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memory: Introduce address_space_lookup_region 

This introduces a wrapper for phys_page_find (before we complicate
address_space_translate with IOMMU translation).  This function will
also encapsulate locking and reference counting when we introduce
BQL-free dispatching.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jan Kiszka 2013-05-06 16:48:02 +02:00 committed by Paolo Bonzini
parent 3752a03648
commit 9f029603ab
1 changed files with 7 additions and 1 deletions
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8
exec.c
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@ -203,6 +203,12 @@ bool memory_region_is_unassigned(MemoryRegion *mr)
&& mr != &io_mem_watch;
}
static MemoryRegionSection *address_space_lookup_region(AddressSpace *as,
hwaddr addr)
{
return phys_page_find(as->dispatch, addr >> TARGET_PAGE_BITS);
}
MemoryRegionSection *address_space_translate(AddressSpace *as, hwaddr addr,
hwaddr *xlat, hwaddr *plen,
bool is_write)
@ -210,7 +216,7 @@ MemoryRegionSection *address_space_translate(AddressSpace *as, hwaddr addr,
MemoryRegionSection *section;
Int128 diff;
section = phys_page_find(as->dispatch, addr >> TARGET_PAGE_BITS);
section = address_space_lookup_region(as, addr);
/* Compute offset within MemoryRegionSection */
addr -= section->offset_within_address_space;