From a040a152468bbd315781c3d50bea484c07e2e02a Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Wed, 8 Apr 2020 17:39:58 -0400
Subject: core: device_memory: Update to use VirtualBuffer class.

---
 src/core/device_memory.cpp | 38 +++++---------------------------------
 src/core/device_memory.h   | 13 +++++++------
 2 files changed, 12 insertions(+), 39 deletions(-)

diff --git a/src/core/device_memory.cpp b/src/core/device_memory.cpp
index 1e4187546..61429a6ac 100644
--- a/src/core/device_memory.cpp
+++ b/src/core/device_memory.cpp
@@ -2,49 +2,21 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#ifdef _WIN32
-#include <windows.h>
-#endif
-
-#include "common/assert.h"
 #include "core/core.h"
 #include "core/device_memory.h"
 #include "core/memory.h"
 
 namespace Core {
 
-constexpr u64 DramSize{4ULL * 1024 * 1024 * 1024};
-
-DeviceMemory::DeviceMemory(System& system) : system{system} {
-#ifdef _WIN32
-    base = static_cast<u8*>(
-        VirtualAlloc(nullptr,                                    // System selects address
-                     DramSize,                                   // Size of allocation
-                     MEM_RESERVE | MEM_COMMIT | MEM_WRITE_WATCH, // Allocate reserved pages
-                     PAGE_READWRITE));                           // Protection = no access
-#else
-    physical_memory.resize(DramSize);
-    base = physical_memory.data();
-#endif
-}
+DeviceMemory::DeviceMemory(System& system) : buffer{DramMemoryMap::Size}, system{system} {}
 
-DeviceMemory::~DeviceMemory() {
-#ifdef _WIN32
-    ASSERT(VirtualFree(base, DramSize, MEM_RELEASE));
-#endif
-}
+DeviceMemory::~DeviceMemory() = default;
 
 PAddr DeviceMemory::GetPhysicalAddr(VAddr addr) {
-    u8* pointer{system.Memory().GetPointer(addr)};
-    ASSERT(pointer);
-    const uintptr_t offset{static_cast<uintptr_t>(pointer - GetPointer(DramMemoryMap::Base))};
+    const u8* const base{system.Memory().GetPointer(addr)};
+    ASSERT(base);
+    const uintptr_t offset{static_cast<uintptr_t>(base - GetPointer(DramMemoryMap::Base))};
     return DramMemoryMap::Base + offset;
 }
 
-u8* DeviceMemory::GetPointer(PAddr addr) {
-    ASSERT(addr >= DramMemoryMap::Base);
-    ASSERT(addr < DramMemoryMap::Base + DramSize);
-    return base + (addr - DramMemoryMap::Base);
-}
-
 } // namespace Core
diff --git a/src/core/device_memory.h b/src/core/device_memory.h
index a60a7238a..44458c2b5 100644
--- a/src/core/device_memory.h
+++ b/src/core/device_memory.h
@@ -6,7 +6,7 @@
 
 #include "common/assert.h"
 #include "common/common_funcs.h"
-#include "core/hle/kernel/physical_memory.h"
+#include "common/virtual_buffer.h"
 
 namespace Core {
 
@@ -24,24 +24,25 @@ constexpr u64 SlabHeapEnd = SlabHeapBase + SlapHeapSize;
 
 class DeviceMemory : NonCopyable {
 public:
-    DeviceMemory(Core::System& system);
+    explicit DeviceMemory(Core::System& system);
     ~DeviceMemory();
 
     template <typename T>
     PAddr GetPhysicalAddr(T* ptr) {
         const auto ptr_addr{reinterpret_cast<uintptr_t>(ptr)};
-        const auto base_addr{reinterpret_cast<uintptr_t>(base)};
+        const auto base_addr{reinterpret_cast<uintptr_t>(buffer.data())};
         ASSERT(ptr_addr >= base_addr);
         return ptr_addr - base_addr + DramMemoryMap::Base;
     }
 
     PAddr GetPhysicalAddr(VAddr addr);
 
-    u8* GetPointer(PAddr addr);
+    constexpr u8* GetPointer(PAddr addr) {
+        return buffer.data() + (addr - DramMemoryMap::Base);
+    }
 
 private:
-    u8* base{};
-    Kernel::PhysicalMemory physical_memory;
+    Common::VirtualBuffer<u8> buffer;
     Core::System& system;
 };
 
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