- mov ip, #0
-@ && 'Clean & Invalidate whole DCache'
-1: mrc p15, 0, r15, c7, c14, 3 @ test,clean,invalidate
- bne 1b
- mcr p15, 0, ip, c7, c5, 0 @ invalidate I cache
- mcr p15, 0, ip, c7, c10, 4 @ drain WB
+ /*
+ * Note: we wish to call __flush_whole_cache but we need to preserve
+ * lr to do so. The only way without touching main memory is to
+ * use r2 which is normally used to test the VM_EXEC flag, and
+ * compensate locally for the skipped ops if it is not set.
+ */
+ mov r2, lr @ abuse r2 to preserve lr
+ bl __flush_whole_cache
+ @ if r2 contains the VM_EXEC bit then the next 2 ops are done already
+ tst r2, #VM_EXEC
+ mcreq p15, 0, ip, c7, c5, 0 @ invalidate I cache
+ mcreq p15, 0, ip, c7, c10, 4 @ drain WB
+