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thread_info.h

/*
 * Copyright (C) 2004-2006 Atmel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __ASM_AVR32_THREAD_INFO_H
#define __ASM_AVR32_THREAD_INFO_H

#include <asm/page.h>

#define THREAD_SIZE_ORDER     1
#define THREAD_SIZE           (PAGE_SIZE << THREAD_SIZE_ORDER)

#ifndef __ASSEMBLY__
#include <asm/types.h>

struct task_struct;
struct exec_domain;

00022 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;
      __s32             preempt_count;    /* 0 => preemptable, <0 => BUG */
      __u32             rar_saved;  /* return address... */
      __u32             rsr_saved;  /* ...and status register
                                       saved by debug handler
                                       when setting up
                                       trampoline */
      struct restart_block    restart_block;
      __u8              supervisor_stack[0];
};

#define INIT_THREAD_INFO(tsk)                               \
{                                                     \
      .task       = &tsk,                                   \
      .exec_domain      = &default_exec_domain,                   \
      .flags            = 0,                                \
      .cpu        = 0,                                \
      .preempt_count    = INIT_PREEMPT_COUNT,                     \
      .restart_block    = {                                 \
            .fn   = do_no_restart_syscall                   \
      }                                               \
}

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

/*
 * Get the thread information struct from C.
 * We do the usual trick and use the lower end of the stack for this
 */
static inline struct thread_info *current_thread_info(void)
{
      unsigned long addr = ~(THREAD_SIZE - 1);

      asm("and %0, sp" : "=r"(addr) : "0"(addr));
      return (struct thread_info *)addr;
}

#define get_thread_info(ti) get_task_struct((ti)->task)
#define put_thread_info(ti) put_task_struct((ti)->task)

#endif /* !__ASSEMBLY__ */

#define PREEMPT_ACTIVE        0x40000000

/*
 * 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_SIGPENDING          1       /* signal pending */
#define TIF_NEED_RESCHED        2       /* rescheduling necessary */
#define TIF_POLLING_NRFLAG      3       /* true if poll_idle() is polling
                                 TIF_NEED_RESCHED */
#define TIF_BREAKPOINT        4     /* enter monitor mode on return */
#define TIF_SINGLE_STEP       5     /* single step in progress */
#define TIF_MEMDIE            6     /* is terminating due to OOM killer */
#define TIF_RESTORE_SIGMASK   7     /* restore signal mask in do_signal */
#define TIF_CPU_GOING_TO_SLEEP      8     /* CPU is entering sleep 0 mode */
#define TIF_NOTIFY_RESUME     9     /* callback before returning to user */
#define TIF_FREEZE            29
#define TIF_DEBUG       30    /* debugging enabled */
#define TIF_USERSPACE         31      /* true if FS sets userspace */

#define _TIF_SYSCALL_TRACE    (1 << TIF_SYSCALL_TRACE)
#define _TIF_SIGPENDING       (1 << TIF_SIGPENDING)
#define _TIF_NEED_RESCHED     (1 << TIF_NEED_RESCHED)
#define _TIF_POLLING_NRFLAG   (1 << TIF_POLLING_NRFLAG)
#define _TIF_SINGLE_STEP      (1 << TIF_SINGLE_STEP)
#define _TIF_MEMDIE           (1 << TIF_MEMDIE)
#define _TIF_RESTORE_SIGMASK  (1 << TIF_RESTORE_SIGMASK)
#define _TIF_CPU_GOING_TO_SLEEP (1 << TIF_CPU_GOING_TO_SLEEP)
#define _TIF_NOTIFY_RESUME    (1 << TIF_NOTIFY_RESUME)
#define _TIF_FREEZE           (1 << TIF_FREEZE)

/* Note: The masks below must never span more than 16 bits! */

/* work to do on interrupt/exception return */
#define _TIF_WORK_MASK                    \
      ((1 << TIF_SIGPENDING)              \
       | _TIF_NOTIFY_RESUME               \
       | (1 << TIF_NEED_RESCHED)          \
       | (1 << TIF_POLLING_NRFLAG)        \
       | (1 << TIF_BREAKPOINT)            \
       | (1 << TIF_RESTORE_SIGMASK))

/* work to do on any return to userspace */
#define _TIF_ALLWORK_MASK     (_TIF_WORK_MASK | (1 << TIF_SYSCALL_TRACE) | \
                         _TIF_NOTIFY_RESUME)
/* work to do on return from debug mode */
#define _TIF_DBGWORK_MASK     (_TIF_WORK_MASK & ~(1 << TIF_BREAKPOINT))

#endif /* __ASM_AVR32_THREAD_INFO_H */

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