drivers/firmware/efi/libstub/gop.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /* -----------------------------------------------------------------------
  *
  *   Copyright 2011 Intel Corporation; author Matt Fleming
  *
  * ----------------------------------------------------------------------- */

 #include <linux/efi.h>
 #include <linux/screen_info.h>
 #include <asm/efi.h>
 #include <asm/setup.h>

 static void find_bits(unsigned long mask, u8 *pos, u8 *size)
 {
 	u8 first, len;

 	first = 0;
 	len = 0;

 	if (mask) {
 		while (!(mask & 0x1)) {
 			mask = mask >> 1;
 			first++;
 		}

 		while (mask & 0x1) {
 			mask = mask >> 1;
 			len++;
 		}
 	}

 	*pos = first;
 	*size = len;
 }

 static void
 setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line,
 		 struct efi_pixel_bitmask pixel_info, int pixel_format)
 {
 	if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
 		si->lfb_depth = 32;
 		si->lfb_linelength = pixels_per_scan_line * 4;
 		si->red_size = 8;
 		si->red_pos = 0;
 		si->green_size = 8;
 		si->green_pos = 8;
 		si->blue_size = 8;
 		si->blue_pos = 16;
 		si->rsvd_size = 8;
 		si->rsvd_pos = 24;
 	} else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
 		si->lfb_depth = 32;
 		si->lfb_linelength = pixels_per_scan_line * 4;
 		si->red_size = 8;
 		si->red_pos = 16;
 		si->green_size = 8;
 		si->green_pos = 8;
 		si->blue_size = 8;
 		si->blue_pos = 0;
 		si->rsvd_size = 8;
 		si->rsvd_pos = 24;
 	} else if (pixel_format == PIXEL_BIT_MASK) {
 		find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
 		find_bits(pixel_info.green_mask, &si->green_pos,
 			  &si->green_size);
 		find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
 		find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
 			  &si->rsvd_size);
 		si->lfb_depth = si->red_size + si->green_size +
 			si->blue_size + si->rsvd_size;
 		si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
 	} else {
 		si->lfb_depth = 4;
 		si->lfb_linelength = si->lfb_width / 2;
 		si->red_size = 0;
 		si->red_pos = 0;
 		si->green_size = 0;
 		si->green_pos = 0;
 		si->blue_size = 0;
 		si->blue_pos = 0;
 		si->rsvd_size = 0;
 		si->rsvd_pos = 0;
 	}
 }

 static efi_status_t
 __gop_query32(efi_system_table_t *sys_table_arg,
 	      struct efi_graphics_output_protocol_32 *gop32,
 	      struct efi_graphics_output_mode_info **info,
 	      unsigned long *size, u64 *fb_base)
 {
 	struct efi_graphics_output_protocol_mode_32 *mode;
 	efi_graphics_output_protocol_query_mode query_mode;
 	efi_status_t status;
 	unsigned long m;

 	m = gop32->mode;
 	mode = (struct efi_graphics_output_protocol_mode_32 *)m;
 	query_mode = (void *)(unsigned long)gop32->query_mode;

 	status = __efi_call_early(query_mode, (void *)gop32, mode->mode, size,
 				  info);
 	if (status != EFI_SUCCESS)
 		return status;

 	*fb_base = mode->frame_buffer_base;
 	return status;
 }

 static efi_status_t
 setup_gop32(efi_system_table_t *sys_table_arg, struct screen_info *si,
             efi_guid_t *proto, unsigned long size, void **gop_handle)
 {
 	struct efi_graphics_output_protocol_32 *gop32, *first_gop;
 	unsigned long nr_gops;
 	u16 width, height;
 	u32 pixels_per_scan_line;
 	u32 ext_lfb_base;
 	u64 fb_base;
 	struct efi_pixel_bitmask pixel_info;
 	int pixel_format;
 	efi_status_t status = EFI_NOT_FOUND;
 	u32 *handles = (u32 *)(unsigned long)gop_handle;
 	int i;

 	first_gop = NULL;
 	gop32 = NULL;

 	nr_gops = size / sizeof(u32);
 	for (i = 0; i < nr_gops; i++) {
 		struct efi_graphics_output_mode_info *info = NULL;
 		efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
 		bool conout_found = false;
 		void *dummy = NULL;
 		efi_handle_t h = (efi_handle_t)(unsigned long)handles[i];
 		u64 current_fb_base;

 		status = efi_call_early(handle_protocol, h,
 					proto, (void **)&gop32);
 		if (status != EFI_SUCCESS)
 			continue;

 		status = efi_call_early(handle_protocol, h,
 					&conout_proto, &dummy);
 		if (status == EFI_SUCCESS)
 			conout_found = true;

 		status = __gop_query32(sys_table_arg, gop32, &info, &size,
 				       &current_fb_base);
 		if (status == EFI_SUCCESS && (!first_gop || conout_found) &&
 		    info->pixel_format != PIXEL_BLT_ONLY) {
 			/*
 			 * Systems that use the UEFI Console Splitter may
 			 * provide multiple GOP devices, not all of which are
 			 * backed by real hardware. The workaround is to search
 			 * for a GOP implementing the ConOut protocol, and if
 			 * one isn't found, to just fall back to the first GOP.
 			 */
 			width = info->horizontal_resolution;
 			height = info->vertical_resolution;
 			pixel_format = info->pixel_format;
 			pixel_info = info->pixel_information;
 			pixels_per_scan_line = info->pixels_per_scan_line;
 			fb_base = current_fb_base;

 			/*
 			 * Once we've found a GOP supporting ConOut,
 			 * don't bother looking any further.
 			 */
 			first_gop = gop32;
 			if (conout_found)
 				break;
 		}
 	}

 	/* Did we find any GOPs? */
 	if (!first_gop)
 		goto out;

 	/* EFI framebuffer */
 	si->orig_video_isVGA = VIDEO_TYPE_EFI;

 	si->lfb_width = width;
 	si->lfb_height = height;
 	si->lfb_base = fb_base;

 	ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
 	if (ext_lfb_base) {
 		si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
 		si->ext_lfb_base = ext_lfb_base;
 	}

 	si->pages = 1;

 	setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);

 	si->lfb_size = si->lfb_linelength * si->lfb_height;

 	si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
 out:
 	return status;
 }

 static efi_status_t
 __gop_query64(efi_system_table_t *sys_table_arg,
 	      struct efi_graphics_output_protocol_64 *gop64,
 	      struct efi_graphics_output_mode_info **info,
 	      unsigned long *size, u64 *fb_base)
 {
 	struct efi_graphics_output_protocol_mode_64 *mode;
 	efi_graphics_output_protocol_query_mode query_mode;
 	efi_status_t status;
 	unsigned long m;

 	m = gop64->mode;
 	mode = (struct efi_graphics_output_protocol_mode_64 *)m;
 	query_mode = (void *)(unsigned long)gop64->query_mode;

 	status = __efi_call_early(query_mode, (void *)gop64, mode->mode, size,
 				  info);
 	if (status != EFI_SUCCESS)
 		return status;

 	*fb_base = mode->frame_buffer_base;
 	return status;
 }

 static efi_status_t
 setup_gop64(efi_system_table_t *sys_table_arg, struct screen_info *si,
 	    efi_guid_t *proto, unsigned long size, void **gop_handle)
 {
 	struct efi_graphics_output_protocol_64 *gop64, *first_gop;
 	unsigned long nr_gops;
 	u16 width, height;
 	u32 pixels_per_scan_line;
 	u32 ext_lfb_base;
 	u64 fb_base;
 	struct efi_pixel_bitmask pixel_info;
 	int pixel_format;
 	efi_status_t status = EFI_NOT_FOUND;
 	u64 *handles = (u64 *)(unsigned long)gop_handle;
 	int i;

 	first_gop = NULL;
 	gop64 = NULL;

 	nr_gops = size / sizeof(u64);
 	for (i = 0; i < nr_gops; i++) {
 		struct efi_graphics_output_mode_info *info = NULL;
 		efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
 		bool conout_found = false;
 		void *dummy = NULL;
 		efi_handle_t h = (efi_handle_t)(unsigned long)handles[i];
 		u64 current_fb_base;

 		status = efi_call_early(handle_protocol, h,
 					proto, (void **)&gop64);
 		if (status != EFI_SUCCESS)
 			continue;

 		status = efi_call_early(handle_protocol, h,
 					&conout_proto, &dummy);
 		if (status == EFI_SUCCESS)
 			conout_found = true;

 		status = __gop_query64(sys_table_arg, gop64, &info, &size,
 				       &current_fb_base);
 		if (status == EFI_SUCCESS && (!first_gop || conout_found) &&
 		    info->pixel_format != PIXEL_BLT_ONLY) {
 			/*
 			 * Systems that use the UEFI Console Splitter may
 			 * provide multiple GOP devices, not all of which are
 			 * backed by real hardware. The workaround is to search
 			 * for a GOP implementing the ConOut protocol, and if
 			 * one isn't found, to just fall back to the first GOP.
 			 */
 			width = info->horizontal_resolution;
 			height = info->vertical_resolution;
 			pixel_format = info->pixel_format;
 			pixel_info = info->pixel_information;
 			pixels_per_scan_line = info->pixels_per_scan_line;
 			fb_base = current_fb_base;

 			/*
 			 * Once we've found a GOP supporting ConOut,
 			 * don't bother looking any further.
 			 */
 			first_gop = gop64;
 			if (conout_found)
 				break;
 		}
 	}

 	/* Did we find any GOPs? */
 	if (!first_gop)
 		goto out;

 	/* EFI framebuffer */
 	si->orig_video_isVGA = VIDEO_TYPE_EFI;

 	si->lfb_width = width;
 	si->lfb_height = height;
 	si->lfb_base = fb_base;

 	ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
 	if (ext_lfb_base) {
 		si->capabilities |= VIDEO_CAPABILITY_64BIT_BASE;
 		si->ext_lfb_base = ext_lfb_base;
 	}

 	si->pages = 1;

 	setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);

 	si->lfb_size = si->lfb_linelength * si->lfb_height;

 	si->capabilities |= VIDEO_CAPABILITY_SKIP_QUIRKS;
 out:
 	return status;
 }

 /*
  * See if we have Graphics Output Protocol
  */
 efi_status_t efi_setup_gop(efi_system_table_t *sys_table_arg,
 			   struct screen_info *si, efi_guid_t *proto,
 			   unsigned long size)
 {
 	efi_status_t status;
 	void **gop_handle = NULL;

 	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
 				size, (void **)&gop_handle);
 	if (status != EFI_SUCCESS)
 		return status;

 	status = efi_call_early(locate_handle,
 				EFI_LOCATE_BY_PROTOCOL,
 				proto, NULL, &size, gop_handle);
 	if (status != EFI_SUCCESS)
 		goto free_handle;

 	if (efi_is_64bit()) {
 		status = setup_gop64(sys_table_arg, si, proto, size,
 				     gop_handle);
 	} else {
 		status = setup_gop32(sys_table_arg, si, proto, size,
 				     gop_handle);
 	}

 free_handle:
 	efi_call_early(free_pool, gop_handle);
 	return status;
 }
	// SPDX-License-Identifier: GPL-2.0
	/* -----------------------------------------------------------------------
	*
	* Copyright 2011 Intel Corporation; author Matt Fleming
	*
	* ----------------------------------------------------------------------- */

	#include <linux/efi.h>
	#include <linux/screen_info.h>
	#include <asm/efi.h>
	#include <asm/setup.h>

	static void find_bits(unsigned long mask, u8 pos, u8 size)
	{
	u8 first, len;

	first = 0;
	len = 0;

	if (mask) {
	while (!(mask & 0x1)) {
	mask = mask >> 1;
	first++;
	}

	while (mask & 0x1) {
	mask = mask >> 1;
	len++;
	}
	}

	*pos = first;
	*size = len;
	}

	static void
	setup_pixel_info(struct screen_info *si, u32 pixels_per_scan_line,
	struct efi_pixel_bitmask pixel_info, int pixel_format)
	{
	if (pixel_format == PIXEL_RGB_RESERVED_8BIT_PER_COLOR) {
	si->lfb_depth = 32;
	si->lfb_linelength = pixels_per_scan_line * 4;
	si->red_size = 8;
	si->red_pos = 0;
	si->green_size = 8;
	si->green_pos = 8;
	si->blue_size = 8;
	si->blue_pos = 16;
	si->rsvd_size = 8;
	si->rsvd_pos = 24;
	} else if (pixel_format == PIXEL_BGR_RESERVED_8BIT_PER_COLOR) {
	si->lfb_depth = 32;
	si->lfb_linelength = pixels_per_scan_line * 4;
	si->red_size = 8;
	si->red_pos = 16;
	si->green_size = 8;
	si->green_pos = 8;
	si->blue_size = 8;
	si->blue_pos = 0;
	si->rsvd_size = 8;
	si->rsvd_pos = 24;
	} else if (pixel_format == PIXEL_BIT_MASK) {
	find_bits(pixel_info.red_mask, &si->red_pos, &si->red_size);
	find_bits(pixel_info.green_mask, &si->green_pos,
	&si->green_size);
	find_bits(pixel_info.blue_mask, &si->blue_pos, &si->blue_size);
	find_bits(pixel_info.reserved_mask, &si->rsvd_pos,
	&si->rsvd_size);
	si->lfb_depth = si->red_size + si->green_size +
	si->blue_size + si->rsvd_size;
	si->lfb_linelength = (pixels_per_scan_line * si->lfb_depth) / 8;
	} else {
	si->lfb_depth = 4;
	si->lfb_linelength = si->lfb_width / 2;
	si->red_size = 0;
	si->red_pos = 0;
	si->green_size = 0;
	si->green_pos = 0;
	si->blue_size = 0;
	si->blue_pos = 0;
	si->rsvd_size = 0;
	si->rsvd_pos = 0;
	}
	}

	static efi_status_t
	__gop_query32(efi_system_table_t *sys_table_arg,
	struct efi_graphics_output_protocol_32 *gop32,
	struct efi_graphics_output_mode_info **info,
	unsigned long size, u64 fb_base)
	{
	struct efi_graphics_output_protocol_mode_32 *mode;
	efi_graphics_output_protocol_query_mode query_mode;
	efi_status_t status;
	unsigned long m;

	m = gop32->mode;
	mode = (struct efi_graphics_output_protocol_mode_32 *)m;
	query_mode = (void *)(unsigned long)gop32->query_mode;

	status = __efi_call_early(query_mode, (void *)gop32, mode->mode, size,
	info);
	if (status != EFI_SUCCESS)
	return status;

	*fb_base = mode->frame_buffer_base;
	return status;
	}

	static efi_status_t
	setup_gop32(efi_system_table_t sys_table_arg, struct screen_info si,
	efi_guid_t proto, unsigned long size, void *gop_handle)
	{
	struct efi_graphics_output_protocol_32 gop32, first_gop;
	unsigned long nr_gops;
	u16 width, height;
	u32 pixels_per_scan_line;
	u32 ext_lfb_base;
	u64 fb_base;
	struct efi_pixel_bitmask pixel_info;
	int pixel_format;
	efi_status_t status = EFI_NOT_FOUND;
	u32 handles = (u32 )(unsigned long)gop_handle;
	int i;

	first_gop = NULL;
	gop32 = NULL;

	nr_gops = size / sizeof(u32);
	for (i = 0; i < nr_gops; i++) {
	struct efi_graphics_output_mode_info *info = NULL;
	efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
	bool conout_found = false;
	void *dummy = NULL;
	efi_handle_t h = (efi_handle_t)(unsigned long)handles[i];
	u64 current_fb_base;

	status = efi_call_early(handle_protocol, h,
	proto, (void **)&gop32);
	if (status != EFI_SUCCESS)
	continue;

	status = efi_call_early(handle_protocol, h,
	&conout_proto, &dummy);
	if (status == EFI_SUCCESS)
	conout_found = true;

	status = __gop_query32(sys_table_arg, gop32, &info, &size,
	&current_fb_base);
	if (status == EFI_SUCCESS && (!first_gop \|\| conout_found) &&
	info->pixel_format != PIXEL_BLT_ONLY) {
	/*
	* Systems that use the UEFI Console Splitter may
	* provide multiple GOP devices, not all of which are
	* backed by real hardware. The workaround is to search
	* for a GOP implementing the ConOut protocol, and if
	* one isn't found, to just fall back to the first GOP.
	*/
	width = info->horizontal_resolution;
	height = info->vertical_resolution;
	pixel_format = info->pixel_format;
	pixel_info = info->pixel_information;
	pixels_per_scan_line = info->pixels_per_scan_line;
	fb_base = current_fb_base;

	/*
	* Once we've found a GOP supporting ConOut,
	* don't bother looking any further.
	*/
	first_gop = gop32;
	if (conout_found)
	break;
	}
	}

	/* Did we find any GOPs? */
	if (!first_gop)
	goto out;

	/* EFI framebuffer */
	si->orig_video_isVGA = VIDEO_TYPE_EFI;

	si->lfb_width = width;
	si->lfb_height = height;
	si->lfb_base = fb_base;

	ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
	if (ext_lfb_base) {
	si->capabilities \|= VIDEO_CAPABILITY_64BIT_BASE;
	si->ext_lfb_base = ext_lfb_base;
	}

	si->pages = 1;

	setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);

	si->lfb_size = si->lfb_linelength * si->lfb_height;

	si->capabilities \|= VIDEO_CAPABILITY_SKIP_QUIRKS;
	out:
	return status;
	}

	static efi_status_t
	__gop_query64(efi_system_table_t *sys_table_arg,
	struct efi_graphics_output_protocol_64 *gop64,
	struct efi_graphics_output_mode_info **info,
	unsigned long size, u64 fb_base)
	{
	struct efi_graphics_output_protocol_mode_64 *mode;
	efi_graphics_output_protocol_query_mode query_mode;
	efi_status_t status;
	unsigned long m;

	m = gop64->mode;
	mode = (struct efi_graphics_output_protocol_mode_64 *)m;
	query_mode = (void *)(unsigned long)gop64->query_mode;

	status = __efi_call_early(query_mode, (void *)gop64, mode->mode, size,
	info);
	if (status != EFI_SUCCESS)
	return status;

	*fb_base = mode->frame_buffer_base;
	return status;
	}

	static efi_status_t
	setup_gop64(efi_system_table_t sys_table_arg, struct screen_info si,
	efi_guid_t proto, unsigned long size, void *gop_handle)
	{
	struct efi_graphics_output_protocol_64 gop64, first_gop;
	unsigned long nr_gops;
	u16 width, height;
	u32 pixels_per_scan_line;
	u32 ext_lfb_base;
	u64 fb_base;
	struct efi_pixel_bitmask pixel_info;
	int pixel_format;
	efi_status_t status = EFI_NOT_FOUND;
	u64 handles = (u64 )(unsigned long)gop_handle;
	int i;

	first_gop = NULL;
	gop64 = NULL;

	nr_gops = size / sizeof(u64);
	for (i = 0; i < nr_gops; i++) {
	struct efi_graphics_output_mode_info *info = NULL;
	efi_guid_t conout_proto = EFI_CONSOLE_OUT_DEVICE_GUID;
	bool conout_found = false;
	void *dummy = NULL;
	efi_handle_t h = (efi_handle_t)(unsigned long)handles[i];
	u64 current_fb_base;

	status = efi_call_early(handle_protocol, h,
	proto, (void **)&gop64);
	if (status != EFI_SUCCESS)
	continue;

	status = efi_call_early(handle_protocol, h,
	&conout_proto, &dummy);
	if (status == EFI_SUCCESS)
	conout_found = true;

	status = __gop_query64(sys_table_arg, gop64, &info, &size,
	&current_fb_base);
	if (status == EFI_SUCCESS && (!first_gop \|\| conout_found) &&
	info->pixel_format != PIXEL_BLT_ONLY) {
	/*
	* Systems that use the UEFI Console Splitter may
	* provide multiple GOP devices, not all of which are
	* backed by real hardware. The workaround is to search
	* for a GOP implementing the ConOut protocol, and if
	* one isn't found, to just fall back to the first GOP.
	*/
	width = info->horizontal_resolution;
	height = info->vertical_resolution;
	pixel_format = info->pixel_format;
	pixel_info = info->pixel_information;
	pixels_per_scan_line = info->pixels_per_scan_line;
	fb_base = current_fb_base;

	/*
	* Once we've found a GOP supporting ConOut,
	* don't bother looking any further.
	*/
	first_gop = gop64;
	if (conout_found)
	break;
	}
	}

	/* Did we find any GOPs? */
	if (!first_gop)
	goto out;

	/* EFI framebuffer */
	si->orig_video_isVGA = VIDEO_TYPE_EFI;

	si->lfb_width = width;
	si->lfb_height = height;
	si->lfb_base = fb_base;

	ext_lfb_base = (u64)(unsigned long)fb_base >> 32;
	if (ext_lfb_base) {
	si->capabilities \|= VIDEO_CAPABILITY_64BIT_BASE;
	si->ext_lfb_base = ext_lfb_base;
	}

	si->pages = 1;

	setup_pixel_info(si, pixels_per_scan_line, pixel_info, pixel_format);

	si->lfb_size = si->lfb_linelength * si->lfb_height;

	si->capabilities \|= VIDEO_CAPABILITY_SKIP_QUIRKS;
	out:
	return status;
	}

	/*
	* See if we have Graphics Output Protocol
	*/
	efi_status_t efi_setup_gop(efi_system_table_t *sys_table_arg,
	struct screen_info si, efi_guid_t proto,
	unsigned long size)
	{
	efi_status_t status;
	void **gop_handle = NULL;

	status = efi_call_early(allocate_pool, EFI_LOADER_DATA,
	size, (void **)&gop_handle);
	if (status != EFI_SUCCESS)
	return status;

	status = efi_call_early(locate_handle,
	EFI_LOCATE_BY_PROTOCOL,
	proto, NULL, &size, gop_handle);
	if (status != EFI_SUCCESS)
	goto free_handle;

	if (efi_is_64bit()) {
	status = setup_gop64(sys_table_arg, si, proto, size,
	gop_handle);
	} else {
	status = setup_gop32(sys_table_arg, si, proto, size,
	gop_handle);
	}

	free_handle:
	efi_call_early(free_pool, gop_handle);
	return status;
	}