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memory: introduce memory_region_set_alias_offset()

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Add an API to update an alias offset of an active alias.  This can be
used to simplify implementation of dynamic memory banks.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2011-12-04 19:16:50 +02:00
parent 2282e1af40
commit 4703359e0e
2 changed files with 26 additions and 0 deletions
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14
memory.c
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@ -1345,6 +1345,20 @@ void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr)
memory_region_transaction_commit();
}
void memory_region_set_alias_offset(MemoryRegion *mr, target_phys_addr_t offset)
{
target_phys_addr_t old_offset = mr->alias_offset;
assert(mr->alias);
mr->alias_offset = offset;
if (offset == old_offset || !mr->parent) {
return;
}
memory_region_update_topology(mr);
}
void set_system_memory_map(MemoryRegion *mr)
{
address_space_memory.root = mr;