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grabbed ppsspp's MemArena

This commit is contained in:
bunnei 2014-03-31 21:04:50 -04:00
parent 4fdeadb8e2
commit 07ea22de5c
2 changed files with 423 additions and 216 deletions
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579
src/common/src/mem_arena.cpp
View File

@ -1,14 +1,27 @@
// Copyright 2013 Dolphin Emulator Project // Copyright (C) 2003 Dolphin Project.
// Licensed under GPLv2
// Refer to the license.txt file included.
// 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.h"
#include "memory_util.h" #include "memory_util.h"
#include "mem_arena.h" #include "mem_arena.h"
#ifdef _WIN32 #ifdef _WIN32
#include <windows.h> //#include "CommonWindows.h"
#else #else
#include <sys/stat.h> #include <sys/stat.h>
#include <fcntl.h> #include <fcntl.h>
@ -20,55 +33,134 @@
#include <linux/ashmem.h> #include <linux/ashmem.h>
#endif #endif
#endif #endif
#include <set>
#if defined(__APPLE__) #ifdef IOS
static const char* ram_temp_file = "/tmp/gc_mem.tmp"; void* globalbase = NULL;
#elif !defined(_WIN32) // non OSX unixes
static const char* ram_temp_file = "/dev/shm/gc_mem.tmp";
#endif #endif
#ifdef ANDROID #ifdef ANDROID
#define ASHMEM_DEVICE "/dev/ashmem"
int AshmemCreateFileMapping(const char *name, size_t size) // 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; int fd, ret;
fd = open(ASHMEM_DEVICE, O_RDWR);
if (fd < 0)
return fd;
// We don't really care if we can't set the name, it is optional fd = open(ASHMEM_DEVICE, O_RDWR);
ret = ioctl(fd, ASHMEM_SET_NAME, name); if (fd < 0)
return fd;
ret = ioctl(fd, ASHMEM_SET_SIZE, size); if (name) {
if (ret < 0) char buf[ASHMEM_NAME_LEN];
{
close(fd); strncpy(buf, name, sizeof(buf));
NOTICE_LOG(MEMMAP, "Ashmem returned error: 0x%08x", ret); ret = ioctl(fd, ASHMEM_SET_NAME, buf);
return ret; if (ret < 0)
} goto error;
return fd; }
ret = ioctl(fd, ASHMEM_SET_SIZE, size);
if (ret < 0)
goto error;
return fd;
error:
ERROR_LOG(MEMMAP, "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
#ifndef _WIN32
// do not make this "static"
#if defined(MAEMO) || defined(MEEGO_EDITION_HARMATTAN)
std::string ram_temp_file = "/home/user/gc_mem.tmp";
#else
std::string ram_temp_file = "/tmp/gc_mem.tmp";
#endif
#elif !defined(_XBOX)
SYSTEM_INFO sysInfo;
#endif
// Windows mappings need to be on 64K boundaries, due to Alpha legacy.
#ifdef _WIN32
size_t roundup(size_t x) {
#ifndef _XBOX
int gran = sysInfo.dwAllocationGranularity ? sysInfo.dwAllocationGranularity : 0x10000;
#else
int gran = 0x10000; // 64k in 360
#endif
return (x + gran - 1) & ~(gran - 1);
}
#else
size_t roundup(size_t x) {
return x;
} }
#endif #endif
void MemArena::GrabLowMemSpace(size_t size) void MemArena::GrabLowMemSpace(size_t size)
{ {
#ifdef _WIN32 #ifdef _WIN32
hMemoryMapping = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, (DWORD)(size), NULL); #ifndef _XBOX
hMemoryMapping = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, (DWORD)(size), NULL);
GetSystemInfo(&sysInfo);
#endif
#elif defined(ANDROID) #elif defined(ANDROID)
fd = AshmemCreateFileMapping("Dolphin-emu", size); // Use ashmem so we don't have to allocate a file on disk!
if (fd < 0) fd = ashmem_create_region("PPSSPP_RAM", size);
{ // Note that it appears that ashmem is pinned by default, so no need to pin.
NOTICE_LOG(MEMMAP, "Ashmem allocation failed"); if (fd < 0)
return; {
} ERROR_LOG(MEMMAP, "Failed to grab ashmem space of size: %08x errno: %d", (int)size, (int)(errno));
return;
}
#else #else
mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH; mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
fd = open(ram_temp_file, O_RDWR | O_CREAT, mode); fd = open(ram_temp_file.c_str(), O_RDWR | O_CREAT, mode);
unlink(ram_temp_file); if (fd < 0)
if (ftruncate(fd, size) < 0) {
ERROR_LOG(MEMMAP, "Failed to allocate low memory space"); ERROR_LOG(MEMMAP, "Failed to grab memory space as a file: %s of size: %08x errno: %d", ram_temp_file.c_str(), (int)size, (int)(errno));
return; return;
}
// delete immediately, we keep the fd so it still lives
unlink(ram_temp_file.c_str());
if (ftruncate(fd, size) != 0)
{
ERROR_LOG(MEMMAP, "Failed to ftruncate %d to size %08x", (int)fd, (int)size);
}
return;
#endif #endif
} }
@ -76,10 +168,13 @@ void MemArena::GrabLowMemSpace(size_t size)
void MemArena::ReleaseSpace() void MemArena::ReleaseSpace()
{ {
#ifdef _WIN32 #ifdef _WIN32
CloseHandle(hMemoryMapping); CloseHandle(hMemoryMapping);
hMemoryMapping = 0; hMemoryMapping = 0;
#elif defined(__SYMBIAN32__)
memmap->Close();
delete memmap;
#else #else
close(fd); close(fd);
#endif #endif
} }
@ -87,23 +182,32 @@ void MemArena::ReleaseSpace()
void *MemArena::CreateView(s64 offset, size_t size, void *base) void *MemArena::CreateView(s64 offset, size_t size, void *base)
{ {
#ifdef _WIN32 #ifdef _WIN32
return MapViewOfFileEx(hMemoryMapping, FILE_MAP_ALL_ACCESS, 0, (DWORD)((u64)offset), size, base); #ifdef _XBOX
size = roundup(size);
// use 64kb pages
void * ptr = VirtualAlloc(NULL, size, MEM_COMMIT | MEM_LARGE_PAGES, PAGE_READWRITE);
return ptr;
#else #else
void *retval = mmap( size = roundup(size);
base, size, void *ptr = MapViewOfFileEx(hMemoryMapping, FILE_MAP_ALL_ACCESS, 0, (DWORD)((u64)offset), size, base);
PROT_READ | PROT_WRITE, return ptr;
MAP_SHARED | ((base == nullptr) ? 0 : MAP_FIXED), #endif
fd, offset); #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 BLACKBERRY
MAP_NOSYNCFILE |
#elif defined(__FreeBSD__)
MAP_NOSYNC |
#endif
((base == 0) ? 0 : MAP_FIXED), fd, offset);
if (retval == MAP_FAILED) if (retval == MAP_FAILED)
{ {
NOTICE_LOG(MEMMAP, "mmap on %s failed", ram_temp_file); NOTICE_LOG(MEMMAP, "mmap on %s (fd: %d) failed", ram_temp_file.c_str(), (int)fd);
return nullptr; return 0;
} }
else return retval;
{
return retval;
}
#endif #endif
} }
@ -111,184 +215,263 @@ void *MemArena::CreateView(s64 offset, size_t size, void *base)
void MemArena::ReleaseView(void* view, size_t size) void MemArena::ReleaseView(void* view, size_t size)
{ {
#ifdef _WIN32 #ifdef _WIN32
UnmapViewOfFile(view); #ifndef _XBOX
UnmapViewOfFile(view);
#endif
#elif defined(__SYMBIAN32__)
memmap->Decommit(((int)view - (int)memmap->Base()) & 0x3FFFFFFF, size);
#else #else
munmap(view, size); munmap(view, size);
#endif #endif
} }
#ifndef __SYMBIAN32__
u8* MemArena::Find4GBBase() u8* MemArena::Find4GBBase()
{ {
#ifdef _M_X64 #ifdef _M_X64
#ifdef _WIN32 #ifdef _WIN32
// 64 bit // 64 bit
u8* base = (u8*)VirtualAlloc(0, 0xE1000000, MEM_RESERVE, PAGE_READWRITE); u8* base = (u8*)VirtualAlloc(0, 0xE1000000, MEM_RESERVE, PAGE_READWRITE);
VirtualFree(base, 0, MEM_RELEASE); VirtualFree(base, 0, MEM_RELEASE);
return base; return base;
#else #else
// Very precarious - mmap cannot return an error when trying to map already used pages. // 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... // This makes the Windows approach above unusable on Linux, so we will simply pray...
return reinterpret_cast<u8*>(0x2300000000ULL); return reinterpret_cast<u8*>(0x2300000000ULL);
#endif #endif
#else #else // 32 bit
// 32 bit
#ifdef _WIN32 #ifdef _WIN32
// The highest thing in any 1GB section of memory space is the locked cache. We only need to fit it. u8* base = (u8*)VirtualAlloc(0, 0x10000000, MEM_RESERVE, PAGE_READWRITE);
u8* base = (u8*)VirtualAlloc(0, 0x31000000, MEM_RESERVE, PAGE_READWRITE); if (base) {
if (base) { VirtualFree(base, 0, MEM_RELEASE);
VirtualFree(base, 0, MEM_RELEASE); }
} return base;
return base;
#else #else
#ifdef ANDROID #ifdef IOS
// Android 4.3 changed how mmap works. void* base = NULL;
// if we map it private and then munmap it, we can't use the base returned. if (globalbase == NULL){
// This may be due to changes in them support a full SELinux implementation. base = mmap(0, 0x08000000, PROT_READ | PROT_WRITE,
const int flags = MAP_ANON; MAP_ANON | MAP_SHARED, -1, 0);
if (base == MAP_FAILED) {
PanicAlert("Failed to map 128 MB of memory space: %s", strerror(errno));
return 0;
}
munmap(base, 0x08000000);
globalbase = base;
}
else{ base = globalbase; }
#else #else
const int flags = MAP_ANON | MAP_PRIVATE; void* base = mmap(0, 0x10000000, PROT_READ | PROT_WRITE,
MAP_ANON | MAP_SHARED, -1, 0);
if (base == MAP_FAILED) {
PanicAlert("Failed to map 256 MB of memory space: %s", strerror(errno));
return 0;
}
munmap(base, 0x10000000);
#endif #endif
const u32 MemSize = 0x31000000; return static_cast<u8*>(base);
void* base = mmap(0, MemSize, PROT_NONE, flags, -1, 0);
if (base == MAP_FAILED) {
PanicAlert("Failed to map 1 GB of memory space: %s", strerror(errno));
return 0;
}
munmap(base, MemSize);
return static_cast<u8*>(base);
#endif #endif
#endif #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) { 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! // OK, we know where to find free space. Now grab it!
// We just mimic the popular BAT setup. // We just mimic the popular BAT setup.
u32 position = 0; size_t position = 0;
u32 last_position = 0; size_t last_position = 0;
// Zero all the pointers to be sure. #if defined(_XBOX)
for (int i = 0; i < num_views; i++) void *ptr;
{
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++)
{
if (views[i].flags & MV_MIRROR_PREVIOUS) {
position = last_position;
} else {
*(views[i].out_ptr_low) = (u8*)arena->CreateView(position, views[i].size);
if (!*views[i].out_ptr_low)
goto bail;
}
#ifdef _M_X64
*views[i].out_ptr = (u8*)arena->CreateView(
position, views[i].size, base + views[i].virtual_address);
#else
if (views[i].flags & MV_MIRROR_PREVIOUS) {
// No need to create multiple identical views.
*views[i].out_ptr = *views[i - 1].out_ptr;
} else {
*views[i].out_ptr = (u8*)arena->CreateView(
position, views[i].size, base + (views[i].virtual_address & 0x3FFFFFFF));
if (!*views[i].out_ptr)
goto bail;
}
#endif #endif
last_position = position;
position += views[i].size;
}
return true; // 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 {
#ifdef __SYMBIAN32__
*(view.out_ptr_low) = (u8*)((int)arena->memmap->Base() + view.virtual_address);
arena->memmap->Commit(view.virtual_address & 0x3FFFFFFF, view.size);
}
*(view.out_ptr) = (u8*)((int)arena->memmap->Base() + view.virtual_address & 0x3FFFFFFF);
#elif defined(_XBOX)
*(view.out_ptr_low) = (u8*)(base + view.virtual_address);
//arena->memmap->Commit(view.virtual_address & 0x3FFFFFFF, view.size);
ptr = VirtualAlloc(base + (view.virtual_address & 0x3FFFFFFF), view.size, MEM_COMMIT, PAGE_READWRITE);
}
*(view.out_ptr) = (u8*)base + (view.virtual_address & 0x3FFFFFFF);
#else
*(view.out_ptr_low) = (u8*)arena->CreateView(position, view.size);
if (!*view.out_ptr_low)
goto bail;
}
#ifdef _M_X64
*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
#endif
last_position = position;
position += roundup(view.size);
}
return true;
bail: bail:
// Argh! ERROR! Free what we grabbed so far so we can try again. // Argh! ERROR! Free what we grabbed so far so we can try again.
MemoryMap_Shutdown(views, i+1, flags, arena); for (int j = 0; j <= i; j++)
return false; {
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 = NULL;
}
if (*views[j].out_ptr)
{
#ifdef _M_X64
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 = NULL;
}
}
return false;
} }
u8 *MemoryMap_Setup(const MemoryView *views, int num_views, u32 flags, MemArena *arena) u8 *MemoryMap_Setup(const MemoryView *views, int num_views, u32 flags, MemArena *arena)
{ {
u32 total_mem = 0; size_t total_mem = 0;
int base_attempts = 0; int base_attempts = 0;
for (int i = 0; i < num_views; i++) for (int i = 0; i < num_views; i++)
{ {
if ((views[i].flags & MV_MIRROR_PREVIOUS) == 0) if (views[i].size == 0)
total_mem += views[i].size; continue;
} SKIP(flags, views[i].flags);
// Grab some pagefile backed memory out of the void ... if ((views[i].flags & MV_MIRROR_PREVIOUS) == 0)
arena->GrabLowMemSpace(total_mem); total_mem += roundup(views[i].size);
}
// Grab some pagefile backed memory out of the void ...
#ifndef __SYMBIAN32__
arena->GrabLowMemSpace(total_mem);
#endif
// Now, create views in high memory where there's plenty of space. // Now, create views in high memory where there's plenty of space.
#ifdef _M_X64 #ifdef _M_X64
u8 *base = MemArena::Find4GBBase(); u8 *base = MemArena::Find4GBBase();
// This really shouldn't fail - in 64-bit, there will always be enough // This really shouldn't fail - in 64-bit, there will always be enough
// address space. // address space.
if (!Memory_TryBase(base, views, num_views, flags, arena)) if (!Memory_TryBase(base, views, num_views, flags, arena))
{ {
PanicAlert("MemoryMap_Setup: Failed finding a memory base."); PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
exit(0); return 0;
return 0; }
} #elif defined(_XBOX)
// Reserve 256MB
u8 *base = (u8*)VirtualAlloc(0, 0x10000000, MEM_RESERVE | MEM_LARGE_PAGES, PAGE_READWRITE);
if (!Memory_TryBase(base, views, num_views, flags, arena))
{
PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
exit(0);
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 = NULL;
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))
{
INFO_LOG(MEMMAP, "Found valid memory base at %p after %i tries.", base, base_attempts);
base_attempts = 0;
break;
}
}
#elif defined(__SYMBIAN32__)
arena->memmap = new RChunk();
arena->memmap->CreateDisconnectedLocal(0, 0, 0x10000000);
if (!Memory_TryBase(arena->memmap->Base(), views, num_views, flags, arena))
{
PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
return 0;
}
u8* base = arena->memmap->Base();
#else #else
#ifdef _WIN32 // Linux32 is fine with the x64 method, although limited to 32-bit with no automirrors.
// Try a whole range of possible bases. Return once we got a valid one. u8 *base = MemArena::Find4GBBase();
u32 max_base_addr = 0x7FFF0000 - 0x31000000; if (!Memory_TryBase(base, views, num_views, flags, arena))
u8 *base = NULL; {
ERROR_LOG(MEMMAP, "MemoryMap_Setup: Failed finding a memory base.");
for (u32 base_addr = 0x40000; base_addr < max_base_addr; base_addr += 0x40000) PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
{ return 0;
base_attempts++; }
base = (u8 *)base_addr;
if (Memory_TryBase(base, views, num_views, flags, arena))
{
INFO_LOG(MEMMAP, "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))
{
PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
exit(0);
return 0;
}
#endif #endif
if (base_attempts)
#endif PanicAlert("No possible memory base pointer found!");
if (base_attempts) return base;
PanicAlert("No possible memory base pointer found!");
return base;
} }
void MemoryMap_Shutdown(const MemoryView *views, int num_views, u32 flags, MemArena *arena) void MemoryMap_Shutdown(const MemoryView *views, int num_views, u32 flags, MemArena *arena)
{ {
std::set<void*> freeset; for (int i = 0; i < num_views; i++)
for (int i = 0; i < num_views; i++) {
{ if (views[i].size == 0)
const MemoryView* view = &views[i]; continue;
u8** outptrs[2] = {view->out_ptr_low, view->out_ptr}; SKIP(flags, views[i].flags);
for (int j = 0; j < 2; j++) if (views[i].out_ptr_low && *views[i].out_ptr_low)
{ arena->ReleaseView(*views[i].out_ptr_low, views[i].size);
u8** outptr = outptrs[j]; if (*views[i].out_ptr && (views[i].out_ptr_low && *views[i].out_ptr != *views[i].out_ptr_low))
if (outptr && *outptr && !freeset.count(*outptr)) arena->ReleaseView(*views[i].out_ptr, views[i].size);
{ *views[i].out_ptr = NULL;
arena->ReleaseView(*outptr, view->size); if (views[i].out_ptr_low)
freeset.insert(*outptr); *views[i].out_ptr_low = NULL;
*outptr = NULL; }
}
}
}
} }

62
src/common/src/mem_arena.h
View File

@ -1,7 +1,19 @@
// Copyright 2013 Dolphin Emulator Project // Copyright (C) 2003 Dolphin Project.
// Licensed under GPLv2
// Refer to the license.txt file included.
// 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/
#ifndef _MEMARENA_H_ #ifndef _MEMARENA_H_
#define _MEMARENA_H_ #define _MEMARENA_H_
@ -10,43 +22,55 @@
#include <windows.h> #include <windows.h>
#endif #endif
#ifdef __SYMBIAN32__
#include <e32std.h>
#endif
#include "common.h" #include "common.h"
// This class lets you create a block of anonymous RAM, and then arbitrarily map views into it. // 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 convenient for emulating // Multiple views can mirror the same section of the block, which makes it very convient for emulating
// memory mirrors. // memory mirrors.
class MemArena class MemArena
{ {
public: public:
void GrabLowMemSpace(size_t size); void GrabLowMemSpace(size_t size);
void ReleaseSpace(); void ReleaseSpace();
void *CreateView(s64 offset, size_t size, void *base = nullptr); void *CreateView(s64 offset, size_t size, void *base = 0);
void ReleaseView(void *view, size_t size); void ReleaseView(void *view, size_t size);
// This only finds 1 GB in 32-bit #ifdef __SYMBIAN32__
static u8 *Find4GBBase(); RChunk* memmap;
#else
// This only finds 1 GB in 32-bit
static u8 *Find4GBBase();
#endif
private: private:
#ifdef _WIN32 #ifdef _WIN32
HANDLE hMemoryMapping; HANDLE hMemoryMapping;
#else #else
int fd; int fd;
#endif #endif
}; };
enum { enum {
MV_MIRROR_PREVIOUS = 1, MV_MIRROR_PREVIOUS = 1,
MV_IS_PRIMARY_RAM = 0x100, // 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 struct MemoryView
{ {
u8 **out_ptr_low; u8 **out_ptr_low;
u8 **out_ptr; u8 **out_ptr;
u32 virtual_address; u32 virtual_address;
u32 size; u32 size;
u32 flags; u32 flags;
}; };
// Uses a memory arena to set up an emulator-friendly memory map according to // Uses a memory arena to set up an emulator-friendly memory map according to