root/sys/arch/i386/stand/efiboot/boot.c
/*      $NetBSD: boot.c,v 1.34 2025/10/09 16:10:03 manu Exp $   */

/*-
 * Copyright (c) 2016 Kimihiro Nonaka <nonaka@netbsd.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 REGENTS 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 REGENTS 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 "efiboot.h"

#include <sys/bootblock.h>
#include <sys/boot_flag.h>
#include <machine/limits.h>

#include "bootcfg.h"
#include "bootmod.h"
#include "bootmenu.h"
#include "biosdisk.h"
#include "devopen.h"

#ifdef _STANDALONE
#include <bootinfo.h>
#endif

int errno;
int boot_biosdev;
daddr_t boot_biossector;

extern const char bootprog_name[], bootprog_rev[], bootprog_kernrev[];

extern struct x86_boot_params boot_params;
extern char twiddle_toggle;

static const char * const names[][2] = {
        { "netbsd", "netbsd.gz" },
        { "onetbsd", "onetbsd.gz" },
        { "netbsd.old", "netbsd.old.gz" },
        { "netbsd/kernel", "netbsd/kernel.gz" },
        { "onetbsd/kernel", "onetbsd/kernel.gz" },
        { "netbsd.old/kernel", "netbsd.old/kernel.gz" },
};

#define NUMNAMES        __arraycount(names)
#define DEFFILENAME     names[0][0]

#ifndef EFIBOOTCFG_FILENAME
#define EFIBOOTCFG_FILENAME     "esp:/EFI/NetBSD/boot.cfg"
#endif

void    command_help(char *);
void    command_quit(char *);
void    command_boot(char *);
void    command_pkboot(char *);
void    command_consdev_subr(char *, bool);
void    command_consdev(char *);
void    command_kconsdev(char *);
void    command_root(char *);
void    command_dev(char *);
void    command_devpath(char *);
void    command_efivar(char *);
void    command_gop(char *);
#if LIBSA_ENABLE_LS_OP
void    command_ls(char *);
#endif
void    command_memmap(char *);
#ifndef SMALL
void    command_menu(char *);
#endif
void    command_modules(char *);
void    command_multiboot(char *);
void    command_reloc(char *);
void    command_text(char *);
void    command_version(char *);

const struct bootblk_command commands[] = {
        { "help",       command_help },
        { "?",          command_help },
        { "quit",       command_quit },
        { "boot",       command_boot },
        { "pkboot",     command_pkboot },
        { "consdev",    command_consdev },
        { "kconsdev",   command_kconsdev },
        { "root",       command_root },
        { "dev",        command_dev },
        { "devpath",    command_devpath },
        { "efivar",     command_efivar },
        { "fs",         fs_add },
        { "gop",        command_gop },
        { "load",       module_add },
#if LIBSA_ENABLE_LS_OP
        { "ls",         command_ls },
#endif
        { "memmap",     command_memmap },
#ifndef SMALL
        { "menu",       command_menu },
#endif
        { "modules",    command_modules },
        { "multiboot",  command_multiboot },
        { "reloc",      command_reloc },
        { "rndseed",    rnd_add },
        { "splash",     splash_add },
        { "text",       command_text },
        { "userconf",   userconf_add },
        { "version",    command_version },
        { NULL,         NULL },
};

static char *default_fsname;
static char *default_devname;
static int default_unit, default_partition;
static const char *default_filename;
static const char *default_part_name;

static char *sprint_bootsel(const char *);
static void bootit(const char *, int);
static void bootit2(char *, size_t, int);

int
parsebootfile(const char *fname, char **fsname, char **devname, int *unit,
    int *partition, const char **file)
{
        const char *col;
        static char savedevname[MAXDEVNAME+1];
#if defined(SUPPORT_NFS) || defined(SUPPORT_TFTP)
        const struct netboot_fstab *nf;
#endif

        *fsname = default_fsname;
        if (default_part_name == NULL) {
                *devname = default_devname;
        } else {
                snprintf(savedevname, sizeof(savedevname),
                    "NAME=%s", default_part_name);
                *devname = savedevname;
        }
        *unit = default_unit;
        *partition = default_partition;
        *file = default_filename;

        if (fname == NULL)
                return 0;

        if ((col = strchr(fname, ':')) != NULL) {       /* device given */
                int devlen;
                int u = 0, p = 0;
                int i = 0;

                devlen = col - fname;
                if (devlen > MAXDEVNAME)
                        return EINVAL;

                if (strstr(fname, "NAME=") == fname) {
                        strlcpy(savedevname, fname, devlen + 1);
                        *fsname = "ufs";
                        *devname = savedevname;
                        *unit = -1;
                        *partition = -1;
                        fname = col + 1;
                        goto out;
                }

#define isvalidname(c) ((c) >= 'a' && (c) <= 'z')
                if (!isvalidname(fname[i]))
                        return EINVAL;
                do {
                        savedevname[i] = fname[i];
                        i++;
                } while (isvalidname(fname[i]));
                savedevname[i] = '\0';

#define isnum(c) ((c) >= '0' && (c) <= '9')
                if (i < devlen) {
                        if (!isnum(fname[i]))
                                return EUNIT;
                        do {
                                u *= 10;
                                u += fname[i++] - '0';
                        } while (isnum(fname[i]));
                }

#define isvalidpart(c) ((c) >= 'a' && (c) <= 'z')
                if (i < devlen) {
                        if (!isvalidpart(fname[i]))
                                return EPART;
                        p = fname[i++] - 'a';
                }

                if (i != devlen)
                        return ENXIO;

#if defined(SUPPORT_NFS) || defined(SUPPORT_TFTP)
                nf = netboot_fstab_find(savedevname);
                if (nf != NULL)
                        *fsname = (char *)nf->name;
                else
#endif
                *fsname = "ufs";
                *devname = savedevname;
                *unit = u;
                *partition = p;
                fname = col + 1;
        }

out:
        if (*fname)
                *file = fname;

        return 0;
}

static char *
snprint_bootdev(char *buf, size_t bufsize, const char *devname, int unit,
    int partition)
{
        static const char *no_partition_devs[] = { "esp", "net", "nfs", "tftp" };
        int i;

        for (i = 0; i < __arraycount(no_partition_devs); i++)
                if (strcmp(devname, no_partition_devs[i]) == 0)
                        break;
        if (strstr(devname, "NAME=") == devname)
                strlcpy(buf, devname, bufsize);
        else
                snprintf(buf, bufsize, "%s%d%c", devname, unit,
                  i < __arraycount(no_partition_devs) ? '\0' : 'a' + partition);
        return buf;
}

static char *
sprint_bootsel(const char *filename)
{
        char *fsname, *devname;
        int unit, partition;
        const char *file;
        static char buf[80];

        if (parsebootfile(filename, &fsname, &devname, &unit,
                          &partition, &file) == 0) {
                snprintf(buf, sizeof(buf), "%s:%s", snprint_bootdev(buf,
                    sizeof(buf), devname, unit, partition), file);
                return buf;
        }
        return "(invalid)";
}

void
clearit(void)
{

        if (bootcfg_info.clear)
                clear_pc_screen();
}

static void
bootit(const char *filename, int howto)
{

        if (howto & AB_VERBOSE)
                printf("booting %s (howto 0x%x)\n", sprint_bootsel(filename),
                    howto);

        if (exec_netbsd(filename, efi_loadaddr, howto, 0, efi_cleanup) < 0)
                printf("boot: %s: %s\n", sprint_bootsel(filename),
                       strerror(errno));
        else
                printf("boot returned\n");
}

void
boot(void)
{
        int currname;
        int c;
#if defined(SUPPORT_NFS) || defined(SUPPORT_TFTP)
        const struct netboot_fstab *nf;
#endif

        boot_modules_enabled = !(boot_params.bp_flags & X86_BP_FLAGS_NOMODULES);

        /* try to set default device to what BIOS tells us */
        bios2dev(boot_biosdev, boot_biossector, &default_devname, &default_unit,
            &default_partition, &default_part_name);

        /* if the user types "boot" without filename */
        default_filename = DEFFILENAME;

#if defined(SUPPORT_NFS) || defined(SUPPORT_TFTP)
        nf = netboot_fstab_find(default_devname);
        if (nf != NULL)
                default_fsname = (char *)nf->name;
        else
#endif
        default_fsname = "ufs";

        if (!(boot_params.bp_flags & X86_BP_FLAGS_NOBOOTCONF)) {
#ifdef EFIBOOTCFG_FILENAME
                int rv = EINVAL;
                if (efi_bootdp_type != BOOT_DEVICE_TYPE_NET)
                        rv = parsebootconf(EFIBOOTCFG_FILENAME);
                if (rv)
#endif
                parsebootconf(BOOTCFG_FILENAME);
        } else {
                bootcfg_info.timeout = boot_params.bp_timeout;
        }

        /*
         * If console set in boot.cfg, switch to it.
         * This will print the banner, so we don't need to explicitly do it
         */
        if (bootcfg_info.consdev) {
                command_consdev(bootcfg_info.consdev);
        } else {
                clearit();
                print_bootcfg_banner(bootprog_name, bootprog_rev);
        }

        /* Display the menu, if applicable */
        twiddle_toggle = 0;
        if (bootcfg_info.nummenu > 0) {
                /* Does not return */
                doboottypemenu();
        }

        printf("Press return to boot now, any other key for boot menu\n");
        for (currname = 0; currname < NUMNAMES; currname++) {
                printf("booting %s - starting in ",
                       sprint_bootsel(names[currname][0]));

                c = awaitkey((bootcfg_info.timeout < 0) ? 0
                    : bootcfg_info.timeout, 1);
                if ((c != '\r') && (c != '\n') && (c != '\0')) {
                    if ((boot_params.bp_flags & X86_BP_FLAGS_PASSWORD) == 0) {
                        /* do NOT ask for password */
                        bootmenu(); /* does not return */
                    } else {
                        /* DO ask for password */
                        if (check_password((char *)boot_params.bp_password)) {
                            /* password ok */
                            printf("type \"?\" or \"help\" for help.\n");
                            bootmenu(); /* does not return */
                        } else {
                            /* bad password */
                            printf("Wrong password.\n");
                            currname = 0;
                            continue;
                        }
                    }
                }

                /*
                 * try pairs of names[] entries, foo and foo.gz
                 */
                /* don't print "booting..." again */
                bootit(names[currname][0], 0);
                /* since it failed, try compressed bootfile. */
                bootit(names[currname][1], AB_VERBOSE);
        }

        bootmenu();     /* does not return */
}

/* ARGSUSED */
void
command_help(char *arg)
{

        printf("commands are:\n"
               "boot [dev:][filename] [-12acdqsvxz]\n"
#ifndef NO_RAIDFRAME
               "     dev syntax is (hd|fd|cd|raid)[N[x]]\n"
#else
               "     dev syntax is (hd|fd|cd)[N[x]]\n"
#endif
#ifndef NO_GPT
               "                or NAME=gpt_label\n"
#endif
               "     (ex. \"hd0a:netbsd.old -s\")\n"
               "pkboot [dev:][filename] [-12acdqsvxz]\n"
               "dev [dev:]\n"
               "consdev {cons_spec}\n"
               "kconsdev {cons_spec}\n"
               "      cons_spec can be\n"
               "      pc for keyboard and monitor\n"
               "      com[0123][,{speed}\n"
               "      com[,{addr}[,{speed}]] for EISA serial port\n"
               "      com{unit}[,{speed}]] for other serial port\n"
               "      ucom{unit}[,{speed}] for USB-to-serial adapter\n"
               "root    {root_spec}\n"
               "     root_spec can be disk, e.g. wd0, sd0\n"
               "     or string like wedge:name\n"
               "devpath\n"
               "efivar\n"
               "gop [{modenum|list}]\n"
               "load {path_to_module}\n"
#if LIBSA_ENABLE_LS_OP
               "ls [dev:][path]\n"
#endif
               "memmap [{sorted|unsorted|compact}]\n"
#ifndef SMALL
               "menu (reenters boot menu, if defined in boot.cfg)\n"
#endif
               "modules {on|off|enabled|disabled}\n"
               "multiboot [dev:][filename] [<args>]\n"
               "reloc {address|none|default}\n"
               "rndseed {path_to_rndseed_file}\n"
               "splash {path_to_image_file}\n"
               "text [{modenum|list}]\n"
               "userconf {command}\n"
               "version\n"
               "help|?\n"
               "quit\n");
}

#if LIBSA_ENABLE_LS_OP
void
command_ls(char *arg)
{
        const char *save = default_filename;

        default_filename = "/";
        ls(arg);
        default_filename = save;
}
#endif

/* ARGSUSED */
void
command_quit(char *arg)
{

        printf("Exiting...\n");
        delay(1 * 1000 * 1000);
        reboot();
        /* Note: we shouldn't get to this point! */
        panic("Could not reboot!");
}

static void
bootit2(char *path, size_t plen, int howto)
{
        bootit(path, howto);
        snprintf(path, plen, "%s.gz", path);
        bootit(path, howto | AB_VERBOSE);
}

void
command_boot(char *arg)
{
        char *filename;
        char path[512];
        int howto;

        if (!parseboot(arg, &filename, &howto))
                return;

        if (filename != NULL && filename[0] != '\0') {
                /* try old locations first to appease atf test beds */
                snprintf(path, sizeof(path) - 4, "%s", filename);
                bootit2(path, sizeof(path), howto);

                /*
                 * now treat given filename as a directory unless there
                 * is already an embedded path-name separator '/' present
                 */
                if (strchr(filename + 1, '/') == NULL) {
                        snprintf(path, sizeof(path) - 4, "%s/kernel",
                            filename);
                        bootit2(path, sizeof(path), howto);
                }
        } else {
                int i;

                for (i = 0; i < NUMNAMES; i++) {
                        bootit(names[i][0], howto);
                        bootit(names[i][1], howto);
                }
        }
}

void
command_pkboot(char *arg)
{
        extern int has_prekern;
        has_prekern = 1;
        command_boot(arg);
        has_prekern = 0;
}

void
command_dev(char *arg)
{
        static char savedevname[MAXDEVNAME + 1];
        char buf[80];
        char *devname;
        const char *file; /* dummy */

        if (*arg == '\0') {
                efi_disk_show();
                efi_net_show();

                if (default_part_name != NULL)
                        printf("default NAME=%s\n", default_part_name);
                else
                        printf("default %s\n",
                               snprint_bootdev(buf, sizeof(buf),
                                               default_devname, default_unit,
                                               default_partition));
                return;
        }

        if (strchr(arg, ':') == NULL ||
            parsebootfile(arg, &default_fsname, &devname, &default_unit,
              &default_partition, &file)) {
                command_help(NULL);
                return;
        }

        /* put to own static storage */
        strncpy(savedevname, devname, MAXDEVNAME + 1);
        default_devname = savedevname;

        /* +5 to skip leading NAME= */
        if (strstr(devname, "NAME=") == devname)
                default_part_name = default_devname + 5;
}

static const struct cons_devs {
        const char      *name;
        u_int           tag;
        int             ioport;
        bool            parse_unit;
} cons_devs[] = {
        { "pc",         CONSDEV_PC,   0, false },
        { "com0",       CONSDEV_COM0, 0, false },
        { "com1",       CONSDEV_COM1, 0, false },
        { "com2",       CONSDEV_COM2, 0, false },
        { "com3",       CONSDEV_COM3, 0, false },
        { "com0kbd",    CONSDEV_COM0KBD, 0, false },
        { "com1kbd",    CONSDEV_COM1KBD, 0, false },
        { "com2kbd",    CONSDEV_COM2KBD, 0, false },
        { "com3kbd",    CONSDEV_COM3KBD, 0, false },
        { "ucom",       CONSDEV_UCOM, 0, true },
        { "com",        CONSDEV_COM0, -1, false }, /* backward compatible */
        { "com",        CONSDEV_COM,  0, true },  /* can match e.g.: com8 */
        { "auto",       CONSDEV_AUTO, 0, false },
        { NULL,         0, 0, false }
};

void
command_consdev(char *arg)
{
        return command_consdev_subr(arg, true);
}

void
command_kconsdev(char *arg)
{
        return command_consdev_subr(arg, false);
}

void
command_consdev_subr(char *arg, bool switchcons)
{
        const struct cons_devs *cdp;
        char *sep, *sep2 = NULL;
        int ioport, speed = 0;
        int unit;
        size_t xname_len;
        size_t devname_len;
        char *cp;

        if (*arg == '\0') {
                efi_cons_show();
                return;
        }

        sep = strchr(arg, ',');
        if (sep != NULL) {
                *sep++ = '\0';
                sep2 = strchr(sep, ',');
                if (sep2 != NULL)
                        *sep2++ = '\0';
        }


        /*
         * arg is for instance com5 or com5,0x3f8,115200
         * we compute devname_len = strlen("com")
         *            unit = 5
         */
        xname_len = strlen(arg);
        devname_len = xname_len;
        unit = -1;
        cp = strchr(arg, (int)',');
        if (cp == NULL)
                cp = arg + xname_len;
        while (--cp >= arg) {
                if (!isdigit((int)*cp)) {
                        if (cp - arg > 1) {
                                devname_len = cp + 1 - arg;
                                unit = (int)strtoul(cp + 1, NULL, 10);
                                break;
                        }
                }
        }

        for (cdp = cons_devs; cdp->name; cdp++) {
                bool match;

                if (cdp->parse_unit)
                        match = (strncmp(arg, cdp->name, devname_len) == 0);
                else
                        match = (strcmp(arg, cdp->name) == 0);
                if (match) {
                        ioport = cdp->ioport;
                        if (cdp->tag == CONSDEV_PC || cdp->tag == CONSDEV_AUTO) {
                                if (sep != NULL || sep2 != NULL)
                                        goto error;
                        } else {
                                /* com? */
                                if (ioport == -1) {
                                        if (sep != NULL) {
                                                u_long t = strtoul(sep, NULL, 0);
                                                if (t > INT_MAX)
                                                        goto error;
                                                ioport = (int)t;
                                        }
                                        if (sep2 != NULL) {
                                                speed = atoi(sep2);
                                                if (speed < 0)
                                                        goto error;
                                        }
                                } else {
                                        if (sep != NULL) {
                                                speed = atoi(sep);
                                                if (speed < 0)
                                                        goto error;
                                        }
                                        if (sep2 != NULL)
                                                goto error;
                                }
                        }
                        efi_consinit(cdp->tag, ioport, unit, speed, switchcons);
                        if (switchcons) {
                                clearit();
                                print_bootcfg_banner(bootprog_name,
                                    bootprog_rev);
                        }
                        return;
                }
        }
error:
        printf("invalid console device.\n");
}

void
command_root(char *arg)
{
        struct btinfo_rootdevice *biv = &bi_root;

        strncpy(biv->devname, arg, sizeof(biv->devname));
        if (biv->devname[sizeof(biv->devname)-1] != '\0') {
                biv->devname[sizeof(biv->devname)-1] = '\0';
                printf("truncated to %s\n",biv->devname);
        }
}


#ifndef SMALL
/* ARGSUSED */
void
command_menu(char *arg)
{

        if (bootcfg_info.nummenu > 0) {
                /* Does not return */
                doboottypemenu();
        } else
                printf("No menu defined in boot.cfg\n");
}
#endif /* !SMALL */

void
command_modules(char *arg)
{

        if (strcmp(arg, "enabled") == 0 ||
            strcmp(arg, "on") == 0)
                boot_modules_enabled = true;
        else if (strcmp(arg, "disabled") == 0 ||
            strcmp(arg, "off") == 0)
                boot_modules_enabled = false;
        else
                printf("invalid flag, must be 'enabled' or 'disabled'.\n");
}

void
command_multiboot(char *arg)
{
        char *filename;

        filename = arg;
        if (exec_multiboot(filename, gettrailer(arg)) < 0)
                printf("multiboot: %s: %s\n", sprint_bootsel(filename),
                       strerror(errno));
        else
                printf("boot returned\n");
}

void
command_reloc(char *arg)
{
        char *ep;

        if (*arg == '\0') {
                switch (efi_reloc_type) {
                case RELOC_NONE:
                        printf("reloc: none\n");
                        break;
                case RELOC_ADDR:
                        printf("reloc: %p\n", (void *)efi_kernel_reloc);
                        break;
                case RELOC_DEFAULT:
                default:
                        printf("reloc: default\n");
                        break;
                }
                goto out;
        }

        if (strcmp(arg, "default") == 0) {
                efi_reloc_type = RELOC_DEFAULT;
                goto out;
        }

        if (strcmp(arg, "none") == 0) {
                efi_reloc_type = RELOC_NONE;
                goto out;
        }

        errno = 0;
        efi_kernel_reloc = strtoul(arg, &ep, 0);
        if (ep == arg || *ep != '\0' || errno)
                printf("could not parse address \"%s\"\n", arg);
        else
                efi_reloc_type = RELOC_ADDR;
out:
        return;

}

void
command_version(char *arg)
{
        CHAR16 *path;
        char *upath, *ufirmware;
        int rv;

        if (strcmp(arg, "full") == 0) {
                printf("ImageBase: 0x%" PRIxPTR "\n",
                    (uintptr_t)efi_li->ImageBase);
                printf("Stack: 0x%" PRIxPTR "\n", efi_main_sp);
                printf("EFI version: %d.%02d\n",
                    ST->Hdr.Revision >> 16, ST->Hdr.Revision & 0xffff);
                ufirmware = NULL;
                rv = ucs2_to_utf8(ST->FirmwareVendor, &ufirmware);
                if (rv == 0) {
                        printf("EFI Firmware: %s (rev %d.%02d)\n", ufirmware,
                            ST->FirmwareRevision >> 16,
                            ST->FirmwareRevision & 0xffff);
                        FreePool(ufirmware);
                }
                path = DevicePathToStr(efi_bootdp);
                upath = NULL;
                rv = ucs2_to_utf8(path, &upath);
                FreePool(path);
                if (rv == 0) {
                        printf("Boot DevicePath: %d:%d:%s\n",
                            DevicePathType(efi_bootdp),
                            DevicePathSubType(efi_bootdp), upath);
                        FreePool(upath);
                }
        }

        printf("\n"
            ">> %s, Revision %s (from NetBSD %s)\n"
            ">> Memory: %d/%d k\n",
            bootprog_name, bootprog_rev, bootprog_kernrev,
            getbasemem(), getextmem());
}

void
command_memmap(char *arg)
{
        bool sorted = true;
        bool compact = false;

        if (*arg == '\0' || strcmp(arg, "sorted") == 0)
                /* Already sorted is true. */;
        else if (strcmp(arg, "unsorted") == 0)
                sorted = false;
        else if (strcmp(arg, "compact") == 0)
                compact = true;
        else {
                printf("invalid flag, "
                    "must be 'sorted', 'unsorted' or 'compact'.\n");
                return;
        }

        efi_memory_show_map(sorted, compact);
}

void
command_devpath(char *arg)
{
        EFI_STATUS status;
        UINTN i, nhandles;
        EFI_HANDLE *handles;
        EFI_DEVICE_PATH *dp0, *dp;
        CHAR16 *path;
        char *upath;
        UINTN cols, rows, row = 0;
        int rv;

        status = uefi_call_wrapper(ST->ConOut->QueryMode, 4, ST->ConOut,
            ST->ConOut->Mode->Mode, &cols, &rows);
        if (EFI_ERROR(status) || rows <= 2)
                rows = 0;
        else
                rows -= 2;

        /*
         * all devices.
         */
        status = LibLocateHandle(ByProtocol, &DevicePathProtocol, NULL,
            &nhandles, &handles);
        if (EFI_ERROR(status))
                return;

        for (i = 0; i < nhandles; i++) {
                status = uefi_call_wrapper(BS->HandleProtocol, 3, handles[i],
                    &DevicePathProtocol, (void **)&dp0);
                if (EFI_ERROR(status))
                        break;

                printf("DevicePathType %d\n", DevicePathType(dp0));
                if (++row >= rows) {
                        row = 0;
                        printf("Press Any Key to continue :");
                        (void) awaitkey(-1, 0);
                        printf("\n");
                }
                for (dp = dp0;
                     !IsDevicePathEnd(dp);
                     dp = NextDevicePathNode(dp)) {

                        path = DevicePathToStr(dp);
                        upath = NULL;
                        rv = ucs2_to_utf8(path, &upath);
                        FreePool(path);
                        if (rv) {
                                printf("convert failed\n");
                                break;
                        }

                        printf("%d:%d:%s\n", DevicePathType(dp),
                            DevicePathSubType(dp), upath);
                        FreePool(upath);

                        if (++row >= rows) {
                                row = 0;
                                printf("Press Any Key to continue :");
                                (void) awaitkey(-1, 0);
                                printf("\n");
                        }
                }
        }
}


void
command_efivar(char *arg)
{
        static const char header[] =
         "GUID                                 Variable Name        Value\n"
         "==================================== ==================== ========\n";
        EFI_STATUS status;
        UINTN sz = 64, osz;
        CHAR16 *name = NULL, *tmp, *val, guid[128];
        char *uname, *uval, *uguid;
        EFI_GUID vendor;
        UINTN cols, rows, row = 0;
        int rv;

        status = uefi_call_wrapper(ST->ConOut->QueryMode, 4, ST->ConOut,
            ST->ConOut->Mode->Mode, &cols, &rows);
        if (EFI_ERROR(status) || rows <= 2)
                rows = 0;
        else
                rows -= 2;

        name = AllocatePool(sz);
        if (name == NULL) {
                printf("memory allocation failed: %" PRIuMAX" bytes\n",
                    (uintmax_t)sz);
                return;
        }

        SetMem(name, sz, 0);
        vendor = NullGuid;

        printf("%s", header);
        for (;;) {
                osz = sz;
                status = uefi_call_wrapper(RT->GetNextVariableName, 3,
                    &sz, name, &vendor);
                if (EFI_ERROR(status)) {
                        if (status == EFI_NOT_FOUND)
                                break;
                        if (status != EFI_BUFFER_TOO_SMALL) {
                                printf("GetNextVariableName failed: %" PRIxMAX "\n",
                                    (uintmax_t)status);
                                break;
                        }

                        tmp = AllocatePool(sz);
                        if (tmp == NULL) {
                                printf("memory allocation failed: %" PRIuMAX
                                    "bytes\n", (uintmax_t)sz);
                                break;
                        }
                        SetMem(tmp, sz, 0);
                        CopyMem(tmp, name, osz);
                        FreePool(name);
                        name = tmp;
                        continue;
                }

                val = LibGetVariable(name, &vendor);
                if (val != NULL) {
                        uval = NULL;
                        rv = ucs2_to_utf8(val, &uval);
                        FreePool(val);
                        if (rv) {
                                printf("value convert failed\n");
                                break;
                        }
                } else
                        uval = NULL;
                uname = NULL;
                rv = ucs2_to_utf8(name, &uname);
                if (rv) {
                        printf("name convert failed\n");
                        FreePool(uval);
                        break;
                }
                GuidToString(guid, &vendor);
                uguid = NULL;
                rv = ucs2_to_utf8(guid, &uguid);
                if (rv) {
                        printf("GUID convert failed\n");
                        FreePool(uval);
                        FreePool(uname);
                        break;
                }
                printf("%-35s %-20s %s\n", uguid, uname, uval ? uval : "(null)");
                FreePool(uguid);
                FreePool(uname);
                if (uval != NULL)
                        FreePool(uval);

                if (++row >= rows) {
                        row = 0;
                        printf("Press Any Key to continue :");
                        (void) awaitkey(-1, 0);
                        printf("\n");
                }
        }

        FreePool(name);
}