91 lines
3.0 KiB
C++
91 lines
3.0 KiB
C++
#include "lib/memory_mapping_tree.h"
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#include <glacier/string/str_format.h>
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#include "debug/debug.h"
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template <>
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void glcr::StrFormatValue(glcr::StringBuilder& builder,
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const MemoryMappingTree::MemoryMapping& value,
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glcr::StringView opts) {
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builder.PushBack(
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glcr::StrFormat("Range {x}-{x}", value.vaddr_base, value.vaddr_limit));
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}
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glcr::ErrorCode MemoryMappingTree::AddInMemoryObject(
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uint64_t vaddr, const glcr::RefPtr<MemoryObject>& object) {
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// TODO: This implementation is inefficient as it traverses the tree a lot, we
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// should have some solution with iterators to avoid this.
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auto predecessor_or = mapping_tree_.Predecessor(vaddr);
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if (predecessor_or && predecessor_or.value().get().vaddr_limit > vaddr) {
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return glcr::ALREADY_EXISTS;
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}
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if (mapping_tree_.Find(vaddr)) {
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return glcr::ALREADY_EXISTS;
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}
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auto successor_or = mapping_tree_.Successor(vaddr);
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if (successor_or &&
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successor_or.value().get().vaddr_base < vaddr + object->size()) {
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return glcr::ALREADY_EXISTS;
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}
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mapping_tree_.Insert(vaddr, MemoryMapping{
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.vaddr_base = vaddr,
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.vaddr_limit = vaddr + object->size(),
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.mem_object = object,
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});
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return glcr::OK;
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}
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glcr::ErrorCode MemoryMappingTree::FreeMemoryRange(uint64_t vaddr_base,
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uint64_t vaddr_limit) {
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if (vaddr_limit <= vaddr_base) {
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return glcr::INVALID_ARGUMENT;
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}
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auto predecessor_or = mapping_tree_.Predecessor(vaddr_base);
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if (predecessor_or && predecessor_or.value().get().vaddr_limit > vaddr_base) {
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return glcr::FAILED_PRECONDITION;
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}
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auto last_predecessor_or = mapping_tree_.Predecessor(vaddr_limit);
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if (last_predecessor_or &&
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last_predecessor_or.value().get().vaddr_limit > vaddr_limit) {
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return glcr::FAILED_PRECONDITION;
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}
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auto find_or = mapping_tree_.Find(vaddr_base);
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if (find_or) {
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mapping_tree_.Delete(vaddr_base);
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}
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while (true) {
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auto successor_or = mapping_tree_.Successor(vaddr_base);
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if (!successor_or || successor_or.value().get().vaddr_base >= vaddr_limit) {
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return glcr::OK;
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}
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mapping_tree_.Delete(successor_or.value().get().vaddr_base);
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}
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}
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glcr::ErrorOr<uint64_t> MemoryMappingTree::GetPhysicalPageAtVaddr(
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uint64_t vaddr) {
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auto mapping_or = GetMemoryMappingForAddr(vaddr);
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if (!mapping_or) {
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return glcr::NOT_FOUND;
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}
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MemoryMapping& mapping = mapping_or.value();
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return mapping.mem_object->PhysicalPageAtOffset(vaddr - mapping.vaddr_base);
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}
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glcr::Optional<glcr::Ref<MemoryMappingTree::MemoryMapping>>
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MemoryMappingTree::GetMemoryMappingForAddr(uint64_t vaddr) {
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auto mapping_or = mapping_tree_.Predecessor(vaddr + 1);
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if (!mapping_or) {
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return mapping_or;
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}
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MemoryMapping& mapping = mapping_or.value();
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if (mapping.vaddr_base + mapping.mem_object->size() <= vaddr) {
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return {};
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}
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return mapping_or;
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}
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