/* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*-
 * PIOS interface shims for MSHEAP
 *
 * Copyright 2011 Michael Smith. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *    1. Redistributions of source code must retain the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer.
 *
 *    2. Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials
 *       provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER ''AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "msheap.h"
#include "pios_config.h"
#include "pios.h"

/*
 * Symbols exported by the linker script telling us where the heap is.
 */
extern char	_sheap;
extern char	_eheap;

#ifdef PIOS_TARGET_PROVIDES_FAST_HEAP
extern char _sfastheap;
extern char _efastheap;
#define IS_FAST_HEAP_POINTER(x) (((void *)&_sfastheap < (void *)(x)) && ((void *)&_efastheap > (void *)(x)))
#else
#define IS_FAST_HEAP_POINTER(x) (false)
#endif


#if defined(PIOS_INCLUDE_FREERTOS)
/*
 * Defining MPU_WRAPPERS_INCLUDED_FROM_API_FILE prevents task.h from redefining
 * all the API functions to use the MPU wrappers.  That should only be done when
 * task.h is included from an application file.
 * */
#define MPU_WRAPPERS_INCLUDED_FROM_API_FILE
# include "FreeRTOS.h"
# include "task.h"
#undef MPU_WRAPPERS_INCLUDED_FROM_API_FILE

heap_handle_t sram_heap;
#if PIOS_TARGET_PROVIDES_FAST_HEAP
heap_handle_t fast_heap;
#else
#define fast_heap sram_heap
#endif

/*
 * Optional callback for allocation failures.
 */
extern void vApplicationMallocFailedHook(void) __attribute__((weak));

void *
pios_general_malloc(size_t s, bool use_fast_heap)
{
	void *p;

	vPortEnterCritical();
	if(use_fast_heap){
		p = msheap_alloc(&fast_heap, s);
	} else {
		p = msheap_alloc(&sram_heap, s);
	}
	vPortExitCritical();

	if (p == NULL && &vApplicationMallocFailedHook != NULL) {
		vApplicationMallocFailedHook();
	}
	return p;
}

void *
pvPortMalloc(size_t s)
{
	return pios_general_malloc(s, true);
}

void *
pvPortMallocStack(size_t s)
{
	return pios_general_malloc(s, false);
}

void
vPortFree(void *p)
{
	vPortEnterCritical();
	if(IS_FAST_HEAP_POINTER(p)){
		msheap_free(&fast_heap, p);
	} else {
		msheap_free(&sram_heap, p);
	}
	vPortExitCritical();
}

size_t
xPortGetFreeHeapSize(void)
{

#ifdef PIOS_TARGET_PROVIDES_FAST_HEAP
    return msheap_free_space(&sram_heap) + msheap_free_space(&fast_heap);
#else
    return msheap_free_space(&sram_heap);
#endif
}

void
vPortInitialiseBlocks(void)
{
	msheap_init(&sram_heap, &_sheap, &_eheap);
#if PIOS_TARGET_PROVIDES_FAST_HEAP
	msheap_init(&fast_heap, &_sfastheap, &_efastheap);
#endif
}

void
xPortIncreaseHeapSize(size_t bytes)
{
	msheap_extend(&sram_heap, bytes);
}

#else /* !PIOS_INCLUDE_FREERTOS */
int heap_init_done;
void *
malloc(size_t size)
{
//	static 

	if (!heap_init_done) {
		msheap_init(sram_heap, &_sheap, &_eheap);
		heap_init_done = 1;
	}

	return msheap_alloc(sram_heap, size);
}

void
free(void *p)
{
	return msheap_free(sram_heap, p);
}

#endif /* PIOS_INCLUDE_FREERTOS */

void
msheap_panic(__attribute__((unused)) const char *reason)
{
	//PIOS_DEBUG_Panic(reason);
}