cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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tty.h (4141B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2/*
      3 * TTY core internal functions
      4 */
      5
      6#ifndef _TTY_INTERNAL_H
      7#define _TTY_INTERNAL_H
      8
      9#define tty_msg(fn, tty, f, ...) \
     10	fn("%s %s: " f, tty_driver_name(tty), tty_name(tty), ##__VA_ARGS__)
     11
     12#define tty_debug(tty, f, ...)	tty_msg(pr_debug, tty, f, ##__VA_ARGS__)
     13#define tty_notice(tty, f, ...)	tty_msg(pr_notice, tty, f, ##__VA_ARGS__)
     14#define tty_warn(tty, f, ...)	tty_msg(pr_warn, tty, f, ##__VA_ARGS__)
     15#define tty_err(tty, f, ...)	tty_msg(pr_err, tty, f, ##__VA_ARGS__)
     16
     17#define tty_info_ratelimited(tty, f, ...) \
     18		tty_msg(pr_info_ratelimited, tty, f, ##__VA_ARGS__)
     19
     20/*
     21 * Lock subclasses for tty locks
     22 *
     23 * TTY_LOCK_NORMAL is for normal ttys and master ptys.
     24 * TTY_LOCK_SLAVE is for slave ptys only.
     25 *
     26 * Lock subclasses are necessary for handling nested locking with pty pairs.
     27 * tty locks which use nested locking:
     28 *
     29 * legacy_mutex - Nested tty locks are necessary for releasing pty pairs.
     30 *		  The stable lock order is master pty first, then slave pty.
     31 * termios_rwsem - The stable lock order is tty_buffer lock->termios_rwsem.
     32 *		   Subclassing this lock enables the slave pty to hold its
     33 *		   termios_rwsem when claiming the master tty_buffer lock.
     34 * tty_buffer lock - slave ptys can claim nested buffer lock when handling
     35 *		     signal chars. The stable lock order is slave pty, then
     36 *		     master.
     37 */
     38enum {
     39	TTY_LOCK_NORMAL = 0,
     40	TTY_LOCK_SLAVE,
     41};
     42
     43/* Values for tty->flow_change */
     44#define TTY_THROTTLE_SAFE	1
     45#define TTY_UNTHROTTLE_SAFE	2
     46
     47static inline void __tty_set_flow_change(struct tty_struct *tty, int val)
     48{
     49	tty->flow_change = val;
     50}
     51
     52static inline void tty_set_flow_change(struct tty_struct *tty, int val)
     53{
     54	tty->flow_change = val;
     55	smp_mb();
     56}
     57
     58int tty_ldisc_lock(struct tty_struct *tty, unsigned long timeout);
     59void tty_ldisc_unlock(struct tty_struct *tty);
     60
     61int __tty_check_change(struct tty_struct *tty, int sig);
     62int tty_check_change(struct tty_struct *tty);
     63void __stop_tty(struct tty_struct *tty);
     64void __start_tty(struct tty_struct *tty);
     65void tty_vhangup_session(struct tty_struct *tty);
     66void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty);
     67int tty_signal_session_leader(struct tty_struct *tty, int exit_session);
     68void session_clear_tty(struct pid *session);
     69void tty_buffer_free_all(struct tty_port *port);
     70void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
     71void tty_buffer_init(struct tty_port *port);
     72void tty_buffer_set_lock_subclass(struct tty_port *port);
     73bool tty_buffer_restart_work(struct tty_port *port);
     74bool tty_buffer_cancel_work(struct tty_port *port);
     75void tty_buffer_flush_work(struct tty_port *port);
     76speed_t tty_termios_input_baud_rate(struct ktermios *termios);
     77void tty_ldisc_hangup(struct tty_struct *tty, bool reset);
     78int tty_ldisc_reinit(struct tty_struct *tty, int disc);
     79long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
     80long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty,
     81		       struct file *file, unsigned int cmd, unsigned long arg);
     82void tty_default_fops(struct file_operations *fops);
     83struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx);
     84int tty_alloc_file(struct file *file);
     85void tty_add_file(struct tty_struct *tty, struct file *file);
     86void tty_free_file(struct file *file);
     87int tty_release(struct inode *inode, struct file *filp);
     88
     89#define tty_is_writelocked(tty)  (mutex_is_locked(&tty->atomic_write_lock))
     90
     91int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
     92void tty_ldisc_release(struct tty_struct *tty);
     93int __must_check tty_ldisc_init(struct tty_struct *tty);
     94void tty_ldisc_deinit(struct tty_struct *tty);
     95
     96void tty_sysctl_init(void);
     97
     98/* tty_audit.c */
     99#ifdef CONFIG_AUDIT
    100void tty_audit_add_data(struct tty_struct *tty, const void *data, size_t size);
    101void tty_audit_tiocsti(struct tty_struct *tty, char ch);
    102#else
    103static inline void tty_audit_add_data(struct tty_struct *tty, const void *data,
    104				      size_t size)
    105{
    106}
    107static inline void tty_audit_tiocsti(struct tty_struct *tty, char ch)
    108{
    109}
    110#endif
    111
    112ssize_t redirected_tty_write(struct kiocb *, struct iov_iter *);
    113
    114#endif