1 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Default)] 2 pub struct Major(u32); 3 4 impl Major { 5 // 常量定义参考: 6 // 7 // https://code.dragonos.org.cn/xref/linux-6.1.9/include/uapi/linux/major.h 8 9 /// 未命名的主设备 10 pub const UNNAMED_MAJOR: Self = Self::new(0); 11 12 pub const IDE0_MAJOR: Self = Self::new(3); 13 pub const TTY_MAJOR: Self = Self::new(4); 14 pub const TTYAUX_MAJOR: Self = Self::new(5); 15 pub const HD_MAJOR: Self = Self::IDE0_MAJOR; 16 17 pub const INPUT_MAJOR: Self = Self::new(13); 18 /// /dev/fb* framebuffers 19 pub const FB_MAJOR: Self = Self::new(29); 20 21 pub const fn new(x: u32) -> Self { 22 Major(x) 23 } 24 pub const fn data(&self) -> u32 { 25 self.0 26 } 27 } 28 29 #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)] 30 pub struct DeviceNumber { 31 data: u32, 32 } 33 34 impl DeviceNumber { 35 pub const MINOR_BITS: u32 = 20; 36 pub const MINOR_MASK: u32 = (1 << Self::MINOR_BITS) - 1; 37 38 pub const fn new(major: Major, minor: u32) -> Self { 39 Self { 40 data: (major.data() << Self::MINOR_BITS) | minor, 41 } 42 } 43 44 pub const fn major(&self) -> Major { 45 Major::new(self.data >> Self::MINOR_BITS) 46 } 47 48 pub const fn minor(&self) -> u32 { 49 self.data & 0xfffff 50 } 51 52 pub const fn data(&self) -> u32 { 53 self.data 54 } 55 } 56 57 impl Default for DeviceNumber { 58 fn default() -> Self { 59 Self::new(Major::UNNAMED_MAJOR, 0) 60 } 61 } 62 63 impl From<u32> for DeviceNumber { 64 fn from(x: u32) -> Self { 65 Self { data: x } 66 } 67 } 68