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Almost got a PoC

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wheremyfoodat 2024-11-29 23:56:29 +02:00
parent dbc0dfd7d9
commit 798a03131e
5 changed files with 756 additions and 1 deletions
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43
include/memory.hpp
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@ -3,6 +3,7 @@
#include <bitset>
#include <filesystem>
#include <fstream>
#include <memory>
#include <optional>
#include <vector>
@ -10,8 +11,9 @@
#include "crypto/aes_engine.hpp"
#include "handles.hpp"
#include "helpers.hpp"
#include "loader/ncsd.hpp"
#include "host_memory/host_memory.h"
#include "loader/3dsx.hpp"
#include "loader/ncsd.hpp"
#include "services/region_codes.hpp"
namespace PhysicalAddrs {
@ -141,6 +143,37 @@ public:
static constexpr u32 DSP_DATA_MEMORY_OFFSET = u32(256_KB);
private:
// We also use MMU-accelerated fastmem for fast memory emulation
// This means that we've got a 4GB memory arena which is organized the same way as the emulated 3DS' memory map
// And we can access this directly instead of calling the memory read/write functions, which would be slower
// Regions that are not mapped or can't be accelerated this way will segfault, and the caller (eg dynarmic), will
// handle this segfault and call the Slower memory read/write functions
bool useFastmem = false;
static constexpr size_t FASTMEM_FCRAM_OFFSET = 0; // Offset of FCRAM in the fastmem arena
static constexpr size_t FASTMEM_DSP_RAM_OFFSET = FASTMEM_FCRAM_OFFSET + FCRAM_SIZE; // Offset of DSP RAM
#ifdef PANDA3DS_HARDWARE_FASTMEM
std::unique_ptr<Common::HostMemory> arena;
void addFastmemView(u32 guestVaddr, size_t arenaOffset, size_t size, bool w, bool x = false) {
if (useFastmem) {
Common::MemoryPermission perms = Common::MemoryPermission::Read;
if (w) {
perms |= Common::MemoryPermission::Write;
}
if (x) {
//perms |= Common::MemoryPermission::Execute;
}
arena->Map(guestVaddr, arenaOffset, size, perms, false);
}
}
#else
void resetFastmemViews() {}
void addFastmemView(u32 guestVaddr, size_t arenaOffset, size_t size, bool r, bool w, bool x = false) {}
#endif
std::bitset<FCRAM_PAGE_COUNT> usedFCRAMPages;
std::optional<u32> findPaddr(u32 size);
u64 timeSince3DSEpoch();
@ -299,4 +332,12 @@ private:
bool allocateMainThreadStack(u32 size);
Regions getConsoleRegion();
void copySharedFont(u8* ptr, u32 vaddr);
#ifdef PANDA3DS_HARDWARE_FASTMEM
bool isFastmemEnabled() { return useFastmem; }
u8* getFastmemArenaBase() { return arena->VirtualBasePointer(); }
#else
bool isFastmemEnabled() { return false; }
u8* getFastmemArenaBase() { return nullptr; }
#endif
};