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/*-
 *   BSD LICENSE
 * 
 *   Copyright(c) 2010-2013 Intel Corporation. All rights reserved.
 *   All rights reserved.
 * 
 *   Redistribution and use in source and binary forms, with or without
 *   modification, are permitted provided that the following conditions
 *   are met:
 * 
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Intel Corporation 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.
 */

#ifndef _RTE_MEMORY_H_
#define _RTE_MEMORY_H_

/**
 * @file
 *
 * Memory-related RTE API.
 */

#include <stdint.h>
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

enum rte_page_sizes {
	RTE_PGSIZE_4K = 1 << 12,
	RTE_PGSIZE_2M = RTE_PGSIZE_4K << 9,
	RTE_PGSIZE_1G = RTE_PGSIZE_2M <<9
};

#define SOCKET_ID_ANY -1                    /**< Any NUMA socket. */
#define CACHE_LINE_SIZE 64                  /**< Cache line size. */
#define CACHE_LINE_MASK (CACHE_LINE_SIZE-1) /**< Cache line mask. */

#define CACHE_LINE_ROUNDUP(size) \
	(CACHE_LINE_SIZE * ((size + CACHE_LINE_SIZE - 1) / CACHE_LINE_SIZE))
/**< Return the first cache-aligned value greater or equal to size. */

/**
 * Force alignment to cache line.
 */
#define __rte_cache_aligned __attribute__((__aligned__(CACHE_LINE_SIZE)))

typedef uint64_t phys_addr_t; /**< Physical address definition. */

/**
 * Physical memory segment descriptor.
 */
struct rte_memseg {
	phys_addr_t phys_addr;      /**< Start physical address. */
	union {
		void *addr;         /**< Start virtual address. */
		uint64_t addr_64;   /**< Makes sure addr is always 64 bits */
	};
	size_t len;               /**< Length of the segment. */
	size_t hugepage_sz;       /**< The pagesize of underlying memory */
	int32_t socket_id;          /**< NUMA socket ID. */
	uint32_t nchannel;          /**< Number of channels. */
	uint32_t nrank;             /**< Number of ranks. */
} __attribute__((__packed__));


/**
 * Get the layout of the available physical memory.
 *
 * It can be useful for an application to have the full physical
 * memory layout to decide the size of a memory zone to reserve. This
 * table is stored in rte_config (see rte_eal_get_configuration()).
 *
 * @return
 *  - On success, return a pointer to a read-only table of struct
 *    rte_physmem_desc elements, containing the layout of all
 *    addressable physical memory. The last element of the table
 *    contains a NULL address.
 *  - On error, return NULL. This should not happen since it is a fatal
 *    error that will probably cause the entire system to panic.
 */
const struct rte_memseg *rte_eal_get_physmem_layout(void);

/**
 * Dump the physical memory layout to the console.
 */
void rte_dump_physmem_layout(void);

/**
 * Get the total amount of available physical memory.
 *
 * @return
 *    The total amount of available physical memory in bytes.
 */
uint64_t rte_eal_get_physmem_size(void);

/**
 * Get the number of memory channels.
 *
 * @return
 *   The number of memory channels on the system. The value is 0 if unknown
 *   or not the same on all devices.
 */
unsigned rte_memory_get_nchannel(void);

/**
 * Get the number of memory ranks.
 *
 * @return
 *   The number of memory ranks on the system. The value is 0 if unknown or
 *   not the same on all devices.
 */
unsigned rte_memory_get_nrank(void);

#ifdef __cplusplus
}
#endif

#endif /* _RTE_MEMORY_H_ */