Author: jhibbits
Date: Wed Dec 30 02:26:04 2015
New Revision: 292901
URL: https://svnweb.freebsd.org/changeset/base/292901
Log:
Optimize zero_page for book-e mmu.
Instead of indirectly calling bzero() through mmu_booke_zero_page_area, zero
the
full page the same way as the AIM pmap logic does: using dcbz.
Modified:
head/sys/powerpc/booke/pmap.c
Modified: head/sys/powerpc/booke/pmap.c
==============================================================================
--- head/sys/powerpc/booke/pmap.c Wed Dec 30 02:23:14 2015
(r292900)
+++ head/sys/powerpc/booke/pmap.c Wed Dec 30 02:26:04 2015
(r292901)
@@ -2235,8 +2235,17 @@ mmu_booke_zero_page_area(mmu_t mmu, vm_p
static void
mmu_booke_zero_page(mmu_t mmu, vm_page_t m)
{
+ vm_offset_t off, va;
- mmu_booke_zero_page_area(mmu, m, 0, PAGE_SIZE);
+ mtx_lock(&zero_page_mutex);
+ va = zero_page_va;
+
+ mmu_booke_kenter(mmu, va, VM_PAGE_TO_PHYS(m));
+ for (off = 0; off < PAGE_SIZE; off += cacheline_size)
+ __asm __volatile("dcbzl 0,%0" :: "r"(va + off));
+ mmu_booke_kremove(mmu, va);
+
+ mtx_unlock(&zero_page_mutex);
}
/*
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