ec150c7e09
Back in 2016, we discussed[1] rules for headers, and these were
generally liked:
1. Have a carefully curated header that's included everywhere first. We
got that already thanks to Peter: osdep.h.
2. Headers should normally include everything they need beyond osdep.h.
If exceptions are needed for some reason, they must be documented in
the header. If all that's needed from a header is typedefs, put
those into qemu/typedefs.h instead of including the header.
3. Cyclic inclusion is forbidden.
This patch gets include/ closer to obeying 2.
It's actually extracted from my "[RFC] Baby steps towards saner
headers" series[2], which demonstrates a possible path towards
checking 2 automatically. It passes the RFC test there.
[1] Message-ID: <87h9g8j57d.fsf@blackfin.pond.sub.org>
https://lists.nongnu.org/archive/html/qemu-devel/2016-03/msg03345.html
[2] Message-Id: <20190711122827.18970-1-armbru@redhat.com>
https://lists.nongnu.org/archive/html/qemu-devel/2019-07/msg02715.html
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20190812052359.30071-2-armbru@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
244 lines
6.3 KiB
C
244 lines
6.3 KiB
C
/*
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* Virtio Accessor Support: In case your target can change endian.
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*
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* Copyright IBM, Corp. 2013
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*
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* Authors:
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* Rusty Russell <rusty@au.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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#ifndef QEMU_VIRTIO_ACCESS_H
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#define QEMU_VIRTIO_ACCESS_H
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#include "exec/hwaddr.h"
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#include "hw/virtio/virtio.h"
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#include "hw/virtio/virtio-bus.h"
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#if defined(TARGET_PPC64) || defined(TARGET_ARM)
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#define LEGACY_VIRTIO_IS_BIENDIAN 1
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#endif
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static inline bool virtio_access_is_big_endian(VirtIODevice *vdev)
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{
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#if defined(LEGACY_VIRTIO_IS_BIENDIAN)
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return virtio_is_big_endian(vdev);
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#elif defined(TARGET_WORDS_BIGENDIAN)
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if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
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/* Devices conforming to VIRTIO 1.0 or later are always LE. */
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return false;
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}
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return true;
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#else
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return false;
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#endif
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}
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static inline uint16_t virtio_lduw_phys(VirtIODevice *vdev, hwaddr pa)
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{
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AddressSpace *dma_as = vdev->dma_as;
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if (virtio_access_is_big_endian(vdev)) {
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return lduw_be_phys(dma_as, pa);
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}
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return lduw_le_phys(dma_as, pa);
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}
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static inline uint32_t virtio_ldl_phys(VirtIODevice *vdev, hwaddr pa)
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{
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AddressSpace *dma_as = vdev->dma_as;
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if (virtio_access_is_big_endian(vdev)) {
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return ldl_be_phys(dma_as, pa);
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}
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return ldl_le_phys(dma_as, pa);
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}
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static inline uint64_t virtio_ldq_phys(VirtIODevice *vdev, hwaddr pa)
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{
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AddressSpace *dma_as = vdev->dma_as;
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if (virtio_access_is_big_endian(vdev)) {
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return ldq_be_phys(dma_as, pa);
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}
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return ldq_le_phys(dma_as, pa);
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}
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static inline void virtio_stw_phys(VirtIODevice *vdev, hwaddr pa,
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uint16_t value)
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{
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AddressSpace *dma_as = vdev->dma_as;
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if (virtio_access_is_big_endian(vdev)) {
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stw_be_phys(dma_as, pa, value);
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} else {
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stw_le_phys(dma_as, pa, value);
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}
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}
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static inline void virtio_stl_phys(VirtIODevice *vdev, hwaddr pa,
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uint32_t value)
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{
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AddressSpace *dma_as = vdev->dma_as;
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if (virtio_access_is_big_endian(vdev)) {
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stl_be_phys(dma_as, pa, value);
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} else {
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stl_le_phys(dma_as, pa, value);
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}
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}
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static inline void virtio_stw_p(VirtIODevice *vdev, void *ptr, uint16_t v)
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{
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if (virtio_access_is_big_endian(vdev)) {
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stw_be_p(ptr, v);
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} else {
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stw_le_p(ptr, v);
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}
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}
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static inline void virtio_stl_p(VirtIODevice *vdev, void *ptr, uint32_t v)
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{
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if (virtio_access_is_big_endian(vdev)) {
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stl_be_p(ptr, v);
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} else {
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stl_le_p(ptr, v);
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}
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}
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static inline void virtio_stq_p(VirtIODevice *vdev, void *ptr, uint64_t v)
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{
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if (virtio_access_is_big_endian(vdev)) {
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stq_be_p(ptr, v);
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} else {
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stq_le_p(ptr, v);
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}
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}
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static inline int virtio_lduw_p(VirtIODevice *vdev, const void *ptr)
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{
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if (virtio_access_is_big_endian(vdev)) {
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return lduw_be_p(ptr);
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} else {
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return lduw_le_p(ptr);
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}
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}
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static inline int virtio_ldl_p(VirtIODevice *vdev, const void *ptr)
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{
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if (virtio_access_is_big_endian(vdev)) {
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return ldl_be_p(ptr);
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} else {
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return ldl_le_p(ptr);
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}
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}
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static inline uint64_t virtio_ldq_p(VirtIODevice *vdev, const void *ptr)
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{
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if (virtio_access_is_big_endian(vdev)) {
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return ldq_be_p(ptr);
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} else {
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return ldq_le_p(ptr);
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}
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}
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static inline uint16_t virtio_tswap16(VirtIODevice *vdev, uint16_t s)
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{
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#ifdef HOST_WORDS_BIGENDIAN
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return virtio_access_is_big_endian(vdev) ? s : bswap16(s);
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#else
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return virtio_access_is_big_endian(vdev) ? bswap16(s) : s;
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#endif
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}
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static inline uint16_t virtio_lduw_phys_cached(VirtIODevice *vdev,
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MemoryRegionCache *cache,
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hwaddr pa)
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{
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if (virtio_access_is_big_endian(vdev)) {
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return lduw_be_phys_cached(cache, pa);
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}
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return lduw_le_phys_cached(cache, pa);
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}
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static inline uint32_t virtio_ldl_phys_cached(VirtIODevice *vdev,
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MemoryRegionCache *cache,
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hwaddr pa)
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{
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if (virtio_access_is_big_endian(vdev)) {
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return ldl_be_phys_cached(cache, pa);
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}
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return ldl_le_phys_cached(cache, pa);
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}
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static inline uint64_t virtio_ldq_phys_cached(VirtIODevice *vdev,
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MemoryRegionCache *cache,
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hwaddr pa)
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{
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if (virtio_access_is_big_endian(vdev)) {
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return ldq_be_phys_cached(cache, pa);
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}
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return ldq_le_phys_cached(cache, pa);
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}
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static inline void virtio_stw_phys_cached(VirtIODevice *vdev,
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MemoryRegionCache *cache,
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hwaddr pa, uint16_t value)
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{
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if (virtio_access_is_big_endian(vdev)) {
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stw_be_phys_cached(cache, pa, value);
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} else {
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stw_le_phys_cached(cache, pa, value);
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}
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}
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static inline void virtio_stl_phys_cached(VirtIODevice *vdev,
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MemoryRegionCache *cache,
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hwaddr pa, uint32_t value)
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{
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if (virtio_access_is_big_endian(vdev)) {
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stl_be_phys_cached(cache, pa, value);
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} else {
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stl_le_phys_cached(cache, pa, value);
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}
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}
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static inline void virtio_tswap16s(VirtIODevice *vdev, uint16_t *s)
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{
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*s = virtio_tswap16(vdev, *s);
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}
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static inline uint32_t virtio_tswap32(VirtIODevice *vdev, uint32_t s)
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{
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#ifdef HOST_WORDS_BIGENDIAN
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return virtio_access_is_big_endian(vdev) ? s : bswap32(s);
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#else
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return virtio_access_is_big_endian(vdev) ? bswap32(s) : s;
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#endif
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}
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static inline void virtio_tswap32s(VirtIODevice *vdev, uint32_t *s)
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{
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*s = virtio_tswap32(vdev, *s);
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}
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static inline uint64_t virtio_tswap64(VirtIODevice *vdev, uint64_t s)
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{
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#ifdef HOST_WORDS_BIGENDIAN
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return virtio_access_is_big_endian(vdev) ? s : bswap64(s);
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#else
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return virtio_access_is_big_endian(vdev) ? bswap64(s) : s;
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#endif
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}
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static inline void virtio_tswap64s(VirtIODevice *vdev, uint64_t *s)
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{
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*s = virtio_tswap64(vdev, *s);
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}
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#endif /* QEMU_VIRTIO_ACCESS_H */
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