2 * Virtio Accessor Support: In case your target can change endian.
4 * Copyright IBM, Corp. 2013
7 * Rusty Russell <rusty@au.ibm.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation, either version 2 of the License, or
12 * (at your option) any later version.
15 #ifndef _QEMU_VIRTIO_ACCESS_H
16 #define _QEMU_VIRTIO_ACCESS_H
17 #include "hw/virtio/virtio.h"
18 #include "exec/address-spaces.h"
20 static inline bool virtio_access_is_big_endian(VirtIODevice *vdev)
22 if (virtio_has_feature(vdev, VIRTIO_F_VERSION_1)) {
23 /* Devices conforming to VIRTIO 1.0 or later are always LE. */
26 #if defined(TARGET_IS_BIENDIAN)
27 return virtio_is_big_endian(vdev);
28 #elif defined(TARGET_WORDS_BIGENDIAN)
35 static inline bool virtio_legacy_is_cross_endian(VirtIODevice *vdev)
37 #ifdef TARGET_IS_BIENDIAN
38 #ifdef HOST_WORDS_BIGENDIAN
39 return !virtio_is_big_endian(vdev);
41 return virtio_is_big_endian(vdev);
48 static inline uint16_t virtio_lduw_phys(VirtIODevice *vdev, hwaddr pa)
50 if (virtio_access_is_big_endian(vdev)) {
51 return lduw_be_phys(&address_space_memory, pa);
53 return lduw_le_phys(&address_space_memory, pa);
56 static inline uint32_t virtio_ldl_phys(VirtIODevice *vdev, hwaddr pa)
58 if (virtio_access_is_big_endian(vdev)) {
59 return ldl_be_phys(&address_space_memory, pa);
61 return ldl_le_phys(&address_space_memory, pa);
64 static inline uint64_t virtio_ldq_phys(VirtIODevice *vdev, hwaddr pa)
66 if (virtio_access_is_big_endian(vdev)) {
67 return ldq_be_phys(&address_space_memory, pa);
69 return ldq_le_phys(&address_space_memory, pa);
72 static inline void virtio_stw_phys(VirtIODevice *vdev, hwaddr pa,
75 if (virtio_access_is_big_endian(vdev)) {
76 stw_be_phys(&address_space_memory, pa, value);
78 stw_le_phys(&address_space_memory, pa, value);
82 static inline void virtio_stl_phys(VirtIODevice *vdev, hwaddr pa,
85 if (virtio_access_is_big_endian(vdev)) {
86 stl_be_phys(&address_space_memory, pa, value);
88 stl_le_phys(&address_space_memory, pa, value);
92 static inline void virtio_stw_p(VirtIODevice *vdev, void *ptr, uint16_t v)
94 if (virtio_access_is_big_endian(vdev)) {
101 static inline void virtio_stl_p(VirtIODevice *vdev, void *ptr, uint32_t v)
103 if (virtio_access_is_big_endian(vdev)) {
110 static inline void virtio_stq_p(VirtIODevice *vdev, void *ptr, uint64_t v)
112 if (virtio_access_is_big_endian(vdev)) {
119 static inline int virtio_lduw_p(VirtIODevice *vdev, const void *ptr)
121 if (virtio_access_is_big_endian(vdev)) {
122 return lduw_be_p(ptr);
124 return lduw_le_p(ptr);
128 static inline int virtio_ldl_p(VirtIODevice *vdev, const void *ptr)
130 if (virtio_access_is_big_endian(vdev)) {
131 return ldl_be_p(ptr);
133 return ldl_le_p(ptr);
137 static inline uint64_t virtio_ldq_p(VirtIODevice *vdev, const void *ptr)
139 if (virtio_access_is_big_endian(vdev)) {
140 return ldq_be_p(ptr);
142 return ldq_le_p(ptr);
146 static inline bool virtio_needs_swap(VirtIODevice *vdev)
148 #ifdef HOST_WORDS_BIGENDIAN
149 return virtio_access_is_big_endian(vdev) ? false : true;
151 return virtio_access_is_big_endian(vdev) ? true : false;
155 static inline uint16_t virtio_tswap16(VirtIODevice *vdev, uint16_t s)
157 #ifdef HOST_WORDS_BIGENDIAN
158 return virtio_access_is_big_endian(vdev) ? s : bswap16(s);
160 return virtio_access_is_big_endian(vdev) ? bswap16(s) : s;
164 static inline void virtio_tswap16s(VirtIODevice *vdev, uint16_t *s)
166 *s = virtio_tswap16(vdev, *s);
169 static inline uint32_t virtio_tswap32(VirtIODevice *vdev, uint32_t s)
171 #ifdef HOST_WORDS_BIGENDIAN
172 return virtio_access_is_big_endian(vdev) ? s : bswap32(s);
174 return virtio_access_is_big_endian(vdev) ? bswap32(s) : s;
178 static inline void virtio_tswap32s(VirtIODevice *vdev, uint32_t *s)
180 *s = virtio_tswap32(vdev, *s);
183 static inline uint64_t virtio_tswap64(VirtIODevice *vdev, uint64_t s)
185 #ifdef HOST_WORDS_BIGENDIAN
186 return virtio_access_is_big_endian(vdev) ? s : bswap64(s);
188 return virtio_access_is_big_endian(vdev) ? bswap64(s) : s;
192 static inline void virtio_tswap64s(VirtIODevice *vdev, uint64_t *s)
194 *s = virtio_tswap64(vdev, *s);
196 #endif /* _QEMU_VIRTIO_ACCESS_H */