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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Copyright 2021 Google LLC
* Written by Simon Glass <sjg@chromium.org>
*/
#ifndef __bootmeth_h
#define __bootmeth_h
struct blk_desc;
struct bootflow;
struct bootflow_iter;
struct udevice;
/**
* struct bootmeth_uc_plat - information the uclass keeps about each bootmeth
*
* @desc: A long description of the bootmeth
*/
struct bootmeth_uc_plat {
const char *desc;
};
/** struct bootmeth_ops - Operations for boot methods */
struct bootmeth_ops {
/**
* check_supported() - check if a bootmeth supports this bootflow
*
* This is optional. If not provided, the bootdev is assumed to be
* supported
*
* The bootmeth can check the bootdev (e.g. to make sure it is a
* network device) or the partition information. The following fields
* in @iter are available:
*
* name, dev, state, part
* max_part may be set if part != 0 (i.e. there is a valid partition
* table). Otherwise max_part is 0
* method is available but is the same as @dev
* the partition has not yet been read, nor has the filesystem been
* checked
*
* It may update only the flags in @iter
*
* @dev: Bootmethod device to check against
* @iter: On entry, provides bootdev, hwpart, part
* Return: 0 if OK, -ENOTSUPP if this bootdev is not supported
*/
int (*check)(struct udevice *dev, struct bootflow_iter *iter);
/**
* read_bootflow() - read a bootflow for a device
*
* @dev: Bootmethod device to use
* @bflow: On entry, provides dev, hwpart, part and method.
* Returns updated bootflow if found
* Return: 0 if OK, -ve on error
*/
int (*read_bootflow)(struct udevice *dev, struct bootflow *bflow);
/**
* read_file() - read a file needed for a bootflow
*
* Read a file from the same place as the bootflow came from
*
* @dev: Bootmethod device to use
* @bflow: Bootflow providing info on where to read from
* @file_path: Path to file (may be absolute or relative)
* @addr: Address to load file
* @sizep: On entry provides the maximum permitted size; on exit
* returns the size of the file
* Return: 0 if OK, -ENOSPC if the file is too large for @sizep, other
* -ve value if something else goes wrong
*/
int (*read_file)(struct udevice *dev, struct bootflow *bflow,
const char *file_path, ulong addr, ulong *sizep);
/**
* boot() - boot a bootflow
*
* @dev: Bootmethod device to boot
* @bflow: Bootflow to boot
* Return: does not return on success, since it should boot the
* Operating Systemn. Returns -EFAULT if that fails, -ENOTSUPP if
* trying method resulted in finding out that is not actually
* supported for this boot and should not be tried again unless
* something changes, other -ve on other error
*/
int (*boot)(struct udevice *dev, struct bootflow *bflow);
};
#define bootmeth_get_ops(dev) ((struct bootmeth_ops *)(dev)->driver->ops)
/**
* bootmeth_check() - check if a bootmeth supports this bootflow
*
* This is optional. If not provided, the bootdev is assumed to be
* supported
*
* The bootmeth can check the bootdev (e.g. to make sure it is a
* network device) or the partition information. The following fields
* in @iter are available:
*
* name, dev, state, part
* max_part may be set if part != 0 (i.e. there is a valid partition
* table). Otherwise max_part is 0
* method is available but is the same as @dev
* the partition has not yet been read, nor has the filesystem been
* checked
*
* It may update only the flags in @iter
*
* @dev: Bootmethod device to check against
* @iter: On entry, provides bootdev, hwpart, part
* Return: 0 if OK, -ENOTSUPP if this bootdev is not supported
*/
int bootmeth_check(struct udevice *dev, struct bootflow_iter *iter);
/**
* bootmeth_read_bootflow() - set up a bootflow for a device
*
* @dev: Bootmethod device to check
* @bflow: On entry, provides dev, hwpart, part and method.
* Returns updated bootflow if found
* Return: 0 if OK, -ve on error
*/
int bootmeth_read_bootflow(struct udevice *dev, struct bootflow *bflow);
/**
* bootmeth_read_file() - read a file needed for a bootflow
*
* Read a file from the same place as the bootflow came from
*
* @dev: Bootmethod device to use
* @bflow: Bootflow providing info on where to read from
* @file_path: Path to file (may be absolute or relative)
* @addr: Address to load file
* @sizep: On entry provides the maximum permitted size; on exit
* returns the size of the file
* Return: 0 if OK, -ENOSPC if the file is too large for @sizep, other
* -ve value if something else goes wrong
*/
int bootmeth_read_file(struct udevice *dev, struct bootflow *bflow,
const char *file_path, ulong addr, ulong *sizep);
/**
* bootmeth_boot() - boot a bootflow
*
* @dev: Bootmethod device to boot
* @bflow: Bootflow to boot
* Return: does not return on success, since it should boot the
* Operating Systemn. Returns -EFAULT if that fails, other -ve on
* other error
*/
int bootmeth_boot(struct udevice *dev, struct bootflow *bflow);
/**
* bootmeth_setup_iter_order() - Set up the ordering of bootmeths to scan
*
* This sets up the ordering information in @iter, based on the selected
* ordering of the bootmethds in bootstd_priv->bootmeth_order. If there is no
* ordering there, then all bootmethods are added
*
* @iter: Iterator to update with the order
* Return: 0 if OK, -ENOENT if no bootdevs, -ENOMEM if out of memory, other -ve
* on other error
*/
int bootmeth_setup_iter_order(struct bootflow_iter *iter);
/**
* bootmeth_set_order() - Set the bootmeth order
*
* This selects the ordering to use for bootmeths
*
* @order_str: String containing the ordering. This is a comma-separate list of
* bootmeth-device names, e.g. "syslinux,efi". If empty then a default ordering
* is used, based on the sequence number of devices (i.e. using aliases)
* Return: 0 if OK, -ENODEV if an unknown bootmeth is mentioned, -ENOMEM if
* out of memory, -ENOENT if there are no bootmeth devices
*/
int bootmeth_set_order(const char *order_str);
/**
* bootmeth_try_file() - See we can access a given file
*
* Check for a file with a given name. If found, the filename is allocated in
* @bflow
*
* Sets the state to BOOTFLOWST_FILE on success. It also calls
* fs_set_blk_dev_with_part() so that this does not need to be done by the
* caller before reading the file.
*
* @bflow: Information about file to try
* @desc: Block descriptor to read from
* @prefix: Filename prefix to prepend to @fname (NULL for none)
* @fname: Filename to read
* Return: 0 if OK, -ENOMEM if not enough memory to allocate bflow->fname,
* other -ve value on other error
*/
int bootmeth_try_file(struct bootflow *bflow, struct blk_desc *desc,
const char *prefix, const char *fname);
/**
* bootmeth_alloc_file() - Allocate and read a bootflow file
*
* Allocates memory for a bootflow file and reads it in. Sets the state to
* BOOTFLOWST_READY on success
*
* Note that fs_set_blk_dev_with_part() must have been called previously.
*
* @bflow: Information about file to read
* @size_limit: Maximum file size to permit
* @align: Allocation alignment (1 for unaligned)
* Return: 0 if OK, -E2BIG if file is too large, -ENOMEM if out of memory,
* other -ve on other error
*/
int bootmeth_alloc_file(struct bootflow *bflow, uint size_limit, uint align);
/**
* bootmeth_common_read_file() - Common handler for reading a file
*
* Reads a named file from the same location as the bootflow file.
*
* @dev: bootmeth device to read from
* @bflow: Bootflow information
* @file_path: Path to file
* @addr: Address to load file to
* @sizep: On entry, the maximum file size to accept, on exit the actual file
* size read
*/
int bootmeth_common_read_file(struct udevice *dev, struct bootflow *bflow,
const char *file_path, ulong addr, ulong *sizep);
#endif
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