/******************************************************************************
   *
   * Module Name: utalloc - local memory allocation routines
   *
   *****************************************************************************/
  
  /*
   * Copyright (C) 2000 - 2013, Intel Corp.
   * All rights reserved.
   *
   * 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,
   *    without modification.
   * 2. Redistributions in binary form must reproduce at minimum a disclaimer
   *    substantially similar to the "NO WARRANTY" disclaimer below
   *    ("Disclaimer") and any redistribution must be conditioned upon
   *    including a substantially similar Disclaimer requirement for further
   *    binary redistribution.
   * 3. Neither the names of the above-listed copyright holders nor the names
   *    of any contributors may be used to endorse or promote products derived
   *    from this software without specific prior written permission.
   *
   * Alternatively, this software may be distributed under the terms of the
   * GNU General Public License ("GPL") version 2 as published by the Free
   * Software Foundation.
   *
   * NO WARRANTY
   * 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 MERCHANTIBILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
   */
  
  #include <acpi/acpi.h>
  #include "accommon.h"
  #include "acdebug.h"
  
  #define _COMPONENT          ACPI_UTILITIES
  ACPI_MODULE_NAME("utalloc")
  
  #if !defined (USE_NATIVE_ALLOCATE_ZEROED)
  /*******************************************************************************
   *
   * FUNCTION:    acpi_os_allocate_zeroed
   *
   * PARAMETERS:  size                - Size of the allocation
   *
   * RETURN:      Address of the allocated memory on success, NULL on failure.
   *
   * DESCRIPTION: Subsystem equivalent of calloc. Allocate and zero memory.
   *              This is the default implementation. Can be overridden via the
   *              USE_NATIVE_ALLOCATE_ZEROED flag.
   *
   ******************************************************************************/
  void *acpi_os_allocate_zeroed(acpi_size size)
  {
  	void *allocation;
  
  	ACPI_FUNCTION_ENTRY();
  
  	allocation = acpi_os_allocate(size);
  	if (allocation) {
  
  		/* Clear the memory block */
  
  		ACPI_MEMSET(allocation, 0, size);
  	}
  
  	return (allocation);
  }
  
  #endif				/* !USE_NATIVE_ALLOCATE_ZEROED */
  
  /*******************************************************************************
   *
   * FUNCTION:    acpi_ut_create_caches
   *
   * PARAMETERS:  None
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Create all local caches
   *
   ******************************************************************************/
  
  acpi_status acpi_ut_create_caches(void)
  {
  	acpi_status status;
  
  	/* Object Caches, for frequently used objects */
  
  	status =
  	    acpi_os_create_cache("Acpi-Namespace",
  				 sizeof(struct acpi_namespace_node),
  				 ACPI_MAX_NAMESPACE_CACHE_DEPTH,
  				 &acpi_gbl_namespace_cache);
  	if (ACPI_FAILURE(status)) {
  		return (status);
  	}
  
  	status =
  	    acpi_os_create_cache("Acpi-State", sizeof(union acpi_generic_state),
  				 ACPI_MAX_STATE_CACHE_DEPTH,
  				 &acpi_gbl_state_cache);
  	if (ACPI_FAILURE(status)) {
  		return (status);
  	}
  
  	status =
  	    acpi_os_create_cache("Acpi-Parse",
  				 sizeof(struct acpi_parse_obj_common),
  				 ACPI_MAX_PARSE_CACHE_DEPTH,
  				 &acpi_gbl_ps_node_cache);
  	if (ACPI_FAILURE(status)) {
  		return (status);
  	}
  
  	status =
  	    acpi_os_create_cache("Acpi-ParseExt",
  				 sizeof(struct acpi_parse_obj_named),
  				 ACPI_MAX_EXTPARSE_CACHE_DEPTH,
  				 &acpi_gbl_ps_node_ext_cache);
  	if (ACPI_FAILURE(status)) {
  		return (status);
  	}
  
  	status =
  	    acpi_os_create_cache("Acpi-Operand",
  				 sizeof(union acpi_operand_object),
  				 ACPI_MAX_OBJECT_CACHE_DEPTH,
  				 &acpi_gbl_operand_cache);
  	if (ACPI_FAILURE(status)) {
  		return (status);
  	}
  #ifdef ACPI_DBG_TRACK_ALLOCATIONS
  
  	/* Memory allocation lists */
  
  	status = acpi_ut_create_list("Acpi-Global", 0, &acpi_gbl_global_list);
  	if (ACPI_FAILURE(status)) {
  		return (status);
  	}
  
  	status =
  	    acpi_ut_create_list("Acpi-Namespace",
  				sizeof(struct acpi_namespace_node),
  				&acpi_gbl_ns_node_list);
  	if (ACPI_FAILURE(status)) {
  		return (status);
  	}
  #endif
  
  	return (AE_OK);
  }
  
  /*******************************************************************************
   *
   * FUNCTION:    acpi_ut_delete_caches
   *
   * PARAMETERS:  None
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Purge and delete all local caches
   *
   ******************************************************************************/
  
  acpi_status acpi_ut_delete_caches(void)
  {
  #ifdef ACPI_DBG_TRACK_ALLOCATIONS
  	char buffer[7];
  
  	if (acpi_gbl_display_final_mem_stats) {
  		ACPI_STRCPY(buffer, "MEMORY");
  		(void)acpi_db_display_statistics(buffer);
  	}
  #endif
  
  	(void)acpi_os_delete_cache(acpi_gbl_namespace_cache);
  	acpi_gbl_namespace_cache = NULL;
  
  	(void)acpi_os_delete_cache(acpi_gbl_state_cache);
  	acpi_gbl_state_cache = NULL;
  
  	(void)acpi_os_delete_cache(acpi_gbl_operand_cache);
  	acpi_gbl_operand_cache = NULL;
  
  	(void)acpi_os_delete_cache(acpi_gbl_ps_node_cache);
  	acpi_gbl_ps_node_cache = NULL;
  
  	(void)acpi_os_delete_cache(acpi_gbl_ps_node_ext_cache);
  	acpi_gbl_ps_node_ext_cache = NULL;
  
  #ifdef ACPI_DBG_TRACK_ALLOCATIONS
  
  	/* Debug only - display leftover memory allocation, if any */
  
  	acpi_ut_dump_allocations(ACPI_UINT32_MAX, NULL);
  
  	/* Free memory lists */
  
  	acpi_os_free(acpi_gbl_global_list);
  	acpi_gbl_global_list = NULL;
  
  	acpi_os_free(acpi_gbl_ns_node_list);
  	acpi_gbl_ns_node_list = NULL;
  #endif
  
  	return (AE_OK);
  }
  
  /*******************************************************************************
   *
   * FUNCTION:    acpi_ut_validate_buffer
   *
   * PARAMETERS:  buffer              - Buffer descriptor to be validated
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Perform parameter validation checks on an struct acpi_buffer
   *
   ******************************************************************************/
  
  acpi_status acpi_ut_validate_buffer(struct acpi_buffer * buffer)
  {
  
  	/* Obviously, the structure pointer must be valid */
  
  	if (!buffer) {
  		return (AE_BAD_PARAMETER);
  	}
  
  	/* Special semantics for the length */
  
  	if ((buffer->length == ACPI_NO_BUFFER) ||
  	    (buffer->length == ACPI_ALLOCATE_BUFFER) ||
  	    (buffer->length == ACPI_ALLOCATE_LOCAL_BUFFER)) {
  		return (AE_OK);
  	}
  
  	/* Length is valid, the buffer pointer must be also */
  
  	if (!buffer->pointer) {
  		return (AE_BAD_PARAMETER);
  	}
  
  	return (AE_OK);
  }
  
  /*******************************************************************************
   *
   * FUNCTION:    acpi_ut_initialize_buffer
   *
   * PARAMETERS:  buffer              - Buffer to be validated
   *              required_length     - Length needed
   *
   * RETURN:      Status
   *
   * DESCRIPTION: Validate that the buffer is of the required length or
   *              allocate a new buffer. Returned buffer is always zeroed.
   *
   ******************************************************************************/
  
  acpi_status
  acpi_ut_initialize_buffer(struct acpi_buffer * buffer,
  			  acpi_size required_length)
  {
  	acpi_size input_buffer_length;
  
  	/* Parameter validation */
  
  	if (!buffer || !required_length) {
  		return (AE_BAD_PARAMETER);
  	}
  
  	/*
  	 * Buffer->Length is used as both an input and output parameter. Get the
  	 * input actual length and set the output required buffer length.
  	 */
  	input_buffer_length = buffer->length;
  	buffer->length = required_length;
  
  	/*
  	 * The input buffer length contains the actual buffer length, or the type
  	 * of buffer to be allocated by this routine.
  	 */
  	switch (input_buffer_length) {
  	case ACPI_NO_BUFFER:
  
  		/* Return the exception (and the required buffer length) */
  
  		return (AE_BUFFER_OVERFLOW);
  
  	case ACPI_ALLOCATE_BUFFER:
  		/*
  		 * Allocate a new buffer. We directectly call acpi_os_allocate here to
  		 * purposefully bypass the (optionally enabled) internal allocation
  		 * tracking mechanism since we only want to track internal
  		 * allocations. Note: The caller should use acpi_os_free to free this
  		 * buffer created via ACPI_ALLOCATE_BUFFER.
  		 */
  		buffer->pointer = acpi_os_allocate(required_length);
  		break;
  
  	case ACPI_ALLOCATE_LOCAL_BUFFER:
  
  		/* Allocate a new buffer with local interface to allow tracking */
  
  		buffer->pointer = ACPI_ALLOCATE(required_length);
  		break;
  
  	default:
  
  		/* Existing buffer: Validate the size of the buffer */
  
  		if (input_buffer_length < required_length) {
  			return (AE_BUFFER_OVERFLOW);
  		}
  		break;
  	}
  
  	/* Validate allocation from above or input buffer pointer */
  
  	if (!buffer->pointer) {
  		return (AE_NO_MEMORY);
  	}
  
  	/* Have a valid buffer, clear it */
  
  	ACPI_MEMSET(buffer->pointer, 0, required_length);
  	return (AE_OK);
  }