memory/
capability.rs

1use core::fmt::Display;
2
3#[derive(Clone, Copy, Debug, PartialEq, Eq, Default)]
4pub struct Capabilities(u8);
5
6impl Capabilities {
7    pub const EXECUTABLE_FLAG: u8 = 1 << 0;
8    pub const DIRECT_MEMORY_ACCESS_FLAG: u8 = 1 << 1;
9
10    pub const fn new(executable: bool, direct_memory_access: bool) -> Self {
11        Capabilities(0)
12            .set_executable(executable)
13            .set_direct_memory_access(direct_memory_access)
14    }
15
16    pub const fn get_executable(&self) -> bool {
17        self.0 & Capabilities::EXECUTABLE_FLAG != 0
18    }
19
20    pub const fn get_direct_memory_access(&self) -> bool {
21        self.0 & Capabilities::DIRECT_MEMORY_ACCESS_FLAG != 0
22    }
23
24    pub const fn set_executable(mut self, value: bool) -> Self {
25        if value {
26            self.0 |= Capabilities::EXECUTABLE_FLAG;
27        } else {
28            self.0 &= !Capabilities::EXECUTABLE_FLAG;
29        }
30        self
31    }
32
33    pub const fn set_direct_memory_access(mut self, value: bool) -> Self {
34        if value {
35            self.0 |= Capabilities::DIRECT_MEMORY_ACCESS_FLAG;
36        } else {
37            self.0 &= !Capabilities::DIRECT_MEMORY_ACCESS_FLAG;
38        }
39        self
40    }
41
42    pub const fn is_subset_of(&self, other: Capabilities) -> bool {
43        (self.0 & other.0) == self.0
44    }
45
46    pub const fn is_superset_of(&self, other: Capabilities) -> bool {
47        (self.0 & other.0) == other.0
48    }
49
50    pub const fn from_u8(value: u8) -> Self {
51        Capabilities(value)
52    }
53
54    pub const fn to_u8(&self) -> u8 {
55        self.0
56    }
57}
58
59impl Display for Capabilities {
60    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
61        write!(f, "Capabilities: ")?;
62        if self.get_executable() {
63            write!(f, "Executable ")?;
64        }
65        if self.get_direct_memory_access() {
66            write!(f, "Direct memory access ")?;
67        }
68        Ok(())
69    }
70}
memory/capability.rs

memory/
capability.rs
