831405f41d
Some bootmeths support scanning a partition without a filesystem on it. Add a flag to support this. This will allow the ChromiumOS bootmeth to find kernel partition, which are stored in a special format, without a filesystem. Signed-off-by: Simon Glass <sjg@chromium.org>
384 lines
13 KiB
C
384 lines
13 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright 2021 Google LLC
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* Written by Simon Glass <sjg@chromium.org>
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*/
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#ifndef __bootmeth_h
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#define __bootmeth_h
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struct blk_desc;
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struct bootflow;
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struct bootflow_iter;
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struct udevice;
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/**
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* enum bootmeth_flags - Flags for bootmeths
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*
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* @BOOTMETHF_GLOBAL: bootmeth handles bootdev selection automatically
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* @BOOTMETHF_ANY_PART: bootmeth is willing to check any partition, even if it
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* has no filesystem
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*/
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enum bootmeth_flags {
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BOOTMETHF_GLOBAL = BIT(0),
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BOOTMETHF_ANY_PART = BIT(1),
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};
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/**
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* struct bootmeth_uc_plat - information the uclass keeps about each bootmeth
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*
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* @desc: A long description of the bootmeth
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* @flags: Flags for this bootmeth (enum bootmeth_flags)
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*/
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struct bootmeth_uc_plat {
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const char *desc;
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int flags;
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};
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/** struct bootmeth_ops - Operations for boot methods */
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struct bootmeth_ops {
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/**
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* get_state_desc() - get detailed state information
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*
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* Prodecues a textual description of the state of the bootmeth. This
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* can include newline characters if it extends to multiple lines. It
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* must be a nul-terminated string.
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*
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* This may involve reading state from the system, e.g. some data in
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* the firmware area.
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*
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* @dev: Bootmethod device to check
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* @buf: Buffer to place the info in (terminator must fit)
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* @maxsize: Size of buffer
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* Returns: 0 if OK, -ENOSPC is buffer is too small, other -ve error if
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* something else went wrong
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*/
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int (*get_state_desc)(struct udevice *dev, char *buf, int maxsize);
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/**
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* check_supported() - check if a bootmeth supports this bootdev
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*
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* This is optional. If not provided, the bootdev is assumed to be
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* supported
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*
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* The bootmeth can check the bootdev (e.g. to make sure it is a
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* network device) or the partition information. The following fields
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* in @iter are available:
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*
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* name, dev, state, part
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* max_part may be set if part != 0 (i.e. there is a valid partition
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* table). Otherwise max_part is 0
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* method is available but is the same as @dev
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* the partition has not yet been read, nor has the filesystem been
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* checked
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*
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* It may update only the flags in @iter
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*
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* @dev: Bootmethod device to check against
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* @iter: On entry, provides bootdev, hwpart, part
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* Return: 0 if OK, -ENOTSUPP if this bootdev is not supported
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*/
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int (*check)(struct udevice *dev, struct bootflow_iter *iter);
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/**
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* read_bootflow() - read a bootflow for a device
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*
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* @dev: Bootmethod device to use
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* @bflow: On entry, provides dev, hwpart, part and method.
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* Returns updated bootflow if found
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* Return: 0 if OK, -ve on error
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*/
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int (*read_bootflow)(struct udevice *dev, struct bootflow *bflow);
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/**
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* set_bootflow() - set the bootflow for a device
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*
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* This provides a bootflow file to the bootmeth, to see if it is valid.
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* If it is, the bootflow is set up accordingly.
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*
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* @dev: Bootmethod device to use
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* @bflow: On entry, provides bootdev.
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* Returns updated bootflow if found
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* @buf: Buffer containing the possible bootflow file
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* @size: Size of file
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* Return: 0 if OK, -ve on error
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*/
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int (*set_bootflow)(struct udevice *dev, struct bootflow *bflow,
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char *buf, int size);
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/**
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* read_file() - read a file needed for a bootflow
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*
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* Read a file from the same place as the bootflow came from
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*
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* @dev: Bootmethod device to use
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* @bflow: Bootflow providing info on where to read from
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* @file_path: Path to file (may be absolute or relative)
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* @addr: Address to load file
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* @sizep: On entry provides the maximum permitted size; on exit
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* returns the size of the file
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* Return: 0 if OK, -ENOSPC if the file is too large for @sizep, other
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* -ve value if something else goes wrong
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*/
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int (*read_file)(struct udevice *dev, struct bootflow *bflow,
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const char *file_path, ulong addr, ulong *sizep);
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#if CONFIG_IS_ENABLED(BOOTSTD_FULL)
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/**
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* readall() - read all files for a bootflow
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*
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* @dev: Bootmethod device to boot
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* @bflow: Bootflow to read
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* Return: 0 if OK, -EIO on I/O error, other -ve on other error
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*/
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int (*read_all)(struct udevice *dev, struct bootflow *bflow);
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#endif /* BOOTSTD_FULL */
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/**
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* boot() - boot a bootflow
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*
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* @dev: Bootmethod device to boot
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* @bflow: Bootflow to boot
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* Return: does not return on success, since it should boot the
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* Operating Systemn. Returns -EFAULT if that fails, -ENOTSUPP if
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* trying method resulted in finding out that is not actually
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* supported for this boot and should not be tried again unless
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* something changes, other -ve on other error
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*/
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int (*boot)(struct udevice *dev, struct bootflow *bflow);
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};
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#define bootmeth_get_ops(dev) ((struct bootmeth_ops *)(dev)->driver->ops)
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/**
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* bootmeth_get_state_desc() - get detailed state information
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*
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* Prodecues a textual description of the state of the bootmeth. This
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* can include newline characters if it extends to multiple lines. It
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* must be a nul-terminated string.
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*
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* This may involve reading state from the system, e.g. some data in
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* the firmware area.
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*
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* @dev: Bootmethod device to check
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* @buf: Buffer to place the info in (terminator must fit)
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* @maxsize: Size of buffer
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* Returns: 0 if OK, -ENOSPC is buffer is too small, other -ve error if
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* something else went wrong
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*/
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int bootmeth_get_state_desc(struct udevice *dev, char *buf, int maxsize);
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/**
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* bootmeth_check() - check if a bootmeth supports this bootflow
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*
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* This is optional. If not provided, the bootdev is assumed to be
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* supported
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*
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* The bootmeth can check the bootdev (e.g. to make sure it is a
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* network device) or the partition information. The following fields
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* in @iter are available:
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*
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* name, dev, state, part
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* max_part may be set if part != 0 (i.e. there is a valid partition
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* table). Otherwise max_part is 0
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* method is available but is the same as @dev
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* the partition has not yet been read, nor has the filesystem been
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* checked
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*
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* It may update only the flags in @iter
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*
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* @dev: Bootmethod device to check against
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* @iter: On entry, provides bootdev, hwpart, part
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* Return: 0 if OK, -ENOTSUPP if this bootdev is not supported
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*/
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int bootmeth_check(struct udevice *dev, struct bootflow_iter *iter);
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/**
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* bootmeth_read_bootflow() - set up a bootflow for a device
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*
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* @dev: Bootmethod device to check
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* @bflow: On entry, provides dev, hwpart, part and method.
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* Returns updated bootflow if found
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* Return: 0 if OK, -ve on error
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*/
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int bootmeth_read_bootflow(struct udevice *dev, struct bootflow *bflow);
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/**
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* bootmeth_set_bootflow() - set the bootflow for a device
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*
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* This provides a bootflow file to the bootmeth, to see if it is valid.
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* If it is, the bootflow is set up accordingly.
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*
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* @dev: Bootmethod device to use
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* @bflow: On entry, provides bootdev.
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* Returns updated bootflow if found
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* @buf: Buffer containing the possible bootflow file (must be allocated
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* by caller to @size + 1 bytes)
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* @size: Size of file
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* Return: 0 if OK, -ve on error
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*/
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int bootmeth_set_bootflow(struct udevice *dev, struct bootflow *bflow,
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char *buf, int size);
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/**
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* bootmeth_read_file() - read a file needed for a bootflow
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*
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* Read a file from the same place as the bootflow came from
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*
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* @dev: Bootmethod device to use
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* @bflow: Bootflow providing info on where to read from
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* @file_path: Path to file (may be absolute or relative)
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* @addr: Address to load file
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* @sizep: On entry provides the maximum permitted size; on exit
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* returns the size of the file
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* Return: 0 if OK, -ENOSPC if the file is too large for @sizep, other
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* -ve value if something else goes wrong
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*/
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int bootmeth_read_file(struct udevice *dev, struct bootflow *bflow,
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const char *file_path, ulong addr, ulong *sizep);
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/**
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* bootmeth_read_all() - read all bootflow files
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*
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* Some bootmeths delay reading of large files until booting is requested. This
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* causes those files to be read.
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*
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* @dev: Bootmethod device to use
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* @bflow: Bootflow to read
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* Return: does not return on success, since it should boot the
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* Operating Systemn. Returns -EFAULT if that fails, other -ve on
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* other error
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*/
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int bootmeth_read_all(struct udevice *dev, struct bootflow *bflow);
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/**
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* bootmeth_boot() - boot a bootflow
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*
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* @dev: Bootmethod device to boot
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* @bflow: Bootflow to boot
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* Return: does not return on success, since it should boot the
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* Operating Systemn. Returns -EFAULT if that fails, other -ve on
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* other error
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*/
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int bootmeth_boot(struct udevice *dev, struct bootflow *bflow);
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/**
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* bootmeth_setup_iter_order() - Set up the ordering of bootmeths to scan
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*
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* This sets up the ordering information in @iter, based on the selected
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* ordering of the bootmethds in bootstd_priv->bootmeth_order. If there is no
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* ordering there, then all bootmethods are added
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*
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* @iter: Iterator to update with the order
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* @include_global: true to add the global bootmeths, in which case they appear
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* first
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* Return: 0 if OK, -ENOENT if no bootdevs, -ENOMEM if out of memory, other -ve
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* on other error
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*/
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int bootmeth_setup_iter_order(struct bootflow_iter *iter, bool include_global);
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/**
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* bootmeth_set_order() - Set the bootmeth order
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*
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* This selects the ordering to use for bootmeths
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*
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* @order_str: String containing the ordering. This is a comma-separate list of
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* bootmeth-device names, e.g. "extlinux,efi". If empty then a default ordering
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* is used, based on the sequence number of devices (i.e. using aliases)
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* Return: 0 if OK, -ENODEV if an unknown bootmeth is mentioned, -ENOMEM if
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* out of memory, -ENOENT if there are no bootmeth devices
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*/
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int bootmeth_set_order(const char *order_str);
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/**
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* bootmeth_setup_fs() - Set up read to read a file
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*
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* We must redo the setup before each filesystem operation. This function
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* handles that, including setting the filesystem type if a block device is not
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* being used
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*
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* @bflow: Information about file to try
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* @desc: Block descriptor to read from (NULL if not a block device)
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* Return: 0 if OK, -ve on error
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*/
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int bootmeth_setup_fs(struct bootflow *bflow, struct blk_desc *desc);
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/**
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* bootmeth_try_file() - See we can access a given file
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*
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* Check for a file with a given name. If found, the filename is allocated in
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* @bflow
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*
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* Sets the state to BOOTFLOWST_FILE on success. It also calls
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* fs_set_blk_dev_with_part() so that this does not need to be done by the
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* caller before reading the file.
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*
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* @bflow: Information about file to try
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* @desc: Block descriptor to read from (NULL for sandbox host)
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* @prefix: Filename prefix to prepend to @fname (NULL for none)
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* @fname: Filename to read
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* Return: 0 if OK, -ENOMEM if not enough memory to allocate bflow->fname,
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* other -ve value on other error
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*/
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int bootmeth_try_file(struct bootflow *bflow, struct blk_desc *desc,
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const char *prefix, const char *fname);
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/**
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* bootmeth_alloc_file() - Allocate and read a bootflow file
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*
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* Allocates memory for a bootflow file and reads it in. Sets the state to
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* BOOTFLOWST_READY on success
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*
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* Note that fs_set_blk_dev_with_part() must have been called previously.
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*
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* @bflow: Information about file to read
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* @size_limit: Maximum file size to permit
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* @align: Allocation alignment (1 for unaligned)
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* Return: 0 if OK, -E2BIG if file is too large, -ENOMEM if out of memory,
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* other -ve on other error
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*/
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int bootmeth_alloc_file(struct bootflow *bflow, uint size_limit, uint align);
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/**
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* bootmeth_alloc_other() - Allocate and read a file for a bootflow
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*
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* This reads an arbitrary file in the same directory as the bootflow,
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* allocating memory for it. The buffer is one byte larger than the file length,
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* so that it can be nul-terminated.
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*
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* @bflow: Information about file to read
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* @fname: Filename to read from (within bootflow->subdir)
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* @bufp: Returns a pointer to the allocated buffer
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* @sizep: Returns the size of the buffer
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* Return: 0 if OK, -ENOMEM if out of memory, other -ve on other error
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*/
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int bootmeth_alloc_other(struct bootflow *bflow, const char *fname,
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void **bufp, uint *sizep);
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/**
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* bootmeth_common_read_file() - Common handler for reading a file
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*
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* Reads a named file from the same location as the bootflow file.
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*
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* @dev: bootmeth device to read from
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* @bflow: Bootflow information
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* @file_path: Path to file
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* @addr: Address to load file to
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* @sizep: On entry, the maximum file size to accept, on exit the actual file
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* size read
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*/
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int bootmeth_common_read_file(struct udevice *dev, struct bootflow *bflow,
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const char *file_path, ulong addr, ulong *sizep);
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/**
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* bootmeth_get_bootflow() - Get a bootflow from a global bootmeth
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*
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* Check the bootmeth for a bootflow which can be used. In this case the
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* bootmeth handles all bootdev selection, etc.
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*
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* @dev: bootmeth device to read from
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* @bflow: Bootflow information
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* @return 0 on success, -ve if a bootflow could not be found or had an error
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*/
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int bootmeth_get_bootflow(struct udevice *dev, struct bootflow *bflow);
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#endif
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