/* $NetBSD: cpu_ucode.c,v 1.13 2020/04/25 15:26:18 bouyer Exp $ */
/*
 * Copyright (c) 2012 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christoph Egger.
 *
 * 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.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: cpu_ucode.c,v 1.13 2020/04/25 15:26:18 bouyer Exp $");

#if defined(_KERNEL_OPT)
#include "opt_cpu_ucode.h"
#include "opt_xen.h"
#endif

#include <sys/param.h>
#include <sys/cpuio.h>
#include <sys/cpu.h>

#include <dev/firmload.h>

#include <machine/cpuvar.h>
#include <machine/cputypes.h>

#include <x86/cpu_ucode.h>

#ifdef XEN
#include <xen/include/public/xen.h>
#include <xen/hypervisor.h>
#endif

static struct cpu_ucode_softc ucode_softc;

int
cpu_ucode_get_version(struct cpu_ucode_version *data)
{
        union {
                struct cpu_ucode_version_amd a;
                struct cpu_ucode_version_intel1 i;
        } v;
        size_t l;
        int error;

        if (!data->data)
                return 0;

        switch (cpu_vendor) {
        case CPUVENDOR_AMD:
                l = sizeof(v.a);
                error = cpu_ucode_amd_get_version(data, &v, l);
                break;
        case CPUVENDOR_INTEL:
                l = sizeof(v.i);
                error = cpu_ucode_intel_get_version(data, &v, l);
                break;
        default:
                return EOPNOTSUPP;
        }

        if (error)
                return error;

        return copyout(&v, data->data, l);
}

int
cpu_ucode_md_open(firmware_handle_t *fwh, int loader_version, const char *fwname)
{
        switch (cpu_vendor) {
        case CPUVENDOR_AMD:
                return cpu_ucode_amd_firmware_open(fwh, fwname);
        case CPUVENDOR_INTEL:
                return cpu_ucode_intel_firmware_open(fwh, fwname);
        default:
                return EOPNOTSUPP;
        }
}

#ifndef XENPV
int
cpu_ucode_apply(const struct cpu_ucode *data)
{
        struct cpu_ucode_softc *sc = &ucode_softc;
        int error;

        sc->loader_version = data->loader_version;

        error = cpu_ucode_load(sc, data->fwname);
        if (error)
                return error;

        switch (cpu_vendor) {
        case CPUVENDOR_AMD:
                error = cpu_ucode_amd_apply(sc, data->cpu_nr);
                break;
        case CPUVENDOR_INTEL:
                error = cpu_ucode_intel_apply(sc, data->cpu_nr);
                break;
        default:
                error = EOPNOTSUPP;
        }

        if (sc->sc_blob != NULL)
                firmware_free(sc->sc_blob, sc->sc_blobsize);
        sc->sc_blob = NULL;
        sc->sc_blobsize = 0;
        return error;
}
#else
int
cpu_ucode_apply(const struct cpu_ucode *data)
{
        struct cpu_ucode_softc *sc = &ucode_softc;
        struct xen_platform_op op;
        int error;

        /* Xen updates all??? */
        if (data->cpu_nr != CPU_UCODE_ALL_CPUS)
                return EOPNOTSUPP;

        sc->loader_version = data->loader_version;
        error = cpu_ucode_load(sc, data->fwname);
        if (error)
                return error;

        op.cmd = XENPF_microcode_update;
        set_xen_guest_handle(op.u.microcode.data, sc->sc_blob);
        op.u.microcode.length = sc->sc_blobsize;

        error = -HYPERVISOR_platform_op(&op);

        if (sc->sc_blob)
                firmware_free(sc->sc_blob, sc->sc_blobsize);
        sc->sc_blob = NULL;
        sc->sc_blobsize = 0;
        return error;
}
#endif /* XEN */