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    //! Constants used in rCore

    pub const USER_STACK_SIZE: usize = 4096;
    pub const KERNEL_STACK_SIZE: usize = 4096 * 2;
    pub const MAX_APP_NUM: usize = 4;
    pub const APP_BASE_ADDRESS: usize = 0x80400000;
    pub const APP_SIZE_LIMIT: usize = 0x20000;

    /*
    #[cfg(feature = "board_k210")]
    pub const CLOCK_FREQ: usize = 403000000 / 62;

    #[cfg(feature = "board_qemu")]
    pub const CLOCK_FREQ: usize = 12500000;
    */
    pub use crate::board::CLOCK_FREQ;