libcortex_r5: add cache control functions

libcortex_r5/src/cache.rs

@@ -0,0 +1,87 @@
+/// Basically same as the Cortex A9 but with no L2
+pub use libcortex_a9::cache::{
+    iciallu,
+    dcisw,
+    dccsw,
+    dccisw,
+    dccimvac,
+    dccmvac,
+    dcimvac,
+    object_cache_line_addrs,
+    slice_cache_line_addrs,
+    CACHE_LINE,
+    CACHE_LINE_MASK
+};
+use super::asm::{dmb, dsb};
+
+#[inline(always)]
+pub fn dciall() {
+    unsafe {
+        llvm_asm!("mcr p15, 0, $0, c15, c5, 0")
+    }
+}
+
+// D$ clean and invalidate
+pub fn dcci<T>(object: &T) {
+    dmb();
+    for addr in object_cache_line_addrs(object) {
+        dccimvac(addr);
+    }
+    dsb();
+}
+
+pub fn dcci_slice<T>(slice: &[T]) {
+    dmb();
+    for addr in slice_cache_line_addrs(slice) {
+        dccimvac(addr);
+    }
+    dsb();
+}
+
+// D$ clean
+pub fn dcc<T>(object: &T) {
+    dmb();
+    for addr in object_cache_line_addrs(object) {
+        dccmvac(addr);
+    }
+    dsb();
+}
+
+pub fn dcc_slice<T>(slice: &[T]) {
+    if slice.len() == 0 {
+        return;
+    }
+    dmb();
+    for addr in slice_cache_line_addrs(slice) {
+        dccmvac(addr);
+    }
+    dsb();
+}
+
+// D$ invalidate
+pub unsafe fn dci<T>(object: &mut T) {
+    let first_addr = object as *const _ as usize;
+    let beyond_addr = (object as *const _ as usize) + core::mem::size_of_val(object);
+    assert_eq!(first_addr & CACHE_LINE_MASK, 0, "dci object first_addr must be aligned");
+    assert_eq!(beyond_addr & CACHE_LINE_MASK, 0, "dci object beyond_addr must be aligned");
+
+    dmb();
+    for addr in (first_addr..beyond_addr).step_by(CACHE_LINE) {
+        dcimvac(addr);
+    }
+    dsb();
+}
+
+pub unsafe fn dci_slice<T>(slice: &mut [T]) {
+    let first_addr = &slice[0] as *const _ as usize;
+    let beyond_addr = (&slice[slice.len() - 1] as *const _ as usize) +
+        core::mem::size_of_val(&slice[slice.len() - 1]);
+    assert_eq!(first_addr & CACHE_LINE_MASK, 0, "dci slice first_addr must be aligned");
+    assert_eq!(beyond_addr & CACHE_LINE_MASK, 0, "dci slice beyond_addr must be aligned");
+
+    dmb();
+    for addr in (first_addr..beyond_addr).step_by(CACHE_LINE) {
+        dcimvac(addr);
+    }
+    dsb();
+}