diff --git a/include/private/ui/sw_gralloc_handle.h b/include/private/ui/sw_gralloc_handle.h
new file mode 100644
index 0000000..b3d333e
--- /dev/null
+++ b/include/private/ui/sw_gralloc_handle.h
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_UI_PRIVATE_SW_GRALLOC_HANDLE_H
+#define ANDROID_UI_PRIVATE_SW_GRALLOC_HANDLE_H
+
+#include <stdint.h>
+#include <limits.h>
+#include <sys/cdefs.h>
+#include <hardware/gralloc.h>
+#include <errno.h>
+
+#include <cutils/native_handle.h>
+
+namespace android {
+
+/*****************************************************************************/
+
+struct sw_gralloc_handle_t : public native_handle 
+{
+    // file-descriptors
+    int     fd;
+    // ints
+    int     magic;
+    int     size;
+    int     base;
+    int     prot;
+    int     pid;
+
+    static const int sNumInts = 5;
+    static const int sNumFds = 1;
+    static const int sMagic = '_sgh';
+
+    sw_gralloc_handle_t() :
+        fd(-1), magic(sMagic), size(0), base(0), prot(0), pid(getpid())
+    {
+        version = sizeof(native_handle);
+        numInts = sNumInts;
+        numFds = sNumFds;
+    }
+    ~sw_gralloc_handle_t() {
+        magic = 0;
+    }
+
+    static int validate(const native_handle* h) {
+        const sw_gralloc_handle_t* hnd = (const sw_gralloc_handle_t*)h;
+        if (!h || h->version != sizeof(native_handle) ||
+                h->numInts != sNumInts || h->numFds != sNumFds ||
+                hnd->magic != sMagic) 
+        {
+            return -EINVAL;
+        }
+        return 0;
+    }
+
+    static status_t alloc(uint32_t w, uint32_t h, int format,
+            int usage, buffer_handle_t* handle, int32_t* stride);
+    static status_t free(sw_gralloc_handle_t* hnd);
+    static status_t registerBuffer(sw_gralloc_handle_t* hnd);
+    static status_t unregisterBuffer(sw_gralloc_handle_t* hnd);
+    static status_t lock(sw_gralloc_handle_t* hnd, int usage,
+            int l, int t, int w, int h, void** vaddr);
+    static status_t unlock(sw_gralloc_handle_t* hnd);
+};
+
+/*****************************************************************************/
+
+}; // namespace android
+
+#endif /* ANDROID_UI_PRIVATE_SW_GRALLOC_HANDLE_H */
diff --git a/libs/ui/GraphicBufferAllocator.cpp b/libs/ui/GraphicBufferAllocator.cpp
index 10b1051..57d5fc3 100644
--- a/libs/ui/GraphicBufferAllocator.cpp
+++ b/libs/ui/GraphicBufferAllocator.cpp
@@ -22,6 +22,7 @@
 
 #include <ui/GraphicBufferAllocator.h>
 
+#include <private/ui/sw_gralloc_handle.h>
 
 namespace android {
 // ---------------------------------------------------------------------------
@@ -29,7 +30,8 @@
 ANDROID_SINGLETON_STATIC_INSTANCE( GraphicBufferAllocator )
 
 Mutex GraphicBufferAllocator::sLock;
-KeyedVector<buffer_handle_t, GraphicBufferAllocator::alloc_rec_t> GraphicBufferAllocator::sAllocList;
+KeyedVector<buffer_handle_t,
+    GraphicBufferAllocator::alloc_rec_t> GraphicBufferAllocator::sAllocList;
 
 GraphicBufferAllocator::GraphicBufferAllocator()
     : mAllocDev(0)
@@ -83,8 +85,13 @@
     h = clamp(h);
 
     // we have a h/w allocator and h/w buffer is requested
-    status_t err = mAllocDev->alloc(mAllocDev,
-            w, h, format, usage, handle, stride);
+    status_t err; 
+    
+    if (usage & GRALLOC_USAGE_HW_MASK) {
+        err = mAllocDev->alloc(mAllocDev, w, h, format, usage, handle, stride);
+    } else {
+        err = sw_gralloc_handle_t::alloc(w, h, format, usage, handle, stride);
+    }
 
     LOGW_IF(err, "alloc(%u, %u, %d, %08x, ...) failed %d (%s)",
             w, h, format, usage, err, strerror(-err));
@@ -113,9 +120,14 @@
 {
     Mutex::Autolock _l(mLock);
 
-    status_t err = mAllocDev->free(mAllocDev, handle);
+    status_t err;
+    if (sw_gralloc_handle_t::validate(handle) < 0) {
+        err = mAllocDev->free(mAllocDev, handle);
+    } else {
+        err = sw_gralloc_handle_t::free((sw_gralloc_handle_t*)handle);
+    }
+
     LOGW_IF(err, "free(...) failed %d (%s)", err, strerror(-err));
-    
     if (err == NO_ERROR) {
         Mutex::Autolock _l(sLock);
         KeyedVector<buffer_handle_t, alloc_rec_t>& list(sAllocList);
diff --git a/libs/ui/GraphicBufferMapper.cpp b/libs/ui/GraphicBufferMapper.cpp
index dd529e6..ce2acd0 100644
--- a/libs/ui/GraphicBufferMapper.cpp
+++ b/libs/ui/GraphicBufferMapper.cpp
@@ -17,7 +17,15 @@
 #define LOG_TAG "GraphicBufferMapper"
 
 #include <stdint.h>
+#ifdef HAVE_ANDROID_OS      // just want PAGE_SIZE define
+# include <asm/page.h>
+#else
+# include <sys/user.h>
+#endif
 #include <errno.h>
+#include <sys/mman.h>
+
+#include <cutils/ashmem.h>
 
 #include <utils/Errors.h>
 #include <utils/Log.h>
@@ -27,6 +35,8 @@
 
 #include <hardware/gralloc.h>
 
+#include <private/ui/sw_gralloc_handle.h>
+
 
 namespace android {
 // ---------------------------------------------------------------------------
@@ -46,7 +56,12 @@
 
 status_t GraphicBufferMapper::registerBuffer(buffer_handle_t handle)
 {
-    status_t err = mAllocMod->registerBuffer(mAllocMod, handle);
+    status_t err;
+    if (sw_gralloc_handle_t::validate(handle) < 0) {
+        err = mAllocMod->registerBuffer(mAllocMod, handle);
+    } else {
+        err = sw_gralloc_handle_t::registerBuffer((sw_gralloc_handle_t*)handle);
+    }
     LOGW_IF(err, "registerBuffer(%p) failed %d (%s)",
             handle, err, strerror(-err));
     return err;
@@ -54,7 +69,12 @@
 
 status_t GraphicBufferMapper::unregisterBuffer(buffer_handle_t handle)
 {
-    status_t err = mAllocMod->unregisterBuffer(mAllocMod, handle);
+    status_t err;
+    if (sw_gralloc_handle_t::validate(handle) < 0) {
+        err = mAllocMod->unregisterBuffer(mAllocMod, handle);
+    } else {
+        err = sw_gralloc_handle_t::unregisterBuffer((sw_gralloc_handle_t*)handle);
+    }
     LOGW_IF(err, "unregisterBuffer(%p) failed %d (%s)",
             handle, err, strerror(-err));
     return err;
@@ -63,18 +83,146 @@
 status_t GraphicBufferMapper::lock(buffer_handle_t handle, 
         int usage, const Rect& bounds, void** vaddr)
 {
-    status_t err = mAllocMod->lock(mAllocMod, handle, usage,
-            bounds.left, bounds.top, bounds.width(), bounds.height(), vaddr);
+    status_t err;
+    if (sw_gralloc_handle_t::validate(handle) < 0) {
+        err = mAllocMod->lock(mAllocMod, handle, usage,
+                bounds.left, bounds.top, bounds.width(), bounds.height(),
+                vaddr);
+    } else {
+        err = sw_gralloc_handle_t::lock((sw_gralloc_handle_t*)handle, usage,
+                bounds.left, bounds.top, bounds.width(), bounds.height(),
+                vaddr);
+    }
     LOGW_IF(err, "lock(...) failed %d (%s)", err, strerror(-err));
     return err;
 }
 
 status_t GraphicBufferMapper::unlock(buffer_handle_t handle)
 {
-    status_t err = mAllocMod->unlock(mAllocMod, handle);
+    status_t err;
+    if (sw_gralloc_handle_t::validate(handle) < 0) {
+        err = mAllocMod->unlock(mAllocMod, handle);
+    } else {
+        err = sw_gralloc_handle_t::unlock((sw_gralloc_handle_t*)handle);
+    }
     LOGW_IF(err, "unlock(...) failed %d (%s)", err, strerror(-err));
     return err;
 }
 
 // ---------------------------------------------------------------------------
+
+status_t sw_gralloc_handle_t::alloc(uint32_t w, uint32_t h, int format,
+        int usage, buffer_handle_t* pHandle, int32_t* pStride)
+{
+    int align = 4;
+    int bpp = 0;
+    switch (format) {
+        case HAL_PIXEL_FORMAT_RGBA_8888:
+        case HAL_PIXEL_FORMAT_RGBX_8888:
+        case HAL_PIXEL_FORMAT_BGRA_8888:
+            bpp = 4;
+            break;
+        case HAL_PIXEL_FORMAT_RGB_888:
+            bpp = 3;
+            break;
+        case HAL_PIXEL_FORMAT_RGB_565:
+        case HAL_PIXEL_FORMAT_RGBA_5551:
+        case HAL_PIXEL_FORMAT_RGBA_4444:
+            bpp = 2;
+            break;
+        default:
+            return -EINVAL;
+    }
+    size_t bpr = (w*bpp + (align-1)) & ~(align-1);
+    size_t size = bpr * h;
+    size_t stride = bpr / bpp;
+    size = (size + (PAGE_SIZE-1)) & ~(PAGE_SIZE-1);
+    
+    int fd = ashmem_create_region("sw-gralloc-buffer", size);
+    if (fd < 0) {
+        LOGE("ashmem_create_region(size=%d) failed (%s)",
+                size, strerror(-errno));
+        return -errno;
+    }
+    
+    int prot = PROT_READ;
+    if (usage & GRALLOC_USAGE_SW_WRITE_MASK)
+        prot |= PROT_WRITE;
+    
+    if (ashmem_set_prot_region(fd, prot) < 0) {
+        LOGE("ashmem_set_prot_region(fd=%d, prot=%x) failed (%s)",
+                fd, prot, strerror(-errno));
+        close(fd);
+        return -errno;
+    }
+
+    void* base = mmap(0, size, prot, MAP_SHARED, fd, 0);
+    if (base == MAP_FAILED) {
+        LOGE("alloc mmap(fd=%d, size=%d, prot=%x) failed (%s)",
+                fd, size, prot, strerror(-errno));
+        close(fd);
+        return -errno;
+    }
+
+    sw_gralloc_handle_t* hnd = new sw_gralloc_handle_t();
+    hnd->fd = fd;
+    hnd->size = size;
+    hnd->base = intptr_t(base);
+    hnd->prot = prot;
+    *pStride = stride;
+    *pHandle = hnd; 
+    
+    return NO_ERROR;
+}
+
+status_t sw_gralloc_handle_t::free(sw_gralloc_handle_t* hnd)
+{
+    if (hnd->base) {
+        munmap((void*)hnd->base, hnd->size);
+    }
+    if (hnd->fd >= 0) {
+        close(hnd->fd);
+    }
+    delete hnd;    
+    return NO_ERROR;
+}
+
+status_t sw_gralloc_handle_t::registerBuffer(sw_gralloc_handle_t* hnd)
+{
+    if (hnd->pid != getpid()) {
+        void* base = mmap(0, hnd->size, hnd->prot, MAP_SHARED, hnd->fd, 0);
+        if (base == MAP_FAILED) {
+            LOGE("registerBuffer mmap(fd=%d, size=%d, prot=%x) failed (%s)",
+                    hnd->fd, hnd->size, hnd->prot, strerror(-errno));
+            return -errno;
+        }
+        hnd->base = intptr_t(base);
+    }
+    return NO_ERROR;
+}
+
+status_t sw_gralloc_handle_t::unregisterBuffer(sw_gralloc_handle_t* hnd)
+{
+    if (hnd->pid != getpid()) {
+        if (hnd->base) {
+            munmap((void*)hnd->base, hnd->size);
+        }
+        hnd->base = 0;
+    }
+    return NO_ERROR;
+}
+
+status_t sw_gralloc_handle_t::lock(sw_gralloc_handle_t* hnd, int usage,
+        int l, int t, int w, int h, void** vaddr)
+{
+    *vaddr = (void*)hnd->base;
+    return NO_ERROR;
+}
+
+status_t sw_gralloc_handle_t::unlock(sw_gralloc_handle_t* hnd)
+{
+    return NO_ERROR;
+}
+
+// ---------------------------------------------------------------------------
 }; // namespace android