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/*

 * Copyright (C) 2001-2004 Jakub Jermar

 * Copyright (C) 2005 Sergey Bondari

 * 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 __ia32_ASM_H__

#define __ia32_ASM_H__

#include <arch/types.h>

#include <config.h>

extern __u32 interrupt_handler_size;

extern void paging_on(void);

extern void interrupt_handlers(void);

extern void enable_l_apic_in_msr(void);

extern void asm_delay_loop(__u32 t);

extern void asm_fake_loop(__u32 t);

/** Halt CPU

 *

 * Halt the current CPU until interrupt event.

 */

static inline void cpu_halt(void) { __asm__("hlt\n"); };

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

/** Read CR2

 *

 * Return value in CR2

 *

 * @return Value read.

 */

static inline __u32 read_cr2(void) { __u32 v; __asm__ volatile ("movl %%cr2,%0\n" : "=r" (v)); return v; }

/** Write CR3

 *

 * Write value to CR3.

 *

 * @param v Value to be written.

 */

static inline void write_cr3(__u32 v) { __asm__ volatile ("movl %0,%%cr3\n" : : "r" (v)); }

/** Read CR3

 *

 * Return value in CR3

 *

 * @return Value read.

 */

static inline __u32 read_cr3(void) { __u32 v; __asm__ volatile ("movl %%cr3,%0\n" : "=r" (v)); return v; }

/** Byte to port

 *

 * Output byte to port

 *

 * @param port Port to write to

 * @param val Value to write

 */

static inline void outb(__u16 port, __u8 val) { __asm__ volatile ("outb %b0, %w1\n" : : "a" (val), "d" (port) ); }

/** Word to port

 *

 * Output word to port

 *

 * @param port Port to write to

 * @param val Value to write

 */

static inline void outw(__u16 port, __u16 val) { __asm__ volatile ("outw %w0, %w1\n" : : "a" (val), "d" (port) ); }

/** Double word to port

 *

 * Output double word to port

 *

 * @param port Port to write to

 * @param val Value to write

 */

static inline void outl(__u16 port, __u32 val) { __asm__ volatile ("outl %l0, %w1\n" : : "a" (val), "d" (port) ); }

/** Byte from port

 *

 * Get byte from port

 *

 * @param port Port to read from

 * @return Value read

 */

static inline __u8 inb(__u16 port) { __u8 val; __asm__ volatile ("inb %w1, %b0 \n" : "=a" (val) : "d" (port) ); return val; }

/** Word from port

 *

 * Get word from port

 *

 * @param port Port to read from

 * @return Value read

 */

static inline __u16 inw(__u16 port) { __u16 val; __asm__ volatile ("inw %w1, %w0 \n" : "=a" (val) : "d" (port) ); return val; }

/** Double word from port

 *

 * Get double word from port

 *

 * @param port Port to read from

 * @return Value read

 */

static inline __u32 inl(__u16 port) { __u32 val; __asm__ volatile ("inl %w1, %l0 \n" : "=a" (val) : "d" (port) ); return val; }

/** Enable interrupts.

 *

 * Enable interrupts and return previous

 * value of EFLAGS.

 *

 * @return Old interrupt priority level.

 */

static inline ipl_t interrupts_enable(void)

{

    ipl_t v;

    __asm__ volatile (

        "pushf\n\t"

        "popl %0\n\t"

        "sti\n"

        : "=r" (v)

    );

    return v;

}

/** Disable interrupts.

 *

 * Disable interrupts and return previous

 * value of EFLAGS.

 *

 * @return Old interrupt priority level.

 */

static inline ipl_t interrupts_disable(void)

{

    ipl_t v;

    __asm__ volatile (

        "pushf\n\t"

        "popl %0\n\t"

        "cli\n"

        : "=r" (v)

    );

    return v;

}

/** Restore interrupt priority level.

 *

 * Restore EFLAGS.

 *

 * @param ipl Saved interrupt priority level.

 */

static inline void interrupts_restore(ipl_t ipl)

{

    __asm__ volatile (

        "pushl %0\n\t"

        "popf\n"

        : : "r" (ipl)

    );

}

/** Return interrupt priority level.

 *

 * @return EFLAFS.

 */

static inline ipl_t interrupts_read(void)

{

    ipl_t v;

    __asm__ volatile (

        "pushf\n\t"

        "popl %0\n"

        : "=r" (v)

    );

    return v;

}

/** Return base address of current stack

 *

 * Return the base address of the current stack.

 * The stack is assumed to be STACK_SIZE bytes long.

 * The stack must start on page boundary.

 */

static inline __address get_stack_base(void)

{

    __address v;

    __asm__ volatile ("andl %%esp, %0\n" : "=r" (v) : "0" (~(STACK_SIZE-1)));

    return v;

}

static inline __u64 rdtsc(void)

{

    __u64 v;

    __asm__ volatile("rdtsc\n" : "=A" (v));

    return v;

}

/** Return current IP address */

static inline __address * get_ip()

{

    __address *ip;

    __asm__ volatile (

        "mov %%eip, %0"

        : "=r" (ip)

        );

    return ip;

}

/** Invalidate TLB Entry.

 *

 * @param addr Address on a page whose TLB entry is to be invalidated.

 */

static inline void invlpg(__address addr)

{

    __asm__ volatile ("invlpg %0\n" :: "m" (addr));

}

#endif