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kern: update Initialize0 for new arguments/randomization semantics

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This commit is contained in:
Michael Scire 2021-09-18 09:58:02 -07:00 • committed by SciresM
parent 2f2c36b22b
commit 481ce12b7b
13 changed files with 160 additions and 115 deletions
libraries/libmesosphere/source
kern_k_memory_layout.cpp

37
libraries/libmesosphere/source/kern_k_memory_layout.cpp
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@ -111,43 +111,6 @@ namespace ams::kern {
return true;
}
KVirtualAddress KMemoryRegionTree::GetRandomAlignedRegion(size_t size, size_t alignment, u32 type_id) {
/* We want to find the total extents of the type id. */
const auto extents = this->GetDerivedRegionExtents(type_id);
/* Ensure that our alignment is correct. */
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(extents.GetAddress(), alignment));
const uintptr_t first_address = extents.GetAddress();
const uintptr_t last_address = extents.GetLastAddress();
const uintptr_t first_index = first_address / alignment;
const uintptr_t last_index = last_address / alignment;
while (true) {
const uintptr_t candidate = KSystemControl::Init::GenerateRandomRange(first_index, last_index) * alignment;
/* Ensure that the candidate doesn't overflow with the size. */
if (!(candidate < candidate + size)) {
continue;
}
const uintptr_t candidate_last = candidate + size - 1;
/* Ensure that the candidate fits within the region. */
if (candidate_last > last_address) {
continue;
}
/* Locate the candidate region, and ensure it fits and has the correct type id. */
if (const auto &candidate_region = *this->Find(candidate); !(candidate_last <= candidate_region.GetLastAddress() && candidate_region.GetType() == type_id)) {
continue;
}
return candidate;
}
}
void KMemoryLayout::InitializeLinearMemoryRegionTrees() {
/* Initialize linear trees. */
for (auto &region : GetPhysicalMemoryRegionTree()) {