loongArch64 0.2.6

loongArch64 support for Rust
Documentation 
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pub const LOONGARCH_IOCSR_IPI_STATUS: usize = 0x1000;
pub const LOONGARCH_IOCSR_IPI_EN: usize = 0x1004;
pub const LOONGARCH_IOCSR_IPI_SET: usize = 0x1008;
pub const LOONGARCH_IOCSR_IPI_CLEAR: usize = 0x100c;
pub const LOONGARCH_CSR_MAIL_BUF0: usize = 0x1020;
pub const LOONGARCH_CSR_MAIL_BUF1: usize = 0x1028;
pub const LOONGARCH_CSR_MAIL_BUF2: usize = 0x1030;
pub const LOONGARCH_CSR_MAIL_BUF3: usize = 0x1038;

pub const IOCSR_MBUF_SEND_CPU_SHIFT: usize = 16;
pub const IOCSR_MBUF_SEND_BUF_SHIFT: usize = 32;
pub const IOCSR_MBUF_SEND_H32_MASK: usize = 0xFFFF_FFFF_0000_0000;

pub const LOONGARCH_IOCSR_IPI_SEND: usize = 0x1040;
pub const IOCSR_IPI_SEND_IP_SHIFT: usize = 0;
pub const IOCSR_IPI_SEND_CPU_SHIFT: usize = 16;
pub const IOCSR_IPI_SEND_BLOCKING: u32 = 1 << 31;

pub const LOONGARCH_IOCSR_MBUF_SEND: usize = 0x1048;
pub const IOCSR_MBUF_SEND_BLOCKING: u64 = 1 << 31;
pub const IOCSR_MBUF_SEND_BOX_SHIFT: usize = 2;