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173 jermar 1
/*
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 * Copyright (C) 2005 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#ifndef __ia64_ASM_H__
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#define __ia64_ASM_H__
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#include <config.h>
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#include <arch/types.h>
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#include <arch/register.h>
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/** Return base address of current stack
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 *
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 * Return the base address of the current stack.
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 * The stack is assumed to be STACK_SIZE long.
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 * The stack must start on page boundary.
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 */
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static inline __address get_stack_base(void)
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{
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    __u64 v;
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    __asm__ volatile ("and %0 = %1, r12" : "=r" (v) : "r" (~(STACK_SIZE-1)));
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    return v;
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}
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/** Read IVA (Interruption Vector Address).
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 *
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 * @return Return location of interruption vector table.
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 */
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static inline __u64 iva_read(void)
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{
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    __u64 v;
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    __asm__ volatile ("mov %0 = cr.iva\n" : "=r" (v));
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    return v;
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}
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/** Write IVA (Interruption Vector Address) register.
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 *
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 * @param New location of interruption vector table.
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 */
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static inline void iva_write(__u64 v)
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{
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    __asm__ volatile ("mov cr.iva = %0\n" : : "r" (v));
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}
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/** Read IVR (External Interrupt Vector Register).
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 *
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 * @return Highest priority, pending, unmasked external interrupt vector.
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 */
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static inline __u64 ivr_read(void)
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{
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    __u64 v;
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    __asm__ volatile ("mov %0 = cr.ivr\n" : "=r" (v));
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    return v;
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}
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/** Write ITC (Interval Timer Counter) register.
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 *
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 * @param New counter value.
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 */
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static inline void itc_write(__u64 v)
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{
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    __asm__ volatile ("mov ar.itc = %0\n" : : "r" (v));
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}
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/** Read ITC (Interval Timer Counter) register.
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 *
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 * @return Current counter value.
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 */
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static inline __u64 itc_read(void)
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{
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    __u64 v;
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    __asm__ volatile ("mov %0 = ar.itc\n" : "=r" (v));
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    return v;
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}
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/** Write ITM (Interval Timer Match) register.
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 *
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 * @param New match value.
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 */
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static inline void itm_write(__u64 v)
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{
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    __asm__ volatile ("mov cr.itm = %0\n" : : "r" (v));
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}
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/** Read ITV (Interval Timer Vector) register.
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 *
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 * @return Current vector and mask bit.
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 */
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static inline __u64 itv_read(void)
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{
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    __u64 v;
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    __asm__ volatile ("mov %0 = cr.itv\n" : "=r" (v));
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    return v;
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}
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/** Write ITV (Interval Timer Vector) register.
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 *
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 * @param New vector and mask bit.
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 */
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static inline void itv_write(__u64 v)
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{
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    __asm__ volatile ("mov cr.itv = %0\n" : : "r" (v));
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}
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/** Write EOI (End Of Interrupt) register.
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 *
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 * @param This value is ignored.
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 */
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static inline void eoi_write(__u64 v)
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{
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    __asm__ volatile ("mov cr.eoi = %0\n" : : "r" (v));
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}
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/** Read TPR (Task Priority Register).
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 *
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 * @return Current value of TPR.
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 */
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static inline __u64 tpr_read(void)
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{
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    __u64 v;
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    __asm__ volatile ("mov %0 = cr.tpr\n"  : "=r" (v));
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    return v;
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}
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/** Write TPR (Task Priority Register).
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 *
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 * @param New value of TPR.
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 */
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static inline void tpr_write(__u64 v)
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{
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    __asm__ volatile ("mov cr.tpr = %0\n" : : "r" (v));
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}
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/** Disable interrupts.
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 *
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 * Disable interrupts and return previous
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 * value of PSR.
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 *
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 * @return Old interrupt priority level.
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 */
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static ipl_t interrupts_disable(void)
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{
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    __u64 v;
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    __asm__ volatile (
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        "mov %0 = psr\n"
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        "rsm %1\n"
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        : "=r" (v)
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        : "i" (PSR_I_MASK)
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    );
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    return (ipl_t) v;
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}
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/** Enable interrupts.
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 *
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 * Enable interrupts and return previous
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 * value of PSR.
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 *
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 * @return Old interrupt priority level.
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 */
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static ipl_t interrupts_enable(void)
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{
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    __u64 v;
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    __asm__ volatile (
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        "mov %0 = psr\n"
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        "ssm %1\n"
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        ";;\n"
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        "srlz.d\n"
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        : "=r" (v)
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        : "i" (PSR_I_MASK)
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    );
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    return (ipl_t) v;
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}
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/** Restore interrupt priority level.
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 *
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 * Restore PSR.
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 *
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 * @param ipl Saved interrupt priority level.
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 */
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static inline void interrupts_restore(ipl_t ipl)
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{
472 jermar 223
    if (ipl & PSR_I_MASK)
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        (void) interrupts_enable();
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    else
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        (void) interrupts_disable();
432 jermar 227
}
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/** Return interrupt priority level.
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 *
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 * @return PSR.
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 */
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static inline ipl_t interrupts_read(void)
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{
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    __u64 v;
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    __asm__ volatile ("mov %0 = psr\n" : "=r" (v));
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    return (ipl_t) v;
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}
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746 jermar 242
/** Disable protection key checking. */
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static inline void pk_disable(void)
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{
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    __asm__ volatile ("rsm %0\n" : : "i" (PSR_PK_MASK));
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}
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432 jermar 248
extern void cpu_halt(void);
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extern void cpu_sleep(void);
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extern void asm_delay_loop(__u32 t);
238 vana 251
 
173 jermar 252
#endif