308 lines
8.7 KiB
C
308 lines
8.7 KiB
C
/************************************************************************
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* mm/mm_kernel.c
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*
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* Copyright (C) 2013 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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/kmalloc.h>
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#if defined(CONFIG_NUTTX_KERNEL) && defined(CONFIG_MM_KERNEL_HEAP) && defined(__KERNEL__)
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/************************************************************************
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* Pre-processor definition
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************************************************************************/
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/************************************************************************
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* Private Types
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************************************************************************/
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/************************************************************************
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* Public Data
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************************************************************************/
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/* This is the kernel heap */
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struct mm_heap_s g_kmmheap;
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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: kmm_initialize
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*
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* Description:
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* Initialize the kernel heap data structures, providing the initial
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* heap region.
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*
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* 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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* Return Value:
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* None
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*
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************************************************************************/
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void kmm_initialize(FAR void *heap_start, size_t heap_size)
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{
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return mm_initialize(&g_kmmheap, heap_start, heap_size);
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}
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/************************************************************************
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* Name: kmm_addregion
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*
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* Description:
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* This function adds a region of contiguous memory to the kernel heap.
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*
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* Parameters:
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* heap_start - Address of the beginning of the memory region
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* heap_size - The size (in bytes) if the memory region.
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*
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* Return Value:
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* None
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*
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************************************************************************/
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void kmm_addregion(FAR void *heap_start, size_t heap_size)
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{
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return mm_addregion(&g_kmmheap, heap_start, heap_size);
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}
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/************************************************************************
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* Name: kmalloc
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*
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* Description:
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* Allocate memory from the kernel heap.
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*
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* Parameters:
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* size - Size (in bytes) of the memory region to be allocated.
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*
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* Return Value:
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* The address of the allocated memory (NULL on failure to allocate)
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*
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************************************************************************/
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FAR void *kmalloc(size_t size)
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{
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return mm_malloc(&g_kmmheap, size);
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}
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/************************************************************************
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* Name: kzalloc
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*
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* Description:
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* Allocate and zero memory from the kernel heap.
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*
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* Parameters:
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* size - Size (in bytes) of the memory region to be allocated.
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*
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* Return Value:
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* The address of the allocated memory (NULL on failure to allocate)
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*
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************************************************************************/
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FAR void *kzalloc(size_t size)
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{
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return mm_zalloc(&g_kmmheap, size);
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}
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/************************************************************************
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* Name: krealloc
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*
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* Description:
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* Re-allocate memory in the kernel heap.
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*
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* Parameters:
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* oldmem - The old memory allocated
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* newsize - Size (in bytes) of the new memory region to be re-allocated.
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*
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* Return Value:
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* The address of the re-allocated memory (NULL on failure to re-allocate)
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*
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************************************************************************/
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FAR void *krealloc(FAR void *oldmem, size_t newsize)
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{
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return mm_realloc(&g_kmmheap, oldmem, newsize);
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}
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/************************************************************************
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* Name: kmemalign
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*
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* Description:
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* Allocate aligned memory in the kernel heap.
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*
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* Parameters:
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* alignment - Log2 byte alignment
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* size - Size (in bytes) of the new memory region to be allocated.
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*
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* Return Value:
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* The address of the re-allocated memory (NULL on failure to allocate)
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*
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************************************************************************/
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FAR void *kmemalign(size_t alignment, size_t size)
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{
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return mm_memalign(&g_kmmheap, alignment, size);
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}
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/************************************************************************
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* Name: kfree
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*
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* Description:
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* Return allocated memory to the kernel heap.
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*
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* Parameters:
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* None
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*
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* Return Value:
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* None
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*
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************************************************************************/
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void kfree(FAR void *mem)
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{
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DEBUGASSERT(kmm_heapmember(mem));
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return mm_free(&g_kmmheap, mem);
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}
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/************************************************************************
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* Name: kmm_trysemaphore
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*
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* Description:
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* Try to take the kernel heap semaphore.
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*
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* Parameters:
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* None
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*
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* Return Value:
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* OK on success; a negated errno on failure
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*
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************************************************************************/
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int kmm_trysemaphore(void)
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{
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return mm_trysemaphore(&g_kmmheap);
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}
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/************************************************************************
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* Name: kmm_givesemaphore
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*
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* Description:
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* Give the kernel heap semaphore.
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*
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* Parameters:
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* None
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*
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* Return Value:
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* OK on success; a negated errno on failure
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*
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************************************************************************/
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void kmm_givesemaphore(void)
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{
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return mm_givesemaphore(&g_kmmheap);
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}
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/************************************************************************
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* Name: kmm_heapmember
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*
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* Description:
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* Check if an address lies in the kernel heap.
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*
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* Parameters:
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* mem - The address to check
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*
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* Return Value:
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* true if the address is a member of the kernel heap. false if not
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* not. If the address is not a member of the kernel heap, then it
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* must be a member of the user-space heap (unchecked)
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*
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************************************************************************/
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#ifdef CONFIG_DEBUG
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bool kmm_heapmember(FAR void *mem)
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{
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#if CONFIG_MM_REGIONS > 1
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int i;
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/* A valid address from the kernel heap for this region would have to lie
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* between the region's two guard nodes.
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*/
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for (i = 0; i < g_kmmheap.mm_nregions; i++)
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{
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if (mem > (FAR void *)g_kmmheap.mm_heapstart[i] &&
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mem < (FAR void *)g_kmmheap.mm_heapend[i])
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{
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return true;
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}
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}
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/* The address does not like any any region assigned to kernel heap */
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return false;
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#else
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/* A valid address from the kernel heap would have to lie between the
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* two guard nodes.
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*/
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if (mem > (FAR void *)g_kmmheap.mm_heapstart[0] &&
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mem < (FAR void *)g_kmmheap.mm_heapend[0])
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{
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return true;
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}
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/* Otherwise, the address does not lie in the kernel heap */
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return false;
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#endif
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}
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#endif
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#endif /* CONFIG_NUTTX_KERNEL && CONFIG_MM_KERNEL_HEAP && __KERNEL__ */
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