diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 42b4be9383..bbc2851685 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -36,6 +36,7 @@ set(SRCS
hle/kernel/shared_memory.cpp
hle/kernel/thread.cpp
hle/kernel/timer.cpp
+ hle/kernel/vm_manager.cpp
hle/service/ac_u.cpp
hle/service/act_u.cpp
hle/service/am_app.cpp
@@ -147,6 +148,7 @@ set(HEADERS
hle/kernel/shared_memory.h
hle/kernel/thread.h
hle/kernel/timer.h
+ hle/kernel/vm_manager.h
hle/result.h
hle/service/ac_u.h
hle/service/act_u.h
diff --git a/src/core/hle/kernel/vm_manager.cpp b/src/core/hle/kernel/vm_manager.cpp
new file mode 100644
index 0000000000..b2dd21542f
--- /dev/null
+++ b/src/core/hle/kernel/vm_manager.cpp
@@ -0,0 +1,245 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/assert.h"
+
+#include "core/hle/kernel/vm_manager.h"
+#include "core/memory_setup.h"
+
+namespace Kernel {
+
+bool VirtualMemoryArea::CanBeMergedWith(const VirtualMemoryArea& next) const {
+ ASSERT(base + size == next.base);
+ if (permissions != next.permissions ||
+ meminfo_state != next.meminfo_state ||
+ type != next.type) {
+ return false;
+ }
+ if (type == VMAType::AllocatedMemoryBlock &&
+ (backing_block != next.backing_block || offset + size != next.offset)) {
+ return false;
+ }
+ if (type == VMAType::BackingMemory && backing_memory + size != next.backing_memory) {
+ return false;
+ }
+ if (type == VMAType::MMIO && paddr + size != next.paddr) {
+ return false;
+ }
+ return true;
+}
+
+VMManager::VMManager() {
+ Reset();
+}
+
+void VMManager::Reset() {
+ vma_map.clear();
+
+ // Initialize the map with a single free region covering the entire managed space.
+ VirtualMemoryArea initial_vma;
+ initial_vma.size = MAX_ADDRESS;
+ vma_map.emplace(initial_vma.base, initial_vma);
+
+ UpdatePageTableForVMA(initial_vma);
+}
+
+VMManager::VMAHandle VMManager::FindVMA(VAddr target) const {
+ return std::prev(vma_map.upper_bound(target));
+}
+
+ResultVal<VMManager::VMAHandle> VMManager::MapMemoryBlock(VAddr target,
+ std::shared_ptr<std::vector<u8>> block, u32 offset, u32 size, MemoryState state) {
+ ASSERT(block != nullptr);
+ ASSERT(offset + size <= block->size());
+
+ // This is the appropriately sized VMA that will turn into our allocation.
+ CASCADE_RESULT(VMAIter vma_handle, CarveVMA(target, size));
+ VirtualMemoryArea& final_vma = vma_handle->second;
+ ASSERT(final_vma.size == size);
+
+ final_vma.type = VMAType::AllocatedMemoryBlock;
+ final_vma.permissions = VMAPermission::ReadWrite;
+ final_vma.meminfo_state = state;
+ final_vma.backing_block = block;
+ final_vma.offset = offset;
+ UpdatePageTableForVMA(final_vma);
+
+ return MakeResult<VMAHandle>(MergeAdjacent(vma_handle));
+}
+
+ResultVal<VMManager::VMAHandle> VMManager::MapBackingMemory(VAddr target, u8 * memory, u32 size, MemoryState state) {
+ ASSERT(memory != nullptr);
+
+ // This is the appropriately sized VMA that will turn into our allocation.
+ CASCADE_RESULT(VMAIter vma_handle, CarveVMA(target, size));
+ VirtualMemoryArea& final_vma = vma_handle->second;
+ ASSERT(final_vma.size == size);
+
+ final_vma.type = VMAType::BackingMemory;
+ final_vma.permissions = VMAPermission::ReadWrite;
+ final_vma.meminfo_state = state;
+ final_vma.backing_memory = memory;
+ UpdatePageTableForVMA(final_vma);
+
+ return MakeResult<VMAHandle>(MergeAdjacent(vma_handle));
+}
+
+ResultVal<VMManager::VMAHandle> VMManager::MapMMIO(VAddr target, PAddr paddr, u32 size, MemoryState state) {
+ // This is the appropriately sized VMA that will turn into our allocation.
+ CASCADE_RESULT(VMAIter vma_handle, CarveVMA(target, size));
+ VirtualMemoryArea& final_vma = vma_handle->second;
+ ASSERT(final_vma.size == size);
+
+ final_vma.type = VMAType::MMIO;
+ final_vma.permissions = VMAPermission::ReadWrite;
+ final_vma.meminfo_state = state;
+ final_vma.paddr = paddr;
+ UpdatePageTableForVMA(final_vma);
+
+ return MakeResult<VMAHandle>(MergeAdjacent(vma_handle));
+}
+
+void VMManager::Unmap(VMAHandle vma_handle) {
+ VMAIter iter = StripIterConstness(vma_handle);
+
+ VirtualMemoryArea& vma = iter->second;
+ vma.type = VMAType::Free;
+ vma.permissions = VMAPermission::None;
+ vma.meminfo_state = MemoryState::Free;
+
+ vma.backing_block = nullptr;
+ vma.offset = 0;
+ vma.backing_memory = nullptr;
+ vma.paddr = 0;
+
+ UpdatePageTableForVMA(vma);
+
+ MergeAdjacent(iter);
+}
+
+void VMManager::Reprotect(VMAHandle vma_handle, VMAPermission new_perms) {
+ VMAIter iter = StripIterConstness(vma_handle);
+
+ VirtualMemoryArea& vma = iter->second;
+ vma.permissions = new_perms;
+ UpdatePageTableForVMA(vma);
+
+ MergeAdjacent(iter);
+}
+
+VMManager::VMAIter VMManager::StripIterConstness(const VMAHandle & iter) {
+ // This uses a neat C++ trick to convert a const_iterator to a regular iterator, given
+ // non-const access to its container.
+ return vma_map.erase(iter, iter); // Erases an empty range of elements
+}
+
+ResultVal<VMManager::VMAIter> VMManager::CarveVMA(VAddr base, u32 size) {
+ ASSERT_MSG((size & Memory::PAGE_MASK) == 0, "non-page aligned size: %8X", size);
+ ASSERT_MSG((base & Memory::PAGE_MASK) == 0, "non-page aligned base: %08X", base);
+
+ VMAIter vma_handle = StripIterConstness(FindVMA(base));
+ if (vma_handle == vma_map.end()) {
+ // Target address is outside the range managed by the kernel
+ return ResultCode(ErrorDescription::InvalidAddress, ErrorModule::OS,
+ ErrorSummary::InvalidArgument, ErrorLevel::Usage); // 0xE0E01BF5
+ }
+
+ VirtualMemoryArea& vma = vma_handle->second;
+ if (vma.type != VMAType::Free) {
+ // Region is already allocated
+ return ResultCode(ErrorDescription::InvalidAddress, ErrorModule::OS,
+ ErrorSummary::InvalidState, ErrorLevel::Usage); // 0xE0A01BF5
+ }
+
+ u32 start_in_vma = base - vma.base;
+ u32 end_in_vma = start_in_vma + size;
+
+ if (end_in_vma > vma.size) {
+ // Requested allocation doesn't fit inside VMA
+ return ResultCode(ErrorDescription::InvalidAddress, ErrorModule::OS,
+ ErrorSummary::InvalidState, ErrorLevel::Usage); // 0xE0A01BF5
+ }
+
+ if (end_in_vma != vma.size) {
+ // Split VMA at the end of the allocated region
+ SplitVMA(vma_handle, end_in_vma);
+ }
+ if (start_in_vma != 0) {
+ // Split VMA at the start of the allocated region
+ vma_handle = SplitVMA(vma_handle, start_in_vma);
+ }
+
+ return MakeResult<VMAIter>(vma_handle);
+}
+
+VMManager::VMAIter VMManager::SplitVMA(VMAIter vma_handle, u32 offset_in_vma) {
+ VirtualMemoryArea& old_vma = vma_handle->second;
+ VirtualMemoryArea new_vma = old_vma; // Make a copy of the VMA
+
+ // For now, don't allow no-op VMA splits (trying to split at a boundary) because it's probably
+ // a bug. This restriction might be removed later.
+ ASSERT(offset_in_vma < old_vma.size);
+ ASSERT(offset_in_vma > 0);
+
+ old_vma.size = offset_in_vma;
+ new_vma.base += offset_in_vma;
+ new_vma.size -= offset_in_vma;
+
+ switch (new_vma.type) {
+ case VMAType::Free:
+ break;
+ case VMAType::AllocatedMemoryBlock:
+ new_vma.offset += offset_in_vma;
+ break;
+ case VMAType::BackingMemory:
+ new_vma.backing_memory += offset_in_vma;
+ break;
+ case VMAType::MMIO:
+ new_vma.paddr += offset_in_vma;
+ break;
+ }
+
+ ASSERT(old_vma.CanBeMergedWith(new_vma));
+
+ return vma_map.emplace_hint(std::next(vma_handle), new_vma.base, new_vma);
+}
+
+VMManager::VMAIter VMManager::MergeAdjacent(VMAIter iter) {
+ VMAIter next_vma = std::next(iter);
+ if (next_vma != vma_map.end() && iter->second.CanBeMergedWith(next_vma->second)) {
+ iter->second.size += next_vma->second.size;
+ vma_map.erase(next_vma);
+ }
+
+ if (iter != vma_map.begin()) {
+ VMAIter prev_vma = std::prev(iter);
+ if (prev_vma->second.CanBeMergedWith(iter->second)) {
+ prev_vma->second.size += iter->second.size;
+ vma_map.erase(iter);
+ iter = prev_vma;
+ }
+ }
+
+ return iter;
+}
+
+void VMManager::UpdatePageTableForVMA(const VirtualMemoryArea& vma) {
+ switch (vma.type) {
+ case VMAType::Free:
+ Memory::UnmapRegion(vma.base, vma.size);
+ break;
+ case VMAType::AllocatedMemoryBlock:
+ Memory::MapMemoryRegion(vma.base, vma.size, vma.backing_block->data() + vma.offset);
+ break;
+ case VMAType::BackingMemory:
+ Memory::MapMemoryRegion(vma.base, vma.size, vma.backing_memory);
+ break;
+ case VMAType::MMIO:
+ // TODO(yuriks): Add support for MMIO handlers.
+ Memory::MapIoRegion(vma.base, vma.size);
+ break;
+ }
+}
+
+}
diff --git a/src/core/hle/kernel/vm_manager.h b/src/core/hle/kernel/vm_manager.h
new file mode 100644
index 0000000000..22b7246039
--- /dev/null
+++ b/src/core/hle/kernel/vm_manager.h
@@ -0,0 +1,200 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "common/common_types.h"
+
+#include "core/hle/result.h"
+
+namespace Kernel {
+
+enum class VMAType : u8 {
+ /// VMA represents an unmapped region of the address space.
+ Free,
+ /// VMA is backed by a ref-counted allocate memory block.
+ AllocatedMemoryBlock,
+ /// VMA is backed by a raw, unmanaged pointer.
+ BackingMemory,
+ /// VMA is mapped to MMIO registers at a fixed PAddr.
+ MMIO,
+ // TODO(yuriks): Implement MemoryAlias to support MAP/UNMAP
+};
+
+/// Permissions for mapped memory blocks
+enum class VMAPermission : u8 {
+ None = 0,
+ Read = 1,
+ Write = 2,
+ Execute = 4,
+
+ ReadWrite = Read | Write,
+ ReadExecute = Read | Execute,
+ WriteExecute = Write | Execute,
+ ReadWriteExecute = Read | Write | Execute,
+};
+
+/// Set of values returned in MemoryInfo.state by svcQueryMemory.
+enum class MemoryState : u8 {
+ Free = 0,
+ Reserved = 1,
+ IO = 2,
+ Static = 3,
+ Code = 4,
+ Private = 5,
+ Shared = 6,
+ Continuous = 7,
+ Aliased = 8,
+ Alias = 9,
+ AliasCode = 10,
+ Locked = 11,
+};
+
+/**
+ * Represents a VMA in an address space. A VMA is a contiguous region of virtual addressing space
+ * with homogeneous attributes across its extents. In this particular implementation each VMA is
+ * also backed by a single host memory allocation.
+ */
+struct VirtualMemoryArea {
+ /// Virtual base address of the region.
+ VAddr base = 0;
+ /// Size of the region.
+ u32 size = 0;
+
+ VMAType type = VMAType::Free;
+ VMAPermission permissions = VMAPermission::None;
+ /// Tag returned by svcQueryMemory. Not otherwise used.
+ MemoryState meminfo_state = MemoryState::Free;
+
+ // Settings for type = AllocatedMemoryBlock
+ /// Memory block backing this VMA.
+ std::shared_ptr<std::vector<u8>> backing_block = nullptr;
+ /// Offset into the backing_memory the mapping starts from.
+ u32 offset = 0;
+
+ // Settings for type = BackingMemory
+ /// Pointer backing this VMA. It will not be destroyed or freed when the VMA is removed.
+ u8* backing_memory = nullptr;
+
+ // Settings for type = MMIO
+ /// Physical address of the register area this VMA maps to.
+ PAddr paddr = 0;
+
+ /// Tests if this area can be merged to the right with `next`.
+ bool CanBeMergedWith(const VirtualMemoryArea& next) const;
+};
+
+/**
+ * Manages a process' virtual addressing space. This class maintains a list of allocated and free
+ * regions in the address space, along with their attributes, and allows kernel clients to
+ * manipulate it, adjusting the page table to match.
+ *
+ * This is similar in idea and purpose to the VM manager present in operating system kernels, with
+ * the main difference being that it doesn't have to support swapping or memory mapping of files.
+ * The implementation is also simplified by not having to allocate page frames. See these articles
+ * about the Linux kernel for an explantion of the concept and implementation:
+ * - http://duartes.org/gustavo/blog/post/how-the-kernel-manages-your-memory/
+ * - http://duartes.org/gustavo/blog/post/page-cache-the-affair-between-memory-and-files/
+ */
+class VMManager {
+ // TODO(yuriks): Make page tables switchable to support multiple VMManagers
+public:
+ /**
+ * The maximum amount of address space managed by the kernel. Addresses above this are never used.
+ * @note This is the limit used by the New 3DS kernel. Old 3DS used 0x20000000.
+ */
+ static const u32 MAX_ADDRESS = 0x40000000;
+
+ /**
+ * A map covering the entirety of the managed address space, keyed by the `base` field of each
+ * VMA. It must always be modified by splitting or merging VMAs, so that the invariant
+ * `elem.base + elem.size == next.base` is preserved, and mergeable regions must always be
+ * merged when possible so that no two similar and adjacent regions exist that have not been
+ * merged.
+ */
+ std::map<VAddr, VirtualMemoryArea> vma_map;
+ using VMAHandle = decltype(vma_map)::const_iterator;
+
+ VMManager();
+
+ /// Clears the address space map, re-initializing with a single free area.
+ void Reset();
+
+ /// Finds the VMA in which the given address is included in, or `vma_map.end()`.
+ VMAHandle FindVMA(VAddr target) const;
+
+ // TODO(yuriks): Should these functions actually return the handle?
+
+ /**
+ * Maps part of a ref-counted block of memory at a given address.
+ *
+ * @param target The guest address to start the mapping at.
+ * @param block The block to be mapped.
+ * @param offset Offset into `block` to map from.
+ * @param size Size of the mapping.
+ * @param state MemoryState tag to attach to the VMA.
+ */
+ ResultVal<VMAHandle> MapMemoryBlock(VAddr target, std::shared_ptr<std::vector<u8>> block,
+ u32 offset, u32 size, MemoryState state);
+
+ /**
+ * Maps an unmanaged host memory pointer at a given address.
+ *
+ * @param target The guest address to start the mapping at.
+ * @param memory The memory to be mapped.
+ * @param size Size of the mapping.
+ * @param state MemoryState tag to attach to the VMA.
+ */
+ ResultVal<VMAHandle> MapBackingMemory(VAddr target, u8* memory, u32 size, MemoryState state);
+
+ /**
+ * Maps a memory-mapped IO region at a given address.
+ *
+ * @param target The guest address to start the mapping at.
+ * @param paddr The physical address where the registers are present.
+ * @param size Size of the mapping.
+ * @param state MemoryState tag to attach to the VMA.
+ */
+ ResultVal<VMAHandle> MapMMIO(VAddr target, PAddr paddr, u32 size, MemoryState state);
+
+ /// Unmaps the given VMA.
+ void Unmap(VMAHandle vma);
+
+ /// Changes the permissions of the given VMA.
+ void Reprotect(VMAHandle vma, VMAPermission new_perms);
+
+private:
+ using VMAIter = decltype(vma_map)::iterator;
+
+ /// Converts a VMAHandle to a mutable VMAIter.
+ VMAIter StripIterConstness(const VMAHandle& iter);
+
+ /**
+ * Carves a VMA of a specific size at the specified address by splitting Free VMAs while doing
+ * the appropriate error checking.
+ */
+ ResultVal<VMAIter> CarveVMA(VAddr base, u32 size);
+
+ /**
+ * Splits a VMA in two, at the specified offset.
+ * @returns the right side of the split, with the original iterator becoming the left side.
+ */
+ VMAIter SplitVMA(VMAIter vma, u32 offset_in_vma);
+
+ /**
+ * Checks for and merges the specified VMA with adjacent ones if possible.
+ * @returns the merged VMA or the original if no merging was possible.
+ */
+ VMAIter MergeAdjacent(VMAIter vma);
+
+ /// Updates the pages corresponding to this VMA so they match the VMA's attributes.
+ void UpdatePageTableForVMA(const VirtualMemoryArea& vma);
+};
+
+}
diff --git a/src/core/mem_map.cpp b/src/core/mem_map.cpp
index 5ecec95660..bf814b945a 100644
--- a/src/core/mem_map.cpp
+++ b/src/core/mem_map.cpp
@@ -8,6 +8,10 @@
#include "common/logging/log.h"
#include "core/hle/config_mem.h"
+#include "core/hle/kernel/kernel.h"
+#include "core/hle/kernel/shared_memory.h"
+#include "core/hle/kernel/vm_manager.h"
+#include "core/hle/result.h"
#include "core/hle/shared_page.h"
#include "core/mem_map.h"
#include "core/memory.h"
@@ -17,31 +21,23 @@
namespace Memory {
-u8* g_exefs_code; ///< ExeFS:/.code is loaded here
-u8* g_heap; ///< Application heap (main memory)
-u8* g_shared_mem; ///< Shared memory
-u8* g_heap_linear; ///< Linear heap
-u8* g_vram; ///< Video memory (VRAM) pointer
-u8* g_dsp_mem; ///< DSP memory
-u8* g_tls_mem; ///< TLS memory
-
namespace {
struct MemoryArea {
- u8** ptr;
u32 base;
u32 size;
+ const char* name;
};
// We don't declare the IO regions in here since its handled by other means.
static MemoryArea memory_areas[] = {
- {&g_exefs_code, PROCESS_IMAGE_VADDR, PROCESS_IMAGE_MAX_SIZE},
- {&g_heap, HEAP_VADDR, HEAP_SIZE },
- {&g_shared_mem, SHARED_MEMORY_VADDR, SHARED_MEMORY_SIZE },
- {&g_heap_linear, LINEAR_HEAP_VADDR, LINEAR_HEAP_SIZE },
- {&g_vram, VRAM_VADDR, VRAM_SIZE },
- {&g_dsp_mem, DSP_RAM_VADDR, DSP_RAM_SIZE },
- {&g_tls_mem, TLS_AREA_VADDR, TLS_AREA_SIZE },
+ {PROCESS_IMAGE_VADDR, PROCESS_IMAGE_MAX_SIZE, "Process Image"}, // ExeFS:/.code is loaded here
+ {HEAP_VADDR, HEAP_SIZE, "Heap"}, // Application heap (main memory)
+ {SHARED_MEMORY_VADDR, SHARED_MEMORY_SIZE, "Shared Memory"}, // Shared memory
+ {LINEAR_HEAP_VADDR, LINEAR_HEAP_SIZE, "Linear Heap"}, // Linear heap (main memory)
+ {VRAM_VADDR, VRAM_SIZE, "VRAM"}, // Video memory (VRAM)
+ {DSP_RAM_VADDR, DSP_RAM_SIZE, "DSP RAM"}, // DSP memory
+ {TLS_AREA_VADDR, TLS_AREA_SIZE, "TLS Area"}, // TLS memory
};
/// Represents a block of memory mapped by ControlMemory/MapMemoryBlock
@@ -135,27 +131,34 @@ VAddr PhysicalToVirtualAddress(const PAddr addr) {
return addr | 0x80000000;
}
+// TODO(yuriks): Move this into Process
+static Kernel::VMManager address_space;
+
void Init() {
+ using namespace Kernel;
+
InitMemoryMap();
for (MemoryArea& area : memory_areas) {
- *area.ptr = new u8[area.size];
- MapMemoryRegion(area.base, area.size, *area.ptr);
+ auto block = std::make_shared<std::vector<u8>>(area.size);
+ address_space.MapMemoryBlock(area.base, std::move(block), 0, area.size, MemoryState::Private).Unwrap();
}
- MapMemoryRegion(CONFIG_MEMORY_VADDR, CONFIG_MEMORY_SIZE, (u8*)&ConfigMem::config_mem);
- MapMemoryRegion(SHARED_PAGE_VADDR, SHARED_PAGE_SIZE, (u8*)&SharedPage::shared_page);
- LOG_DEBUG(HW_Memory, "initialized OK, RAM at %p", g_heap);
+ auto cfg_mem_vma = address_space.MapBackingMemory(CONFIG_MEMORY_VADDR,
+ (u8*)&ConfigMem::config_mem, CONFIG_MEMORY_SIZE, MemoryState::Shared).MoveFrom();
+ address_space.Reprotect(cfg_mem_vma, VMAPermission::Read);
+
+ auto shared_page_vma = address_space.MapBackingMemory(SHARED_PAGE_VADDR,
+ (u8*)&SharedPage::shared_page, SHARED_PAGE_SIZE, MemoryState::Shared).MoveFrom();
+ address_space.Reprotect(shared_page_vma, VMAPermission::Read);
+
+ LOG_DEBUG(HW_Memory, "initialized OK");
}
void Shutdown() {
heap_map.clear();
heap_linear_map.clear();
-
- for (MemoryArea& area : memory_areas) {
- delete[] *area.ptr;
- *area.ptr = nullptr;
- }
+ address_space.Reset();
LOG_DEBUG(HW_Memory, "shutdown OK");
}
diff --git a/src/core/mem_map.h b/src/core/mem_map.h
index 945815cd62..ba50914a8d 100644
--- a/src/core/mem_map.h
+++ b/src/core/mem_map.h
@@ -8,14 +8,6 @@
namespace Memory {
-extern u8* g_exefs_code; ///< ExeFS:/.code is loaded here
-extern u8* g_heap; ///< Application heap (main memory)
-extern u8* g_shared_mem; ///< Shared memory
-extern u8* g_heap_linear; ///< Linear heap (main memory)
-extern u8* g_vram; ///< Video memory (VRAM)
-extern u8* g_dsp_mem; ///< DSP memory
-extern u8* g_tls_mem; ///< TLS memory
-
void Init();
void Shutdown();
diff --git a/src/core/memory.cpp b/src/core/memory.cpp
index 5d8069acd5..28844a9154 100644
--- a/src/core/memory.cpp
+++ b/src/core/memory.cpp
@@ -14,12 +14,10 @@
#include "core/hw/hw.h"
#include "core/mem_map.h"
#include "core/memory.h"
+#include "core/memory_setup.h"
namespace Memory {
-const u32 PAGE_MASK = PAGE_SIZE - 1;
-const int PAGE_BITS = 12;
-
enum class PageType {
/// Page is unmapped and should cause an access error.
Unmapped,
@@ -64,7 +62,7 @@ static void MapPages(u32 base, u32 size, u8* memory, PageType type) {
while (base != end) {
ASSERT_MSG(base < PageTable::NUM_ENTRIES, "out of range mapping at %08X", base);
- if (current_page_table->attributes[base] != PageType::Unmapped) {
+ if (current_page_table->attributes[base] != PageType::Unmapped && type != PageType::Unmapped) {
LOG_ERROR(HW_Memory, "overlapping memory ranges at %08X", base * PAGE_SIZE);
}
current_page_table->attributes[base] = type;
@@ -92,6 +90,12 @@ void MapIoRegion(VAddr base, u32 size) {
MapPages(base / PAGE_SIZE, size / PAGE_SIZE, nullptr, PageType::Special);
}
+void UnmapRegion(VAddr base, u32 size) {
+ ASSERT_MSG((size & PAGE_MASK) == 0, "non-page aligned size: %08X", size);
+ ASSERT_MSG((base & PAGE_MASK) == 0, "non-page aligned base: %08X", base);
+ MapPages(base / PAGE_SIZE, size / PAGE_SIZE, nullptr, PageType::Unmapped);
+}
+
template <typename T>
T Read(const VAddr vaddr) {
const u8* page_pointer = current_page_table->pointers[vaddr >> PAGE_BITS];
diff --git a/src/core/memory_setup.h b/src/core/memory_setup.h
index 46263495f2..361bfc816c 100644
--- a/src/core/memory_setup.h
+++ b/src/core/memory_setup.h
@@ -6,8 +6,13 @@
#include "common/common_types.h"
+#include "core/memory.h"
+
namespace Memory {
+const u32 PAGE_MASK = PAGE_SIZE - 1;
+const int PAGE_BITS = 12;
+
void InitMemoryMap();
/**
@@ -26,4 +31,6 @@ void MapMemoryRegion(VAddr base, u32 size, u8* target);
*/
void MapIoRegion(VAddr base, u32 size);
+void UnmapRegion(VAddr base, u32 size);
+
}