/*-
 * Copyright (c) 2012 Andriy Gapon <avg@FreeBSD.org>.
 * All rights reserved.
 *
 * 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 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.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/ioccom.h>
#include <sys/cpuctl.h>

#include <machine/cpufunc.h>
#include <machine/specialreg.h>

#include <x86/ucode.h>

#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <err.h>

#include "cpucontrol.h"
#include "amd.h"

int
amd10h_probe(int fd)
{
        char vendor[13];
        cpuctl_cpuid_args_t idargs;
        uint32_t family;
        uint32_t signature;
        int error;

        idargs.level = 0;
        error = ioctl(fd, CPUCTL_CPUID, &idargs);
        if (error < 0) {
                WARN(0, "ioctl()");
                return (1);
        }
        ((uint32_t *)vendor)[0] = idargs.data[1];
        ((uint32_t *)vendor)[1] = idargs.data[3];
        ((uint32_t *)vendor)[2] = idargs.data[2];
        vendor[12] = '\0';
        if (strncmp(vendor, AMD_VENDOR_ID, sizeof(AMD_VENDOR_ID)) != 0)
                return (1);

        idargs.level = 1;
        error = ioctl(fd, CPUCTL_CPUID, &idargs);
        if (error < 0) {
                WARN(0, "ioctl()");
                return (1);
        }
        signature = idargs.data[0];
        family = ((signature >> 8) & 0x0f) + ((signature >> 20) & 0xff);
        if (family < 0x10)
                return (1);
        return (0);
}

void
amd10h_update(const struct ucode_update_params *params)
{
        cpuctl_cpuid_args_t idargs;
        cpuctl_msr_args_t msrargs;
        cpuctl_update_args_t args;
        const uint8_t *fw_image;
        const char *dev, *path;
        const void *selected_fw;
        size_t fw_size;
        size_t selected_size;
        uint32_t revision;
        uint32_t new_rev, old_rev;
        uint32_t signature;
        int devfd;
        int error;

        dev = params->dev_path;
        path = params->fw_path;
        devfd = params->devfd;
        fw_image = params->fwimage;
        fw_size = params->fwsize;

        assert(path);
        assert(dev);

        idargs.level = 1;
        error = ioctl(devfd, CPUCTL_CPUID, &idargs);
        if (error < 0) {
                WARN(0, "ioctl()");
                goto done;
        }
        signature = idargs.data[0];

        msrargs.msr = MSR_BIOS_SIGN;
        error = ioctl(devfd, CPUCTL_RDMSR, &msrargs);
        if (error < 0) {
                WARN(0, "ioctl(%s)", dev);
                goto done;
        }
        old_rev = revision = (uint32_t)msrargs.data;

        selected_fw = ucode_amd_find(path, signature, &revision, fw_image,
            fw_size, &selected_size);

        if (selected_fw != NULL) {
                WARNX(1, "selected ucode size is %zu", selected_size);
                fprintf(stderr,
                    "%s: updating cpu %s from rev %#x to rev %#x... ",
                    path, dev, old_rev, revision);

                args.data = __DECONST(void *, selected_fw);
                args.size = selected_size;
                error = ioctl(devfd, CPUCTL_UPDATE, &args);
                if (error < 0) {
                        fprintf(stderr, "failed.\n");
                        warn("ioctl()");
                        goto done;
                }
                fprintf(stderr, "done.\n");
        }

        msrargs.msr = MSR_BIOS_SIGN;
        error = ioctl(devfd, CPUCTL_RDMSR, &msrargs);
        if (error < 0) {
                WARN(0, "ioctl(%s)", dev);
                goto done;
        }
        new_rev = (uint32_t)msrargs.data;
        if (new_rev != revision)
                WARNX(0, "revision after update %#x", new_rev);

done:
        return;
}