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1 | /* | |
2 | * This program is free software; you can redistribute it and/or modify | |
3 | * it under the terms of the GNU General Public License as published by | |
4 | * the Free Software Foundation; either version 2 of the License. | |
5 | * | |
6 | * This program is distributed in the hope that it will be useful, | |
7 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9 | * GNU General Public License for more details. | |
10 | * | |
11 | * You should have received a copy of the GNU General Public License | |
12 | * along with this program; if not, write to the Free Software | |
13 | * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
14 | */ | |
15 | ||
16 | #ifndef __KVM_IODEV_H__ | |
17 | #define __KVM_IODEV_H__ | |
18 | ||
19 | #include <linux/kvm_types.h> | |
20 | #include <asm/errno.h> | |
21 | ||
22 | struct kvm_io_device; | |
23 | ||
24 | /** | |
25 | * kvm_io_device_ops are called under kvm slots_lock. | |
26 | * read and write handlers return 0 if the transaction has been handled, | |
27 | * or non-zero to have it passed to the next device. | |
28 | **/ | |
29 | struct kvm_io_device_ops { | |
30 | int (*read)(struct kvm_io_device *this, | |
31 | gpa_t addr, | |
32 | int len, | |
33 | void *val); | |
34 | int (*write)(struct kvm_io_device *this, | |
35 | gpa_t addr, | |
36 | int len, | |
37 | const void *val); | |
38 | void (*destructor)(struct kvm_io_device *this); | |
39 | }; | |
40 | ||
41 | ||
42 | struct kvm_io_device { | |
43 | const struct kvm_io_device_ops *ops; | |
44 | }; | |
45 | ||
46 | static inline void kvm_iodevice_init(struct kvm_io_device *dev, | |
47 | const struct kvm_io_device_ops *ops) | |
48 | { | |
49 | dev->ops = ops; | |
50 | } | |
51 | ||
52 | static inline int kvm_iodevice_read(struct kvm_io_device *dev, | |
53 | gpa_t addr, int l, void *v) | |
54 | { | |
55 | return dev->ops->read ? dev->ops->read(dev, addr, l, v) : -EOPNOTSUPP; | |
56 | } | |
57 | ||
58 | static inline int kvm_iodevice_write(struct kvm_io_device *dev, | |
59 | gpa_t addr, int l, const void *v) | |
60 | { | |
61 | return dev->ops->write ? dev->ops->write(dev, addr, l, v) : -EOPNOTSUPP; | |
62 | } | |
63 | ||
64 | static inline void kvm_iodevice_destructor(struct kvm_io_device *dev) | |
65 | { | |
66 | if (dev->ops->destructor) | |
67 | dev->ops->destructor(dev); | |
68 | } | |
69 | ||
70 | #endif /* __KVM_IODEV_H__ */ |