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1 | /* |
2 | * hvc_console.h |
3 | * Copyright (C) 2005 IBM Corporation |
4 | * |
5 | * Author(s): |
6 | * Ryan S. Arnold <rsa@us.ibm.com> |
7 | * |
8 | * hvc_console header information: |
9 | * moved here from arch/powerpc/include/asm/hvconsole.h |
10 | * and drivers/char/hvc_console.c |
11 | * |
12 | * This program is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU General Public License as published by |
14 | * the Free Software Foundation; either version 2 of the License, or |
15 | * (at your option) any later version. |
16 | * |
17 | * This program is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU General Public License for more details. |
21 | * |
22 | * You should have received a copy of the GNU General Public License |
23 | * along with this program; if not, write to the Free Software |
24 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
25 | */ |
26 | |
27 | #ifndef HVC_CONSOLE_H |
28 | #define HVC_CONSOLE_H |
29 | #include <linux/kref.h> |
30 | #include <linux/tty.h> |
31 | #include <linux/spinlock.h> |
32 | |
33 | /* |
34 | * This is the max number of console adapters that can/will be found as |
35 | * console devices on first stage console init. Any number beyond this range |
36 | * can't be used as a console device but is still a valid tty device. |
37 | */ |
38 | #define MAX_NR_HVC_CONSOLES 16 |
39 | |
40 | /* |
41 | * The Linux TTY code does not support dynamic addition of tty derived devices |
42 | * so we need to know how many tty devices we might need when space is allocated |
43 | * for the tty device. Since this driver supports hotplug of vty adapters we |
44 | * need to make sure we have enough allocated. |
45 | */ |
46 | #define HVC_ALLOC_TTY_ADAPTERS 8 |
47 | |
48 | struct hvc_struct { |
49 | spinlock_t lock; |
50 | int index; |
51 | struct tty_struct *tty; |
52 | int count; |
53 | int do_wakeup; |
54 | char *outbuf; |
55 | int outbuf_size; |
56 | int n_outbuf; |
57 | uint32_t vtermno; |
58 | const struct hv_ops *ops; |
59 | int irq_requested; |
60 | int data; |
61 | struct winsize ws; |
62 | struct work_struct tty_resize; |
63 | struct list_head next; |
64 | struct kref kref; /* ref count & hvc_struct lifetime */ |
65 | }; |
66 | |
67 | /* implemented by a low level driver */ |
68 | struct hv_ops { |
69 | int (*get_chars)(uint32_t vtermno, char *buf, int count); |
70 | int (*put_chars)(uint32_t vtermno, const char *buf, int count); |
71 | |
72 | /* Callbacks for notification. Called in open, close and hangup */ |
73 | int (*notifier_add)(struct hvc_struct *hp, int irq); |
74 | void (*notifier_del)(struct hvc_struct *hp, int irq); |
75 | void (*notifier_hangup)(struct hvc_struct *hp, int irq); |
76 | }; |
77 | |
78 | /* Register a vterm and a slot index for use as a console (console_init) */ |
79 | extern int hvc_instantiate(uint32_t vtermno, int index, |
80 | const struct hv_ops *ops); |
81 | |
82 | /* register a vterm for hvc tty operation (module_init or hotplug add) */ |
83 | extern struct hvc_struct * hvc_alloc(uint32_t vtermno, int data, |
84 | const struct hv_ops *ops, int outbuf_size); |
85 | /* remove a vterm from hvc tty operation (module_exit or hotplug remove) */ |
86 | extern int hvc_remove(struct hvc_struct *hp); |
87 | |
88 | /* data available */ |
89 | int hvc_poll(struct hvc_struct *hp); |
90 | void hvc_kick(void); |
91 | |
92 | /* Resize hvc tty terminal window */ |
93 | extern void __hvc_resize(struct hvc_struct *hp, struct winsize ws); |
94 | |
95 | static inline void hvc_resize(struct hvc_struct *hp, struct winsize ws) |
96 | { |
97 | unsigned long flags; |
98 | |
99 | spin_lock_irqsave(&hp->lock, flags); |
100 | __hvc_resize(hp, ws); |
101 | spin_unlock_irqrestore(&hp->lock, flags); |
102 | } |
103 | |
104 | /* default notifier for irq based notification */ |
105 | extern int notifier_add_irq(struct hvc_struct *hp, int data); |
106 | extern void notifier_del_irq(struct hvc_struct *hp, int data); |
107 | extern void notifier_hangup_irq(struct hvc_struct *hp, int data); |
108 | |
109 | |
110 | #if defined(CONFIG_XMON) && defined(CONFIG_SMP) |
111 | #include <asm/xmon.h> |
112 | #else |
113 | static inline int cpus_are_in_xmon(void) |
114 | { |
115 | return 0; |
116 | } |
117 | #endif |
118 | |
119 | #endif // HVC_CONSOLE_H |
120 |
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