xref: /openbmc/qemu/include/hw/virtio/virtio-access.h (revision 09a274d8) 
1 /*
2  * Virtio Accessor Support: In case your target can change endian.
3  *
4  * Copyright IBM, Corp. 2013
5  *
6  * Authors:
7  *  Rusty Russell   <rusty@au.ibm.com>
8  *
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.
13  *
14  */
15 
16 #ifndef QEMU_VIRTIO_ACCESS_H
17 #define QEMU_VIRTIO_ACCESS_H
18 
19 #include "hw/virtio/virtio.h"
20 #include "hw/virtio/virtio-bus.h"
21 
22 #if defined(TARGET_PPC64) || defined(TARGET_ARM)
23 #define LEGACY_VIRTIO_IS_BIENDIAN 1
24 #endif
25 
26 static inline bool virtio_access_is_big_endian(VirtIODevice *vdev)
27 {
28 #if defined(LEGACY_VIRTIO_IS_BIENDIAN)
29     return virtio_is_big_endian(vdev);
30 #elif defined(TARGET_WORDS_BIGENDIAN)
31     if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
32         /* Devices conforming to VIRTIO 1.0 or later are always LE. */
33         return false;
34     }
35     return true;
36 #else
37     return false;
38 #endif
39 }
40 
41 static inline uint16_t virtio_lduw_phys(VirtIODevice *vdev, hwaddr pa)
42 {
43     AddressSpace *dma_as = vdev->dma_as;
44 
45     if (virtio_access_is_big_endian(vdev)) {
46         return lduw_be_phys(dma_as, pa);
47     }
48     return lduw_le_phys(dma_as, pa);
49 }
50 
51 static inline uint32_t virtio_ldl_phys(VirtIODevice *vdev, hwaddr pa)
52 {
53     AddressSpace *dma_as = vdev->dma_as;
54 
55     if (virtio_access_is_big_endian(vdev)) {
56         return ldl_be_phys(dma_as, pa);
57     }
58     return ldl_le_phys(dma_as, pa);
59 }
60 
61 static inline uint64_t virtio_ldq_phys(VirtIODevice *vdev, hwaddr pa)
62 {
63     AddressSpace *dma_as = vdev->dma_as;
64 
65     if (virtio_access_is_big_endian(vdev)) {
66         return ldq_be_phys(dma_as, pa);
67     }
68     return ldq_le_phys(dma_as, pa);
69 }
70 
71 static inline void virtio_stw_phys(VirtIODevice *vdev, hwaddr pa,
72                                    uint16_t value)
73 {
74     AddressSpace *dma_as = vdev->dma_as;
75 
76     if (virtio_access_is_big_endian(vdev)) {
77         stw_be_phys(dma_as, pa, value);
78     } else {
79         stw_le_phys(dma_as, pa, value);
80     }
81 }
82 
83 static inline void virtio_stl_phys(VirtIODevice *vdev, hwaddr pa,
84                                    uint32_t value)
85 {
86     AddressSpace *dma_as = vdev->dma_as;
87 
88     if (virtio_access_is_big_endian(vdev)) {
89         stl_be_phys(dma_as, pa, value);
90     } else {
91         stl_le_phys(dma_as, pa, value);
92     }
93 }
94 
95 static inline void virtio_stw_p(VirtIODevice *vdev, void *ptr, uint16_t v)
96 {
97     if (virtio_access_is_big_endian(vdev)) {
98         stw_be_p(ptr, v);
99     } else {
100         stw_le_p(ptr, v);
101     }
102 }
103 
104 static inline void virtio_stl_p(VirtIODevice *vdev, void *ptr, uint32_t v)
105 {
106     if (virtio_access_is_big_endian(vdev)) {
107         stl_be_p(ptr, v);
108     } else {
109         stl_le_p(ptr, v);
110     }
111 }
112 
113 static inline void virtio_stq_p(VirtIODevice *vdev, void *ptr, uint64_t v)
114 {
115     if (virtio_access_is_big_endian(vdev)) {
116         stq_be_p(ptr, v);
117     } else {
118         stq_le_p(ptr, v);
119     }
120 }
121 
122 static inline int virtio_lduw_p(VirtIODevice *vdev, const void *ptr)
123 {
124     if (virtio_access_is_big_endian(vdev)) {
125         return lduw_be_p(ptr);
126     } else {
127         return lduw_le_p(ptr);
128     }
129 }
130 
131 static inline int virtio_ldl_p(VirtIODevice *vdev, const void *ptr)
132 {
133     if (virtio_access_is_big_endian(vdev)) {
134         return ldl_be_p(ptr);
135     } else {
136         return ldl_le_p(ptr);
137     }
138 }
139 
140 static inline uint64_t virtio_ldq_p(VirtIODevice *vdev, const void *ptr)
141 {
142     if (virtio_access_is_big_endian(vdev)) {
143         return ldq_be_p(ptr);
144     } else {
145         return ldq_le_p(ptr);
146     }
147 }
148 
149 static inline uint16_t virtio_tswap16(VirtIODevice *vdev, uint16_t s)
150 {
151 #ifdef HOST_WORDS_BIGENDIAN
152     return virtio_access_is_big_endian(vdev) ? s : bswap16(s);
153 #else
154     return virtio_access_is_big_endian(vdev) ? bswap16(s) : s;
155 #endif
156 }
157 
158 static inline uint16_t virtio_lduw_phys_cached(VirtIODevice *vdev,
159                                                MemoryRegionCache *cache,
160                                                hwaddr pa)
161 {
162     if (virtio_access_is_big_endian(vdev)) {
163         return lduw_be_phys_cached(cache, pa);
164     }
165     return lduw_le_phys_cached(cache, pa);
166 }
167 
168 static inline uint32_t virtio_ldl_phys_cached(VirtIODevice *vdev,
169                                               MemoryRegionCache *cache,
170                                               hwaddr pa)
171 {
172     if (virtio_access_is_big_endian(vdev)) {
173         return ldl_be_phys_cached(cache, pa);
174     }
175     return ldl_le_phys_cached(cache, pa);
176 }
177 
178 static inline uint64_t virtio_ldq_phys_cached(VirtIODevice *vdev,
179                                               MemoryRegionCache *cache,
180                                               hwaddr pa)
181 {
182     if (virtio_access_is_big_endian(vdev)) {
183         return ldq_be_phys_cached(cache, pa);
184     }
185     return ldq_le_phys_cached(cache, pa);
186 }
187 
188 static inline void virtio_stw_phys_cached(VirtIODevice *vdev,
189                                           MemoryRegionCache *cache,
190                                           hwaddr pa, uint16_t value)
191 {
192     if (virtio_access_is_big_endian(vdev)) {
193         stw_be_phys_cached(cache, pa, value);
194     } else {
195         stw_le_phys_cached(cache, pa, value);
196     }
197 }
198 
199 static inline void virtio_stl_phys_cached(VirtIODevice *vdev,
200                                           MemoryRegionCache *cache,
201                                           hwaddr pa, uint32_t value)
202 {
203     if (virtio_access_is_big_endian(vdev)) {
204         stl_be_phys_cached(cache, pa, value);
205     } else {
206         stl_le_phys_cached(cache, pa, value);
207     }
208 }
209 
210 static inline void virtio_tswap16s(VirtIODevice *vdev, uint16_t *s)
211 {
212     *s = virtio_tswap16(vdev, *s);
213 }
214 
215 static inline uint32_t virtio_tswap32(VirtIODevice *vdev, uint32_t s)
216 {
217 #ifdef HOST_WORDS_BIGENDIAN
218     return virtio_access_is_big_endian(vdev) ? s : bswap32(s);
219 #else
220     return virtio_access_is_big_endian(vdev) ? bswap32(s) : s;
221 #endif
222 }
223 
224 static inline void virtio_tswap32s(VirtIODevice *vdev, uint32_t *s)
225 {
226     *s = virtio_tswap32(vdev, *s);
227 }
228 
229 static inline uint64_t virtio_tswap64(VirtIODevice *vdev, uint64_t s)
230 {
231 #ifdef HOST_WORDS_BIGENDIAN
232     return virtio_access_is_big_endian(vdev) ? s : bswap64(s);
233 #else
234     return virtio_access_is_big_endian(vdev) ? bswap64(s) : s;
235 #endif
236 }
237 
238 static inline void virtio_tswap64s(VirtIODevice *vdev, uint64_t *s)
239 {
240     *s = virtio_tswap64(vdev, *s);
241 }
242 #endif /* QEMU_VIRTIO_ACCESS_H */
243