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https://github.com/brain-hackers/u-boot-brain
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![Heinrich Schuchardt](/assets/img/avatar_default.png)
We should consistently use the same name for protocol GUIDs as defined in the UEFI specification. Not adhering to this rule has led to duplicate definitions for the EFI_LOADED_IMAGE_PROTOCOL_GUID. Adjust misnamed protocol GUIDs. Adjust the text for the graphics output protocol in the output of the `efidebug dh` command. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
443 lines
12 KiB
C
443 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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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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#include <common.h>
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#include <blk.h>
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#include <dm.h>
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#include <efi_loader.h>
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#include <part.h>
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#include <malloc.h>
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const efi_guid_t efi_block_io_guid = EFI_BLOCK_IO_PROTOCOL_GUID;
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/**
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* struct efi_disk_obj - EFI disk object
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*
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* @header: EFI object header
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* @ops: EFI disk I/O protocol interface
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* @ifname: interface name for block device
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* @dev_index: device index of block device
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* @media: block I/O media information
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* @dp: device path to the block device
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* @part: partition
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* @volume: simple file system protocol of the partition
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* @offset: offset into disk for simple partition
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* @desc: internal block device descriptor
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*/
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struct efi_disk_obj {
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struct efi_object header;
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struct efi_block_io ops;
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const char *ifname;
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int dev_index;
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struct efi_block_io_media media;
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struct efi_device_path *dp;
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unsigned int part;
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struct efi_simple_file_system_protocol *volume;
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lbaint_t offset;
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struct blk_desc *desc;
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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 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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diskobj = container_of(this, struct efi_disk_obj, ops);
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desc = (struct blk_desc *) diskobj->desc;
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blksz = desc->blksz;
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blocks = buffer_size / blksz;
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lba += diskobj->offset;
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debug("EFI: %s:%d blocks=%x lba=%llx blksz=%x dir=%d\n", __func__,
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__LINE__, blocks, lba, blksz, direction);
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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_DEVICE_ERROR;
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if (direction == EFI_DISK_READ)
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n = blk_dread(desc, lba, blocks, buffer);
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else
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n = blk_dwrite(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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debug("EFI: %s:%d n=%lx blocks=%x\n", __func__, __LINE__, n, blocks);
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if (n != blocks)
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return EFI_DEVICE_ERROR;
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return EFI_SUCCESS;
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}
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static efi_status_t EFIAPI efi_disk_read_blocks(struct efi_block_io *this,
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u32 media_id, u64 lba, efi_uintn_t buffer_size,
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void *buffer)
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{
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void *real_buffer = buffer;
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efi_status_t r;
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#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
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if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
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r = efi_disk_read_blocks(this, media_id, lba,
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EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
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if (r != EFI_SUCCESS)
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return r;
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return efi_disk_read_blocks(this, media_id, lba +
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EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
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buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
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buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
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}
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real_buffer = efi_bounce_buffer;
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#endif
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EFI_ENTRY("%p, %x, %llx, %zx, %p", this, media_id, lba,
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buffer_size, buffer);
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r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
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EFI_DISK_READ);
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/* Copy from bounce buffer to real buffer if necessary */
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if ((r == EFI_SUCCESS) && (real_buffer != buffer))
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memcpy(buffer, real_buffer, buffer_size);
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return EFI_EXIT(r);
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}
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static efi_status_t EFIAPI efi_disk_write_blocks(struct efi_block_io *this,
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u32 media_id, u64 lba, efi_uintn_t buffer_size,
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void *buffer)
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{
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void *real_buffer = buffer;
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efi_status_t r;
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#ifdef CONFIG_EFI_LOADER_BOUNCE_BUFFER
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if (buffer_size > EFI_LOADER_BOUNCE_BUFFER_SIZE) {
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r = efi_disk_write_blocks(this, media_id, lba,
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EFI_LOADER_BOUNCE_BUFFER_SIZE, buffer);
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if (r != EFI_SUCCESS)
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return r;
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return efi_disk_write_blocks(this, media_id, lba +
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EFI_LOADER_BOUNCE_BUFFER_SIZE / this->media->block_size,
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buffer_size - EFI_LOADER_BOUNCE_BUFFER_SIZE,
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buffer + EFI_LOADER_BOUNCE_BUFFER_SIZE);
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}
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real_buffer = efi_bounce_buffer;
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#endif
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EFI_ENTRY("%p, %x, %llx, %zx, %p", this, media_id, lba,
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buffer_size, buffer);
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/* Populate bounce buffer if necessary */
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if (real_buffer != buffer)
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memcpy(real_buffer, buffer, buffer_size);
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r = efi_disk_rw_blocks(this, media_id, lba, buffer_size, real_buffer,
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EFI_DISK_WRITE);
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return EFI_EXIT(r);
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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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* Get the simple file system protocol for a file device path.
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*
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* The full path provided is split into device part and into a file
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* part. The device part is used to find the handle on which the
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* simple file system protocol is installed.
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*
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* @full_path device path including device and file
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* @return simple file system protocol
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*/
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struct efi_simple_file_system_protocol *
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efi_fs_from_path(struct efi_device_path *full_path)
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{
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struct efi_object *efiobj;
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struct efi_handler *handler;
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struct efi_device_path *device_path;
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struct efi_device_path *file_path;
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efi_status_t ret;
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/* Split the path into a device part and a file part */
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ret = efi_dp_split_file_path(full_path, &device_path, &file_path);
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if (ret != EFI_SUCCESS)
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return NULL;
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efi_free_pool(file_path);
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/* Get the EFI object for the partition */
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efiobj = efi_dp_find_obj(device_path, NULL);
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efi_free_pool(device_path);
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if (!efiobj)
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return NULL;
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/* Find the simple file system protocol */
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ret = efi_search_protocol(efiobj, &efi_simple_file_system_protocol_guid,
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&handler);
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if (ret != EFI_SUCCESS)
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return NULL;
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/* Return the simple file system protocol for the partition */
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return handler->protocol_interface;
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}
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/*
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* Create a handle for a partition or disk
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*
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* @parent parent handle
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* @dp_parent parent device path
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* @if_typename interface name for block device
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* @desc internal block device
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* @dev_index device index for block device
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* @offset offset into disk for simple partitions
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* @return disk object
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*/
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static efi_status_t efi_disk_add_dev(
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efi_handle_t parent,
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struct efi_device_path *dp_parent,
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const char *if_typename,
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struct blk_desc *desc,
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int dev_index,
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lbaint_t offset,
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unsigned int part,
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struct efi_disk_obj **disk)
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{
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struct efi_disk_obj *diskobj;
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efi_status_t ret;
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/* Don't add empty devices */
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if (!desc->lba)
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return EFI_NOT_READY;
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diskobj = calloc(1, sizeof(*diskobj));
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if (!diskobj)
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return EFI_OUT_OF_RESOURCES;
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/* Hook up to the device list */
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efi_add_handle(&diskobj->header);
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/* Fill in object data */
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if (part) {
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struct efi_device_path *node = efi_dp_part_node(desc, part);
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diskobj->dp = efi_dp_append_node(dp_parent, node);
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efi_free_pool(node);
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} else {
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diskobj->dp = efi_dp_from_part(desc, part);
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}
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diskobj->part = part;
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ret = efi_add_protocol(&diskobj->header, &efi_block_io_guid,
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&diskobj->ops);
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if (ret != EFI_SUCCESS)
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return ret;
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ret = efi_add_protocol(&diskobj->header, &efi_guid_device_path,
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diskobj->dp);
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if (ret != EFI_SUCCESS)
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return ret;
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if (part >= 1) {
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diskobj->volume = efi_simple_file_system(desc, part,
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diskobj->dp);
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ret = efi_add_protocol(&diskobj->header,
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&efi_simple_file_system_protocol_guid,
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diskobj->volume);
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if (ret != EFI_SUCCESS)
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return ret;
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}
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diskobj->ops = block_io_disk_template;
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diskobj->ifname = if_typename;
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diskobj->dev_index = dev_index;
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diskobj->offset = offset;
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diskobj->desc = desc;
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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 - offset;
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if (part != 0)
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diskobj->media.logical_partition = 1;
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diskobj->ops.media = &diskobj->media;
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if (disk)
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*disk = diskobj;
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return EFI_SUCCESS;
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}
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/*
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* Create handles and protocols for the partitions of a block device
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*
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* @parent handle of the parent disk
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* @blk_desc block device
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* @if_typename interface type
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* @diskid device number
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* @pdevname device name
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* @return number of partitions created
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*/
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int efi_disk_create_partitions(efi_handle_t parent, struct blk_desc *desc,
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const char *if_typename, int diskid,
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const char *pdevname)
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{
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int disks = 0;
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char devname[32] = { 0 }; /* dp->str is u16[32] long */
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disk_partition_t info;
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int part;
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struct efi_device_path *dp = NULL;
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efi_status_t ret;
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struct efi_handler *handler;
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/* Get the device path of the parent */
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ret = efi_search_protocol(parent, &efi_guid_device_path, &handler);
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if (ret == EFI_SUCCESS)
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dp = handler->protocol_interface;
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/* Add devices for each partition */
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for (part = 1; part <= MAX_SEARCH_PARTITIONS; part++) {
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if (part_get_info(desc, part, &info))
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continue;
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snprintf(devname, sizeof(devname), "%s:%d", pdevname,
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part);
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ret = efi_disk_add_dev(parent, dp, if_typename, desc, diskid,
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info.start, part, NULL);
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if (ret != EFI_SUCCESS) {
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printf("Adding partition %s failed\n", pdevname);
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continue;
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}
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disks++;
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}
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return disks;
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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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* TODO(sjg@chromium.org): Actually with CONFIG_BLK, U-Boot does have this.
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* Consider converting the code to look up devices as needed. The EFI device
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* could be a child of the UCLASS_BLK block device, perhaps.
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*
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* This gets called from do_bootefi_exec().
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*/
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efi_status_t efi_disk_register(void)
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{
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struct efi_disk_obj *disk;
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int disks = 0;
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efi_status_t ret;
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#ifdef CONFIG_BLK
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struct udevice *dev;
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for (uclass_first_device_check(UCLASS_BLK, &dev); dev;
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uclass_next_device_check(&dev)) {
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struct blk_desc *desc = dev_get_uclass_platdata(dev);
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const char *if_typename = blk_get_if_type_name(desc->if_type);
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/* Add block device for the full device */
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printf("Scanning disk %s...\n", dev->name);
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ret = efi_disk_add_dev(NULL, NULL, if_typename,
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desc, desc->devnum, 0, 0, &disk);
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if (ret == EFI_NOT_READY) {
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printf("Disk %s not ready\n", dev->name);
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continue;
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}
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if (ret) {
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printf("ERROR: failure to add disk device %s, r = %lu\n",
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dev->name, ret & ~EFI_ERROR_MASK);
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return ret;
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}
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disks++;
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/* Partitions show up as block devices in EFI */
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disks += efi_disk_create_partitions(
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&disk->header, desc, if_typename,
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desc->devnum, dev->name);
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}
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#else
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int i, if_type;
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/* Search for all available disk devices */
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for (if_type = 0; if_type < IF_TYPE_COUNT; if_type++) {
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const struct blk_driver *cur_drvr;
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const char *if_typename;
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cur_drvr = blk_driver_lookup_type(if_type);
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if (!cur_drvr)
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continue;
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if_typename = cur_drvr->if_typename;
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printf("Scanning disks on %s...\n", if_typename);
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for (i = 0; i < 4; i++) {
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struct blk_desc *desc;
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char devname[32] = { 0 }; /* dp->str is u16[32] long */
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desc = blk_get_devnum_by_type(if_type, 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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snprintf(devname, sizeof(devname), "%s%d",
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if_typename, i);
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/* Add block device for the full device */
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ret = efi_disk_add_dev(NULL, NULL, if_typename, desc,
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i, 0, 0, &disk);
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if (ret == EFI_NOT_READY) {
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printf("Disk %s not ready\n", devname);
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continue;
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}
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if (ret) {
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printf("ERROR: failure to add disk device %s, r = %lu\n",
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devname, ret & ~EFI_ERROR_MASK);
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return ret;
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}
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disks++;
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/* Partitions show up as block devices in EFI */
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disks += efi_disk_create_partitions
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(&disk->header, desc,
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if_typename, i, devname);
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}
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}
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#endif
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printf("Found %d disks\n", disks);
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return EFI_SUCCESS;
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}
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