xref: /openbmc/qemu/include/hw/virtio/virtio-access.h (revision 6016b7b4) 
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 "exec/hwaddr.h"
20 #include "hw/virtio/virtio.h"
21 #include "hw/virtio/virtio-bus.h"
22 
23 #if defined(TARGET_PPC64) || defined(TARGET_ARM)
24 #define LEGACY_VIRTIO_IS_BIENDIAN 1
25 #endif
26 
27 static inline bool virtio_access_is_big_endian(VirtIODevice *vdev)
28 {
29 #if defined(LEGACY_VIRTIO_IS_BIENDIAN)
30     return virtio_is_big_endian(vdev);
31 #elif defined(TARGET_WORDS_BIGENDIAN)
32     if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
33         /* Devices conforming to VIRTIO 1.0 or later are always LE. */
34         return false;
35     }
36     return true;
37 #else
38     return false;
39 #endif
40 }
41 
42 static inline uint16_t virtio_lduw_phys(VirtIODevice *vdev, hwaddr pa)
43 {
44     AddressSpace *dma_as = vdev->dma_as;
45 
46     if (virtio_access_is_big_endian(vdev)) {
47         return lduw_be_phys(dma_as, pa);
48     }
49     return lduw_le_phys(dma_as, pa);
50 }
51 
52 static inline uint32_t virtio_ldl_phys(VirtIODevice *vdev, hwaddr pa)
53 {
54     AddressSpace *dma_as = vdev->dma_as;
55 
56     if (virtio_access_is_big_endian(vdev)) {
57         return ldl_be_phys(dma_as, pa);
58     }
59     return ldl_le_phys(dma_as, pa);
60 }
61 
62 static inline uint64_t virtio_ldq_phys(VirtIODevice *vdev, hwaddr pa)
63 {
64     AddressSpace *dma_as = vdev->dma_as;
65 
66     if (virtio_access_is_big_endian(vdev)) {
67         return ldq_be_phys(dma_as, pa);
68     }
69     return ldq_le_phys(dma_as, pa);
70 }
71 
72 static inline void virtio_stw_phys(VirtIODevice *vdev, hwaddr pa,
73                                    uint16_t value)
74 {
75     AddressSpace *dma_as = vdev->dma_as;
76 
77     if (virtio_access_is_big_endian(vdev)) {
78         stw_be_phys(dma_as, pa, value);
79     } else {
80         stw_le_phys(dma_as, pa, value);
81     }
82 }
83 
84 static inline void virtio_stl_phys(VirtIODevice *vdev, hwaddr pa,
85                                    uint32_t value)
86 {
87     AddressSpace *dma_as = vdev->dma_as;
88 
89     if (virtio_access_is_big_endian(vdev)) {
90         stl_be_phys(dma_as, pa, value);
91     } else {
92         stl_le_phys(dma_as, pa, value);
93     }
94 }
95 
96 static inline void virtio_stw_p(VirtIODevice *vdev, void *ptr, uint16_t v)
97 {
98     if (virtio_access_is_big_endian(vdev)) {
99         stw_be_p(ptr, v);
100     } else {
101         stw_le_p(ptr, v);
102     }
103 }
104 
105 static inline void virtio_stl_p(VirtIODevice *vdev, void *ptr, uint32_t v)
106 {
107     if (virtio_access_is_big_endian(vdev)) {
108         stl_be_p(ptr, v);
109     } else {
110         stl_le_p(ptr, v);
111     }
112 }
113 
114 static inline void virtio_stq_p(VirtIODevice *vdev, void *ptr, uint64_t v)
115 {
116     if (virtio_access_is_big_endian(vdev)) {
117         stq_be_p(ptr, v);
118     } else {
119         stq_le_p(ptr, v);
120     }
121 }
122 
123 static inline int virtio_lduw_p(VirtIODevice *vdev, const void *ptr)
124 {
125     if (virtio_access_is_big_endian(vdev)) {
126         return lduw_be_p(ptr);
127     } else {
128         return lduw_le_p(ptr);
129     }
130 }
131 
132 static inline int virtio_ldl_p(VirtIODevice *vdev, const void *ptr)
133 {
134     if (virtio_access_is_big_endian(vdev)) {
135         return ldl_be_p(ptr);
136     } else {
137         return ldl_le_p(ptr);
138     }
139 }
140 
141 static inline uint64_t virtio_ldq_p(VirtIODevice *vdev, const void *ptr)
142 {
143     if (virtio_access_is_big_endian(vdev)) {
144         return ldq_be_p(ptr);
145     } else {
146         return ldq_le_p(ptr);
147     }
148 }
149 
150 static inline uint16_t virtio_tswap16(VirtIODevice *vdev, uint16_t s)
151 {
152 #ifdef HOST_WORDS_BIGENDIAN
153     return virtio_access_is_big_endian(vdev) ? s : bswap16(s);
154 #else
155     return virtio_access_is_big_endian(vdev) ? bswap16(s) : s;
156 #endif
157 }
158 
159 static inline uint16_t virtio_lduw_phys_cached(VirtIODevice *vdev,
160                                                MemoryRegionCache *cache,
161                                                hwaddr pa)
162 {
163     if (virtio_access_is_big_endian(vdev)) {
164         return lduw_be_phys_cached(cache, pa);
165     }
166     return lduw_le_phys_cached(cache, pa);
167 }
168 
169 static inline uint32_t virtio_ldl_phys_cached(VirtIODevice *vdev,
170                                               MemoryRegionCache *cache,
171                                               hwaddr pa)
172 {
173     if (virtio_access_is_big_endian(vdev)) {
174         return ldl_be_phys_cached(cache, pa);
175     }
176     return ldl_le_phys_cached(cache, pa);
177 }
178 
179 static inline uint64_t virtio_ldq_phys_cached(VirtIODevice *vdev,
180                                               MemoryRegionCache *cache,
181                                               hwaddr pa)
182 {
183     if (virtio_access_is_big_endian(vdev)) {
184         return ldq_be_phys_cached(cache, pa);
185     }
186     return ldq_le_phys_cached(cache, pa);
187 }
188 
189 static inline void virtio_stw_phys_cached(VirtIODevice *vdev,
190                                           MemoryRegionCache *cache,
191                                           hwaddr pa, uint16_t value)
192 {
193     if (virtio_access_is_big_endian(vdev)) {
194         stw_be_phys_cached(cache, pa, value);
195     } else {
196         stw_le_phys_cached(cache, pa, value);
197     }
198 }
199 
200 static inline void virtio_stl_phys_cached(VirtIODevice *vdev,
201                                           MemoryRegionCache *cache,
202                                           hwaddr pa, uint32_t value)
203 {
204     if (virtio_access_is_big_endian(vdev)) {
205         stl_be_phys_cached(cache, pa, value);
206     } else {
207         stl_le_phys_cached(cache, pa, value);
208     }
209 }
210 
211 static inline void virtio_tswap16s(VirtIODevice *vdev, uint16_t *s)
212 {
213     *s = virtio_tswap16(vdev, *s);
214 }
215 
216 static inline uint32_t virtio_tswap32(VirtIODevice *vdev, uint32_t s)
217 {
218 #ifdef HOST_WORDS_BIGENDIAN
219     return virtio_access_is_big_endian(vdev) ? s : bswap32(s);
220 #else
221     return virtio_access_is_big_endian(vdev) ? bswap32(s) : s;
222 #endif
223 }
224 
225 static inline void virtio_tswap32s(VirtIODevice *vdev, uint32_t *s)
226 {
227     *s = virtio_tswap32(vdev, *s);
228 }
229 
230 static inline uint64_t virtio_tswap64(VirtIODevice *vdev, uint64_t s)
231 {
232 #ifdef HOST_WORDS_BIGENDIAN
233     return virtio_access_is_big_endian(vdev) ? s : bswap64(s);
234 #else
235     return virtio_access_is_big_endian(vdev) ? bswap64(s) : s;
236 #endif
237 }
238 
239 static inline void virtio_tswap64s(VirtIODevice *vdev, uint64_t *s)
240 {
241     *s = virtio_tswap64(vdev, *s);
242 }
243 #endif /* QEMU_VIRTIO_ACCESS_H */
244