# sv39.rs - source
Source of the Rust file `/home/runner/.cargo/git/checkouts/riscv-ab2abd16c438337b/11d43cf/src/addr/sv39.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 VirtAddrSv39(u64);

    impl VirtualAddress for VirtAddrSv39 {
        unsafe fn as_mut<'a, 'b, T>(&'a self) -> &'b mut T {
            &mut *(self.0 as *mut T)
        }
    }
    impl Address for VirtAddrSv39 {
        fn new(addr: usize) -> Self {
            Self::new_u64(addr as u64)
        }
        fn as_usize(&self) -> usize {
            self.0.try_into().unwrap()
        }
        fn page_number(&self) -> usize {
            self.0.get_bits(12..39).try_into().unwrap()
        }
        fn page_offset(&self) -> usize {
            self.0.get_bits(0..12) as usize
        }
        fn to_4k_aligned(&self) -> Self {
            VirtAddrSv39((self.0 >> 12) << 12)
        }
    }

    impl AddressL3 for VirtAddrSv39 {
        fn p3_index(&self) -> usize {
            self.0.get_bits(30..39) as usize
        }

        fn p2_index(&self) -> usize {
            self.0.get_bits(21..30) as usize
        }
        fn p1_index(&self) -> usize {
            self.0.get_bits(12..21) as usize
        }
        fn from_page_table_indices(
            p3_index: usize,
            p2_index: usize,
            p1_index: usize,
            offset: usize,
        ) -> Self {
            let p3_index = p3_index as u64;
            let p2_index = p2_index as u64;
            let p1_index = p1_index as u64;
            let offset = offset as u64;
            assert!(p3_index.get_bits(11..) == 0, "p3_index exceeding 11 bits");
            assert!(p2_index.get_bits(9..) == 0, "p2_index exceeding 9 bits");
            assert!(p1_index.get_bits(9..) == 0, "p1_index exceeding 9 bits");
            assert!(offset.get_bits(12..) == 0, "offset exceeding 12 bits");
            let mut addr =
                (p3_index << 12 << 9 << 9) | (p2_index << 12 << 9) | (p1_index << 12) | offset;
            if addr.get_bit(38) {
                addr.set_bits(39..64, (1 << (64 - 39)) - 1);
            } else {
                addr.set_bits(39..64, 0x0000);
            }
            VirtAddrSv39::new_u64(addr)
        }
    }

    #[derive(Debug, Copy, Clone, PartialEq, Eq, PartialOrd, Ord)]
    pub struct PhysAddrSv39(u64);
    impl Address for PhysAddrSv39 {
        fn new(addr: usize) -> Self {
            Self::new_u64(addr as u64)
        }
        fn as_usize(&self) -> usize {
            self.0.try_into().unwrap()
        }
        fn page_number(&self) -> usize {
            self.0.get_bits(12..56) as usize
        }
        fn page_offset(&self) -> usize {
            self.0.get_bits(0..12) as usize
        }
        fn to_4k_aligned(&self) -> Self {
            PhysAddrSv39((self.0 >> 12) << 12)
        }
    }

    impl AddressX64 for VirtAddrSv39 {
        fn new_u64(addr: u64) -> Self {
            if addr.get_bit(38) {
                assert!(
                    addr.get_bits(39..64) == (1 << (64 - 39)) - 1,
                    "va 39..64 is not sext"
                );
            } else {
                assert!(addr.get_bits(39..64) == 0x0000, "va 39..64 is not sext");
            }
            VirtAddrSv39(addr as u64)
        }
        fn as_u64(&self) -> u64 {
            self.0
        }
    }
    impl AddressX64 for PhysAddrSv39 {
        fn new_u64(addr: u64) -> Self {
            assert!(
                addr.get_bits(56..64) == 0,
                "Sv39 does not allow pa 56..64!=0"
            );
            PhysAddrSv39(addr)
        }
        fn as_u64(&self) -> u64 {
            self.0
        }
    }

    impl PhysicalAddress for PhysAddrSv39 {}