--- /dev/null
+/*******************************************************************************
+ *
+ * Module Name: utresrc - Resource management utilities
+ *
+ ******************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2015, 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 "acresrc.h"
+
+#define _COMPONENT ACPI_UTILITIES
+ACPI_MODULE_NAME("utresrc")
+
+#if defined(ACPI_DEBUG_OUTPUT) || defined (ACPI_DISASSEMBLER) || defined (ACPI_DEBUGGER)
+/*
+ * Strings used to decode resource descriptors.
+ * Used by both the disassembler and the debugger resource dump routines
+ */
+const char *acpi_gbl_bm_decode[] = {
+ "NotBusMaster",
+ "BusMaster"
+};
+
+const char *acpi_gbl_config_decode[] = {
+ "0 - Good Configuration",
+ "1 - Acceptable Configuration",
+ "2 - Suboptimal Configuration",
+ "3 - ***Invalid Configuration***",
+};
+
+const char *acpi_gbl_consume_decode[] = {
+ "ResourceProducer",
+ "ResourceConsumer"
+};
+
+const char *acpi_gbl_dec_decode[] = {
+ "PosDecode",
+ "SubDecode"
+};
+
+const char *acpi_gbl_he_decode[] = {
+ "Level",
+ "Edge"
+};
+
+const char *acpi_gbl_io_decode[] = {
+ "Decode10",
+ "Decode16"
+};
+
+const char *acpi_gbl_ll_decode[] = {
+ "ActiveHigh",
+ "ActiveLow",
+ "ActiveBoth",
+ "Reserved"
+};
+
+const char *acpi_gbl_max_decode[] = {
+ "MaxNotFixed",
+ "MaxFixed"
+};
+
+const char *acpi_gbl_mem_decode[] = {
+ "NonCacheable",
+ "Cacheable",
+ "WriteCombining",
+ "Prefetchable"
+};
+
+const char *acpi_gbl_min_decode[] = {
+ "MinNotFixed",
+ "MinFixed"
+};
+
+const char *acpi_gbl_mtp_decode[] = {
+ "AddressRangeMemory",
+ "AddressRangeReserved",
+ "AddressRangeACPI",
+ "AddressRangeNVS"
+};
+
+const char *acpi_gbl_rng_decode[] = {
+ "InvalidRanges",
+ "NonISAOnlyRanges",
+ "ISAOnlyRanges",
+ "EntireRange"
+};
+
+const char *acpi_gbl_rw_decode[] = {
+ "ReadOnly",
+ "ReadWrite"
+};
+
+const char *acpi_gbl_shr_decode[] = {
+ "Exclusive",
+ "Shared",
+ "ExclusiveAndWake", /* ACPI 5.0 */
+ "SharedAndWake" /* ACPI 5.0 */
+};
+
+const char *acpi_gbl_siz_decode[] = {
+ "Transfer8",
+ "Transfer8_16",
+ "Transfer16",
+ "InvalidSize"
+};
+
+const char *acpi_gbl_trs_decode[] = {
+ "DenseTranslation",
+ "SparseTranslation"
+};
+
+const char *acpi_gbl_ttp_decode[] = {
+ "TypeStatic",
+ "TypeTranslation"
+};
+
+const char *acpi_gbl_typ_decode[] = {
+ "Compatibility",
+ "TypeA",
+ "TypeB",
+ "TypeF"
+};
+
+const char *acpi_gbl_ppc_decode[] = {
+ "PullDefault",
+ "PullUp",
+ "PullDown",
+ "PullNone"
+};
+
+const char *acpi_gbl_ior_decode[] = {
+ "IoRestrictionNone",
+ "IoRestrictionInputOnly",
+ "IoRestrictionOutputOnly",
+ "IoRestrictionNoneAndPreserve"
+};
+
+const char *acpi_gbl_dts_decode[] = {
+ "Width8bit",
+ "Width16bit",
+ "Width32bit",
+ "Width64bit",
+ "Width128bit",
+ "Width256bit",
+};
+
+/* GPIO connection type */
+
+const char *acpi_gbl_ct_decode[] = {
+ "Interrupt",
+ "I/O"
+};
+
+/* Serial bus type */
+
+const char *acpi_gbl_sbt_decode[] = {
+ "/* UNKNOWN serial bus type */",
+ "I2C",
+ "SPI",
+ "UART"
+};
+
+/* I2C serial bus access mode */
+
+const char *acpi_gbl_am_decode[] = {
+ "AddressingMode7Bit",
+ "AddressingMode10Bit"
+};
+
+/* I2C serial bus slave mode */
+
+const char *acpi_gbl_sm_decode[] = {
+ "ControllerInitiated",
+ "DeviceInitiated"
+};
+
+/* SPI serial bus wire mode */
+
+const char *acpi_gbl_wm_decode[] = {
+ "FourWireMode",
+ "ThreeWireMode"
+};
+
+/* SPI serial clock phase */
+
+const char *acpi_gbl_cph_decode[] = {
+ "ClockPhaseFirst",
+ "ClockPhaseSecond"
+};
+
+/* SPI serial bus clock polarity */
+
+const char *acpi_gbl_cpo_decode[] = {
+ "ClockPolarityLow",
+ "ClockPolarityHigh"
+};
+
+/* SPI serial bus device polarity */
+
+const char *acpi_gbl_dp_decode[] = {
+ "PolarityLow",
+ "PolarityHigh"
+};
+
+/* UART serial bus endian */
+
+const char *acpi_gbl_ed_decode[] = {
+ "LittleEndian",
+ "BigEndian"
+};
+
+/* UART serial bus bits per byte */
+
+const char *acpi_gbl_bpb_decode[] = {
+ "DataBitsFive",
+ "DataBitsSix",
+ "DataBitsSeven",
+ "DataBitsEight",
+ "DataBitsNine",
+ "/* UNKNOWN Bits per byte */",
+ "/* UNKNOWN Bits per byte */",
+ "/* UNKNOWN Bits per byte */"
+};
+
+/* UART serial bus stop bits */
+
+const char *acpi_gbl_sb_decode[] = {
+ "StopBitsZero",
+ "StopBitsOne",
+ "StopBitsOnePlusHalf",
+ "StopBitsTwo"
+};
+
+/* UART serial bus flow control */
+
+const char *acpi_gbl_fc_decode[] = {
+ "FlowControlNone",
+ "FlowControlHardware",
+ "FlowControlXON",
+ "/* UNKNOWN flow control keyword */"
+};
+
+/* UART serial bus parity type */
+
+const char *acpi_gbl_pt_decode[] = {
+ "ParityTypeNone",
+ "ParityTypeEven",
+ "ParityTypeOdd",
+ "ParityTypeMark",
+ "ParityTypeSpace",
+ "/* UNKNOWN parity keyword */",
+ "/* UNKNOWN parity keyword */",
+ "/* UNKNOWN parity keyword */"
+};
+
+#endif
+
+/*
+ * Base sizes of the raw AML resource descriptors, indexed by resource type.
+ * Zero indicates a reserved (and therefore invalid) resource type.
+ */
+const u8 acpi_gbl_resource_aml_sizes[] = {
+ /* Small descriptors */
+
+ 0,
+ 0,
+ 0,
+ 0,
+ ACPI_AML_SIZE_SMALL(struct aml_resource_irq),
+ ACPI_AML_SIZE_SMALL(struct aml_resource_dma),
+ ACPI_AML_SIZE_SMALL(struct aml_resource_start_dependent),
+ ACPI_AML_SIZE_SMALL(struct aml_resource_end_dependent),
+ ACPI_AML_SIZE_SMALL(struct aml_resource_io),
+ ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_io),
+ ACPI_AML_SIZE_SMALL(struct aml_resource_fixed_dma),
+ 0,
+ 0,
+ 0,
+ ACPI_AML_SIZE_SMALL(struct aml_resource_vendor_small),
+ ACPI_AML_SIZE_SMALL(struct aml_resource_end_tag),
+
+ /* Large descriptors */
+
+ 0,
+ ACPI_AML_SIZE_LARGE(struct aml_resource_memory24),
+ ACPI_AML_SIZE_LARGE(struct aml_resource_generic_register),
+ 0,
+ ACPI_AML_SIZE_LARGE(struct aml_resource_vendor_large),
+ ACPI_AML_SIZE_LARGE(struct aml_resource_memory32),
+ ACPI_AML_SIZE_LARGE(struct aml_resource_fixed_memory32),
+ ACPI_AML_SIZE_LARGE(struct aml_resource_address32),
+ ACPI_AML_SIZE_LARGE(struct aml_resource_address16),
+ ACPI_AML_SIZE_LARGE(struct aml_resource_extended_irq),
+ ACPI_AML_SIZE_LARGE(struct aml_resource_address64),
+ ACPI_AML_SIZE_LARGE(struct aml_resource_extended_address64),
+ ACPI_AML_SIZE_LARGE(struct aml_resource_gpio),
+ 0,
+ ACPI_AML_SIZE_LARGE(struct aml_resource_common_serialbus),
+};
+
+const u8 acpi_gbl_resource_aml_serial_bus_sizes[] = {
+ 0,
+ ACPI_AML_SIZE_LARGE(struct aml_resource_i2c_serialbus),
+ ACPI_AML_SIZE_LARGE(struct aml_resource_spi_serialbus),
+ ACPI_AML_SIZE_LARGE(struct aml_resource_uart_serialbus),
+};
+
+/*
+ * Resource types, used to validate the resource length field.
+ * The length of fixed-length types must match exactly, variable
+ * lengths must meet the minimum required length, etc.
+ * Zero indicates a reserved (and therefore invalid) resource type.
+ */
+static const u8 acpi_gbl_resource_types[] = {
+ /* Small descriptors */
+
+ 0,
+ 0,
+ 0,
+ 0,
+ ACPI_SMALL_VARIABLE_LENGTH, /* 04 IRQ */
+ ACPI_FIXED_LENGTH, /* 05 DMA */
+ ACPI_SMALL_VARIABLE_LENGTH, /* 06 start_dependent_functions */
+ ACPI_FIXED_LENGTH, /* 07 end_dependent_functions */
+ ACPI_FIXED_LENGTH, /* 08 IO */
+ ACPI_FIXED_LENGTH, /* 09 fixed_IO */
+ ACPI_FIXED_LENGTH, /* 0A fixed_DMA */
+ 0,
+ 0,
+ 0,
+ ACPI_VARIABLE_LENGTH, /* 0E vendor_short */
+ ACPI_FIXED_LENGTH, /* 0F end_tag */
+
+ /* Large descriptors */
+
+ 0,
+ ACPI_FIXED_LENGTH, /* 01 Memory24 */
+ ACPI_FIXED_LENGTH, /* 02 generic_register */
+ 0,
+ ACPI_VARIABLE_LENGTH, /* 04 vendor_long */
+ ACPI_FIXED_LENGTH, /* 05 Memory32 */
+ ACPI_FIXED_LENGTH, /* 06 memory32_fixed */
+ ACPI_VARIABLE_LENGTH, /* 07 Dword* address */
+ ACPI_VARIABLE_LENGTH, /* 08 Word* address */
+ ACPI_VARIABLE_LENGTH, /* 09 extended_IRQ */
+ ACPI_VARIABLE_LENGTH, /* 0A Qword* address */
+ ACPI_FIXED_LENGTH, /* 0B Extended* address */
+ ACPI_VARIABLE_LENGTH, /* 0C Gpio* */
+ 0,
+ ACPI_VARIABLE_LENGTH /* 0E *serial_bus */
+};
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_walk_aml_resources
+ *
+ * PARAMETERS: walk_state - Current walk info
+ * PARAMETERS: aml - Pointer to the raw AML resource template
+ * aml_length - Length of the entire template
+ * user_function - Called once for each descriptor found. If
+ * NULL, a pointer to the end_tag is returned
+ * context - Passed to user_function
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Walk a raw AML resource list(buffer). User function called
+ * once for each resource found.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ut_walk_aml_resources(struct acpi_walk_state *walk_state,
+ u8 *aml,
+ acpi_size aml_length,
+ acpi_walk_aml_callback user_function, void **context)
+{
+ acpi_status status;
+ u8 *end_aml;
+ u8 resource_index;
+ u32 length;
+ u32 offset = 0;
+ u8 end_tag[2] = { 0x79, 0x00 };
+
+ ACPI_FUNCTION_TRACE(ut_walk_aml_resources);
+
+ /* The absolute minimum resource template is one end_tag descriptor */
+
+ if (aml_length < sizeof(struct aml_resource_end_tag)) {
+ return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
+ }
+
+ /* Point to the end of the resource template buffer */
+
+ end_aml = aml + aml_length;
+
+ /* Walk the byte list, abort on any invalid descriptor type or length */
+
+ while (aml < end_aml) {
+
+ /* Validate the Resource Type and Resource Length */
+
+ status =
+ acpi_ut_validate_resource(walk_state, aml, &resource_index);
+ if (ACPI_FAILURE(status)) {
+ /*
+ * Exit on failure. Cannot continue because the descriptor length
+ * may be bogus also.
+ */
+ return_ACPI_STATUS(status);
+ }
+
+ /* Get the length of this descriptor */
+
+ length = acpi_ut_get_descriptor_length(aml);
+
+ /* Invoke the user function */
+
+ if (user_function) {
+ status =
+ user_function(aml, length, offset, resource_index,
+ context);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+ }
+
+ /* An end_tag descriptor terminates this resource template */
+
+ if (acpi_ut_get_resource_type(aml) ==
+ ACPI_RESOURCE_NAME_END_TAG) {
+ /*
+ * There must be at least one more byte in the buffer for
+ * the 2nd byte of the end_tag
+ */
+ if ((aml + 1) >= end_aml) {
+ return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
+ }
+
+ /* Return the pointer to the end_tag if requested */
+
+ if (!user_function) {
+ *context = aml;
+ }
+
+ /* Normal exit */
+
+ return_ACPI_STATUS(AE_OK);
+ }
+
+ aml += length;
+ offset += length;
+ }
+
+ /* Did not find an end_tag descriptor */
+
+ if (user_function) {
+
+ /* Insert an end_tag anyway. acpi_rs_get_list_length always leaves room */
+
+ (void)acpi_ut_validate_resource(walk_state, end_tag,
+ &resource_index);
+ status =
+ user_function(end_tag, 2, offset, resource_index, context);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+ }
+
+ return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_validate_resource
+ *
+ * PARAMETERS: walk_state - Current walk info
+ * aml - Pointer to the raw AML resource descriptor
+ * return_index - Where the resource index is returned. NULL
+ * if the index is not required.
+ *
+ * RETURN: Status, and optionally the Index into the global resource tables
+ *
+ * DESCRIPTION: Validate an AML resource descriptor by checking the Resource
+ * Type and Resource Length. Returns an index into the global
+ * resource information/dispatch tables for later use.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ut_validate_resource(struct acpi_walk_state *walk_state,
+ void *aml, u8 *return_index)
+{
+ union aml_resource *aml_resource;
+ u8 resource_type;
+ u8 resource_index;
+ acpi_rs_length resource_length;
+ acpi_rs_length minimum_resource_length;
+
+ ACPI_FUNCTION_ENTRY();
+
+ /*
+ * 1) Validate the resource_type field (Byte 0)
+ */
+ resource_type = ACPI_GET8(aml);
+
+ /*
+ * Byte 0 contains the descriptor name (Resource Type)
+ * Examine the large/small bit in the resource header
+ */
+ if (resource_type & ACPI_RESOURCE_NAME_LARGE) {
+
+ /* Verify the large resource type (name) against the max */
+
+ if (resource_type > ACPI_RESOURCE_NAME_LARGE_MAX) {
+ goto invalid_resource;
+ }
+
+ /*
+ * Large Resource Type -- bits 6:0 contain the name
+ * Translate range 0x80-0x8B to index range 0x10-0x1B
+ */
+ resource_index = (u8) (resource_type - 0x70);
+ } else {
+ /*
+ * Small Resource Type -- bits 6:3 contain the name
+ * Shift range to index range 0x00-0x0F
+ */
+ resource_index = (u8)
+ ((resource_type & ACPI_RESOURCE_NAME_SMALL_MASK) >> 3);
+ }
+
+ /*
+ * Check validity of the resource type, via acpi_gbl_resource_types. Zero
+ * indicates an invalid resource.
+ */
+ if (!acpi_gbl_resource_types[resource_index]) {
+ goto invalid_resource;
+ }
+
+ /*
+ * Validate the resource_length field. This ensures that the length
+ * is at least reasonable, and guarantees that it is non-zero.
+ */
+ resource_length = acpi_ut_get_resource_length(aml);
+ minimum_resource_length = acpi_gbl_resource_aml_sizes[resource_index];
+
+ /* Validate based upon the type of resource - fixed length or variable */
+
+ switch (acpi_gbl_resource_types[resource_index]) {
+ case ACPI_FIXED_LENGTH:
+
+ /* Fixed length resource, length must match exactly */
+
+ if (resource_length != minimum_resource_length) {
+ goto bad_resource_length;
+ }
+ break;
+
+ case ACPI_VARIABLE_LENGTH:
+
+ /* Variable length resource, length must be at least the minimum */
+
+ if (resource_length < minimum_resource_length) {
+ goto bad_resource_length;
+ }
+ break;
+
+ case ACPI_SMALL_VARIABLE_LENGTH:
+
+ /* Small variable length resource, length can be (Min) or (Min-1) */
+
+ if ((resource_length > minimum_resource_length) ||
+ (resource_length < (minimum_resource_length - 1))) {
+ goto bad_resource_length;
+ }
+ break;
+
+ default:
+
+ /* Shouldn't happen (because of validation earlier), but be sure */
+
+ goto invalid_resource;
+ }
+
+ aml_resource = ACPI_CAST_PTR(union aml_resource, aml);
+ if (resource_type == ACPI_RESOURCE_NAME_SERIAL_BUS) {
+
+ /* Validate the bus_type field */
+
+ if ((aml_resource->common_serial_bus.type == 0) ||
+ (aml_resource->common_serial_bus.type >
+ AML_RESOURCE_MAX_SERIALBUSTYPE)) {
+ if (walk_state) {
+ ACPI_ERROR((AE_INFO,
+ "Invalid/unsupported SerialBus resource descriptor: BusType 0x%2.2X",
+ aml_resource->common_serial_bus.
+ type));
+ }
+ return (AE_AML_INVALID_RESOURCE_TYPE);
+ }
+ }
+
+ /* Optionally return the resource table index */
+
+ if (return_index) {
+ *return_index = resource_index;
+ }
+
+ return (AE_OK);
+
+invalid_resource:
+
+ if (walk_state) {
+ ACPI_ERROR((AE_INFO,
+ "Invalid/unsupported resource descriptor: Type 0x%2.2X",
+ resource_type));
+ }
+ return (AE_AML_INVALID_RESOURCE_TYPE);
+
+bad_resource_length:
+
+ if (walk_state) {
+ ACPI_ERROR((AE_INFO,
+ "Invalid resource descriptor length: Type "
+ "0x%2.2X, Length 0x%4.4X, MinLength 0x%4.4X",
+ resource_type, resource_length,
+ minimum_resource_length));
+ }
+ return (AE_AML_BAD_RESOURCE_LENGTH);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_get_resource_type
+ *
+ * PARAMETERS: aml - Pointer to the raw AML resource descriptor
+ *
+ * RETURN: The Resource Type with no extraneous bits (except the
+ * Large/Small descriptor bit -- this is left alone)
+ *
+ * DESCRIPTION: Extract the Resource Type/Name from the first byte of
+ * a resource descriptor.
+ *
+ ******************************************************************************/
+
+u8 acpi_ut_get_resource_type(void *aml)
+{
+ ACPI_FUNCTION_ENTRY();
+
+ /*
+ * Byte 0 contains the descriptor name (Resource Type)
+ * Examine the large/small bit in the resource header
+ */
+ if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
+
+ /* Large Resource Type -- bits 6:0 contain the name */
+
+ return (ACPI_GET8(aml));
+ } else {
+ /* Small Resource Type -- bits 6:3 contain the name */
+
+ return ((u8) (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_SMALL_MASK));
+ }
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_get_resource_length
+ *
+ * PARAMETERS: aml - Pointer to the raw AML resource descriptor
+ *
+ * RETURN: Byte Length
+ *
+ * DESCRIPTION: Get the "Resource Length" of a raw AML descriptor. By
+ * definition, this does not include the size of the descriptor
+ * header or the length field itself.
+ *
+ ******************************************************************************/
+
+u16 acpi_ut_get_resource_length(void *aml)
+{
+ acpi_rs_length resource_length;
+
+ ACPI_FUNCTION_ENTRY();
+
+ /*
+ * Byte 0 contains the descriptor name (Resource Type)
+ * Examine the large/small bit in the resource header
+ */
+ if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
+
+ /* Large Resource type -- bytes 1-2 contain the 16-bit length */
+
+ ACPI_MOVE_16_TO_16(&resource_length, ACPI_ADD_PTR(u8, aml, 1));
+
+ } else {
+ /* Small Resource type -- bits 2:0 of byte 0 contain the length */
+
+ resource_length = (u16) (ACPI_GET8(aml) &
+ ACPI_RESOURCE_NAME_SMALL_LENGTH_MASK);
+ }
+
+ return (resource_length);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_get_resource_header_length
+ *
+ * PARAMETERS: aml - Pointer to the raw AML resource descriptor
+ *
+ * RETURN: Length of the AML header (depends on large/small descriptor)
+ *
+ * DESCRIPTION: Get the length of the header for this resource.
+ *
+ ******************************************************************************/
+
+u8 acpi_ut_get_resource_header_length(void *aml)
+{
+ ACPI_FUNCTION_ENTRY();
+
+ /* Examine the large/small bit in the resource header */
+
+ if (ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) {
+ return (sizeof(struct aml_resource_large_header));
+ } else {
+ return (sizeof(struct aml_resource_small_header));
+ }
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_get_descriptor_length
+ *
+ * PARAMETERS: aml - Pointer to the raw AML resource descriptor
+ *
+ * RETURN: Byte length
+ *
+ * DESCRIPTION: Get the total byte length of a raw AML descriptor, including the
+ * length of the descriptor header and the length field itself.
+ * Used to walk descriptor lists.
+ *
+ ******************************************************************************/
+
+u32 acpi_ut_get_descriptor_length(void *aml)
+{
+ ACPI_FUNCTION_ENTRY();
+
+ /*
+ * Get the Resource Length (does not include header length) and add
+ * the header length (depends on if this is a small or large resource)
+ */
+ return (acpi_ut_get_resource_length(aml) +
+ acpi_ut_get_resource_header_length(aml));
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ut_get_resource_end_tag
+ *
+ * PARAMETERS: obj_desc - The resource template buffer object
+ * end_tag - Where the pointer to the end_tag is returned
+ *
+ * RETURN: Status, pointer to the end tag
+ *
+ * DESCRIPTION: Find the end_tag resource descriptor in an AML resource template
+ * Note: allows a buffer length of zero.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ut_get_resource_end_tag(union acpi_operand_object *obj_desc, u8 **end_tag)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(ut_get_resource_end_tag);
+
+ /* Allow a buffer length of zero */
+
+ if (!obj_desc->buffer.length) {
+ *end_tag = obj_desc->buffer.pointer;
+ return_ACPI_STATUS(AE_OK);
+ }
+
+ /* Validate the template and get a pointer to the end_tag */
+
+ status = acpi_ut_walk_aml_resources(NULL, obj_desc->buffer.pointer,
+ obj_desc->buffer.length, NULL,
+ (void **)end_tag);
+
+ return_ACPI_STATUS(status);
+}
Code Review / kvmfornfv.git / blobdiff