1 files changed, 477 insertions, 0 deletions

diff --git a/src/common/mem_arena.cpp b/src/common/mem_arena.cpp
new file mode 100644
index 000000000..1a6fcf44d
--- /dev/null
+++ b/src/common/mem_arena.cpp
@@ -0,0 +1,477 @@
+// 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 "memory_util.h"
+#include "mem_arena.h"
+
+#ifdef _WIN32
+//#include "CommonWindows.h"
+#else
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <cerrno>
+#include <cstring>
+#ifdef ANDROID
+#include <sys/ioctl.h>
+#include <linux/ashmem.h>
+#endif
+#endif
+
+#ifdef IOS
+void* globalbase = NULL;
+#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:
+    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
+
+
+void MemArena::GrabLowMemSpace(size_t size)
+{
+#ifdef _WIN32
+#ifndef _XBOX
+    hMemoryMapping = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, (DWORD)(size), NULL);
+    GetSystemInfo(&sysInfo);
+#endif
+#elif defined(ANDROID)
+    // Use ashmem so we don't have to allocate a file on disk!
+    fd = ashmem_create_region("PPSSPP_RAM", size);
+    // Note that it appears that ashmem is pinned by default, so no need to pin.
+    if (fd < 0)
+    {
+        ERROR_LOG(MEMMAP, "Failed to grab ashmem space of size: %08x  errno: %d", (int)size, (int)(errno));
+        return;
+    }
+#else
+    mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
+    fd = open(ram_temp_file.c_str(), O_RDWR | O_CREAT, mode);
+    if (fd < 0)
+    {
+        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;
+    }
+    // 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
+}
+
+
+void MemArena::ReleaseSpace()
+{
+#ifdef _WIN32
+    CloseHandle(hMemoryMapping);
+    hMemoryMapping = 0;
+#elif defined(__SYMBIAN32__)
+    memmap->Close();
+    delete memmap;
+#else
+    close(fd);
+#endif
+}
+
+
+void *MemArena::CreateView(s64 offset, size_t size, void *base)
+{
+#ifdef _WIN32
+#ifdef _XBOX
+    size = roundup(size);
+    // use 64kb pages
+    void * ptr = VirtualAlloc(NULL, size, MEM_COMMIT | MEM_LARGE_PAGES, PAGE_READWRITE);
+    return ptr;
+#else
+    size = roundup(size);
+    void *ptr = MapViewOfFileEx(hMemoryMapping, FILE_MAP_ALL_ACCESS, 0, (DWORD)((u64)offset), size, base);
+    return ptr;
+#endif
+#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)
+    {
+        NOTICE_LOG(MEMMAP, "mmap on %s (fd: %d) failed", ram_temp_file.c_str(), (int)fd);
+        return 0;
+    }
+    return retval;
+#endif
+}
+
+
+void MemArena::ReleaseView(void* view, size_t size)
+{
+#ifdef _WIN32
+#ifndef _XBOX
+    UnmapViewOfFile(view);
+#endif
+#elif defined(__SYMBIAN32__)
+    memmap->Decommit(((int)view - (int)memmap->Base()) & 0x3FFFFFFF, size);
+#else
+    munmap(view, size);
+#endif
+}
+
+#ifndef __SYMBIAN32__
+u8* MemArena::Find4GBBase()
+{
+#ifdef _M_X64
+#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
+#ifdef IOS
+    void* base = NULL;
+    if (globalbase == NULL){
+        base = mmap(0, 0x08000000, PROT_READ | PROT_WRITE,
+            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
+    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
+    return static_cast<u8*>(base);
+#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) {
+    // 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;
+
+#if defined(_XBOX)
+    void *ptr;
+#endif
+
+    // 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:
+    // 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 = 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)
+{
+    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 ...
+#ifndef __SYMBIAN32__
+    arena->GrabLowMemSpace(total_mem);
+#endif
+
+    // Now, create views in high memory where there's plenty of space.
+#ifdef _M_X64
+    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))
+    {
+        PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
+        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
+    // 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))
+    {
+        ERROR_LOG(MEMMAP, "MemoryMap_Setup: Failed finding a memory base.");
+        PanicAlert("MemoryMap_Setup: Failed finding a memory base.");
+        return 0;
+    }
+#endif
+    if (base_attempts)
+        PanicAlert("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 = NULL;
+        if (views[i].out_ptr_low)
+            *views[i].out_ptr_low = NULL;
+    }
+}