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Code Issues Releases Activity

Optimize zero_page for book-e mmu.

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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.
This commit is contained in:
Justin Hibbits 2015-12-30 02:26:04 +00:00
parent 459021cc7d
commit eabf894627
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=292901
1 changed files with 10 additions and 1 deletions
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11
sys/powerpc/booke/pmap.c
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@ -2235,8 +2235,17 @@ mmu_booke_zero_page_area(mmu_t mmu, vm_page_t m, int off, int size)
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);
}
/*