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Diffstat (limited to 'include/os.h')
-rw-r--r-- | include/os.h | 378 |
1 files changed, 378 insertions, 0 deletions
diff --git a/include/os.h b/include/os.h new file mode 100644 index 0000000..7a4f78b --- /dev/null +++ b/include/os.h @@ -0,0 +1,378 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Operating System Interface + * + * This provides access to useful OS routines for the sandbox architecture. + * They are kept in a separate file so we can include system headers. + * + * Copyright (c) 2011 The Chromium OS Authors. + */ + +#ifndef __OS_H__ +#define __OS_H__ + +#include <linux/types.h> + +struct rtc_time; +struct sandbox_state; + +/** + * Access to the OS read() system call + * + * \param fd File descriptor as returned by os_open() + * \param buf Buffer to place data + * \param count Number of bytes to read + * \return number of bytes read, or -1 on error + */ +ssize_t os_read(int fd, void *buf, size_t count); + +/** + * Access to the OS write() system call + * + * \param fd File descriptor as returned by os_open() + * \param buf Buffer containing data to write + * \param count Number of bytes to write + * \return number of bytes written, or -1 on error + */ +ssize_t os_write(int fd, const void *buf, size_t count); + +/** + * Access to the OS lseek() system call + * + * \param fd File descriptor as returned by os_open() + * \param offset File offset (based on whence) + * \param whence Position offset is relative to (see below) + * \return new file offset + */ +off_t os_lseek(int fd, off_t offset, int whence); + +/* Defines for "whence" in os_lseek() */ +#define OS_SEEK_SET 0 +#define OS_SEEK_CUR 1 +#define OS_SEEK_END 2 + +/** + * Access to the OS open() system call + * + * \param pathname Pathname of file to open + * \param flags Flags, like OS_O_RDONLY, OS_O_RDWR + * \return file descriptor, or -1 on error + */ +int os_open(const char *pathname, int flags); + +#define OS_O_RDONLY 0 +#define OS_O_WRONLY 1 +#define OS_O_RDWR 2 +#define OS_O_MASK 3 /* Mask for read/write flags */ +#define OS_O_CREAT 0100 +#define OS_O_TRUNC 01000 + +/** + * Access to the OS close() system call + * + * \param fd File descriptor to close + * \return 0 on success, -1 on error + */ +int os_close(int fd); + +/** + * Access to the OS unlink() system call + * + * \param pathname Path of file to delete + * \return 0 for success, other for error + */ +int os_unlink(const char *pathname); + +/** + * Access to the OS exit() system call + * + * This exits with the supplied return code, which should be 0 to indicate + * success. + * + * @param exit_code exit code for U-Boot + */ +void os_exit(int exit_code) __attribute__((noreturn)); + +/** + * Put tty into raw mode to mimic serial console better + * + * @param fd File descriptor of stdin (normally 0) + * @param allow_sigs Allow Ctrl-C, Ctrl-Z to generate signals rather than + * be handled by U-Boot + */ +void os_tty_raw(int fd, bool allow_sigs); + +/** + * Restore the tty to its original mode + * + * Call this to restore the original terminal mode, after it has been changed + * by os_tty_raw(). This is an internal function. + */ +void os_fd_restore(void); + +/** + * Acquires some memory from the underlying os. + * + * \param length Number of bytes to be allocated + * \return Pointer to length bytes or NULL on error + */ +void *os_malloc(size_t length); + +/** + * Free memory previous allocated with os_malloc()/os_realloc() + * + * This returns the memory to the OS. + * + * \param ptr Pointer to memory block to free + */ +void os_free(void *ptr); + +/** + * Reallocate previously-allocated memory to increase/decrease space + * + * This works in a similar way to the C library realloc() function. If + * length is 0, then ptr is freed. Otherwise the space used by ptr is + * expanded or reduced depending on whether length is larger or smaller + * than before. + * + * If ptr is NULL, then this is similar to calling os_malloc(). + * + * This function may need to move the memory block to make room for any + * extra space, in which case the new pointer is returned. + * + * \param ptr Pointer to memory block to reallocate + * \param length New length for memory block + * \return pointer to new memory block, or NULL on failure or if length + * is 0. + */ +void *os_realloc(void *ptr, size_t length); + +/** + * Access to the usleep function of the os + * + * \param usec Time to sleep in micro seconds + */ +void os_usleep(unsigned long usec); + +/** + * Gets a monotonic increasing number of nano seconds from the OS + * + * \return A monotonic increasing time scaled in nano seconds + */ +uint64_t os_get_nsec(void); + +/** + * Parse arguments and update sandbox state. + * + * @param state Sandbox state to update + * @param argc Argument count + * @param argv Argument vector + * @return 0 if ok, and program should continue; + * 1 if ok, but program should stop; + * -1 on error: program should terminate. + */ +int os_parse_args(struct sandbox_state *state, int argc, char *argv[]); + +/* + * Types of directory entry that we support. See also os_dirent_typename in + * the C file. + */ +enum os_dirent_t { + OS_FILET_REG, /* Regular file */ + OS_FILET_LNK, /* Symbolic link */ + OS_FILET_DIR, /* Directory */ + OS_FILET_UNKNOWN, /* Something else */ + + OS_FILET_COUNT, +}; + +/** A directory entry node, containing information about a single dirent */ +struct os_dirent_node { + struct os_dirent_node *next; /* Pointer to next node, or NULL */ + ulong size; /* Size of file in bytes */ + enum os_dirent_t type; /* Type of entry */ + char name[0]; /* Name of entry */ +}; + +/** + * Get a directionry listing + * + * This allocates and returns a linked list containing the directory listing. + * + * @param dirname Directory to examine + * @param headp Returns pointer to head of linked list, or NULL if none + * @return 0 if ok, -ve on error + */ +int os_dirent_ls(const char *dirname, struct os_dirent_node **headp); + +/** + * Free directory list + * + * This frees a linked list containing a directory listing. + * + * @param node Pointer to head of linked list + */ +void os_dirent_free(struct os_dirent_node *node); + +/** + * Get the name of a directory entry type + * + * @param type Type to check + * @return string containing the name of that type, or "???" if none/invalid + */ +const char *os_dirent_get_typename(enum os_dirent_t type); + +/** + * Get the size of a file + * + * @param fname Filename to check + * @param size size of file is returned if no error + * @return 0 on success or -1 if an error ocurred + */ +int os_get_filesize(const char *fname, loff_t *size); + +/** + * Write a character to the controlling OS terminal + * + * This bypasses the U-Boot console support and writes directly to the OS + * stdout file descriptor. + * + * @param ch Character to write + */ +void os_putc(int ch); + +/** + * Write a string to the controlling OS terminal + * + * This bypasses the U-Boot console support and writes directly to the OS + * stdout file descriptor. + * + * @param str String to write (note that \n is not appended) + */ +void os_puts(const char *str); + +/** + * Write the sandbox RAM buffer to a existing file + * + * @param fname Filename to write memory to (simple binary format) + * @return 0 if OK, -ve on error + */ +int os_write_ram_buf(const char *fname); + +/** + * Read the sandbox RAM buffer from an existing file + * + * @param fname Filename containing memory (simple binary format) + * @return 0 if OK, -ve on error + */ +int os_read_ram_buf(const char *fname); + +/** + * Jump to a new executable image + * + * This uses exec() to run a new executable image, after putting it in a + * temporary file. The same arguments and environment are passed to this + * new image, with the addition of: + * + * -j <filename> Specifies the filename the image was written to. The + * calling image may want to delete this at some point. + * -m <filename> Specifies the file containing the sandbox memory + * (ram_buf) from this image, so that the new image can + * have access to this. It also means that the original + * memory filename passed to U-Boot will be left intact. + * + * @param dest Buffer containing executable image + * @param size Size of buffer + */ +int os_jump_to_image(const void *dest, int size); + +/** + * os_find_u_boot() - Determine the path to U-Boot proper + * + * This function is intended to be called from within sandbox SPL. It uses + * a few heuristics to find U-Boot proper. Normally it is either in the same + * directory, or the directory above (since u-boot-spl is normally in an + * spl/ subdirectory when built). + * + * @fname: Place to put full path to U-Boot + * @maxlen: Maximum size of @fname + * @return 0 if OK, -NOSPC if the filename is too large, -ENOENT if not found + */ +int os_find_u_boot(char *fname, int maxlen); + +/** + * os_spl_to_uboot() - Run U-Boot proper + * + * When called from SPL, this runs U-Boot proper. The filename is obtained by + * calling os_find_u_boot(). + * + * @fname: Full pathname to U-Boot executable + * @return 0 if OK, -ve on error + */ +int os_spl_to_uboot(const char *fname); + +/** + * Read the current system time + * + * This reads the current Local Time and places it into the provided + * structure. + * + * @param rt Place to put system time + */ +void os_localtime(struct rtc_time *rt); + +/** + * os_abort() - Raise SIGABRT to exit sandbox (e.g. to debugger) + */ +void os_abort(void); + +/** + * os_mprotect_allow() - Remove write-protection on a region of memory + * + * The start and length will be page-aligned before use. + * + * @start: Region start + * @len: Region length in bytes + * @return 0 if OK, -1 on error from mprotect() + */ +int os_mprotect_allow(void *start, size_t len); + +/** + * os_write_file() - Write a file to the host filesystem + * + * This can be useful when debugging for writing data out of sandbox for + * inspection by external tools. + * + * @name: File path to write to + * @buf: Data to write + * @size: Size of data to write + * @return 0 if OK, -ve on error + */ +int os_write_file(const char *name, const void *buf, int size); + +/** + * os_read_file() - Read a file from the host filesystem + * + * This can be useful when reading test data into sandbox for use by test + * routines. The data is allocated using os_malloc() and should be freed by + * the caller. + * + * @name: File path to read from + * @bufp: Returns buffer containing data read + * @sizep: Returns size of data + * @return 0 if OK, -ve on error + */ +int os_read_file(const char *name, void **bufp, int *sizep); + +/* + * os_find_text_base() - Find the text section in this running process + * + * This tries to find the address of the text section in this running process. + * It can be useful to map the address of functions to the address listed in + * the u-boot.map file. + * + * @return address if found, else NULL + */ +void *os_find_text_base(void); + +#endif |