# sv32.rs - source
Source of the Rust file `/home/runner/.cargo/git/checkouts/riscv-ab2abd16c438337b/11d43cf/src/addr/sv32.rs`.
Keywords: rust, rustlang, rust-lang

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    use super::*;
    use bit_field::BitField;
    use core::convert::TryInto;
    #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
    pub struct VirtAddrSv32(u32);
    impl Address for VirtAddrSv32 {
        fn new(addr: usize) -> Self {
            VirtAddrSv32(addr.try_into().unwrap())
        }
        fn as_usize(&self) -> usize {
            self.0 as usize
        }
        fn page_number(&self) -> usize {
            self.0.get_bits(12..32) as usize
        }
        fn page_offset(&self) -> usize {
            self.0.get_bits(0..12) as usize
        }
        fn to_4k_aligned(&self) -> Self {
            VirtAddrSv32((self.0 >> 12) << 12)
        }
    }
    impl VirtualAddress for VirtAddrSv32 {
        unsafe fn as_mut<'a, 'b, T>(&'a self) -> &'b mut T {
            &mut *(self.0 as *mut T)
        }
    }

    impl AddressL2 for VirtAddrSv32 {
        fn p2_index(&self) -> usize {
            self.0.get_bits(22..32) as usize
        }

        fn p1_index(&self) -> usize {
            self.0.get_bits(12..22) as usize
        }
        fn from_page_table_indices(p2_index: usize, p1_index: usize, offset: usize) -> Self {
            assert!(p2_index.get_bits(10..) == 0, "p2_index exceeding 10 bits");
            assert!(p1_index.get_bits(10..) == 0, "p1_index exceeding 10 bits");
            assert!(offset.get_bits(12..) == 0, "offset exceeding 12 bits");
            VirtAddrSv32::new((p2_index << 22) | (p1_index << 12) | offset)
        }
    }

    impl AddressX32 for VirtAddrSv32 {
        fn new_u32(addr: u32) -> Self {
            VirtAddrSv32(addr)
        }
        fn as_u32(&self) -> u32 {
            self.0
        }
    }

    #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
    pub struct PhysAddrSv32(u64);
    impl Address for PhysAddrSv32 {
        fn new(addr: usize) -> Self {
            Self::new_u64(addr as u64)
        }
        fn as_usize(&self) -> usize {
            assert!(
                self.0.get_bits(32..34) == 0,
                "Downcasting an Sv32 pa >4GB (32..34!=0) will cause address loss."
            );
            self.0 as usize
        }
        fn page_number(&self) -> usize {
            self.0.get_bits(12..34) as usize
        }
        fn page_offset(&self) -> usize {
            self.0.get_bits(0..12) as usize
        }
        fn to_4k_aligned(&self) -> Self {
            PhysAddrSv32((self.0 >> 12) << 12)
        }
    }

    impl AddressX64 for PhysAddrSv32 {
        fn new_u64(addr: u64) -> Self {
            assert!(
                addr.get_bits(34..64) == 0,
                "Sv32 does not allow pa 34..64!=0"
            );
            PhysAddrSv32(addr)
        }
        fn as_u64(&self) -> u64 {
            self.0
        }
    }

    impl PhysicalAddress for PhysAddrSv32 {}