|
|
/****************************************************************************
* arch/arm/src/tiva/tiva_allocateheap.c
*
* Copyright (C) 2013 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE
* COPYRIGHT OWNER 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdint.h>
#include <assert.h>
#include <debug.h>
#include <nuttx/arch.h>
#include <nuttx/userspace.h>
#include <arch/board/board.h>
#include "mpu.h"
#include "up_arch.h"
#include "up_internal.h"
#include "tiva_mpuinit.h"
/****************************************************************************
* Private Definitions
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: up_allocate_heap
*
* Description:
* This function will be called to dynamically set aside the heap region.
*
* For the kernel build (CONFIG_BUILD_PROTECTED=y) with both kernel- and
* user-space heaps (CONFIG_MM_KERNEL_HEAP=y), this function provides the
* size of the unprotected, user-space heap.
*
* If a protected kernel-space heap is provided, the kernel heap must be
* allocated (and protected) by an analogous up_allocate_kheap().
*
* The following memory map is assumed for the flat build:
*
* .data region. Size determined at link time.
* .bss region Size determined at link time.
* IDLE thread stack. Size determined by CONFIG_IDLETHREAD_STACKSIZE.
* Heap. Extends to the end of SRAM.
*
* The following memory map is assumed for the kernel build:
*
* Kernel .data region. Size determined at link time.
* Kernel .bss region Size determined at link time.
* Kernel IDLE thread stack. Size determined by CONFIG_IDLETHREAD_STACKSIZE.
* Padding for alignment
* User .data region. Size determined at link time.
* User .bss region Size determined at link time.
* Kernel heap. Size determined by CONFIG_MM_KERNEL_HEAPSIZE.
* User heap. Extends to the end of SRAM.
*
****************************************************************************/
void up_allocate_heap(FAR void **heap_start, size_t *heap_size)
{
#if defined(CONFIG_BUILD_PROTECTED) && defined(CONFIG_MM_KERNEL_HEAP)
/* Get the unaligned size and position of the user-space heap.
* This heap begins after the user-space .bss section at an offset
* of CONFIG_MM_KERNEL_HEAPSIZE (subject to alignment).
*/
uintptr_t ubase = (uintptr_t)USERSPACE->us_bssend + CONFIG_MM_KERNEL_HEAPSIZE;
size_t usize = CONFIG_RAM_END - ubase;
int log2;
DEBUGASSERT(ubase < (uintptr_t)CONFIG_RAM_END);
/* Adjust that size to account for MPU alignment requirements.
* NOTE that there is an implicit assumption that the CONFIG_RAM_END
* is aligned to the MPU requirement.
*/
log2 = (int)mpu_log2regionfloor(usize);
DEBUGASSERT((CONFIG_RAM_END & ((1 << log2) - 1)) == 0);
usize = (1 << log2);
ubase = CONFIG_RAM_END - usize;
/* Return the user-space heap settings */
board_led_on(LED_HEAPALLOCATE);
*heap_start = (FAR void*)ubase;
*heap_size = usize;
/* Allow user-mode access to the user heap memory */
tiva_mpu_uheap((uintptr_t)ubase, usize);
#else
/* Return the heap settings */
board_led_on(LED_HEAPALLOCATE);
*heap_start = (FAR void*)g_idle_topstack;
*heap_size = CONFIG_RAM_END - g_idle_topstack;
#endif
}
/****************************************************************************
* Name: up_allocate_kheap
*
* Description:
* For the kernel build (CONFIG_BUILD_PROTECTED=y) with both kernel- and
* user-space heaps (CONFIG_MM_KERNEL_HEAP=y), this function allocates
* (and protects) the kernel-space heap.
*
****************************************************************************/
#if defined(CONFIG_BUILD_PROTECTED) && defined(CONFIG_MM_KERNEL_HEAP)
void up_allocate_kheap(FAR void **heap_start, size_t *heap_size)
{
/* Get the unaligned size and position of the user-space heap.
* This heap begins after the user-space .bss section at an offset
* of CONFIG_MM_KERNEL_HEAPSIZE (subject to alignment).
*/
uintptr_t ubase = (uintptr_t)USERSPACE->us_bssend + CONFIG_MM_KERNEL_HEAPSIZE;
size_t usize = CONFIG_RAM_END - ubase;
int log2;
DEBUGASSERT(ubase < (uintptr_t)CONFIG_RAM_END);
/* Adjust that size to account for MPU alignment requirements.
* NOTE that there is an implicit assumption that the CONFIG_RAM_END
* is aligned to the MPU requirement.
*/
log2 = (int)mpu_log2regionfloor(usize);
DEBUGASSERT((CONFIG_RAM_END & ((1 << log2) - 1)) == 0);
usize = (1 << log2);
ubase = CONFIG_RAM_END - usize;
/* Return the kernel heap settings (i.e., the part of the heap region
* that was not dedicated to the user heap).
*/
*heap_start = (FAR void*)USERSPACE->us_bssend;
*heap_size = ubase - (uintptr_t)USERSPACE->us_bssend;
}
#endif
|
