zynq-rs/src/cortex_a9/regs.rs

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pub trait ReadableRegister<T> {
fn get(&self) -> T;
}
macro_rules! def_reg_get {
($name:ty, $type:ty, $asm_instr:tt) => {
impl ReadableRegister<$type> for $name {
#[inline(always)]
fn get(&self) -> $type {
let mut value;
unsafe { asm!($asm_instr : "=r" (value) ::: "volatile") }
value
}
}
}
}
pub trait WritableRegister<T> {
fn set(&self, value: T);
}
macro_rules! def_reg_set {
($name:ty, $type:ty, $asm_instr:tt) => {
impl WritableRegister<$type> for $name {
#[inline(always)]
fn set(&self, value: $type) {
unsafe { asm!($asm_instr :: "r" (value) :: "volatile") }
}
}
}
}
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/// Stack Pointer
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pub struct SP;
def_reg_get!(SP, u32, "mov $0, sp");
def_reg_set!(SP, u32, "mov sp, $0");
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/// Link register (function call return address)
pub struct LR;
def_reg_get!(LR, u32, "mov $0, lr");
def_reg_set!(LR, u32, "mov lr, $0");
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pub struct MPIDR;
def_reg_get!(MPIDR, u32, "mrc p15, 0, $0, c0, c0, 5");
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/// Invalidate TLBs
pub fn tlbiall() {
unsafe {
asm!("mcr p15, 0, $0, c8, c7, 0" :: "r" (0) :: "volatile");
}
}
/// Invalidate I-Cache
pub fn iciallu() {
unsafe {
asm!("mcr p15, 0, $0, c7, c5, 0" :: "r" (0) :: "volatile");
}
}
/// Invalidate Branch Predictor Array
pub fn bpiall() {
unsafe {
asm!("mcr p15, 0, $0, c7, c5, 6" :: "r" (0) :: "volatile");
}
}
/// Invalidate D-Cache
pub fn dccisw() {
// TODO: $0 is r11 at what value?
unsafe {
asm!("mcr p15, 0, $0, c7, c5, 6" :: "r" (0) :: "volatile");
}
}
/// Enable I-Cache and D-Cache
pub fn sctlr() {
unsafe {
asm!("mcr p15, 0, $0, c1, c0, 0" :: "r" (0x00401004) :: "volatile");
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}
}