1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: tbinstal - ACPI table installation and removal 5 * 6 * Copyright (C) 2000 - 2022, Intel Corp. 7 * 8 *****************************************************************************/ 9 10 #include <acpi/acpi.h> 11 #include "accommon.h" 12 #include "actables.h" 13 14 #define _COMPONENT ACPI_TABLES 15 ACPI_MODULE_NAME("tbinstal") 16 17 /******************************************************************************* 18 * 19 * FUNCTION: acpi_tb_install_table_with_override 20 * 21 * PARAMETERS: new_table_desc - New table descriptor to install 22 * override - Whether override should be performed 23 * table_index - Where the table index is returned 24 * 25 * RETURN: None 26 * 27 * DESCRIPTION: Install an ACPI table into the global data structure. The 28 * table override mechanism is called to allow the host 29 * OS to replace any table before it is installed in the root 30 * table array. 31 * 32 ******************************************************************************/ 33 void 34 acpi_tb_install_table_with_override(struct acpi_table_desc *new_table_desc, 35 u8 override, u32 *table_index) 36 { 37 u32 i; 38 acpi_status status; 39 40 status = acpi_tb_get_next_table_descriptor(&i, NULL); 41 if (ACPI_FAILURE(status)) { 42 return; 43 } 44 45 /* 46 * ACPI Table Override: 47 * 48 * Before we install the table, let the host OS override it with a new 49 * one if desired. Any table within the RSDT/XSDT can be replaced, 50 * including the DSDT which is pointed to by the FADT. 51 */ 52 if (override) { 53 acpi_tb_override_table(new_table_desc); 54 } 55 56 acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.tables[i], 57 new_table_desc->address, 58 new_table_desc->flags, 59 new_table_desc->pointer); 60 61 acpi_tb_print_table_header(new_table_desc->address, 62 new_table_desc->pointer); 63 64 /* This synchronizes acpi_gbl_dsdt_index */ 65 66 *table_index = i; 67 68 /* Set the global integer width (based upon revision of the DSDT) */ 69 70 if (i == acpi_gbl_dsdt_index) { 71 acpi_ut_set_integer_width(new_table_desc->pointer->revision); 72 } 73 } 74 75 /******************************************************************************* 76 * 77 * FUNCTION: acpi_tb_install_standard_table 78 * 79 * PARAMETERS: address - Address of the table (might be a virtual 80 * address depending on the table_flags) 81 * flags - Flags for the table 82 * table - Pointer to the table (required for virtual 83 * origins, optional for physical) 84 * reload - Whether reload should be performed 85 * override - Whether override should be performed 86 * table_index - Where the table index is returned 87 * 88 * RETURN: Status 89 * 90 * DESCRIPTION: This function is called to verify and install an ACPI table. 91 * When this function is called by "Load" or "LoadTable" opcodes, 92 * or by acpi_load_table() API, the "Reload" parameter is set. 93 * After successfully returning from this function, table is 94 * "INSTALLED" but not "VALIDATED". 95 * 96 ******************************************************************************/ 97 98 acpi_status 99 acpi_tb_install_standard_table(acpi_physical_address address, 100 u8 flags, 101 struct acpi_table_header *table, 102 u8 reload, u8 override, u32 *table_index) 103 { 104 u32 i; 105 acpi_status status = AE_OK; 106 struct acpi_table_desc new_table_desc; 107 108 ACPI_FUNCTION_TRACE(tb_install_standard_table); 109 110 /* Acquire a temporary table descriptor for validation */ 111 112 status = 113 acpi_tb_acquire_temp_table(&new_table_desc, address, flags, table); 114 if (ACPI_FAILURE(status)) { 115 ACPI_ERROR((AE_INFO, 116 "Could not acquire table length at %8.8X%8.8X", 117 ACPI_FORMAT_UINT64(address))); 118 return_ACPI_STATUS(status); 119 } 120 121 /* 122 * Optionally do not load any SSDTs from the RSDT/XSDT. This can 123 * be useful for debugging ACPI problems on some machines. 124 */ 125 if (!reload && 126 acpi_gbl_disable_ssdt_table_install && 127 ACPI_COMPARE_NAMESEG(&new_table_desc.signature, ACPI_SIG_SSDT)) { 128 ACPI_INFO(("Ignoring installation of %4.4s at %8.8X%8.8X", 129 new_table_desc.signature.ascii, 130 ACPI_FORMAT_UINT64(address))); 131 goto release_and_exit; 132 } 133 134 /* Acquire the table lock */ 135 136 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 137 138 /* Validate and verify a table before installation */ 139 140 status = acpi_tb_verify_temp_table(&new_table_desc, NULL, &i); 141 if (ACPI_FAILURE(status)) { 142 if (status == AE_CTRL_TERMINATE) { 143 /* 144 * Table was unloaded, allow it to be reloaded. 145 * As we are going to return AE_OK to the caller, we should 146 * take the responsibility of freeing the input descriptor. 147 * Refill the input descriptor to ensure 148 * acpi_tb_install_table_with_override() can be called again to 149 * indicate the re-installation. 150 */ 151 acpi_tb_uninstall_table(&new_table_desc); 152 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 153 *table_index = i; 154 return_ACPI_STATUS(AE_OK); 155 } 156 goto unlock_and_exit; 157 } 158 159 /* Add the table to the global root table list */ 160 161 acpi_tb_install_table_with_override(&new_table_desc, override, 162 table_index); 163 164 /* Invoke table handler */ 165 166 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 167 acpi_tb_notify_table(ACPI_TABLE_EVENT_INSTALL, new_table_desc.pointer); 168 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 169 170 unlock_and_exit: 171 172 /* Release the table lock */ 173 174 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 175 176 release_and_exit: 177 178 /* Release the temporary table descriptor */ 179 180 acpi_tb_release_temp_table(&new_table_desc); 181 return_ACPI_STATUS(status); 182 } 183 184 /******************************************************************************* 185 * 186 * FUNCTION: acpi_tb_override_table 187 * 188 * PARAMETERS: old_table_desc - Validated table descriptor to be 189 * overridden 190 * 191 * RETURN: None 192 * 193 * DESCRIPTION: Attempt table override by calling the OSL override functions. 194 * Note: If the table is overridden, then the entire new table 195 * is acquired and returned by this function. 196 * Before/after invocation, the table descriptor is in a state 197 * that is "VALIDATED". 198 * 199 ******************************************************************************/ 200 201 void acpi_tb_override_table(struct acpi_table_desc *old_table_desc) 202 { 203 acpi_status status; 204 struct acpi_table_desc new_table_desc; 205 struct acpi_table_header *table; 206 acpi_physical_address address; 207 u32 length; 208 ACPI_ERROR_ONLY(char *override_type); 209 210 /* (1) Attempt logical override (returns a logical address) */ 211 212 status = acpi_os_table_override(old_table_desc->pointer, &table); 213 if (ACPI_SUCCESS(status) && table) { 214 acpi_tb_acquire_temp_table(&new_table_desc, 215 ACPI_PTR_TO_PHYSADDR(table), 216 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, 217 table); 218 ACPI_ERROR_ONLY(override_type = "Logical"); 219 goto finish_override; 220 } 221 222 /* (2) Attempt physical override (returns a physical address) */ 223 224 status = acpi_os_physical_table_override(old_table_desc->pointer, 225 &address, &length); 226 if (ACPI_SUCCESS(status) && address && length) { 227 acpi_tb_acquire_temp_table(&new_table_desc, address, 228 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, 229 NULL); 230 ACPI_ERROR_ONLY(override_type = "Physical"); 231 goto finish_override; 232 } 233 234 return; /* There was no override */ 235 236 finish_override: 237 238 /* 239 * Validate and verify a table before overriding, no nested table 240 * duplication check as it's too complicated and unnecessary. 241 */ 242 status = acpi_tb_verify_temp_table(&new_table_desc, NULL, NULL); 243 if (ACPI_FAILURE(status)) { 244 return; 245 } 246 247 ACPI_INFO(("%4.4s 0x%8.8X%8.8X" 248 " %s table override, new table: 0x%8.8X%8.8X", 249 old_table_desc->signature.ascii, 250 ACPI_FORMAT_UINT64(old_table_desc->address), 251 override_type, ACPI_FORMAT_UINT64(new_table_desc.address))); 252 253 /* We can now uninstall the original table */ 254 255 acpi_tb_uninstall_table(old_table_desc); 256 257 /* 258 * Replace the original table descriptor and keep its state as 259 * "VALIDATED". 260 */ 261 acpi_tb_init_table_descriptor(old_table_desc, new_table_desc.address, 262 new_table_desc.flags, 263 new_table_desc.pointer); 264 acpi_tb_validate_temp_table(old_table_desc); 265 266 /* Release the temporary table descriptor */ 267 268 acpi_tb_release_temp_table(&new_table_desc); 269 } 270 271 /******************************************************************************* 272 * 273 * FUNCTION: acpi_tb_uninstall_table 274 * 275 * PARAMETERS: table_desc - Table descriptor 276 * 277 * RETURN: None 278 * 279 * DESCRIPTION: Delete one internal ACPI table 280 * 281 ******************************************************************************/ 282 283 void acpi_tb_uninstall_table(struct acpi_table_desc *table_desc) 284 { 285 286 ACPI_FUNCTION_TRACE(tb_uninstall_table); 287 288 /* Table must be installed */ 289 290 if (!table_desc->address) { 291 return_VOID; 292 } 293 294 acpi_tb_invalidate_table(table_desc); 295 296 if ((table_desc->flags & ACPI_TABLE_ORIGIN_MASK) == 297 ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL) { 298 ACPI_FREE(table_desc->pointer); 299 table_desc->pointer = NULL; 300 } 301 302 table_desc->address = ACPI_PTR_TO_PHYSADDR(NULL); 303 return_VOID; 304 } 305