virtio/devices/virtio_gpu/messages/
mod.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
7pub(crate) mod ctrl_header;
8pub(crate) mod resource_attach_backing;
9pub(crate) mod resource_create_2d;
10pub(crate) mod resource_detach_backing;
11pub(crate) mod resource_flush;
12pub(crate) mod set_scanout;
13pub(crate) mod transfer_to_host_2d;
14
15use super::helpers::copy_to_iter;
16use ctrl_header::{CtrlHeader, CtrlType};
17
18pub trait VirtIOGPUReq {
19    const ENCODED_SIZE: usize;
20    const CTRL_TYPE: CtrlType;
21    type ExpectedResponse;
22
23    fn write_to_byte_iter<'a>(
24        &self,
25        dst: &mut impl Iterator<Item = &'a mut u8>,
26    ) -> Result<(), ErrorCode>;
27}
28
29pub trait VirtIOGPUResp {
30    const ENCODED_SIZE: usize;
31    const EXPECTED_CTRL_TYPE: CtrlType;
32
33    fn from_byte_iter_post_checked_ctrl_header(
34        ctrl_header: CtrlHeader,
35        src: &mut impl Iterator<Item = u8>,
36    ) -> Result<Self, ErrorCode>
37    where
38        Self: Sized;
39
40    fn from_byte_iter_post_ctrl_header(
41        ctrl_header: CtrlHeader,
42        src: &mut impl Iterator<Item = u8>,
43    ) -> Result<Self, ErrorCode>
44    where
45        Self: Sized,
46    {
47        if ctrl_header.ctrl_type == Self::EXPECTED_CTRL_TYPE {
48            Self::from_byte_iter_post_checked_ctrl_header(ctrl_header, src)
49        } else {
50            Err(ErrorCode::INVAL)
51        }
52    }
53
54    #[allow(dead_code)]
55    fn from_byte_iter(src: &mut impl Iterator<Item = u8>) -> Result<Self, ErrorCode>
56    where
57        Self: Sized,
58    {
59        let ctrl_header = CtrlHeader::from_byte_iter(src)?;
60        Self::from_byte_iter_post_ctrl_header(ctrl_header, src)
61    }
62}
63
64#[derive(Debug, Copy, Clone)]
65#[repr(C)]
66pub struct Rect {
67    pub x: u32,
68    pub y: u32,
69    pub width: u32,
70    pub height: u32,
71}
72
73impl Rect {
74    pub const fn empty() -> Self {
75        Rect {
76            x: 0,
77            y: 0,
78            width: 0,
79            height: 0,
80        }
81    }
82
83    pub fn is_empty(&self) -> bool {
84        self.width == 0 && self.height == 0
85    }
86
87    fn write_to_byte_iter<'a>(
88        &self,
89        dst: &mut impl Iterator<Item = &'a mut u8>,
90    ) -> Result<(), ErrorCode> {
91        // Write out fields to iterator.
92        //
93        // This struct doesn't need any padding bytes.
94        copy_to_iter(dst, u32::to_le_bytes(self.x).into_iter())?;
95        copy_to_iter(dst, u32::to_le_bytes(self.y).into_iter())?;
96        copy_to_iter(dst, u32::to_le_bytes(self.width).into_iter())?;
97        copy_to_iter(dst, u32::to_le_bytes(self.height).into_iter())?;
98
99        Ok(())
100    }
101}
virtio/devices/virtio_gpu/messages/mod.rs

virtio/devices/virtio_gpu/messages/
mod.rs
