aboutsummaryrefslogtreecommitdiffstats
path: root/roms/u-boot/lib/efi_loader/efi_disk.c
diff options
context:
space:
mode:
Diffstat (limited to 'roms/u-boot/lib/efi_loader/efi_disk.c')
-rw-r--r--roms/u-boot/lib/efi_loader/efi_disk.c666
1 files changed, 666 insertions, 0 deletions
diff --git a/roms/u-boot/lib/efi_loader/efi_disk.c b/roms/u-boot/lib/efi_loader/efi_disk.c
new file mode 100644
index 000000000..988907ecb
--- /dev/null
+++ b/roms/u-boot/lib/efi_loader/efi_disk.c
@@ -0,0 +1,666 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * EFI application disk support
+ *
+ * Copyright (c) 2016 Alexander Graf
+ */
+
+#define LOG_CATEGORY LOGC_EFI
+
+#include <common.h>
+#include <blk.h>
+#include <dm.h>
+#include <efi_loader.h>
+#include <fs.h>
+#include <log.h>
+#include <part.h>
+#include <malloc.h>
+
+struct efi_system_partition efi_system_partition;
+
+const efi_guid_t efi_block_io_guid = EFI_BLOCK_IO_PROTOCOL_GUID;
+const efi_guid_t efi_system_partition_guid = PARTITION_SYSTEM_GUID;
+
+/**
+ * struct efi_disk_obj - EFI disk object
+ *
+ * @header: EFI object header
+ * @ops: EFI disk I/O protocol interface
+ * @ifname: interface name for block device
+ * @dev_index: device index of block device
+ * @media: block I/O media information
+ * @dp: device path to the block device
+ * @part: partition
+ * @volume: simple file system protocol of the partition
+ * @offset: offset into disk for simple partition
+ * @desc: internal block device descriptor
+ */
+struct efi_disk_obj {
+ struct efi_object header;
+ struct efi_block_io ops;
+ const char *ifname;
+ int dev_index;
+ struct efi_block_io_media media;
+ struct efi_device_path *dp;
+ unsigned int part;
+ struct efi_simple_file_system_protocol *volume;
+ lbaint_t offset;
+ struct blk_desc *desc;
+};
+
+/**
+ * efi_disk_reset() - reset block device
+ *
+ * This function implements the Reset service of the EFI_BLOCK_IO_PROTOCOL.
+ *
+ * As U-Boot's block devices do not have a reset function simply return
+ * EFI_SUCCESS.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * @this: pointer to the BLOCK_IO_PROTOCOL
+ * @extended_verification: extended verification
+ * Return: status code
+ */
+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_SUCCESS);
+}
+
+enum efi_disk_direction {
+ EFI_DISK_READ,
+ EFI_DISK_WRITE,
+};
+
+static efi_status_t 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;
+
+ EFI_PRINT("blocks=%x lba=%llx blksz=%x dir=%d\n",
+ blocks, lba, blksz, direction);
+
+ /* We only support full block access */
+ if (buffer_size & (blksz - 1))
+ return EFI_BAD_BUFFER_SIZE;
+
+ 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();
+
+ EFI_PRINT("n=%lx blocks=%x\n", n, blocks);
+
+ if (n != blocks)
+ return EFI_DEVICE_ERROR;
+
+ return EFI_SUCCESS;
+}
+
+/**
+ * efi_disk_read_blocks() - reads blocks from device
+ *
+ * This function implements the ReadBlocks service of the EFI_BLOCK_IO_PROTOCOL.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * @this: pointer to the BLOCK_IO_PROTOCOL
+ * @media_id: id of the medium to be read from
+ * @lba: starting logical block for reading
+ * @buffer_size: size of the read buffer
+ * @buffer: pointer to the destination buffer
+ * Return: status code
+ */
+static efi_status_t EFIAPI efi_disk_read_blocks(struct efi_block_io *this,
+ u32 media_id, u64 lba, efi_uintn_t buffer_size,
+ void *buffer)
+{
+ void *real_buffer = buffer;
+ efi_status_t r;
+
+ if (!this)
+ return EFI_INVALID_PARAMETER;
+ /* TODO: check for media changes */
+ if (media_id != this->media->media_id)
+ return EFI_MEDIA_CHANGED;
+ if (!this->media->media_present)
+ return EFI_NO_MEDIA;
+ /* media->io_align is a power of 2 or 0 */
+ if (this->media->io_align &&
+ (uintptr_t)buffer & (this->media->io_align - 1))
+ return EFI_INVALID_PARAMETER;
+ if (lba * this->media->block_size + buffer_size >
+ (this->media->last_block + 1) * this->media->block_size)
+ return EFI_INVALID_PARAMETER;
+
+#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, %llx, %zx, %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);
+}
+
+/**
+ * efi_disk_write_blocks() - writes blocks to device
+ *
+ * This function implements the WriteBlocks service of the
+ * EFI_BLOCK_IO_PROTOCOL.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * @this: pointer to the BLOCK_IO_PROTOCOL
+ * @media_id: id of the medium to be written to
+ * @lba: starting logical block for writing
+ * @buffer_size: size of the write buffer
+ * @buffer: pointer to the source buffer
+ * Return: status code
+ */
+static efi_status_t EFIAPI efi_disk_write_blocks(struct efi_block_io *this,
+ u32 media_id, u64 lba, efi_uintn_t buffer_size,
+ void *buffer)
+{
+ void *real_buffer = buffer;
+ efi_status_t r;
+
+ if (!this)
+ return EFI_INVALID_PARAMETER;
+ if (this->media->read_only)
+ return EFI_WRITE_PROTECTED;
+ /* TODO: check for media changes */
+ if (media_id != this->media->media_id)
+ return EFI_MEDIA_CHANGED;
+ if (!this->media->media_present)
+ return EFI_NO_MEDIA;
+ /* media->io_align is a power of 2 or 0 */
+ if (this->media->io_align &&
+ (uintptr_t)buffer & (this->media->io_align - 1))
+ return EFI_INVALID_PARAMETER;
+ if (lba * this->media->block_size + buffer_size >
+ (this->media->last_block + 1) * this->media->block_size)
+ return EFI_INVALID_PARAMETER;
+
+#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, %llx, %zx, %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);
+}
+
+/**
+ * efi_disk_flush_blocks() - flushes modified data to the device
+ *
+ * This function implements the FlushBlocks service of the
+ * EFI_BLOCK_IO_PROTOCOL.
+ *
+ * As we always write synchronously nothing is done here.
+ *
+ * See the Unified Extensible Firmware Interface (UEFI) specification for
+ * details.
+ *
+ * @this: pointer to the BLOCK_IO_PROTOCOL
+ * Return: status code
+ */
+static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this)
+{
+ 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,
+};
+
+/**
+ * efi_fs_from_path() - retrieve simple file system protocol
+ *
+ * Gets the simple file system protocol for a file device path.
+ *
+ * The full path provided is split into device part and into a file
+ * part. The device part is used to find the handle on which the
+ * simple file system protocol is installed.
+ *
+ * @full_path: device path including device and file
+ * Return: simple file system protocol
+ */
+struct efi_simple_file_system_protocol *
+efi_fs_from_path(struct efi_device_path *full_path)
+{
+ struct efi_object *efiobj;
+ struct efi_handler *handler;
+ struct efi_device_path *device_path;
+ struct efi_device_path *file_path;
+ efi_status_t ret;
+
+ /* Split the path into a device part and a file part */
+ ret = efi_dp_split_file_path(full_path, &device_path, &file_path);
+ if (ret != EFI_SUCCESS)
+ return NULL;
+ efi_free_pool(file_path);
+
+ /* Get the EFI object for the partition */
+ efiobj = efi_dp_find_obj(device_path, NULL);
+ efi_free_pool(device_path);
+ if (!efiobj)
+ return NULL;
+
+ /* Find the simple file system protocol */
+ ret = efi_search_protocol(efiobj, &efi_simple_file_system_protocol_guid,
+ &handler);
+ if (ret != EFI_SUCCESS)
+ return NULL;
+
+ /* Return the simple file system protocol for the partition */
+ return handler->protocol_interface;
+}
+
+/**
+ * efi_fs_exists() - check if a partition bears a file system
+ *
+ * @desc: block device descriptor
+ * @part: partition number
+ * Return: 1 if a file system exists on the partition
+ * 0 otherwise
+ */
+static int efi_fs_exists(struct blk_desc *desc, int part)
+{
+ if (fs_set_blk_dev_with_part(desc, part))
+ return 0;
+
+ if (fs_get_type() == FS_TYPE_ANY)
+ return 0;
+
+ fs_close();
+
+ return 1;
+}
+
+/**
+ * efi_disk_add_dev() - create a handle for a partition or disk
+ *
+ * @parent: parent handle
+ * @dp_parent: parent device path
+ * @if_typename: interface name for block device
+ * @desc: internal block device
+ * @dev_index: device index for block device
+ * @part_info: partition info
+ * @part: partition
+ * @disk: pointer to receive the created handle
+ * Return: disk object
+ */
+static efi_status_t efi_disk_add_dev(
+ efi_handle_t parent,
+ struct efi_device_path *dp_parent,
+ const char *if_typename,
+ struct blk_desc *desc,
+ int dev_index,
+ struct disk_partition *part_info,
+ unsigned int part,
+ struct efi_disk_obj **disk)
+{
+ struct efi_disk_obj *diskobj;
+ struct efi_object *handle;
+ const efi_guid_t *guid = NULL;
+ efi_status_t ret;
+
+ /* Don't add empty devices */
+ if (!desc->lba)
+ return EFI_NOT_READY;
+
+ diskobj = calloc(1, sizeof(*diskobj));
+ if (!diskobj)
+ return EFI_OUT_OF_RESOURCES;
+
+ /* Hook up to the device list */
+ efi_add_handle(&diskobj->header);
+
+ /* Fill in object data */
+ if (part_info) {
+ struct efi_device_path *node = efi_dp_part_node(desc, part);
+ struct efi_handler *handler;
+ void *protocol_interface;
+
+ /* Parent must expose EFI_BLOCK_IO_PROTOCOL */
+ ret = efi_search_protocol(parent, &efi_block_io_guid, &handler);
+ if (ret != EFI_SUCCESS)
+ goto error;
+
+ /*
+ * Link the partition (child controller) to the block device
+ * (controller).
+ */
+ ret = efi_protocol_open(handler, &protocol_interface, NULL,
+ &diskobj->header,
+ EFI_OPEN_PROTOCOL_BY_CHILD_CONTROLLER);
+ if (ret != EFI_SUCCESS)
+ goto error;
+
+ diskobj->dp = efi_dp_append_node(dp_parent, node);
+ efi_free_pool(node);
+ diskobj->offset = part_info->start;
+ diskobj->media.last_block = part_info->size - 1;
+ if (part_info->bootable & PART_EFI_SYSTEM_PARTITION)
+ guid = &efi_system_partition_guid;
+ } else {
+ diskobj->dp = efi_dp_from_part(desc, part);
+ diskobj->offset = 0;
+ diskobj->media.last_block = desc->lba - 1;
+ }
+ diskobj->part = part;
+
+ /*
+ * Install the device path and the block IO protocol.
+ *
+ * InstallMultipleProtocolInterfaces() checks if the device path is
+ * already installed on an other handle and returns EFI_ALREADY_STARTED
+ * in this case.
+ */
+ handle = &diskobj->header;
+ ret = EFI_CALL(efi_install_multiple_protocol_interfaces(
+ &handle, &efi_guid_device_path, diskobj->dp,
+ &efi_block_io_guid, &diskobj->ops,
+ guid, NULL, NULL));
+ if (ret != EFI_SUCCESS)
+ return ret;
+
+ /*
+ * On partitions or whole disks without partitions install the
+ * simple file system protocol if a file system is available.
+ */
+ if ((part || desc->part_type == PART_TYPE_UNKNOWN) &&
+ efi_fs_exists(desc, part)) {
+ diskobj->volume = efi_simple_file_system(desc, part,
+ diskobj->dp);
+ ret = efi_add_protocol(&diskobj->header,
+ &efi_simple_file_system_protocol_guid,
+ diskobj->volume);
+ if (ret != EFI_SUCCESS)
+ return ret;
+ }
+ diskobj->ops = block_io_disk_template;
+ diskobj->ifname = if_typename;
+ diskobj->dev_index = dev_index;
+ diskobj->desc = desc;
+
+ /* Fill in EFI IO Media info (for read/write callbacks) */
+ diskobj->media.removable_media = desc->removable;
+ diskobj->media.media_present = 1;
+ /*
+ * MediaID is just an arbitrary counter.
+ * We have to change it if the medium is removed or changed.
+ */
+ diskobj->media.media_id = 1;
+ diskobj->media.block_size = desc->blksz;
+ diskobj->media.io_align = desc->blksz;
+ if (part)
+ diskobj->media.logical_partition = 1;
+ diskobj->ops.media = &diskobj->media;
+ if (disk)
+ *disk = diskobj;
+
+ EFI_PRINT("BlockIO: part %u, present %d, logical %d, removable %d"
+ ", offset " LBAF ", last_block %llu\n",
+ diskobj->part,
+ diskobj->media.media_present,
+ diskobj->media.logical_partition,
+ diskobj->media.removable_media,
+ diskobj->offset,
+ diskobj->media.last_block);
+
+ /* Store first EFI system partition */
+ if (part && !efi_system_partition.if_type) {
+ if (part_info->bootable & PART_EFI_SYSTEM_PARTITION) {
+ efi_system_partition.if_type = desc->if_type;
+ efi_system_partition.devnum = desc->devnum;
+ efi_system_partition.part = part;
+ EFI_PRINT("EFI system partition: %s %x:%x\n",
+ blk_get_if_type_name(desc->if_type),
+ desc->devnum, part);
+ }
+ }
+ return EFI_SUCCESS;
+error:
+ efi_delete_handle(&diskobj->header);
+ return ret;
+}
+
+/**
+ * efi_disk_create_partitions() - create handles and protocols for partitions
+ *
+ * Create handles and protocols for the partitions of a block device.
+ *
+ * @parent: handle of the parent disk
+ * @desc: block device
+ * @if_typename: interface type
+ * @diskid: device number
+ * @pdevname: device name
+ * Return: number of partitions created
+ */
+int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
+ const char *if_typename, int diskid,
+ const char *pdevname)
+{
+ int disks = 0;
+ char devname[32] = { 0 }; /* dp->str is u16[32] long */
+ int part;
+ struct efi_device_path *dp = NULL;
+ efi_status_t ret;
+ struct efi_handler *handler;
+
+ /* Get the device path of the parent */
+ ret = efi_search_protocol(parent, &efi_guid_device_path, &handler);
+ if (ret == EFI_SUCCESS)
+ dp = handler->protocol_interface;
+
+ /* Add devices for each partition */
+ for (part = 1; part <= MAX_SEARCH_PARTITIONS; part++) {
+ struct disk_partition info;
+
+ if (part_get_info(desc, part, &info))
+ continue;
+ snprintf(devname, sizeof(devname), "%s:%x", pdevname,
+ part);
+ ret = efi_disk_add_dev(parent, dp, if_typename, desc, diskid,
+ &info, part, NULL);
+ if (ret != EFI_SUCCESS) {
+ log_err("Adding partition %s failed\n", pdevname);
+ continue;
+ }
+ disks++;
+ }
+
+ return disks;
+}
+
+/**
+ * efi_disk_register() - register block devices
+ *
+ * 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.
+ *
+ * This function is called in efi_init_obj_list().
+ *
+ * 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.
+ *
+ * Return: status code
+ */
+efi_status_t efi_disk_register(void)
+{
+ struct efi_disk_obj *disk;
+ int disks = 0;
+ efi_status_t ret;
+#ifdef CONFIG_BLK
+ struct udevice *dev;
+
+ for (uclass_first_device_check(UCLASS_BLK, &dev); dev;
+ uclass_next_device_check(&dev)) {
+ struct blk_desc *desc = dev_get_uclass_plat(dev);
+ const char *if_typename = blk_get_if_type_name(desc->if_type);
+
+ /* Add block device for the full device */
+ log_info("Scanning disk %s...\n", dev->name);
+ ret = efi_disk_add_dev(NULL, NULL, if_typename,
+ desc, desc->devnum, NULL, 0, &disk);
+ if (ret == EFI_NOT_READY) {
+ log_notice("Disk %s not ready\n", dev->name);
+ continue;
+ }
+ if (ret) {
+ log_err("ERROR: failure to add disk device %s, r = %lu\n",
+ dev->name, ret & ~EFI_ERROR_MASK);
+ return ret;
+ }
+ disks++;
+
+ /* Partitions show up as block devices in EFI */
+ disks += efi_disk_create_partitions(
+ &disk->header, 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;
+ log_info("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);
+
+ /* Add block device for the full device */
+ ret = efi_disk_add_dev(NULL, NULL, if_typename, desc,
+ i, NULL, 0, &disk);
+ if (ret == EFI_NOT_READY) {
+ log_notice("Disk %s not ready\n", devname);
+ continue;
+ }
+ if (ret) {
+ log_err("ERROR: failure to add disk device %s, r = %lu\n",
+ devname, ret & ~EFI_ERROR_MASK);
+ return ret;
+ }
+ disks++;
+
+ /* Partitions show up as block devices in EFI */
+ disks += efi_disk_create_partitions
+ (&disk->header, desc,
+ if_typename, i, devname);
+ }
+ }
+#endif
+ log_info("Found %d disks\n", disks);
+
+ return EFI_SUCCESS;
+}
+
+/**
+ * efi_disk_is_system_part() - check if handle refers to an EFI system partition
+ *
+ * @handle: handle of partition
+ *
+ * Return: true if handle refers to an EFI system partition
+ */
+bool efi_disk_is_system_part(efi_handle_t handle)
+{
+ struct efi_handler *handler;
+ struct efi_disk_obj *diskobj;
+ struct disk_partition info;
+ efi_status_t ret;
+ int r;
+
+ /* check if this is a block device */
+ ret = efi_search_protocol(handle, &efi_block_io_guid, &handler);
+ if (ret != EFI_SUCCESS)
+ return false;
+
+ diskobj = container_of(handle, struct efi_disk_obj, header);
+
+ r = part_get_info(diskobj->desc, diskobj->part, &info);
+ if (r)
+ return false;
+
+ return !!(info.bootable & PART_EFI_SYSTEM_PARTITION);
+}