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zynq-rs/libcortex_a9/src/regs.rs

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use libregister::{
register_bit, register_bits,
RegisterR, RegisterW, RegisterRW,
};
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macro_rules! def_reg_r {
($name:tt, $type: ty, $asm_instr:tt) => {
impl RegisterR for $name {
type R = $type;
#[inline]
fn read(&self) -> Self::R {
let mut value: u32;
unsafe { llvm_asm!($asm_instr : "=r" (value) ::: "volatile") }
value.into()
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}
}
}
}
macro_rules! def_reg_w {
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($name:ty, $type:ty, $asm_instr:tt) => {
impl RegisterW for $name {
type W = $type;
#[inline]
fn write(&mut self, value: Self::W) {
let value: u32 = value.into();
unsafe { llvm_asm!($asm_instr :: "r" (value) :: "volatile") }
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}
#[inline]
fn zeroed() -> Self::W {
0u32.into()
}
}
}
}
macro_rules! wrap_reg {
($mod_name: ident) => {
pub mod $mod_name {
pub struct Read {
pub inner: u32,
}
impl From<u32> for Read {
#[inline]
fn from(value: u32) -> Self {
Read { inner: value }
}
}
pub struct Write {
pub inner: u32,
}
impl From<u32> for Write {
#[inline]
fn from(value: u32) -> Self {
Write { inner: value }
}
}
impl Into<u32> for Write {
#[inline]
fn into(self) -> u32 {
self.inner
}
}
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}
}
}
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/// Stack Pointer
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pub struct SP;
def_reg_r!(SP, u32, "mov $0, sp");
def_reg_w!(SP, u32, "mov sp, $0");
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/// Link register (function call return address)
pub struct LR;
def_reg_r!(LR, u32, "mov $0, lr");
def_reg_w!(LR, u32, "mov lr, $0");
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pub struct VBAR;
def_reg_r!(VBAR, u32, "mrc p15, 0, $0, c12, c0, 0");
def_reg_w!(VBAR, u32, "mcr p15, 0, $0, c12, c0, 0");
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pub struct MVBAR;
def_reg_r!(MVBAR, u32, "mrc p15, 0, $0, c12, c0, 1");
def_reg_w!(MVBAR, u32, "mcr p15, 0, $0, c12, c0, 1");
pub struct HVBAR;
def_reg_r!(HVBAR, u32, "mrc p15, 4, $0, c12, c0, 0");
def_reg_w!(HVBAR, u32, "mcr p15, 4, $0, c12, c0, 0");
/// Multiprocess Affinity Register
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pub struct MPIDR;
def_reg_r!(MPIDR, mpidr::Read, "mrc p15, 0, $0, c0, c0, 5");
wrap_reg!(mpidr);
register_bits!(mpidr,
/// CPU core index
cpu_id, u8, 0, 1);
register_bits!(mpidr,
/// Processor index in "multi-socket" systems
cluster_id, u8, 8, 11);
register_bit!(mpidr,
/// true if part of uniprocessor system
u, 30);
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pub struct DFAR;
def_reg_r!(DFAR, u32, "mrc p15, 0, $0, c6, c0, 0");
pub struct DFSR;
def_reg_r!(DFSR, u32, "mrc p15, 0, $0, c5, c0, 0");
pub struct SCTLR;
wrap_reg!(sctlr);
def_reg_r!(SCTLR, sctlr::Read, "mrc p15, 0, $0, c1, c0, 0");
def_reg_w!(SCTLR, sctlr::Write, "mcr p15, 0, $0, c1, c0, 0");
register_bit!(sctlr,
/// Enables MMU
m, 0);
register_bit!(sctlr,
/// Strict Alignment Checking
a, 1);
register_bit!(sctlr,
/// Data Caching
c, 2);
register_bit!(sctlr, sw, 10);
register_bit!(sctlr, z, 11);
register_bit!(sctlr, i, 12);
register_bit!(sctlr, v, 13);
register_bit!(sctlr, ha, 17);
register_bit!(sctlr, ee, 25);
register_bit!(sctlr,
/// (read-only)
nmfi, 27);
register_bit!(sctlr, unaligned, 22);
register_bit!(sctlr,
/// TEX Remap Enable
tre, 28);
register_bit!(sctlr,
/// Access Flag Enable
afe, 29);
register_bit!(sctlr,
/// Thumb Exception Enable
te, 30);
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/// Auxiliary Control Register
pub struct ACTLR;
wrap_reg!(actlr);
def_reg_r!(ACTLR, actlr::Read, "mrc p15, 0, $0, c1, c0, 1");
def_reg_w!(ACTLR, actlr::Write, "mcr p15, 0, $0, c1, c0, 1");
// SMP bit
register_bit!(actlr, parity_on, 9);
register_bit!(actlr, alloc_one_way, 8);
register_bit!(actlr, excl, 7);
register_bit!(actlr, smp, 6);
register_bit!(actlr, write_full_line_of_zeros, 3);
register_bit!(actlr, l1_prefetch_enable, 2);
// L2 cache prefetch hint, in UG585 section 3.4.8
register_bit!(actlr, l2_prefetch_enable, 1);
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// Cache/TLB maintenance broadcast
register_bit!(actlr, fw, 0);
impl RegisterRW for ACTLR {
#[inline]
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fn modify<F: FnOnce(Self::R, Self::W) -> Self::W>(&mut self, f: F) {
let r = self.read();
let w = actlr::Write { inner: r.inner };
let w = f(r, w);
self.write(w);
}
}
impl ACTLR {
pub fn enable_smp(&mut self) {
self.modify(|_, w| w.smp(true).fw(true).alloc_one_way(true));
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}
pub fn enable_prefetch(&mut self) {
self.modify(|_, w| w.l1_prefetch_enable(true).l2_prefetch_enable(true))
}
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}
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/// Domain Access Control Register
pub struct DACR;
def_reg_r!(DACR, u32, "mrc p15, 0, $0, c3, c0, 0");
def_reg_w!(DACR, u32, "mcr p15, 0, $0, c3, c0, 0");
/// Translation Table Base Register 0
pub struct TTBR0;
/// Translation Table Base Register 1
pub struct TTBR1;
def_reg_r!(TTBR0, ttbr::Read, "mrc p15, 0, $0, c2, c0, 0");
def_reg_w!(TTBR0, ttbr::Write, "mcr p15, 0, $0, c2, c0, 0");
def_reg_r!(TTBR1, ttbr::Read, "mrc p15, 0, $0, c2, c0, 1");
def_reg_w!(TTBR1, ttbr::Write, "mcr p15, 0, $0, c2, c0, 1");
wrap_reg!(ttbr);
register_bits!(ttbr, table_base, u32, 14, 31);
register_bit!(ttbr, irgn0, 6);
register_bits!(ttbr, rgn, u8, 3, 4);
register_bit!(ttbr,
/// Translation table walk to shared memory?
s, 1);
register_bit!(ttbr, irgn1, 0);