MirrorRepos/azahar
1
0
Fork 0
mirror of https://github.com/azahar-emu/azahar.git synced 2026-06-17 08:29:27 -04:00
Code Issues Projects Releases Packages Wiki Activity

core/memory: Fix undefined behavior and optimize Luma alias path (#2202)

Browse source 
* core/memory: Fix undefined behavior and optimize Luma alias path

* chore: clean up Luma mapping comments

* style: fix clang-format formatting
This commit is contained in:
0x48kirenh 2026-06-17 09:13:56 +02:00 • committed by GitHub
parent f015a208e5
commit 735c63174c
No known key found for this signature in database
GPG key ID: B5690EEEBB952194
1 changed files with 26 additions and 14 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

40
src/core/memory.cpp
View file

@ -598,19 +598,25 @@ T MemorySystem::Read(const std::shared_ptr<PageTable>& page_table, const VAddr v
return value;
}
// Custom Luma3ds mapping
// Is there a more efficient way to do this?
if (vaddr & (1 << 31)) {
PAddr paddr = (vaddr & ~(1 << 31));
if ((paddr & 0xF0000000) == Memory::FCRAM_PADDR) { // Check FCRAM region
// Custom Luma3ds mapping (bit 31 set) Bypasses page tables for FCRAM/MMIO
constexpr VAddr LUMA_ALIAS_BIT = 0x80000000u;
if (vaddr & LUMA_ALIAS_BIT) [[unlikely]] {
const PAddr paddr = vaddr & ~LUMA_ALIAS_BIT;
// FCRAM (0x2xxxxxxx)
if ((paddr & 0xF0000000) == Memory::FCRAM_PADDR) {
ReadType value;
std::memcpy(&value, GetFCRAMPointer(paddr - Memory::FCRAM_PADDR), read_size);
return value;
} else if ((paddr & 0xF0000000) == 0x10000000 &&
paddr >= Memory::IO_AREA_PADDR) { // Check MMIO region
}
// MMIO (0x1xxxxxxx, >= IO_AREA_PADDR) - Strictly 32-bit
if ((paddr & 0xF0000000) == 0x10000000 && paddr >= Memory::IO_AREA_PADDR) [[unlikely]] {
return static_cast<ReadType>(impl->system.GPU().ReadReg(
static_cast<VAddr>(paddr) - Memory::IO_AREA_PADDR + 0x1EC00000));
}
// Fallthrough: Standard page table lookup
}
PageType type = page_table->attributes[vaddr >> CITRA_PAGE_BITS];
@ -686,21 +692,27 @@ void MemorySystem::Write(const std::shared_ptr<PageTable>& page_table, const VAd
return;
}
// Custom Luma3ds mapping
// Is there a more efficient way to do this?
if (vaddr & (1 << 31)) {
PAddr paddr = (vaddr & ~(1 << 31));
if ((paddr & 0xF0000000) == Memory::FCRAM_PADDR) { // Check FCRAM region
// Custom Luma3ds mapping (bit 31 set) Bypasses page tables for FCRAM/MMIO
constexpr VAddr LUMA_ALIAS_BIT = 0x80000000u;
if (vaddr & LUMA_ALIAS_BIT) [[unlikely]] {
const PAddr paddr = vaddr & ~LUMA_ALIAS_BIT;
// FCRAM (0x2xxxxxxx)
if ((paddr & 0xF0000000) == Memory::FCRAM_PADDR) {
std::memcpy(GetFCRAMPointer(paddr - Memory::FCRAM_PADDR), &data, sizeof(T));
return;
} else if ((paddr & 0xF0000000) == 0x10000000 &&
paddr >= Memory::IO_AREA_PADDR) { // Check MMIO region
}
// MMIO (0x1xxxxxxx, >= IO_AREA_PADDR) - Strictly 32-bit
if ((paddr & 0xF0000000) == 0x10000000 && paddr >= Memory::IO_AREA_PADDR) [[unlikely]] {
ASSERT(sizeof(data) == sizeof(u32));
impl->system.GPU().WriteReg(static_cast<VAddr>(paddr) - Memory::IO_AREA_PADDR +
0x1EC00000,
static_cast<u32>(data));
return;
}
// Fallthrough: Standard page table lookup
}
PageType type = page_table->attributes[vaddr >> CITRA_PAGE_BITS];