181 lines
6.3 KiB
C
181 lines
6.3 KiB
C
/****************************************************************************
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* arch/arm/src/kinetis/kinetis_allocateheap.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <assert.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/board.h>
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#include <nuttx/userspace.h>
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#include "mpu.h"
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#include "arm_internal.h"
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#include "kinetis_mpuinit.h"
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#include <arch/board/board.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_allocate_heap
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*
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* Description:
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* This function will be called to dynamically set aside the heap region.
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*
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* For the kernel build (CONFIG_BUILD_PROTECTED=y) with both kernel- and
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* user-space heaps (CONFIG_MM_KERNEL_HEAP=y), this function provides the
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* size of the unprotected, user-space heap.
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*
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* If a protected kernel-space heap is provided, the kernel heap must be
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* allocated (and protected) by an analogous up_allocate_kheap().
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*
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* The following memory map is assumed for the flat build:
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*
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* .data region. Size determined at link time.
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* .bss region Size determined at link time.
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* IDLE thread stack. Size determined by CONFIG_IDLETHREAD_STACKSIZE.
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* Heap. Extends to the end of SRAM.
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*
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* The following memory map is assumed for the kernel build:
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*
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* Kernel .data region. Size determined at link time.
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* Kernel .bss region Size determined at link time.
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* Kernel IDLE thread stack. Size determined by
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* CONFIG_IDLETHREAD_STACKSIZE).
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* Padding for alignment
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* User .data region. Size determined at link time.
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* User .bss region Size determined at link time.
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* Kernel heap. Size determined by CONFIG_MM_KERNEL_HEAPSIZE.
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* User heap. Extends to the end of SRAM.
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*
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****************************************************************************/
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void up_allocate_heap(void **heap_start, size_t *heap_size)
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{
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#if defined(CONFIG_BUILD_PROTECTED) && defined(CONFIG_MM_KERNEL_HEAP)
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/* Get the unaligned size and position of the user-space heap.
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* This heap begins after the user-space .bss section at an offset
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* of CONFIG_MM_KERNEL_HEAPSIZE (subject to alignment).
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*/
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uintptr_t ubase = (uintptr_t)USERSPACE->us_bssend +
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CONFIG_MM_KERNEL_HEAPSIZE;
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size_t usize = CONFIG_RAM_END - ubase;
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int log2;
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DEBUGASSERT(ubase < (uintptr_t)CONFIG_RAM_END);
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/* Adjust that size to account for MPU alignment requirements.
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* NOTE that there is an implicit assumption that the CONFIG_RAM_END
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* is aligned to the MPU requirement.
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*/
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log2 = (int)mpu_log2regionfloor(usize);
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DEBUGASSERT((CONFIG_RAM_END & ((1 << log2) - 1)) == 0);
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usize = (1 << log2);
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ubase = CONFIG_RAM_END - usize;
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/* Return the user-space heap settings */
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board_autoled_on(LED_HEAPALLOCATE);
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*heap_start = (void *)ubase;
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*heap_size = usize;
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/* Allow user-mode access to the user heap memory */
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kinetis_mpu_uheap((uintptr_t)ubase, usize);
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#else
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/* Return the heap settings */
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board_autoled_on(LED_HEAPALLOCATE);
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*heap_start = (void *)g_idle_topstack;
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*heap_size = CONFIG_RAM_END - g_idle_topstack;
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#endif
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}
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/****************************************************************************
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* Name: up_allocate_kheap
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*
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* Description:
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* For the kernel build (CONFIG_BUILD_PROTECTED=y) with both kernel- and
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* user-space heaps (CONFIG_MM_KERNEL_HEAP=y), this function allocates
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* (and protects) the kernel-space heap.
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*
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****************************************************************************/
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#if defined(CONFIG_BUILD_PROTECTED) && defined(CONFIG_MM_KERNEL_HEAP)
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void up_allocate_kheap(void **heap_start, size_t *heap_size)
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{
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/* Get the unaligned size and position of the user-space heap.
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* This heap begins after the user-space .bss section at an offset
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* of CONFIG_MM_KERNEL_HEAPSIZE (subject to alignment).
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*/
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uintptr_t ubase = (uintptr_t)USERSPACE->us_bssend +
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CONFIG_MM_KERNEL_HEAPSIZE;
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size_t usize = CONFIG_RAM_END - ubase;
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int log2;
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DEBUGASSERT(ubase < (uintptr_t)CONFIG_RAM_END);
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/* Adjust that size to account for MPU alignment requirements.
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* NOTE that there is an implicit assumption that the CONFIG_RAM_END
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* is aligned to the MPU requirement.
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*/
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log2 = (int)mpu_log2regionfloor(usize);
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DEBUGASSERT((CONFIG_RAM_END & ((1 << log2) - 1)) == 0);
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usize = (1 << log2);
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ubase = CONFIG_RAM_END - usize;
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/* Return the kernel heap settings (i.e., the part of the heap region
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* that was not dedicated to the user heap).
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*/
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*heap_start = (void *)USERSPACE->us_bssend;
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*heap_size = ubase - (uintptr_t)USERSPACE->us_bssend;
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}
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#endif
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