virtio/devices/virtio_gpu/messages/
transfer_to_host_2d.rs

1// Licensed under the Apache License, Version 2.0 or the MIT License.
2// SPDX-License-Identifier: Apache-2.0 OR MIT
3// Copyright Tock Contributors 2025.
4
5use kernel::ErrorCode;
6
7use super::super::helpers::copy_to_iter;
8use super::ctrl_header::{CtrlHeader, CtrlType};
9use super::{Rect, VirtIOGPUReq, VirtIOGPUResp};
10
11#[derive(Debug, Copy, Clone)]
12#[repr(C)]
13pub struct TransferToHost2DReq {
14    pub ctrl_header: CtrlHeader,
15    pub r: Rect,
16    pub offset: u64,
17    pub resource_id: u32,
18    pub padding: u32,
19}
20
21impl VirtIOGPUReq for TransferToHost2DReq {
22    const ENCODED_SIZE: usize = core::mem::size_of::<Self>();
23    const CTRL_TYPE: CtrlType = CtrlType::CmdTransferToHost2d;
24    type ExpectedResponse = TransferToHost2DResp;
25
26    fn write_to_byte_iter<'a>(
27        &self,
28        dst: &mut impl Iterator<Item = &'a mut u8>,
29    ) -> Result<(), ErrorCode> {
30        // Write out fields to iterator.
31        //
32        // This struct doesn't need any padding bytes.
33        self.ctrl_header.write_to_byte_iter(dst)?;
34        self.r.write_to_byte_iter(dst)?;
35        copy_to_iter(dst, u64::to_le_bytes(self.offset).into_iter())?;
36        copy_to_iter(dst, u32::to_le_bytes(self.resource_id).into_iter())?;
37        copy_to_iter(dst, u32::to_le_bytes(self.padding).into_iter())?;
38
39        Ok(())
40    }
41}
42
43#[derive(Debug, Copy, Clone)]
44#[repr(C)]
45pub struct TransferToHost2DResp {
46    pub ctrl_header: CtrlHeader,
47}
48
49impl VirtIOGPUResp for TransferToHost2DResp {
50    const ENCODED_SIZE: usize = core::mem::size_of::<Self>();
51    const EXPECTED_CTRL_TYPE: CtrlType = CtrlType::RespOkNoData;
52
53    fn from_byte_iter_post_checked_ctrl_header(
54        ctrl_header: CtrlHeader,
55        _src: &mut impl Iterator<Item = u8>,
56    ) -> Result<Self, ErrorCode> {
57        Ok(TransferToHost2DResp { ctrl_header })
58    }
59}
virtio/devices/virtio_gpu/messages/transfer_to_host_2d.rs

virtio/devices/virtio_gpu/messages/
transfer_to_host_2d.rs
