A EFI applications usually want to access storage devices to load data from. This patch adds support for EFI disk interfaces. It loops through all block storage interfaces known to U-Boot and creates an EFI object for each existing one. EFI applications can then through these objects call U-Boot's read and write functions. Signed-off-by: Alexander Graf <agraf@suse.de> Reviewed-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org> [trini: Update for various DM changes since posting] Signed-off-by: Tom Rini <trini@konsulko.com>master
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/*
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* EFI application disk support |
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* |
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* Copyright (c) 2016 Alexander Graf |
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* |
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* SPDX-License-Identifier: GPL-2.0+ |
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*/ |
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#include <common.h> |
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#include <efi_loader.h> |
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#include <inttypes.h> |
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#include <part.h> |
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#include <malloc.h> |
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static const efi_guid_t efi_block_io_guid = BLOCK_IO_GUID; |
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struct efi_disk_obj { |
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/* Generic EFI object parent class data */ |
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struct efi_object parent; |
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/* EFI Interface callback struct for block I/O */ |
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struct efi_block_io ops; |
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/* U-Boot ifname for block device */ |
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const char *ifname; |
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/* U-Boot dev_index for block device */ |
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int dev_index; |
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/* EFI Interface Media descriptor struct, referenced by ops */ |
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struct efi_block_io_media media; |
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/* EFI device path to this block device */ |
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struct efi_device_path_file_path *dp; |
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}; |
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static void ascii2unicode(u16 *unicode, char *ascii) |
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{ |
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while (*ascii) |
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*(unicode++) = *(ascii++); |
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} |
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static efi_status_t efi_disk_open_block(void *handle, efi_guid_t *protocol, |
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void **protocol_interface, void *agent_handle, |
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void *controller_handle, uint32_t attributes) |
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{ |
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struct efi_disk_obj *diskobj = handle; |
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*protocol_interface = &diskobj->ops; |
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return EFI_SUCCESS; |
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} |
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static efi_status_t efi_disk_open_dp(void *handle, efi_guid_t *protocol, |
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void **protocol_interface, void *agent_handle, |
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void *controller_handle, uint32_t attributes) |
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{ |
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struct efi_disk_obj *diskobj = handle; |
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*protocol_interface = diskobj->dp; |
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return EFI_SUCCESS; |
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} |
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static efi_status_t EFIAPI efi_disk_reset(struct efi_block_io *this, |
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char extended_verification) |
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{ |
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EFI_ENTRY("%p, %x", this, extended_verification); |
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return EFI_EXIT(EFI_DEVICE_ERROR); |
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} |
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enum efi_disk_direction { |
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EFI_DISK_READ, |
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EFI_DISK_WRITE, |
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}; |
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static efi_status_t EFIAPI efi_disk_rw_blocks(struct efi_block_io *this, |
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u32 media_id, u64 lba, unsigned long buffer_size, |
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void *buffer, enum efi_disk_direction direction) |
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{ |
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struct efi_disk_obj *diskobj; |
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struct blk_desc *desc; |
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int blksz; |
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int blocks; |
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unsigned long n; |
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EFI_ENTRY("%p, %x, %"PRIx64", %lx, %p", this, media_id, lba, |
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buffer_size, buffer); |
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diskobj = container_of(this, struct efi_disk_obj, ops); |
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if (!(desc = blk_get_dev(diskobj->ifname, diskobj->dev_index))) |
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return EFI_EXIT(EFI_DEVICE_ERROR); |
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blksz = desc->blksz; |
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blocks = buffer_size / blksz; |
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#ifdef DEBUG_EFI |
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printf("EFI: %s:%d blocks=%x lba=%"PRIx64" blksz=%x dir=%d\n", __func__, |
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__LINE__, blocks, lba, blksz, direction); |
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#endif |
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/* We only support full block access */ |
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if (buffer_size & (blksz - 1)) |
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return EFI_EXIT(EFI_DEVICE_ERROR); |
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if (direction == EFI_DISK_READ) |
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n = desc->block_read(desc, lba, blocks, buffer); |
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else |
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n = desc->block_write(desc, lba, blocks, buffer); |
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/* We don't do interrupts, so check for timers cooperatively */ |
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efi_timer_check(); |
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#ifdef DEBUG_EFI |
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printf("EFI: %s:%d n=%lx blocks=%x\n", __func__, __LINE__, n, blocks); |
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#endif |
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if (n != blocks) |
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return EFI_EXIT(EFI_DEVICE_ERROR); |
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return EFI_EXIT(EFI_SUCCESS); |
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} |
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static efi_status_t efi_disk_read_blocks(struct efi_block_io *this, |
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u32 media_id, u64 lba, unsigned long buffer_size, |
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void *buffer) |
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{ |
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return efi_disk_rw_blocks(this, media_id, lba, buffer_size, buffer, |
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EFI_DISK_READ); |
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} |
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static efi_status_t efi_disk_write_blocks(struct efi_block_io *this, |
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u32 media_id, u64 lba, unsigned long buffer_size, |
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void *buffer) |
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{ |
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return efi_disk_rw_blocks(this, media_id, lba, buffer_size, buffer, |
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EFI_DISK_WRITE); |
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} |
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static efi_status_t EFIAPI efi_disk_flush_blocks(struct efi_block_io *this) |
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{ |
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/* We always write synchronously */ |
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EFI_ENTRY("%p", this); |
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return EFI_EXIT(EFI_SUCCESS); |
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} |
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static const struct efi_block_io block_io_disk_template = { |
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.reset = &efi_disk_reset, |
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.read_blocks = &efi_disk_read_blocks, |
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.write_blocks = &efi_disk_write_blocks, |
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.flush_blocks = &efi_disk_flush_blocks, |
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}; |
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/*
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* U-Boot doesn't have a list of all online disk devices. So when running our |
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* EFI payload, we scan through all of the potentially available ones and |
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* store them in our object pool. |
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* |
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* This gets called from do_bootefi_exec(). |
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*/ |
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int efi_disk_register(void) |
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{ |
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const struct block_drvr *cur_drvr; |
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int i; |
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int disks = 0; |
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/* Search for all available disk devices */ |
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for (cur_drvr = block_drvr; cur_drvr->name; cur_drvr++) { |
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printf("Scanning disks on %s...\n", cur_drvr->name); |
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for (i = 0; i < 4; i++) { |
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struct blk_desc *desc; |
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struct efi_disk_obj *diskobj; |
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struct efi_device_path_file_path *dp; |
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int objlen = sizeof(*diskobj) + (sizeof(*dp) * 2); |
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char devname[16] = { 0 }; /* dp->str is u16[16] long */ |
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desc = blk_get_dev(cur_drvr->name, i); |
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if (!desc) |
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continue; |
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if (desc->type == DEV_TYPE_UNKNOWN) |
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continue; |
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diskobj = calloc(1, objlen); |
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/* Fill in object data */ |
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diskobj->parent.protocols[0].guid = &efi_block_io_guid; |
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diskobj->parent.protocols[0].open = efi_disk_open_block; |
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diskobj->parent.protocols[1].guid = &efi_guid_device_path; |
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diskobj->parent.protocols[1].open = efi_disk_open_dp; |
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diskobj->parent.handle = diskobj; |
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diskobj->ops = block_io_disk_template; |
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diskobj->ifname = cur_drvr->name; |
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diskobj->dev_index = i; |
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/* Fill in EFI IO Media info (for read/write callbacks) */ |
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diskobj->media.removable_media = desc->removable; |
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diskobj->media.media_present = 1; |
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diskobj->media.block_size = desc->blksz; |
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diskobj->media.io_align = desc->blksz; |
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diskobj->media.last_block = desc->lba; |
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diskobj->ops.media = &diskobj->media; |
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/* Fill in device path */ |
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dp = (void*)&diskobj[1]; |
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diskobj->dp = dp; |
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dp[0].dp.type = DEVICE_PATH_TYPE_MEDIA_DEVICE; |
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dp[0].dp.sub_type = DEVICE_PATH_SUB_TYPE_FILE_PATH; |
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dp[0].dp.length = sizeof(*dp); |
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snprintf(devname, sizeof(devname), "%s%d", |
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cur_drvr->name, i); |
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ascii2unicode(dp[0].str, devname); |
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dp[1].dp.type = DEVICE_PATH_TYPE_END; |
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dp[1].dp.sub_type = DEVICE_PATH_SUB_TYPE_END; |
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dp[1].dp.length = sizeof(*dp); |
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/* Hook up to the device list */ |
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list_add_tail(&diskobj->parent.link, &efi_obj_list); |
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disks++; |
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} |
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} |
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printf("Found %d disks\n", disks); |
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return 0; |
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} |
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