zynq-rs/src/cortex_a9/cache.rs

207 lines
6.4 KiB
Rust

/// Invalidate TLBs
#[inline(always)]
pub fn tlbiall() {
unsafe {
asm!("mcr p15, 0, $0, c8, c7, 0" :: "r" (0) :: "volatile");
}
}
/// Invalidate I-Cache
#[inline(always)]
pub fn iciallu() {
unsafe {
asm!("mcr p15, 0, $0, c7, c5, 0" :: "r" (0) :: "volatile");
}
}
/// Invalidate Branch Predictor Array
#[inline(always)]
pub fn bpiall() {
unsafe {
asm!("mcr p15, 0, $0, c7, c5, 6" :: "r" (0) :: "volatile");
}
}
#[inline(always)]
pub fn dcisw(setway: u32) {
unsafe {
// acc. to ARM Architecture Reference Manual, Figure B3-32;
// also see example code (for DCCISW, but DCISW will be
// analogous) "Example code for cache maintenance operations"
// on pages B2-1286 and B2-1287.
asm!("mcr p15, 0, $0, c7, c6, 2" :: "r" (setway) :: "volatile");
}
}
/// A made-up "instruction": invalidate all of the L1 D-Cache
#[inline(always)]
pub fn dciall() {
// the cache associativity could be read from a register, but will
// always be 4 in L1 data cache of a cortex a9
let ways = 4;
let bit_pos_of_way = 30; // 32 - log2(ways)
// the cache sets could be read from a register, but are always
// 256 for the cores in the zync-7000; in general, 128 or 512 are
// also possible.
let sets = 256;
let bit_pos_of_set = 5; // for a line size of 8 words = 2^5 bytes
// select L1 data cache
unsafe {
asm!("mcr p15, 2, $0, c0, c0, 0" :: "r" (0) :: "volatile");
}
// Invalidate entire D-Cache by iterating every set and every way
for set in 0..sets {
for way in 0..ways {
dcisw((set << bit_pos_of_set) | (way << bit_pos_of_way));
}
}
}
/// Data cache clear and invalidate by memory virtual address. This
/// flushes data out to the point of coherency, and invalidates the
/// corresponding cache line (as appropriate when DMA is meant to be
/// writing into it).
#[inline(always)]
pub fn dccimva(addr: usize) {
unsafe {
asm!("mcr p15, 0, $0, c7, c14, 1" :: "r" (addr) :: "volatile");
}
}
/// The DCCIVMA (data cache clear and invalidate) applied to the
/// region of memory occupied by the argument. This does not modify
/// the argument, but due to the invalidate part (only ever needed if
/// external write access is to be granted, e.g. by DMA) it only makes
/// sense if the caller has exclusive access to it as otherwise other
/// accesses might just bring it back into the data cache.
pub fn dcci<T>(object: &mut T) {
let cache_line = 0x20;
let first_addr =
(object as *mut _ as *const _ as usize) & !(cache_line - 1);
let beyond_addr = (
(object as *mut _ as *const _ as usize)
+ core::mem::size_of_val(object)
+ (cache_line - 1)
) & !(cache_line - 1);
for addr in (first_addr..beyond_addr).step_by(cache_line) {
dccimva(addr);
}
}
pub fn dcci_slice_content<T>(slice: &mut [T]) {
if slice.len() == 0 {
return;
}
let cache_line = 0x20;
let first_addr =
(&slice[0] as *const _ as usize) & !(cache_line - 1);
let beyond_addr = (
(&slice[slice.len() - 1] as *const _ as usize)
+ (cache_line - 1)
) & !(cache_line - 1);
for addr in (first_addr..beyond_addr).step_by(cache_line) {
dccimva(addr);
}
}
pub fn dcci_slice_content_unmut<T>(slice: &[T]) {
if slice.len() == 0 {
return;
}
let cache_line = 0x20;
let first_addr =
(&slice[0] as *const _ as usize) & !(cache_line - 1);
let beyond_addr = (
(&slice[slice.len() - 1] as *const _ as usize)
+ (cache_line - 1)
) & !(cache_line - 1);
for addr in (first_addr..beyond_addr).step_by(cache_line) {
dccimva(addr);
}
}
/// Data cache invalidate by memory virtual address. This and
/// invalidates the cache line containing the given address. Super
/// unsafe, as this discards a write-back cache line, potentially
/// affecting more data than intended.
#[inline(always)]
pub unsafe fn dcimva(addr: usize) {
asm!("mcr p15, 0, $0, c7, c6, 1" :: "r" (addr) :: "volatile");
}
/// Data cache invalidate for an object. Panics if not properly
/// aligned and properly sized to be contained in an exact number of
/// cache lines.
pub fn dci<T>(object: &mut T) {
let cache_line = 0x20;
let first_addr = object as *mut _ as *const _ as usize;
let beyond_addr = (object as *mut _ as *const _ as usize) +
core::mem::size_of_val(object);
assert_eq!((first_addr & (cache_line - 1)), 0x00);
assert_eq!((beyond_addr & (cache_line - 1)), 0x00);
for addr in (first_addr..beyond_addr).step_by(cache_line) {
unsafe {
dcimva(addr);
}
}
}
/// Data cache invalidate for the contents of a slice. Panics if not
/// properly aligned and properly sized to be contained in an exact
/// number of cache lines.
pub fn dci_slice_content<T>(slice: &mut [T]) {
if slice.len() == 0 {
return;
}
let cache_line = 0x20;
let first_addr = &slice[0] as *const _ as usize;
let beyond_addr = (&slice[slice.len() - 1] as *const _ as usize)
+ core::mem::size_of::<T>();
assert_eq!((first_addr & (cache_line - 1)), 0x00);
assert_eq!((beyond_addr & (cache_line - 1)), 0x00);
for addr in (first_addr..beyond_addr).step_by(cache_line) {
unsafe {
dcimva(addr);
}
}
}
pub unsafe fn dci_more_than_slice_content<T>(slice: &mut [T]) {
if slice.len() == 0 {
return;
}
let cache_line = 0x20;
let first_addr =
(&slice[0] as *const _ as usize) & !(cache_line - 1);
let beyond_addr = (
(&slice[slice.len() - 1] as *const _ as usize)
+ (cache_line - 1)
) & !(cache_line - 1);
assert_eq!((first_addr & (cache_line - 1)), 0x00);
assert_eq!((beyond_addr & (cache_line - 1)), 0x00);
for addr in (first_addr..beyond_addr).step_by(cache_line) {
dcimva(addr);
}
}
pub unsafe fn dci_more_than_slice_content_nonmut<T>(slice: &[T]) {
if slice.len() == 0 {
return;
}
let cache_line = 0x20;
let first_addr =
(&slice[0] as *const _ as usize) & !(cache_line - 1);
let beyond_addr = (
(&slice[slice.len() - 1] as *const _ as usize)
+ (cache_line - 1)
) & !(cache_line - 1);
assert_eq!((first_addr & (cache_line - 1)), 0x00);
assert_eq!((beyond_addr & (cache_line - 1)), 0x00);
for addr in (first_addr..beyond_addr).step_by(cache_line) {
dcimva(addr);
}
}