From 2282e1af408db47bab0f900344c0ba0935835f48 Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Wed, 14 Sep 2011 12:10:12 +0300 Subject: memory: introduce memory_region_set_address() Allow changing the address of a memory region while it is in the memory hierarchy. Signed-off-by: Avi Kivity --- memory.c | 21 +++++++++++++++++++++ memory.h | 11 +++++++++++ 2 files changed, 32 insertions(+) diff --git a/memory.c b/memory.c index d0f90ca350..a080d210c1 100644 --- a/memory.c +++ b/memory.c @@ -1324,6 +1324,27 @@ void memory_region_set_enabled(MemoryRegion *mr, bool enabled) memory_region_update_topology(NULL); } +void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr) +{ + MemoryRegion *parent = mr->parent; + unsigned priority = mr->priority; + bool may_overlap = mr->may_overlap; + + if (addr == mr->addr || !parent) { + mr->addr = addr; + return; + } + + memory_region_transaction_begin(); + memory_region_del_subregion(parent, mr); + if (may_overlap) { + memory_region_add_subregion_overlap(parent, addr, mr, priority); + } else { + memory_region_add_subregion(parent, addr, mr); + } + memory_region_transaction_commit(); +} + void set_system_memory_map(MemoryRegion *mr) { address_space_memory.root = mr; diff --git a/memory.h b/memory.h index c6997c4ee3..db53422b2b 100644 --- a/memory.h +++ b/memory.h @@ -518,6 +518,17 @@ void memory_region_del_subregion(MemoryRegion *mr, */ void memory_region_set_enabled(MemoryRegion *mr, bool enabled); +/* + * memory_region_set_address: dynamically update the address of a region + * + * Dynamically updates the address of a region, relative to its parent. + * May be used on regions are currently part of a memory hierarchy. + * + * @mr: the region to be updated + * @addr: new address, relative to parent region + */ +void memory_region_set_address(MemoryRegion *mr, target_phys_addr_t addr); + /* Start a transaction; changes will be accumulated and made visible only * when the transaction ends. */ -- cgit v1.2.3