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From: Kip Macy <kmacy@FreeBSD.org>
To: Perforce Change Reviews <perforce@freebsd.org>
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Subject: PERFORCE change 133452 for review
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http://perforce.freebsd.org/chv.cgi?CH=133452

Change 133452 by kmacy@pandemonium:kmacy:xen31 on 2008/01/17 04:59:46

	bzero the the entire page allocated to the pv_chunk as opposed 
	to just PG_ZERO bytes

Affected files ...

.. //depot/projects/xen31/sys/i386/xen/pmap.c#18 edit

Differences ...

==== //depot/projects/xen31/sys/i386/xen/pmap.c#18 (text+ko) ====

@@ -300,6 +300,22 @@
 CTASSERT(1 << PDESHIFT == sizeof(pd_entry_t));
 CTASSERT(1 << PTESHIFT == sizeof(pt_entry_t));
 
+static __inline void
+pagezero(void *page)
+{
+#if defined(I686_CPU)
+	if (cpu_class == CPUCLASS_686) {
+#if defined(CPU_ENABLE_SSE)
+		if (cpu_feature & CPUID_SSE2)
+			sse2_pagezero(page);
+		else
+#endif
+			i686_pagezero(page);
+	} else
+#endif
+		bzero(page, PAGE_SIZE);
+}
+
 void 
 pd_set(struct pmap *pmap, int ptepindex, vm_paddr_t val, int type)
 {
@@ -2051,7 +2067,7 @@
 	pc = (struct pv_chunk *)pmap_ptelist_alloc(&pv_vafree);
 	pmap_qenter((vm_offset_t)pc, &m, 1);
 	if ((m->flags & PG_ZERO) == 0)
-		bzero(pc, PG_ZERO);
+		pagezero(pc);
 	pc->pc_pmap = pmap;
 	pc->pc_map[0] = pc_freemask[0] & ~1ul;	/* preallocated bit 0 */
 	for (field = 1; field < _NPCM; field++)
@@ -3054,22 +3070,6 @@
 	PMAP_UNLOCK(dst_pmap);
 }	
 
-static __inline void
-pagezero(void *page)
-{
-#if defined(I686_CPU)
-	if (cpu_class == CPUCLASS_686) {
-#if defined(CPU_ENABLE_SSE)
-		if (cpu_feature & CPUID_SSE2)
-			sse2_pagezero(page);
-		else
-#endif
-			i686_pagezero(page);
-	} else
-#endif
-		bzero(page, PAGE_SIZE);
-}
-
 /*
  *	pmap_zero_page zeros the specified hardware page by mapping 
  *	the page into KVM and using bzero to clear its contents.