Author: ian
Date: Sun Apr 20 18:21:05 2014
New Revision: 264702
URL: http://svnweb.freebsd.org/changeset/base/264702
Log:
Remove uncessary cache and TLB maintenance ops.
- These were needed on armv4/5 (VIVT cache), not needed on armv6.
- The wbinv_all call can't be used on SMP systems; cache operations by
set/way are not broadcast to other cores.
- The TLB maintenance operations needed for pmap_growkernel() happen in
pmap_grow_l2_bucket(), so there's no need to flush all TLB entries at
the end.
- There may not be any need for the TLB flush at the beginning of
pmap_release(), but it's left in for now pending more investigation.
Pointed out by: Svatopluk Kraus <onw...@gmail.com>
Discussed with: cognet@
Modified:
head/sys/arm/arm/pmap-v6.c
Modified: head/sys/arm/arm/pmap-v6.c
==============================================================================
--- head/sys/arm/arm/pmap-v6.c Sun Apr 20 18:15:23 2014 (r264701)
+++ head/sys/arm/arm/pmap-v6.c Sun Apr 20 18:21:05 2014 (r264702)
@@ -1988,8 +1988,6 @@ pmap_release(pmap_t pmap)
{
struct pcb *pcb;
- cpu_idcache_wbinv_all();
- cpu_l2cache_wbinv_all();
cpu_tlb_flushID();
cpu_cpwait();
if (vector_page < KERNBASE) {
@@ -2175,14 +2173,6 @@ pmap_growkernel(vm_offset_t addr)
for (; pmap_curmaxkvaddr < addr; pmap_curmaxkvaddr += L1_S_SIZE)
pmap_grow_l2_bucket(kpmap, pmap_curmaxkvaddr);
- /*
- * flush out the cache, expensive but growkernel will happen so
- * rarely
- */
- cpu_dcache_wbinv_all();
- cpu_l2cache_wbinv_all();
- cpu_tlb_flushD();
- cpu_cpwait();
kernel_vm_end = pmap_curmaxkvaddr;
}
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