drivers/pci/pci_rom.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2014 Google, Inc
  *
  * From coreboot, originally based on the Linux kernel (drivers/pci/pci.c).
  *
  * Modifications are:
  * Copyright (C) 2003-2004 Linux Networx
  * (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
  * Copyright (C) 2003-2006 Ronald G. Minnich <rminnich@gmail.com>
  * Copyright (C) 2004-2005 Li-Ta Lo <ollie@lanl.gov>
  * Copyright (C) 2005-2006 Tyan
  * (Written by Yinghai Lu <yhlu@tyan.com> for Tyan)
  * Copyright (C) 2005-2009 coresystems GmbH
  * (Written by Stefan Reinauer <stepan@coresystems.de> for coresystems GmbH)
  *
  * PCI Bus Services, see include/linux/pci.h for further explanation.
  *
  * Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter,
  * David Mosberger-Tang
  *
  * Copyright 1997 -- 1999 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
  */

 #define LOG_CATEGORY UCLASS_PCI

 #include <common.h>
 #include <bios_emul.h>
 #include <bootstage.h>
 #include <dm.h>
 #include <errno.h>
 #include <init.h>
 #include <log.h>
 #include <malloc.h>
 #include <pci.h>
 #include <pci_rom.h>
 #include <vbe.h>
 #include <video.h>
 #include <video_fb.h>
 #include <acpi/acpi_s3.h>
 #include <linux/screen_info.h>

 DECLARE_GLOBAL_DATA_PTR;

 __weak bool board_should_run_oprom(struct udevice *dev)
 {
 #if defined(CONFIG_X86) && defined(CONFIG_HAVE_ACPI_RESUME)
 	if (gd->arch.prev_sleep_state == ACPI_S3) {
 		if (IS_ENABLED(CONFIG_S3_VGA_ROM_RUN))
 			return true;
 		else
 			return false;
 	}
 #endif

 	return true;
 }

 __weak bool board_should_load_oprom(struct udevice *dev)
 {
 	return true;
 }

 __weak uint32_t board_map_oprom_vendev(uint32_t vendev)
 {
 	return vendev;
 }

 static int pci_rom_probe(struct udevice *dev, struct pci_rom_header **hdrp)
 {
 	struct pci_child_plat *pplat = dev_get_parent_plat(dev);
 	struct pci_rom_header *rom_header;
 	struct pci_rom_data *rom_data;
 	u16 rom_vendor, rom_device;
 	u32 rom_class;
 	u32 vendev;
 	u32 mapped_vendev;
 	u32 rom_address;

 	vendev = pplat->vendor << 16 | pplat->device;
 	mapped_vendev = board_map_oprom_vendev(vendev);
 	if (vendev != mapped_vendev)
 		debug("Device ID mapped to %#08x\n", mapped_vendev);

 #ifdef CONFIG_VGA_BIOS_ADDR
 	rom_address = CONFIG_VGA_BIOS_ADDR;
 #else

 	dm_pci_read_config32(dev, PCI_ROM_ADDRESS, &rom_address);
 	if (rom_address == 0x00000000 || rom_address == 0xffffffff) {
 		debug("%s: rom_address=%x\n", __func__, rom_address);
 		return -ENOENT;
 	}

 	/* Enable expansion ROM address decoding. */
 	dm_pci_write_config32(dev, PCI_ROM_ADDRESS,
 			      rom_address | PCI_ROM_ADDRESS_ENABLE);
 #endif
 	debug("Option ROM address %x\n", rom_address);
 	rom_header = (struct pci_rom_header *)(unsigned long)rom_address;

 	debug("PCI expansion ROM, signature %#04x, INIT size %#04x, data ptr %#04x\n",
 	      le16_to_cpu(rom_header->signature),
 	      rom_header->size * 512, le16_to_cpu(rom_header->data));

 	if (le16_to_cpu(rom_header->signature) != PCI_ROM_HDR) {
 		printf("Incorrect expansion ROM header signature %04x\n",
 		       le16_to_cpu(rom_header->signature));
 #ifndef CONFIG_VGA_BIOS_ADDR
 		/* Disable expansion ROM address decoding */
 		dm_pci_write_config32(dev, PCI_ROM_ADDRESS, rom_address);
 #endif
 		return -EINVAL;
 	}

 	rom_data = (((void *)rom_header) + le16_to_cpu(rom_header->data));
 	rom_vendor = le16_to_cpu(rom_data->vendor);
 	rom_device = le16_to_cpu(rom_data->device);

 	debug("PCI ROM image, vendor ID %04x, device ID %04x,\n",
 	      rom_vendor, rom_device);

 	/* If the device id is mapped, a mismatch is expected */
 	if ((pplat->vendor != rom_vendor || pplat->device != rom_device) &&
 	    (vendev == mapped_vendev)) {
 		printf("ID mismatch: vendor ID %04x, device ID %04x\n",
 		       rom_vendor, rom_device);
 		/* Continue anyway */
 	}

 	rom_class = (le16_to_cpu(rom_data->class_hi) << 8) | rom_data->class_lo;
 	debug("PCI ROM image, Class Code %06x, Code Type %02x\n",
 	      rom_class, rom_data->type);

 	if (pplat->class != rom_class) {
 		debug("Class Code mismatch ROM %06x, dev %06x\n",
 		      rom_class, pplat->class);
 	}
 	*hdrp = rom_header;

 	return 0;
 }

 /**
  * pci_rom_load() - Load a ROM image and return a pointer to it
  *
  * @rom_header:		Pointer to ROM image
  * @ram_headerp:	Returns a pointer to the image in RAM
  * @allocedp:		Returns true if @ram_headerp was allocated and needs
  *			to be freed
  * @return 0 if OK, -ve on error. Note that @allocedp is set up regardless of
  * the error state. Even if this function returns an error, it may have
  * allocated memory.
  */
 static int pci_rom_load(struct pci_rom_header *rom_header,
 			struct pci_rom_header **ram_headerp, bool *allocedp)
 {
 	struct pci_rom_data *rom_data;
 	unsigned int rom_size;
 	unsigned int image_size = 0;
 	void *target;

 	*allocedp = false;
 	do {
 		/* Get next image, until we see an x86 version */
 		rom_header = (struct pci_rom_header *)((void *)rom_header +
 							    image_size);

 		rom_data = (struct pci_rom_data *)((void *)rom_header +
 				le16_to_cpu(rom_header->data));

 		image_size = le16_to_cpu(rom_data->ilen) * 512;
 	} while ((rom_data->type != 0) && (rom_data->indicator == 0));

 	if (rom_data->type != 0)
 		return -EACCES;

 	rom_size = rom_header->size * 512;

 #ifdef PCI_VGA_RAM_IMAGE_START
 	target = (void *)PCI_VGA_RAM_IMAGE_START;
 #else
 	target = (void *)malloc(rom_size);
 	if (!target)
 		return -ENOMEM;
 	*allocedp = true;
 #endif
 	if (target != rom_header) {
 		ulong start = get_timer(0);

 		debug("Copying VGA ROM Image from %p to %p, 0x%x bytes\n",
 		      rom_header, target, rom_size);
 		memcpy(target, rom_header, rom_size);
 		if (memcmp(target, rom_header, rom_size)) {
 			printf("VGA ROM copy failed\n");
 			return -EFAULT;
 		}
 		debug("Copy took %lums\n", get_timer(start));
 	}
 	*ram_headerp = target;

 	return 0;
 }

 struct vbe_mode_info mode_info;

 void setup_video(struct screen_info *screen_info)
 {
 	struct vesa_mode_info *vesa = &mode_info.vesa;

 	/* Sanity test on VESA parameters */
 	if (!vesa->x_resolution || !vesa->y_resolution)
 		return;

 	screen_info->orig_video_isVGA = VIDEO_TYPE_VLFB;

 	screen_info->lfb_width = vesa->x_resolution;
 	screen_info->lfb_height = vesa->y_resolution;
 	screen_info->lfb_depth = vesa->bits_per_pixel;
 	screen_info->lfb_linelength = vesa->bytes_per_scanline;
 	screen_info->lfb_base = vesa->phys_base_ptr;
 	screen_info->lfb_size =
 		ALIGN(screen_info->lfb_linelength * screen_info->lfb_height,
 		      65536);
 	screen_info->lfb_size >>= 16;
 	screen_info->red_size = vesa->red_mask_size;
 	screen_info->red_pos = vesa->red_mask_pos;
 	screen_info->green_size = vesa->green_mask_size;
 	screen_info->green_pos = vesa->green_mask_pos;
 	screen_info->blue_size = vesa->blue_mask_size;
 	screen_info->blue_pos = vesa->blue_mask_pos;
 	screen_info->rsvd_size = vesa->reserved_mask_size;
 	screen_info->rsvd_pos = vesa->reserved_mask_pos;
 }

 int dm_pci_run_vga_bios(struct udevice *dev, int (*int15_handler)(void),
 			int exec_method)
 {
 	struct pci_child_plat *pplat = dev_get_parent_plat(dev);
 	struct pci_rom_header *rom = NULL, *ram = NULL;
 	int vesa_mode = -1;
 	bool emulate, alloced;
 	int ret;

 	/* Only execute VGA ROMs */
 	if (((pplat->class >> 8) ^ PCI_CLASS_DISPLAY_VGA) & 0xff00) {
 		debug("%s: Class %#x, should be %#x\n", __func__, pplat->class,
 		      PCI_CLASS_DISPLAY_VGA);
 		return -ENODEV;
 	}

 	if (!board_should_load_oprom(dev))
 		return log_msg_ret("Should not load OPROM", -ENXIO);

 	ret = pci_rom_probe(dev, &rom);
 	if (ret)
 		return ret;

 	ret = pci_rom_load(rom, &ram, &alloced);
 	if (ret)
 		goto err;

 	if (!board_should_run_oprom(dev)) {
 		ret = -ENXIO;
 		goto err;
 	}

 #if defined(CONFIG_FRAMEBUFFER_SET_VESA_MODE) && \
 		defined(CONFIG_FRAMEBUFFER_VESA_MODE)
 	vesa_mode = CONFIG_FRAMEBUFFER_VESA_MODE;
 #endif
 	debug("Selected vesa mode %#x\n", vesa_mode);

 	if (exec_method & PCI_ROM_USE_NATIVE) {
 #ifdef CONFIG_X86
 		emulate = false;
 #else
 		if (!(exec_method & PCI_ROM_ALLOW_FALLBACK)) {
 			printf("BIOS native execution is only available on x86\n");
 			ret = -ENOSYS;
 			goto err;
 		}
 		emulate = true;
 #endif
 	} else {
 #ifdef CONFIG_BIOSEMU
 		emulate = true;
 #else
 		if (!(exec_method & PCI_ROM_ALLOW_FALLBACK)) {
 			printf("BIOS emulation not available - see CONFIG_BIOSEMU\n");
 			ret = -ENOSYS;
 			goto err;
 		}
 		emulate = false;
 #endif
 	}

 	if (emulate) {
 #ifdef CONFIG_BIOSEMU
 		BE_VGAInfo *info;

 		ret = biosemu_setup(dev, &info);
 		if (ret)
 			goto err;
 		biosemu_set_interrupt_handler(0x15, int15_handler);
 		ret = biosemu_run(dev, (uchar *)ram, 1 << 16, info,
 				  true, vesa_mode, &mode_info);
 		if (ret)
 			goto err;
 #endif
 	} else {
 #if defined(CONFIG_X86) && (CONFIG_IS_ENABLED(X86_32BIT_INIT) || CONFIG_TPL)
 		bios_set_interrupt_handler(0x15, int15_handler);

 		bios_run_on_x86(dev, (unsigned long)ram, vesa_mode,
 				&mode_info);
 #endif
 	}
 	debug("Final vesa mode %#x\n", mode_info.video_mode);
 	ret = 0;

 err:
 	if (alloced)
 		free(ram);
 	return ret;
 }

 #ifdef CONFIG_DM_VIDEO
 int vbe_setup_video_priv(struct vesa_mode_info *vesa,
 			 struct video_priv *uc_priv,
 			 struct video_uc_plat *plat)
 {
 	if (!vesa->x_resolution)
 		return log_msg_ret("No x resolution", -ENXIO);
 	uc_priv->xsize = vesa->x_resolution;
 	uc_priv->ysize = vesa->y_resolution;
 	uc_priv->line_length = vesa->bytes_per_scanline;
 	switch (vesa->bits_per_pixel) {
 	case 32:
 	case 24:
 		uc_priv->bpix = VIDEO_BPP32;
 		break;
 	case 16:
 		uc_priv->bpix = VIDEO_BPP16;
 		break;
 	default:
 		return -EPROTONOSUPPORT;
 	}

 	/* Use double buffering if enabled */
 	if (IS_ENABLED(CONFIG_VIDEO_COPY)) {
 		if (!plat->base)
 			return log_msg_ret("copy", -ENFILE);
 		plat->copy_base = vesa->phys_base_ptr;
 	} else {
 		plat->base = vesa->phys_base_ptr;
 	}
 	log_debug("base = %lx, copy_base = %lx\n", plat->base, plat->copy_base);
 	plat->size = vesa->bytes_per_scanline * vesa->y_resolution;

 	return 0;
 }

 int vbe_setup_video(struct udevice *dev, int (*int15_handler)(void))
 {
 	struct video_uc_plat *plat = dev_get_uclass_plat(dev);
 	struct video_priv *uc_priv = dev_get_uclass_priv(dev);
 	int ret;

 	/* If we are running from EFI or coreboot, this can't work */
 	if (!ll_boot_init()) {
 		printf("Not available (previous bootloader prevents it)\n");
 		return -EPERM;
 	}
 	bootstage_start(BOOTSTAGE_ID_ACCUM_LCD, "vesa display");
 	ret = dm_pci_run_vga_bios(dev, int15_handler, PCI_ROM_USE_NATIVE |
 					PCI_ROM_ALLOW_FALLBACK);
 	bootstage_accum(BOOTSTAGE_ID_ACCUM_LCD);
 	if (ret) {
 		debug("failed to run video BIOS: %d\n", ret);
 		return ret;
 	}

 	ret = vbe_setup_video_priv(&mode_info.vesa, uc_priv, plat);
 	if (ret) {
 		if (ret == -ENFILE) {
 			/*
 			 * See video-uclass.c for how to set up reserved memory
 			 * in your video driver
 			 */
 			log_err("CONFIG_VIDEO_COPY enabled but driver '%s' set up no reserved memory\n",
 				dev->driver->name);
 		}

 		debug("No video mode configured\n");
 		return ret;
 	}

 	printf("Video: %dx%dx%d\n", uc_priv->xsize, uc_priv->ysize,
 	       mode_info.vesa.bits_per_pixel);

 	return 0;
 }
 #endif
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (C) 2014 Google, Inc
	*
	* From coreboot, originally based on the Linux kernel (drivers/pci/pci.c).
	*
	* Modifications are:
	* Copyright (C) 2003-2004 Linux Networx
	* (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
	* Copyright (C) 2003-2006 Ronald G. Minnich <rminnich@gmail.com>
	* Copyright (C) 2004-2005 Li-Ta Lo <ollie@lanl.gov>
	* Copyright (C) 2005-2006 Tyan
	* (Written by Yinghai Lu <yhlu@tyan.com> for Tyan)
	* Copyright (C) 2005-2009 coresystems GmbH
	* (Written by Stefan Reinauer <stepan@coresystems.de> for coresystems GmbH)
	*
	* PCI Bus Services, see include/linux/pci.h for further explanation.
	*
	* Copyright 1993 -- 1997 Drew Eckhardt, Frederic Potter,
	* David Mosberger-Tang
	*
	* Copyright 1997 -- 1999 Martin Mares <mj@atrey.karlin.mff.cuni.cz>
	*/

	#define LOG_CATEGORY UCLASS_PCI

	#include <common.h>
	#include <bios_emul.h>
	#include <bootstage.h>
	#include <dm.h>
	#include <errno.h>
	#include <init.h>
	#include <log.h>
	#include <malloc.h>
	#include <pci.h>
	#include <pci_rom.h>
	#include <vbe.h>
	#include <video.h>
	#include <video_fb.h>
	#include <acpi/acpi_s3.h>
	#include <linux/screen_info.h>

	DECLARE_GLOBAL_DATA_PTR;

	__weak bool board_should_run_oprom(struct udevice *dev)
	{
	#if defined(CONFIG_X86) && defined(CONFIG_HAVE_ACPI_RESUME)
	if (gd->arch.prev_sleep_state == ACPI_S3) {
	if (IS_ENABLED(CONFIG_S3_VGA_ROM_RUN))
	return true;
	else
	return false;
	}
	#endif

	return true;
	}

	__weak bool board_should_load_oprom(struct udevice *dev)
	{
	return true;
	}

	__weak uint32_t board_map_oprom_vendev(uint32_t vendev)
	{
	return vendev;
	}

	static int pci_rom_probe(struct udevice dev, struct pci_rom_header *hdrp)
	{
	struct pci_child_plat *pplat = dev_get_parent_plat(dev);
	struct pci_rom_header *rom_header;
	struct pci_rom_data *rom_data;
	u16 rom_vendor, rom_device;
	u32 rom_class;
	u32 vendev;
	u32 mapped_vendev;
	u32 rom_address;

	vendev = pplat->vendor << 16 \| pplat->device;
	mapped_vendev = board_map_oprom_vendev(vendev);
	if (vendev != mapped_vendev)
	debug("Device ID mapped to %#08x\n", mapped_vendev);

	#ifdef CONFIG_VGA_BIOS_ADDR
	rom_address = CONFIG_VGA_BIOS_ADDR;
	#else

	dm_pci_read_config32(dev, PCI_ROM_ADDRESS, &rom_address);
	if (rom_address == 0x00000000 \|\| rom_address == 0xffffffff) {
	debug("%s: rom_address=%x\n", __func__, rom_address);
	return -ENOENT;
	}

	/* Enable expansion ROM address decoding. */
	dm_pci_write_config32(dev, PCI_ROM_ADDRESS,
	rom_address \| PCI_ROM_ADDRESS_ENABLE);
	#endif
	debug("Option ROM address %x\n", rom_address);
	rom_header = (struct pci_rom_header *)(unsigned long)rom_address;

	debug("PCI expansion ROM, signature %#04x, INIT size %#04x, data ptr %#04x\n",
	le16_to_cpu(rom_header->signature),
	rom_header->size * 512, le16_to_cpu(rom_header->data));

	if (le16_to_cpu(rom_header->signature) != PCI_ROM_HDR) {
	printf("Incorrect expansion ROM header signature %04x\n",
	le16_to_cpu(rom_header->signature));
	#ifndef CONFIG_VGA_BIOS_ADDR
	/* Disable expansion ROM address decoding */
	dm_pci_write_config32(dev, PCI_ROM_ADDRESS, rom_address);
	#endif
	return -EINVAL;
	}

	rom_data = (((void *)rom_header) + le16_to_cpu(rom_header->data));
	rom_vendor = le16_to_cpu(rom_data->vendor);
	rom_device = le16_to_cpu(rom_data->device);

	debug("PCI ROM image, vendor ID %04x, device ID %04x,\n",
	rom_vendor, rom_device);

	/* If the device id is mapped, a mismatch is expected */
	if ((pplat->vendor != rom_vendor \|\| pplat->device != rom_device) &&
	(vendev == mapped_vendev)) {
	printf("ID mismatch: vendor ID %04x, device ID %04x\n",
	rom_vendor, rom_device);
	/* Continue anyway */
	}

	rom_class = (le16_to_cpu(rom_data->class_hi) << 8) \| rom_data->class_lo;
	debug("PCI ROM image, Class Code %06x, Code Type %02x\n",
	rom_class, rom_data->type);

	if (pplat->class != rom_class) {
	debug("Class Code mismatch ROM %06x, dev %06x\n",
	rom_class, pplat->class);
	}
	*hdrp = rom_header;

	return 0;
	}

	/**
	* pci_rom_load() - Load a ROM image and return a pointer to it
	*
	* @rom_header: Pointer to ROM image
	* @ram_headerp: Returns a pointer to the image in RAM
	* @allocedp: Returns true if @ram_headerp was allocated and needs
	* to be freed
	* @return 0 if OK, -ve on error. Note that @allocedp is set up regardless of
	* the error state. Even if this function returns an error, it may have
	* allocated memory.
	*/
	static int pci_rom_load(struct pci_rom_header *rom_header,
	struct pci_rom_header *ram_headerp, bool allocedp)
	{
	struct pci_rom_data *rom_data;
	unsigned int rom_size;
	unsigned int image_size = 0;
	void *target;

	*allocedp = false;
	do {
	/* Get next image, until we see an x86 version */
	rom_header = (struct pci_rom_header )((void )rom_header +
	image_size);

	rom_data = (struct pci_rom_data )((void )rom_header +
	le16_to_cpu(rom_header->data));

	image_size = le16_to_cpu(rom_data->ilen) * 512;
	} while ((rom_data->type != 0) && (rom_data->indicator == 0));

	if (rom_data->type != 0)
	return -EACCES;

	rom_size = rom_header->size * 512;

	#ifdef PCI_VGA_RAM_IMAGE_START
	target = (void *)PCI_VGA_RAM_IMAGE_START;
	#else
	target = (void *)malloc(rom_size);
	if (!target)
	return -ENOMEM;
	*allocedp = true;
	#endif
	if (target != rom_header) {
	ulong start = get_timer(0);

	debug("Copying VGA ROM Image from %p to %p, 0x%x bytes\n",
	rom_header, target, rom_size);
	memcpy(target, rom_header, rom_size);
	if (memcmp(target, rom_header, rom_size)) {
	printf("VGA ROM copy failed\n");
	return -EFAULT;
	}
	debug("Copy took %lums\n", get_timer(start));
	}
	*ram_headerp = target;

	return 0;
	}

	struct vbe_mode_info mode_info;

	void setup_video(struct screen_info *screen_info)
	{
	struct vesa_mode_info *vesa = &mode_info.vesa;

	/* Sanity test on VESA parameters */
	if (!vesa->x_resolution \|\| !vesa->y_resolution)
	return;

	screen_info->orig_video_isVGA = VIDEO_TYPE_VLFB;

	screen_info->lfb_width = vesa->x_resolution;
	screen_info->lfb_height = vesa->y_resolution;
	screen_info->lfb_depth = vesa->bits_per_pixel;
	screen_info->lfb_linelength = vesa->bytes_per_scanline;
	screen_info->lfb_base = vesa->phys_base_ptr;
	screen_info->lfb_size =
	ALIGN(screen_info->lfb_linelength * screen_info->lfb_height,
	65536);
	screen_info->lfb_size >>= 16;
	screen_info->red_size = vesa->red_mask_size;
	screen_info->red_pos = vesa->red_mask_pos;
	screen_info->green_size = vesa->green_mask_size;
	screen_info->green_pos = vesa->green_mask_pos;
	screen_info->blue_size = vesa->blue_mask_size;
	screen_info->blue_pos = vesa->blue_mask_pos;
	screen_info->rsvd_size = vesa->reserved_mask_size;
	screen_info->rsvd_pos = vesa->reserved_mask_pos;
	}

	int dm_pci_run_vga_bios(struct udevice dev, int (int15_handler)(void),
	int exec_method)
	{
	struct pci_child_plat *pplat = dev_get_parent_plat(dev);
	struct pci_rom_header rom = NULL, ram = NULL;
	int vesa_mode = -1;
	bool emulate, alloced;
	int ret;

	/* Only execute VGA ROMs */
	if (((pplat->class >> 8) ^ PCI_CLASS_DISPLAY_VGA) & 0xff00) {
	debug("%s: Class %#x, should be %#x\n", __func__, pplat->class,
	PCI_CLASS_DISPLAY_VGA);
	return -ENODEV;
	}

	if (!board_should_load_oprom(dev))
	return log_msg_ret("Should not load OPROM", -ENXIO);

	ret = pci_rom_probe(dev, &rom);
	if (ret)
	return ret;

	ret = pci_rom_load(rom, &ram, &alloced);
	if (ret)
	goto err;

	if (!board_should_run_oprom(dev)) {
	ret = -ENXIO;
	goto err;
	}

	#if defined(CONFIG_FRAMEBUFFER_SET_VESA_MODE) && \
	defined(CONFIG_FRAMEBUFFER_VESA_MODE)
	vesa_mode = CONFIG_FRAMEBUFFER_VESA_MODE;
	#endif
	debug("Selected vesa mode %#x\n", vesa_mode);

	if (exec_method & PCI_ROM_USE_NATIVE) {
	#ifdef CONFIG_X86
	emulate = false;
	#else
	if (!(exec_method & PCI_ROM_ALLOW_FALLBACK)) {
	printf("BIOS native execution is only available on x86\n");
	ret = -ENOSYS;
	goto err;
	}
	emulate = true;
	#endif
	} else {
	#ifdef CONFIG_BIOSEMU
	emulate = true;
	#else
	if (!(exec_method & PCI_ROM_ALLOW_FALLBACK)) {
	printf("BIOS emulation not available - see CONFIG_BIOSEMU\n");
	ret = -ENOSYS;
	goto err;
	}
	emulate = false;
	#endif
	}

	if (emulate) {
	#ifdef CONFIG_BIOSEMU
	BE_VGAInfo *info;

	ret = biosemu_setup(dev, &info);
	if (ret)
	goto err;
	biosemu_set_interrupt_handler(0x15, int15_handler);
	ret = biosemu_run(dev, (uchar *)ram, 1 << 16, info,
	true, vesa_mode, &mode_info);
	if (ret)
	goto err;
	#endif
	} else {
	#if defined(CONFIG_X86) && (CONFIG_IS_ENABLED(X86_32BIT_INIT) \|\| CONFIG_TPL)
	bios_set_interrupt_handler(0x15, int15_handler);

	bios_run_on_x86(dev, (unsigned long)ram, vesa_mode,
	&mode_info);
	#endif
	}
	debug("Final vesa mode %#x\n", mode_info.video_mode);
	ret = 0;

	err:
	if (alloced)
	free(ram);
	return ret;
	}

	#ifdef CONFIG_DM_VIDEO
	int vbe_setup_video_priv(struct vesa_mode_info *vesa,
	struct video_priv *uc_priv,
	struct video_uc_plat *plat)
	{
	if (!vesa->x_resolution)
	return log_msg_ret("No x resolution", -ENXIO);
	uc_priv->xsize = vesa->x_resolution;
	uc_priv->ysize = vesa->y_resolution;
	uc_priv->line_length = vesa->bytes_per_scanline;
	switch (vesa->bits_per_pixel) {
	case 32:
	case 24:
	uc_priv->bpix = VIDEO_BPP32;
	break;
	case 16:
	uc_priv->bpix = VIDEO_BPP16;
	break;
	default:
	return -EPROTONOSUPPORT;
	}

	/* Use double buffering if enabled */
	if (IS_ENABLED(CONFIG_VIDEO_COPY)) {
	if (!plat->base)
	return log_msg_ret("copy", -ENFILE);
	plat->copy_base = vesa->phys_base_ptr;
	} else {
	plat->base = vesa->phys_base_ptr;
	}
	log_debug("base = %lx, copy_base = %lx\n", plat->base, plat->copy_base);
	plat->size = vesa->bytes_per_scanline * vesa->y_resolution;

	return 0;
	}

	int vbe_setup_video(struct udevice dev, int (int15_handler)(void))
	{
	struct video_uc_plat *plat = dev_get_uclass_plat(dev);
	struct video_priv *uc_priv = dev_get_uclass_priv(dev);
	int ret;

	/* If we are running from EFI or coreboot, this can't work */
	if (!ll_boot_init()) {
	printf("Not available (previous bootloader prevents it)\n");
	return -EPERM;
	}
	bootstage_start(BOOTSTAGE_ID_ACCUM_LCD, "vesa display");
	ret = dm_pci_run_vga_bios(dev, int15_handler, PCI_ROM_USE_NATIVE \|
	PCI_ROM_ALLOW_FALLBACK);
	bootstage_accum(BOOTSTAGE_ID_ACCUM_LCD);
	if (ret) {
	debug("failed to run video BIOS: %d\n", ret);
	return ret;
	}

	ret = vbe_setup_video_priv(&mode_info.vesa, uc_priv, plat);
	if (ret) {
	if (ret == -ENFILE) {
	/*
	* See video-uclass.c for how to set up reserved memory
	* in your video driver
	*/
	log_err("CONFIG_VIDEO_COPY enabled but driver '%s' set up no reserved memory\n",
	dev->driver->name);
	}

	debug("No video mode configured\n");
	return ret;
	}

	printf("Video: %dx%dx%d\n", uc_priv->xsize, uc_priv->ysize,
	mode_info.vesa.bits_per_pixel);

	return 0;
	}
	#endif