /* deliver sigtrap on return to user */
#define TIF_MCCK_PENDING      7     /* machine check handling is pending */
#define TIF_USEDFPU           16    /* FPU was used by this task this quantum (SMP) */
#define TIF_POLLING_NRFLAG    17    /* true if poll_idle() is polling 
                                 TIF_NEED_RESCHED */
#define TIF_31BIT       18    /* 32bit process */ 
#define TIF_MEMDIE            19
#define TIF_RESTORE_SIGMASK   20    /* restore signal mask in do_signal() */

#define _TIF_SYSCALL_TRACE    (1<<TIF_SYSCALL_TRACE)
#define _TIF_RESTORE_SIGMASK  (1<<TIF_RESTORE_SIGMASK)
#define _TIF_SIGPENDING       (1<<TIF_SIGPENDING)
#define _TIF_NEED_RESCHED     (1<<TIF_NEED_RESCHED)
#define _TIF_RESTART_SVC      (1<<TIF_RESTART_SVC)
#define _TIF_SYSCALL_AUDIT    (1<<TIF_SYSCALL_AUDIT)
#define _TIF_SINGLE_STEP      (1<<TIF_SINGLE_STEP)
#define _TIF_MCCK_PENDING     (1<<TIF_MCCK_PENDING)
#define _TIF_USEDFPU          (1<<TIF_USEDFPU)
#define _TIF_POLLING_NRFLAG   (1<<TIF_POLLING_NRFLAG)
#define _TIF_31BIT            (1<<TIF_31BIT)

#endif /* __KERNEL__ */

#define PREEMPT_ACTIVE        0x4000000

#endif /* _ASM_THREAD_INFO_H */

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