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Add a few comments to the Memory manager

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This commit is contained in:
TheASVigilante 2023-05-05 20:43:47 +02:00
parent 242e39dc4d
commit 5f88077406
2 changed files with 20 additions and 8 deletions
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10
app/src/main/cpp/skyline/kernel/memory.cpp
View File

@ -43,7 +43,7 @@ namespace skyline::kernel {
if ((firstChunk.state == memory::states::Unmapped) != isUnmapping)
needsReprotection = true;
// We edit the chunk's first half
// We reduce the size of the first half
firstChunk.size = static_cast<size_t>(newDesc.first - firstChunkBase->first);
chunks[firstChunkBase->first] = firstChunk;
@ -69,12 +69,13 @@ namespace skyline::kernel {
bool shouldInsert{true};
// We check if the new chunk and the first chunk is mergable
if (firstChunk.IsCompatible(newDesc.second)) {
shouldInsert = false;
firstChunk.size = static_cast<size_t>((newDesc.first + newDesc.second.size) - firstChunkBase->first);
chunks[firstChunkBase->first] = firstChunk;
} else if ((firstChunkBase->first + firstChunk.size) != newDesc.first) {
} else if ((firstChunkBase->first + firstChunk.size) != newDesc.first) { // If it's not mergable check if it needs resizing
firstChunk.size = static_cast<size_t>(newDesc.first - firstChunkBase->first);
chunks[firstChunkBase->first] = firstChunk;
@ -83,6 +84,7 @@ namespace skyline::kernel {
needsReprotection = true;
}
// We check if the new chunk and the last chunk is mergable
if (lastChunk.IsCompatible(newDesc.second)) {
u8 *oldBase{lastChunkBase->first};
chunks.erase(lastChunkBase);
@ -97,7 +99,7 @@ namespace skyline::kernel {
firstChunk.size = static_cast<size_t>((lastChunk.size + oldBase) - firstChunkBase->first);
chunks[firstChunkBase->first] = firstChunk;
}
} else if ((newDesc.first + newDesc.second.size) != lastChunkBase->first) {
} else if ((newDesc.first + newDesc.second.size) != lastChunkBase->first) { // If it's not mergable check if it needs resizing
lastChunk.size = static_cast<size_t>((lastChunk.size + lastChunkBase->first) - (newDesc.first + newDesc.second.size));
chunks.erase(lastChunkBase);
@ -377,7 +379,7 @@ namespace skyline::kernel {
if (!addressSpace.contains(addr)) [[unlikely]]
return std::nullopt;
auto chunkBase = chunks.lower_bound(addr);
auto chunkBase{chunks.lower_bound(addr)};
if (addr < chunkBase->first)
--chunkBase;

18
app/src/main/cpp/skyline/kernel/memory.h
View File

@ -63,7 +63,9 @@ namespace skyline {
* @url https://switchbrew.org/wiki/SVC#MemoryAttribute
*/
union MemoryAttribute {
/**
* @brief Initializes all atrributes to false
*/
constexpr MemoryAttribute() : value{} {}
constexpr explicit MemoryAttribute(u8 value) : value{value} {}
@ -259,7 +261,7 @@ namespace skyline {
/**
* @brief Mirrors a page-aligned mapping in the guest address space to the host address space
* @return A span to the host address space mirror mapped as RWX, unmapping it is the responsibility of the caller
* @return A span to the host address space mirror mapped as RW, unmapping it is the responsibility of the caller
* @note The supplied mapping **must** be page-aligned and inside the guest address space
*/
span<u8> CreateMirror(span<u8> mapping);
@ -267,7 +269,7 @@ namespace skyline {
/**
* @brief Mirrors multiple page-aligned mapping in the guest address space to the host address space
* @param totalSize The total size of all the regions to be mirrored combined
* @return A span to the host address space mirror mapped as RWX, unmapping it is the responsibility of the caller
* @return A span to the host address space mirror mapped as RW, unmapping it is the responsibility of the caller
* @note The supplied mapping **must** be page-aligned and inside the guest address space
* @note If a single mapping is mirrored, it is recommended to use CreateMirror instead
*/
@ -294,7 +296,7 @@ namespace skyline {
*/
std::optional<std::pair<u8 *, ChunkDescriptor>> GetChunk(u8 *addr);
// Various mapping functions for use by the guest
// Various mapping functions for use by the guest, argument validity must be checked by the caller
void MapCodeMemory(span<u8> memory, memory::Permission permission);
void MapMutableCodeMemory(span<u8> memory);
@ -322,8 +324,16 @@ namespace skyline {
*/
void FreeMemory(span<u8> memory);
/**
* Implements the memory manager side functionality of svcMapMemory
* @note Argument validity must be checked by the caller
*/
void SvcMapMemory(span<u8> source, span<u8> destination);
/**
* Implements the memory manager side functionality of svcUnmapMemory
* @note Argument validity must be checked by the caller
*/
void SvcUnmapMemory(span<u8> source, span<u8> destination);
/**