//! Anything in Matcha that needs to poke hardware registers directly will
//! go in this crate.

#![no_std]
#![feature(asm)]

pub mod debug_uart;
pub mod mailbox;
pub mod plic;
pub mod plic_constants;

// Software interrupt enable bits in MIE
pub const USIE_BIT: u32 = 1 << 0;
pub const SSIE_BIT: u32 = 1 << 1;
pub const MSIE_BIT: u32 = 1 << 3;

// External interrupt enable bits in MIE
pub const UEIE_BIT: u32 = 1 << 8;
pub const SEIE_BIT: u32 = 1 << 9;
pub const MEIE_BIT: u32 = 1 << 11;

// Global interrupt enable bits in MSTATUS
pub const UIE_BIT: u32 = 0b00000001;
pub const SIE_BIT: u32 = 0b00000010;
pub const MIE_BIT: u32 = 0b00001000;

pub unsafe fn set_mtvec(v: u32) {
    asm!("csrw mtvec, {}", in(reg) v);
}

pub unsafe fn set_mstatus_bits(mask: u32) {
    asm!("csrrs zero, mstatus, {}", in(reg) mask);
}

pub unsafe fn clear_mstatus_bits(mask: u32) {
    asm!("csrrc zero, mstatus, {}", in(reg) mask);
}

pub unsafe fn set_mie_bits(mask: u32) {
    asm!("csrrs zero, mie, {}", in(reg) mask);
}

pub unsafe fn clear_mie_bits(mask: u32) {
    asm!("csrrc zero, mie, {}", in(reg) mask);
}