include/hw/virtio/virtio-access.h

   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 */