lib/efi_loader/efi_disk.c - uboot-imx - Git at Google

 /*
  *  EFI application disk support
  *
  *  Copyright (c) 2016 Alexander Graf
  *
  *  SPDX-License-Identifier:     GPL-2.0+
  */

 #include <common.h>
 #include <blk.h>
 #include <dm.h>
 #include <efi_loader.h>
 #include <inttypes.h>
 #include <part.h>
 #include <malloc.h>

 static const efi_guid_t efi_block_io_guid = BLOCK_IO_GUID;

 struct efi_disk_obj {
 	/* Generic EFI object parent class data */
 	struct efi_object parent;
 	/* EFI Interface callback struct for block I/O */
 	struct efi_block_io ops;
 	/* U-Boot ifname for block device */
 	const char *ifname;
 	/* U-Boot dev_index for block device */
 	int dev_index;
 	/* EFI Interface Media descriptor struct, referenced by ops */
 	struct efi_block_io_media media;
 	/* EFI device path to this block device */
 	struct efi_device_path_file_path *dp;
 	/* Offset into disk for simple partitions */
 	lbaint_t offset;
 	/* Internal block device */
 	const struct blk_desc *desc;
 };

 static efi_status_t EFIAPI efi_disk_open_block(void *handle,
 			efi_guid_t *protocol, void **protocol_interface,
 			void *agent_handle, void *controller_handle,
 			uint32_t attributes)
 {
 	struct efi_disk_obj *diskobj = handle;

 	*protocol_interface = &diskobj->ops;

 	return EFI_SUCCESS;
 }

 static efi_status_t EFIAPI efi_disk_open_dp(void *handle, efi_guid_t *protocol,
 			void **protocol_interface, void *agent_handle,
 			void *controller_handle, uint32_t attributes)
 {
 	struct efi_disk_obj *diskobj = handle;

 	*protocol_interface = diskobj->dp;

 	return EFI_SUCCESS;
 }

 static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this,
 			char extended_verification)
 {
 	EFI_ENTRY("%p, %x", this, extended_verification);
 	return EFI_EXIT(EFI_DEVICE_ERROR);
 }

 enum efi_disk_direction {
 	EFI_DISK_READ,
 	EFI_DISK_WRITE,
 };

 static efi_status_t EFIAPI efi_disk_rw_blocks(struct efi_block_io *this,
 			u32 media_id, u64 lba, unsigned long buffer_size,
 			void *buffer, enum efi_disk_direction direction)
 {
 	struct efi_disk_obj *diskobj;
 	struct blk_desc *desc;
 	int blksz;
 	int blocks;
 	unsigned long n;

 	diskobj = container_of(this, struct efi_disk_obj, ops);
 	desc = (struct blk_desc *) diskobj->desc;
 	blksz = desc->blksz;
 	blocks = buffer_size / blksz;
 	lba += diskobj->offset;

 	debug("EFI: %s:%d blocks=%x lba=%"PRIx64" blksz=%x dir=%d\n", __func__,
 	      __LINE__, blocks, lba, blksz, direction);

 	/* We only support full block access */
 	if (buffer_size & (blksz - 1))
 		return EFI_EXIT(EFI_DEVICE_ERROR);

 	if (direction == EFI_DISK_READ)
 		n = blk_dread(desc, lba, blocks, buffer);
 	else
 		n = blk_dwrite(desc, lba, blocks, buffer);

 	/* We don't do interrupts, so check for timers cooperatively */
 	efi_timer_check();

 	debug("EFI: %s:%d n=%lx blocks=%x\n", __func__, __LINE__, n, blocks);

 	if (n != blocks)
 		return EFI_EXIT(EFI_DEVICE_ERROR);

 	return EFI_EXIT(EFI_SUCCESS);
 }

 static efi_status_t EFIAPI efi_disk_read_blocks(struct efi_block_io *this,
 			u32 media_id, u64 lba, unsigned long buffer_size,
 			void *buffer)
 {
 	void *real_buffer = buffer;
 	efi_status_t r;

 #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
 	if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
 		r = efi_disk_read_blocks(this, media_id, lba,
 			EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
 		if (r != EFI_SUCCESS)
 			return r;
 		return efi_disk_read_blocks(this, media_id, lba +
 			EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
 			buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
 			buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
 	}

 	real_buffer = efi_bounce_buffer;
 #endif

 	EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba,
 		  buffer_size, buffer);

 	r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
 			       EFI_DISK_READ);

 	/* Copy from bounce buffer to real buffer if necessary */
 	if ((r == EFI_SUCCESS) && (real_buffer != buffer))
 		memcpy(buffer, real_buffer, buffer_size);

 	return EFI_EXIT(r);
 }

 static efi_status_t EFIAPI efi_disk_write_blocks(struct efi_block_io *this,
 			u32 media_id, u64 lba, unsigned long buffer_size,
 			void *buffer)
 {
 	void *real_buffer = buffer;
 	efi_status_t r;

 #ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
 	if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
 		r = efi_disk_write_blocks(this, media_id, lba,
 			EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
 		if (r != EFI_SUCCESS)
 			return r;
 		return efi_disk_write_blocks(this, media_id, lba +
 			EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
 			buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
 			buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
 	}

 	real_buffer = efi_bounce_buffer;
 #endif

 	EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba,
 		  buffer_size, buffer);

 	/* Populate bounce buffer if necessary */
 	if (real_buffer != buffer)
 		memcpy(real_buffer, buffer, buffer_size);

 	r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
 			       EFI_DISK_WRITE);

 	return EFI_EXIT(r);
 }

 static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this)
 {
 	/* We always write synchronously */
 	EFI_ENTRY("%p", this);
 	return EFI_EXIT(EFI_SUCCESS);
 }

 static const struct efi_block_io block_io_disk_template = {
 	.reset = &efi_disk_reset,
 	.read_blocks = &efi_disk_read_blocks,
 	.write_blocks = &efi_disk_write_blocks,
 	.flush_blocks = &efi_disk_flush_blocks,
 };

 static void efi_disk_add_dev(const char *name,
 			     const char *if_typename,
 			     const struct blk_desc *desc,
 			     int dev_index,
 			     lbaint_t offset)
 {
 	struct efi_disk_obj *diskobj;
 	struct efi_device_path_file_path *dp;
 	int objlen = sizeof(*diskobj) + (sizeof(*dp) * 2);

 	/* Don't add empty devices */
 	if (!desc->lba)
 		return;

 	diskobj = calloc(1, objlen);

 	/* Fill in object data */
 	diskobj->parent.protocols[0].guid = &efi_block_io_guid;
 	diskobj->parent.protocols[0].open = efi_disk_open_block;
 	diskobj->parent.protocols[1].guid = &efi_guid_device_path;
 	diskobj->parent.protocols[1].open = efi_disk_open_dp;
 	diskobj->parent.handle = diskobj;
 	diskobj->ops = block_io_disk_template;
 	diskobj->ifname = if_typename;
 	diskobj->dev_index = dev_index;
 	diskobj->offset = offset;
 	diskobj->desc = desc;

 	/* Fill in EFI IO Media info (for read/write callbacks) */
 	diskobj->media.removable_media = desc->removable;
 	diskobj->media.media_present = 1;
 	diskobj->media.block_size = desc->blksz;
 	diskobj->media.io_align = desc->blksz;
 	diskobj->media.last_block = desc->lba - offset;
 	diskobj->ops.media = &diskobj->media;

 	/* Fill in device path */
 	dp = (void*)&diskobj[1];
 	diskobj->dp = dp;
 	dp[0].dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE;
 	dp[0].dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH;
 	dp[0].dp.length = sizeof(*dp);
 	ascii2unicode(dp[0].str, name);

 	dp[1].dp.type = DEVICE_PATH_TYPE_END;
 	dp[1].dp.sub_type = DEVICE_PATH_SUB_TYPE_END;
 	dp[1].dp.length = sizeof(*dp);

 	/* Hook up to the device list */
 	list_add_tail(&diskobj->parent.link, &efi_obj_list);
 }

 static int efi_disk_create_eltorito(struct blk_desc *desc,
 				    const char *if_typename,
 				    int diskid,
 				    const char *pdevname)
 {
 	int disks = 0;
 #if CONFIG_IS_ENABLED(ISO_PARTITION)
 	char devname[32] = { 0 }; /* dp->str is u16[32] long */
 	disk_partition_t info;
 	int part = 1;

 	if (desc->part_type != PART_TYPE_ISO)
 		return 0;

 	while (!part_get_info(desc, part, &info)) {
 		snprintf(devname, sizeof(devname), "%s:%d", pdevname,
 			 part);
 		efi_disk_add_dev(devname, if_typename, desc, diskid,
 				 info.start);
 		part++;
 		disks++;
 	}
 #endif

 	return disks;
 }

 /*
  * U-Boot doesn't have a list of all online disk devices. So when running our
  * EFI payload, we scan through all of the potentially available ones and
  * store them in our object pool.
  *
  * TODO(sjg@chromium.org): Actually with CONFIG_BLK, U-Boot does have this.
  * Consider converting the code to look up devices as needed. The EFI device
  * could be a child of the UCLASS_BLK block device, perhaps.
  *
  * This gets called from do_bootefi_exec().
  */
 int efi_disk_register(void)
 {
 	int disks = 0;
 #ifdef CONFIG_BLK
 	struct udevice *dev;

 	for (uclass_first_device(UCLASS_BLK, &dev);
 	     dev;
 	     uclass_next_device(&dev)) {
 		struct blk_desc *desc = dev_get_uclass_platdata(dev);
 		const char *if_typename = dev->driver->name;

 		printf("Scanning disk %s...\n", dev->name);
 		efi_disk_add_dev(dev->name, if_typename, desc, desc->devnum, 0);
 		disks++;

 		/*
 		* El Torito images show up as block devices in an EFI world,
 		* so let's create them here
 		*/
 		disks += efi_disk_create_eltorito(desc, if_typename,
 						  desc->devnum, dev->name);
 	}
 #else
 	int i, if_type;

 	/* Search for all available disk devices */
 	for (if_type = 0; if_type < IF_TYPE_COUNT; if_type++) {
 		const struct blk_driver *cur_drvr;
 		const char *if_typename;

 		cur_drvr = blk_driver_lookup_type(if_type);
 		if (!cur_drvr)
 			continue;

 		if_typename = cur_drvr->if_typename;
 		printf("Scanning disks on %s...\n", if_typename);
 		for (i = 0; i < 4; i++) {
 			struct blk_desc *desc;
 			char devname[32] = { 0 }; /* dp->str is u16[32] long */

 			desc = blk_get_devnum_by_type(if_type, i);
 			if (!desc)
 				continue;
 			if (desc->type == DEV_TYPE_UNKNOWN)
 				continue;

 			snprintf(devname, sizeof(devname), "%s%d",
 				 if_typename, i);
 			efi_disk_add_dev(devname, if_typename, desc, i, 0);
 			disks++;

 			/*
 			 * El Torito images show up as block devices
 			 * in an EFI world, so let's create them here
 			 */
 			disks += efi_disk_create_eltorito(desc, if_typename,
 							  i, devname);
 		}
 	}
 #endif
 	printf("Found %d disks\n", disks);

 	return 0;
 }
	/*
	* EFI application disk support
	*
	* Copyright (c) 2016 Alexander Graf
	*
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#include <common.h>
	#include <blk.h>
	#include <dm.h>
	#include <efi_loader.h>
	#include <inttypes.h>
	#include <part.h>
	#include <malloc.h>

	static const efi_guid_t efi_block_io_guid = BLOCK_IO_GUID;

	struct efi_disk_obj {
	/* Generic EFI object parent class data */
	struct efi_object parent;
	/* EFI Interface callback struct for block I/O */
	struct efi_block_io ops;
	/* U-Boot ifname for block device */
	const char *ifname;
	/* U-Boot dev_index for block device */
	int dev_index;
	/* EFI Interface Media descriptor struct, referenced by ops */
	struct efi_block_io_media media;
	/* EFI device path to this block device */
	struct efi_device_path_file_path *dp;
	/* Offset into disk for simple partitions */
	lbaint_t offset;
	/* Internal block device */
	const struct blk_desc *desc;
	};

	static efi_status_t EFIAPI efi_disk_open_block(void *handle,
	efi_guid_t protocol, void *protocol_interface,
	void agent_handle, void controller_handle,
	uint32_t attributes)
	{
	struct efi_disk_obj *diskobj = handle;

	*protocol_interface = &diskobj->ops;

	return EFI_SUCCESS;
	}

	static efi_status_t EFIAPI efi_disk_open_dp(void handle, efi_guid_t protocol,
	void *protocol_interface, void agent_handle,
	void *controller_handle, uint32_t attributes)
	{
	struct efi_disk_obj *diskobj = handle;

	*protocol_interface = diskobj->dp;

	return EFI_SUCCESS;
	}

	static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this,
	char extended_verification)
	{
	EFI_ENTRY("%p, %x", this, extended_verification);
	return EFI_EXIT(EFI_DEVICE_ERROR);
	}

	enum efi_disk_direction {
	EFI_DISK_READ,
	EFI_DISK_WRITE,
	};

	static efi_status_t EFIAPI efi_disk_rw_blocks(struct efi_block_io *this,
	u32 media_id, u64 lba, unsigned long buffer_size,
	void *buffer, enum efi_disk_direction direction)
	{
	struct efi_disk_obj *diskobj;
	struct blk_desc *desc;
	int blksz;
	int blocks;
	unsigned long n;

	diskobj = container_of(this, struct efi_disk_obj, ops);
	desc = (struct blk_desc *) diskobj->desc;
	blksz = desc->blksz;
	blocks = buffer_size / blksz;
	lba += diskobj->offset;

	debug("EFI: %s:%d blocks=%x lba=%"PRIx64" blksz=%x dir=%d\n", __func__,
	__LINE__, blocks, lba, blksz, direction);

	/* We only support full block access */
	if (buffer_size & (blksz - 1))
	return EFI_EXIT(EFI_DEVICE_ERROR);

	if (direction == EFI_DISK_READ)
	n = blk_dread(desc, lba, blocks, buffer);
	else
	n = blk_dwrite(desc, lba, blocks, buffer);

	/* We don't do interrupts, so check for timers cooperatively */
	efi_timer_check();

	debug("EFI: %s:%d n=%lx blocks=%x\n", __func__, __LINE__, n, blocks);

	if (n != blocks)
	return EFI_EXIT(EFI_DEVICE_ERROR);

	return EFI_EXIT(EFI_SUCCESS);
	}

	static efi_status_t EFIAPI efi_disk_read_blocks(struct efi_block_io *this,
	u32 media_id, u64 lba, unsigned long buffer_size,
	void *buffer)
	{
	void *real_buffer = buffer;
	efi_status_t r;

	#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
	if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
	r = efi_disk_read_blocks(this, media_id, lba,
	EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
	if (r != EFI_SUCCESS)
	return r;
	return efi_disk_read_blocks(this, media_id, lba +
	EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
	buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
	buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
	}

	real_buffer = efi_bounce_buffer;
	#endif

	EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba,
	buffer_size, buffer);

	r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
	EFI_DISK_READ);

	/* Copy from bounce buffer to real buffer if necessary */
	if ((r == EFI_SUCCESS) && (real_buffer != buffer))
	memcpy(buffer, real_buffer, buffer_size);

	return EFI_EXIT(r);
	}

	static efi_status_t EFIAPI efi_disk_write_blocks(struct efi_block_io *this,
	u32 media_id, u64 lba, unsigned long buffer_size,
	void *buffer)
	{
	void *real_buffer = buffer;
	efi_status_t r;

	#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
	if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
	r = efi_disk_write_blocks(this, media_id, lba,
	EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
	if (r != EFI_SUCCESS)
	return r;
	return efi_disk_write_blocks(this, media_id, lba +
	EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
	buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
	buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
	}

	real_buffer = efi_bounce_buffer;
	#endif

	EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba,
	buffer_size, buffer);

	/* Populate bounce buffer if necessary */
	if (real_buffer != buffer)
	memcpy(real_buffer, buffer, buffer_size);

	r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
	EFI_DISK_WRITE);

	return EFI_EXIT(r);
	}

	static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this)
	{
	/* We always write synchronously */
	EFI_ENTRY("%p", this);
	return EFI_EXIT(EFI_SUCCESS);
	}

	static const struct efi_block_io block_io_disk_template = {
	.reset = &efi_disk_reset,
	.read_blocks = &efi_disk_read_blocks,
	.write_blocks = &efi_disk_write_blocks,
	.flush_blocks = &efi_disk_flush_blocks,
	};

	static void efi_disk_add_dev(const char *name,
	const char *if_typename,
	const struct blk_desc *desc,
	int dev_index,
	lbaint_t offset)
	{
	struct efi_disk_obj *diskobj;
	struct efi_device_path_file_path *dp;
	int objlen = sizeof(diskobj) + (sizeof(dp) * 2);

	/* Don't add empty devices */
	if (!desc->lba)
	return;

	diskobj = calloc(1, objlen);

	/* Fill in object data */
	diskobj->parent.protocols[0].guid = &efi_block_io_guid;
	diskobj->parent.protocols[0].open = efi_disk_open_block;
	diskobj->parent.protocols[1].guid = &efi_guid_device_path;
	diskobj->parent.protocols[1].open = efi_disk_open_dp;
	diskobj->parent.handle = diskobj;
	diskobj->ops = block_io_disk_template;
	diskobj->ifname = if_typename;
	diskobj->dev_index = dev_index;
	diskobj->offset = offset;
	diskobj->desc = desc;

	/* Fill in EFI IO Media info (for read/write callbacks) */
	diskobj->media.removable_media = desc->removable;
	diskobj->media.media_present = 1;
	diskobj->media.block_size = desc->blksz;
	diskobj->media.io_align = desc->blksz;
	diskobj->media.last_block = desc->lba - offset;
	diskobj->ops.media = &diskobj->media;

	/* Fill in device path */
	dp = (void*)&diskobj[1];
	diskobj->dp = dp;
	dp[0].dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE;
	dp[0].dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH;
	dp[0].dp.length = sizeof(*dp);
	ascii2unicode(dp[0].str, name);

	dp[1].dp.type = DEVICE_PATH_TYPE_END;
	dp[1].dp.sub_type = DEVICE_PATH_SUB_TYPE_END;
	dp[1].dp.length = sizeof(*dp);

	/* Hook up to the device list */
	list_add_tail(&diskobj->parent.link, &efi_obj_list);
	}

	static int efi_disk_create_eltorito(struct blk_desc *desc,
	const char *if_typename,
	int diskid,
	const char *pdevname)
	{
	int disks = 0;
	#if CONFIG_IS_ENABLED(ISO_PARTITION)
	char devname[32] = { 0 }; /* dp->str is u16[32] long */
	disk_partition_t info;
	int part = 1;

	if (desc->part_type != PART_TYPE_ISO)
	return 0;

	while (!part_get_info(desc, part, &info)) {
	snprintf(devname, sizeof(devname), "%s:%d", pdevname,
	part);
	efi_disk_add_dev(devname, if_typename, desc, diskid,
	info.start);
	part++;
	disks++;
	}
	#endif

	return disks;
	}

	/*
	* U-Boot doesn't have a list of all online disk devices. So when running our
	* EFI payload, we scan through all of the potentially available ones and
	* store them in our object pool.
	*
	* TODO(sjg@chromium.org): Actually with CONFIG_BLK, U-Boot does have this.
	* Consider converting the code to look up devices as needed. The EFI device
	* could be a child of the UCLASS_BLK block device, perhaps.
	*
	* This gets called from do_bootefi_exec().
	*/
	int efi_disk_register(void)
	{
	int disks = 0;
	#ifdef CONFIG_BLK
	struct udevice *dev;

	for (uclass_first_device(UCLASS_BLK, &dev);
	dev;
	uclass_next_device(&dev)) {
	struct blk_desc *desc = dev_get_uclass_platdata(dev);
	const char *if_typename = dev->driver->name;

	printf("Scanning disk %s...\n", dev->name);
	efi_disk_add_dev(dev->name, if_typename, desc, desc->devnum, 0);
	disks++;

	/*
	* El Torito images show up as block devices in an EFI world,
	* so let's create them here
	*/
	disks += efi_disk_create_eltorito(desc, if_typename,
	desc->devnum, dev->name);
	}
	#else
	int i, if_type;

	/* Search for all available disk devices */
	for (if_type = 0; if_type < IF_TYPE_COUNT; if_type++) {
	const struct blk_driver *cur_drvr;
	const char *if_typename;

	cur_drvr = blk_driver_lookup_type(if_type);
	if (!cur_drvr)
	continue;

	if_typename = cur_drvr->if_typename;
	printf("Scanning disks on %s...\n", if_typename);
	for (i = 0; i < 4; i++) {
	struct blk_desc *desc;
	char devname[32] = { 0 }; /* dp->str is u16[32] long */

	desc = blk_get_devnum_by_type(if_type, i);
	if (!desc)
	continue;
	if (desc->type == DEV_TYPE_UNKNOWN)
	continue;

	snprintf(devname, sizeof(devname), "%s%d",
	if_typename, i);
	efi_disk_add_dev(devname, if_typename, desc, i, 0);
	disks++;

	/*
	* El Torito images show up as block devices
	* in an EFI world, so let's create them here
	*/
	disks += efi_disk_create_eltorito(desc, if_typename,
	i, devname);
	}
	}
	#endif
	printf("Found %d disks\n", disks);

	return 0;
	}