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diff --git a/src/common/address_space.inc b/src/common/address_space.inc
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+// SPDX-FileCopyrightText: 2021 Skyline Team and Contributors
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "common/address_space.h"
+#include "common/assert.h"
+
+#define MAP_MEMBER(returnType) \
+ template <typename VaType, VaType UnmappedVa, typename PaType, PaType UnmappedPa, \
+ bool PaContigSplit, size_t AddressSpaceBits, typename ExtraBlockInfo> \
+ requires AddressSpaceValid<VaType, AddressSpaceBits> returnType FlatAddressSpaceMap< \
+ VaType, UnmappedVa, PaType, UnmappedPa, PaContigSplit, AddressSpaceBits, ExtraBlockInfo>
+#define MAP_MEMBER_CONST() \
+ template <typename VaType, VaType UnmappedVa, typename PaType, PaType UnmappedPa, \
+ bool PaContigSplit, size_t AddressSpaceBits, typename ExtraBlockInfo> \
+ requires AddressSpaceValid<VaType, AddressSpaceBits> FlatAddressSpaceMap< \
+ VaType, UnmappedVa, PaType, UnmappedPa, PaContigSplit, AddressSpaceBits, ExtraBlockInfo>
+
+#define MM_MEMBER(returnType) \
+ template <typename VaType, VaType UnmappedVa, size_t AddressSpaceBits> \
+ requires AddressSpaceValid<VaType, AddressSpaceBits> returnType \
+ FlatMemoryManager<VaType, UnmappedVa, AddressSpaceBits>
+
+#define ALLOC_MEMBER(returnType) \
+ template <typename VaType, VaType UnmappedVa, size_t AddressSpaceBits> \
+ requires AddressSpaceValid<VaType, AddressSpaceBits> returnType \
+ FlatAllocator<VaType, UnmappedVa, AddressSpaceBits>
+#define ALLOC_MEMBER_CONST() \
+ template <typename VaType, VaType UnmappedVa, size_t AddressSpaceBits> \
+ requires AddressSpaceValid<VaType, AddressSpaceBits> \
+ FlatAllocator<VaType, UnmappedVa, AddressSpaceBits>
+
+namespace Common {
+MAP_MEMBER_CONST()::FlatAddressSpaceMap(VaType va_limit_,
+ std::function<void(VaType, VaType)> unmap_callback_)
+ : va_limit{va_limit_}, unmap_callback{std::move(unmap_callback_)} {
+ if (va_limit > VaMaximum) {
+ ASSERT_MSG(false, "Invalid VA limit!");
+ }
+}
+
+MAP_MEMBER(void)::MapLocked(VaType virt, PaType phys, VaType size, ExtraBlockInfo extra_info) {
+ VaType virt_end{virt + size};
+
+ if (virt_end > va_limit) {
+ ASSERT_MSG(false,
+ "Trying to map a block past the VA limit: virt_end: 0x{:X}, va_limit: 0x{:X}",
+ virt_end, va_limit);
+ }
+
+ auto block_end_successor{std::lower_bound(blocks.begin(), blocks.end(), virt_end)};
+ if (block_end_successor == blocks.begin()) {
+ ASSERT_MSG(false, "Trying to map a block before the VA start: virt_end: 0x{:X}", virt_end);
+ }
+
+ auto block_end_predecessor{std::prev(block_end_successor)};
+
+ if (block_end_successor != blocks.end()) {
+ // We have blocks in front of us, if one is directly in front then we don't have to add a
+ // tail
+ if (block_end_successor->virt != virt_end) {
+ PaType tailPhys{[&]() -> PaType {
+ if constexpr (!PaContigSplit) {
+ // Always propagate unmapped regions rather than calculating offset
+ return block_end_predecessor->phys;
+ } else {
+ if (block_end_predecessor->Unmapped()) {
+ // Always propagate unmapped regions rather than calculating offset
+ return block_end_predecessor->phys;
+ } else {
+ return block_end_predecessor->phys + virt_end - block_end_predecessor->virt;
+ }
+ }
+ }()};
+
+ if (block_end_predecessor->virt >= virt) {
+ // If this block's start would be overlapped by the map then reuse it as a tail
+ // block
+ block_end_predecessor->virt = virt_end;
+ block_end_predecessor->phys = tailPhys;
+ block_end_predecessor->extra_info = block_end_predecessor->extra_info;
+
+ // No longer predecessor anymore
+ block_end_successor = block_end_predecessor--;
+ } else {
+ // Else insert a new one and we're done
+ blocks.insert(block_end_successor,
+ {Block(virt, phys, extra_info),
+ Block(virt_end, tailPhys, block_end_predecessor->extra_info)});
+ if (unmap_callback) {
+ unmap_callback(virt, size);
+ }
+
+ return;
+ }
+ }
+ } else {
+ // block_end_predecessor will always be unmapped as blocks has to be terminated by an
+ // unmapped chunk
+ if (block_end_predecessor != blocks.begin() && block_end_predecessor->virt >= virt) {
+ // Move the unmapped block start backwards
+ block_end_predecessor->virt = virt_end;
+
+ // No longer predecessor anymore
+ block_end_successor = block_end_predecessor--;
+ } else {
+ // Else insert a new one and we're done
+ blocks.insert(block_end_successor,
+ {Block(virt, phys, extra_info), Block(virt_end, UnmappedPa, {})});
+ if (unmap_callback) {
+ unmap_callback(virt, size);
+ }
+
+ return;
+ }
+ }
+
+ auto block_start_successor{block_end_successor};
+
+ // Walk the block vector to find the start successor as this is more efficient than another
+ // binary search in most scenarios
+ while (std::prev(block_start_successor)->virt >= virt) {
+ block_start_successor--;
+ }
+
+ // Check that the start successor is either the end block or something in between
+ if (block_start_successor->virt > virt_end) {
+ ASSERT_MSG(false, "Unsorted block in AS map: virt: 0x{:X}", block_start_successor->virt);
+ } else if (block_start_successor->virt == virt_end) {
+ // We need to create a new block as there are none spare that we would overwrite
+ blocks.insert(block_start_successor, Block(virt, phys, extra_info));
+ } else {
+ // Erase overwritten blocks
+ if (auto eraseStart{std::next(block_start_successor)}; eraseStart != block_end_successor) {
+ blocks.erase(eraseStart, block_end_successor);
+ }
+
+ // Reuse a block that would otherwise be overwritten as a start block
+ block_start_successor->virt = virt;
+ block_start_successor->phys = phys;
+ block_start_successor->extra_info = extra_info;
+ }
+
+ if (unmap_callback) {
+ unmap_callback(virt, size);
+ }
+}
+
+MAP_MEMBER(void)::UnmapLocked(VaType virt, VaType size) {
+ VaType virt_end{virt + size};
+
+ if (virt_end > va_limit) {
+ ASSERT_MSG(false,
+ "Trying to map a block past the VA limit: virt_end: 0x{:X}, va_limit: 0x{:X}",
+ virt_end, va_limit);
+ }
+
+ auto block_end_successor{std::lower_bound(blocks.begin(), blocks.end(), virt_end)};
+ if (block_end_successor == blocks.begin()) {
+ ASSERT_MSG(false, "Trying to unmap a block before the VA start: virt_end: 0x{:X}",
+ virt_end);
+ }
+
+ auto block_end_predecessor{std::prev(block_end_successor)};
+
+ auto walk_back_to_predecessor{[&](auto iter) {
+ while (iter->virt >= virt) {
+ iter--;
+ }
+
+ return iter;
+ }};
+
+ auto erase_blocks_with_end_unmapped{[&](auto unmappedEnd) {
+ auto block_start_predecessor{walk_back_to_predecessor(unmappedEnd)};
+ auto block_start_successor{std::next(block_start_predecessor)};
+
+ auto eraseEnd{[&]() {
+ if (block_start_predecessor->Unmapped()) {
+ // If the start predecessor is unmapped then we can erase everything in our region
+ // and be done
+ return std::next(unmappedEnd);
+ } else {
+ // Else reuse the end predecessor as the start of our unmapped region then erase all
+ // up to it
+ unmappedEnd->virt = virt;
+ return unmappedEnd;
+ }
+ }()};
+
+ // We can't have two unmapped regions after each other
+ if (eraseEnd != blocks.end() &&
+ (eraseEnd == block_start_successor ||
+ (block_start_predecessor->Unmapped() && eraseEnd->Unmapped()))) {
+ ASSERT_MSG(false, "Multiple contiguous unmapped regions are unsupported!");
+ }
+
+ blocks.erase(block_start_successor, eraseEnd);
+ }};
+
+ // We can avoid any splitting logic if these are the case
+ if (block_end_predecessor->Unmapped()) {
+ if (block_end_predecessor->virt > virt) {
+ erase_blocks_with_end_unmapped(block_end_predecessor);
+ }
+
+ if (unmap_callback) {
+ unmap_callback(virt, size);
+ }
+
+ return; // The region is unmapped, bail out early
+ } else if (block_end_successor->virt == virt_end && block_end_successor->Unmapped()) {
+ erase_blocks_with_end_unmapped(block_end_successor);
+
+ if (unmap_callback) {
+ unmap_callback(virt, size);
+ }
+
+ return; // The region is unmapped here and doesn't need splitting, bail out early
+ } else if (block_end_successor == blocks.end()) {
+ // This should never happen as the end should always follow an unmapped block
+ ASSERT_MSG(false, "Unexpected Memory Manager state!");
+ } else if (block_end_successor->virt != virt_end) {
+ // If one block is directly in front then we don't have to add a tail
+
+ // The previous block is mapped so we will need to add a tail with an offset
+ PaType tailPhys{[&]() {
+ if constexpr (PaContigSplit) {
+ return block_end_predecessor->phys + virt_end - block_end_predecessor->virt;
+ } else {
+ return block_end_predecessor->phys;
+ }
+ }()};
+
+ if (block_end_predecessor->virt >= virt) {
+ // If this block's start would be overlapped by the unmap then reuse it as a tail block
+ block_end_predecessor->virt = virt_end;
+ block_end_predecessor->phys = tailPhys;
+
+ // No longer predecessor anymore
+ block_end_successor = block_end_predecessor--;
+ } else {
+ blocks.insert(block_end_successor,
+ {Block(virt, UnmappedPa, {}),
+ Block(virt_end, tailPhys, block_end_predecessor->extra_info)});
+ if (unmap_callback) {
+ unmap_callback(virt, size);
+ }
+
+ // The previous block is mapped and ends before
+ return;
+ }
+ }
+
+ // Walk the block vector to find the start predecessor as this is more efficient than another
+ // binary search in most scenarios
+ auto block_start_predecessor{walk_back_to_predecessor(block_end_successor)};
+ auto block_start_successor{std::next(block_start_predecessor)};
+
+ if (block_start_successor->virt > virt_end) {
+ ASSERT_MSG(false, "Unsorted block in AS map: virt: 0x{:X}", block_start_successor->virt);
+ } else if (block_start_successor->virt == virt_end) {
+ // There are no blocks between the start and the end that would let us skip inserting a new
+ // one for head
+
+ // The previous block is may be unmapped, if so we don't need to insert any unmaps after it
+ if (block_start_predecessor->Mapped()) {
+ blocks.insert(block_start_successor, Block(virt, UnmappedPa, {}));
+ }
+ } else if (block_start_predecessor->Unmapped()) {
+ // If the previous block is unmapped
+ blocks.erase(block_start_successor, block_end_predecessor);
+ } else {
+ // Erase overwritten blocks, skipping the first one as we have written the unmapped start
+ // block there
+ if (auto eraseStart{std::next(block_start_successor)}; eraseStart != block_end_successor) {
+ blocks.erase(eraseStart, block_end_successor);
+ }
+
+ // Add in the unmapped block header
+ block_start_successor->virt = virt;
+ block_start_successor->phys = UnmappedPa;
+ }
+
+ if (unmap_callback)
+ unmap_callback(virt, size);
+}
+
+ALLOC_MEMBER_CONST()::FlatAllocator(VaType virt_start_, VaType va_limit_)
+ : Base{va_limit_}, virt_start{virt_start_}, current_linear_alloc_end{virt_start_} {}
+
+ALLOC_MEMBER(VaType)::Allocate(VaType size) {
+ std::scoped_lock lock(this->block_mutex);
+
+ VaType alloc_start{UnmappedVa};
+ VaType alloc_end{current_linear_alloc_end + size};
+
+ // Avoid searching backwards in the address space if possible
+ if (alloc_end >= current_linear_alloc_end && alloc_end <= this->va_limit) {
+ auto alloc_end_successor{
+ std::lower_bound(this->blocks.begin(), this->blocks.end(), alloc_end)};
+ if (alloc_end_successor == this->blocks.begin()) {
+ ASSERT_MSG(false, "First block in AS map is invalid!");
+ }
+
+ auto alloc_end_predecessor{std::prev(alloc_end_successor)};
+ if (alloc_end_predecessor->virt <= current_linear_alloc_end) {
+ alloc_start = current_linear_alloc_end;
+ } else {
+ // Skip over fixed any mappings in front of us
+ while (alloc_end_successor != this->blocks.end()) {
+ if (alloc_end_successor->virt - alloc_end_predecessor->virt < size ||
+ alloc_end_predecessor->Mapped()) {
+ alloc_start = alloc_end_predecessor->virt;
+ break;
+ }
+
+ alloc_end_predecessor = alloc_end_successor++;
+
+ // Use the VA limit to calculate if we can fit in the final block since it has no
+ // successor
+ if (alloc_end_successor == this->blocks.end()) {
+ alloc_end = alloc_end_predecessor->virt + size;
+
+ if (alloc_end >= alloc_end_predecessor->virt && alloc_end <= this->va_limit) {
+ alloc_start = alloc_end_predecessor->virt;
+ }
+ }
+ }
+ }
+ }
+
+ if (alloc_start != UnmappedVa) {
+ current_linear_alloc_end = alloc_start + size;
+ } else { // If linear allocation overflows the AS then find a gap
+ if (this->blocks.size() <= 2) {
+ ASSERT_MSG(false, "Unexpected allocator state!");
+ }
+
+ auto search_predecessor{this->blocks.begin()};
+ auto search_successor{std::next(search_predecessor)};
+
+ while (search_successor != this->blocks.end() &&
+ (search_successor->virt - search_predecessor->virt < size ||
+ search_predecessor->Mapped())) {
+ search_predecessor = search_successor++;
+ }
+
+ if (search_successor != this->blocks.end()) {
+ alloc_start = search_predecessor->virt;
+ } else {
+ return {}; // AS is full
+ }
+ }
+
+ this->MapLocked(alloc_start, true, size, {});
+ return alloc_start;
+}
+
+ALLOC_MEMBER(void)::AllocateFixed(VaType virt, VaType size) {
+ this->Map(virt, true, size);
+}
+
+ALLOC_MEMBER(void)::Free(VaType virt, VaType size) {
+ this->Unmap(virt, size);
+}
+} // namespace Common