1 files changed, 306 insertions, 0 deletions
diff --git a/nuttx/mm/mm_kerneluser.c b/nuttx/mm/mm_kerneluser.c
new file mode 100644
index 000000000..da1f2716e
--- /dev/null
+++ b/nuttx/mm/mm_kerneluser.c
@@ -0,0 +1,306 @@
+/************************************************************************
+ * mm/mm_kerneluser.c
+ *
+ *   Copyright (C) 2011, 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 <nuttx/kmalloc.h>
+
+#if defined(CONFIG_NUTTX_KERNEL) && defined(__KERNEL__)
+
+/* This logic is all tentatively and, hopefully, will grow in usability.
+ * For now, the kernel-mode build uses the memory manager that is
+ * provided in the user-space build.  That is awkward but reasonable for
+ * the current level of support:  At present, only memory protection is
+ * provided.  Kernel-mode code may call into user-mode code, but not
+ * vice-versa.  So hosting the memory manager in user-space allows the
+ * memory manager to be shared in both kernel- and user-mode spaces.
+ *
+ * In the longer run, if an MMU is support that can provide virtualized
+ * memory, then some SLAB memory manager will be required in kernel-space
+ * with some kind of brk() system call to obtain mapped heap space.
+ *
+ * In the current build model, the user-space module is built first. The
+ * file user_map.h is generated in the first pass and contains the
+ * addresses of the memory manager needed in this file:
+ */
+
+#include <arch/board/user_map.h>
+
+/************************************************************************
+ * Pre-processor definition
+ ************************************************************************/
+
+/* These values are obtained from user_map.h */
+
+#define KINITIALIZE(h,s) ((kminitialize_t)CONFIG_USER_MMINIT)(h,s)
+#define KADDREGION(h,s)  ((kmaddregion_t)CONFIG_USER_MMADDREGION)(h,s)
+#define KMALLOC(s)       ((kmalloc_t)CONFIG_USER_MALLOC)(s)
+#define KZALLOC(s)       ((kzalloc_t)CONFIG_USER_ZALLOC)(s)
+#define KREALLOC(p,s)    ((krealloc_t)CONFIG_USER_REALLOC)(p,s)
+#define KFREE(p)         ((kfree_t)CONFIG_USER_FREE)(p)
+#define KTRYSEMAPHORE()  ((kmtrysemaphore_t) CONFIG_USER_MMTRYSEM )()
+#define KGIVESEMAPHORE() ((kmgivesemaphore_t)CONFIG_USER_MMGIVESEM)()
+
+/************************************************************************
+ * Private Types
+ ************************************************************************/
+
+typedef void (*kminitialize_t)(FAR void*, size_t);
+typedef void (*kmaddregion_t)(FAR void*, size_t);
+typedef FAR void *(*kmalloc_t)(size_t);
+typedef FAR void *(*kzalloc_t)(size_t);
+typedef FAR void *(*krealloc_t)(FAR void*, size_t);
+typedef void (*kfree_t)(FAR void *);
+typedef int  (*kmtrysemaphore_t)(void);
+typedef void (*kmgivesemaphore_t)(void);
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Name: kumm_initialize
+ *
+ * Description:
+ *   This is a simple redirection to the user-space mm_initialize()
+ *   function.
+ *
+ * Parameters:
+ *   heap_start - Address of the beginning of the (initial) memory region
+ *   heap_size  - The size (in bytes) if the (initial) memory region.
+ *
+ * Return Value:
+ *   None
+ *
+ * Assumptions:
+ *   1. mm_initialize() resides in user-space
+ *   2. The address of the user space mm_initialize() is provided in
+ *      user_map.h
+ *   3. The user-space mm_initialize() is callable from kernel-space.
+ *
+ ************************************************************************/
+
+void kumm_initialize(FAR void *heap_start, size_t heap_size)
+{
+  return KINITIALIZE(heap_start, heap_size);
+}
+
+/************************************************************************
+ * Name: kumm_addregion
+ *
+ * Description:
+ *   This is a simple redirection to the user-space mm_addregion()
+ *   function.
+ *
+ * Parameters:
+ *   heap_start - Address of the beginning of the memory region
+ *   heap_size  - The size (in bytes) if the memory region.
+ *
+ * Return Value:
+ *   None
+ *
+ * Assumptions:
+ *   1. mm_addregion() resides in user-space
+ *   2. The address of the user space mm_addregion() is provided in
+ *      user_map.h
+ *   3. The user-space mm_addregion() is callable from kernel-space.
+ *
+ ************************************************************************/
+
+void kumm_addregion(FAR void *heap_start, size_t heap_size)
+{
+  return KADDREGION(heap_start, heap_size);
+}
+
+/************************************************************************
+ * Name: kumalloc
+ *
+ * Description:
+ *   This is a simple redirection to the user-space malloc() function.
+ *
+ * Parameters:
+ *   size - Size (in bytes) of the memory region to be allocated.
+ *
+ * Return Value:
+ *   The address of the allocated memory (NULL on failure to allocate)
+ *
+ * Assumptions:
+ *   1. malloc() resides in user-space
+ *   2. The address of the user space malloc() is provided in user_map.h
+ *   3. The user-space malloc() is callable from kernel-space.
+ *
+ ************************************************************************/
+
+FAR void *kumalloc(size_t size)
+{
+  return KMALLOC(size);
+}
+
+/************************************************************************
+ * Name: kuzalloc
+ *
+ * Description:
+ *   This is a simple redirection to the user-space zalloc() function.
+ *
+ * Parameters:
+ *   size - Size (in bytes) of the memory region to be allocated.
+ *
+ * Return Value:
+ *   The address of the allocated memory (NULL on failure to allocate)
+ *
+ * Assumptions:
+ *   1. zalloc() resides in user-space
+ *   2. The address of the user space zalloc() is provided in user_map.h
+ *   3. The user-space zalloc() is callable from kernel-space.
+ *
+ ************************************************************************/
+
+FAR void *kuzalloc(size_t size)
+{
+  return KZALLOC(size);
+}
+
+/************************************************************************
+ * Name: kurealloc
+ *
+ * Description:
+ *   This is a simple redirection to the user-space realloc() function.
+ *
+ * Parameters:
+ *   oldmem  - The old memory allocated
+ *   newsize - Size (in bytes) of the new memory region to be re-allocated.
+ *
+ * Return Value:
+ *   The address of the re-allocated memory (NULL on failure to re-allocate)
+ *
+ * Assumptions:
+ *   1. realloc() resides in user-space
+ *   2. The address of the user space realloc() is provided in user_map.h
+ *   3. The user-space realloc() is callable from kernel-space.
+ *
+ ************************************************************************/
+
+FAR void *kurealloc(FAR void *oldmem, size_t newsize)
+{
+  return KREALLOC(oldmem, newsize);
+}
+
+/************************************************************************
+ * Name: kufree
+ *
+ * Description:
+ *   This is a simple redirection to the user-space free() function.
+ *
+ * Parameters:
+ *   None
+ *
+ * Return Value:
+ *   None
+ *
+ * Assumptions:
+ *   1. free() resides in user-space
+ *   2. The address of the user space free() is provided in user_map.h
+ *   3. The user-space free() is callable from kernel-space.
+ *
+ ************************************************************************/
+
+void kufree(FAR void *mem)
+{
+#ifdef CONFIG_MM_KERNEL_HEAP
+  DEBUGASSERT(!kmm_heapmember(mem));
+#endif
+  return KFREE(mem);
+}
+
+/************************************************************************
+ * Name: kumm_trysemaphore
+ *
+ * Description:
+ *   This is a simple redirection to the user-space mm_trysemaphore()
+ *   function.
+ *
+ * Parameters:
+ *   None
+ *
+ * Return Value:
+ *   OK on success; a negated errno on failure
+ *
+ * Assumptions:
+ *   1. mm_trysemaphore() resides in user-space
+ *   2. The address of the user space mm_trysemaphore() is provided in
+ *      user_map.h
+ *   3. The user-space mm_semaphore() is callable from kernel-space.
+ *
+ ************************************************************************/
+
+int kumm_trysemaphore(void)
+{
+  return KTRYSEMAPHORE();
+}
+
+/************************************************************************
+ * Name: kumm_givesemaphore
+ *
+ * Description:
+ *   This is a simple redirection to the user-space mm_givesemaphore()
+ *   function.
+ *
+ * Parameters:
+ *   None
+ *
+ * Return Value:
+ *   OK on success; a negated errno on failure
+ *
+ * Assumptions:
+ *   1. mm_givesemaphore() resides in user-space
+ *   2. The address of the user space mm_givesemaphore() is provided in
+ *      user_map.h
+ *   3. The user-space mm_semaphore() is callable from kernel-space.
+ *
+ ************************************************************************/
+
+void kumm_givesemaphore(void)
+{
+  KGIVESEMAPHORE();
+}
+
+#endif /* CONFIG_NUTTX_KERNEL && __KERNEL__ */