Kernel/Memory: Added a function to first a suitable guest address at which to allocate a region of a given size.

master
bunnei 2018-10-23 18:39:10 +07:00
parent ef7b2237d9
commit a609b6907a
2 changed files with 28 additions and 0 deletions

@ -143,6 +143,26 @@ ResultVal<VMManager::VMAHandle> VMManager::MapBackingMemory(VAddr target, u8* me
return MakeResult<VMAHandle>(MergeAdjacent(vma_handle));
}
ResultVal<VAddr> VMManager::FindFreeRegion(u64 size) const {
// Find the first Free VMA.
const VAddr base = GetASLRRegionBaseAddress();
const VMAHandle vma_handle = std::find_if(vma_map.begin(), vma_map.end(), [&](const auto& vma) {
if (vma.second.type != VMAType::Free)
return false;
const VAddr vma_end = vma.second.base + vma.second.size;
return vma_end > base && vma_end >= base + size;
});
if (vma_handle == vma_map.end()) {
// TODO(Subv): Find the correct error code here.
return ResultCode(-1);
}
const VAddr target = std::max(base, vma_handle->second.base);
return MakeResult<VAddr>(target);
}
ResultVal<VMManager::VMAHandle> VMManager::MapMMIO(VAddr target, PAddr paddr, u64 size,
MemoryState state,
Memory::MemoryHookPointer mmio_handler) {

@ -157,6 +157,14 @@ public:
*/
ResultVal<VMAHandle> MapBackingMemory(VAddr target, u8* memory, u64 size, MemoryState state);
/**
* Finds the first free address that can hold a region of the desired size.
*
* @param size Size of the desired region.
* @return The found free address.
*/
ResultVal<VAddr> FindFreeRegion(u64 size) const;
/**
* Maps a memory-mapped IO region at a given address.
*