1 files changed, 124 insertions, 0 deletions
diff --git a/vendor/rustix/src/ioctl/linux.rs b/vendor/rustix/src/ioctl/linux.rs
new file mode 100644
index 00000000..7215228a
--- /dev/null
+++ b/vendor/rustix/src/ioctl/linux.rs
@@ -0,0 +1,124 @@
+//! `ioctl` opcode behavior for Linux platforms.
+
+use super::{Direction, Opcode};
+use consts::*;
+
+/// Compose an opcode from its component parts.
+pub(super) const fn compose_opcode(
+    dir: Direction,
+    group: Opcode,
+    num: Opcode,
+    size: Opcode,
+) -> Opcode {
+    macro_rules! mask_and_shift {
+        ($val:expr, $shift:expr, $mask:expr) => {{
+            ($val & $mask) << $shift
+        }};
+    }
+
+    let dir = match dir {
+        Direction::None => NONE,
+        Direction::Read => READ,
+        Direction::Write => WRITE,
+        Direction::ReadWrite => READ | WRITE,
+    };
+
+    mask_and_shift!(group, GROUP_SHIFT, GROUP_MASK)
+        | mask_and_shift!(num, NUM_SHIFT, NUM_MASK)
+        | mask_and_shift!(size, SIZE_SHIFT, SIZE_MASK)
+        | mask_and_shift!(dir, DIR_SHIFT, DIR_MASK)
+}
+
+const NUM_BITS: Opcode = 8;
+const GROUP_BITS: Opcode = 8;
+
+const NUM_SHIFT: Opcode = 0;
+const GROUP_SHIFT: Opcode = NUM_SHIFT + NUM_BITS;
+const SIZE_SHIFT: Opcode = GROUP_SHIFT + GROUP_BITS;
+const DIR_SHIFT: Opcode = SIZE_SHIFT + SIZE_BITS;
+
+const NUM_MASK: Opcode = (1 << NUM_BITS) - 1;
+const GROUP_MASK: Opcode = (1 << GROUP_BITS) - 1;
+const SIZE_MASK: Opcode = (1 << SIZE_BITS) - 1;
+const DIR_MASK: Opcode = (1 << DIR_BITS) - 1;
+
+#[cfg(any(
+    target_arch = "x86",
+    target_arch = "arm",
+    target_arch = "s390x",
+    target_arch = "x86_64",
+    target_arch = "aarch64",
+    target_arch = "riscv32",
+    target_arch = "riscv64",
+    target_arch = "loongarch64",
+    target_arch = "csky"
+))]
+mod consts {
+    use super::Opcode;
+
+    pub(super) const NONE: Opcode = 0;
+    pub(super) const READ: Opcode = 2;
+    pub(super) const WRITE: Opcode = 1;
+    pub(super) const SIZE_BITS: Opcode = 14;
+    pub(super) const DIR_BITS: Opcode = 2;
+}
+
+#[cfg(any(
+    target_arch = "mips",
+    target_arch = "mips32r6",
+    target_arch = "mips64",
+    target_arch = "mips64r6",
+    target_arch = "powerpc",
+    target_arch = "powerpc64",
+    target_arch = "sparc",
+    target_arch = "sparc64"
+))]
+mod consts {
+    use super::Opcode;
+
+    pub(super) const NONE: Opcode = 1;
+    pub(super) const READ: Opcode = 2;
+    pub(super) const WRITE: Opcode = 4;
+    pub(super) const SIZE_BITS: Opcode = 13;
+    pub(super) const DIR_BITS: Opcode = 3;
+}
+
+#[cfg(test)]
+mod tests {
+    #[allow(unused_imports)]
+    use super::*;
+
+    #[cfg(not(any(
+    // These have no ioctl opcodes defined in linux_raw_sys so we can't use
+    // that as a known-good value for this test.
+    target_arch = "sparc",
+    target_arch = "sparc64"
+)))]
+    #[test]
+    fn check_known_opcodes() {
+        use crate::backend::c::{c_long, c_uint};
+        use core::mem::size_of;
+
+        // _IOR('U', 15, unsigned int)
+        assert_eq!(
+            compose_opcode(
+                Direction::Read,
+                b'U' as Opcode,
+                15,
+                size_of::<c_uint>() as Opcode
+            ),
+            linux_raw_sys::ioctl::USBDEVFS_CLAIMINTERFACE as Opcode
+        );
+
+        // _IOW('v', 2, long)
+        assert_eq!(
+            compose_opcode(
+                Direction::Write,
+                b'v' as Opcode,
+                2,
+                size_of::<c_long>() as Opcode
+            ),
+            linux_raw_sys::ioctl::FS_IOC_SETVERSION as Opcode
+        );
+    }
+}