include/os.h - filogic/uboot - Gitiles

 /*
  * 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.
  * SPDX-License-Identifier:	GPL-2.0+
  */

 #ifndef __OS_H__
 #define __OS_H__

 #include <linux/types.h>

 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 read() system call with non-blocking access
  *
  * \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_no_block(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 O_RDONLY, 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

 /**
  * 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
  */
 void os_tty_raw(int fd);

 /**
  * 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);

 /**
  * Get the name of a directory entry type
  *
  * @param type		Type to cehck
  * @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
  * @return size of file, or -1 if an error ocurred
  */
 ssize_t os_get_filesize(const char *fname);

 /**
  * 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);

 #endif
	/*
	* 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.
	* SPDX-License-Identifier: GPL-2.0+
	*/

	#ifndef __OS_H__
	#define __OS_H__

	#include <linux/types.h>

	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 read() system call with non-blocking access
	*
	* \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_no_block(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 O_RDONLY, 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

	/**
	* 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
	*/
	void os_tty_raw(int fd);

	/**
	* 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);

	/**
	* Get the name of a directory entry type
	*
	* @param type Type to cehck
	* @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
	* @return size of file, or -1 if an error ocurred
	*/
	ssize_t os_get_filesize(const char *fname);

	/**
	* 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);

	#endif