* Copyright (C) 2005 IBM Corporation
* Ryan S. Arnold <rsa@us.ibm.com>
* hvc_console header information:
* moved here from arch/powerpc/include/asm/hvconsole.h
* and drivers/char/hvc_console.c
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include <linux/spinlock.h>
* This is the max number of console adapters that can/will be found as
* console devices on first stage console init. Any number beyond this range
* can't be used as a console device but is still a valid tty device.
#define MAX_NR_HVC_CONSOLES 16
* The Linux TTY code does not support dynamic addition of tty derived devices
* so we need to know how many tty devices we might need when space is allocated
* for the tty device. Since this driver supports hotplug of vty adapters we
* need to make sure we have enough allocated.
#define HVC_ALLOC_TTY_ADAPTERS 8
const struct hv_ops
*ops
;
struct work_struct tty_resize
;
struct kref kref
; /* ref count & hvc_struct lifetime */
/* implemented by a low level driver */
int (*get_chars
)(uint32_t vtermno
, char *buf
, int count
);
int (*put_chars
)(uint32_t vtermno
, const char *buf
, int count
);
/* Callbacks for notification. Called in open, close and hangup */
int (*notifier_add
)(struct hvc_struct
*hp
, int irq
);
void (*notifier_del
)(struct hvc_struct
*hp
, int irq
);
void (*notifier_hangup
)(struct hvc_struct
*hp
, int irq
);
/* Register a vterm and a slot index for use as a console (console_init) */
extern int hvc_instantiate(uint32_t vtermno
, int index
,
const struct hv_ops
*ops
);
/* register a vterm for hvc tty operation (module_init or hotplug add) */
extern struct hvc_struct
* hvc_alloc(uint32_t vtermno
, int data
,
const struct hv_ops
*ops
, int outbuf_size
);
/* remove a vterm from hvc tty operation (module_exit or hotplug remove) */
extern int hvc_remove(struct hvc_struct
*hp
);
int hvc_poll(struct hvc_struct
*hp
);
/* Resize hvc tty terminal window */
extern void __hvc_resize(struct hvc_struct
*hp
, struct winsize ws
);
static inline void hvc_resize(struct hvc_struct
*hp
, struct winsize ws
)
spin_lock_irqsave(&hp
->lock
, flags
);
spin_unlock_irqrestore(&hp
->lock
, flags
);
/* default notifier for irq based notification */
extern int notifier_add_irq(struct hvc_struct
*hp
, int data
);
extern void notifier_del_irq(struct hvc_struct
*hp
, int data
);
extern void notifier_hangup_irq(struct hvc_struct
*hp
, int data
);
#if defined(CONFIG_XMON) && defined(CONFIG_SMP)
static inline int cpus_are_in_xmon(void)