diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index b5b129a097a1865b3f96458bee850dde17e6742a..11659c3c58b4beb5286e27195f690cd5107282e2 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -10,7 +10,6 @@ set(SRCS
logging/text_formatter.cpp
logging/backend.cpp
math_util.cpp
- mem_arena.cpp
memory_util.cpp
misc.cpp
profiler.cpp
@@ -43,7 +42,6 @@ set(HEADERS
logging/backend.h
make_unique.h
math_util.h
- mem_arena.h
memory_util.h
platform.h
profiler.h
diff --git a/src/common/mem_arena.cpp b/src/common/mem_arena.cpp
deleted file mode 100644
index 689fdb92b05c40af7c18e09bdf06c91bc6a65def..0000000000000000000000000000000000000000
--- a/src/common/mem_arena.cpp
+++ /dev/null
@@ -1,394 +0,0 @@
-// Copyright (C) 2003 Dolphin Project.
-
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, version 2.0 or later versions.
-
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License 2.0 for more details.
-
-// A copy of the GPL 2.0 should have been included with the program.
-// If not, see http://www.gnu.org/licenses/
-
-// Official SVN repository and contact information can be found at
-// http://code.google.com/p/dolphin-emu/
-
-#include <string>
-
-#include "common/logging/log.h"
-#include "common/mem_arena.h"
-#include "common/memory_util.h"
-#include "common/platform.h"
-#include "common/string_util.h"
-
-#ifndef _WIN32
-#include <fcntl.h>
-#include <string.h>
-#include <unistd.h>
-
-#ifdef ANDROID
-#include <sys/ioctl.h>
-#include <linux/ashmem.h>
-#endif
-#endif
-
-#ifdef ANDROID
-
-// Hopefully this ABI will never change...
-
-
-#define ASHMEM_DEVICE "/dev/ashmem"
-
-/*
-* ashmem_create_region - creates a new ashmem region and returns the file
-* descriptor, or <0 on error
-*
-* `name' is an optional label to give the region (visible in /proc/pid/maps)
-* `size' is the size of the region, in page-aligned bytes
-*/
-int ashmem_create_region(const char *name, size_t size)
-{
- int fd, ret;
-
- fd = open(ASHMEM_DEVICE, O_RDWR);
- if (fd < 0)
- return fd;
-
- if (name) {
- char buf[ASHMEM_NAME_LEN];
-
- strncpy(buf, name, sizeof(buf));
- ret = ioctl(fd, ASHMEM_SET_NAME, buf);
- if (ret < 0)
- goto error;
- }
-
- ret = ioctl(fd, ASHMEM_SET_SIZE, size);
- if (ret < 0)
- goto error;
-
- return fd;
-
-error:
- LOG_ERROR(Common_Memory, "NASTY ASHMEM ERROR: ret = %08x", ret);
- close(fd);
- return ret;
-}
-
-int ashmem_set_prot_region(int fd, int prot)
-{
- return ioctl(fd, ASHMEM_SET_PROT_MASK, prot);
-}
-
-int ashmem_pin_region(int fd, size_t offset, size_t len)
-{
- struct ashmem_pin pin = { offset, len };
- return ioctl(fd, ASHMEM_PIN, &pin);
-}
-
-int ashmem_unpin_region(int fd, size_t offset, size_t len)
-{
- struct ashmem_pin pin = { offset, len };
- return ioctl(fd, ASHMEM_UNPIN, &pin);
-}
-#endif // Android
-
-
-#if defined(_WIN32)
-SYSTEM_INFO sysInfo;
-#endif
-
-
-// Windows mappings need to be on 64K boundaries, due to Alpha legacy.
-#ifdef _WIN32
-size_t roundup(size_t x) {
- int gran = sysInfo.dwAllocationGranularity ? sysInfo.dwAllocationGranularity : 0x10000;
- return (x + gran - 1) & ~(gran - 1);
-}
-#else
-size_t roundup(size_t x) {
- return x;
-}
-#endif
-
-
-void MemArena::GrabLowMemSpace(size_t size)
-{
-#ifdef _WIN32
- hMemoryMapping = CreateFileMapping(INVALID_HANDLE_VALUE, nullptr, PAGE_READWRITE, 0, (DWORD)(size), nullptr);
- GetSystemInfo(&sysInfo);
-#elif defined(ANDROID)
- // Use ashmem so we don't have to allocate a file on disk!
- fd = ashmem_create_region("Citra_RAM", size);
- // Note that it appears that ashmem is pinned by default, so no need to pin.
- if (fd < 0)
- {
- LOG_ERROR(Common_Memory, "Failed to grab ashmem space of size: %08x errno: %d", (int)size, (int)(errno));
- return;
- }
-#else
- // Try to find a non-existing filename for our shared memory.
- // In most cases the first one will be available, but it's nicer to search
- // a bit more.
- for (int i = 0; i < 10000; i++)
- {
- std::string file_name = Common::StringFromFormat("/citramem.%d", i);
- fd = shm_open(file_name.c_str(), O_RDWR | O_CREAT | O_EXCL, 0600);
- if (fd != -1)
- {
- shm_unlink(file_name.c_str());
- break;
- }
- else if (errno != EEXIST)
- {
- LOG_ERROR(Common_Memory, "shm_open failed: %s", strerror(errno));
- return;
- }
- }
- if (ftruncate(fd, size) < 0)
- LOG_ERROR(Common_Memory, "Failed to allocate low memory space");
-#endif
-}
-
-
-void MemArena::ReleaseSpace()
-{
-#ifdef _WIN32
- CloseHandle(hMemoryMapping);
- hMemoryMapping = 0;
-#else
- close(fd);
-#endif
-}
-
-
-void *MemArena::CreateView(s64 offset, size_t size, void *base)
-{
-#ifdef _WIN32
- size = roundup(size);
- void *ptr = MapViewOfFileEx(hMemoryMapping, FILE_MAP_ALL_ACCESS, 0, (DWORD)((u64)offset), size, base);
- return ptr;
-#else
- void *retval = mmap(base, size, PROT_READ | PROT_WRITE, MAP_SHARED |
- // Do not sync memory to underlying file. Linux has this by default.
-#ifdef __FreeBSD__
- MAP_NOSYNC |
-#endif
- ((base == nullptr) ? 0 : MAP_FIXED), fd, offset);
-
- if (retval == MAP_FAILED)
- {
- LOG_ERROR(Common_Memory, "mmap failed");
- return nullptr;
- }
- return retval;
-#endif
-}
-
-
-void MemArena::ReleaseView(void* view, size_t size)
-{
-#ifdef _WIN32
- UnmapViewOfFile(view);
-#else
- munmap(view, size);
-#endif
-}
-
-u8* MemArena::Find4GBBase()
-{
-#if EMU_ARCH_BITS == 64
-#ifdef _WIN32
- // 64 bit
- u8* base = (u8*)VirtualAlloc(0, 0xE1000000, MEM_RESERVE, PAGE_READWRITE);
- VirtualFree(base, 0, MEM_RELEASE);
- return base;
-#else
- // Very precarious - mmap cannot return an error when trying to map already used pages.
- // This makes the Windows approach above unusable on Linux, so we will simply pray...
- return reinterpret_cast<u8*>(0x2300000000ULL);
-#endif
-
-#else // 32 bit
-
-#ifdef _WIN32
- u8* base = (u8*)VirtualAlloc(0, 0x10000000, MEM_RESERVE, PAGE_READWRITE);
- if (base) {
- VirtualFree(base, 0, MEM_RELEASE);
- }
- return base;
-#else
- void* base = mmap(0, 0x10000000, PROT_READ | PROT_WRITE,
- MAP_ANON | MAP_SHARED, -1, 0);
- if (base == MAP_FAILED) {
- LOG_ERROR(Common_Memory, "Failed to map 256 MB of memory space: %s", strerror(errno));
- return 0;
- }
- munmap(base, 0x10000000);
- return static_cast<u8*>(base);
-#endif
-#endif
-}
-
-
-// yeah, this could also be done in like two bitwise ops...
-#define SKIP(a_flags, b_flags)
-//if (!(a_flags & MV_WII_ONLY) && (b_flags & MV_WII_ONLY))
-// continue;
-//if (!(a_flags & MV_FAKE_VMEM) && (b_flags & MV_FAKE_VMEM))
-// continue;
-
-static bool Memory_TryBase(u8 *base, const MemoryView *views, int num_views, u32 flags, MemArena *arena) {
- // OK, we know where to find free space. Now grab it!
- // We just mimic the popular BAT setup.
- size_t position = 0;
- size_t last_position = 0;
-
- // Zero all the pointers to be sure.
- for (int i = 0; i < num_views; i++)
- {
- if (views[i].out_ptr_low)
- *views[i].out_ptr_low = 0;
- if (views[i].out_ptr)
- *views[i].out_ptr = 0;
- }
-
- int i;
- for (i = 0; i < num_views; i++)
- {
- const MemoryView &view = views[i];
- if (view.size == 0)
- continue;
- SKIP(flags, view.flags);
- if (view.flags & MV_MIRROR_PREVIOUS) {
- position = last_position;
- }
- else {
- *(view.out_ptr_low) = (u8*)arena->CreateView(position, view.size);
- if (!*view.out_ptr_low)
- goto bail;
- }
-#if EMU_ARCH_BITS == 64
- *view.out_ptr = (u8*)arena->CreateView(
- position, view.size, base + view.virtual_address);
-#else
- if (view.flags & MV_MIRROR_PREVIOUS) { // TODO: should check if the two & 0x3FFFFFFF are identical.
- // No need to create multiple identical views.
- *view.out_ptr = *views[i - 1].out_ptr;
- }
- else {
- *view.out_ptr = (u8*)arena->CreateView(
- position, view.size, base + (view.virtual_address & 0x3FFFFFFF));
- if (!*view.out_ptr)
- goto bail;
- }
-#endif
-
- last_position = position;
- position += roundup(view.size);
- }
-
- return true;
-
-bail:
- // Argh! ERROR! Free what we grabbed so far so we can try again.
- for (int j = 0; j <= i; j++)
- {
- if (views[i].size == 0)
- continue;
- SKIP(flags, views[i].flags);
- if (views[j].out_ptr_low && *views[j].out_ptr_low)
- {
- arena->ReleaseView(*views[j].out_ptr_low, views[j].size);
- *views[j].out_ptr_low = nullptr;
- }
- if (*views[j].out_ptr)
- {
-#if EMU_ARCH_BITS == 64
- arena->ReleaseView(*views[j].out_ptr, views[j].size);
-#else
- if (!(views[j].flags & MV_MIRROR_PREVIOUS))
- {
- arena->ReleaseView(*views[j].out_ptr, views[j].size);
- }
-#endif
- *views[j].out_ptr = nullptr;
- }
- }
- return false;
-}
-
-u8 *MemoryMap_Setup(const MemoryView *views, int num_views, u32 flags, MemArena *arena)
-{
- size_t total_mem = 0;
- int base_attempts = 0;
-
- for (int i = 0; i < num_views; i++)
- {
- if (views[i].size == 0)
- continue;
- SKIP(flags, views[i].flags);
- if ((views[i].flags & MV_MIRROR_PREVIOUS) == 0)
- total_mem += roundup(views[i].size);
- }
- // Grab some pagefile backed memory out of the void ...
- arena->GrabLowMemSpace(total_mem);
-
- // Now, create views in high memory where there's plenty of space.
-#if EMU_ARCH_BITS == 64
- u8 *base = MemArena::Find4GBBase();
- // This really shouldn't fail - in 64-bit, there will always be enough
- // address space.
- if (!Memory_TryBase(base, views, num_views, flags, arena))
- {
- LOG_ERROR(Common_Memory, "MemoryMap_Setup: Failed finding a memory base.");
- return 0;
- }
-#elif defined(_WIN32)
- // Try a whole range of possible bases. Return once we got a valid one.
- u32 max_base_addr = 0x7FFF0000 - 0x10000000;
- u8 *base = nullptr;
-
- for (u32 base_addr = 0x01000000; base_addr < max_base_addr; base_addr += 0x400000)
- {
- base_attempts++;
- base = (u8 *)base_addr;
- if (Memory_TryBase(base, views, num_views, flags, arena))
- {
- LOG_DEBUG(Common_Memory, "Found valid memory base at %p after %i tries.", base, base_attempts);
- base_attempts = 0;
- break;
- }
- }
-#else
- // Linux32 is fine with the x64 method, although limited to 32-bit with no automirrors.
- u8 *base = MemArena::Find4GBBase();
- if (!Memory_TryBase(base, views, num_views, flags, arena))
- {
- LOG_ERROR(Common_Memory, "MemoryMap_Setup: Failed finding a memory base.");
- return 0;
- }
-#endif
- if (base_attempts)
- LOG_ERROR(Common_Memory, "No possible memory base pointer found!");
- return base;
-}
-
-void MemoryMap_Shutdown(const MemoryView *views, int num_views, u32 flags, MemArena *arena)
-{
- for (int i = 0; i < num_views; i++)
- {
- if (views[i].size == 0)
- continue;
- SKIP(flags, views[i].flags);
- if (views[i].out_ptr_low && *views[i].out_ptr_low)
- arena->ReleaseView(*views[i].out_ptr_low, views[i].size);
- if (*views[i].out_ptr && (views[i].out_ptr_low && *views[i].out_ptr != *views[i].out_ptr_low))
- arena->ReleaseView(*views[i].out_ptr, views[i].size);
- *views[i].out_ptr = nullptr;
- if (views[i].out_ptr_low)
- *views[i].out_ptr_low = nullptr;
- }
-}
diff --git a/src/common/mem_arena.h b/src/common/mem_arena.h
deleted file mode 100644
index d514fe58cf33b2e4e4f18cc34d6c7701eb4ec3f5..0000000000000000000000000000000000000000
--- a/src/common/mem_arena.h
+++ /dev/null
@@ -1,70 +0,0 @@
-// Copyright (C) 2003 Dolphin Project.
-
-// This program is free software: you can redistribute it and/or modify
-// it under the terms of the GNU General Public License as published by
-// the Free Software Foundation, version 2.0 or later versions.
-
-// This program is distributed in the hope that it will be useful,
-// but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-// GNU General Public License 2.0 for more details.
-
-// A copy of the GPL 2.0 should have been included with the program.
-// If not, see http://www.gnu.org/licenses/
-
-// Official SVN repository and contact information can be found at
-// http://code.google.com/p/dolphin-emu/
-
-#pragma once
-
-#ifdef _WIN32
-#include <windows.h>
-#endif
-
-#include "common/common_types.h"
-
-// This class lets you create a block of anonymous RAM, and then arbitrarily map views into it.
-// Multiple views can mirror the same section of the block, which makes it very convient for emulating
-// memory mirrors.
-
-class MemArena
-{
-public:
- void GrabLowMemSpace(size_t size);
- void ReleaseSpace();
- void *CreateView(s64 offset, size_t size, void *base = 0);
- void ReleaseView(void *view, size_t size);
-
- // This only finds 1 GB in 32-bit
- static u8 *Find4GBBase();
-private:
-
-#ifdef _WIN32
- HANDLE hMemoryMapping;
-#else
- int fd;
-#endif
-};
-
-enum {
- MV_MIRROR_PREVIOUS = 1,
- // MV_FAKE_VMEM = 2,
- // MV_WII_ONLY = 4,
- MV_IS_PRIMARY_RAM = 0x100,
- MV_IS_EXTRA1_RAM = 0x200,
- MV_IS_EXTRA2_RAM = 0x400,
-};
-
-struct MemoryView
-{
- u8 **out_ptr_low;
- u8 **out_ptr;
- u32 virtual_address;
- u32 size;
- u32 flags;
-};
-
-// Uses a memory arena to set up an emulator-friendly memory map according to
-// a passed-in list of MemoryView structures.
-u8 *MemoryMap_Setup(const MemoryView *views, int num_views, u32 flags, MemArena *arena);
-void MemoryMap_Shutdown(const MemoryView *views, int num_views, u32 flags, MemArena *arena);
diff --git a/src/core/mem_map.cpp b/src/core/mem_map.cpp
index ae88cfb1179d167e4d337a160f56d718cced2e0d..46e271c808c322ffccb25b7fa486f590b7da68f1 100644
--- a/src/core/mem_map.cpp
+++ b/src/core/mem_map.cpp
@@ -2,10 +2,8 @@
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
-#include "common/common_funcs.h"
#include "common/common_types.h"
#include "common/logging/log.h"
-#include "common/mem_arena.h"
#include "core/mem_map.h"
@@ -13,100 +11,51 @@
namespace Memory {
-u8* g_base; ///< The base pointer to the auto-mirrored arena.
+u8* g_exefs_code; ///< ExeFS:/.code is loaded here
+u8* g_system_mem; ///< System memory
+u8* g_heap; ///< Application heap (main memory)
+u8* g_heap_linear; ///< Linear heap
+u8* g_vram; ///< Video memory (VRAM) pointer
+u8* g_shared_mem; ///< Shared memory
+u8* g_dsp_mem; ///< DSP memory
+u8* g_kernel_mem; ///< Kernel memory
-static MemArena arena; ///< The MemArena class
+namespace {
-u8* g_exefs_code; ///< ExeFS:/.code is loaded here
-u8* g_system_mem; ///< System memory
-u8* g_heap; ///< Application heap (main memory)
-u8* g_heap_linear; ///< Linear heap
-u8* g_vram; ///< Video memory (VRAM) pointer
-u8* g_shared_mem; ///< Shared memory
-u8* g_dsp_mem; ///< DSP memory
-u8* g_kernel_mem; ///< Kernel memory
-
-static u8* physical_bootrom; ///< Bootrom physical memory
-static u8* uncached_bootrom;
-
-static u8* physical_exefs_code; ///< Phsical ExeFS:/.code is loaded here
-static u8* physical_system_mem; ///< System physical memory
-static u8* physical_fcram; ///< Main physical memory (FCRAM)
-static u8* physical_heap_gsp; ///< GSP heap physical memory
-static u8* physical_vram; ///< Video physical memory (VRAM)
-static u8* physical_shared_mem; ///< Physical shared memory
-static u8* physical_dsp_mem; ///< Physical DSP memory
-static u8* physical_kernel_mem; ///< Kernel memory
-
-// We don't declare the IO region in here since its handled by other means.
-static MemoryView g_views[] = {
- {&g_exefs_code, &physical_exefs_code, EXEFS_CODE_VADDR, EXEFS_CODE_SIZE, 0},
- {&g_vram, &physical_vram, VRAM_VADDR, VRAM_SIZE, 0},
- {&g_heap, &physical_fcram, HEAP_VADDR, HEAP_SIZE, MV_IS_PRIMARY_RAM},
- {&g_shared_mem, &physical_shared_mem, SHARED_MEMORY_VADDR, SHARED_MEMORY_SIZE, 0},
- {&g_system_mem, &physical_system_mem, SYSTEM_MEMORY_VADDR, SYSTEM_MEMORY_SIZE, 0},
- {&g_dsp_mem, &physical_dsp_mem, DSP_MEMORY_VADDR, DSP_MEMORY_SIZE, 0},
- {&g_kernel_mem, &physical_kernel_mem, KERNEL_MEMORY_VADDR, KERNEL_MEMORY_SIZE, 0},
- {&g_heap_linear, &physical_heap_gsp, HEAP_LINEAR_VADDR, HEAP_LINEAR_SIZE, 0},
+struct MemoryArea {
+ u8** ptr;
+ size_t size;
};
-/*static MemoryView views[] =
-{
- {&m_pScratchPad, &m_pPhysicalScratchPad, 0x00010000, SCRATCHPAD_SIZE, 0},
- {NULL, &m_pUncachedScratchPad, 0x40010000, SCRATCHPAD_SIZE, MV_MIRROR_PREVIOUS},
- {&m_pVRAM, &m_pPhysicalVRAM, 0x04000000, 0x00800000, 0},
- {NULL, &m_pUncachedVRAM, 0x44000000, 0x00800000, MV_MIRROR_PREVIOUS},
- {&m_pRAM, &m_pPhysicalRAM, 0x08000000, g_MemorySize, MV_IS_PRIMARY_RAM}, // only from 0x08800000 is it usable (last 24 megs)
- {NULL, &m_pUncachedRAM, 0x48000000, g_MemorySize, MV_MIRROR_PREVIOUS | MV_IS_PRIMARY_RAM},
- {NULL, &m_pKernelRAM, 0x88000000, g_MemorySize, MV_MIRROR_PREVIOUS | MV_IS_PRIMARY_RAM},
-
- // TODO: There are a few swizzled mirrors of VRAM, not sure about the best way to
- // implement those.
-};*/
+// We don't declare the IO regions in here since its handled by other means.
+static MemoryArea memory_areas[] = {
+ {&g_exefs_code, EXEFS_CODE_SIZE },
+ {&g_vram, VRAM_SIZE },
+ {&g_heap, HEAP_SIZE },
+ {&g_shared_mem, SHARED_MEMORY_SIZE},
+ {&g_system_mem, SYSTEM_MEMORY_SIZE},
+ {&g_dsp_mem, DSP_MEMORY_SIZE },
+ {&g_kernel_mem, KERNEL_MEMORY_SIZE},
+ {&g_heap_linear, HEAP_LINEAR_SIZE },
+};
-static const int kNumMemViews = sizeof(g_views) / sizeof(MemoryView); ///< Number of mem views
+}
void Init() {
- int flags = 0;
-
- for (size_t i = 0; i < ARRAY_SIZE(g_views); i++) {
- if (g_views[i].flags & MV_IS_PRIMARY_RAM)
- g_views[i].size = FCRAM_SIZE;
+ for (MemoryArea& area : memory_areas) {
+ *area.ptr = new u8[area.size];
}
-
- g_base = MemoryMap_Setup(g_views, kNumMemViews, flags, &arena);
MemBlock_Init();
- LOG_DEBUG(HW_Memory, "initialized OK, RAM at %p (mirror at 0 @ %p)", g_heap,
- physical_fcram);
+ LOG_DEBUG(HW_Memory, "initialized OK, RAM at %p", g_heap);
}
void Shutdown() {
- u32 flags = 0;
- MemoryMap_Shutdown(g_views, kNumMemViews, flags, &arena);
- arena.ReleaseSpace();
MemBlock_Shutdown();
-
- g_base = nullptr;
- g_exefs_code = nullptr;
- g_system_mem = nullptr;
- g_heap = nullptr;
- g_heap_linear = nullptr;
- g_vram = nullptr;
- g_shared_mem = nullptr;
- g_dsp_mem = nullptr;
- g_kernel_mem = nullptr;
-
- physical_bootrom = nullptr;
- uncached_bootrom = nullptr;
- physical_exefs_code = nullptr;
- physical_system_mem = nullptr;
- physical_fcram = nullptr;
- physical_heap_gsp = nullptr;
- physical_vram = nullptr;
- physical_shared_mem = nullptr;
- physical_dsp_mem = nullptr;
- physical_kernel_mem = nullptr;
+ for (MemoryArea& area : memory_areas) {
+ delete[] *area.ptr;
+ *area.ptr = nullptr;
+ }
LOG_DEBUG(HW_Memory, "shutdown OK");
}
diff --git a/src/core/mem_map.h b/src/core/mem_map.h
index b11f2ea686facb660f0f7e15bacba3ab931d89c2..1fb77c94a9ca3f4898ce158649c606d2d3749e84 100644
--- a/src/core/mem_map.h
+++ b/src/core/mem_map.h
@@ -105,18 +105,6 @@ struct MemoryBlock {
////////////////////////////////////////////////////////////////////////////////////////////////////
-// Base is a pointer to the base of the memory map. Yes, some MMU tricks
-// are used to set up a full GC or Wii memory map in process memory. on
-// 32-bit, you have to mask your offsets with 0x3FFFFFFF. This means that
-// some things are mirrored too many times, but eh... it works.
-
-// In 64-bit, this might point to "high memory" (above the 32-bit limit),
-// so be sure to load it into a 64-bit register.
-extern u8 *g_base;
-
-// These are guaranteed to point to "low memory" addresses (sub-32-bit).
-// 64-bit: Pointers to low-mem (sub-0x10000000) mirror
-// 32-bit: Same as the corresponding physical/virtual pointers.
extern u8* g_heap_linear; ///< Linear heap (main memory)
extern u8* g_heap; ///< Application heap (main memory)
extern u8* g_vram; ///< Video memory (VRAM)