efi_console.c

/*
 * Copyright (c) 2000 Doug Rabson
 * 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 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 AUTHOR 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>

#include <efi.h>
#include <efilib.h>
#include <sys/tem_impl.h>
#include <sys/multiboot2.h>
#include <machine/metadata.h>
#include <gfx_fb.h>

#include "bootstrap.h"

struct efi_fb		efifb;
EFI_GRAPHICS_OUTPUT	*gop;
EFI_UGA_DRAW_PROTOCOL	*uga;

static EFI_GUID ccontrol_protocol_guid = EFI_CONSOLE_CONTROL_PROTOCOL_GUID;
static EFI_CONSOLE_CONTROL_PROTOCOL	*console_control;
static EFI_GUID simple_input_ex_guid = EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL_GUID;
static EFI_CONSOLE_CONTROL_SCREEN_MODE	console_mode;
static SIMPLE_TEXT_OUTPUT_INTERFACE	*conout;

/* mode change callback and argument from tem */
static vis_modechg_cb_t modechg_cb;
static struct vis_modechg_arg *modechg_arg;
static tem_vt_state_t tem;

struct efi_console_data {
	struct visual_ops			*ecd_visual_ops;
	SIMPLE_INPUT_INTERFACE			*ecd_conin;
	EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL	*ecd_coninex;
};

#define	KEYBUFSZ 10
static unsigned keybuf[KEYBUFSZ];	/* keybuf for extended codes */

static int key_pending;

static const unsigned char solaris_color_to_efi_color[16] = {
	EFI_WHITE,
	EFI_BLACK,
	EFI_BLUE,
	EFI_GREEN,
	EFI_CYAN,
	EFI_RED,
	EFI_MAGENTA,
	EFI_BROWN,
	EFI_LIGHTGRAY,
	EFI_DARKGRAY,
	EFI_LIGHTBLUE,
	EFI_LIGHTGREEN,
	EFI_LIGHTCYAN,
	EFI_LIGHTRED,
	EFI_LIGHTMAGENTA,
	EFI_YELLOW
};

#define	DEFAULT_FGCOLOR	EFI_LIGHTGRAY
#define	DEFAULT_BGCOLOR	EFI_BLACK

extern int efi_find_framebuffer(struct efi_fb *efifb);

static void efi_framebuffer_setup(void);
static void efi_cons_probe(struct console *);
static int efi_cons_init(struct console *, int);
static void efi_cons_putchar(struct console *, int);
static void efi_cons_efiputchar(int);
static int efi_cons_getchar(struct console *);
static int efi_cons_poll(struct console *);
static int efi_cons_ioctl(struct console *cp, int cmd, void *data);
static void efi_cons_devinfo(struct console *);

static int efi_fb_devinit(struct vis_devinit *);
static void efi_cons_cursor(struct vis_conscursor *);

static int efi_text_devinit(struct vis_devinit *);
static int efi_text_cons_clear(struct vis_consclear *);
static void efi_text_cons_copy(struct vis_conscopy *);
static void efi_text_cons_display(struct vis_consdisplay *);

struct console efi_console = {
	.c_name = "text",
	.c_desc = "EFI console",
	.c_flags = C_WIDEOUT,
	.c_probe = efi_cons_probe,
	.c_init = efi_cons_init,
	.c_out = efi_cons_putchar,
	.c_in = efi_cons_getchar,
	.c_ready = efi_cons_poll,
	.c_ioctl = efi_cons_ioctl,
	.c_devinfo = efi_cons_devinfo,
	.c_private = NULL
};

static struct vis_identifier fb_ident = { "efi_fb" };
static struct vis_identifier text_ident = { "efi_text" };

struct visual_ops fb_ops = {
	.ident = &fb_ident,
	.kdsetmode = NULL,
	.devinit = efi_fb_devinit,
	.cons_copy = NULL,
	.cons_display = NULL,
	.cons_cursor = efi_cons_cursor,
	.cons_clear = NULL,
	.cons_put_cmap = NULL
};

struct visual_ops text_ops = {
	.ident = &text_ident,
	.kdsetmode = NULL,
	.devinit = efi_text_devinit,
	.cons_copy = efi_text_cons_copy,
	.cons_display = efi_text_cons_display,
	.cons_cursor = efi_cons_cursor,
	.cons_clear = efi_text_cons_clear,
	.cons_put_cmap = NULL
};

/*
 * platform specific functions for tem
 */
int
plat_stdout_is_framebuffer(void)
{
	return (console_mode == EfiConsoleControlScreenGraphics);
}

void
plat_tem_hide_prom_cursor(void)
{
	conout->EnableCursor(conout, FALSE);
}

static void
plat_tem_display_prom_cursor(screen_pos_t row, screen_pos_t col)
{

	conout->SetCursorPosition(conout, col, row);
	conout->EnableCursor(conout, TRUE);
}

void
plat_tem_get_prom_pos(uint32_t *row, uint32_t *col)
{
	if (console_mode == EfiConsoleControlScreenText) {
		*col = (uint32_t)conout->Mode->CursorColumn;
		*row = (uint32_t)conout->Mode->CursorRow;
	} else {
		*col = 0;
		*row = 0;
	}
}

/*
 * plat_tem_get_prom_size() is supposed to return screen size
 * in chars. Return real data for text mode and TEM defaults for graphical
 * mode, so the tem can compute values based on default and font.
 */
void
plat_tem_get_prom_size(size_t *height, size_t *width)
{
	UINTN cols, rows;
	if (console_mode == EfiConsoleControlScreenText) {
		(void) conout->QueryMode(conout, conout->Mode->Mode,
		    &cols, &rows);
		*height = (size_t)rows;
		*width = (size_t)cols;
	} else {
		*height = TEM_DEFAULT_ROWS;
		*width = TEM_DEFAULT_COLS;
	}
}

/*
 * Callback to notify about console mode change.
 * mode is value from enum EFI_CONSOLE_CONTROL_SCREEN_MODE.
 */
void
plat_cons_update_mode(int mode)
{
	UINTN cols, rows;
	struct vis_devinit devinit;
	struct efi_console_data *ecd = efi_console.c_private;

	/* Make sure we have usable console. */
	if (efi_find_framebuffer(&efifb)) {
		console_mode = EfiConsoleControlScreenText;
	} else {
		efi_framebuffer_setup();
		if (mode != -1 && console_mode != mode)
			console_mode = mode;
	}

	if (console_control != NULL)
		(void) console_control->SetMode(console_control, console_mode);

	/* some firmware enables the cursor when switching modes */
	conout->EnableCursor(conout, FALSE);
	if (console_mode == EfiConsoleControlScreenText) {
		(void) conout->QueryMode(conout, conout->Mode->Mode,
		    &cols, &rows);
		devinit.version = VIS_CONS_REV;
		devinit.width = cols;
		devinit.height = rows;
		devinit.depth = 4;
		devinit.linebytes = cols;
		devinit.color_map = NULL;
		devinit.mode = VIS_TEXT;
		ecd->ecd_visual_ops = &text_ops;
	} else {
		devinit.version = VIS_CONS_REV;
		devinit.width = gfx_fb.framebuffer_common.framebuffer_width;
		devinit.height = gfx_fb.framebuffer_common.framebuffer_height;
		devinit.depth = gfx_fb.framebuffer_common.framebuffer_bpp;
		devinit.linebytes = gfx_fb.framebuffer_common.framebuffer_pitch;
		devinit.color_map = gfx_fb_color_map;
		devinit.mode = VIS_PIXEL;
		ecd->ecd_visual_ops = &fb_ops;
	}

	modechg_cb(modechg_arg, &devinit);
}

static int
efi_fb_devinit(struct vis_devinit *data)
{
	if (console_mode != EfiConsoleControlScreenGraphics)
		return (1);

	data->version = VIS_CONS_REV;
	data->width = gfx_fb.framebuffer_common.framebuffer_width;
	data->height = gfx_fb.framebuffer_common.framebuffer_height;
	data->depth = gfx_fb.framebuffer_common.framebuffer_bpp;
	data->linebytes = gfx_fb.framebuffer_common.framebuffer_pitch;
	data->color_map = gfx_fb_color_map;
	data->mode = VIS_PIXEL;

	modechg_cb = data->modechg_cb;
	modechg_arg = data->modechg_arg;

	return (0);
}

static int
efi_text_devinit(struct vis_devinit *data)
{
	UINTN cols, rows;

	if (console_mode != EfiConsoleControlScreenText)
		return (1);

	(void) conout->QueryMode(conout, conout->Mode->Mode, &cols, &rows);
	data->version = VIS_CONS_REV;
	data->width = cols;
	data->height = rows;
	data->depth = 4;
	data->linebytes = cols;
	data->color_map = NULL;
	data->mode = VIS_TEXT;

	modechg_cb = data->modechg_cb;
	modechg_arg = data->modechg_arg;

	return (0);
}

static int
efi_text_cons_clear(struct vis_consclear *ca)
{
	EFI_STATUS st;
	UINTN attr = conout->Mode->Attribute & 0x0F;
	uint8_t bg;

	bg = solaris_color_to_efi_color[ca->bg_color & 0xF] & 0x7;

	attr = EFI_TEXT_ATTR(attr, bg);
	st = conout->SetAttribute(conout, attr);
	if (EFI_ERROR(st))
		return (1);
	st = conout->ClearScreen(conout);
	if (EFI_ERROR(st))
		return (1);
	return (0);
}

static void
efi_text_cons_copy(struct vis_conscopy *ma)
{
	UINTN col, row;

	col = 0;
	row = ma->e_row;
	conout->SetCursorPosition(conout, col, row);

	efi_cons_efiputchar('\n');
}

static void
efi_text_cons_display(struct vis_consdisplay *da)
{
	EFI_STATUS st;
	UINTN attr;
	UINTN row, col;
	tem_char_t *data;
	uint8_t fg, bg;
	int i;

	(void) conout->QueryMode(conout, conout->Mode->Mode, &col, &row);

	/* reduce clear line on bottom row by one to prevent autoscroll */
	if (row - 1 == da->row && da->col == 0 && da->width == col)
		da->width--;

	data = (tem_char_t *)da->data;
	fg = solaris_color_to_efi_color[da->fg_color & 0xf];
	bg = solaris_color_to_efi_color[da->bg_color & 0xf] & 0x7;
	attr = EFI_TEXT_ATTR(fg, bg);

	st = conout->SetAttribute(conout, attr);
	if (EFI_ERROR(st))
		return;
	row = da->row;
	col = da->col;
	conout->SetCursorPosition(conout, col, row);
	for (i = 0; i < da->width; i++)
		efi_cons_efiputchar(data[i]);
}

static void efi_cons_cursor(struct vis_conscursor *cc)
{
	switch (cc->action) {
	case VIS_HIDE_CURSOR:
		if (plat_stdout_is_framebuffer())
			gfx_fb_display_cursor(cc);
		else
			plat_tem_hide_prom_cursor();
		break;
	case VIS_DISPLAY_CURSOR:
		if (plat_stdout_is_framebuffer())
			gfx_fb_display_cursor(cc);
		else
			plat_tem_display_prom_cursor(cc->row, cc->col);
		break;
	case VIS_GET_CURSOR: {	/* only used at startup */
		uint32_t row, col;

		row = col = 0;
		plat_tem_get_prom_pos(&row, &col);
		cc->row = row;
		cc->col = col;
		}
		break;
	}
}

static int
efi_cons_ioctl(struct console *cp, int cmd, void *data)
{
	struct efi_console_data *ecd = cp->c_private;
	struct visual_ops *ops = ecd->ecd_visual_ops;

	switch (cmd) {
	case VIS_GETIDENTIFIER:
		memmove(data, ops->ident, sizeof (struct vis_identifier));
		break;
	case VIS_DEVINIT:
		return (ops->devinit(data));
	case VIS_CONSCLEAR:
		return (ops->cons_clear(data));
	case VIS_CONSCOPY:
		ops->cons_copy(data);
		break;
	case VIS_CONSDISPLAY:
		ops->cons_display(data);
		break;
	case VIS_CONSCURSOR:
		ops->cons_cursor(data);
		break;
	default:
		return (EINVAL);
	}
	return (0);
}

static void
efi_framebuffer_setup(void)
{
	int bpp, pos;

	bpp = fls(efifb.fb_mask_red | efifb.fb_mask_green |
	    efifb.fb_mask_blue | efifb.fb_mask_reserved);

	gfx_fb.framebuffer_common.mb_type = MULTIBOOT_TAG_TYPE_FRAMEBUFFER;
	gfx_fb.framebuffer_common.mb_size = sizeof (gfx_fb);
	gfx_fb.framebuffer_common.framebuffer_addr = efifb.fb_addr;
	gfx_fb.framebuffer_common.framebuffer_width = efifb.fb_width;
	gfx_fb.framebuffer_common.framebuffer_height = efifb.fb_height;
	gfx_fb.framebuffer_common.framebuffer_bpp = bpp;
	gfx_fb.framebuffer_common.framebuffer_pitch =
	    efifb.fb_stride * (bpp >> 3);
	gfx_fb.framebuffer_common.framebuffer_type =
	    MULTIBOOT_FRAMEBUFFER_TYPE_RGB;
	gfx_fb.framebuffer_common.mb_reserved = 0;

	pos = ffs(efifb.fb_mask_red);
	if (pos != 0)
		pos--;
	gfx_fb.u.fb2.framebuffer_red_mask_size = fls(efifb.fb_mask_red >> pos);
	gfx_fb.u.fb2.framebuffer_red_field_position = pos;
	pos = ffs(efifb.fb_mask_green);
	if (pos != 0)
		pos--;
	gfx_fb.u.fb2.framebuffer_green_mask_size =
	    fls(efifb.fb_mask_green >> pos);
	gfx_fb.u.fb2.framebuffer_green_field_position = pos;
	pos = ffs(efifb.fb_mask_blue);
	if (pos != 0)
		pos--;
	gfx_fb.u.fb2.framebuffer_blue_mask_size =
	    fls(efifb.fb_mask_blue >> pos);
	gfx_fb.u.fb2.framebuffer_blue_field_position = pos;
}

static void
efi_cons_probe(struct console *cp)
{
	cp->c_flags |= C_PRESENTIN | C_PRESENTOUT;
}

static int
efi_cons_init(struct console *cp, int arg __unused)
{
	struct efi_console_data *ecd;
	void *coninex;
	EFI_STATUS status;
	UINTN i, max_dim, best_mode, cols, rows;

	if (cp->c_private != NULL)
		return (0);

	ecd = calloc(1, sizeof (*ecd));
	/*
	 * As console probing is called very early, the only reason for
	 * out of memory can be that we just do not have enough memory.
	 */
	if (ecd == NULL)
		panic("efi_cons_probe: This system has not enough memory\n");
	cp->c_private = ecd;

	ecd->ecd_conin = ST->ConIn;
	conout = ST->ConOut;

	conout->SetAttribute(conout, EFI_TEXT_ATTR(DEFAULT_FGCOLOR,
	    DEFAULT_BGCOLOR));
	memset(keybuf, 0, KEYBUFSZ);

	status = BS->LocateProtocol(&ccontrol_protocol_guid, NULL,
	    (void **)&console_control);
	if (status == EFI_SUCCESS) {
		BOOLEAN GopUgaExists, StdInLocked;
		status = console_control->GetMode(console_control,
		    &console_mode, &GopUgaExists, &StdInLocked);
	} else {
		console_mode = EfiConsoleControlScreenText;
	}

	max_dim = best_mode = 0;
	for (i = 0; i <= conout->Mode->MaxMode; i++) {
		status = conout->QueryMode(conout, i, &cols, &rows);
		if (EFI_ERROR(status))
			continue;
		if (cols * rows > max_dim) {
			max_dim = cols * rows;
			best_mode = i;
		}
	}
	if (max_dim > 0)
		conout->SetMode(conout, best_mode);
	status = conout->QueryMode(conout, best_mode, &cols, &rows);
	if (EFI_ERROR(status)) {
		setenv("screen-#rows", "24", 1);
		setenv("screen-#cols", "80", 1);
	} else {
		char env[8];
		snprintf(env, sizeof (env), "%u", (unsigned)rows);
		setenv("screen-#rows", env, 1);
		snprintf(env, sizeof (env), "%u", (unsigned)cols);
		setenv("screen-#cols", env, 1);
	}

	if (efi_find_framebuffer(&efifb)) {
		console_mode = EfiConsoleControlScreenText;
		ecd->ecd_visual_ops = &text_ops;
	} else {
		efi_framebuffer_setup();
		console_mode = EfiConsoleControlScreenGraphics;
		ecd->ecd_visual_ops = &fb_ops;
	}

	if (console_control != NULL)
		(void) console_control->SetMode(console_control, console_mode);

	/* some firmware enables the cursor when switching modes */
	conout->EnableCursor(conout, FALSE);

	coninex = NULL;
	/*
	 * Try to set up for SimpleTextInputEx protocol. If not available,
	 * we will use SimpleTextInput protocol.
	 */
	status = BS->OpenProtocol(ST->ConsoleInHandle, &simple_input_ex_guid,
	    &coninex, IH, NULL, EFI_OPEN_PROTOCOL_GET_PROTOCOL);
	if (status == EFI_SUCCESS)
		ecd->ecd_coninex = coninex;

	gfx_framework_init(&fb_ops);

	if (tem_info_init(cp) == 0 && tem == NULL) {
		tem = tem_init();
		if (tem != NULL)
			tem_activate(tem, B_TRUE);
	}

	if (tem == NULL)
		panic("Failed to set up console terminal");

	return (0);
}

static void
efi_cons_putchar(struct console *cp __unused, int c)
{
	uint8_t buf = c;

	/* make sure we have some console output, support for panic() */
	if (tem == NULL)
		efi_cons_efiputchar(c);
	else
		tem_write(tem, &buf, sizeof (buf));
}

static int
keybuf_getchar(void)
{
	int i, c = 0;

	for (i = 0; i < KEYBUFSZ; i++) {
		if (keybuf[i] != 0) {
			c = keybuf[i];
			keybuf[i] = 0;
			break;
		}
	}

	return (c);
}

static bool
keybuf_ischar(void)
{
	int i;

	for (i = 0; i < KEYBUFSZ; i++) {
		if (keybuf[i] != 0)
			return (true);
	}
	return (false);
}

/*
 * We are not reading input before keybuf is empty, so we are safe
 * just to fill keybuf from the beginning.
 */
static void
keybuf_inschar(EFI_INPUT_KEY *key)
{

	switch (key->ScanCode) {
	case SCAN_UP: /* UP */
		keybuf[0] = 0x1b;	/* esc */
		keybuf[1] = '[';
		keybuf[2] = 'A';
		break;
	case SCAN_DOWN: /* DOWN */
		keybuf[0] = 0x1b;	/* esc */
		keybuf[1] = '[';
		keybuf[2] = 'B';
		break;
	case SCAN_RIGHT: /* RIGHT */
		keybuf[0] = 0x1b;	/* esc */
		keybuf[1] = '[';
		keybuf[2] = 'C';
		break;
	case SCAN_LEFT: /* LEFT */
		keybuf[0] = 0x1b;	/* esc */
		keybuf[1] = '[';
		keybuf[2] = 'D';
		break;
	case SCAN_DELETE:
		keybuf[0] = CHAR_BACKSPACE;
		break;
	case SCAN_ESC:
		keybuf[0] = 0x1b;	/* esc */
		break;
	default:
		keybuf[0] = key->UnicodeChar;
		break;
	}
}

static bool
efi_readkey(SIMPLE_INPUT_INTERFACE *conin)
{
	EFI_STATUS status;
	EFI_INPUT_KEY key;

	status = conin->ReadKeyStroke(conin, &key);
	if (status == EFI_SUCCESS) {
		keybuf_inschar(&key);
		return (true);
	}
	return (false);
}

static bool
efi_readkey_ex(EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *coninex)
{
	EFI_STATUS status;
	EFI_INPUT_KEY *kp;
	EFI_KEY_DATA  key_data;
	uint32_t kss;

	status = coninex->ReadKeyStrokeEx(coninex, &key_data);
	if (status == EFI_SUCCESS) {
		kss = key_data.KeyState.KeyShiftState;
		kp = &key_data.Key;
		if (kss & EFI_SHIFT_STATE_VALID) {

			/*
			 * quick mapping to control chars, replace with
			 * map lookup later.
			 */
			if (kss & EFI_RIGHT_CONTROL_PRESSED ||
			    kss & EFI_LEFT_CONTROL_PRESSED) {
				if (kp->UnicodeChar >= 'a' &&
				    kp->UnicodeChar <= 'z') {
					kp->UnicodeChar -= 'a';
					kp->UnicodeChar++;
				}
			}
		}
		/*
		 * The shift state and/or toggle state may not be valid,
		 * but we still can have ScanCode or UnicodeChar.
		 */
		if (kp->ScanCode == 0 && kp->UnicodeChar == 0)
			return (false);
		keybuf_inschar(kp);
		return (true);
	}
	return (false);
}

static int
efi_cons_getchar(struct console *cp)
{
	struct efi_console_data *ecd;
	int c;

	if ((c = keybuf_getchar()) != 0)
		return (c);

	ecd = cp->c_private;
	key_pending = 0;

	if (ecd->ecd_coninex == NULL) {
		if (efi_readkey(ecd->ecd_conin))
			return (keybuf_getchar());
	} else {
		if (efi_readkey_ex(ecd->ecd_coninex))
			return (keybuf_getchar());
	}

	return (-1);
}

static int
efi_cons_poll(struct console *cp)
{
	struct efi_console_data *ecd;
	EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL *coninex;
	SIMPLE_INPUT_INTERFACE *conin;
	EFI_STATUS status;

	if (keybuf_ischar() || key_pending)
		return (1);

	ecd = cp->c_private;
	coninex = ecd->ecd_coninex;
	conin = ecd->ecd_conin;
	/*
	 * Some EFI implementation (u-boot for example) do not support
	 * WaitForKey().
	 * CheckEvent() can clear the signaled state.
	 */
	if (coninex != NULL) {
		if (coninex->WaitForKeyEx == NULL)
			key_pending = efi_readkey_ex(coninex);
		else {
			status = BS->CheckEvent(coninex->WaitForKeyEx);
			key_pending = status == EFI_SUCCESS;
		}
	} else {
		if (conin->WaitForKey == NULL)
			key_pending = efi_readkey(conin);
		else {
			status = BS->CheckEvent(conin->WaitForKey);
			key_pending = status == EFI_SUCCESS;
		}
	}

	return (key_pending);
}

/* Plain direct access to EFI OutputString(). */
void
efi_cons_efiputchar(int c)
{
	CHAR16 buf[2];
	EFI_STATUS status;

	buf[0] = c;
	buf[1] = 0;	/* terminate string */

	status = conout->TestString(conout, buf);
	if (EFI_ERROR(status))
		buf[0] = '?';
	conout->OutputString(conout, buf);
}

static void
efi_cons_devinfo_print(EFI_HANDLE handle)
{
	EFI_DEVICE_PATH *dp;
	CHAR16 *text;

	dp = efi_lookup_devpath(handle);
	if (dp == NULL)
		return;

	text = efi_devpath_name(dp);
	if (text == NULL)
		return;

	printf("\t%S", text);
	efi_free_devpath_name(text);
}

static void
efi_cons_devinfo(struct console *cp __unused)
{
	EFI_HANDLE *handles;
	UINTN nhandles;
	extern EFI_GUID gop_guid;
	extern EFI_GUID uga_guid;
	EFI_STATUS status;

	if (gop != NULL)
		status = BS->LocateHandleBuffer(ByProtocol, &gop_guid, NULL,
		    &nhandles, &handles);
	else
		status = BS->LocateHandleBuffer(ByProtocol, &uga_guid, NULL,
		    &nhandles, &handles);

	if (EFI_ERROR(status))
		return;

	for (UINTN i = 0; i < nhandles; i++)
		efi_cons_devinfo_print(handles[i]);

	BS->FreePool(handles);
}