mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-15 06:33:45 +09:00
0f4060ebcb
EFI payloads can query for the device they were booted from. Because we have a disconnect between loading binaries and running binaries, we passed in a dummy device path so far. Unfortunately that breaks grub2's logic to find its configuration file from the same device it was booted from. This patch adds logic to have the "load" command call into our efi code to set the device path to the one we last loaded a binary from. With this grub2 properly detects where we got booted from and can find its configuration file, even when searching by-partition. Signed-off-by: Alexander Graf <agraf@suse.de>
213 lines
5.8 KiB
C
213 lines
5.8 KiB
C
/*
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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 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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