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1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.02/*******************************************************************************3 *4 * Module Name: rslist - Linked list utilities5 *6 ******************************************************************************/7 8#include <acpi/acpi.h>9#include "accommon.h"10#include "acresrc.h"11 12#define _COMPONENT ACPI_RESOURCES13ACPI_MODULE_NAME("rslist")14 15/*******************************************************************************16 *17 * FUNCTION: acpi_rs_convert_aml_to_resources18 *19 * PARAMETERS: acpi_walk_aml_callback20 * resource_ptr - Pointer to the buffer that will21 * contain the output structures22 *23 * RETURN: Status24 *25 * DESCRIPTION: Convert an AML resource to an internal representation of the26 * resource that is aligned and easier to access.27 *28 ******************************************************************************/29acpi_status30acpi_rs_convert_aml_to_resources(u8 * aml,31 u32 length,32 u32 offset, u8 resource_index, void **context)33{34 struct acpi_resource **resource_ptr =35 ACPI_CAST_INDIRECT_PTR(struct acpi_resource, context);36 struct acpi_resource *resource;37 union aml_resource *aml_resource;38 struct acpi_rsconvert_info *conversion_table;39 acpi_status status;40 41 ACPI_FUNCTION_TRACE(rs_convert_aml_to_resources);42 43 /*44 * Check that the input buffer and all subsequent pointers into it45 * are aligned on a native word boundary. Most important on IA6446 */47 resource = *resource_ptr;48 if (ACPI_IS_MISALIGNED(resource)) {49 ACPI_WARNING((AE_INFO,50 "Misaligned resource pointer %p", resource));51 }52 53 /* Get the appropriate conversion info table */54 55 aml_resource = ACPI_CAST_PTR(union aml_resource, aml);56 57 if (acpi_ut_get_resource_type(aml) == ACPI_RESOURCE_NAME_SERIAL_BUS) {58 59 /* Avoid undefined behavior: member access within misaligned address */60 61 struct aml_resource_common_serialbus common_serial_bus;62 memcpy(&common_serial_bus, aml_resource,63 sizeof(common_serial_bus));64 65 if (common_serial_bus.type > AML_RESOURCE_MAX_SERIALBUSTYPE) {66 conversion_table = NULL;67 } else {68 /* This is an I2C, SPI, UART, or CSI2 serial_bus descriptor */69 70 conversion_table =71 acpi_gbl_convert_resource_serial_bus_dispatch72 [common_serial_bus.type];73 }74 } else {75 conversion_table =76 acpi_gbl_get_resource_dispatch[resource_index];77 }78 79 if (!conversion_table) {80 ACPI_ERROR((AE_INFO,81 "Invalid/unsupported resource descriptor: Type 0x%2.2X",82 resource_index));83 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);84 }85 86 /* Convert the AML byte stream resource to a local resource struct */87 88 status =89 acpi_rs_convert_aml_to_resource(resource, aml_resource,90 conversion_table);91 if (ACPI_FAILURE(status)) {92 ACPI_EXCEPTION((AE_INFO, status,93 "Could not convert AML resource (Type 0x%X)",94 *aml));95 return_ACPI_STATUS(status);96 }97 98 if (!resource->length) {99 ACPI_EXCEPTION((AE_INFO, status,100 "Zero-length resource returned from RsConvertAmlToResource"));101 }102 103 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES,104 "Type %.2X, AmlLength %.2X InternalLength %.2X\n",105 acpi_ut_get_resource_type(aml), length,106 resource->length));107 108 /* Point to the next structure in the output buffer */109 110 *resource_ptr = ACPI_NEXT_RESOURCE(resource);111 return_ACPI_STATUS(AE_OK);112}113 114/*******************************************************************************115 *116 * FUNCTION: acpi_rs_convert_resources_to_aml117 *118 * PARAMETERS: resource - Pointer to the resource linked list119 * aml_size_needed - Calculated size of the byte stream120 * needed from calling acpi_rs_get_aml_length()121 * The size of the output_buffer is122 * guaranteed to be >= aml_size_needed123 * output_buffer - Pointer to the buffer that will124 * contain the byte stream125 *126 * RETURN: Status127 *128 * DESCRIPTION: Takes the resource linked list and parses it, creating a129 * byte stream of resources in the caller's output buffer130 *131 ******************************************************************************/132 133acpi_status134acpi_rs_convert_resources_to_aml(struct acpi_resource *resource,135 acpi_size aml_size_needed, u8 * output_buffer)136{137 u8 *aml = output_buffer;138 u8 *end_aml = output_buffer + aml_size_needed;139 struct acpi_rsconvert_info *conversion_table;140 acpi_status status;141 142 ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml);143 144 /* Walk the resource descriptor list, convert each descriptor */145 146 while (aml < end_aml) {147 148 /* Validate the (internal) Resource Type */149 150 if (resource->type > ACPI_RESOURCE_TYPE_MAX) {151 ACPI_ERROR((AE_INFO,152 "Invalid descriptor type (0x%X) in resource list",153 resource->type));154 return_ACPI_STATUS(AE_BAD_DATA);155 }156 157 /* Sanity check the length. It must not be zero, or we loop forever */158 159 if (!resource->length) {160 ACPI_ERROR((AE_INFO,161 "Invalid zero length descriptor in resource list\n"));162 return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH);163 }164 165 /* Perform the conversion */166 167 if (resource->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {168 if (resource->data.common_serial_bus.type >169 AML_RESOURCE_MAX_SERIALBUSTYPE) {170 conversion_table = NULL;171 } else {172 /* This is an I2C, SPI, UART or CSI2 serial_bus descriptor */173 174 conversion_table =175 acpi_gbl_convert_resource_serial_bus_dispatch176 [resource->data.common_serial_bus.type];177 }178 } else {179 conversion_table =180 acpi_gbl_set_resource_dispatch[resource->type];181 }182 183 if (!conversion_table) {184 ACPI_ERROR((AE_INFO,185 "Invalid/unsupported resource descriptor: Type 0x%2.2X",186 resource->type));187 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE);188 }189 190 status = acpi_rs_convert_resource_to_aml(resource,191 ACPI_CAST_PTR(union192 aml_resource,193 aml),194 conversion_table);195 if (ACPI_FAILURE(status)) {196 ACPI_EXCEPTION((AE_INFO, status,197 "Could not convert resource (type 0x%X) to AML",198 resource->type));199 return_ACPI_STATUS(status);200 }201 202 /* Perform final sanity check on the new AML resource descriptor */203 204 status =205 acpi_ut_validate_resource(NULL,206 ACPI_CAST_PTR(union aml_resource,207 aml), NULL);208 if (ACPI_FAILURE(status)) {209 return_ACPI_STATUS(status);210 }211 212 /* Check for end-of-list, normal exit */213 214 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) {215 216 /* An End Tag indicates the end of the input Resource Template */217 218 return_ACPI_STATUS(AE_OK);219 }220 221 /*222 * Extract the total length of the new descriptor and set the223 * Aml to point to the next (output) resource descriptor224 */225 aml += acpi_ut_get_descriptor_length(aml);226 227 /* Point to the next input resource descriptor */228 229 resource = ACPI_NEXT_RESOURCE(resource);230 }231 232 /* Completed buffer, but did not find an end_tag resource descriptor */233 234 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG);235}236