208 lines
7.7 KiB
C
208 lines
7.7 KiB
C
/****************************************************************************
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* include/nuttx/kmalloc.h
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*
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* Copyright (C) 2007-2008, 2011, 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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#ifndef __INCLUDE_NUTTX_KMALLOC_H
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#define __INCLUDE_NUTTX_KMALLOC_H
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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 <stdbool.h>
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#include <stdlib.h>
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#include <nuttx/mm/mm.h>
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#include <nuttx/userspace.h>
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#if !defined(CONFIG_BUILD_PROTECTED) || defined(__KERNEL__)
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/****************************************************************************
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* Public Types
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#undef KMALLOC_EXTERN
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#if defined(__cplusplus)
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# define KMALLOC_EXTERN extern "C"
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extern "C"
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{
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#else
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# define KMALLOC_EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/* For a monolithic, kernel-mode NuttX build. Special allocators must be
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* used. Otherwise, the standard allocators prototyped in stdlib.h may
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* be used for both the kernel- and user-mode objects.
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*/
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/* This family of allocators is used to manage user-accessible memory
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* from the kernel. In the flat build, the following are declared in
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* stdlib.h and are directly callable. In the kernel-phase of the kernel
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* build, the following are defined in userspace.h as macros that call
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* into user-space via a header at the beginning of the user-space blob.
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*/
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#define kumm_initialize(h,s) umm_initialize(h,s)
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#define kumm_addregion(h,s) umm_addregion(h,s)
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#define kumm_trysemaphore() umm_trysemaphore()
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#define kumm_givesemaphore() umm_givesemaphore()
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#define kumm_malloc(s) malloc(s)
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#define kumm_zalloc(s) zalloc(s)
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#define kumm_realloc(p,s) realloc(p,s)
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#define kumm_memalign(a,s) memalign(a,s)
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#define kumm_free(p) free(p)
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/* This family of allocators is used to manage kernel protected memory */
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#if !defined(CONFIG_BUILD_PROTECTED) && !defined(CONFIG_MM_KERNEL_HEAP)
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/* If this is not a kernel build, then these map to the same interfaces
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* as were used for the user-mode function.
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*/
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# define kmm_initialize(h,s) /* Initialization done by kumm_initialize */
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# define kmm_addregion(h,s) umm_addregion(h,s)
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# define kmm_trysemaphore() umm_trysemaphore()
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# define kmm_givesemaphore() umm_givesemaphore()
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# define kmm_malloc(s) malloc(s)
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# define kmm_zalloc(s) zalloc(s)
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# define kmm_realloc(p,s) realloc(p,s)
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# define kmm_memalign(a,s) memalign(a,s)
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# define kmm_free(p) free(p)
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#elif !defined(CONFIG_MM_KERNEL_HEAP)
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/* If this the kernel phase of a kernel build, and there are only user-space
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* allocators, then the following are defined in userspace.h as macros that
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* call into user-space via a header at the beginning of the user-space blob.
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*/
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# define kmm_initialize(h,s) /* Initialization done by kumm_initialize */
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# define kmm_addregion(h,s) umm_addregion(h,s)
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# define kmm_trysemaphore() umm_trysemaphore()
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# define kmm_givesemaphore() umm_givesemaphore()
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# define kmm_malloc(s) umm_malloc(s)
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# define kmm_zalloc(s) umm_zalloc(s)
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# define kmm_realloc(p,s) umm_realloc(p,s)
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# define kmm_memalign(a,s) umm_memalign(a,s)
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# define kmm_free(p) umm_free(p)
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#else
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/* Otherwise, the kernel-space allocators are declared in include/nuttx/mm/mm.h
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* and we can call them directly.
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*/
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#endif
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#if (defined(CONFIG_BUILD_PROTECTED) || defined(CONFIG_BUILD_KERNEL)) && \
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defined(CONFIG_MM_KERNEL_HEAP)
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/****************************************************************************
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* Group memory management
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*
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* Manage memory allocations appropriately for the group type. If the
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* memory is part of a privileged group, then it should be allocated so
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* that it is only accessible by privileged code; Otherwise, it is a
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* user mode group and must be allocated so that it accessible by
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* unprivileged code.
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*
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****************************************************************************/
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/* Functions defined in group/group_malloc.c ********************************/
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FAR void *group_malloc(FAR struct task_group_s *group, size_t nbytes);
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/* Functions defined in group/group_zalloc.c ********************************/
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FAR void *group_zalloc(FAR struct task_group_s *group, size_t nbytes);
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/* Functions defined in group/group_free.c **********************************/
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void group_free(FAR struct task_group_s *group, FAR void *mem);
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#else
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/* In the flat build, there is only one memory allocator and no distinction
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* in privileges.
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*/
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# define group_malloc(g,n) kumm_malloc(n)
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# define group_zalloc(g,n) kumm_zalloc(n)
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# define group_free(g,m) kumm_free(m)
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#endif
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/* Functions defined in sched/sched_kfree.c **********************************/
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/* Handles memory freed from an interrupt handler. In that context, kmm_free()
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* (or kumm_free()) cannot be called. Instead, the allocations are saved in a
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* list of delayed allocations that will be periodically cleaned up by
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* sched_garbagecollection().
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*/
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void sched_ufree(FAR void *address);
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#if defined(CONFIG_MM_KERNEL_HEAP) && defined(__KERNEL__)
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void sched_kfree(FAR void *address);
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#else
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# define sched_kfree(a) sched_ufree(a)
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#endif
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/* Functions defined in sched/sched_garbage *********************************/
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/* Must be called periodically to clean up deallocations delayed by
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* sched_kmm_free(). This may be done from either the IDLE thread or from a
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* worker thread. The IDLE thread has very low priority and could starve
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* the system for memory in some context.
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*/
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void sched_garbagecollection(void);
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#undef KMALLOC_EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* !CONFIG_BUILD_PROTECTED || __KERNEL__ */
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#endif /* __INCLUDE_NUTTX_KMALLOC_H */
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