| | 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__ */ |
projects / linux-2.6-block.git / blame_incremental