forked from M-Labs/zynq-rs
libcortex_a9: revamp cache maintenance
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c3ebafa6ed
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64771bf233
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@ -22,6 +22,15 @@ pub fn bpiall() {
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}
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}
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/// Data cache clean by set/way
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#[inline(always)]
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pub fn dccsw(setway: u32) {
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unsafe {
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asm!("mcr p15, 0, $0, c7, c10, 2" :: "r" (setway) :: "volatile");
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}
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}
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/// Data cache invalidate by set/way
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#[inline(always)]
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pub fn dcisw(setway: u32) {
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unsafe {
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@ -60,74 +69,76 @@ pub fn dciall() {
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}
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}
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/// Data cache clear and invalidate by memory virtual address. This
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const CACHE_LINE: usize = 0x20;
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const CACHE_LINE_MASK: usize = CACHE_LINE - 1;
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#[inline]
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fn cache_line_addrs(first_addr: usize, beyond_addr: usize) -> impl Iterator<Item = usize> {
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let first_addr = first_addr & !CACHE_LINE_MASK;
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let beyond_addr = (beyond_addr | CACHE_LINE_MASK) + 1;
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(first_addr..beyond_addr).step_by(CACHE_LINE)
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}
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fn object_cache_line_addrs<T>(object: &T) -> impl Iterator<Item = usize> {
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let first_addr = object as *const _ as usize;
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let beyond_addr = (object as *const _ as usize) + core::mem::size_of_val(object);
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cache_line_addrs(first_addr, beyond_addr)
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}
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fn slice_cache_line_addrs<T>(slice: &[T]) -> impl Iterator<Item = usize> {
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let first_addr = &slice[0] as *const _ as usize;
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let beyond_addr = (&slice[slice.len() - 1] as *const _ as usize) +
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core::mem::size_of_val(&slice[slice.len() - 1]);
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cache_line_addrs(first_addr, beyond_addr)
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}
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/// Data cache clean and invalidate by memory virtual address. This
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/// flushes data out to the point of coherency, and invalidates the
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/// corresponding cache line (as appropriate when DMA is meant to be
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/// writing into it).
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#[inline(always)]
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pub fn dccimva(addr: usize) {
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pub fn dccimvac(addr: usize) {
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unsafe {
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asm!("mcr p15, 0, $0, c7, c14, 1" :: "r" (addr) :: "volatile");
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}
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}
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/// clear cache line by virtual address to point of coherency (DCCMVAC)
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#[inline]
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pub fn dccmvac(addr: u32) {
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/// Data cache clean and invalidate for an object.
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pub fn dcci<T>(object: &T) {
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for addr in object_cache_line_addrs(object) {
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dccimvac(addr);
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}
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}
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pub fn dcci_slice<T>(slice: &mut [T]) {
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for addr in slice_cache_line_addrs(slice) {
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dccimvac(addr);
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}
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}
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/// Data cache clean by memory virtual address.
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#[inline(always)]
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pub fn dccmvac(addr: usize) {
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unsafe {
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asm!("mcr p15, 0, $0, c7, c10, 1" :: "r" (addr) :: "volatile");
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}
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}
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/// The DCCIVMA (data cache clear and invalidate) applied to the
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/// region of memory occupied by the argument. This does not modify
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/// the argument, but due to the invalidate part (only ever needed if
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/// external write access is to be granted, e.g. by DMA) it only makes
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/// sense if the caller has exclusive access to it as otherwise other
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/// accesses might just bring it back into the data cache.
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pub fn dcci<T>(object: &mut T) {
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let cache_line = 0x20;
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let first_addr =
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(object as *mut _ as *const _ as usize) & !(cache_line - 1);
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let beyond_addr = (
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(object as *mut _ as *const _ as usize)
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+ core::mem::size_of_val(object)
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+ (cache_line - 1)
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) & !(cache_line - 1);
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for addr in (first_addr..beyond_addr).step_by(cache_line) {
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dccimva(addr);
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/// Data cache clean for an object.
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pub fn dcc<T>(object: &T) {
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for addr in object_cache_line_addrs(object) {
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dccmvac(addr);
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}
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}
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pub fn dcci_slice_content<T>(slice: &mut [T]) {
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if slice.len() == 0 {
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return;
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}
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let cache_line = 0x20;
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let first_addr =
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(&slice[0] as *const _ as usize) & !(cache_line - 1);
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let beyond_addr = (
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(&slice[slice.len() - 1] as *const _ as usize)
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+ (cache_line - 1)
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) & !(cache_line - 1);
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for addr in (first_addr..beyond_addr).step_by(cache_line) {
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dccimva(addr);
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}
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}
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pub fn dcci_slice_content_unmut<T>(slice: &[T]) {
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if slice.len() == 0 {
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return;
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}
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let cache_line = 0x20;
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let first_addr =
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(&slice[0] as *const _ as usize) & !(cache_line - 1);
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let beyond_addr = (
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(&slice[slice.len() - 1] as *const _ as usize)
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+ (cache_line - 1)
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) & !(cache_line - 1);
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for addr in (first_addr..beyond_addr).step_by(cache_line) {
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dccimva(addr);
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/// Data cache clean for an object. Panics if not properly
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/// aligned and properly sized to be contained in an exact number of
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/// cache lines.
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pub fn dcc_slice<T>(slice: &[T]) {
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for addr in slice_cache_line_addrs(slice) {
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dccmvac(addr);
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}
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}
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@ -136,79 +147,30 @@ pub fn dcci_slice_content_unmut<T>(slice: &[T]) {
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/// unsafe, as this discards a write-back cache line, potentially
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/// affecting more data than intended.
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#[inline(always)]
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pub unsafe fn dcimva(addr: usize) {
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pub unsafe fn dcimvac(addr: usize) {
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asm!("mcr p15, 0, $0, c7, c6, 1" :: "r" (addr) :: "volatile");
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}
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/// Data cache invalidate for an object. Panics if not properly
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/// aligned and properly sized to be contained in an exact number of
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/// cache lines.
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pub fn dci<T>(object: &mut T) {
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let cache_line = 0x20;
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let first_addr = object as *mut _ as *const _ as usize;
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let beyond_addr = (object as *mut _ as *const _ as usize) +
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core::mem::size_of_val(object);
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assert_eq!((first_addr & (cache_line - 1)), 0x00);
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assert_eq!((beyond_addr & (cache_line - 1)), 0x00);
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for addr in (first_addr..beyond_addr).step_by(cache_line) {
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unsafe {
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dcimva(addr);
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}
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/// Data cache clean and invalidate for an object.
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pub unsafe fn dci<T>(object: &mut T) {
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let first_addr = object as *const _ as usize;
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let beyond_addr = (object as *const _ as usize) + core::mem::size_of_val(object);
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assert_eq!(first_addr & CACHE_LINE_MASK, 0, "dci object first_addr must be aligned");
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assert_eq!(beyond_addr & CACHE_LINE_MASK, 0, "dci object beyond_addr must be aligned");
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for addr in (first_addr..beyond_addr).step_by(CACHE_LINE) {
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dcimvac(addr);
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}
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}
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/// Data cache invalidate for the contents of a slice. Panics if not
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/// properly aligned and properly sized to be contained in an exact
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/// number of cache lines.
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pub fn dci_slice_content<T>(slice: &mut [T]) {
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if slice.len() == 0 {
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return;
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}
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let cache_line = 0x20;
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pub unsafe fn dci_slice<T>(slice: &mut [T]) {
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let first_addr = &slice[0] as *const _ as usize;
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let beyond_addr = (&slice[slice.len() - 1] as *const _ as usize)
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+ core::mem::size_of::<T>();
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assert_eq!((first_addr & (cache_line - 1)), 0x00);
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assert_eq!((beyond_addr & (cache_line - 1)), 0x00);
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for addr in (first_addr..beyond_addr).step_by(cache_line) {
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unsafe {
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dcimva(addr);
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}
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}
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}
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let beyond_addr = (&slice[slice.len() - 1] as *const _ as usize) +
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core::mem::size_of_val(&slice[slice.len() - 1]);
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assert_eq!(first_addr & CACHE_LINE_MASK, 0, "dci slice first_addr must be aligned");
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assert_eq!(beyond_addr & CACHE_LINE_MASK, 0, "dci slice beyond_addr must be aligned");
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pub unsafe fn dci_more_than_slice_content<T>(slice: &mut [T]) {
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if slice.len() == 0 {
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return;
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}
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let cache_line = 0x20;
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let first_addr =
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(&slice[0] as *const _ as usize) & !(cache_line - 1);
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let beyond_addr = (
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(&slice[slice.len() - 1] as *const _ as usize)
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+ (cache_line - 1)
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) & !(cache_line - 1);
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assert_eq!((first_addr & (cache_line - 1)), 0x00);
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assert_eq!((beyond_addr & (cache_line - 1)), 0x00);
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for addr in (first_addr..beyond_addr).step_by(cache_line) {
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dcimva(addr);
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}
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}
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pub unsafe fn dci_more_than_slice_content_nonmut<T>(slice: &[T]) {
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if slice.len() == 0 {
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return;
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}
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let cache_line = 0x20;
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let first_addr =
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(&slice[0] as *const _ as usize) & !(cache_line - 1);
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let beyond_addr = (
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(&slice[slice.len() - 1] as *const _ as usize)
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+ (cache_line - 1)
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) & !(cache_line - 1);
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assert_eq!((first_addr & (cache_line - 1)), 0x00);
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assert_eq!((beyond_addr & (cache_line - 1)), 0x00);
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for addr in (first_addr..beyond_addr).step_by(cache_line) {
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dcimva(addr);
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for addr in (first_addr..beyond_addr).step_by(CACHE_LINE) {
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dcimvac(addr);
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}
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}
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