1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Operating System Interface
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.
8 * Copyright (c) 2011 The Chromium OS Authors.
14 #include <linux/types.h>
20 * Access to the OS read() system call
22 * @fd: File descriptor as returned by os_open()
23 * @buf: Buffer to place data
24 * @count: Number of bytes to read
25 * Return: number of bytes read, or -1 on error
27 ssize_t os_read(int fd, void *buf, size_t count);
30 * Access to the OS write() system call
32 * @fd: File descriptor as returned by os_open()
33 * @buf: Buffer containing data to write
34 * @count: Number of bytes to write
35 * Return: number of bytes written, or -1 on error
37 ssize_t os_write(int fd, const void *buf, size_t count);
40 * Access to the OS lseek() system call
42 * @fd: File descriptor as returned by os_open()
43 * @offset: File offset (based on whence)
44 * @whence: Position offset is relative to (see below)
45 * Return: new file offset
47 off_t os_lseek(int fd, off_t offset, int whence);
49 /* Defines for "whence" in os_lseek() */
55 * Access to the OS open() system call
57 * @pathname: Pathname of file to open
58 * @flags: Flags, like OS_O_RDONLY, OS_O_RDWR
59 * Return: file descriptor, or -1 on error
61 int os_open(const char *pathname, int flags);
66 #define OS_O_MASK 3 /* Mask for read/write flags */
67 #define OS_O_CREAT 0100
68 #define OS_O_TRUNC 01000
71 * os_close() - access to the OS close() system call
73 * @fd: File descriptor to close
74 * Return: 0 on success, -1 on error
79 * os_unlink() - access to the OS unlink() system call
81 * @pathname: Path of file to delete
82 * Return: 0 for success, other for error
84 int os_unlink(const char *pathname);
87 * os_exit() - access to the OS exit() system call
89 * This exits with the supplied return code, which should be 0 to indicate
92 * @exit_code: exit code for U-Boot
94 void os_exit(int exit_code) __attribute__((noreturn));
97 * os_tty_raw() - put tty into raw mode to mimic serial console better
99 * @fd: File descriptor of stdin (normally 0)
100 * @allow_sigs: Allow Ctrl-C, Ctrl-Z to generate signals rather than
101 * be handled by U-Boot
103 void os_tty_raw(int fd, bool allow_sigs);
106 * os_fs_restore() - restore the tty to its original mode
108 * Call this to restore the original terminal mode, after it has been changed
109 * by os_tty_raw(). This is an internal function.
111 void os_fd_restore(void);
114 * os_malloc() - aquires some memory from the underlying os.
116 * @length: Number of bytes to be allocated
117 * Return: Pointer to length bytes or NULL if @length is 0 or on error
119 void *os_malloc(size_t length);
122 * os_free() - free memory previous allocated with os_malloc()
124 * This returns the memory to the OS.
126 * @ptr: Pointer to memory block to free
128 void os_free(void *ptr);
131 * os_realloc() - reallocate memory
133 * This follows the semantics of realloc(), so can perform an os_malloc() or
134 * os_free() depending on @ptr and @length.
136 * Return: Pointer to reallocated memory or NULL if @length is 0
138 void *os_realloc(void *ptr, size_t length);
141 * os_usleep() - access to the usleep function of the os
143 * @usec: time to sleep in micro seconds
145 void os_usleep(unsigned long usec);
148 * Gets a monotonic increasing number of nano seconds from the OS
150 * Return: a monotonic increasing time scaled in nano seconds
152 uint64_t os_get_nsec(void);
155 * Parse arguments and update sandbox state.
157 * @state: sandbox state to update
158 * @argc: argument count
159 * @argv: argument vector
161 * * 0 if ok, and program should continue
162 * * 1 if ok, but program should stop
163 * * -1 on error: program should terminate
165 int os_parse_args(struct sandbox_state *state, int argc, char *argv[]);
168 * enum os_dirent_t - type of directory entry
170 * Types of directory entry that we support. See also os_dirent_typename in
175 * @OS_FILET_REG: regular file
179 * @OS_FILET_LNK: symbolic link
183 * @OS_FILET_DIR: directory
187 * @OS_FILET_UNKNOWN: something else
191 * @OS_FILET_COUNT: number of directory entry types
197 * struct os_dirent_node - directory node
199 * A directory entry node, containing information about a single dirent
202 struct os_dirent_node {
204 * @next: pointer to next node, or NULL
206 struct os_dirent_node *next;
208 * @size: size of file in bytes
212 * @type: type of entry
214 enum os_dirent_t type;
216 * @name: name of entry
222 * os_dirent_ls() - get a directory listing
224 * This allocates and returns a linked list containing the directory listing.
226 * @dirname: directory to examine
227 * @headp: on return pointer to head of linked list, or NULL if none
228 * Return: 0 if ok, -ve on error
230 int os_dirent_ls(const char *dirname, struct os_dirent_node **headp);
233 * os_dirent_free() - free directory list
235 * This frees a linked list containing a directory listing.
237 * @node: pointer to head of linked list
239 void os_dirent_free(struct os_dirent_node *node);
242 * os_dirent_get_typename() - get the name of a directory entry type
244 * @type: type to check
246 * string containing the name of that type,
247 * or "???" if none/invalid
249 const char *os_dirent_get_typename(enum os_dirent_t type);
252 * os_get_filesize() - get the size of a file
254 * @fname: filename to check
255 * @size: size of file is returned if no error
256 * Return: 0 on success or -1 if an error ocurred
258 int os_get_filesize(const char *fname, loff_t *size);
261 * os_putc() - write a character to the controlling OS terminal
263 * This bypasses the U-Boot console support and writes directly to the OS
264 * stdout file descriptor.
266 * @ch: haracter to write
268 void os_putc(int ch);
271 * os_puts() - write a string to the controlling OS terminal
273 * This bypasses the U-Boot console support and writes directly to the OS
274 * stdout file descriptor.
276 * @str: string to write (note that \n is not appended)
278 void os_puts(const char *str);
281 * os_write_ram_buf() - write the sandbox RAM buffer to a existing file
283 * @fname: filename to write memory to (simple binary format)
284 * Return: 0 if OK, -ve on error
286 int os_write_ram_buf(const char *fname);
289 * os_read_ram_buf() - read the sandbox RAM buffer from an existing file
291 * @fname: filename containing memory (simple binary format)
292 * Return: 0 if OK, -ve on error
294 int os_read_ram_buf(const char *fname);
297 * os_jump_to_image() - jump to a new executable image
299 * This uses exec() to run a new executable image, after putting it in a
300 * temporary file. The same arguments and environment are passed to this
301 * new image, with the addition of:
303 * -j <filename> Specifies the filename the image was written to. The
304 * calling image may want to delete this at some point.
305 * -m <filename> Specifies the file containing the sandbox memory
306 * (ram_buf) from this image, so that the new image can
307 * have access to this. It also means that the original
308 * memory filename passed to U-Boot will be left intact.
310 * @dest: buffer containing executable image
311 * @size: size of buffer
312 * Return: 0 if OK, -ve on error
314 int os_jump_to_image(const void *dest, int size);
317 * os_find_u_boot() - determine the path to U-Boot proper
319 * This function is intended to be called from within sandbox SPL. It uses
320 * a few heuristics to find U-Boot proper. Normally it is either in the same
321 * directory, or the directory above (since u-boot-spl is normally in an
322 * spl/ subdirectory when built).
324 * @fname: place to put full path to U-Boot
325 * @maxlen: maximum size of @fname
326 * Return: 0 if OK, -NOSPC if the filename is too large, -ENOENT if not found
328 int os_find_u_boot(char *fname, int maxlen);
331 * os_spl_to_uboot() - Run U-Boot proper
333 * When called from SPL, this runs U-Boot proper. The filename is obtained by
334 * calling os_find_u_boot().
336 * @fname: full pathname to U-Boot executable
337 * Return: 0 if OK, -ve on error
339 int os_spl_to_uboot(const char *fname);
342 * os_localtime() - read the current system time
344 * This reads the current Local Time and places it into the provided
347 * @rt: place to put system time
349 void os_localtime(struct rtc_time *rt);
352 * os_abort() - raise SIGABRT to exit sandbox (e.g. to debugger)
354 void os_abort(void) __attribute__((noreturn));
357 * os_mprotect_allow() - Remove write-protection on a region of memory
359 * The start and length will be page-aligned before use.
361 * @start: Region start
362 * @len: Region length in bytes
363 * Return: 0 if OK, -1 on error from mprotect()
365 int os_mprotect_allow(void *start, size_t len);
368 * os_write_file() - write a file to the host filesystem
370 * This can be useful when debugging for writing data out of sandbox for
371 * inspection by external tools.
373 * @name: File path to write to
374 * @buf: Data to write
375 * @size: Size of data to write
376 * Return: 0 if OK, -ve on error
378 int os_write_file(const char *name, const void *buf, int size);
381 * os_read_file() - Read a file from the host filesystem
383 * This can be useful when reading test data into sandbox for use by test
384 * routines. The data is allocated using os_malloc() and should be freed by
387 * @name: File path to read from
388 * @bufp: Returns buffer containing data read
389 * @sizep: Returns size of data
390 * Return: 0 if OK, -ve on error
392 int os_read_file(const char *name, void **bufp, int *sizep);
395 * os_find_text_base() - Find the text section in this running process
397 * This tries to find the address of the text section in this running process.
398 * It can be useful to map the address of functions to the address listed in
399 * the u-boot.map file.
401 * Return: address if found, else NULL
403 void *os_find_text_base(void);
406 * os_relaunch() - restart the sandbox
408 * This functions is used to implement the cold reboot of the sand box.
409 * @argv\[0] specifies the binary that is started while the calling process
410 * stops immediately. If the new binary cannot be started, the process is
411 * terminated and 1 is set as shell return code.
413 * The PID of the process stays the same. All file descriptors that have not
414 * been opened with O_CLOEXEC stay open including stdin, stdout, stderr.
416 * @argv: NULL terminated list of command line parameters
418 void os_relaunch(char *argv[]);
421 * os_setup_signal_handlers() - setup signal handlers
423 * Install signal handlers for SIGBUS and SIGSEGV.
425 * Return: 0 for success
427 int os_setup_signal_handlers(void);
430 * os_signal_action() - handle a signal
433 * @pc: program counter
435 void os_signal_action(int sig, unsigned long pc);
438 * os_get_time_offset() - get time offset
440 * Get the time offset from environment variable UBOOT_SB_TIME_OFFSET.
442 * Return: offset in seconds
444 long os_get_time_offset(void);
447 * os_set_time_offset() - set time offset
449 * Save the time offset in environment variable UBOOT_SB_TIME_OFFSET.
451 * @offset: offset in seconds
453 void os_set_time_offset(long offset);