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, or UART 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 ACPI_DEBUG_PRINT((ACPI_DB_RESOURCES, 93 "Type %.2X, AmlLength %.2X InternalLength %.2X\n", 94 acpi_ut_get_resource_type(aml), length, 95 resource->length)); 96 97 /* Point to the next structure in the output buffer */ 98 99 *resource_ptr = ACPI_NEXT_RESOURCE(resource); 100 return_ACPI_STATUS(AE_OK); 101 } 102 103 /******************************************************************************* 104 * 105 * FUNCTION: acpi_rs_convert_resources_to_aml 106 * 107 * PARAMETERS: resource - Pointer to the resource linked list 108 * aml_size_needed - Calculated size of the byte stream 109 * needed from calling acpi_rs_get_aml_length() 110 * The size of the output_buffer is 111 * guaranteed to be >= aml_size_needed 112 * output_buffer - Pointer to the buffer that will 113 * contain the byte stream 114 * 115 * RETURN: Status 116 * 117 * DESCRIPTION: Takes the resource linked list and parses it, creating a 118 * byte stream of resources in the caller's output buffer 119 * 120 ******************************************************************************/ 121 122 acpi_status 123 acpi_rs_convert_resources_to_aml(struct acpi_resource *resource, 124 acpi_size aml_size_needed, u8 * output_buffer) 125 { 126 u8 *aml = output_buffer; 127 u8 *end_aml = output_buffer + aml_size_needed; 128 struct acpi_rsconvert_info *conversion_table; 129 acpi_status status; 130 131 ACPI_FUNCTION_TRACE(rs_convert_resources_to_aml); 132 133 /* Walk the resource descriptor list, convert each descriptor */ 134 135 while (aml < end_aml) { 136 137 /* Validate the (internal) Resource Type */ 138 139 if (resource->type > ACPI_RESOURCE_TYPE_MAX) { 140 ACPI_ERROR((AE_INFO, 141 "Invalid descriptor type (0x%X) in resource list", 142 resource->type)); 143 return_ACPI_STATUS(AE_BAD_DATA); 144 } 145 146 /* Sanity check the length. It must not be zero, or we loop forever */ 147 148 if (!resource->length) { 149 ACPI_ERROR((AE_INFO, 150 "Invalid zero length descriptor in resource list\n")); 151 return_ACPI_STATUS(AE_AML_BAD_RESOURCE_LENGTH); 152 } 153 154 /* Perform the conversion */ 155 156 if (resource->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) { 157 if (resource->data.common_serial_bus.type > 158 AML_RESOURCE_MAX_SERIALBUSTYPE) { 159 conversion_table = NULL; 160 } else { 161 /* This is an I2C, SPI, or UART serial_bus descriptor */ 162 163 conversion_table = 164 acpi_gbl_convert_resource_serial_bus_dispatch 165 [resource->data.common_serial_bus.type]; 166 } 167 } else { 168 conversion_table = 169 acpi_gbl_set_resource_dispatch[resource->type]; 170 } 171 172 if (!conversion_table) { 173 ACPI_ERROR((AE_INFO, 174 "Invalid/unsupported resource descriptor: Type 0x%2.2X", 175 resource->type)); 176 return_ACPI_STATUS(AE_AML_INVALID_RESOURCE_TYPE); 177 } 178 179 status = acpi_rs_convert_resource_to_aml(resource, 180 ACPI_CAST_PTR(union 181 aml_resource, 182 aml), 183 conversion_table); 184 if (ACPI_FAILURE(status)) { 185 ACPI_EXCEPTION((AE_INFO, status, 186 "Could not convert resource (type 0x%X) to AML", 187 resource->type)); 188 return_ACPI_STATUS(status); 189 } 190 191 /* Perform final sanity check on the new AML resource descriptor */ 192 193 status = 194 acpi_ut_validate_resource(NULL, 195 ACPI_CAST_PTR(union aml_resource, 196 aml), NULL); 197 if (ACPI_FAILURE(status)) { 198 return_ACPI_STATUS(status); 199 } 200 201 /* Check for end-of-list, normal exit */ 202 203 if (resource->type == ACPI_RESOURCE_TYPE_END_TAG) { 204 205 /* An End Tag indicates the end of the input Resource Template */ 206 207 return_ACPI_STATUS(AE_OK); 208 } 209 210 /* 211 * Extract the total length of the new descriptor and set the 212 * Aml to point to the next (output) resource descriptor 213 */ 214 aml += acpi_ut_get_descriptor_length(aml); 215 216 /* Point to the next input resource descriptor */ 217 218 resource = ACPI_NEXT_RESOURCE(resource); 219 } 220 221 /* Completed buffer, but did not find an end_tag resource descriptor */ 222 223 return_ACPI_STATUS(AE_AML_NO_RESOURCE_END_TAG); 224 } 225