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

pub mod interrupt;
pub mod mutex;
pub mod timer;

#[macro_use]
mod macros;

/// Move the vector base
#[inline]
pub unsafe fn set_vecbase(base: *const u32) {
    llvm_asm!("wsr.vecbase $0" ::"r"(base) :: "volatile");
}

/// Get the core stack pointer
#[inline(always)]
pub fn get_stack_pointer() -> *const u32 {
    let x: *const u32;
    unsafe { llvm_asm!("mov $0,sp" : "=r"(x) ::: "volatile") };
    x
}

/// Set the core stack pointer
///
/// *This is highly unsafe!*
/// It should be used with care at e.g. program start or when building a task scheduler
///
/// `stack` pointer to the non-inclusive end of the stack (must be 16-byte aligned)
#[inline(always)]
pub unsafe fn set_stack_pointer(stack: *mut u32) {
    llvm_asm!("
        movi a0,0
        mov sp,$0
        " :: "r"(stack):"a0" ::: "volatile" );
}

/// Get the core current program counter
#[inline(always)]
pub fn get_program_counter() -> *const u32 {
    let x: *const u32;
    let _y: u32;
    unsafe {
        llvm_asm!("
            mov $1,a0
            call0 1f
            .align 4
            1: 
            mov $0,a0
            mov a0,$1
            " : "=r"(x),"=r"(_y)::"a0" : "volatile" )
    };
    x
}

/// Get the id of the current core
#[inline]
pub fn get_processor_id() -> u32 {
    let mut x: u32;
    unsafe { llvm_asm!("rsr.prid $0" : "=r"(x) ::: "volatile") };
    x
}

const XDM_OCD_DCR_SET: u32 = 0x10200C;
const DCR_ENABLEOCD: u32 = 0x01;

/// Returns true if a debugger is attached
#[inline]
pub fn is_debugger_attached() -> bool {
    let mut x: u32;
    unsafe { llvm_asm!("rer $0,$1" : "=r"(x): "r"(XDM_OCD_DCR_SET) :: "volatile" ) };
    (x & DCR_ENABLEOCD) != 0
}

/// Insert debug breakpoint
#[inline(always)]
pub fn debug_break() {
    unsafe { llvm_asm!("break 1,15"::::"volatile") };
}