1 files changed, 282 insertions, 0 deletions
diff --git a/nuttx/mm/mm_kernel.c b/nuttx/mm/mm_kernel.c
new file mode 100644
index 000000000..207d3e28f
--- /dev/null
+++ b/nuttx/mm/mm_kernel.c
@@ -0,0 +1,282 @@
+/************************************************************************
+ * mm/mm_kernel.c
+ *
+ *   Copyright (C) 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(CONFIG_MM_KERNEL_HEAP) && defined(__KERNEL__)
+
+/************************************************************************
+ * Pre-processor definition
+ ************************************************************************/
+
+/************************************************************************
+ * Private Types
+ ************************************************************************/
+
+/************************************************************************
+ * Public Data
+ ************************************************************************/
+
+/* This is the kernel heap */
+
+struct mm_heap_s g_kmmheap;
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Name: kmm_initialize
+ *
+ * Description:
+ *   Initialize the kernel heap data structures, providing the initial
+ *   heap region.
+ *
+ * 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
+ *
+ ************************************************************************/
+
+void kmm_initialize(FAR void *heap_start, size_t heap_size)
+{
+  return mm_initialize(&g_kmmheap, heap_start, heap_size);
+}
+
+/************************************************************************
+ * Name: kmm_addregion
+ *
+ * Description:
+ *   This function adds a region of contiguous memory to the kernel heap.
+ *
+ * Parameters:
+ *   heap_start - Address of the beginning of the memory region
+ *   heap_size  - The size (in bytes) if the memory region.
+ *
+ * Return Value:
+ *   None
+ *
+ ************************************************************************/
+
+void kmm_addregion(FAR void *heap_start, size_t heap_size)
+{
+  return mm_addregion(&g_kmmheap, heap_start, heap_size);
+}
+
+/************************************************************************
+ * Name: kmalloc
+ *
+ * Description:
+ *   Allocate memory from the kernel heap.
+ *
+ * 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)
+ *
+ ************************************************************************/
+
+FAR void *kmalloc(size_t size)
+{
+  return mm_malloc(&g_kmmheap, size);
+}
+
+/************************************************************************
+ * Name: kzalloc
+ *
+ * Description:
+ *   Allocate and zero memory from the kernel heap.
+ *
+ * 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)
+ *
+ ************************************************************************/
+
+FAR void *kzalloc(size_t size)
+{
+  return mm_zalloc(&g_kmmheap, size);
+}
+
+/************************************************************************
+ * Name: krealloc
+ *
+ * Description:
+ *   Re-allocate memory in the kernel heap.
+ *
+ * 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)
+ *
+ ************************************************************************/
+
+FAR void *krealloc(FAR void *oldmem, size_t newsize)
+{
+  return mm_realloc(&g_kmmheap, oldmem, newsize);
+}
+
+/************************************************************************
+ * Name: kfree
+ *
+ * Description:
+ *   Return allocated memory to the kernel heap.
+ *
+ * Parameters:
+ *   None
+ *
+ * Return Value:
+ *   None
+ *
+ ************************************************************************/
+
+void kfree(FAR void *mem)
+{
+  DEBUGASSERT(kmm_heapmember(mem));
+  return mm_free(&g_kmmheap, mem);
+}
+
+/************************************************************************
+ * Name: kmm_trysemaphore
+ *
+ * Description:
+ *   Try to take the kernel heap semaphore.
+ *
+ * Parameters:
+ *   None
+ *
+ * Return Value:
+ *   OK on success; a negated errno on failure
+ *
+ ************************************************************************/
+
+int kmm_trysemaphore(void)
+{
+  return mm_trysemaphore(&g_kmmheap);
+}
+
+/************************************************************************
+ * Name: kmm_givesemaphore
+ *
+ * Description:
+ *   Give the kernel heap semaphore.
+ *
+ * Parameters:
+ *   None
+ *
+ * Return Value:
+ *   OK on success; a negated errno on failure
+ *
+ ************************************************************************/
+
+void kmm_givesemaphore(void)
+{
+  return mm_givesemaphore(&g_kmmheap);
+}
+
+/************************************************************************
+ * Name: kmm_heapmember
+ *
+ * Description:
+ *   Check if an address lies in the kernel heap.
+ *
+ * Parameters:
+ *   mem - The address to check
+ *
+ * Return Value:
+ *   true if the address is a member of the kernel heap.  false if not
+ *   not.  If the address is not a member of the kernel heap, then it
+ *   must be a member of the user-space heap (unchecked)
+ *
+ ************************************************************************/
+
+bool kmm_heapmember(FAR void *mem)
+{
+#if CONFIG_MM_REGIONS > 1
+  int i;
+
+  /* A valid address from the kernel heap for this region would have to lie
+   * between the region's two guard nodes.
+   */
+
+  for (i = 0; i < g_kmmheap.mm_nregions; i++)
+    {
+      if (mem > (FAR void *)g_kmmheap.mm_heapstart[i] &&
+          mem < (FAR void *)g_kmmheap.mm_heapend[i])
+        {
+          return true;
+        }
+    }
+
+  /* The address does not like any any region assigned to kernel heap */
+
+  return false;
+
+#else
+  /* A valid address from the kernel heap would have to lie between the
+   * two guard nodes.
+   */
+
+  if (mem > (FAR void *)g_kmmheap.mm_heapstart[0] &&
+      mem < (FAR void *)g_kmmheap.mm_heapend[0])
+    {
+      return true;
+    }
+
+  /* Otherwise, the address does not lie in the kernel heap */
+
+  return false;
+
+#endif
+}
+
+#endif /* CONFIG_NUTTX_KERNEL && CONFIG_MM_KERNEL_HEAP && __KERNEL__ */