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/*
 * Copyright (c) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup generic
 * @{
 */
/** @file
 */

#ifndef KERN_CPU_H_
#define KERN_CPU_H_

#include <mm/tlb.h>
#include <synch/spinlock.h>
#include <proc/scheduler.h>
#include <arch/cpu.h>
#include <arch/context.h>

#define CPU_STACK_SIZE  STACK_SIZE

/** CPU structure.
 *
 * There is one structure like this for every processor.
 */
typedef struct {
    SPINLOCK_DECLARE(lock);

    tlb_shootdown_msg_t tlb_messages[TLB_MESSAGE_QUEUE_LEN];
    size_t tlb_messages_count;
    
    context_t saved_context;

    atomic_t nrdy;
    runq_t rq[RQ_COUNT];
    volatile size_t needs_relink;

    SPINLOCK_DECLARE(timeoutlock);
    link_t timeout_active_head;

    size_t missed_clock_ticks;  /**< When system clock loses a tick, it is recorded here
                         so that clock() can react. This variable is
                         CPU-local and can be only accessed when interrupts
                         are disabled. */

    /**
     * Processor ID assigned by kernel.
     */
    unsigned int id;
    
    int active;
    int tlb_active;

    uint16_t frequency_mhz;
    uint32_t delay_loop_const;

    cpu_arch_t arch;

    struct thread *fpu_owner;
    
    /**
     * Stack used by scheduler when there is no running thread.
     */
    uint8_t *stack;
} cpu_t;

extern cpu_t *cpus;

extern void cpu_init(void);
extern void cpu_list(void);

extern void cpu_arch_init(void);
extern void cpu_identify(void);
extern void cpu_print_report(cpu_t *m);

#endif

/** @}
 */