1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright 2021 Google LLC
4 * Written by Simon Glass <sjg@chromium.org>
11 #include <dm/ofnode_decl.h>
12 #include <linux/list.h>
18 BOOTFLOW_MAX_USED_DEVS = 16,
22 * enum bootflow_state_t - states that a particular bootflow can be in
24 * Only bootflows in state BOOTFLOWST_READY can be used to boot.
26 * See bootflow_state[] for the names for each of these
28 enum bootflow_state_t {
29 BOOTFLOWST_BASE, /**< Nothing known yet */
30 BOOTFLOWST_MEDIA, /**< Media exists */
31 BOOTFLOWST_PART, /**< Partition exists */
32 BOOTFLOWST_FS, /**< Filesystem exists */
33 BOOTFLOWST_FILE, /**< Bootflow file exists */
34 BOOTFLOWST_READY, /**< Bootflow file loaded */
40 * enum bootflow_flags_t - flags for bootflows
42 * @BOOTFLOWF_USE_PRIOR_FDT: Indicates that an FDT was not found by the bootmeth
43 * and it is using the prior-stage FDT, which is the U-Boot control FDT.
44 * This is only possible with the EFI bootmeth (distro-efi) and only when
45 * CONFIG_OF_HAS_PRIOR_STAGE is enabled
47 enum bootflow_flags_t {
48 BOOTFLOWF_USE_PRIOR_FDT = 1 << 0,
52 * struct bootflow - information about a bootflow
54 * This is connected into two separate linked lists:
56 * bm_sibling - links all bootflows in the same bootdev
57 * glob_sibling - links all bootflows in all bootdevs
59 * @bm_node: Points to siblings in the same bootdev
60 * @glob_node: Points to siblings in the global list (all bootdev)
61 * @dev: Bootdevice device which produced this bootflow
62 * @blk: Block device which contains this bootflow, NULL if this is a network
63 * device or sandbox 'host' device
64 * @part: Partition number (0 for whole device)
65 * @fs_type: Filesystem type (FS_TYPE...) if this is fixed by the media, else 0.
66 * For example, the sandbox host-filesystem bootdev sets this to
68 * @method: Bootmethod device used to perform the boot and read files
69 * @name: Name of bootflow (allocated)
70 * @state: Current state (enum bootflow_state_t)
71 * @subdir: Subdirectory to fetch files from (with trailing /), or NULL if none
72 * @fname: Filename of bootflow file (allocated)
73 * @logo: Logo to display for this bootflow (BMP format)
74 * @logo_size: Size of the logo in bytes
75 * @buf: Bootflow file contents (allocated)
76 * @size: Size of bootflow file in bytes
77 * @err: Error number received (0 if OK)
78 * @os_name: Name of the OS / distro being booted, or NULL if not known
80 * @fdt_fname: Filename of FDT file
81 * @fdt_size: Size of FDT file
82 * @fdt_addr: Address of loaded fdt
83 * @flags: Flags for the bootflow (see enum bootflow_flags_t)
86 struct list_head bm_node;
87 struct list_head glob_node;
92 struct udevice *method;
94 enum bootflow_state_t state;
110 * enum bootflow_iter_flags_t - flags for the bootflow iterator
112 * @BOOTFLOWIF_FIXED: Only used fixed/internal media
113 * @BOOTFLOWIF_SHOW: Show each bootdev before scanning it; show each hunter
115 * @BOOTFLOWIF_ALL: Return bootflows with errors as well
116 * @BOOTFLOWIF_HUNT: Hunt for new bootdevs using the bootdrv hunters
119 * @BOOTFLOWIF_SINGLE_DEV: (internal) Just scan one bootdev
120 * @BOOTFLOWIF_SKIP_GLOBAL: (internal) Don't scan global bootmeths
121 * @BOOTFLOWIF_SINGLE_UCLASS: (internal) Keep scanning through all devices in
122 * this uclass (used with things like "mmc")
123 * @BOOTFLOWIF_SINGLE_MEDIA: (internal) Scan one media device in the uclass (used
124 * with things like "mmc1")
126 enum bootflow_iter_flags_t {
127 BOOTFLOWIF_FIXED = 1 << 0,
128 BOOTFLOWIF_SHOW = 1 << 1,
129 BOOTFLOWIF_ALL = 1 << 2,
130 BOOTFLOWIF_HUNT = 1 << 3,
133 * flags used internally by standard boot - do not set these when
134 * calling bootflow_scan_bootdev() etc.
136 BOOTFLOWIF_SINGLE_DEV = 1 << 16,
137 BOOTFLOWIF_SKIP_GLOBAL = 1 << 17,
138 BOOTFLOWIF_SINGLE_UCLASS = 1 << 18,
139 BOOTFLOWIF_SINGLE_MEDIA = 1 << 19,
143 * enum bootflow_meth_flags_t - flags controlling which bootmeths are used
145 * Used during iteration, e.g. by bootdev_find_by_label(), to determine which
146 * bootmeths are used for the current bootdev. The flags reset when the bootdev
149 * @BOOTFLOW_METHF_DHCP_ONLY: Only use dhcp (scripts and EFI)
150 * @BOOTFLOW_METHF_PXE_ONLY: Only use pxe (PXE boot)
151 * @BOOTFLOW_METHF_SINGLE_DEV: Scan only a single bootdev (used for labels like
152 * "3"). This is used if a sequence number is provided instead of a label
153 * @BOOTFLOW_METHF_SINGLE_UCLASS: Scan all bootdevs in this one uclass (used
154 * with things like "mmc"). If this is not set, then the bootdev has an integer
155 * value in the label (like "mmc2")
157 enum bootflow_meth_flags_t {
158 BOOTFLOW_METHF_DHCP_ONLY = 1 << 0,
159 BOOTFLOW_METHF_PXE_ONLY = 1 << 1,
160 BOOTFLOW_METHF_SINGLE_DEV = 1 << 2,
161 BOOTFLOW_METHF_SINGLE_UCLASS = 1 << 3,
165 * struct bootflow_iter - state for iterating through bootflows
167 * This starts at with the first bootdev/partition/bootmeth and can be used to
168 * iterate through all of them.
170 * Iteration starts with the bootdev. The first partition (0, i.e. whole device)
171 * is scanned first. For partition 0, it iterates through all the available
172 * bootmeths to see which one(s) can provide a bootflow. Then it moves to
173 * parition 1 (if there is one) and the process continues. Once all partitions
174 * are examined, it moves to the next bootdev.
176 * Initially @max_part is 0, meaning that only the whole device (@part=0) can be
177 * used. During scanning, if a partition table is found, then @max_part is
178 * updated to a larger value, no less than the number of available partitions.
179 * This ensures that iteration works through all partitions on the bootdev.
181 * @flags: Flags to use (see enum bootflow_iter_flags_t). If
182 * BOOTFLOWIF_GLOBAL_FIRST is enabled then the global bootmeths are being
183 * scanned, otherwise we have moved onto the bootdevs
184 * @dev: Current bootdev, NULL if none. This is only ever updated in
185 * bootflow_iter_set_dev()
186 * @part: Current partition number (0 for whole device)
187 * @method: Current bootmeth
188 * @max_part: Maximum hardware partition number in @dev, 0 if there is no
190 * @first_bootable: First bootable partition, or 0 if none
191 * @err: Error obtained from checking the last iteration. This is used to skip
192 * forward (e.g. to skip the current partition because it is not valid)
193 * -ESHUTDOWN: try next bootdev
194 * @num_devs: Number of bootdevs in @dev_used
195 * @max_devs: Maximum number of entries in @dev_used
196 * @dev_used: List of bootdevs used during iteration
197 * @labels: List of labels to scan for bootdevs
198 * @cur_label: Current label being processed
199 * @num_methods: Number of bootmeth devices in @method_order
200 * @cur_method: Current method number, an index into @method_order
201 * @first_glob_method: First global method, if any, else -1
202 * @cur_prio: Current priority being scanned
203 * @method_order: List of bootmeth devices to use, in order. The normal methods
204 * appear first, then the global ones, if any
205 * @doing_global: true if we are iterating through the global bootmeths (which
206 * happens before the normal ones)
207 * @method_flags: flags controlling which methods should be used for this @dev
208 * (enum bootflow_meth_flags_t)
210 struct bootflow_iter {
214 struct udevice *method;
220 struct udevice *dev_used[BOOTFLOW_MAX_USED_DEVS];
221 const char *const *labels;
225 int first_glob_method;
226 enum bootdev_prio_t cur_prio;
227 struct udevice **method_order;
233 * bootflow_init() - Set up a bootflow struct
235 * The bootflow is zeroed and set to state BOOTFLOWST_BASE
237 * @bflow: Struct to set up
238 * @bootdev: Bootdev to use
239 * @meth: Bootmeth to use
241 void bootflow_init(struct bootflow *bflow, struct udevice *bootdev,
242 struct udevice *meth);
245 * bootflow_iter_init() - Reset a bootflow iterator
247 * This sets everything to the starting point, ready for use.
249 * @iter: Place to store private info (inited by this call)
250 * @flags: Flags to use (see enum bootflow_iter_flags_t)
252 void bootflow_iter_init(struct bootflow_iter *iter, int flags);
255 * bootflow_iter_uninit() - Free memory used by an interator
257 * @iter: Iterator to free
259 void bootflow_iter_uninit(struct bootflow_iter *iter);
262 * bootflow_iter_drop_bootmeth() - Remove a bootmeth from an iterator
264 * Update the iterator so that the bootmeth will not be used again while this
267 * @iter: Iterator to update
268 * @bmeth: Boot method to remove
270 int bootflow_iter_drop_bootmeth(struct bootflow_iter *iter,
271 const struct udevice *bmeth);
274 * bootflow_scan_first() - find the first bootflow for a device or label
276 * If @flags includes BOOTFLOWIF_ALL then bootflows with errors are returned too
278 * @dev: Boot device to scan, NULL to work through all of them until it
279 * finds one that can supply a bootflow
280 * @label: Label to control the scan, NULL to work through all devices
281 * until it finds one that can supply a bootflow
282 * @iter: Place to store private info (inited by this call)
283 * @flags: Flags for iterator (enum bootflow_iter_flags_t). Note that if
284 * @dev is NULL, then BOOTFLOWIF_SKIP_GLOBAL is set automatically by this
286 * @bflow: Place to put the bootflow if found
287 * Return: 0 if found, -ENODEV if no device, other -ve on other error
288 * (iteration can continue)
290 int bootflow_scan_first(struct udevice *dev, const char *label,
291 struct bootflow_iter *iter, int flags,
292 struct bootflow *bflow);
295 * bootflow_scan_next() - find the next bootflow
297 * This works through the available bootdev devices until it finds one that
298 * can supply a bootflow. It then returns that bootflow
300 * @iter: Private info (as set up by bootflow_scan_first())
301 * @bflow: Place to put the bootflow if found
302 * Return: 0 if found, -ENODEV if no device, -ESHUTDOWN if no more bootflows,
303 * other -ve on other error (iteration can continue)
305 int bootflow_scan_next(struct bootflow_iter *iter, struct bootflow *bflow);
308 * bootflow_first_glob() - Get the first bootflow from the global list
310 * Returns the first bootflow in the global list, no matter what bootflow it is
313 * @bflowp: Returns a pointer to the bootflow
314 * Return: 0 if found, -ENOENT if there are no bootflows
316 int bootflow_first_glob(struct bootflow **bflowp);
319 * bootflow_next_glob() - Get the next bootflow from the global list
321 * Returns the next bootflow in the global list, no matter what bootflow it is
324 * @bflowp: On entry, the last bootflow returned , e.g. from
325 * bootflow_first_glob()
326 * Return: 0 if found, -ENOENT if there are no more bootflows
328 int bootflow_next_glob(struct bootflow **bflowp);
331 * bootflow_free() - Free memory used by a bootflow
333 * This frees fields within @bflow, but not the @bflow pointer itself
335 void bootflow_free(struct bootflow *bflow);
338 * bootflow_boot() - boot a bootflow
340 * @bflow: Bootflow to boot
341 * Return: -EPROTO if bootflow has not been loaded, -ENOSYS if the bootflow
342 * type is not supported, -EFAULT if the boot returned without an error
343 * when we are expecting it to boot, -ENOTSUPP if trying method resulted in
344 * finding out that is not actually supported for this boot and should not
345 * be tried again unless something changes
347 int bootflow_boot(struct bootflow *bflow);
350 * bootflow_run_boot() - Try to boot a bootflow
352 * @iter: Current iteration (or NULL if none). Used to disable a bootmeth if the
353 * boot returns -ENOTSUPP
354 * @bflow: Bootflow to boot
355 * Return: result of trying to boot
357 int bootflow_run_boot(struct bootflow_iter *iter, struct bootflow *bflow);
360 * bootflow_state_get_name() - Get the name of a bootflow state
362 * @state: State to check
363 * Return: name, or "?" if invalid
365 const char *bootflow_state_get_name(enum bootflow_state_t state);
368 * bootflow_remove() - Remove a bootflow and free its memory
370 * This updates the linked lists containing the bootflow then frees it.
372 * @bflow: Bootflow to remove
374 void bootflow_remove(struct bootflow *bflow);
377 * bootflow_iter_check_blk() - Check that a bootflow uses a block device
379 * This checks the bootdev in the bootflow to make sure it uses a block device
381 * Return: 0 if OK, -ENOTSUPP if some other device is used (e.g. ethernet)
383 int bootflow_iter_check_blk(const struct bootflow_iter *iter);
386 * bootflow_iter_check_sf() - Check that a bootflow uses SPI FLASH
388 * This checks the bootdev in the bootflow to make sure it uses SPI flash
390 * Return: 0 if OK, -ENOTSUPP if some other device is used (e.g. ethernet)
392 int bootflow_iter_check_sf(const struct bootflow_iter *iter);
395 * bootflow_iter_check_net() - Check that a bootflow uses a network device
397 * This checks the bootdev in the bootflow to make sure it uses a network
400 * Return: 0 if OK, -ENOTSUPP if some other device is used (e.g. MMC)
402 int bootflow_iter_check_net(const struct bootflow_iter *iter);
405 * bootflow_iter_check_system() - Check that a bootflow uses the bootstd device
407 * This checks the bootdev in the bootflow to make sure it uses the bootstd
410 * Return: 0 if OK, -ENOTSUPP if some other device is used (e.g. MMC)
412 int bootflow_iter_check_system(const struct bootflow_iter *iter);
415 * bootflow_menu_new() - Create a new bootflow menu
417 * @expp: Returns the expo created
418 * Returns 0 on success, -ve on error
420 int bootflow_menu_new(struct expo **expp);
423 * bootflow_menu_apply_theme() - Apply a theme to a bootmenu
425 * @exp: Expo to update
426 * @node: Node containing the theme information
427 * Returns 0 on success, -ve on error
429 int bootflow_menu_apply_theme(struct expo *exp, ofnode node);
432 * bootflow_menu_run() - Create and run a menu of available bootflows
434 * @std: Bootstd information
435 * @text_mode: Uses a text-based menu suitable for a serial port
436 * @bflowp: Returns chosen bootflow (set to NULL if nothing is chosen)
437 * @return 0 if an option was chosen, -EAGAIN if nothing was chosen, -ve on
440 int bootflow_menu_run(struct bootstd_priv *std, bool text_mode,
441 struct bootflow **bflowp);