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/*
 * Copyright (C) 2005 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.
 */

#ifndef __amd64_ASM_H__
#define __amd64_ASM_H__

#include <arch/types.h>
#include <config.h>


void asm_delay_loop(__u32 t);
void asm_fake_loop(__u32 t);


/* TODO: implement the real stuff */
static inline __address get_stack_base(void)
{
    return NULL;
}

static inline void cpu_sleep(void) { __asm__("hlt"); };


static inline __u8 inb(__u16 port) 
{
    __u8 out;

    asm (
        "mov %0, %%dx;"
        "inb %%dx,%%al;"
        "mov %%al, %1;"
        :"=m"(out)
        :"m"(port)
        :"%dx","%al"
        );
    return out;
}

static inline __u8 outb(__u16 port,__u8 b) 
{
    asm (
        "mov %0,%%dx;"
        "mov %1,%%al;"
        "outb %%al,%%dx;"
        :
        :"m"( port), "m" (b)
        :"%dx","%al"
        );
}

/** Set priority level low
 *
 * Enable interrupts and return previous
 * value of EFLAGS.
 */
static inline pri_t cpu_priority_low(void) {
    pri_t v;
    __asm__ volatile (
        "pushfq\n"
        "popq %0\n"
        "sti\n"
        : "=r" (v)
    );
    return v;
}

/** Set priority level high
 *
 * Disable interrupts and return previous
 * value of EFLAGS.
 */
static inline pri_t cpu_priority_high(void) {
    pri_t v;
    __asm__ volatile (
        "pushfq\n"
        "popq %0\n"
        "cli\n"
        : "=r" (v)
        );
    return v;
}

/** Restore priority level
 *
 * Restore EFLAGS.
 */
static inline void cpu_priority_restore(pri_t pri) {
    __asm__ volatile (
        "pushq %0\n"
        "popfq\n"
        : : "r" (pri)
        );
}

/** Return raw priority level
 *
 * Return EFLAFS.
 */
static inline pri_t cpu_priority_read(void) {
    pri_t v;
    __asm__ volatile (
        "pushfq\n"
        "popq %0\n"
        : "=r" (v)
    );
    return v;
}

/** Read CR2
 *
 * Return value in CR2
 *
 * @return Value read.
 */
static inline __u32 read_cr2(void) { __u64 v; __asm__ volatile ("movq %%cr2,%0" : "=r" (v)); return v; }

/** Write CR3
 *
 * Write value to CR3.
 *
 * @param v Value to be written.
 */
static inline void write_cr3(__u64 v) { __asm__ volatile ("movq %0,%%cr3\n" : : "r" (v)); }

/** Read CR3
 *
 * Return value in CR3
 *
 * @return Value read.
 */
static inline __u32 read_cr3(void) { __u64 v; __asm__ volatile ("movq %%cr3,%0" : "=r" (v)); return v; }

/** Set priority level low
 *
 * Enable interrupts and return previous
 * value of EFLAGS.
 */



extern size_t interrupt_handler_size;
extern void interrupt_handlers(void);

#endif