141 lines
4.7 KiB
C
141 lines
4.7 KiB
C
/****************************************************************************
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* mm/umm_heap/umm_initialize.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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 <assert.h>
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#include <nuttx/mm/mm.h>
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#include "umm_heap/umm_heap.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: umm_initialize
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*
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* Description:
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* This is a simple wrapper for the mm_initialize() function. This
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* function will initialize the user heap.
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*
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* CONFIG_BUILD_FLAT:
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* There is only kernel mode "blob" containing both kernel and
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* application code. Depending upon the setting of CONFIG_MM_KERNEL_HEAP
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* there may be a single shared heap (used by both the kernel and
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* application logic) or there may be separate (although unprotected)
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* kernel and user heaps.
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*
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* In this configuration, this function is called early in nx_start()
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* to initialize the common heap.
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*
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* CONFIG_BUILD_PROTECTED
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* In this configuration, there are two "blobs", one containing
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* protected kernel logic and one containing unprotected application
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* logic. Depending upon the setting of CONFIG_MM_KERNEL_HEAP there
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* may be only a single shared heap, much as with CONFIG_BUILD_FLAT.
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* Or there may be separate protected/kernel and unprotected/user
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* heaps.
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*
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* In either case, this function is still called early in nx_start()
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* to initialize the user heap.
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*
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* CONFIG_BUILD_KERNEL
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* In this configuration there are multiple user heaps, one for each
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* user process. Furthermore, each heap is initially empty; memory
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* is added to each heap dynamically via sbrk(). The heap data
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* structure was set to zero when the address environment was created.
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* Otherwise, the heap is uninitialized.
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*
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* This function is not called at all. Rather, this function is called
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* when each user process is created before the first allocation is made.
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*
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* Input Parameters:
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* heap_start - Address of the beginning of the (initial) memory region
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* heap_size - The size (in bytes) if the (initial) memory region.
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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void umm_initialize(FAR void *heap_start, size_t heap_size)
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{
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#ifdef CONFIG_BUILD_KERNEL
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USR_HEAP = mm_initialize_pool(NULL, heap_start, heap_size, NULL);
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#else
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USR_HEAP = mm_initialize_pool("Umem", heap_start, heap_size, NULL);
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#endif
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}
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/****************************************************************************
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* Name: umm_try_initialize
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*
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* Description:
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* Allocate and initialize the user heap if not yet.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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****************************************************************************/
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#ifdef CONFIG_BUILD_KERNEL
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void umm_try_initialize(void)
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{
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uintptr_t allocbase;
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size_t npages = 1;
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/* Return if the user heap is already initialized. */
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if (USR_HEAP != NULL)
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{
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return;
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}
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#ifdef CONFIG_MM_KASAN
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/* we have to commit all memory for the shadow region */
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npages = CONFIG_ARCH_HEAP_NPAGES;
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#endif
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/* If we provide a zero brkaddr to pgalloc(),
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* it will create the first block in the correct virtual address
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* space and return the start address of that block.
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*/
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allocbase = pgalloc(0, npages);
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DEBUGASSERT(allocbase != 0);
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/* Let umm_initialize do the real work. */
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umm_initialize((FAR void *)allocbase, npages * CONFIG_MM_PGSIZE);
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}
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#endif
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