/*
 * Copyright (c) 2008-2010 Rui Paulo
 * Copyright (c) 2006 Marcel Moolenaar
 * 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/cdefs.h>

#include <sys/disk.h>
#include <sys/param.h>
#include <sys/reboot.h>
#include <sys/boot.h>
#include <sys/consplat.h>
#include <sys/zfs_bootenv.h>
#include <stand.h>
#include <inttypes.h>
#include <string.h>
#include <setjmp.h>
#include <disk.h>

#include <efi.h>
#include <efilib.h>
#include <efichar.h>
#include <eficonsctl.h>
#include <efidevp.h>
#include <Guid/SmBios.h>
#include <Protocol/DevicePath.h>
#include <Protocol/LoadedImage.h>
#include <Protocol/SerialIo.h>
#include <Protocol/SimpleTextIn.h>
#include <Uefi/UefiGpt.h>

#include <uuid.h>

#include <bootstrap.h>
#include <gfx_fb.h>
#include <smbios.h>

#include <libzfs.h>
#include <efizfs.h>

#include "loader_efi.h"

struct arch_switch archsw;      /* MI/MD interface boundary */

EFI_GUID gEfiLoadedImageProtocolGuid = EFI_LOADED_IMAGE_PROTOCOL_GUID;
EFI_GUID gEfiSmbiosTableGuid = SMBIOS_TABLE_GUID;
EFI_GUID gEfiSmbios3TableGuid = SMBIOS3_TABLE_GUID;

extern void efi_getsmap(void);

/*
 * Number of seconds to wait for a keystroke before exiting with failure
 * in the event no currdev is found. -2 means always break, -1 means
 * never break, 0 means poll once and then reboot, > 0 means wait for
 * that many seconds. "fail_timeout" can be set in the environment as
 * well.
 */
static int fail_timeout = 5;

bool
efi_zfs_is_preferred(EFI_HANDLE *h)
{
        EFI_DEVICE_PATH *devpath, *dp, *node;
        HARDDRIVE_DEVICE_PATH *hd;
        bool ret;
        extern UINT64 start_sector;     /* from mb_header.S */

        /* This check is true for chainloader case. */
        if (h == boot_img->DeviceHandle)
                return (true);

        /*
         * Make sure the image was loaded from the hard disk.
         */
        devpath = efi_lookup_devpath(boot_img->DeviceHandle);
        if (devpath == NULL)
                return (false);
        node = efi_devpath_last_node(devpath);
        if (node == NULL)
                return (false);
        if (DevicePathType(node) != MEDIA_DEVICE_PATH ||
            (DevicePathSubType(node) != MEDIA_FILEPATH_DP &&
            DevicePathSubType(node) != MEDIA_HARDDRIVE_DP)) {
                return (false);
        }

        /*
         * XXX We ignore the MEDIA_FILEPATH_DP here for now as it is
         * used on arm and we do not support arm.
         */
        ret = false;
        dp = efi_devpath_trim(devpath);
        devpath = NULL;
        if (dp == NULL)
                goto done;

        devpath = efi_lookup_devpath(h);
        if (devpath == NULL)
                goto done;
        hd = (HARDDRIVE_DEVICE_PATH *)efi_devpath_last_node(devpath);
        if (hd == NULL) {
                devpath = NULL;
                goto done;
        }
        devpath = efi_devpath_trim(devpath);
        if (devpath == NULL)
                goto done;

        if (!efi_devpath_match(dp, devpath))
                goto done;

        /* It is the same disk, do we have partition start? */
        if (start_sector == 0)
                ret = true;
        else if (start_sector == hd->PartitionStart)
                ret = true;

done:
        free(dp);
        free(devpath);
        return (ret);
}

static bool
has_keyboard(void)
{
        EFI_STATUS status;
        EFI_DEVICE_PATH *path;
        EFI_HANDLE *hin;
        uint_t i, nhandles;
        bool retval = false;

        /*
         * Find all the handles that support the SIMPLE_TEXT_INPUT_PROTOCOL and
         * do the typical dance to get the right sized buffer.
         */
        status = efi_get_protocol_handles(&gEfiSimpleTextInProtocolGuid,
            &nhandles, &hin);
        if (EFI_ERROR(status))
                return (retval);

        /*
         * Look at each of the handles. If it supports the device path protocol,
         * use it to get the device path for this handle. Then see if that
         * device path matches either the USB device path for keyboards or the
         * legacy device path for keyboards.
         */
        for (i = 0; i < nhandles; i++) {
                status = OpenProtocolByHandle(hin[i],
                    &gEfiDevicePathProtocolGuid, (void **)&path);
                if (EFI_ERROR(status))
                        continue;

                while (!IsDevicePathEnd(path)) {
                        /*
                         * Check for the ACPI keyboard node. All PNP3xx nodes
                         * are keyboards of different flavors. Note: It is
                         * unclear of there's always a keyboard node when
                         * there's a keyboard controller, or if there's only one
                         * when a keyboard is detected at boot.
                         */
                        if (DevicePathType(path) == ACPI_DEVICE_PATH &&
                            (DevicePathSubType(path) == ACPI_DP ||
                            DevicePathSubType(path) == ACPI_EXTENDED_DP)) {
                                ACPI_HID_DEVICE_PATH  *acpi;

                                acpi = (ACPI_HID_DEVICE_PATH *)(void *)path;
                                if ((EISA_ID_TO_NUM(acpi->HID) & 0xff00) ==
                                    0x300 &&
                                    (acpi->HID & 0xffff) == PNP_EISA_ID_CONST) {
                                        retval = true;
                                        goto out;
                                }
                        /*
                         * Check for USB keyboard node, if present. Unlike a
                         * PS/2 keyboard, these definitely only appear when
                         * connected to the system.
                         */
                        } else if (DevicePathType(path) ==
                            MESSAGING_DEVICE_PATH &&
                            DevicePathSubType(path) == MSG_USB_CLASS_DP) {
                                USB_CLASS_DEVICE_PATH *usb;

                                /*
                                 * Check for:
                                 * DeviceClass: HID
                                 * DeviceSubClass: Boot devices
                                 * DeviceProtocol: Boot keyboards
                                 */
                                usb = (USB_CLASS_DEVICE_PATH *)(void *)path;
                                if (usb->DeviceClass == 3 &&
                                    usb->DeviceSubClass == 1 &&
                                    usb->DeviceProtocol == 1) {
                                        retval = true;
                                        goto out;
                                }
                        }
                        path = NextDevicePathNode(path);
                }
        }
out:
        free(hin);
        return (retval);
}

static void
set_currdev(const char *devname)
{

        /*
         * Don't execute hooks here; we may need to try setting these more than
         * once here if we're probing for the ZFS pool we're supposed to boot.
         * The currdev hook is intended to just validate user input anyways,
         * while the loaddev hook makes it immutable once we've determined what
         * the proper currdev is.
         */
        env_setenv("currdev", EV_VOLATILE | EV_NOHOOK, devname, efi_setcurrdev,
            env_nounset);
        env_setenv("loaddev", EV_VOLATILE | EV_NOHOOK, devname, env_noset,
            env_nounset);
}

static void
set_currdev_devdesc(struct devdesc *currdev)
{
        char *devname;

        devname = efi_fmtdev(currdev);

        printf("Setting currdev to %s\n", devname);
        set_currdev(devname);
}

static void
set_currdev_devsw(struct devsw *dev, int unit)
{
        struct devdesc currdev;

        currdev.d_dev = dev;
        currdev.d_unit = unit;

        set_currdev_devdesc(&currdev);
}

static void
set_currdev_pdinfo(pdinfo_t *dp)
{

        /*
         * Disks are special: they have partitions. if the parent
         * pointer is non-null, we're a partition not a full disk
         * and we need to adjust currdev appropriately.
         */
        if (dp->pd_devsw->dv_type == DEVT_DISK) {
                struct disk_devdesc currdev;

                currdev.dd.d_dev = dp->pd_devsw;
                if (dp->pd_parent == NULL) {
                        currdev.dd.d_unit = dp->pd_unit;
                        currdev.d_slice = D_SLICENONE;
                        currdev.d_partition = D_PARTNONE;
                } else {
                        currdev.dd.d_unit = dp->pd_parent->pd_unit;
                        currdev.d_slice = dp->pd_unit;
                        currdev.d_partition = D_PARTISGPT; /* Assumes GPT */
                }
                set_currdev_devdesc((struct devdesc *)&currdev);
        } else {
                set_currdev_devsw(dp->pd_devsw, dp->pd_unit);
        }
}

static bool
sanity_check_currdev(void)
{
        struct stat st;

        return (stat("/boot/defaults/loader.conf", &st) == 0);
}

static bool
probe_zfs_currdev(uint64_t guid)
{
        struct zfs_devdesc currdev;
        char *bootonce;
        bool rv;

        currdev.dd.d_dev = &zfs_dev;
        currdev.dd.d_unit = 0;
        currdev.pool_guid = guid;
        currdev.root_guid = 0;
        set_currdev_devdesc((struct devdesc *)&currdev);

        rv = sanity_check_currdev();
        if (rv) {
                bootonce = malloc(VDEV_PAD_SIZE);
                if (bootonce != NULL) {
                        if (zfs_get_bootonce(&currdev, OS_BOOTONCE, bootonce,
                            VDEV_PAD_SIZE) == 0) {
                                printf("zfs bootonce: %s\n", bootonce);
                                set_currdev(bootonce);
                                setenv("zfs-bootonce", bootonce, 1);
                        }
                        free(bootonce);
                        (void) zfs_attach_nvstore(&currdev);
                } else {
                        printf("Failed to process bootonce data: %s\n",
                            strerror(errno));
                }
        }
        return (rv);
}

static bool
try_as_currdev(pdinfo_t *pp)
{
        uint64_t guid;

        /*
         * If there's a zpool on this device, try it as a ZFS
         * filesystem, which has somewhat different setup than all
         * other types of fs due to imperfect loader integration.
         * This all stems from ZFS being both a device (zpool) and
         * a filesystem, plus the boot env feature.
         */
        if (efizfs_get_guid_by_handle(pp->pd_handle, &guid))
                return (probe_zfs_currdev(guid));

        /*
         * All other filesystems just need the pdinfo
         * initialized in the standard way.
         */
        set_currdev_pdinfo(pp);
        return (sanity_check_currdev());
}

static bool
find_currdev(EFI_LOADED_IMAGE_PROTOCOL *img)
{
        pdinfo_t *dp, *pp;
        EFI_DEVICE_PATH *devpath, *copy;
        EFI_HANDLE h;
        CHAR16 *text;
        struct devsw *dev;
        int unit;
        uint64_t extra;

        /*
         * Did efi_zfs_probe() detect the boot pool? If so, use the zpool
         * it found, if it's sane. ZFS is the only thing that looks for
         * disks and pools to boot.
         */
        if (pool_guid != 0) {
                printf("Trying ZFS pool\n");
                if (probe_zfs_currdev(pool_guid))
                        return (true);
        }

        /*
         * Try to find the block device by its handle based on the
         * image we're booting. If we can't find a sane partition,
         * search all the other partitions of the disk. We do not
         * search other disks because it's a violation of the UEFI
         * boot protocol to do so. We fail and let UEFI go on to
         * the next candidate.
         */
        dp = efiblk_get_pdinfo_by_handle(img->DeviceHandle);
        if (dp != NULL) {
                text = efi_devpath_name(dp->pd_devpath);
                if (text != NULL) {
                        printf("Trying ESP: %S\n", text);
                        efi_free_devpath_name(text);
                }
                set_currdev_pdinfo(dp);
                if (sanity_check_currdev())
                        return (true);
                if (dp->pd_parent != NULL) {
                        dp = dp->pd_parent;
                        STAILQ_FOREACH(pp, &dp->pd_part, pd_link) {
                                text = efi_devpath_name(pp->pd_devpath);
                                if (text != NULL) {
                                        printf("And now the part: %S\n", text);
                                        efi_free_devpath_name(text);
                                }
                                /*
                                 * Roll up the ZFS special case
                                 * for those partitions that have
                                 * zpools on them
                                 */
                                if (try_as_currdev(pp))
                                        return (true);
                        }
                }
        }

        /*
         * Try the device handle from our loaded image first.  If that
         * fails, use the device path from the loaded image and see if
         * any of the nodes in that path match one of the enumerated
         * handles. Currently, this handle list is only for netboot.
         */
        if (efi_handle_lookup(img->DeviceHandle, &dev, &unit, &extra) == 0) {
                set_currdev_devsw(dev, unit);
                if (sanity_check_currdev())
                        return (true);
        }

        copy = NULL;
        devpath = efi_lookup_image_devpath(IH);
        while (devpath != NULL) {
                h = efi_devpath_handle(devpath);
                if (h == NULL)
                        break;

                free(copy);
                copy = NULL;

                if (efi_handle_lookup(h, &dev, &unit, &extra) == 0) {
                        set_currdev_devsw(dev, unit);
                        if (sanity_check_currdev())
                                return (true);
                }

                devpath = efi_lookup_devpath(h);
                if (devpath != NULL) {
                        copy = efi_devpath_trim(devpath);
                        devpath = copy;
                }
        }
        free(copy);

        return (false);
}

static bool
interactive_interrupt(const char *msg)
{
        time_t now, then, last;

        last = 0;
        now = then = getsecs();
        printf("%s\n", msg);
        if (fail_timeout == -2)                 /* Always break to OK */
                return (true);
        if (fail_timeout == -1)                 /* Never break to OK */
                return (false);
        do {
                if (last != now) {
                        printf("press any key to interrupt reboot "
                            "in %d seconds\r",
                            fail_timeout - (int)(now - then));
                        last = now;
                }

                /* XXX no pause or timeout wait for char */
                if (ischar())
                        return (true);
                now = getsecs();
        } while (now - then < fail_timeout);
        return (false);
}

static void
setenv_int(const char *key, int val)
{
        char buf[20];

        (void) snprintf(buf, sizeof (buf), "%d", val);
        (void) setenv(key, buf, 1);
}

/*
 * Parse ConOut (the list of consoles active) and see if we can find a
 * serial port and/or a video port. It would be nice to also walk the
 * ACPI name space to map the UID for the serial port to a port. The
 * latter is especially hard.
 */
static int
parse_uefi_con_out(void)
{
        int how, rv;
        int vid_seen = 0, com_seen = 0, seen = 0;
        size_t sz;
        char buf[4096], *ep;
        EFI_DEVICE_PATH *node;
        ACPI_HID_DEVICE_PATH *acpi;
        UART_DEVICE_PATH *uart;
        bool pci_pending = false;

        how = 0;
        sz = sizeof (buf);
        rv = efi_global_getenv("ConOut", buf, &sz);
        if (rv != EFI_SUCCESS)
                rv = efi_global_getenv("ConOutDev", buf, &sz);
        if (rv != EFI_SUCCESS) {
                /*
                 * If we don't have any ConOut default to video.
                 * non-server systems may not have serial.
                 */
                goto out;
        }
        ep = buf + sz;
        node = (EFI_DEVICE_PATH *)buf;
        while ((char *)node < ep) {
                if (IsDevicePathEndType(node)) {
                        if (pci_pending && vid_seen == 0)
                                vid_seen = ++seen;
                }
                pci_pending = false;
                if (DevicePathType(node) == ACPI_DEVICE_PATH &&
                    (DevicePathSubType(node) == ACPI_DP ||
                    DevicePathSubType(node) == ACPI_EXTENDED_DP)) {
                        /* Check for Serial node */
                        acpi = (void *)node;
                        if (EISA_ID_TO_NUM(acpi->HID) == 0x501) {
                                setenv_int("efi_8250_uid", acpi->UID);
                                com_seen = ++seen;
                        }
                } else if (DevicePathType(node) == MESSAGING_DEVICE_PATH &&
                    DevicePathSubType(node) == MSG_UART_DP) {
                        com_seen = ++seen;
                        uart = (void *)node;
                        setenv_int("efi_com_speed", uart->BaudRate);
                } else if (DevicePathType(node) == ACPI_DEVICE_PATH &&
                    DevicePathSubType(node) == ACPI_ADR_DP) {
                        /* Check for AcpiAdr() Node for video */
                        vid_seen = ++seen;
                } else if (DevicePathType(node) == HARDWARE_DEVICE_PATH &&
                    DevicePathSubType(node) == HW_PCI_DP) {
                        /*
                         * Note, vmware fusion has a funky console device
                         *      PciRoot(0x0)/Pci(0xf,0x0)
                         * which we can only detect at the end since we also
                         * have to cope with:
                         *      PciRoot(0x0)/Pci(0x1f,0x0)/Serial(0x1)
                         * so only match it if it's last.
                         */
                        pci_pending = true;
                }
                node = NextDevicePathNode(node); /* Skip the end node */
        }

        /*
         * Truth table for RB_MULTIPLE | RB_SERIAL
         * Value                Result
         * 0                    Use only video console
         * RB_SERIAL            Use only serial console
         * RB_MULTIPLE          Use both video and serial console
         *                      (but video is primary so gets rc messages)
         * both                 Use both video and serial console
         *                      (but serial is primary so gets rc messages)
         *
         * Try to honor this as best we can. If only one of serial / video
         * found, then use that. Otherwise, use the first one we found.
         * This also implies if we found nothing, default to video.
         */
        how = 0;
        if (vid_seen && com_seen) {
                how |= RB_MULTIPLE;
                if (com_seen < vid_seen)
                        how |= RB_SERIAL;
        } else if (com_seen)
                how |= RB_SERIAL;
out:
        return (how);
}

caddr_t
ptov(uintptr_t x)
{
        return ((caddr_t)x);
}

static int
efi_serial_get_uid(EFI_DEVICE_PATH *devpath)
{
        ACPI_HID_DEVICE_PATH  *acpi;

        while (!IsDevicePathEnd(devpath)) {
                if (DevicePathType(devpath) == ACPI_DEVICE_PATH &&
                    (DevicePathSubType(devpath) == ACPI_DP ||
                    DevicePathSubType(devpath) == ACPI_EXTENDED_DP)) {
                        acpi = (ACPI_HID_DEVICE_PATH *)devpath;
                        if (EISA_ID_TO_NUM(acpi->HID) == 0x501) {
                                return (acpi->UID);
                        }
                }

                devpath = NextDevicePathNode(devpath);
        }
        return (-1);
}

/*
 * Walk serialio protocol handle array and find index for serial console
 * device. The problem is, we check for acpi UID value, but we can not be sure,
 * if it will start from 0 or 1.
 */
static const char *
uefi_serial_console(void)
{
        EFI_STATUS status;
        EFI_HANDLE *handles;
        uint_t i, nhandles;
        unsigned long uid, lowest;
        char *env, *ep;

        env = getenv("efi_8250_uid");
        if (env == NULL)
                return (NULL);
        (void) unsetenv("efi_8250_uid");
        errno = 0;
        uid = strtoul(env, &ep, 10);
        if (errno != 0 || *ep != '\0')
                return (NULL);

        /* if uid is 0, this is first serial port */
        if (uid == 0)
                return ("ttya");

        status = efi_get_protocol_handles(&gEfiSerialIoProtocolGuid,
            &nhandles, &handles);
        if (EFI_ERROR(status)) {
                return (NULL);
        }

        lowest = 255;   /* high enough value */
        for (i = 0; i < nhandles; i++) {
                EFI_DEVICE_PATH *devpath;
                unsigned long _uid;

                devpath = efi_lookup_devpath(handles[i]);
                _uid = efi_serial_get_uid(devpath);
                if (_uid < lowest)
                        lowest = _uid;
        }
        free(handles);
        switch (uid - lowest) {
        case 0:
                return ("ttya");
        case 1:
                return ("ttyb");
        case 2:
                return ("ttyc");
        case 3:
                return ("ttyd");
        }
        return (NULL);
}

EFI_STATUS
main(int argc, CHAR16 *argv[])
{
        char var[128];
        int i, j, howto;
        bool vargood;
        void *ptr;
        bool has_kbd;
        char *s;
        const char *serial;
        EFI_DEVICE_PATH *imgpath;
        CHAR16 *text;
        EFI_STATUS status;
        UINT16 boot_current;
        size_t sz;
        UINT16 boot_order[100];

        archsw.arch_autoload = efi_autoload;
        archsw.arch_getdev = efi_getdev;
        archsw.arch_copyin = efi_copyin;
        archsw.arch_copyout = efi_copyout;
        archsw.arch_readin = efi_readin;
        archsw.arch_loadaddr = efi_loadaddr;
        archsw.arch_free_loadaddr = efi_free_loadaddr;
#if defined(__amd64) || defined(__i386)
        archsw.arch_hypervisor = x86_hypervisor;
#endif
        /* Note this needs to be set before ZFS init. */
        archsw.arch_zfs_probe = efi_zfs_probe;

        /*
         * XXX Chicken-and-egg problem; we want to have console output
         * early, but some console attributes may depend on reading from
         * eg. the boot device, which we can't do yet.  We can use
         * printf() etc. once this is done.
         */
        setenv("console", "text", 1);
        howto = parse_uefi_con_out();
        serial = uefi_serial_console();
        cons_probe();
        efi_getsmap();

        if ((s = getenv("efi_com_speed")) != NULL) {
                char *name;

                (void) snprintf(var, sizeof (var), "%s,8,n,1,-", s);
                if (asprintf(&name, "%s-mode", serial) > 0) {
                        (void) setenv(name, var, 1);
                        free(name);
                }
                if (asprintf(&name, "%s-spcr-mode", serial) > 0) {
                        (void) setenv(name, var, 1);
                        free(name);
                }
                (void) unsetenv("efi_com_speed");
        }

        /* Init the time source */
        efi_time_init();

        /*
         * Initialise the block cache. Set the upper limit.
         */
        bcache_init(32768, 512);

        has_kbd = has_keyboard();

        /*
         * Parse the args to set the console settings, etc
         * iPXE may be setup to pass these in. Or the optional argument in the
         * boot environment was used to pass these arguments in (in which case
         * neither /boot.config nor /boot/config are consulted).
         *
         * Loop through the args, and for each one that contains an '=' that is
         * not the first character, add it to the environment.  This allows
         * loader and kernel env vars to be passed on the command line.  Convert
         * args from UCS-2 to ASCII (16 to 8 bit) as they are copied (though
         * this method is flawed for non-ASCII characters).
         */
        for (i = 1; i < argc; i++) {
                if (argv[i][0] == '-') {
                        for (j = 1; argv[i][j] != 0; j++) {
                                int ch;

                                ch = argv[i][j];
                                switch (ch) {
                                case 'a':
                                        howto |= RB_ASKNAME;
                                        break;
                                case 'd':
                                        howto |= RB_KDB;
                                        break;
                                case 'D':
                                        howto |= RB_MULTIPLE;
                                        break;
                                case 'h':
                                        howto |= RB_SERIAL;
                                        break;
                                case 'm':
                                        howto |= RB_MUTE;
                                        break;
                                case 'p':
                                        howto |= RB_PAUSE;
                                        break;
                                case 'P':
                                        if (!has_kbd) {
                                                howto |= RB_SERIAL;
                                                howto |= RB_MULTIPLE;
                                        }
                                        break;
                                case 'r':
                                        howto |= RB_DFLTROOT;
                                        break;
                                case 's':
                                        howto |= RB_SINGLE;
                                        break;
                                case 'S':
                                        if (argv[i][j + 1] == 0) {
                                                if (i + 1 == argc) {
                                                        strncpy(var, "115200",
                                                            sizeof (var));
                                                } else {
                                                        CHAR16 *ptr;
                                                        ptr = &argv[i + 1][0];
                                                        cpy16to8(ptr, var,
                                                            sizeof (var));
                                                }
                                                i++;
                                        } else {
                                                cpy16to8(&argv[i][j + 1], var,
                                                    sizeof (var));
                                        }
                                        strncat(var, ",8,n,1,-", sizeof (var));
                                        setenv("ttya-mode", var, 1);
                                        break;
                                case 'v':
                                        howto |= RB_VERBOSE;
                                        break;
                                }
                        }
                } else {
                        vargood = false;
                        for (j = 0; argv[i][j] != 0; j++) {
                                if (j == sizeof (var)) {
                                        vargood = false;
                                        break;
                                }
                                if (j > 0 && argv[i][j] == '=')
                                        vargood = true;
                                var[j] = (char)argv[i][j];
                        }
                        if (vargood) {
                                var[j] = 0;
                                putenv(var);
                        }
                }
        }
        for (i = 0; howto_names[i].ev != NULL; i++)
                if (howto & howto_names[i].mask)
                        setenv(howto_names[i].ev, "YES", 1);

        /*
         * XXX we need fallback to this stuff after looking at the ConIn,
         * ConOut and ConErr variables.
         */
        if (howto & RB_MULTIPLE) {
                if (howto & RB_SERIAL)
                        (void) snprintf(var, sizeof (var), "%s text", serial);
                else
                        (void) snprintf(var, sizeof (var), "text %s", serial);
        } else if (howto & RB_SERIAL) {
                (void) snprintf(var, sizeof (var), "%s", serial);
        } else {
                (void) snprintf(var, sizeof (var), "text");
        }
        (void) setenv("console", var, 1);

        if ((s = getenv("fail_timeout")) != NULL)
                fail_timeout = strtol(s, NULL, 10);

        /*
         * Scan the BLOCK IO MEDIA handles then
         * march through the device switch probing for things.
         */
        if ((i = efipart_inithandles()) == 0) {
                for (i = 0; devsw[i] != NULL; i++)
                        if (devsw[i]->dv_init != NULL)
                                (devsw[i]->dv_init)();
        } else
                printf("efipart_inithandles failed %d, expect failures", i);

        printf("Command line arguments:");
        for (i = 0; i < argc; i++) {
                printf(" %S", argv[i]);
        }
        printf("\n");

        printf("Image base: 0x%lx\n", (unsigned long)boot_img->ImageBase);
        printf("EFI version: %d.%02d\n", ST->Hdr.Revision >> 16,
            ST->Hdr.Revision & 0xffff);
        printf("EFI Firmware: %S (rev %d.%02d)\n", ST->FirmwareVendor,
            ST->FirmwareRevision >> 16, ST->FirmwareRevision & 0xffff);

        printf("\n%s", bootprog_info);

        /* Determine the devpath of our image so we can prefer it. */
        text = efi_devpath_name(boot_img->FilePath);
        if (text != NULL) {
                printf("   Load Path: %S\n", text);
                efi_setenv_illumos_wcs("LoaderPath", text);
                efi_free_devpath_name(text);
        }

        status = OpenProtocolByHandle(boot_img->DeviceHandle,
            &gEfiDevicePathProtocolGuid, (void **)&imgpath);
        if (status == EFI_SUCCESS) {
                text = efi_devpath_name(imgpath);
                if (text != NULL) {
                        printf("   Load Device: %S\n", text);
                        efi_setenv_illumos_wcs("LoaderDev", text);
                        efi_free_devpath_name(text);
                }
        }

        boot_current = 0;
        sz = sizeof (boot_current);
        efi_global_getenv("BootCurrent", &boot_current, &sz);
        printf("   BootCurrent: %04x\n", boot_current);

        sz = sizeof (boot_order);
        efi_global_getenv("BootOrder", &boot_order, &sz);
        printf("   BootOrder:");
        for (i = 0; i < sz / sizeof (boot_order[0]); i++)
                printf(" %04x%s", boot_order[i],
                    boot_order[i] == boot_current ? "[*]" : "");
        printf("\n");

        /*
         * Disable the watchdog timer. By default the boot manager sets
         * the timer to 5 minutes before invoking a boot option. If we
         * want to return to the boot manager, we have to disable the
         * watchdog timer and since we're an interactive program, we don't
         * want to wait until the user types "quit". The timer may have
         * fired by then. We don't care if this fails. It does not prevent
         * normal functioning in any way...
         */
        BS->SetWatchdogTimer(0, 0, 0, NULL);

        /*
         * Try and find a good currdev based on the image that was booted.
         * It might be desirable here to have a short pause to allow falling
         * through to the boot loader instead of returning instantly to follow
         * the boot protocol and also allow an escape hatch for users wishing
         * to try something different.
         */
        if (!find_currdev(boot_img))
                if (!interactive_interrupt("Failed to find bootable partition"))
                        return (EFI_NOT_FOUND);

        autoload_font(false);           /* Set up the font list for console. */
        efi_init_environment();
        bi_isadir();                    /* set ISADIR */
        acpi_detect();

        if ((ptr = efi_get_table(&gEfiSmbios3TableGuid)) == NULL)
                ptr = efi_get_table(&gEfiSmbiosTableGuid);
        smbios_detect(ptr);

        interact(NULL);                 /* doesn't return */

        return (EFI_SUCCESS);           /* keep compiler happy */
}

COMMAND_SET(reboot, "reboot", "reboot the system", command_reboot);

static void
fw_setup(void)
{
        uint64_t os_indications;
        size_t size;
        EFI_STATUS status;

        size = sizeof (os_indications);
        status = efi_global_getenv("OsIndicationsSupported",
            &os_indications, &size);
        if (EFI_ERROR(status) || size != sizeof (os_indications) ||
            (os_indications & EFI_OS_INDICATIONS_BOOT_TO_FW_UI) == 0) {
                printf("Booting to Firmware UI is not supported in "
                    "this system.");
                for (int i = 0; i < 3; i++) {
                        delay(1000 * 1000); /* 1 second */
                        if (ischar())
                                break;
                }
                return;
        }

        os_indications = EFI_OS_INDICATIONS_BOOT_TO_FW_UI;

        status = efi_global_setenv("OsIndications", &os_indications,
            sizeof (os_indications));
}

static int
command_reboot(int argc, char *argv[])
{
        int i, ch;
        bool fw = false;

        optind = 1;
        optreset = 1;

        while ((ch = getopt(argc, argv, "fh")) != -1) {
                switch (ch) {
                case 'f':
                        fw = true;
                        break;
                case 'h':
                        printf("Usage: reboot [-f]\n");
                        return (CMD_OK);
                case '?':
                default:
                        return (CMD_OK);
                }
        }

        if (fw || getenv("BOOT_TO_FW_UI") != NULL)
                fw_setup();

        for (i = 0; devsw[i] != NULL; ++i)
                if (devsw[i]->dv_cleanup != NULL)
                        (devsw[i]->dv_cleanup)();

        RS->ResetSystem(EfiResetCold, EFI_SUCCESS, 0, NULL);

        /* NOTREACHED */
        return (CMD_ERROR);
}

COMMAND_SET(poweroff, "poweroff", "power off the system", command_poweroff);

static int
command_poweroff(int argc __unused, char *argv[] __unused)
{
        int i;

        for (i = 0; devsw[i] != NULL; ++i)
                if (devsw[i]->dv_cleanup != NULL)
                        (devsw[i]->dv_cleanup)();

        RS->ResetSystem(EfiResetShutdown, EFI_SUCCESS, 0, NULL);

        /* NOTREACHED */
        return (CMD_ERROR);
}

COMMAND_SET(memmap, "memmap", "print memory map", command_memmap);

static int
command_memmap(int argc __unused, char *argv[] __unused)
{
        UINTN sz;
        EFI_MEMORY_DESCRIPTOR *map, *p;
        UINTN key, dsz;
        UINT32 dver;
        EFI_STATUS status;
        int i, ndesc;
        int rv = 0;
        char line[80];

        sz = 0;
        status = BS->GetMemoryMap(&sz, 0, &key, &dsz, &dver);
        if (status != EFI_BUFFER_TOO_SMALL) {
                printf("Can't determine memory map size\n");
                return (CMD_ERROR);
        }
        map = malloc(sz);
        status = BS->GetMemoryMap(&sz, map, &key, &dsz, &dver);
        if (EFI_ERROR(status)) {
                printf("Can't read memory map\n");
                return (CMD_ERROR);
        }

        ndesc = sz / dsz;
        snprintf(line, 80, "%23s %12s %12s %8s %4s\n",
            "Type", "Physical", "Virtual", "#Pages", "Attr");
        pager_open();
        rv = pager_output(line);
        if (rv) {
                pager_close();
                return (CMD_OK);
        }

        for (i = 0, p = map; i < ndesc;
            i++, p = NextMemoryDescriptor(p, dsz)) {
                snprintf(line, 80, "%23s %012jx %012jx %08jx ",
                    efi_memory_type(p->Type), p->PhysicalStart,
                    p->VirtualStart, p->NumberOfPages);
                rv = pager_output(line);
                if (rv)
                        break;

                if (p->Attribute & EFI_MEMORY_UC)
                        printf("UC ");
                if (p->Attribute & EFI_MEMORY_WC)
                        printf("WC ");
                if (p->Attribute & EFI_MEMORY_WT)
                        printf("WT ");
                if (p->Attribute & EFI_MEMORY_WB)
                        printf("WB ");
                if (p->Attribute & EFI_MEMORY_UCE)
                        printf("UCE ");
                if (p->Attribute & EFI_MEMORY_WP)
                        printf("WP ");
                if (p->Attribute & EFI_MEMORY_RP)
                        printf("RP ");
                if (p->Attribute & EFI_MEMORY_XP)
                        printf("XP ");
                if (p->Attribute & EFI_MEMORY_NV)
                        printf("NV ");
                if (p->Attribute & EFI_MEMORY_MORE_RELIABLE)
                        printf("MR ");
                if (p->Attribute & EFI_MEMORY_RO)
                        printf("RO ");
                rv = pager_output("\n");
                if (rv)
                        break;
        }

        pager_close();
        return (CMD_OK);
}

COMMAND_SET(configuration, "configuration", "print configuration tables",
    command_configuration);

static int
command_configuration(int argc __unused, char *argv[] __unused)
{
        UINTN i;
        char *name;

        printf("NumberOfTableEntries=%lu\n",
            (unsigned long)ST->NumberOfTableEntries);
        for (i = 0; i < ST->NumberOfTableEntries; i++) {
                EFI_GUID *guid;

                printf("  ");
                guid = &ST->ConfigurationTable[i].VendorGuid;

                if (efi_guid_to_name(guid, &name) == true) {
                        printf(name);
                        free(name);
                } else {
                        printf("Error while translating UUID to name");
                }
                printf(" at %p\n", ST->ConfigurationTable[i].VendorTable);
        }

        return (CMD_OK);
}


COMMAND_SET(mode, "mode", "change or display EFI text modes", command_mode);

static int
command_mode(int argc, char *argv[])
{
        UINTN cols, rows;
        unsigned int mode;
        int i;
        char *cp;
        EFI_STATUS status;
        SIMPLE_TEXT_OUTPUT_INTERFACE *conout;
        EFI_CONSOLE_CONTROL_SCREEN_MODE sm;

        if (plat_stdout_is_framebuffer())
                sm = EfiConsoleControlScreenGraphics;
        else
                sm = EfiConsoleControlScreenText;

        conout = ST->ConOut;

        if (argc > 1) {
                mode = strtol(argv[1], &cp, 0);
                if (cp[0] != '\0') {
                        printf("Invalid mode\n");
                        return (CMD_ERROR);
                }
                status = conout->QueryMode(conout, mode, &cols, &rows);
                if (EFI_ERROR(status)) {
                        printf("invalid mode %d\n", mode);
                        return (CMD_ERROR);
                }
                status = conout->SetMode(conout, mode);
                if (EFI_ERROR(status)) {
                        printf("couldn't set mode %d\n", mode);
                        return (CMD_ERROR);
                }
                plat_cons_update_mode(sm);
                return (CMD_OK);
        }

        printf("Current mode: %d\n", conout->Mode->Mode);
        for (i = 0; i <= conout->Mode->MaxMode; i++) {
                status = conout->QueryMode(conout, i, &cols, &rows);
                if (EFI_ERROR(status))
                        continue;
                printf("Mode %d: %u columns, %u rows\n", i, (unsigned)cols,
                    (unsigned)rows);
        }

        if (i != 0)
                printf("Select a mode with the command \"mode <number>\"\n");

        return (CMD_OK);
}

COMMAND_SET(lsefi, "lsefi", "list EFI handles", command_lsefi);

static int
command_lsefi(int argc __unused, char *argv[] __unused)
{
        char *name;
        EFI_HANDLE *buffer = NULL;
        EFI_HANDLE handle;
        UINTN bufsz = 0, i, j;
        EFI_STATUS status;
        int ret = 0;

        status = BS->LocateHandle(AllHandles, NULL, NULL, &bufsz, buffer);
        if (status != EFI_BUFFER_TOO_SMALL) {
                snprintf(command_errbuf, sizeof (command_errbuf),
                    "unexpected error: %lld", (long long)status);
                return (CMD_ERROR);
        }
        if ((buffer = malloc(bufsz)) == NULL) {
                sprintf(command_errbuf, "out of memory");
                return (CMD_ERROR);
        }

        status = BS->LocateHandle(AllHandles, NULL, NULL, &bufsz, buffer);
        if (EFI_ERROR(status)) {
                free(buffer);
                snprintf(command_errbuf, sizeof (command_errbuf),
                    "LocateHandle() error: %lld", (long long)status);
                return (CMD_ERROR);
        }

        pager_open();
        for (i = 0; i < (bufsz / sizeof (EFI_HANDLE)); i++) {
                UINTN nproto = 0;
                EFI_GUID **protocols = NULL;
                EFI_DEVICE_PATH *dp;
                CHAR16 *text;

                handle = buffer[i];
                printf("Handle %p", handle);
                if (pager_output("\n"))
                        break;

                ret = 0;
                dp = efi_lookup_devpath(handle);
                if (dp != NULL) {
                        text = efi_devpath_name(dp);
                        if (text != NULL) {
                                printf("  %S", text);
                                efi_free_devpath_name(text);
                                ret = pager_output("\n");
                        }
                        efi_close_devpath(handle);
                }
                if (ret != 0)
                        break;

                status = BS->ProtocolsPerHandle(handle, &protocols, &nproto);
                if (EFI_ERROR(status)) {
                        snprintf(command_errbuf, sizeof (command_errbuf),
                            "ProtocolsPerHandle() error: %lld",
                            (long long)status);
                        continue;
                }

                for (j = 0; j < nproto; j++) {
                        if (efi_guid_to_name(protocols[j], &name) == true) {
                                printf("  %s", name);
                                free(name);
                        } else {
                                printf("Error while translating UUID to name");
                        }
                        if ((ret = pager_output("\n")) != 0)
                                break;
                }
                BS->FreePool(protocols);
                if (ret != 0)
                        break;
        }
        pager_close();
        free(buffer);
        return (CMD_OK);
}

#ifdef LOADER_FDT_SUPPORT
extern int command_fdt_internal(int argc, char *argv[]);

/*
 * Since proper fdt command handling function is defined in fdt_loader_cmd.c,
 * and declaring it as extern is in contradiction with COMMAND_SET() macro
 * (which uses static pointer), we're defining wrapper function, which
 * calls the proper fdt handling routine.
 */
static int
command_fdt(int argc, char *argv[])
{
        return (command_fdt_internal(argc, argv));
}

COMMAND_SET(fdt, "fdt", "flattened device tree handling", command_fdt);
#endif

/*
 * Chain load another efi loader.
 */
static int
command_chain(int argc, char *argv[])
{
        EFI_HANDLE loaderhandle;
        EFI_LOADED_IMAGE_PROTOCOL *loaded_image;
        EFI_STATUS status;
        struct stat st;
        struct devdesc *dev;
        char *name, *path;
        void *buf;
        int fd;

        if (argc < 2) {
                command_errmsg = "wrong number of arguments";
                return (CMD_ERROR);
        }

        name = argv[1];

        if ((fd = open(name, O_RDONLY)) < 0) {
                command_errmsg = "no such file";
                return (CMD_ERROR);
        }

        if (fstat(fd, &st) < -1) {
                command_errmsg = "stat failed";
                close(fd);
                return (CMD_ERROR);
        }

        status = BS->AllocatePool(EfiLoaderCode, (UINTN)st.st_size, &buf);
        if (status != EFI_SUCCESS) {
                command_errmsg = "failed to allocate buffer";
                close(fd);
                return (CMD_ERROR);
        }
        if (read(fd, buf, st.st_size) != st.st_size) {
                command_errmsg = "error while reading the file";
                (void) BS->FreePool(buf);
                close(fd);
                return (CMD_ERROR);
        }
        close(fd);
        status = BS->LoadImage(FALSE, IH, NULL, buf, st.st_size, &loaderhandle);
        (void) BS->FreePool(buf);
        if (status != EFI_SUCCESS) {
                printf("LoadImage failed: status code: %lu\n",
                    DECODE_ERROR(status));
                return (CMD_ERROR);
        }
        status = OpenProtocolByHandle(loaderhandle,
            &gEfiLoadedImageProtocolGuid, (void **)&loaded_image);

        if (argc > 2) {
                int i, len = 0;
                CHAR16 *argp;

                for (i = 2; i < argc; i++)
                        len += strlen(argv[i]) + 1;

                len *= sizeof (*argp);
                loaded_image->LoadOptions = argp = malloc(len);
                if (loaded_image->LoadOptions == NULL) {
                        command_errmsg = "Adding LoadOptions: out of memory";
                        (void) BS->UnloadImage(loaded_image);
                        return (CMD_ERROR);
                }
                loaded_image->LoadOptionsSize = len;
                for (i = 2; i < argc; i++) {
                        char *ptr = argv[i];
                        while (*ptr)
                                *(argp++) = *(ptr++);
                        *(argp++) = ' ';
                }
                *(--argv) = 0;
        }

        if (efi_getdev((void **)&dev, name, (const char **)&path) == 0) {
                struct zfs_devdesc *z_dev;
                struct disk_devdesc *d_dev;
                pdinfo_t *hd, *pd;

                switch (dev->d_dev->dv_type) {
                case DEVT_ZFS:
                        z_dev = (struct zfs_devdesc *)dev;
                        loaded_image->DeviceHandle =
                            efizfs_get_handle_by_guid(z_dev->pool_guid);
                        break;
                case DEVT_NET:
                        loaded_image->DeviceHandle =
                            efi_find_handle(dev->d_dev, dev->d_unit);
                        break;
                default:
                        hd = efiblk_get_pdinfo(dev);
                        if (STAILQ_EMPTY(&hd->pd_part)) {
                                loaded_image->DeviceHandle = hd->pd_handle;
                                break;
                        }
                        d_dev = (struct disk_devdesc *)dev;
                        STAILQ_FOREACH(pd, &hd->pd_part, pd_link) {
                                /*
                                 * d_partition should be 255
                                 */
                                if (pd->pd_unit == d_dev->d_slice) {
                                        loaded_image->DeviceHandle =
                                            pd->pd_handle;
                                        break;
                                }
                        }
                        break;
                }
        }

        dev_cleanup();
        status = BS->StartImage(loaderhandle, NULL, NULL);
        if (status != EFI_SUCCESS) {
                printf("StartImage failed: status code: %lu\n",
                    DECODE_ERROR(status));
                free(loaded_image->LoadOptions);
                loaded_image->LoadOptions = NULL;
                status = BS->UnloadImage(loaded_image);
                return (CMD_ERROR);
        }

        return (CMD_ERROR);
}

COMMAND_SET(chain, "chain", "chain load file", command_chain);