starnix_kernel_structured_config/
starnix_kernel_structured_config_rust_config_lib_source.rs

1use fidl::unpersist;
2use fidl_cf_sc_internal_starnixkernelstructuredconfig::Config as FidlConfig;
3use fuchsia_inspect::Node;
4use fuchsia_runtime::{take_startup_handle, HandleInfo, HandleType};
5#[derive(Debug)]
6pub struct Config {
7    pub enable_utc_time_adjustment: bool,
8    pub ui_visual_debugging_level: u8,
9}
10impl Config {
11    pub fn take_from_startup_handle() -> Self {
12        let config_vmo: zx::Vmo =
13            take_startup_handle(HandleInfo::new(HandleType::ComponentConfigVmo, 0))
14                .expect("Config VMO handle must be provided and cannot already have been taken.")
15                .into();
16        let config_size =
17            config_vmo.get_content_size().expect("must be able to read config vmo content size");
18        assert_ne!(config_size, 0, "config vmo must be non-empty");
19        let config_bytes =
20            config_vmo.read_to_vec(0, config_size).expect("must be able to read config vmo");
21        let checksum_length = u16::from_le_bytes([config_bytes[0], config_bytes[1]]) as usize;
22        let fidl_start = 2 + checksum_length;
23        let observed_checksum = &config_bytes[2..fidl_start];
24        let expected_checksum = vec![
25            0x35, 0xd9, 0x27, 0x28, 0x08, 0xac, 0xc6, 0x65, 0x10, 0x85, 0xe2, 0x40, 0xad, 0x94,
26            0xa6, 0x61, 0xd5, 0x03, 0x9f, 0x5f, 0x6c, 0x55, 0xdc, 0x8c, 0x0b, 0xee, 0xe8, 0xeb,
27            0x6b, 0x6c, 0xd5, 0x3b,
28        ];
29        assert_eq!(
30            observed_checksum, expected_checksum,
31            "checksum from config VMO does not match expected checksum"
32        );
33        let fidl_config: FidlConfig = unpersist(&config_bytes[fidl_start..])
34            .expect("must be able to parse bytes as config FIDL");
35        Self {
36            enable_utc_time_adjustment: fidl_config.enable_utc_time_adjustment,
37            ui_visual_debugging_level: fidl_config.ui_visual_debugging_level,
38        }
39    }
40    pub fn record_inspect(&self, inspector_node: &Node) {
41        inspector_node.record_bool("enable_utc_time_adjustment", self.enable_utc_time_adjustment);
42        inspector_node
43            .record_uint("ui_visual_debugging_level", self.ui_visual_debugging_level as u64);
44    }
45}