/* * hvc_console.h * Copyright (C) 2005 IBM Corporation * * Author(s): * 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 */ #ifndef HVC_CONSOLE_H #define HVC_CONSOLE_H #include <linux/kref.h> #include <linux/tty.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 struct hvc_struct { spinlock_t lock; int index; struct tty_struct *tty; unsigned int count; int do_wakeup; char *outbuf; int outbuf_size; int n_outbuf; uint32_t vtermno; struct hv_ops *ops; int irq_requested; int data; struct winsize ws; struct work_struct tty_resize; struct list_head next; struct kref kref; /* ref count & hvc_struct lifetime */ }; /* implemented by a low level driver */ struct hv_ops { 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, struct hv_ops *ops); /* register a vterm for hvc tty operation (module_init or hotplug add) */ extern struct hvc_struct * __devinit hvc_alloc(uint32_t vtermno, int data, 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); /* data available */ int hvc_poll(struct hvc_struct *hp); void hvc_kick(void); /* Resize hvc tty terminal window */ extern void hvc_resize(struct hvc_struct *hp, struct winsize ws); /* 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) #include <asm/xmon.h> #else static inline int cpus_are_in_xmon(void) { return 0; } #endif #endif // HVC_CONSOLE_H