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Tom Rini83d290c2018-05-06 17:58:06 -04001/* SPDX-License-Identifier: GPL-2.0+ */
Simon Glass7a9219c2011-10-03 19:26:44 +00002/*
Simon Glassd9165152012-02-20 23:56:58 -05003 * Operating System Interface
4 *
5 * This provides access to useful OS routines for the sandbox architecture.
6 * They are kept in a separate file so we can include system headers.
7 *
Simon Glass7a9219c2011-10-03 19:26:44 +00008 * Copyright (c) 2011 The Chromium OS Authors.
Simon Glass7a9219c2011-10-03 19:26:44 +00009 */
10
Mike Frysinger4f345d52012-01-19 22:57:29 -050011#ifndef __OS_H__
12#define __OS_H__
13
Simon Glass2a54d152013-05-19 16:45:35 -070014#include <linux/types.h>
15
Simon Glass94eefde2015-04-20 12:37:22 -060016struct rtc_time;
Simon Glass70db4212012-02-15 15:51:16 -080017struct sandbox_state;
18
Simon Glass7a9219c2011-10-03 19:26:44 +000019/**
Heinrich Schuchardt7750ee42022-04-04 22:45:03 +020020 * os_printf() - print directly to OS console
21 *
22 * @format: format string
23 */
24int os_printf(const char *format, ...);
25
26/**
Simon Glass7a9219c2011-10-03 19:26:44 +000027 * Access to the OS read() system call
28 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +010029 * @fd: File descriptor as returned by os_open()
30 * @buf: Buffer to place data
31 * @count: Number of bytes to read
32 * Return: number of bytes read, or -1 on error
Simon Glass7a9219c2011-10-03 19:26:44 +000033 */
34ssize_t os_read(int fd, void *buf, size_t count);
35
36/**
37 * Access to the OS write() system call
38 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +010039 * @fd: File descriptor as returned by os_open()
40 * @buf: Buffer containing data to write
41 * @count: Number of bytes to write
42 * Return: number of bytes written, or -1 on error
Simon Glass7a9219c2011-10-03 19:26:44 +000043 */
44ssize_t os_write(int fd, const void *buf, size_t count);
45
46/**
Mike Frysingere2dcefc2011-10-25 13:02:58 +020047 * Access to the OS lseek() system call
48 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +010049 * @fd: File descriptor as returned by os_open()
50 * @offset: File offset (based on whence)
51 * @whence: Position offset is relative to (see below)
52 * Return: new file offset
Mike Frysingere2dcefc2011-10-25 13:02:58 +020053 */
54off_t os_lseek(int fd, off_t offset, int whence);
55
56/* Defines for "whence" in os_lseek() */
57#define OS_SEEK_SET 0
58#define OS_SEEK_CUR 1
59#define OS_SEEK_END 2
60
61/**
Simon Glassb4467fa2021-08-18 21:40:30 -060062 * os_filesize() - Calculate the size of a file
63 *
64 * @fd: File descriptor as returned by os_open()
65 * Return: file size or negative error code
66 */
67int os_filesize(int fd);
68
69/**
Simon Glass7a9219c2011-10-03 19:26:44 +000070 * Access to the OS open() system call
71 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +010072 * @pathname: Pathname of file to open
73 * @flags: Flags, like OS_O_RDONLY, OS_O_RDWR
74 * Return: file descriptor, or -1 on error
Simon Glass7a9219c2011-10-03 19:26:44 +000075 */
76int os_open(const char *pathname, int flags);
77
Simon Glassd9165152012-02-20 23:56:58 -050078#define OS_O_RDONLY 0
79#define OS_O_WRONLY 1
80#define OS_O_RDWR 2
81#define OS_O_MASK 3 /* Mask for read/write flags */
82#define OS_O_CREAT 0100
Simon Glass50b288a2018-10-01 11:55:07 -060083#define OS_O_TRUNC 01000
Simon Glassd9165152012-02-20 23:56:58 -050084
Simon Glass7a9219c2011-10-03 19:26:44 +000085/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +010086 * os_close() - access to the OS close() system call
Simon Glass7a9219c2011-10-03 19:26:44 +000087 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +010088 * @fd: File descriptor to close
89 * Return: 0 on success, -1 on error
Simon Glass7a9219c2011-10-03 19:26:44 +000090 */
91int os_close(int fd);
92
93/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +010094 * os_unlink() - access to the OS unlink() system call
Stephen Warrencfd13e82014-03-01 22:18:00 -070095 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +010096 * @pathname: Path of file to delete
97 * Return: 0 for success, other for error
Stephen Warrencfd13e82014-03-01 22:18:00 -070098 */
99int os_unlink(const char *pathname);
100
101/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100102 * os_exit() - access to the OS exit() system call
Simon Glass7a9219c2011-10-03 19:26:44 +0000103 *
104 * This exits with the supplied return code, which should be 0 to indicate
105 * success.
106 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100107 * @exit_code: exit code for U-Boot
Simon Glass7a9219c2011-10-03 19:26:44 +0000108 */
Mike Frysinger9d72e672012-02-26 17:46:30 -0500109void os_exit(int exit_code) __attribute__((noreturn));
Mike Frysingerab06a752011-10-26 00:21:29 +0000110
111/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100112 * os_tty_raw() - put tty into raw mode to mimic serial console better
Simon Glassffb87902014-02-27 13:26:22 -0700113 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100114 * @fd: File descriptor of stdin (normally 0)
115 * @allow_sigs: Allow Ctrl-C, Ctrl-Z to generate signals rather than
116 * be handled by U-Boot
Mike Frysingerab06a752011-10-26 00:21:29 +0000117 */
Simon Glassffb87902014-02-27 13:26:22 -0700118void os_tty_raw(int fd, bool allow_sigs);
Matthias Weisser21899b12011-11-05 11:40:34 +0100119
120/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100121 * os_fs_restore() - restore the tty to its original mode
Simon Glass8939df02015-05-10 21:07:27 -0600122 *
123 * Call this to restore the original terminal mode, after it has been changed
124 * by os_tty_raw(). This is an internal function.
125 */
126void os_fd_restore(void);
127
128/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100129 * os_malloc() - aquires some memory from the underlying os.
Matthias Weisser21899b12011-11-05 11:40:34 +0100130 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100131 * @length: Number of bytes to be allocated
Simon Glass14e46df2021-02-06 09:57:32 -0700132 * Return: Pointer to length bytes or NULL if @length is 0 or on error
Matthias Weisser21899b12011-11-05 11:40:34 +0100133 */
134void *os_malloc(size_t length);
Matthias Weisserd99a6872011-11-29 12:16:40 +0100135
136/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100137 * os_free() - free memory previous allocated with os_malloc()
Simon Glass77595c62013-11-10 10:26:57 -0700138 *
139 * This returns the memory to the OS.
140 *
Simon Glassb308d9f2021-02-06 09:57:33 -0700141 * @ptr: Pointer to memory block to free. If this is NULL then this
142 * function does nothing
Simon Glass77595c62013-11-10 10:26:57 -0700143 */
Masahiro Yamada347d06d2014-01-15 13:06:41 +0900144void os_free(void *ptr);
Simon Glass77595c62013-11-10 10:26:57 -0700145
146/**
Simon Glass14e46df2021-02-06 09:57:32 -0700147 * os_realloc() - reallocate memory
148 *
149 * This follows the semantics of realloc(), so can perform an os_malloc() or
150 * os_free() depending on @ptr and @length.
151 *
Heinrich Schuchardt4c30d182021-03-28 11:05:00 +0200152 * @ptr: pointer to previously allocated memory of NULL
153 * @length: number of bytes to allocate
154 * Return: pointer to reallocated memory or NULL if @length is 0
Simon Glass14e46df2021-02-06 09:57:32 -0700155 */
156void *os_realloc(void *ptr, size_t length);
157
158/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100159 * os_usleep() - access to the usleep function of the os
Matthias Weisserd99a6872011-11-29 12:16:40 +0100160 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100161 * @usec: time to sleep in micro seconds
Matthias Weisserd99a6872011-11-29 12:16:40 +0100162 */
163void os_usleep(unsigned long usec);
164
165/**
166 * Gets a monotonic increasing number of nano seconds from the OS
167 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100168 * Return: a monotonic increasing time scaled in nano seconds
Matthias Weisserd99a6872011-11-29 12:16:40 +0100169 */
Simon Glass2a54d152013-05-19 16:45:35 -0700170uint64_t os_get_nsec(void);
Mike Frysinger4f345d52012-01-19 22:57:29 -0500171
Simon Glass70db4212012-02-15 15:51:16 -0800172/**
173 * Parse arguments and update sandbox state.
174 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100175 * @state: sandbox state to update
176 * @argc: argument count
177 * @argv: argument vector
178 * Return:
179 * * 0 if ok, and program should continue
180 * * 1 if ok, but program should stop
181 * * -1 on error: program should terminate
Simon Glass70db4212012-02-15 15:51:16 -0800182 */
183int os_parse_args(struct sandbox_state *state, int argc, char *argv[]);
184
Simon Glass62584db2012-12-26 09:53:34 +0000185/*
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100186 * enum os_dirent_t - type of directory entry
187 *
Simon Glass62584db2012-12-26 09:53:34 +0000188 * Types of directory entry that we support. See also os_dirent_typename in
189 * the C file.
190 */
191enum os_dirent_t {
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100192 /**
193 * @OS_FILET_REG: regular file
194 */
195 OS_FILET_REG,
196 /**
197 * @OS_FILET_LNK: symbolic link
198 */
199 OS_FILET_LNK,
200 /**
201 * @OS_FILET_DIR: directory
202 */
203 OS_FILET_DIR,
204 /**
205 * @OS_FILET_UNKNOWN: something else
206 */
207 OS_FILET_UNKNOWN,
208 /**
209 * @OS_FILET_COUNT: number of directory entry types
210 */
Simon Glass62584db2012-12-26 09:53:34 +0000211 OS_FILET_COUNT,
212};
213
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100214/**
215 * struct os_dirent_node - directory node
216 *
217 * A directory entry node, containing information about a single dirent
218 *
219 */
Simon Glass62584db2012-12-26 09:53:34 +0000220struct os_dirent_node {
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100221 /**
222 * @next: pointer to next node, or NULL
223 */
224 struct os_dirent_node *next;
225 /**
226 * @size: size of file in bytes
227 */
228 ulong size;
229 /**
230 * @type: type of entry
231 */
232 enum os_dirent_t type;
233 /**
234 * @name: name of entry
235 */
236 char name[0];
Simon Glass62584db2012-12-26 09:53:34 +0000237};
238
239/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100240 * os_dirent_ls() - get a directory listing
Simon Glass62584db2012-12-26 09:53:34 +0000241 *
242 * This allocates and returns a linked list containing the directory listing.
243 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100244 * @dirname: directory to examine
245 * @headp: on return pointer to head of linked list, or NULL if none
246 * Return: 0 if ok, -ve on error
Simon Glass62584db2012-12-26 09:53:34 +0000247 */
248int os_dirent_ls(const char *dirname, struct os_dirent_node **headp);
249
250/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100251 * os_dirent_free() - free directory list
Stefan Brüns86167082016-10-01 20:41:38 +0200252 *
253 * This frees a linked list containing a directory listing.
254 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100255 * @node: pointer to head of linked list
Stefan Brüns86167082016-10-01 20:41:38 +0200256 */
257void os_dirent_free(struct os_dirent_node *node);
258
259/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100260 * os_dirent_get_typename() - get the name of a directory entry type
Simon Glass62584db2012-12-26 09:53:34 +0000261 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100262 * @type: type to check
263 * Return:
264 * string containing the name of that type,
265 * or "???" if none/invalid
Simon Glass62584db2012-12-26 09:53:34 +0000266 */
267const char *os_dirent_get_typename(enum os_dirent_t type);
268
269/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100270 * os_get_filesize() - get the size of a file
Simon Glass62584db2012-12-26 09:53:34 +0000271 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100272 * @fname: filename to check
273 * @size: size of file is returned if no error
274 * Return: 0 on success or -1 if an error ocurred
Simon Glass62584db2012-12-26 09:53:34 +0000275 */
Heinrich Schuchardt880dbc52022-01-11 01:50:24 +0100276int os_get_filesize(const char *fname, long long *size);
Simon Glass62584db2012-12-26 09:53:34 +0000277
Simon Glass91b136c2013-11-10 10:27:01 -0700278/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100279 * os_putc() - write a character to the controlling OS terminal
Simon Glass0b189b62017-12-04 13:48:17 -0700280 *
281 * This bypasses the U-Boot console support and writes directly to the OS
282 * stdout file descriptor.
283 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100284 * @ch: haracter to write
Simon Glass0b189b62017-12-04 13:48:17 -0700285 */
286void os_putc(int ch);
287
288/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100289 * os_puts() - write a string to the controlling OS terminal
Simon Glass0b189b62017-12-04 13:48:17 -0700290 *
291 * This bypasses the U-Boot console support and writes directly to the OS
292 * stdout file descriptor.
293 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100294 * @str: string to write (note that \n is not appended)
Simon Glass0b189b62017-12-04 13:48:17 -0700295 */
296void os_puts(const char *str);
297
298/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100299 * os_write_ram_buf() - write the sandbox RAM buffer to a existing file
Simon Glass5c2859c2013-11-10 10:27:03 -0700300 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100301 * @fname: filename to write memory to (simple binary format)
302 * Return: 0 if OK, -ve on error
Simon Glass5c2859c2013-11-10 10:27:03 -0700303 */
304int os_write_ram_buf(const char *fname);
305
306/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100307 * os_read_ram_buf() - read the sandbox RAM buffer from an existing file
Simon Glass5c2859c2013-11-10 10:27:03 -0700308 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100309 * @fname: filename containing memory (simple binary format)
310 * Return: 0 if OK, -ve on error
Simon Glass5c2859c2013-11-10 10:27:03 -0700311 */
312int os_read_ram_buf(const char *fname);
313
Simon Glass47f5fcf2014-02-27 13:26:15 -0700314/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100315 * os_jump_to_image() - jump to a new executable image
Simon Glass47f5fcf2014-02-27 13:26:15 -0700316 *
317 * This uses exec() to run a new executable image, after putting it in a
318 * temporary file. The same arguments and environment are passed to this
319 * new image, with the addition of:
320 *
321 * -j <filename> Specifies the filename the image was written to. The
322 * calling image may want to delete this at some point.
323 * -m <filename> Specifies the file containing the sandbox memory
324 * (ram_buf) from this image, so that the new image can
325 * have access to this. It also means that the original
326 * memory filename passed to U-Boot will be left intact.
327 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100328 * @dest: buffer containing executable image
329 * @size: size of buffer
330 * Return: 0 if OK, -ve on error
Simon Glass47f5fcf2014-02-27 13:26:15 -0700331 */
332int os_jump_to_image(const void *dest, int size);
333
Simon Glass94eefde2015-04-20 12:37:22 -0600334/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100335 * os_find_u_boot() - determine the path to U-Boot proper
Simon Glassd4e33f52016-07-04 11:57:45 -0600336 *
337 * This function is intended to be called from within sandbox SPL. It uses
338 * a few heuristics to find U-Boot proper. Normally it is either in the same
339 * directory, or the directory above (since u-boot-spl is normally in an
340 * spl/ subdirectory when built).
341 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100342 * @fname: place to put full path to U-Boot
343 * @maxlen: maximum size of @fname
Simon Glass01ad9f72021-03-07 17:35:13 -0700344 * @use_img: select the 'u-boot.img' file instead of the 'u-boot' ELF file
Simon Glassf178beb2021-07-05 16:32:45 -0600345 * @cur_prefix: prefix of current executable, e.g. "spl" or "tpl"
346 * @next_prefix: prefix of executable to find, e.g. "spl" or ""
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100347 * Return: 0 if OK, -NOSPC if the filename is too large, -ENOENT if not found
Simon Glassd4e33f52016-07-04 11:57:45 -0600348 */
Simon Glassf178beb2021-07-05 16:32:45 -0600349int os_find_u_boot(char *fname, int maxlen, bool use_img,
350 const char *cur_prefix, const char *next_prefix);
Simon Glassd4e33f52016-07-04 11:57:45 -0600351
352/**
353 * os_spl_to_uboot() - Run U-Boot proper
354 *
355 * When called from SPL, this runs U-Boot proper. The filename is obtained by
356 * calling os_find_u_boot().
357 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100358 * @fname: full pathname to U-Boot executable
359 * Return: 0 if OK, -ve on error
Simon Glassd4e33f52016-07-04 11:57:45 -0600360 */
361int os_spl_to_uboot(const char *fname);
362
363/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100364 * os_localtime() - read the current system time
Simon Glass94eefde2015-04-20 12:37:22 -0600365 *
366 * This reads the current Local Time and places it into the provided
367 * structure.
368 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100369 * @rt: place to put system time
Simon Glass94eefde2015-04-20 12:37:22 -0600370 */
371void os_localtime(struct rtc_time *rt);
372
Simon Glass30eef212018-05-16 09:42:22 -0600373/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100374 * os_abort() - raise SIGABRT to exit sandbox (e.g. to debugger)
Simon Glassfe938fb2018-09-15 00:50:55 -0600375 */
Heinrich Schuchardtc30a7092021-02-01 01:24:10 +0100376void os_abort(void) __attribute__((noreturn));
Simon Glass9f8037e2018-10-01 21:12:32 -0600377
378/**
379 * os_mprotect_allow() - Remove write-protection on a region of memory
380 *
381 * The start and length will be page-aligned before use.
382 *
383 * @start: Region start
384 * @len: Region length in bytes
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100385 * Return: 0 if OK, -1 on error from mprotect()
Simon Glass9f8037e2018-10-01 21:12:32 -0600386 */
387int os_mprotect_allow(void *start, size_t len);
388
Simon Glass056a5ce2018-10-01 11:55:08 -0600389/**
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100390 * os_write_file() - write a file to the host filesystem
Simon Glass056a5ce2018-10-01 11:55:08 -0600391 *
392 * This can be useful when debugging for writing data out of sandbox for
393 * inspection by external tools.
394 *
395 * @name: File path to write to
396 * @buf: Data to write
397 * @size: Size of data to write
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100398 * Return: 0 if OK, -ve on error
Simon Glass056a5ce2018-10-01 11:55:08 -0600399 */
400int os_write_file(const char *name, const void *buf, int size);
401
Simon Glass566bf3a2018-11-06 15:21:25 -0700402/**
403 * os_read_file() - Read a file from the host filesystem
404 *
405 * This can be useful when reading test data into sandbox for use by test
406 * routines. The data is allocated using os_malloc() and should be freed by
407 * the caller.
408 *
409 * @name: File path to read from
410 * @bufp: Returns buffer containing data read
411 * @sizep: Returns size of data
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100412 * Return: 0 if OK, -ve on error
Simon Glass566bf3a2018-11-06 15:21:25 -0700413 */
414int os_read_file(const char *name, void **bufp, int *sizep);
415
Simon Glassb9274092021-08-18 21:40:31 -0600416/**
417 * os_map_file() - Map a file from the host filesystem into memory
418 *
419 * This can be useful when to provide a backing store for an emulated device
420 *
421 * @pathname: File pathname to map
422 * @os_flags: Flags, like OS_O_RDONLY, OS_O_RDWR
423 * @bufp: Returns buffer containing the file
424 * @sizep: Returns size of data
425 * Return: 0 if OK, -ve on error
426 */
427int os_map_file(const char *pathname, int os_flags, void **bufp, int *sizep);
428
Simon Glassa0ff2802021-10-23 17:25:58 -0600429/**
430 * os_unmap() - Unmap a file previously mapped
431 *
432 * @buf: Mapped address
433 * @size: Size in bytes
434 * Return: 0 if OK, -ve on error
435 */
436int os_unmap(void *buf, int size);
437
Simon Glass001d1882019-04-08 13:20:41 -0600438/*
439 * os_find_text_base() - Find the text section in this running process
440 *
441 * This tries to find the address of the text section in this running process.
442 * It can be useful to map the address of functions to the address listed in
443 * the u-boot.map file.
444 *
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100445 * Return: address if found, else NULL
Simon Glass001d1882019-04-08 13:20:41 -0600446 */
447void *os_find_text_base(void);
448
Heinrich Schuchardt329dccc2020-10-27 20:29:25 +0100449/**
450 * os_relaunch() - restart the sandbox
451 *
452 * This functions is used to implement the cold reboot of the sand box.
Heinrich Schuchardt063790c2020-10-27 20:29:27 +0100453 * @argv\[0] specifies the binary that is started while the calling process
Heinrich Schuchardt329dccc2020-10-27 20:29:25 +0100454 * stops immediately. If the new binary cannot be started, the process is
455 * terminated and 1 is set as shell return code.
456 *
457 * The PID of the process stays the same. All file descriptors that have not
458 * been opened with O_CLOEXEC stay open including stdin, stdout, stderr.
459 *
460 * @argv: NULL terminated list of command line parameters
461 */
462void os_relaunch(char *argv[]);
463
Heinrich Schuchardtb46f30a2020-11-12 00:29:56 +0100464/**
465 * os_setup_signal_handlers() - setup signal handlers
466 *
467 * Install signal handlers for SIGBUS and SIGSEGV.
468 *
469 * Return: 0 for success
470 */
471int os_setup_signal_handlers(void);
472
473/**
474 * os_signal_action() - handle a signal
475 *
476 * @sig: signal
477 * @pc: program counter
478 */
479void os_signal_action(int sig, unsigned long pc);
480
Heinrich Schuchardt43db0752020-12-30 18:07:48 +0100481/**
482 * os_get_time_offset() - get time offset
483 *
484 * Get the time offset from environment variable UBOOT_SB_TIME_OFFSET.
485 *
486 * Return: offset in seconds
487 */
488long os_get_time_offset(void);
489
490/**
491 * os_set_time_offset() - set time offset
492 *
493 * Save the time offset in environment variable UBOOT_SB_TIME_OFFSET.
494 *
495 * @offset: offset in seconds
496 */
497void os_set_time_offset(long offset);
498
Mike Frysinger4f345d52012-01-19 22:57:29 -0500499#endif