diff options
| author | Mark Kettenis <kettenis@cvs.openbsd.org> | 2020-10-22 15:54:11 +0000 |
|---|---|---|
| committer | Mark Kettenis <kettenis@cvs.openbsd.org> | 2020-10-22 15:54:11 +0000 |
| commit | c720b5d2e4279c73cfd01f3e745788acb0fee9ae (patch) | |
| tree | d31f2da4668d4de70976e5e17ab48665f1ff8aab | |
| parent | 7ef2eb8c932d0ca12083143b729c293afae8746d (diff) | |
Use the DBZ instruction to zero memory a cache line at a time.
This is what we already do on powerpc and seems to be what everybody
does for 64-bit POWER systems.
ok deraadt@, patrick@
| -rw-r--r-- | sys/arch/powerpc64/powerpc64/pmap.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sys/arch/powerpc64/powerpc64/pmap.c b/sys/arch/powerpc64/powerpc64/pmap.c index 4c54bb5dd89..ab479cdfcd1 100644 --- a/sys/arch/powerpc64/powerpc64/pmap.c +++ b/sys/arch/powerpc64/powerpc64/pmap.c @@ -1,4 +1,4 @@ -/* $OpenBSD: pmap.c,v 1.51 2020/10/18 14:51:09 kettenis Exp $ */ +/* $OpenBSD: pmap.c,v 1.52 2020/10/22 15:54:10 kettenis Exp $ */ /* * Copyright (c) 2015 Martin Pieuchot @@ -1432,9 +1432,11 @@ pmap_zero_page(struct vm_page *pg) { paddr_t pa = VM_PAGE_TO_PHYS(pg); paddr_t va = zero_page + cpu_number() * PAGE_SIZE; + int offset; pmap_kenter_pa(va, pa, PROT_READ | PROT_WRITE); - memset((void *)va, 0, PAGE_SIZE); + for (offset = 0; offset < PAGE_SIZE; offset += cacheline_size) + __asm volatile ("dcbz 0, %0" :: "r"(va + offset)); pmap_kremove(va, PAGE_SIZE); } |