Author: marcel
Date: Mon Jul 2 21:11:01 2012
New Revision: 238030
URL: http://svn.freebsd.org/changeset/base/238030
Log:
Implement cpu_flush_dcache(). This allows us to optimize __syncicache()
for the common case in chich D-caches are coherent by virtue of busdma.
Modified:
head/sys/powerpc/booke/machdep.c
Modified: head/sys/powerpc/booke/machdep.c
==============================================================================
--- head/sys/powerpc/booke/machdep.c Mon Jul 2 21:01:03 2012
(r238029)
+++ head/sys/powerpc/booke/machdep.c Mon Jul 2 21:11:01 2012
(r238030)
@@ -473,7 +473,24 @@ cpu_pcpu_init(struct pcpu *pcpu, int cpu
void
cpu_flush_dcache(void *ptr, size_t len)
{
- /* TBD */
+ register_t addr, off;
+
+ /*
+ * Align the address to a cacheline and adjust the length
+ * accordingly. Then round the length to a multiple of the
+ * cacheline for easy looping.
+ */
+ addr = (uintptr_t)ptr;
+ off = addr & (cacheline_size - 1);
+ addr -= off;
+ len = (len + off + cacheline_size - 1) & ~(cacheline_size - 1);
+
+ while (len > 0) {
+ __asm __volatile ("dcbf 0,%0" :: "r"(addr));
+ __asm __volatile ("sync");
+ addr += cacheline_size;
+ len -= cacheline_size;
+ }
}
void
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