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diff --git a/bifrost/r25p0/kernel/include/linux/protected_memory_allocator.h b/bifrost/r25p0/kernel/include/linux/protected_memory_allocator.h
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+++ b/bifrost/r25p0/kernel/include/linux/protected_memory_allocator.h
@@ -0,0 +1,110 @@
+/*
+ *
+ * (C) COPYRIGHT 2019 ARM Limited. All rights reserved.
+ *
+ * This program is free software and is provided to you under the terms of the
+ * GNU General Public License version 2 as published by the Free Software
+ * Foundation, and any use by you of this program is subject to the terms
+ * of such GNU licence.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you can access it online at
+ * http://www.gnu.org/licenses/gpl-2.0.html.
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ *
+ */
+
+#ifndef _PROTECTED_MEMORY_ALLOCATOR_H_
+#define _PROTECTED_MEMORY_ALLOCATOR_H_
+
+#include <linux/mm.h>
+
+/**
+ * struct protected_memory_allocation - Protected memory allocation
+ *
+ * @pa:    Physical address of the protected memory allocation.
+ * @order: Size of memory allocation in pages, as a base-2 logarithm.
+ */
+struct protected_memory_allocation {
+	phys_addr_t pa;
+	unsigned int order;
+};
+
+struct protected_memory_allocator_device;
+
+/**
+ * struct protected_memory_allocator_ops - Callbacks for protected memory
+ *                                         allocator operations
+ *
+ * @pma_alloc_page:    Callback to allocate protected memory
+ * @pma_get_phys_addr: Callback to get the physical address of an allocation
+ * @pma_free_page:     Callback to free protected memory
+ */
+struct protected_memory_allocator_ops {
+	/**
+	 * pma_alloc_page - Allocate protected memory pages
+	 *
+	 * @pma_dev: The protected memory allocator the request is being made
+	 *           through.
+	 * @order:   How many pages to allocate, as a base-2 logarithm.
+	 *
+	 * Return: Pointer to allocated memory, or NULL if allocation failed.
+	 */
+	struct protected_memory_allocation *(*pma_alloc_page)(
+		struct protected_memory_allocator_device *pma_dev,
+		unsigned int order);
+
+	/**
+	 * pma_get_phys_addr - Get the physical address of the protected memory
+	 *                     allocation
+	 *
+	 * @pma_dev: The protected memory allocator the request is being made
+	 *           through.
+	 * @pma:     The protected memory allocation whose physical address
+	 *           shall be retrieved
+	 *
+	 * Return: The physical address of the given allocation.
+	 */
+	phys_addr_t (*pma_get_phys_addr)(
+		struct protected_memory_allocator_device *pma_dev,
+		struct protected_memory_allocation *pma);
+
+	/**
+	 * pma_free_page - Free a page of memory
+	 *
+	 * @pma_dev: The protected memory allocator the request is being made
+	 *           through.
+	 * @pma:     The protected memory allocation to free.
+	 */
+	void (*pma_free_page)(
+		struct protected_memory_allocator_device *pma_dev,
+		struct protected_memory_allocation *pma);
+};
+
+/**
+ * struct protected_memory_allocator_device - Device structure for protected
+ *                                            memory allocator
+ *
+ * @ops:   Callbacks associated with this device
+ * @owner: Pointer to the module owner
+ *
+ * In order for a system integrator to provide custom behaviors for protected
+ * memory operations performed by the kbase module (controller driver),
+ * they shall provide a platform-specific driver module which implements
+ * this interface.
+ *
+ * This structure should be registered with the platform device using
+ * platform_set_drvdata().
+ */
+struct protected_memory_allocator_device {
+	struct protected_memory_allocator_ops ops;
+	struct module *owner;
+};
+
+#endif /* _PROTECTED_MEMORY_ALLOCATOR_H_ */