xref: /openbmc/u-boot/include/part.h (revision cd7b6344)
1 /*
2  * (C) Copyright 2000-2004
3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4  *
5  * SPDX-License-Identifier:	GPL-2.0+
6  */
7 #ifndef _PART_H
8 #define _PART_H
9 
10 #include <blk.h>
11 #include <ide.h>
12 
13 struct block_drvr {
14 	char *name;
15 	int (*select_hwpart)(int dev_num, int hwpart);
16 };
17 
18 #define LOG2(x) (((x & 0xaaaaaaaa) ? 1 : 0) + ((x & 0xcccccccc) ? 2 : 0) + \
19 		 ((x & 0xf0f0f0f0) ? 4 : 0) + ((x & 0xff00ff00) ? 8 : 0) + \
20 		 ((x & 0xffff0000) ? 16 : 0))
21 #define LOG2_INVALID(type) ((type)((sizeof(type)<<3)-1))
22 
23 /* Part types */
24 #define PART_TYPE_UNKNOWN	0x00
25 #define PART_TYPE_MAC		0x01
26 #define PART_TYPE_DOS		0x02
27 #define PART_TYPE_ISO		0x03
28 #define PART_TYPE_AMIGA		0x04
29 #define PART_TYPE_EFI		0x05
30 
31 /* maximum number of partition entries supported by search */
32 #define DOS_ENTRY_NUMBERS	8
33 #define ISO_ENTRY_NUMBERS	64
34 #define MAC_ENTRY_NUMBERS	64
35 #define AMIGA_ENTRY_NUMBERS	8
36 /*
37  * Type string for U-Boot bootable partitions
38  */
39 #define BOOT_PART_TYPE	"U-Boot"	/* primary boot partition type	*/
40 #define BOOT_PART_COMP	"PPCBoot"	/* PPCBoot compatibility type	*/
41 
42 /* device types */
43 #define DEV_TYPE_UNKNOWN	0xff	/* not connected */
44 #define DEV_TYPE_HARDDISK	0x00	/* harddisk */
45 #define DEV_TYPE_TAPE		0x01	/* Tape */
46 #define DEV_TYPE_CDROM		0x05	/* CD-ROM */
47 #define DEV_TYPE_OPDISK		0x07	/* optical disk */
48 
49 typedef struct disk_partition {
50 	lbaint_t	start;	/* # of first block in partition	*/
51 	lbaint_t	size;	/* number of blocks in partition	*/
52 	ulong	blksz;		/* block size in bytes			*/
53 	uchar	name[32];	/* partition name			*/
54 	uchar	type[32];	/* string type description		*/
55 	int	bootable;	/* Active/Bootable flag is set		*/
56 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
57 	char	uuid[37];	/* filesystem UUID as string, if exists	*/
58 #endif
59 #ifdef CONFIG_PARTITION_TYPE_GUID
60 	char	type_guid[37];	/* type GUID as string, if exists	*/
61 #endif
62 } disk_partition_t;
63 
64 /* Misc _get_dev functions */
65 #ifdef CONFIG_PARTITIONS
66 /**
67  * blk_get_dev() - get a pointer to a block device given its type and number
68  *
69  * Each interface allocates its own devices and typically struct blk_desc is
70  * contained with the interface's data structure. There is no global
71  * numbering for block devices, so the interface name must be provided.
72  *
73  * @ifname:	Interface name (e.g. "ide", "scsi")
74  * @dev:	Device number (0 for first device on that interface, 1 for
75  *		second, etc.
76  * @return pointer to the block device, or NULL if not available, or an
77  *	   error occurred.
78  */
79 struct blk_desc *blk_get_dev(const char *ifname, int dev);
80 
81 struct blk_desc *mg_disk_get_dev(int dev);
82 int host_get_dev_err(int dev, struct blk_desc **blk_devp);
83 
84 /* disk/part.c */
85 int part_get_info(struct blk_desc *dev_desc, int part, disk_partition_t *info);
86 void part_print(struct blk_desc *dev_desc);
87 void part_init(struct blk_desc *dev_desc);
88 void dev_print(struct blk_desc *dev_desc);
89 
90 /**
91  * blk_get_device_by_str() - Get a block device given its interface/hw partition
92  *
93  * Each interface allocates its own devices and typically struct blk_desc is
94  * contained with the interface's data structure. There is no global
95  * numbering for block devices, so the interface name must be provided.
96  *
97  * The hardware parition is not related to the normal software partitioning
98  * of a device - each hardware partition is effectively a separately
99  * accessible block device. When a hardware parition is selected on MMC the
100  * other hardware partitions become inaccessible. The same block device is
101  * used to access all hardware partitions, but its capacity may change when a
102  * different hardware partition is selected.
103  *
104  * When a hardware partition number is given, the block device switches to
105  * that hardware partition.
106  *
107  * @ifname:	Interface name (e.g. "ide", "scsi")
108  * @dev_str:	Device and optional hw partition. This can either be a string
109  *		containing the device number (e.g. "2") or the device number
110  *		and hardware partition number (e.g. "2.4") for devices that
111  *		support it (currently only MMC).
112  * @dev_desc:	Returns a pointer to the block device on success
113  * @return block device number (local to the interface), or -1 on error
114  */
115 int blk_get_device_by_str(const char *ifname, const char *dev_str,
116 			  struct blk_desc **dev_desc);
117 
118 /**
119  * blk_get_device_part_str() - Get a block device and partition
120  *
121  * This calls blk_get_device_by_str() to look up a device. It also looks up
122  * a partition and returns information about it.
123  *
124  * @dev_part_str is in the format:
125  *	<dev>.<hw_part>:<part> where <dev> is the device number,
126  *	<hw_part> is the optional hardware partition number and
127  *	<part> is the partition number
128  *
129  * If ifname is "hostfs" then this function returns the sandbox host block
130  * device.
131  *
132  * If ifname is ubi, then this function returns 0, with @info set to a
133  * special UBI device.
134  *
135  * If @dev_part_str is NULL or empty or "-", then this function looks up
136  * the "bootdevice" environment variable and uses that string instead.
137  *
138  * If the partition string is empty then the first partition is used. If the
139  * partition string is "auto" then the first bootable partition is used.
140  *
141  * @ifname:	Interface name (e.g. "ide", "scsi")
142  * @dev_part_str:	Device and partition string
143  * @dev_desc:	Returns a pointer to the block device on success
144  * @info:	Returns partition information
145  * @allow_whole_dev:	true to allow the user to select partition 0
146  *		(which means the whole device), false to require a valid
147  *		partition number >= 1
148  * @return partition number, or -1 on error
149  *
150  */
151 int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
152 			    struct blk_desc **dev_desc,
153 			    disk_partition_t *info, int allow_whole_dev);
154 
155 /**
156  * part_get_info_by_name() - Search for a partition by name
157  *                           among all available registered partitions
158  *
159  * @param dev_desc - block device descriptor
160  * @param gpt_name - the specified table entry name
161  * @param info - returns the disk partition info
162  *
163  * @return - '0' on match, '-1' on no match, otherwise error
164  */
165 int part_get_info_by_name(struct blk_desc *dev_desc,
166 			      const char *name, disk_partition_t *info);
167 
168 /**
169  * part_set_generic_name() - create generic partition like hda1 or sdb2
170  *
171  * Helper function for partition tables, which don't hold partition names
172  * (DOS, ISO). Generates partition name out of the device type and partition
173  * number.
174  *
175  * @dev_desc:	pointer to the block device
176  * @part_num:	partition number for which the name is generated
177  * @name:	buffer where the name is written
178  */
179 void part_set_generic_name(const struct blk_desc *dev_desc,
180 	int part_num, char *name);
181 
182 extern const struct block_drvr block_drvr[];
183 #else
184 static inline struct blk_desc *blk_get_dev(const char *ifname, int dev)
185 { return NULL; }
186 static inline struct blk_desc *mg_disk_get_dev(int dev) { return NULL; }
187 
188 static inline int part_get_info(struct blk_desc *dev_desc, int part,
189 				disk_partition_t *info) { return -1; }
190 static inline void part_print(struct blk_desc *dev_desc) {}
191 static inline void part_init(struct blk_desc *dev_desc) {}
192 static inline void dev_print(struct blk_desc *dev_desc) {}
193 static inline int blk_get_device_by_str(const char *ifname, const char *dev_str,
194 					struct blk_desc **dev_desc)
195 { return -1; }
196 static inline int blk_get_device_part_str(const char *ifname,
197 					   const char *dev_part_str,
198 					   struct blk_desc **dev_desc,
199 					   disk_partition_t *info,
200 					   int allow_whole_dev)
201 { *dev_desc = NULL; return -1; }
202 #endif
203 
204 /*
205  * We don't support printing partition information in SPL and only support
206  * getting partition information in a few cases.
207  */
208 #ifdef CONFIG_SPL_BUILD
209 # define part_print_ptr(x)	NULL
210 # if defined(CONFIG_SPL_EXT_SUPPORT) || defined(CONFIG_SPL_FAT_SUPPORT) || \
211 	defined(CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_PARTITION)
212 #  define part_get_info_ptr(x)	x
213 # else
214 #  define part_get_info_ptr(x)	NULL
215 # endif
216 #else
217 #define part_print_ptr(x)	x
218 #define part_get_info_ptr(x)	x
219 #endif
220 
221 
222 struct part_driver {
223 	const char *name;
224 	int part_type;
225 	const int max_entries;	/* maximum number of entries to search */
226 
227 	/**
228 	 * get_info() - Get information about a partition
229 	 *
230 	 * @dev_desc:	Block device descriptor
231 	 * @part:	Partition number (1 = first)
232 	 * @info:	Returns partition information
233 	 */
234 	int (*get_info)(struct blk_desc *dev_desc, int part,
235 			disk_partition_t *info);
236 
237 	/**
238 	 * print() - Print partition information
239 	 *
240 	 * @dev_desc:	Block device descriptor
241 	 */
242 	void (*print)(struct blk_desc *dev_desc);
243 
244 	/**
245 	 * test() - Test if a device contains this partition type
246 	 *
247 	 * @dev_desc:	Block device descriptor
248 	 * @return 0 if the block device appears to contain this partition
249 	 *	   type, -ve if not
250 	 */
251 	int (*test)(struct blk_desc *dev_desc);
252 };
253 
254 /* Declare a new U-Boot partition 'driver' */
255 #define U_BOOT_PART_TYPE(__name)					\
256 	ll_entry_declare(struct part_driver, __name, part_driver)
257 
258 #if CONFIG_IS_ENABLED(EFI_PARTITION)
259 #include <part_efi.h>
260 /* disk/part_efi.c */
261 /**
262  * write_gpt_table() - Write the GUID Partition Table to disk
263  *
264  * @param dev_desc - block device descriptor
265  * @param gpt_h - pointer to GPT header representation
266  * @param gpt_e - pointer to GPT partition table entries
267  *
268  * @return - zero on success, otherwise error
269  */
270 int write_gpt_table(struct blk_desc *dev_desc,
271 		  gpt_header *gpt_h, gpt_entry *gpt_e);
272 
273 /**
274  * gpt_fill_pte(): Fill the GPT partition table entry
275  *
276  * @param gpt_h - GPT header representation
277  * @param gpt_e - GPT partition table entries
278  * @param partitions - list of partitions
279  * @param parts - number of partitions
280  *
281  * @return zero on success
282  */
283 int gpt_fill_pte(gpt_header *gpt_h, gpt_entry *gpt_e,
284 		disk_partition_t *partitions, int parts);
285 
286 /**
287  * gpt_fill_header(): Fill the GPT header
288  *
289  * @param dev_desc - block device descriptor
290  * @param gpt_h - GPT header representation
291  * @param str_guid - disk guid string representation
292  * @param parts_count - number of partitions
293  *
294  * @return - error on str_guid conversion error
295  */
296 int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h,
297 		char *str_guid, int parts_count);
298 
299 /**
300  * gpt_restore(): Restore GPT partition table
301  *
302  * @param dev_desc - block device descriptor
303  * @param str_disk_guid - disk GUID
304  * @param partitions - list of partitions
305  * @param parts - number of partitions
306  *
307  * @return zero on success
308  */
309 int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid,
310 		disk_partition_t *partitions, const int parts_count);
311 
312 /**
313  * is_valid_gpt_buf() - Ensure that the Primary GPT information is valid
314  *
315  * @param dev_desc - block device descriptor
316  * @param buf - buffer which contains the MBR and Primary GPT info
317  *
318  * @return - '0' on success, otherwise error
319  */
320 int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf);
321 
322 /**
323  * write_mbr_and_gpt_partitions() - write MBR, Primary GPT and Backup GPT
324  *
325  * @param dev_desc - block device descriptor
326  * @param buf - buffer which contains the MBR and Primary GPT info
327  *
328  * @return - '0' on success, otherwise error
329  */
330 int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf);
331 
332 /**
333  * gpt_verify_headers() - Function to read and CRC32 check of the GPT's header
334  *                        and partition table entries (PTE)
335  *
336  * As a side effect if sets gpt_head and gpt_pte so they point to GPT data.
337  *
338  * @param dev_desc - block device descriptor
339  * @param gpt_head - pointer to GPT header data read from medium
340  * @param gpt_pte - pointer to GPT partition table enties read from medium
341  *
342  * @return - '0' on success, otherwise error
343  */
344 int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
345 		       gpt_entry **gpt_pte);
346 
347 /**
348  * gpt_verify_partitions() - Function to check if partitions' name, start and
349  *                           size correspond to '$partitions' env variable
350  *
351  * This function checks if on medium stored GPT data is in sync with information
352  * provided in '$partitions' environment variable. Specificially, name, start
353  * and size of the partition is checked.
354  *
355  * @param dev_desc - block device descriptor
356  * @param partitions - partition data read from '$partitions' env variable
357  * @param parts - number of partitions read from '$partitions' env variable
358  * @param gpt_head - pointer to GPT header data read from medium
359  * @param gpt_pte - pointer to GPT partition table enties read from medium
360  *
361  * @return - '0' on success, otherwise error
362  */
363 int gpt_verify_partitions(struct blk_desc *dev_desc,
364 			  disk_partition_t *partitions, int parts,
365 			  gpt_header *gpt_head, gpt_entry **gpt_pte);
366 #endif
367 
368 #if CONFIG_IS_ENABLED(DOS_PARTITION)
369 /**
370  * is_valid_dos_buf() - Ensure that a DOS MBR image is valid
371  *
372  * @param buf - buffer which contains the MBR
373  *
374  * @return - '0' on success, otherwise error
375  */
376 int is_valid_dos_buf(void *buf);
377 
378 /**
379  * write_mbr_partition() - write DOS MBR
380  *
381  * @param dev_desc - block device descriptor
382  * @param buf - buffer which contains the MBR
383  *
384  * @return - '0' on success, otherwise error
385  */
386 int write_mbr_partition(struct blk_desc *dev_desc, void *buf);
387 
388 #endif
389 
390 
391 #endif /* _PART_H */
392