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1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
2 /******************************************************************************
3  *
4  * Module Name: exregion - ACPI default op_region (address space) handlers
5  *
6  * Copyright (C) 2000 - 2021, Intel Corp.
7  *
8  *****************************************************************************/
9 
10 #include <acpi/acpi.h>
11 #include "accommon.h"
12 #include "acinterp.h"
13 
14 #define _COMPONENT          ACPI_EXECUTER
15 ACPI_MODULE_NAME("exregion")
16 
17 /*******************************************************************************
18  *
19  * FUNCTION:    acpi_ex_system_memory_space_handler
20  *
21  * PARAMETERS:  function            - Read or Write operation
22  *              address             - Where in the space to read or write
23  *              bit_width           - Field width in bits (8, 16, or 32)
24  *              value               - Pointer to in or out value
25  *              handler_context     - Pointer to Handler's context
26  *              region_context      - Pointer to context specific to the
27  *                                    accessed region
28  *
29  * RETURN:      Status
30  *
31  * DESCRIPTION: Handler for the System Memory address space (Op Region)
32  *
33  ******************************************************************************/
34 acpi_status
acpi_ex_system_memory_space_handler(u32 function,acpi_physical_address address,u32 bit_width,u64 * value,void * handler_context,void * region_context)35 acpi_ex_system_memory_space_handler(u32 function,
36 				    acpi_physical_address address,
37 				    u32 bit_width,
38 				    u64 *value,
39 				    void *handler_context, void *region_context)
40 {
41 	acpi_status status = AE_OK;
42 	void *logical_addr_ptr = NULL;
43 	struct acpi_mem_space_context *mem_info = region_context;
44 	struct acpi_mem_mapping *mm = mem_info->cur_mm;
45 	u32 length;
46 	acpi_size map_length;
47 	acpi_size page_boundary_map_length;
48 #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
49 	u32 remainder;
50 #endif
51 
52 	ACPI_FUNCTION_TRACE(ex_system_memory_space_handler);
53 
54 	/* Validate and translate the bit width */
55 
56 	switch (bit_width) {
57 	case 8:
58 
59 		length = 1;
60 		break;
61 
62 	case 16:
63 
64 		length = 2;
65 		break;
66 
67 	case 32:
68 
69 		length = 4;
70 		break;
71 
72 	case 64:
73 
74 		length = 8;
75 		break;
76 
77 	default:
78 
79 		ACPI_ERROR((AE_INFO, "Invalid SystemMemory width %u",
80 			    bit_width));
81 		return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
82 	}
83 
84 #ifdef ACPI_MISALIGNMENT_NOT_SUPPORTED
85 	/*
86 	 * Hardware does not support non-aligned data transfers, we must verify
87 	 * the request.
88 	 */
89 	(void)acpi_ut_short_divide((u64) address, length, NULL, &remainder);
90 	if (remainder != 0) {
91 		return_ACPI_STATUS(AE_AML_ALIGNMENT);
92 	}
93 #endif
94 
95 	/*
96 	 * Does the request fit into the cached memory mapping?
97 	 * Is 1) Address below the current mapping? OR
98 	 *    2) Address beyond the current mapping?
99 	 */
100 	if (!mm || (address < mm->physical_address) ||
101 	    ((u64) address + length > (u64) mm->physical_address + mm->length)) {
102 		/*
103 		 * The request cannot be resolved by the current memory mapping.
104 		 *
105 		 * Look for an existing saved mapping covering the address range
106 		 * at hand.  If found, save it as the current one and carry out
107 		 * the access.
108 		 */
109 		for (mm = mem_info->first_mm; mm; mm = mm->next_mm) {
110 			if (mm == mem_info->cur_mm)
111 				continue;
112 
113 			if (address < mm->physical_address)
114 				continue;
115 
116 			if ((u64) address + length >
117 					(u64) mm->physical_address + mm->length)
118 				continue;
119 
120 			mem_info->cur_mm = mm;
121 			goto access;
122 		}
123 
124 		/* Create a new mappings list entry */
125 		mm = ACPI_ALLOCATE_ZEROED(sizeof(*mm));
126 		if (!mm) {
127 			ACPI_ERROR((AE_INFO,
128 				    "Unable to save memory mapping at 0x%8.8X%8.8X, size %u",
129 				    ACPI_FORMAT_UINT64(address), length));
130 			return_ACPI_STATUS(AE_NO_MEMORY);
131 		}
132 
133 		/*
134 		 * October 2009: Attempt to map from the requested address to the
135 		 * end of the region. However, we will never map more than one
136 		 * page, nor will we cross a page boundary.
137 		 */
138 		map_length = (acpi_size)
139 		    ((mem_info->address + mem_info->length) - address);
140 
141 		/*
142 		 * If mapping the entire remaining portion of the region will cross
143 		 * a page boundary, just map up to the page boundary, do not cross.
144 		 * On some systems, crossing a page boundary while mapping regions
145 		 * can cause warnings if the pages have different attributes
146 		 * due to resource management.
147 		 *
148 		 * This has the added benefit of constraining a single mapping to
149 		 * one page, which is similar to the original code that used a 4k
150 		 * maximum window.
151 		 */
152 		page_boundary_map_length = (acpi_size)
153 		    (ACPI_ROUND_UP(address, ACPI_DEFAULT_PAGE_SIZE) - address);
154 		if (page_boundary_map_length == 0) {
155 			page_boundary_map_length = ACPI_DEFAULT_PAGE_SIZE;
156 		}
157 
158 		if (map_length > page_boundary_map_length) {
159 			map_length = page_boundary_map_length;
160 		}
161 
162 		/* Create a new mapping starting at the address given */
163 
164 		logical_addr_ptr = acpi_os_map_memory(address, map_length);
165 		if (!logical_addr_ptr) {
166 			ACPI_ERROR((AE_INFO,
167 				    "Could not map memory at 0x%8.8X%8.8X, size %u",
168 				    ACPI_FORMAT_UINT64(address),
169 				    (u32)map_length));
170 			ACPI_FREE(mm);
171 			return_ACPI_STATUS(AE_NO_MEMORY);
172 		}
173 
174 		/* Save the physical address and mapping size */
175 
176 		mm->logical_address = logical_addr_ptr;
177 		mm->physical_address = address;
178 		mm->length = map_length;
179 
180 		/*
181 		 * Add the new entry to the mappigs list and save it as the
182 		 * current mapping.
183 		 */
184 		mm->next_mm = mem_info->first_mm;
185 		mem_info->first_mm = mm;
186 
187 		mem_info->cur_mm = mm;
188 	}
189 
190 access:
191 	/*
192 	 * Generate a logical pointer corresponding to the address we want to
193 	 * access
194 	 */
195 	logical_addr_ptr = mm->logical_address +
196 		((u64) address - (u64) mm->physical_address);
197 
198 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
199 			  "System-Memory (width %u) R/W %u Address=%8.8X%8.8X\n",
200 			  bit_width, function, ACPI_FORMAT_UINT64(address)));
201 
202 	/*
203 	 * Perform the memory read or write
204 	 *
205 	 * Note: For machines that do not support non-aligned transfers, the target
206 	 * address was checked for alignment above. We do not attempt to break the
207 	 * transfer up into smaller (byte-size) chunks because the AML specifically
208 	 * asked for a transfer width that the hardware may require.
209 	 */
210 	switch (function) {
211 	case ACPI_READ:
212 
213 		*value = 0;
214 		switch (bit_width) {
215 		case 8:
216 
217 			*value = (u64)ACPI_GET8(logical_addr_ptr);
218 			break;
219 
220 		case 16:
221 
222 			*value = (u64)ACPI_GET16(logical_addr_ptr);
223 			break;
224 
225 		case 32:
226 
227 			*value = (u64)ACPI_GET32(logical_addr_ptr);
228 			break;
229 
230 		case 64:
231 
232 			*value = (u64)ACPI_GET64(logical_addr_ptr);
233 			break;
234 
235 		default:
236 
237 			/* bit_width was already validated */
238 
239 			break;
240 		}
241 		break;
242 
243 	case ACPI_WRITE:
244 
245 		switch (bit_width) {
246 		case 8:
247 
248 			ACPI_SET8(logical_addr_ptr, *value);
249 			break;
250 
251 		case 16:
252 
253 			ACPI_SET16(logical_addr_ptr, *value);
254 			break;
255 
256 		case 32:
257 
258 			ACPI_SET32(logical_addr_ptr, *value);
259 			break;
260 
261 		case 64:
262 
263 			ACPI_SET64(logical_addr_ptr, *value);
264 			break;
265 
266 		default:
267 
268 			/* bit_width was already validated */
269 
270 			break;
271 		}
272 		break;
273 
274 	default:
275 
276 		status = AE_BAD_PARAMETER;
277 		break;
278 	}
279 
280 	return_ACPI_STATUS(status);
281 }
282 
283 /*******************************************************************************
284  *
285  * FUNCTION:    acpi_ex_system_io_space_handler
286  *
287  * PARAMETERS:  function            - Read or Write operation
288  *              address             - Where in the space to read or write
289  *              bit_width           - Field width in bits (8, 16, or 32)
290  *              value               - Pointer to in or out value
291  *              handler_context     - Pointer to Handler's context
292  *              region_context      - Pointer to context specific to the
293  *                                    accessed region
294  *
295  * RETURN:      Status
296  *
297  * DESCRIPTION: Handler for the System IO address space (Op Region)
298  *
299  ******************************************************************************/
300 
301 acpi_status
acpi_ex_system_io_space_handler(u32 function,acpi_physical_address address,u32 bit_width,u64 * value,void * handler_context,void * region_context)302 acpi_ex_system_io_space_handler(u32 function,
303 				acpi_physical_address address,
304 				u32 bit_width,
305 				u64 *value,
306 				void *handler_context, void *region_context)
307 {
308 	acpi_status status = AE_OK;
309 	u32 value32;
310 
311 	ACPI_FUNCTION_TRACE(ex_system_io_space_handler);
312 
313 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
314 			  "System-IO (width %u) R/W %u Address=%8.8X%8.8X\n",
315 			  bit_width, function, ACPI_FORMAT_UINT64(address)));
316 
317 	/* Decode the function parameter */
318 
319 	switch (function) {
320 	case ACPI_READ:
321 
322 		status = acpi_hw_read_port((acpi_io_address)address,
323 					   &value32, bit_width);
324 		*value = value32;
325 		break;
326 
327 	case ACPI_WRITE:
328 
329 		status = acpi_hw_write_port((acpi_io_address)address,
330 					    (u32)*value, bit_width);
331 		break;
332 
333 	default:
334 
335 		status = AE_BAD_PARAMETER;
336 		break;
337 	}
338 
339 	return_ACPI_STATUS(status);
340 }
341 
342 #ifdef ACPI_PCI_CONFIGURED
343 /*******************************************************************************
344  *
345  * FUNCTION:    acpi_ex_pci_config_space_handler
346  *
347  * PARAMETERS:  function            - Read or Write operation
348  *              address             - Where in the space to read or write
349  *              bit_width           - Field width in bits (8, 16, or 32)
350  *              value               - Pointer to in or out value
351  *              handler_context     - Pointer to Handler's context
352  *              region_context      - Pointer to context specific to the
353  *                                    accessed region
354  *
355  * RETURN:      Status
356  *
357  * DESCRIPTION: Handler for the PCI Config address space (Op Region)
358  *
359  ******************************************************************************/
360 
361 acpi_status
acpi_ex_pci_config_space_handler(u32 function,acpi_physical_address address,u32 bit_width,u64 * value,void * handler_context,void * region_context)362 acpi_ex_pci_config_space_handler(u32 function,
363 				 acpi_physical_address address,
364 				 u32 bit_width,
365 				 u64 *value,
366 				 void *handler_context, void *region_context)
367 {
368 	acpi_status status = AE_OK;
369 	struct acpi_pci_id *pci_id;
370 	u16 pci_register;
371 
372 	ACPI_FUNCTION_TRACE(ex_pci_config_space_handler);
373 
374 	/*
375 	 *  The arguments to acpi_os(Read|Write)pci_configuration are:
376 	 *
377 	 *  pci_segment is the PCI bus segment range 0-31
378 	 *  pci_bus     is the PCI bus number range 0-255
379 	 *  pci_device  is the PCI device number range 0-31
380 	 *  pci_function is the PCI device function number
381 	 *  pci_register is the Config space register range 0-255 bytes
382 	 *
383 	 *  value - input value for write, output address for read
384 	 *
385 	 */
386 	pci_id = (struct acpi_pci_id *)region_context;
387 	pci_register = (u16) (u32) address;
388 
389 	ACPI_DEBUG_PRINT((ACPI_DB_INFO,
390 			  "Pci-Config %u (%u) Seg(%04x) Bus(%04x) "
391 			  "Dev(%04x) Func(%04x) Reg(%04x)\n",
392 			  function, bit_width, pci_id->segment, pci_id->bus,
393 			  pci_id->device, pci_id->function, pci_register));
394 
395 	switch (function) {
396 	case ACPI_READ:
397 
398 		*value = 0;
399 		status =
400 		    acpi_os_read_pci_configuration(pci_id, pci_register, value,
401 						   bit_width);
402 		break;
403 
404 	case ACPI_WRITE:
405 
406 		status =
407 		    acpi_os_write_pci_configuration(pci_id, pci_register,
408 						    *value, bit_width);
409 		break;
410 
411 	default:
412 
413 		status = AE_BAD_PARAMETER;
414 		break;
415 	}
416 
417 	return_ACPI_STATUS(status);
418 }
419 #endif
420 
421 /*******************************************************************************
422  *
423  * FUNCTION:    acpi_ex_cmos_space_handler
424  *
425  * PARAMETERS:  function            - Read or Write operation
426  *              address             - Where in the space to read or write
427  *              bit_width           - Field width in bits (8, 16, or 32)
428  *              value               - Pointer to in or out value
429  *              handler_context     - Pointer to Handler's context
430  *              region_context      - Pointer to context specific to the
431  *                                    accessed region
432  *
433  * RETURN:      Status
434  *
435  * DESCRIPTION: Handler for the CMOS address space (Op Region)
436  *
437  ******************************************************************************/
438 
439 acpi_status
acpi_ex_cmos_space_handler(u32 function,acpi_physical_address address,u32 bit_width,u64 * value,void * handler_context,void * region_context)440 acpi_ex_cmos_space_handler(u32 function,
441 			   acpi_physical_address address,
442 			   u32 bit_width,
443 			   u64 *value,
444 			   void *handler_context, void *region_context)
445 {
446 	acpi_status status = AE_OK;
447 
448 	ACPI_FUNCTION_TRACE(ex_cmos_space_handler);
449 
450 	return_ACPI_STATUS(status);
451 }
452 
453 #ifdef ACPI_PCI_CONFIGURED
454 /*******************************************************************************
455  *
456  * FUNCTION:    acpi_ex_pci_bar_space_handler
457  *
458  * PARAMETERS:  function            - Read or Write operation
459  *              address             - Where in the space to read or write
460  *              bit_width           - Field width in bits (8, 16, or 32)
461  *              value               - Pointer to in or out value
462  *              handler_context     - Pointer to Handler's context
463  *              region_context      - Pointer to context specific to the
464  *                                    accessed region
465  *
466  * RETURN:      Status
467  *
468  * DESCRIPTION: Handler for the PCI bar_target address space (Op Region)
469  *
470  ******************************************************************************/
471 
472 acpi_status
acpi_ex_pci_bar_space_handler(u32 function,acpi_physical_address address,u32 bit_width,u64 * value,void * handler_context,void * region_context)473 acpi_ex_pci_bar_space_handler(u32 function,
474 			      acpi_physical_address address,
475 			      u32 bit_width,
476 			      u64 *value,
477 			      void *handler_context, void *region_context)
478 {
479 	acpi_status status = AE_OK;
480 
481 	ACPI_FUNCTION_TRACE(ex_pci_bar_space_handler);
482 
483 	return_ACPI_STATUS(status);
484 }
485 #endif
486 
487 /*******************************************************************************
488  *
489  * FUNCTION:    acpi_ex_data_table_space_handler
490  *
491  * PARAMETERS:  function            - Read or Write operation
492  *              address             - Where in the space to read or write
493  *              bit_width           - Field width in bits (8, 16, or 32)
494  *              value               - Pointer to in or out value
495  *              handler_context     - Pointer to Handler's context
496  *              region_context      - Pointer to context specific to the
497  *                                    accessed region
498  *
499  * RETURN:      Status
500  *
501  * DESCRIPTION: Handler for the Data Table address space (Op Region)
502  *
503  ******************************************************************************/
504 
505 acpi_status
acpi_ex_data_table_space_handler(u32 function,acpi_physical_address address,u32 bit_width,u64 * value,void * handler_context,void * region_context)506 acpi_ex_data_table_space_handler(u32 function,
507 				 acpi_physical_address address,
508 				 u32 bit_width,
509 				 u64 *value,
510 				 void *handler_context, void *region_context)
511 {
512 	ACPI_FUNCTION_TRACE(ex_data_table_space_handler);
513 
514 	/*
515 	 * Perform the memory read or write. The bit_width was already
516 	 * validated.
517 	 */
518 	switch (function) {
519 	case ACPI_READ:
520 
521 		memcpy(ACPI_CAST_PTR(char, value),
522 		       ACPI_PHYSADDR_TO_PTR(address), ACPI_DIV_8(bit_width));
523 		break;
524 
525 	case ACPI_WRITE:
526 
527 		memcpy(ACPI_PHYSADDR_TO_PTR(address),
528 		       ACPI_CAST_PTR(char, value), ACPI_DIV_8(bit_width));
529 		break;
530 
531 	default:
532 
533 		return_ACPI_STATUS(AE_BAD_PARAMETER);
534 	}
535 
536 	return_ACPI_STATUS(AE_OK);
537 }
538