uefi: Add safe EFI_USB_IO_PROTOCOL bindings

uefi-test-runner/src/proto/mod.rs

@@ -24,6 +24,7 @@ pub fn test() {
     rng::test();
     shell_params::test();
     string::test();
+    usb::test();
     misc::test();
 
     // disable the ATA test on aarch64 for now. The aarch64 UEFI Firmware does not yet seem
@@ -96,3 +97,4 @@ mod shell_params;
 mod shim;
 mod string;
 mod tcg;
+mod usb;

uefi-test-runner/src/proto/usb/io.rs

@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+
+use core::mem;
+use uefi::proto::usb::DeviceDescriptor;
+use uefi::proto::usb::io::{ControlTransfer, UsbIo};
+use uefi::{Status, boot};
+
+const DEVICE_TO_HOST: u8 = 1 << 7;
+const STANDARD_REQUEST: u8 = 0b00 << 5;
+const DEVICE_RECIPIENT: u8 = 0b0_0000;
+const GET_DESCRIPTOR_REQUEST: u8 = 6;
+const DEVICE_DESCRIPTOR: u8 = 1;
+
+/// This test iterates through all of the exposed active USB interfaces and
+/// performs checks on each to validate that descriptor acquisition and control
+/// transfers work correctly.
+pub fn test() {
+    info!("Testing USB I/O protocol");
+
+    let handles = boot::locate_handle_buffer(boot::SearchType::from_proto::<UsbIo>())
+        .expect("failed to acquire USB I/O handles");
+
+    for handle in handles.iter().copied() {
+        let mut io = boot::open_protocol_exclusive::<UsbIo>(handle)
+            .expect("failed to open USB I/O protocol");
+
+        let device = io
+            .device_descriptor()
+            .expect("failed to acquire USB device descriptor");
+        io.config_descriptor()
+            .expect("failed to acquire USB config descriptor");
+        io.interface_descriptor()
+            .expect("failed to acquire USB interface descriptor");
+
+        for endpoint_index in 0..16 {
+            let result = io.endpoint_descriptor(endpoint_index);
+            if result
+                .as_ref()
+                .is_err_and(|error| error.status() == Status::NOT_FOUND)
+            {
+                continue;
+            }
+
+            result.expect("failed to acquire USB endpoint descriptor");
+        }
+
+        let supported_languages = io
+            .supported_languages()
+            .expect("failed to acquire supported language list");
+        let test_language = supported_languages[0];
+
+        for string_index in 0..=u8::MAX {
+            let result = io.string_descriptor(test_language, string_index);
+            if result
+                .as_ref()
+                .is_err_and(|error| error.status() == Status::NOT_FOUND)
+            {
+                continue;
+            }
+
+            result.expect("failed to acquire string descriptor");
+        }
+
+        let mut buffer = [0u8; mem::size_of::<DeviceDescriptor>()];
+
+        io.control_transfer(
+            DEVICE_TO_HOST | STANDARD_REQUEST | DEVICE_RECIPIENT,
+            GET_DESCRIPTOR_REQUEST,
+            u16::from(DEVICE_DESCRIPTOR) << 8,
+            0,
+            ControlTransfer::DataIn(&mut buffer[..mem::size_of::<DeviceDescriptor>()]),
+            0,
+        )
+        .expect("failed control transfer");
+        unsafe {
+            assert_eq!(
+                device,
+                buffer.as_ptr().cast::<DeviceDescriptor>().read_unaligned()
+            )
+        }
+    }
+}

uefi-test-runner/src/proto/usb/mod.rs

@@ -0,0 +1,9 @@
+// SPDX-License-Identifier: MIT OR Apache-2.0
+
+pub fn test() {
+    info!("Testing USB protocols");
+
+    io::test();
+}
+
+mod io;

uefi/CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Added
 - Added `ConfigTableEntry::MEMORY_ATTRIBUTES_GUID` and `ConfigTableEntry::IMAGE_SECURITY_DATABASE_GUID`.
+- Added `proto::usb::io::UsbIo`.
 
 ## Changed
 - **Breaking:** `boot::stall` now take `core::time::Duration` instead of `usize`.

uefi/src/proto/mod.rs

@@ -31,6 +31,7 @@ pub mod shell_params;
 pub mod shim;
 pub mod string;
 pub mod tcg;
+pub mod usb;
 
 mod boot_policy;