/*      $OpenBSD: ipifuncs.c,v 1.37 2024/07/07 03:03:09 jsg Exp $       */
/* $NetBSD: ipifuncs.c,v 1.1.2.3 2000/06/26 02:04:06 sommerfeld Exp $ */

/*-
 * Copyright (c) 2000 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by RedBack Networks Inc.
 *
 * Author: Bill Sommerfeld
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``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 FOUNDATION OR CONTRIBUTORS
 * 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.
 */

/*
 * Interprocessor interrupt handlers.
 */

#include "npx.h"

#include <sys/param.h>
#include <sys/memrange.h>
#include <sys/systm.h>

#include <machine/cpufunc.h>
#include <machine/cpuvar.h>
#include <machine/intr.h>
#include <machine/atomic.h>
#include <machine/db_machdep.h>

void i386_ipi_nop(struct cpu_info *);
void i386_ipi_halt(struct cpu_info *);
void i386_ipi_wbinvd(struct cpu_info *);

#if NNPX > 0
void i386_ipi_synch_fpu(struct cpu_info *);
void i386_ipi_flush_fpu(struct cpu_info *);
#else
#define i386_ipi_synch_fpu NULL
#define i386_ipi_flush_fpu NULL
#endif

#ifdef MTRR
void i386_ipi_reload_mtrr(struct cpu_info *);
#else
#define i386_ipi_reload_mtrr 0
#endif

void (*ipifunc[I386_NIPI])(struct cpu_info *) =
{
        i386_ipi_halt,
        i386_ipi_nop,
        i386_ipi_flush_fpu,
        i386_ipi_synch_fpu,
        i386_ipi_reload_mtrr,
        NULL,
#ifdef DDB
        i386_ipi_db,
#else
        NULL,
#endif
        i386_setperf_ipi,
        i386_ipi_wbinvd,
};

void
i386_ipi_nop(struct cpu_info *ci)
{
}

void
i386_ipi_halt(struct cpu_info *ci)
{
        SCHED_ASSERT_UNLOCKED();
        KERNEL_ASSERT_UNLOCKED();

        npxsave_cpu(ci, 1);
        intr_disable();
        lapic_disable();
        wbinvd();
        ci->ci_flags &= ~CPUF_RUNNING;
        wbinvd();

        for(;;) {
                asm volatile("hlt");
        }
}

#if NNPX > 0
void
i386_ipi_flush_fpu(struct cpu_info *ci)
{
        if (ci->ci_fpsaveproc == ci->ci_fpcurproc)
                npxsave_cpu(ci, 0);
}

void
i386_ipi_synch_fpu(struct cpu_info *ci)
{
        if (ci->ci_fpsaveproc == ci->ci_fpcurproc)
                npxsave_cpu(ci, 1);
}
#endif

#ifdef MTRR
void
i386_ipi_reload_mtrr(struct cpu_info *ci)
{
        if (mem_range_softc.mr_op != NULL)
                mem_range_softc.mr_op->reload(&mem_range_softc);
}
#endif

void
i386_ipi_wbinvd(struct cpu_info *ci)
{
        wbinvd();
}

void
i386_send_ipi(struct cpu_info *ci, int ipimask)
{
        i386_atomic_setbits_l(&ci->ci_ipis, ipimask);

        /* Don't send IPI to cpu which isn't (yet) running. */
        if (!(ci->ci_flags & CPUF_RUNNING))
                return;

        i386_ipi(LAPIC_IPI_VECTOR, ci->ci_apicid, LAPIC_DLMODE_FIXED);

        return;
}

int
i386_fast_ipi(struct cpu_info *ci, int ipi)
{
        if (!(ci->ci_flags & CPUF_RUNNING))
                return (ENOENT);

        i386_ipi(ipi, ci->ci_apicid, LAPIC_DLMODE_FIXED);

        return 0;
}

void
i386_broadcast_ipi(int ipimask)
{
        struct cpu_info *ci, *self = curcpu();
        CPU_INFO_ITERATOR cii;
        int count = 0;

        CPU_INFO_FOREACH(cii, ci) {
                if (ci == self)
                        continue;
                if ((ci->ci_flags & CPUF_RUNNING) == 0)
                        continue;
                i386_atomic_setbits_l(&ci->ci_ipis, ipimask);
                count++;
        }
        if (!count)
                return;

        i386_ipi(LAPIC_IPI_VECTOR, LAPIC_DEST_ALLEXCL, LAPIC_DLMODE_FIXED); 
}

void
i386_ipi_handler(void)
{
        extern struct evcount ipi_count;
        struct cpu_info *ci = curcpu();
        u_int32_t pending;
        int bit;

        pending = i386_atomic_testset_ul(&ci->ci_ipis, 0);

        for (bit = 0; bit < I386_NIPI && pending; bit++) {
                if (pending & (1<<bit)) {
                        pending &= ~(1<<bit);
                        (*ipifunc[bit])(ci);
                        ipi_count.ec_count++;
                }
        }
}