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Allow a slice of an existing block device to be mapped to a blkmap. This means that filesystems that are not stored at exact partition boundaries can be accessed by remapping a slice of the existing device to a blkmap device. Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com> Reviewed-by: Simon Glass <sjg@chromium.org>
78 lines
2.3 KiB
C
78 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2023 Addiva Elektronik
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* Author: Tobias Waldekranz <tobias@waldekranz.com>
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*/
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#ifndef _BLKMAP_H
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#define _BLKMAP_H
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/**
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* blkmap_map_linear() - Map region of other block device
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*
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* @dev: Blkmap to create the mapping on
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* @blknr: Start block number of the mapping
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* @blkcnt: Number of blocks to map
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* @lblk: The target block device of the mapping
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* @lblknr: The start block number of the target device
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* Returns: 0 on success, negative error code on failure
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*/
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int blkmap_map_linear(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
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struct udevice *lblk, lbaint_t lblknr);
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/**
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* blkmap_map_mem() - Map region of memory
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*
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* @dev: Blkmap to create the mapping on
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* @blknr: Start block number of the mapping
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* @blkcnt: Number of blocks to map
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* @addr: The target memory address of the mapping
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* Returns: 0 on success, negative error code on failure
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*/
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int blkmap_map_mem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
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void *addr);
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/**
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* blkmap_map_pmem() - Map region of physical memory
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*
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* Ensures that a valid physical to virtual memory mapping for the
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* requested region is valid for the lifetime of the mapping, on
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* architectures that require it (sandbox).
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*
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* @dev: Blkmap to create the mapping on
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* @blknr: Start block number of the mapping
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* @blkcnt: Number of blocks to map
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* @paddr: The target physical memory address of the mapping
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* Returns: 0 on success, negative error code on failure
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*/
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int blkmap_map_pmem(struct udevice *dev, lbaint_t blknr, lbaint_t blkcnt,
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phys_addr_t paddr);
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/**
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* blkmap_from_label() - Find blkmap from label
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*
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* @label: Label of the requested blkmap
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* Returns: A pointer to the blkmap on success, NULL on failure
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*/
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struct udevice *blkmap_from_label(const char *label);
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/**
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* blkmap_create() - Create new blkmap
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*
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* @label: Label of the new blkmap
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* @devp: If not NULL, updated with the address of the resulting device
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* Returns: 0 on success, negative error code on failure
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*/
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int blkmap_create(const char *label, struct udevice **devp);
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/**
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* blkmap_destroy() - Destroy blkmap
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*
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* @dev: The blkmap to be destroyed
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* Returns: 0 on success, negative error code on failure
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*/
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int blkmap_destroy(struct udevice *dev);
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#endif /* _BLKMAP_H */
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