efi_loader: Add disk interfaces
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>
This commit is contained in:
Alexander Graf
Tom Rini
parent
50149ea37a
commit
2a22d05d33
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@ -87,6 +87,8 @@ struct efi_object {
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/* This list contains all UEFI objects we know of */
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extern struct list_head efi_obj_list;
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/* Called by bootefi to make all disk storage accessible as EFI objects */
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int efi_disk_register(void);
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/*
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* Stub implementation for a protocol opener that just returns the handle as
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* interface
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@ -0,0 +1,218 @@
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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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