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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Port of xrick, a Rick Dangerous clone, to Rockbox.
* See http://www.bigorno.net/xrick/
*
* Copyright (C) 2008-2014 Pierluigi Vicinanza
*
* 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; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "xrick/system/system.h"
#include "xrick/debug.h"
#include "plugin.h"
/*
* Local variables
*/
enum
{
ALIGNMENT = sizeof(void*) /* this is more of an educated guess; might want to adjust for your specific architecture */
};
static U8 * stackBuffer;
static U8 * stackTop;
static size_t stackSize;
static size_t stackMaxSize;
static bool isMemoryInitialised = false;
IFDEBUG_MEMORY( static size_t maxUsedMemory = 0; );
/*
* Initialise memory stack
*/
bool sysmem_init(void)
{
if (isMemoryInitialised)
{
return true;
}
if (rb->audio_status())
{
/* Playback must be stopped the entire time the sound buffer is used.*/
rb->audio_stop();
}
stackBuffer = rb->plugin_get_audio_buffer(&stackMaxSize);
stackTop = stackBuffer;
stackSize = 0;
isMemoryInitialised = true;
return true;
}
/*
* Cleanup memory stack
*/
void sysmem_shutdown(void)
{
if (!isMemoryInitialised)
{
return;
}
if (stackTop != stackBuffer || stackSize != 0)
{
sys_error("(memory) improper deallocation detected");
}
IFDEBUG_MEMORY(
sys_printf("xrick/memory: max memory usage was %u bytes\n", maxUsedMemory);
);
isMemoryInitialised = false;
}
/*
* Allocate a memory-aligned block on top of the memory stack
*/
void *sysmem_push(size_t size)
{
uintptr_t alignedPtr;
size_t * allocatedSizePtr;
size_t neededSize = sizeof(size_t) + size + (ALIGNMENT - 1);
if (stackSize + neededSize > stackMaxSize)
{
sys_error("(memory) tried to allocate a block when memory full");
return NULL;
}
alignedPtr = (((uintptr_t)stackTop) + sizeof(size_t) + ALIGNMENT) & ~((uintptr_t)(ALIGNMENT - 1));
allocatedSizePtr = (size_t *)(alignedPtr);
allocatedSizePtr[-1] = neededSize;
stackTop += neededSize;
stackSize += neededSize;
IFDEBUG_MEMORY(
sys_printf("xrick/memory: allocated %u bytes\n", neededSize);
if (stackSize > maxUsedMemory) maxUsedMemory = stackSize;
);
return (void *)alignedPtr;
}
/*
* Release block from the top of the memory stack
*/
void sysmem_pop(void * alignedPtr)
{
size_t allocatedSize;
if (!alignedPtr)
{
return;
}
if (stackSize == 0)
{
sys_error("(memory) tried to release a block when memory empty");
return;
}
allocatedSize = ((size_t *)(alignedPtr))[-1];
stackTop -= allocatedSize;
stackSize -= allocatedSize;
IFDEBUG_MEMORY(
if ((uintptr_t)alignedPtr != ((((uintptr_t)stackTop) + sizeof(size_t) + ALIGNMENT) & ~((uintptr_t)(ALIGNMENT - 1))))
{
sys_error("(memory) tried to release a wrong block");
return;
}
);
IFDEBUG_MEMORY(
sys_printf("xrick/memory: released %u bytes\n", allocatedSize);
);
}
/* eof */
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