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nova: speedup clearing dataspace in core

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This commit is contained in:
Alexander Boettcher 2015-10-14 11:05:03 +02:00 committed by Christian Helmuth
parent ceb04d3c11
commit d6bae1a9a3
1 changed files with 8 additions and 1 deletions
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9
repos/base-nova/src/core/ram_session_support.cc
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@ -54,7 +54,14 @@ void Ram_session_component::_clear_ds(Dataspace_component *ds)
{
size_t page_rounded_size = align_addr(ds->size(), get_page_size_log2());
memset((void *)ds->core_local_addr(), 0, page_rounded_size);
size_t memset_count = page_rounded_size / 4;
addr_t memset_ptr = ds->core_local_addr();
if ((memset_count * 4 == page_rounded_size) && !(memset_ptr & 0x3))
asm volatile ("rep stosl" : "+D" (memset_ptr), "+c" (memset_count)
: "a" (0) : "memory");
else
memset(reinterpret_cast<void *>(memset_ptr), 0, page_rounded_size);
/* we don't keep any core-local mapping */
unmap_local(reinterpret_cast<Nova::Utcb *>(Thread_base::myself()->utcb()),