--- uio_machdep.c	(revision 209147)
+++ uio_machdep.c	(local)
@@ -51,6 +51,8 @@
 #include <vm/vm_page.h>
 #include <vm/vm_param.h>
 
+#include <machine/cache.h>
+
 /*
  * Implement uiomove(9) from physical memory using a combination
  * of the direct mapping and sf_bufs to reduce the creation and
@@ -91,8 +93,14 @@
 		m = ma[offset >> PAGE_SHIFT];
 		pa = VM_PAGE_TO_PHYS(m);
 		if (pa < MIPS_KSEG0_LARGEST_PHYS) {
-			cp = (char *)MIPS_PHYS_TO_KSEG0(pa);
 			sf = NULL;
+			cp = (char *)MIPS_PHYS_TO_KSEG0(pa) + page_offset;
+			/*
+			 * flush all mappings to this page, KSEG0 address first
+			 * in order to get it overwritten by correct data
+			 */
+			mips_dcache_wbinv_range((vm_offset_t)cp, cnt);
+			pmap_flush_pvcache(m);
 		} else {
 			sf = sf_buf_alloc(m, 0);
 			cp = (char *)sf_buf_kva(sf) + page_offset;
@@ -122,6 +130,8 @@
 		}
 		if (sf != NULL)
 			sf_buf_free(sf);
+		else
+			mips_dcache_wbinv_range((vm_offset_t)cp, cnt);
 		iov->iov_base = (char *)iov->iov_base + cnt;
 		iov->iov_len -= cnt;
 		uio->uio_resid -= cnt;