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