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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 __ia64_ASM_H__

#define __ia64_ASM_H__

#include <config.h>

#include <arch/types.h>

#include <arch/register.h>

/** Return base address of current stack

 *

 * Return the base address of the current stack.

 * The stack is assumed to be STACK_SIZE long.

 * The stack must start on page boundary.

 */

static inline __address get_stack_base(void)

{

    __u64 v;

    __asm__ volatile ("and %0 = %1, r12" : "=r" (v) : "r" (~(STACK_SIZE-1)));

    return v;

}

/** Return Processor State Register.

 *

 * @return PSR.

 */

static inline __u64 psr_read(void)

{

    __u64 v;

    __asm__ volatile ("mov %0 = psr\n" : "=r" (v));

    return v;

}

/** Read IVA (Interruption Vector Address).

 *

 * @return Return location of interruption vector table.

 */

static inline __u64 iva_read(void)

{

    __u64 v;

    __asm__ volatile ("mov %0 = cr.iva\n" : "=r" (v));

    return v;

}

/** Write IVA (Interruption Vector Address) register.

 *

 * @param New location of interruption vector table.

 */

static inline void iva_write(__u64 v)

{

    __asm__ volatile ("mov cr.iva = %0\n" : : "r" (v));

}

/** Read IVR (External Interrupt Vector Register).

 *

 * @return Highest priority, pending, unmasked external interrupt vector.

 */

static inline __u64 ivr_read(void)

{

    __u64 v;

    __asm__ volatile ("mov %0 = cr.ivr\n" : "=r" (v));

    return v;

}

/** Write ITC (Interval Timer Counter) register.

 *

 * @param New counter value.

 */

static inline void itc_write(__u64 v)

{

    __asm__ volatile ("mov ar.itc = %0\n" : : "r" (v));

}

/** Read ITC (Interval Timer Counter) register.

 *

 * @return Current counter value.

 */

static inline __u64 itc_read(void)

{

    __u64 v;

    __asm__ volatile ("mov %0 = ar.itc\n" : "=r" (v));

    return v;

}

/** Write ITM (Interval Timer Match) register.

 *

 * @param New match value.

 */

static inline void itm_write(__u64 v)

{

    __asm__ volatile ("mov cr.itm = %0\n" : : "r" (v));

}

/** Read ITV (Interval Timer Vector) register.

 *

 * @return Current vector and mask bit.

 */

static inline __u64 itv_read(void)

{

    __u64 v;

    __asm__ volatile ("mov %0 = cr.itv\n" : "=r" (v));

    return v;

}

/** Write ITV (Interval Timer Vector) register.

 *

 * @param New vector and mask bit.

 */

static inline void itv_write(__u64 v)

{

    __asm__ volatile ("mov cr.itv = %0\n" : : "r" (v));

}

/** Write EOI (End Of Interrupt) register.

 *

 * @param This value is ignored.

 */

static inline void eoi_write(__u64 v)

{

    __asm__ volatile ("mov cr.eoi = %0\n" : : "r" (v));

}

/** Read TPR (Task Priority Register).

 *

 * @return Current value of TPR.

 */

static inline __u64 tpr_read(void)

{

    __u64 v;

    __asm__ volatile ("mov %0 = cr.tpr\n"  : "=r" (v));

    return v;

}

/** Write TPR (Task Priority Register).

 *

 * @param New value of TPR.

 */

static inline void tpr_write(__u64 v)

{

    __asm__ volatile ("mov cr.tpr = %0\n" : : "r" (v));

}

/** Disable interrupts.

 *

 * Disable interrupts and return previous

 * value of PSR.

 *

 * @return Old interrupt priority level.

 */

static ipl_t interrupts_disable(void)

{

    __u64 v;

    __asm__ volatile (

        "mov %0 = psr\n"

        "rsm %1\n"

        : "=r" (v)

        : "i" (PSR_I_MASK)

    );

    return (ipl_t) v;

}

/** Enable interrupts.

 *

 * Enable interrupts and return previous

 * value of PSR.

 *

 * @return Old interrupt priority level.

 */

static ipl_t interrupts_enable(void)

{

    __u64 v;

    __asm__ volatile (

        "mov %0 = psr\n"

        "ssm %1\n"

        ";;\n"

        "srlz.d\n"

        : "=r" (v)

        : "i" (PSR_I_MASK)

    );

    return (ipl_t) v;

}

/** Restore interrupt priority level.

 *

 * Restore PSR.

 *

 * @param ipl Saved interrupt priority level.

 */

static inline void interrupts_restore(ipl_t ipl)

{

    if (ipl & PSR_I_MASK)

        (void) interrupts_enable();

    else

        (void) interrupts_disable();

}

/** Return interrupt priority level.

 *

 * @return PSR.

 */

static inline ipl_t interrupts_read(void)

{

    return (ipl_t) psr_read();

}

/** Disable protection key checking. */

static inline void pk_disable(void)

{

    __asm__ volatile ("rsm %0\n" : : "i" (PSR_PK_MASK));

}

extern void cpu_halt(void);

extern void cpu_sleep(void);

extern void asm_delay_loop(__u32 t);

extern void switch_to_userspace(__address entry, __address sp, __address bsp, __u64 ipsr, __u64 rsc);

#endif