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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.

 */

/** @addtogroup amd64  

 * @{

 */

/** @file

 */

#ifndef KERN_amd64_ASM_H_

#define KERN_amd64_ASM_H_

#include <config.h>

extern void asm_delay_loop(uint32_t t);

extern void asm_fake_loop(uint32_t t);

/** 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 uintptr_t get_stack_base(void)

{

    uintptr_t v;

    asm volatile ("andq %%rsp, %0\n" : "=r" (v) : "0" (~((uint64_t)STACK_SIZE-1)));

    return v;

}

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

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

/** Byte from port

 *

 * Get byte from port

 *

 * @param port Port to read from

 * @return Value read

 */

static inline uint8_t inb(uint16_t port) { uint8_t val; __asm__ volatile ("inb %w1, %b0 \n" : "=a" (val) : "d" (port) ); return val; }

/** Byte to port

 *

 * Output byte to port

 *

 * @param port Port to write to

 * @param val Value to write

 */

static inline void outb(uint16_t port, uint8_t val) { __asm__ volatile ("outb %b0, %w1\n" : : "a" (val), "d" (port) ); }

/** Swap Hidden part of GS register with visible one */

static inline void swapgs(void) { __asm__ volatile("swapgs"); }

/** 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 (

        "pushfq\n"

        "popq %0\n"

        "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 (

        "pushfq\n"

        "popq %0\n"

        "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 (

        "pushq %0\n"

        "popfq\n"

        : : "r" (ipl)

        );

}

/** Return interrupt priority level.

 *

 * Return EFLAFS.

 *

 * @return Current interrupt priority level.

 */

static inline ipl_t interrupts_read(void) {

    ipl_t v;

    __asm__ volatile (

        "pushfq\n"

        "popq %0\n"

        : "=r" (v)

    );

    return v;

}

/** Write to MSR */

static inline void write_msr(uint32_t msr, uint64_t value)

{

    __asm__ volatile (

        "wrmsr;" : : "c" (msr),

        "a" ((uint32_t)(value)),

        "d" ((uint32_t)(value >> 32))

        );

}

static inline unative_t read_msr(uint32_t msr)

{

    uint32_t ax, dx;

    __asm__ volatile (

        "rdmsr;" : "=a"(ax), "=d"(dx) : "c" (msr)

        );

    return ((uint64_t)dx << 32) | ax;

}

/** Enable local APIC

 *

 * Enable local APIC in MSR.

 */

static inline void enable_l_apic_in_msr()

{

    __asm__ volatile (

        "movl $0x1b, %%ecx\n"

        "rdmsr\n"

        "orl $(1<<11),%%eax\n"

        "orl $(0xfee00000),%%eax\n"

        "wrmsr\n"

        :

        :

        :"%eax","%ecx","%edx"

        );

}

static inline uintptr_t * get_ip()

{

    uintptr_t *ip;

    __asm__ volatile (

        "mov %%rip, %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(uintptr_t addr)

{

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

}

/** Load GDTR register from memory.

 *

 * @param gdtr_reg Address of memory from where to load GDTR.

 */

static inline void gdtr_load(struct ptr_16_64 *gdtr_reg)

{

    __asm__ volatile ("lgdtq %0\n" : : "m" (*gdtr_reg));

}

/** Store GDTR register to memory.

 *

 * @param gdtr_reg Address of memory to where to load GDTR.

 */

static inline void gdtr_store(struct ptr_16_64 *gdtr_reg)

{

    __asm__ volatile ("sgdtq %0\n" : : "m" (*gdtr_reg));

}

/** Load IDTR register from memory.

 *

 * @param idtr_reg Address of memory from where to load IDTR.

 */

static inline void idtr_load(struct ptr_16_64 *idtr_reg)

{

    __asm__ volatile ("lidtq %0\n" : : "m" (*idtr_reg));

}

/** Load TR from descriptor table.

 *

 * @param sel Selector specifying descriptor of TSS segment.

 */

static inline void tr_load(uint16_t sel)

{

    __asm__ volatile ("ltr %0" : : "r" (sel));

}

#define GEN_READ_REG(reg) static inline unative_t read_ ##reg (void) \

    { \

    unative_t res; \

    __asm__ volatile ("movq %%" #reg ", %0" : "=r" (res) ); \

    return res; \

    }

#define GEN_WRITE_REG(reg) static inline void write_ ##reg (unative_t regn) \

    { \

    __asm__ volatile ("movq %0, %%" #reg : : "r" (regn)); \

    }

GEN_READ_REG(cr0);

GEN_READ_REG(cr2);

GEN_READ_REG(cr3);

GEN_WRITE_REG(cr3);

GEN_READ_REG(dr0);

GEN_READ_REG(dr1);

GEN_READ_REG(dr2);

GEN_READ_REG(dr3);

GEN_READ_REG(dr6);

GEN_READ_REG(dr7);

GEN_WRITE_REG(dr0);

GEN_WRITE_REG(dr1);

GEN_WRITE_REG(dr2);

GEN_WRITE_REG(dr3);

GEN_WRITE_REG(dr6);

GEN_WRITE_REG(dr7);

extern size_t interrupt_handler_size;

extern void interrupt_handlers(void);

#endif

/** @}

 */