cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

hvc_console.h (3303B)

      1/* SPDX-License-Identifier: GPL-2.0+ */
      2/*
      3 * hvc_console.h
      4 * Copyright (C) 2005 IBM Corporation
      5 *
      6 * Author(s):
      7 * 	Ryan S. Arnold <rsa@us.ibm.com>
      8 *
      9 * hvc_console header information:
     10 *      moved here from arch/powerpc/include/asm/hvconsole.h
     11 *      and drivers/char/hvc_console.c
     12 */
     13
     14#ifndef HVC_CONSOLE_H
     15#define HVC_CONSOLE_H
     16#include <linux/kref.h>
     17#include <linux/tty.h>
     18#include <linux/spinlock.h>
     19
     20/*
     21 * This is the max number of console adapters that can/will be found as
     22 * console devices on first stage console init.  Any number beyond this range
     23 * can't be used as a console device but is still a valid tty device.
     24 */
     25#define MAX_NR_HVC_CONSOLES	16
     26
     27/*
     28 * The Linux TTY code does not support dynamic addition of tty derived devices
     29 * so we need to know how many tty devices we might need when space is allocated
     30 * for the tty device.  Since this driver supports hotplug of vty adapters we
     31 * need to make sure we have enough allocated.
     32 */
     33#define HVC_ALLOC_TTY_ADAPTERS	8
     34
     35struct hvc_struct {
     36	struct tty_port port;
     37	spinlock_t lock;
     38	int index;
     39	int do_wakeup;
     40	char *outbuf;
     41	int outbuf_size;
     42	int n_outbuf;
     43	uint32_t vtermno;
     44	const struct hv_ops *ops;
     45	int irq_requested;
     46	int data;
     47	struct winsize ws;
     48	struct work_struct tty_resize;
     49	struct list_head next;
     50	unsigned long flags;
     51};
     52
     53/* implemented by a low level driver */
     54struct hv_ops {
     55	int (*get_chars)(uint32_t vtermno, char *buf, int count);
     56	int (*put_chars)(uint32_t vtermno, const char *buf, int count);
     57	int (*flush)(uint32_t vtermno, bool wait);
     58
     59	/* Callbacks for notification. Called in open, close and hangup */
     60	int (*notifier_add)(struct hvc_struct *hp, int irq);
     61	void (*notifier_del)(struct hvc_struct *hp, int irq);
     62	void (*notifier_hangup)(struct hvc_struct *hp, int irq);
     63
     64	/* tiocmget/set implementation */
     65	int (*tiocmget)(struct hvc_struct *hp);
     66	int (*tiocmset)(struct hvc_struct *hp, unsigned int set, unsigned int clear);
     67
     68	/* Callbacks to handle tty ports */
     69	void (*dtr_rts)(struct hvc_struct *hp, int raise);
     70};
     71
     72/* Register a vterm and a slot index for use as a console (console_init) */
     73extern int hvc_instantiate(uint32_t vtermno, int index,
     74			   const struct hv_ops *ops);
     75
     76/* register a vterm for hvc tty operation (module_init or hotplug add) */
     77extern struct hvc_struct * hvc_alloc(uint32_t vtermno, int data,
     78				     const struct hv_ops *ops, int outbuf_size);
     79/* remove a vterm from hvc tty operation (module_exit or hotplug remove) */
     80extern int hvc_remove(struct hvc_struct *hp);
     81
     82/* data available */
     83int hvc_poll(struct hvc_struct *hp);
     84void hvc_kick(void);
     85
     86/* Resize hvc tty terminal window */
     87extern void __hvc_resize(struct hvc_struct *hp, struct winsize ws);
     88
     89static inline void hvc_resize(struct hvc_struct *hp, struct winsize ws)
     90{
     91	unsigned long flags;
     92
     93	spin_lock_irqsave(&hp->lock, flags);
     94	__hvc_resize(hp, ws);
     95	spin_unlock_irqrestore(&hp->lock, flags);
     96}
     97
     98/* default notifier for irq based notification */
     99extern int notifier_add_irq(struct hvc_struct *hp, int data);
    100extern void notifier_del_irq(struct hvc_struct *hp, int data);
    101extern void notifier_hangup_irq(struct hvc_struct *hp, int data);
    102
    103
    104#if defined(CONFIG_XMON) && defined(CONFIG_SMP)
    105#include <asm/xmon.h>
    106#else
    107static inline int cpus_are_in_xmon(void)
    108{
    109	return 0;
    110}
    111#endif
    112
    113#endif // HVC_CONSOLE_H