1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /******************************************************************************* 3 * 4 * Module Name: rslist - Linked list utilities 5 * 6 ******************************************************************************/ 7 8 #include <acpi/acpi.h> 9 #include "accommon.h" 10 #include "acresrc.h" 11 12 #define _COMPONENT ACPI_RESOURCES 13 ACPI_MODULE_NAME("rslist") 14 15 /******************************************************************************* 16 * 17 * FUNCTION: acpi_rs_convert_aml_to_resources 18 * 19 * PARAMETERS: acpi_walk_aml_callback 20 * resource_ptr - Pointer to the buffer that will 21 * contain the output structures 22 * 23 * RETURN: Status 24 * 25 * DESCRIPTION: Convert an AML resource to an internal representation of the 26 * resource that is aligned and easier to access. 27 * 28 ******************************************************************************/ 29 acpi_status 30 acpi_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 it 45 * are aligned on a native word boundary. Most important on IA64 46 */ 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 if (aml_resource->common_serial_bus.type > 59 AML_RESOURCE_MAX_SERIALBUSTYPE) { 60 conversion_table = NULL; 61 } else { 62 /* This is an I2C, SPI, UART, or CSI2 serial_bus descriptor */ 63 64 conversion_table = 65 acpi_gbl_convert_resource_serial_bus_dispatch 66 [aml_resource->common_serial_bus.type]; 67 } 68 } else { 69 conversion_table = 70 acpi_gbl_get_resource_dispatch[resource_index]; 71 } 72 73 if (!conversion_table) { 74 ACPI_ERROR((AE_INFO, 75 "Invalid/unsupported resource descriptor: Type 0x%2.2X", 76 resource_index)); 77 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); 78 } 79 80 /* Convert the AML byte stream resource to a local resource struct */ 81 82 status = 83 acpi_rs_convert_aml_to_resource(resource, aml_resource, 84 conversion_table); 85 if (ACPI_FAILURE(status)) { 86 ACPI_EXCEPTION((AE_INFO, status, 87 "Could not convert AML resource (Type 0x%X)", 88 *aml)); 89 return_ACPI_STATUS(status); 90 } 91 92 if (!resource->length) { 93 ACPI_EXCEPTION((AE_INFO, status, 94 "Zero-length resource returned from RsConvertAmlToResource")); 95 } 96 97 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, 98 "Type %.2X, AmlLength %.2X InternalLength %.2X\n", 99 acpi_ut_get_resource_type(aml), length, 100 resource->length)); 101 102 /* Point to the next structure in the output buffer */ 103 104 *resource_ptr = ACPI_NEXT_RESOURCE(resource); 105 return_ACPI_STATUS(AE_OK); 106 } 107 108 /******************************************************************************* 109 * 110 * FUNCTION: acpi_rs_convert_resources_to_aml 111 * 112 * PARAMETERS: resource - Pointer to the resource linked list 113 * aml_size_needed - Calculated size of the byte stream 114 * needed from calling acpi_rs_get_aml_length() 115 * The size of the output_buffer is 116 * guaranteed to be >= aml_size_needed 117 * output_buffer - Pointer to the buffer that will 118 * contain the byte stream 119 * 120 * RETURN: Status 121 * 122 * DESCRIPTION: Takes the resource linked list and parses it, creating a 123 * byte stream of resources in the caller's output buffer 124 * 125 ******************************************************************************/ 126 127 acpi_status 128 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource, 129 acpi_size aml_size_needed, u8 * output_buffer) 130 { 131 u8 *aml = output_buffer; 132 u8 *end_aml = output_buffer + aml_size_needed; 133 struct acpi_rsconvert_info *conversion_table; 134 acpi_status status; 135 136 ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml); 137 138 /* Walk the resource descriptor list, convert each descriptor */ 139 140 while (aml < end_aml) { 141 142 /* Validate the (internal) Resource Type */ 143 144 if (resource->type > ACPI_RESOURCE_TYPE_MAX) { 145 ACPI_ERROR((AE_INFO, 146 "Invalid descriptor type (0x%X) in resource list", 147 resource->type)); 148 return_ACPI_STATUS(AE_BAD_DATA); 149 } 150 151 /* Sanity check the length. It must not be zero, or we loop forever */ 152 153 if (!resource->length) { 154 ACPI_ERROR((AE_INFO, 155 "Invalid zero length descriptor in resource list\n")); 156 return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH); 157 } 158 159 /* Perform the conversion */ 160 161 if (resource->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) { 162 if (resource->data.common_serial_bus.type > 163 AML_RESOURCE_MAX_SERIALBUSTYPE) { 164 conversion_table = NULL; 165 } else { 166 /* This is an I2C, SPI, UART or CSI2 serial_bus descriptor */ 167 168 conversion_table = 169 acpi_gbl_convert_resource_serial_bus_dispatch 170 [resource->data.common_serial_bus.type]; 171 } 172 } else { 173 conversion_table = 174 acpi_gbl_set_resource_dispatch[resource->type]; 175 } 176 177 if (!conversion_table) { 178 ACPI_ERROR((AE_INFO, 179 "Invalid/unsupported resource descriptor: Type 0x%2.2X", 180 resource->type)); 181 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); 182 } 183 184 status = acpi_rs_convert_resource_to_aml(resource, 185 ACPI_CAST_PTR(union 186 aml_resource, 187 aml), 188 conversion_table); 189 if (ACPI_FAILURE(status)) { 190 ACPI_EXCEPTION((AE_INFO, status, 191 "Could not convert resource (type 0x%X) to AML", 192 resource->type)); 193 return_ACPI_STATUS(status); 194 } 195 196 /* Perform final sanity check on the new AML resource descriptor */ 197 198 status = 199 acpi_ut_validate_resource(NULL, 200 ACPI_CAST_PTR(union aml_resource, 201 aml), NULL); 202 if (ACPI_FAILURE(status)) { 203 return_ACPI_STATUS(status); 204 } 205 206 /* Check for end-of-list, normal exit */ 207 208 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) { 209 210 /* An End Tag indicates the end of the input Resource Template */ 211 212 return_ACPI_STATUS(AE_OK); 213 } 214 215 /* 216 * Extract the total length of the new descriptor and set the 217 * Aml to point to the next (output) resource descriptor 218 */ 219 aml += acpi_ut_get_descriptor_length(aml); 220 221 /* Point to the next input resource descriptor */ 222 223 resource = ACPI_NEXT_RESOURCE(resource); 224 } 225 226 /* Completed buffer, but did not find an end_tag resource descriptor */ 227 228 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); 229 } 230