diff options
| -rw-r--r-- | virtio-v1.0-wd01-part1-specification.txt | 40 |
1 files changed, 22 insertions, 18 deletions
diff --git a/virtio-v1.0-wd01-part1-specification.txt b/virtio-v1.0-wd01-part1-specification.txt index b166721..6854023 100644 --- a/virtio-v1.0-wd01-part1-specification.txt +++ b/virtio-v1.0-wd01-part1-specification.txt @@ -1720,6 +1720,10 @@ discoverable via standard operating system algorithms, and adding virtio support is mainly a question of supporting a new control unit type. +As the S/390 is a big endian machine, these channel commands are +big-endian: this is made clear by use of the types be16, be32 and +be64. + 2.3.3.1. Basic Concepts ----------------------- @@ -1799,8 +1803,8 @@ CCW_CMD_READ_VQ_CONF is issued by the guest to obtain information about a queue. It uses the following structure for communicating: struct vq_config_block { - __u16 index; - __u16 max_num; + be16 index; + be16 max_num; } __attribute__ ((packed)); The requested number of buffers for queue index is returned in @@ -1811,12 +1815,12 @@ host about the location used for its queue. The transmitted structure is struct vq_info_block { - __u64 desc; - __u32 res0; - __u16 index; - __u16 num; - __u64 avail; - __u64 used; + be64 desc; + be32 res0; + be16 index; + be16 num; + be64 avail; + be64 used; } __attribute__ ((packed)); desc, avail and used contain the guest addresses for the descriptor table, @@ -1831,10 +1835,10 @@ For a legacy driver or for a driver that selected revision 0, CCW_CMD_SET_VQ uses the following communication block: struct vq_info_block_legacy { - __u64 queue; - __u32 align; - __u16 index; - __u16 num; + be64 queue; + be32 align; + be16 index; + be16 num; } __attribute__ ((packed)); queue contains the guest address for queue index, num the number of buffers @@ -1878,8 +1882,8 @@ The CCW commands dealing with features use the following communication block: struct virtio_feature_desc { - __u32 features; - __u8 index; + be32 features; + u8 index; } __attribute__ ((packed)); features are the 32 bits of features currently accessed, while @@ -1965,10 +1969,10 @@ the driver uses the CCW_CMD_SET_IND_ADAPTER command with the following payload: struct virtio_thinint_area { - __u64 summary_indicator; - __u64 indicator; - __u64 bit_nr; - __u8 isc; + be64 summary_indicator; + be64 indicator; + be64 bit_nr; + u8 isc; } __attribute__ ((packed)); summary_indicator contains the guest address of the 8 bit summary |