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Date:      Wed, 25 Oct 2017 18:55:04 +0000 (UTC)
From:      Emmanuel Vadot <manu@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r324995 - in head/sys: arm64/include boot/efi/loader boot/efi/loader/arch/amd64
Message-ID:  <201710251855.v9PIt4bq009495@repo.freebsd.org>

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Author: manu
Date: Wed Oct 25 18:55:04 2017
New Revision: 324995
URL: https://svnweb.freebsd.org/changeset/base/324995

Log:
  loader.efi: Make framebuffer commands available for arm64
  
  Move framebuffer.{c,h} to sys/boot/efi/loader and add the efifb
  related metadata and pass it to the kernel
  
  Reviewed by:	imp, andrew
  Differential Revision:	https://reviews.freebsd.org/D12757

Added:
  head/sys/boot/efi/loader/framebuffer.c
     - copied unchanged from r324994, head/sys/boot/efi/loader/arch/amd64/framebuffer.c
  head/sys/boot/efi/loader/framebuffer.h
     - copied unchanged from r324994, head/sys/boot/efi/loader/arch/amd64/framebuffer.h
Deleted:
  head/sys/boot/efi/loader/arch/amd64/framebuffer.c
  head/sys/boot/efi/loader/arch/amd64/framebuffer.h
Modified:
  head/sys/arm64/include/metadata.h
  head/sys/boot/efi/loader/Makefile
  head/sys/boot/efi/loader/arch/amd64/Makefile.inc
  head/sys/boot/efi/loader/bootinfo.c

Modified: head/sys/arm64/include/metadata.h
==============================================================================
--- head/sys/arm64/include/metadata.h	Wed Oct 25 17:49:17 2017	(r324994)
+++ head/sys/arm64/include/metadata.h	Wed Oct 25 18:55:04 2017	(r324995)
@@ -31,11 +31,24 @@
 
 #define	MODINFOMD_EFI_MAP	0x1001
 #define	MODINFOMD_DTBP		0x1002
+#define	MODINFOMD_EFI_FB	0x1003
 
 struct efi_map_header {
 	size_t		memory_size;
 	size_t		descriptor_size;
 	uint32_t	descriptor_version;
+};
+
+struct efi_fb {
+	uint64_t	fb_addr;
+	uint64_t	fb_size;
+	uint32_t	fb_height;
+	uint32_t	fb_width;
+	uint32_t	fb_stride;
+	uint32_t	fb_mask_red;
+	uint32_t	fb_mask_green;
+	uint32_t	fb_mask_blue;
+	uint32_t	fb_mask_reserved;
 };
 
 #endif /* !_MACHINE_METADATA_H_ */

Modified: head/sys/boot/efi/loader/Makefile
==============================================================================
--- head/sys/boot/efi/loader/Makefile	Wed Oct 25 17:49:17 2017	(r324994)
+++ head/sys/boot/efi/loader/Makefile	Wed Oct 25 18:55:04 2017	(r324995)
@@ -22,6 +22,7 @@ SRCS=	autoload.c \
 	conf.c \
 	copy.c \
 	efi_main.c \
+	framebuffer.c \
 	main.c \
 	self_reloc.c \
 	smbios.c \

Modified: head/sys/boot/efi/loader/arch/amd64/Makefile.inc
==============================================================================
--- head/sys/boot/efi/loader/arch/amd64/Makefile.inc	Wed Oct 25 17:49:17 2017	(r324994)
+++ head/sys/boot/efi/loader/arch/amd64/Makefile.inc	Wed Oct 25 18:55:04 2017	(r324995)
@@ -2,7 +2,6 @@
 
 SRCS+=	amd64_tramp.S \
 	start.S \
-	framebuffer.c \
 	elf64_freebsd.c \
 	trap.c \
 	exc.S

Modified: head/sys/boot/efi/loader/bootinfo.c
==============================================================================
--- head/sys/boot/efi/loader/bootinfo.c	Wed Oct 25 17:49:17 2017	(r324994)
+++ head/sys/boot/efi/loader/bootinfo.c	Wed Oct 25 18:55:04 2017	(r324995)
@@ -48,9 +48,10 @@ __FBSDID("$FreeBSD$");
 
 #if defined(__amd64__)
 #include <machine/specialreg.h>
-#include "framebuffer.h"
 #endif
 
+#include "framebuffer.h"
+
 #if defined(LOADER_FDT_SUPPORT)
 #include <fdt_platform.h>
 #endif
@@ -247,12 +248,12 @@ bi_load_efi_data(struct preloaded_file *kfp)
 	UINT32 mmver;
 	struct efi_map_header *efihdr;
 
-#if defined(__amd64__)
+#if defined(__amd64__) || defined(__aarch64__)
 	struct efi_fb efifb;
 
 	if (efi_find_framebuffer(&efifb) == 0) {
 		printf("EFI framebuffer information:\n");
-		printf("addr, size     0x%lx, 0x%lx\n", efifb.fb_addr,
+		printf("addr, size     0x%jx, 0x%jx\n", efifb.fb_addr,
 		    efifb.fb_size);
 		printf("dimensions     %d x %d\n", efifb.fb_width,
 		    efifb.fb_height);

Copied: head/sys/boot/efi/loader/framebuffer.c (from r324994, head/sys/boot/efi/loader/arch/amd64/framebuffer.c)
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ head/sys/boot/efi/loader/framebuffer.c	Wed Oct 25 18:55:04 2017	(r324995, copy of r324994, head/sys/boot/efi/loader/arch/amd64/framebuffer.c)
@@ -0,0 +1,568 @@
+/*-
+ * Copyright (c) 2013 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Benno Rice under sponsorship from
+ * the FreeBSD Foundation.
+ * 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>
+__FBSDID("$FreeBSD$");
+
+#include <bootstrap.h>
+#include <sys/endian.h>
+#include <stand.h>
+
+#include <efi.h>
+#include <efilib.h>
+#include <efiuga.h>
+#include <efipciio.h>
+#include <machine/metadata.h>
+
+#include "framebuffer.h"
+
+static EFI_GUID gop_guid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
+static EFI_GUID pciio_guid = EFI_PCI_IO_PROTOCOL_GUID;
+static EFI_GUID uga_guid = EFI_UGA_DRAW_PROTOCOL_GUID;
+
+static u_int
+efifb_color_depth(struct efi_fb *efifb)
+{
+	uint32_t mask;
+	u_int depth;
+
+	mask = efifb->fb_mask_red | efifb->fb_mask_green |
+	    efifb->fb_mask_blue | efifb->fb_mask_reserved;
+	if (mask == 0)
+		return (0);
+	for (depth = 1; mask != 1; depth++)
+		mask >>= 1;
+	return (depth);
+}
+
+static int
+efifb_mask_from_pixfmt(struct efi_fb *efifb, EFI_GRAPHICS_PIXEL_FORMAT pixfmt,
+    EFI_PIXEL_BITMASK *pixinfo)
+{
+	int result;
+
+	result = 0;
+	switch (pixfmt) {
+	case PixelRedGreenBlueReserved8BitPerColor:
+		efifb->fb_mask_red = 0x000000ff;
+		efifb->fb_mask_green = 0x0000ff00;
+		efifb->fb_mask_blue = 0x00ff0000;
+		efifb->fb_mask_reserved = 0xff000000;
+		break;
+	case PixelBlueGreenRedReserved8BitPerColor:
+		efifb->fb_mask_red = 0x00ff0000;
+		efifb->fb_mask_green = 0x0000ff00;
+		efifb->fb_mask_blue = 0x000000ff;
+		efifb->fb_mask_reserved = 0xff000000;
+		break;
+	case PixelBitMask:
+		efifb->fb_mask_red = pixinfo->RedMask;
+		efifb->fb_mask_green = pixinfo->GreenMask;
+		efifb->fb_mask_blue = pixinfo->BlueMask;
+		efifb->fb_mask_reserved = pixinfo->ReservedMask;
+		break;
+	default:
+		result = 1;
+		break;
+	}
+	return (result);
+}
+
+static int
+efifb_from_gop(struct efi_fb *efifb, EFI_GRAPHICS_OUTPUT_PROTOCOL_MODE *mode,
+    EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *info)
+{
+	int result;
+
+	efifb->fb_addr = mode->FrameBufferBase;
+	efifb->fb_size = mode->FrameBufferSize;
+	efifb->fb_height = info->VerticalResolution;
+	efifb->fb_width = info->HorizontalResolution;
+	efifb->fb_stride = info->PixelsPerScanLine;
+	result = efifb_mask_from_pixfmt(efifb, info->PixelFormat,
+	    &info->PixelInformation);
+	return (result);
+}
+
+static ssize_t
+efifb_uga_find_pixel(EFI_UGA_DRAW_PROTOCOL *uga, u_int line,
+    EFI_PCI_IO_PROTOCOL *pciio, uint64_t addr, uint64_t size)
+{
+	EFI_UGA_PIXEL pix0, pix1;
+	uint8_t *data1, *data2;
+	size_t count, maxcount = 1024;
+	ssize_t ofs;
+	EFI_STATUS status;
+	u_int idx;
+
+	status = uga->Blt(uga, &pix0, EfiUgaVideoToBltBuffer,
+	    0, line, 0, 0, 1, 1, 0);
+	if (EFI_ERROR(status)) {
+		printf("UGA BLT operation failed (video->buffer)");
+		return (-1);
+	}
+	pix1.Red = ~pix0.Red;
+	pix1.Green = ~pix0.Green;
+	pix1.Blue = ~pix0.Blue;
+	pix1.Reserved = 0;
+
+	data1 = calloc(maxcount, 2);
+	if (data1 == NULL) {
+		printf("Unable to allocate memory");
+		return (-1);
+	}
+	data2 = data1 + maxcount;
+
+	ofs = 0;
+	while (size > 0) {
+		count = min(size, maxcount);
+
+		status = pciio->Mem.Read(pciio, EfiPciIoWidthUint32,
+		    EFI_PCI_IO_PASS_THROUGH_BAR, addr + ofs, count >> 2,
+		    data1);
+		if (EFI_ERROR(status)) {
+			printf("Error reading frame buffer (before)");
+			goto fail;
+		}
+		status = uga->Blt(uga, &pix1, EfiUgaBltBufferToVideo,
+		    0, 0, 0, line, 1, 1, 0);
+		if (EFI_ERROR(status)) {
+			printf("UGA BLT operation failed (modify)");
+			goto fail;
+		}
+		status = pciio->Mem.Read(pciio, EfiPciIoWidthUint32,
+		    EFI_PCI_IO_PASS_THROUGH_BAR, addr + ofs, count >> 2,
+		    data2);
+		if (EFI_ERROR(status)) {
+			printf("Error reading frame buffer (after)");
+			goto fail;
+		}
+		status = uga->Blt(uga, &pix0, EfiUgaBltBufferToVideo,
+		    0, 0, 0, line, 1, 1, 0);
+		if (EFI_ERROR(status)) {
+			printf("UGA BLT operation failed (restore)");
+			goto fail;
+		}
+		for (idx = 0; idx < count; idx++) {
+			if (data1[idx] != data2[idx]) {
+				free(data1);
+				return (ofs + (idx & ~3));
+			}
+		}
+		ofs += count;
+		size -= count;
+	}
+	printf("No change detected in frame buffer");
+
+ fail:
+	printf(" -- error %lu\n", EFI_ERROR_CODE(status));
+	free(data1);
+	return (-1);
+}
+
+static EFI_PCI_IO_PROTOCOL *
+efifb_uga_get_pciio(void)
+{
+	EFI_PCI_IO_PROTOCOL *pciio;
+	EFI_HANDLE *buf, *hp;
+	EFI_STATUS status;
+	UINTN bufsz;
+
+	/* Get all handles that support the UGA protocol. */
+	bufsz = 0;
+	status = BS->LocateHandle(ByProtocol, &uga_guid, NULL, &bufsz, NULL);
+	if (status != EFI_BUFFER_TOO_SMALL)
+		return (NULL);
+	buf = malloc(bufsz);
+	status = BS->LocateHandle(ByProtocol, &uga_guid, NULL, &bufsz, buf);
+	if (status != EFI_SUCCESS) {
+		free(buf);
+		return (NULL);
+	}
+	bufsz /= sizeof(EFI_HANDLE);
+
+	/* Get the PCI I/O interface of the first handle that supports it. */
+	pciio = NULL;
+	for (hp = buf; hp < buf + bufsz; hp++) {
+		status = BS->HandleProtocol(*hp, &pciio_guid, (void **)&pciio);
+		if (status == EFI_SUCCESS) {
+			free(buf);
+			return (pciio);
+		}
+	}
+	free(buf);
+	return (NULL);
+}
+
+static EFI_STATUS
+efifb_uga_locate_framebuffer(EFI_PCI_IO_PROTOCOL *pciio, uint64_t *addrp,
+    uint64_t *sizep)
+{
+	uint8_t *resattr;
+	uint64_t addr, size;
+	EFI_STATUS status;
+	u_int bar;
+
+	if (pciio == NULL)
+		return (EFI_DEVICE_ERROR);
+
+	/* Attempt to get the frame buffer address (imprecise). */
+	*addrp = 0;
+	*sizep = 0;
+	for (bar = 0; bar < 6; bar++) {
+		status = pciio->GetBarAttributes(pciio, bar, NULL,
+		    (void **)&resattr);
+		if (status != EFI_SUCCESS)
+			continue;
+		/* XXX magic offsets and constants. */
+		if (resattr[0] == 0x87 && resattr[3] == 0) {
+			/* 32-bit address space descriptor (MEMIO) */
+			addr = le32dec(resattr + 10);
+			size = le32dec(resattr + 22);
+		} else if (resattr[0] == 0x8a && resattr[3] == 0) {
+			/* 64-bit address space descriptor (MEMIO) */
+			addr = le64dec(resattr + 14);
+			size = le64dec(resattr + 38);
+		} else {
+			addr = 0;
+			size = 0;
+		}
+		BS->FreePool(resattr);
+		if (addr == 0 || size == 0)
+			continue;
+
+		/* We assume the largest BAR is the frame buffer. */
+		if (size > *sizep) {
+			*addrp = addr;
+			*sizep = size;
+		}
+	}
+	return ((*addrp == 0 || *sizep == 0) ? EFI_DEVICE_ERROR : 0);
+}
+
+static int
+efifb_from_uga(struct efi_fb *efifb, EFI_UGA_DRAW_PROTOCOL *uga)
+{
+	EFI_PCI_IO_PROTOCOL *pciio;
+	char *ev, *p;
+	EFI_STATUS status;
+	ssize_t offset;
+	uint64_t fbaddr;
+	uint32_t horiz, vert, stride;
+	uint32_t np, depth, refresh;
+
+	status = uga->GetMode(uga, &horiz, &vert, &depth, &refresh);
+	if (EFI_ERROR(status))
+		return (1);
+	efifb->fb_height = vert;
+	efifb->fb_width = horiz;
+	/* Paranoia... */
+	if (efifb->fb_height == 0 || efifb->fb_width == 0)
+		return (1);
+
+	/* The color masks are fixed AFAICT. */
+	efifb_mask_from_pixfmt(efifb, PixelBlueGreenRedReserved8BitPerColor,
+	    NULL);
+
+	/* pciio can be NULL on return! */
+	pciio = efifb_uga_get_pciio();
+
+	/* Try to find the frame buffer. */
+	status = efifb_uga_locate_framebuffer(pciio, &efifb->fb_addr,
+	    &efifb->fb_size);
+	if (EFI_ERROR(status)) {
+		efifb->fb_addr = 0;
+		efifb->fb_size = 0;
+	}
+
+	/*
+	 * There's no reliable way to detect the frame buffer or the
+	 * offset within the frame buffer of the visible region, nor
+	 * the stride. Our only option is to look at the system and
+	 * fill in the blanks based on that. Luckily, UGA was mostly
+	 * only used on Apple hardware.
+	 */
+	offset = -1;
+	ev = getenv("smbios.system.maker");
+	if (ev != NULL && !strcmp(ev, "Apple Inc.")) {
+		ev = getenv("smbios.system.product");
+		if (ev != NULL && !strcmp(ev, "iMac7,1")) {
+			/* These are the expected values we should have. */
+			horiz = 1680;
+			vert = 1050;
+			fbaddr = 0xc0000000;
+			/* These are the missing bits. */
+			offset = 0x10000;
+			stride = 1728;
+		} else if (ev != NULL && !strcmp(ev, "MacBook3,1")) {
+			/* These are the expected values we should have. */
+			horiz = 1280;
+			vert = 800;
+			fbaddr = 0xc0000000;
+			/* These are the missing bits. */
+			offset = 0x0;
+			stride = 2048;
+		}
+	}
+
+	/*
+	 * If this is hardware we know, make sure that it looks familiar
+	 * before we accept our hardcoded values.
+	 */
+	if (offset >= 0 && efifb->fb_width == horiz &&
+	    efifb->fb_height == vert && efifb->fb_addr == fbaddr) {
+		efifb->fb_addr += offset;
+		efifb->fb_size -= offset;
+		efifb->fb_stride = stride;
+		return (0);
+	} else if (offset >= 0) {
+		printf("Hardware make/model known, but graphics not "
+		    "as expected.\n");
+		printf("Console may not work!\n");
+	}
+
+	/*
+	 * The stride is equal or larger to the width. Often it's the
+	 * next larger power of two. We'll start with that...
+	 */
+	efifb->fb_stride = efifb->fb_width;
+	do {
+		np = efifb->fb_stride & (efifb->fb_stride - 1);
+		if (np) {
+			efifb->fb_stride |= (np - 1);
+			efifb->fb_stride++;
+		}
+	} while (np);
+
+	ev = getenv("hw.efifb.address");
+	if (ev == NULL) {
+		if (efifb->fb_addr == 0) {
+			printf("Please set hw.efifb.address and "
+			    "hw.efifb.stride.\n");
+			return (1);
+		}
+
+		/*
+		 * The visible part of the frame buffer may not start at
+		 * offset 0, so try to detect it. Note that we may not
+		 * always be able to read from the frame buffer, which
+		 * means that we may not be able to detect anything. In
+		 * that case, we would take a long time scanning for a
+		 * pixel change in the frame buffer, which would have it
+		 * appear that we're hanging, so we limit the scan to
+		 * 1/256th of the frame buffer. This number is mostly
+		 * based on PR 202730 and the fact that on a MacBoook,
+		 * where we can't read from the frame buffer the offset
+		 * of the visible region is 0. In short: we want to scan
+		 * enough to handle all adapters that have an offset
+		 * larger than 0 and we want to scan as little as we can
+		 * to not appear to hang when we can't read from the
+		 * frame buffer.
+		 */
+		offset = efifb_uga_find_pixel(uga, 0, pciio, efifb->fb_addr,
+		    efifb->fb_size >> 8);
+		if (offset == -1) {
+			printf("Unable to reliably detect frame buffer.\n");
+		} else if (offset > 0) {
+			efifb->fb_addr += offset;
+			efifb->fb_size -= offset;
+		}
+	} else {
+		offset = 0;
+		efifb->fb_size = efifb->fb_height * efifb->fb_stride * 4;
+		efifb->fb_addr = strtoul(ev, &p, 0);
+		if (*p != '\0')
+			return (1);
+	}
+
+	ev = getenv("hw.efifb.stride");
+	if (ev == NULL) {
+		if (pciio != NULL && offset != -1) {
+			/* Determine the stride. */
+			offset = efifb_uga_find_pixel(uga, 1, pciio,
+			    efifb->fb_addr, horiz * 8);
+			if (offset != -1)
+				efifb->fb_stride = offset >> 2;
+		} else {
+			printf("Unable to reliably detect the stride.\n");
+		}
+	} else {
+		efifb->fb_stride = strtoul(ev, &p, 0);
+		if (*p != '\0')
+			return (1);
+	}
+
+	/*
+	 * We finalized on the stride, so recalculate the size of the
+	 * frame buffer.
+	 */
+	efifb->fb_size = efifb->fb_height * efifb->fb_stride * 4;
+	return (0);
+}
+
+int
+efi_find_framebuffer(struct efi_fb *efifb)
+{
+	EFI_GRAPHICS_OUTPUT *gop;
+	EFI_UGA_DRAW_PROTOCOL *uga;
+	EFI_STATUS status;
+
+	status = BS->LocateProtocol(&gop_guid, NULL, (VOID **)&gop);
+	if (status == EFI_SUCCESS)
+		return (efifb_from_gop(efifb, gop->Mode, gop->Mode->Info));
+
+	status = BS->LocateProtocol(&uga_guid, NULL, (VOID **)&uga);
+	if (status == EFI_SUCCESS)
+		return (efifb_from_uga(efifb, uga));
+
+	return (1);
+}
+
+static void
+print_efifb(int mode, struct efi_fb *efifb, int verbose)
+{
+	u_int depth;
+
+	if (mode >= 0)
+		printf("mode %d: ", mode);
+	depth = efifb_color_depth(efifb);
+	printf("%ux%ux%u, stride=%u", efifb->fb_width, efifb->fb_height,
+	    depth, efifb->fb_stride);
+	if (verbose) {
+		printf("\n    frame buffer: address=%jx, size=%jx",
+		    (uintmax_t)efifb->fb_addr, (uintmax_t)efifb->fb_size);
+		printf("\n    color mask: R=%08x, G=%08x, B=%08x\n",
+		    efifb->fb_mask_red, efifb->fb_mask_green,
+		    efifb->fb_mask_blue);
+	}
+}
+
+COMMAND_SET(gop, "gop", "graphics output protocol", command_gop);
+
+static int
+command_gop(int argc, char *argv[])
+{
+	struct efi_fb efifb;
+	EFI_GRAPHICS_OUTPUT *gop;
+	EFI_STATUS status;
+	u_int mode;
+
+	status = BS->LocateProtocol(&gop_guid, NULL, (VOID **)&gop);
+	if (EFI_ERROR(status)) {
+		snprintf(command_errbuf, sizeof(command_errbuf),
+		    "%s: Graphics Output Protocol not present (error=%lu)",
+		    argv[0], EFI_ERROR_CODE(status));
+		return (CMD_ERROR);
+	}
+
+	if (argc < 2)
+		goto usage;
+
+	if (!strcmp(argv[1], "set")) {
+		char *cp;
+
+		if (argc != 3)
+			goto usage;
+		mode = strtol(argv[2], &cp, 0);
+		if (cp[0] != '\0') {
+			sprintf(command_errbuf, "mode is an integer");
+			return (CMD_ERROR);
+		}
+		status = gop->SetMode(gop, mode);
+		if (EFI_ERROR(status)) {
+			snprintf(command_errbuf, sizeof(command_errbuf),
+			    "%s: Unable to set mode to %u (error=%lu)",
+			    argv[0], mode, EFI_ERROR_CODE(status));
+			return (CMD_ERROR);
+		}
+	} else if (!strcmp(argv[1], "get")) {
+		if (argc != 2)
+			goto usage;
+		efifb_from_gop(&efifb, gop->Mode, gop->Mode->Info);
+		print_efifb(gop->Mode->Mode, &efifb, 1);
+		printf("\n");
+	} else if (!strcmp(argv[1], "list")) {
+		EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *info;
+		UINTN infosz;
+
+		if (argc != 2)
+			goto usage;
+		pager_open();
+		for (mode = 0; mode < gop->Mode->MaxMode; mode++) {
+			status = gop->QueryMode(gop, mode, &infosz, &info);
+			if (EFI_ERROR(status))
+				continue;
+			efifb_from_gop(&efifb, gop->Mode, info);
+			print_efifb(mode, &efifb, 0);
+			if (pager_output("\n"))
+				break;
+		}
+		pager_close();
+	}
+	return (CMD_OK);
+
+ usage:
+	snprintf(command_errbuf, sizeof(command_errbuf),
+	    "usage: %s [list | get | set <mode>]", argv[0]);
+	return (CMD_ERROR);
+}
+
+COMMAND_SET(uga, "uga", "universal graphics adapter", command_uga);
+
+static int
+command_uga(int argc, char *argv[])
+{
+	struct efi_fb efifb;
+	EFI_UGA_DRAW_PROTOCOL *uga;
+	EFI_STATUS status;
+
+	status = BS->LocateProtocol(&uga_guid, NULL, (VOID **)&uga);
+	if (EFI_ERROR(status)) {
+		snprintf(command_errbuf, sizeof(command_errbuf),
+		    "%s: UGA Protocol not present (error=%lu)",
+		    argv[0], EFI_ERROR_CODE(status));
+		return (CMD_ERROR);
+	}
+
+	if (argc != 1)
+		goto usage;
+
+	if (efifb_from_uga(&efifb, uga) != CMD_OK) {
+		snprintf(command_errbuf, sizeof(command_errbuf),
+		    "%s: Unable to get UGA information", argv[0]);
+		return (CMD_ERROR);
+	}
+
+	print_efifb(-1, &efifb, 1);
+	printf("\n");
+	return (CMD_OK);
+
+ usage:
+	snprintf(command_errbuf, sizeof(command_errbuf), "usage: %s", argv[0]);
+	return (CMD_ERROR);
+}

Copied: head/sys/boot/efi/loader/framebuffer.h (from r324994, head/sys/boot/efi/loader/arch/amd64/framebuffer.h)
==============================================================================
--- /dev/null	00:00:00 1970	(empty, because file is newly added)
+++ head/sys/boot/efi/loader/framebuffer.h	Wed Oct 25 18:55:04 2017	(r324995, copy of r324994, head/sys/boot/efi/loader/arch/amd64/framebuffer.h)
@@ -0,0 +1,36 @@
+/*-
+ * Copyright (c) 2013 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Benno Rice under sponsorship from
+ * the FreeBSD Foundation.
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef	_EFIFB_H_
+#define	_EFIFB_H_
+
+int	efi_find_framebuffer(struct efi_fb *efifb);
+
+#endif /* _EFIFB_H_ */



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