     1
     2
     3
     4
     5
     6
     7
     8
     9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
    42
    43
    44
    45
    46
    47
    48
    49
    50
    51
    52
    53
    54
    55
    56
    57
    58

    //! Priority mask register

    /// All exceptions with configurable priority are ...
    #[derive(Clone, Copy, Debug, Eq, PartialEq)]
    pub enum Primask {
        /// Active
        Active,
        /// Inactive
        Inactive,
    }

    impl Primask {
        /// All exceptions with configurable priority are active
        pub fn is_active(&self) -> bool {
            *self == Primask::Active
        }

        /// All exceptions with configurable priority are inactive
        pub fn is_inactive(&self) -> bool {
            *self == Primask::Inactive
        }
    }

    /// Reads the CPU register
    #[inline]
    pub fn read() -> Primask {
        match () {
            #[cfg(cortex_m)]
            () => {
                let r = match () {
                    #[cfg(feature = "inline-asm")]
                    () => {
                        let r: u32;
                        unsafe { asm!("mrs $0, PRIMASK" : "=r"(r) ::: "volatile") }
                        r
                    }

                    #[cfg(not(feature = "inline-asm"))]
                    () => {
                        extern "C" {
                            fn __primask() -> u32;
                        }

                        unsafe { __primask() }
                    }
                };

                if r & (1 << 0) == (1 << 0) {
                    Primask::Inactive
                } else {
                    Primask::Active
                }
            }

            #[cfg(not(cortex_m))]
            () => unimplemented!(),
        }
    }

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g. `str,u8` or `String,struct:Vec,test`)