1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
4 */
5
6 #include <common.h>
7 #include <command.h>
8 #include <errno.h>
9 #include <malloc.h>
10 #include <qfw.h>
11 #include <asm/io.h>
12 #ifdef CONFIG_GENERATE_ACPI_TABLE
13 #include <asm/tables.h>
14 #endif
15 #include <linux/list.h>
16
17 static bool fwcfg_present;
18 static bool fwcfg_dma_present;
19 static struct fw_cfg_arch_ops *fwcfg_arch_ops;
20
21 static LIST_HEAD(fw_list);
22
23 #ifdef CONFIG_GENERATE_ACPI_TABLE
24 /*
25 * This function allocates memory for ACPI tables
26 *
27 * @entry : BIOS linker command entry which tells where to allocate memory
28 * (either high memory or low memory)
29 * @addr : The address that should be used for low memory allcation. If the
30 * memory allocation request is 'ZONE_HIGH' then this parameter will
31 * be ignored.
32 * @return: 0 on success, or negative value on failure
33 */
bios_linker_allocate(struct bios_linker_entry * entry,ulong * addr)34 static int bios_linker_allocate(struct bios_linker_entry *entry, ulong *addr)
35 {
36 uint32_t size, align;
37 struct fw_file *file;
38 unsigned long aligned_addr;
39
40 align = le32_to_cpu(entry->alloc.align);
41 /* align must be power of 2 */
42 if (align & (align - 1)) {
43 printf("error: wrong alignment %u\n", align);
44 return -EINVAL;
45 }
46
47 file = qemu_fwcfg_find_file(entry->alloc.file);
48 if (!file) {
49 printf("error: can't find file %s\n", entry->alloc.file);
50 return -ENOENT;
51 }
52
53 size = be32_to_cpu(file->cfg.size);
54
55 /*
56 * ZONE_HIGH means we need to allocate from high memory, since
57 * malloc space is already at the end of RAM, so we directly use it.
58 * If allocation zone is ZONE_FSEG, then we use the 'addr' passed
59 * in which is low memory
60 */
61 if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH) {
62 aligned_addr = (unsigned long)memalign(align, size);
63 if (!aligned_addr) {
64 printf("error: allocating resource\n");
65 return -ENOMEM;
66 }
67 } else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) {
68 aligned_addr = ALIGN(*addr, align);
69 } else {
70 printf("error: invalid allocation zone\n");
71 return -EINVAL;
72 }
73
74 debug("bios_linker_allocate: allocate file %s, size %u, zone %d, align %u, addr 0x%lx\n",
75 file->cfg.name, size, entry->alloc.zone, align, aligned_addr);
76
77 qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
78 size, (void *)aligned_addr);
79 file->addr = aligned_addr;
80
81 /* adjust address for low memory allocation */
82 if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG)
83 *addr = (aligned_addr + size);
84
85 return 0;
86 }
87
88 /*
89 * This function patches ACPI tables previously loaded
90 * by bios_linker_allocate()
91 *
92 * @entry : BIOS linker command entry which tells how to patch
93 * ACPI tables
94 * @return: 0 on success, or negative value on failure
95 */
bios_linker_add_pointer(struct bios_linker_entry * entry)96 static int bios_linker_add_pointer(struct bios_linker_entry *entry)
97 {
98 struct fw_file *dest, *src;
99 uint32_t offset = le32_to_cpu(entry->pointer.offset);
100 uint64_t pointer = 0;
101
102 dest = qemu_fwcfg_find_file(entry->pointer.dest_file);
103 if (!dest || !dest->addr)
104 return -ENOENT;
105 src = qemu_fwcfg_find_file(entry->pointer.src_file);
106 if (!src || !src->addr)
107 return -ENOENT;
108
109 debug("bios_linker_add_pointer: dest->addr 0x%lx, src->addr 0x%lx, offset 0x%x size %u, 0x%llx\n",
110 dest->addr, src->addr, offset, entry->pointer.size, pointer);
111
112 memcpy(&pointer, (char *)dest->addr + offset, entry->pointer.size);
113 pointer = le64_to_cpu(pointer);
114 pointer += (unsigned long)src->addr;
115 pointer = cpu_to_le64(pointer);
116 memcpy((char *)dest->addr + offset, &pointer, entry->pointer.size);
117
118 return 0;
119 }
120
121 /*
122 * This function updates checksum fields of ACPI tables previously loaded
123 * by bios_linker_allocate()
124 *
125 * @entry : BIOS linker command entry which tells where to update ACPI table
126 * checksums
127 * @return: 0 on success, or negative value on failure
128 */
bios_linker_add_checksum(struct bios_linker_entry * entry)129 static int bios_linker_add_checksum(struct bios_linker_entry *entry)
130 {
131 struct fw_file *file;
132 uint8_t *data, cksum = 0;
133 uint8_t *cksum_start;
134
135 file = qemu_fwcfg_find_file(entry->cksum.file);
136 if (!file || !file->addr)
137 return -ENOENT;
138
139 data = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.offset));
140 cksum_start = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.start));
141 cksum = table_compute_checksum(cksum_start,
142 le32_to_cpu(entry->cksum.length));
143 *data = cksum;
144
145 return 0;
146 }
147
148 /* This function loads and patches ACPI tables provided by QEMU */
write_acpi_tables(ulong addr)149 ulong write_acpi_tables(ulong addr)
150 {
151 int i, ret = 0;
152 struct fw_file *file;
153 struct bios_linker_entry *table_loader;
154 struct bios_linker_entry *entry;
155 uint32_t size;
156
157 /* make sure fw_list is loaded */
158 ret = qemu_fwcfg_read_firmware_list();
159 if (ret) {
160 printf("error: can't read firmware file list\n");
161 return addr;
162 }
163
164 file = qemu_fwcfg_find_file("etc/table-loader");
165 if (!file) {
166 printf("error: can't find etc/table-loader\n");
167 return addr;
168 }
169
170 size = be32_to_cpu(file->cfg.size);
171 if ((size % sizeof(*entry)) != 0) {
172 printf("error: table-loader maybe corrupted\n");
173 return addr;
174 }
175
176 table_loader = malloc(size);
177 if (!table_loader) {
178 printf("error: no memory for table-loader\n");
179 return addr;
180 }
181
182 qemu_fwcfg_read_entry(be16_to_cpu(file->cfg.select),
183 size, table_loader);
184
185 for (i = 0; i < (size / sizeof(*entry)); i++) {
186 entry = table_loader + i;
187 switch (le32_to_cpu(entry->command)) {
188 case BIOS_LINKER_LOADER_COMMAND_ALLOCATE:
189 ret = bios_linker_allocate(entry, &addr);
190 if (ret)
191 goto out;
192 break;
193 case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER:
194 ret = bios_linker_add_pointer(entry);
195 if (ret)
196 goto out;
197 break;
198 case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM:
199 ret = bios_linker_add_checksum(entry);
200 if (ret)
201 goto out;
202 break;
203 default:
204 break;
205 }
206 }
207
208 out:
209 if (ret) {
210 struct fw_cfg_file_iter iter;
211 for (file = qemu_fwcfg_file_iter_init(&iter);
212 !qemu_fwcfg_file_iter_end(&iter);
213 file = qemu_fwcfg_file_iter_next(&iter)) {
214 if (file->addr) {
215 free((void *)file->addr);
216 file->addr = 0;
217 }
218 }
219 }
220
221 free(table_loader);
222 return addr;
223 }
224
acpi_get_rsdp_addr(void)225 ulong acpi_get_rsdp_addr(void)
226 {
227 struct fw_file *file;
228
229 file = qemu_fwcfg_find_file("etc/acpi/rsdp");
230 return file->addr;
231 }
232 #endif
233
234 /* Read configuration item using fw_cfg PIO interface */
qemu_fwcfg_read_entry_pio(uint16_t entry,uint32_t size,void * address)235 static void qemu_fwcfg_read_entry_pio(uint16_t entry,
236 uint32_t size, void *address)
237 {
238 debug("qemu_fwcfg_read_entry_pio: entry 0x%x, size %u address %p\n",
239 entry, size, address);
240
241 return fwcfg_arch_ops->arch_read_pio(entry, size, address);
242 }
243
244 /* Read configuration item using fw_cfg DMA interface */
qemu_fwcfg_read_entry_dma(uint16_t entry,uint32_t size,void * address)245 static void qemu_fwcfg_read_entry_dma(uint16_t entry,
246 uint32_t size, void *address)
247 {
248 struct fw_cfg_dma_access dma;
249
250 dma.length = cpu_to_be32(size);
251 dma.address = cpu_to_be64((uintptr_t)address);
252 dma.control = cpu_to_be32(FW_CFG_DMA_READ);
253
254 /*
255 * writting FW_CFG_INVALID will cause read operation to resume at
256 * last offset, otherwise read will start at offset 0
257 */
258 if (entry != FW_CFG_INVALID)
259 dma.control |= cpu_to_be32(FW_CFG_DMA_SELECT | (entry << 16));
260
261 barrier();
262
263 debug("qemu_fwcfg_read_entry_dma: entry 0x%x, size %u address %p, control 0x%x\n",
264 entry, size, address, be32_to_cpu(dma.control));
265
266 fwcfg_arch_ops->arch_read_dma(&dma);
267 }
268
qemu_fwcfg_present(void)269 bool qemu_fwcfg_present(void)
270 {
271 return fwcfg_present;
272 }
273
qemu_fwcfg_dma_present(void)274 bool qemu_fwcfg_dma_present(void)
275 {
276 return fwcfg_dma_present;
277 }
278
qemu_fwcfg_read_entry(uint16_t entry,uint32_t length,void * address)279 void qemu_fwcfg_read_entry(uint16_t entry, uint32_t length, void *address)
280 {
281 if (fwcfg_dma_present)
282 qemu_fwcfg_read_entry_dma(entry, length, address);
283 else
284 qemu_fwcfg_read_entry_pio(entry, length, address);
285 }
286
qemu_fwcfg_online_cpus(void)287 int qemu_fwcfg_online_cpus(void)
288 {
289 uint16_t nb_cpus;
290
291 if (!fwcfg_present)
292 return -ENODEV;
293
294 qemu_fwcfg_read_entry(FW_CFG_NB_CPUS, 2, &nb_cpus);
295
296 return le16_to_cpu(nb_cpus);
297 }
298
qemu_fwcfg_read_firmware_list(void)299 int qemu_fwcfg_read_firmware_list(void)
300 {
301 int i;
302 uint32_t count;
303 struct fw_file *file;
304 struct list_head *entry;
305
306 /* don't read it twice */
307 if (!list_empty(&fw_list))
308 return 0;
309
310 qemu_fwcfg_read_entry(FW_CFG_FILE_DIR, 4, &count);
311 if (!count)
312 return 0;
313
314 count = be32_to_cpu(count);
315 for (i = 0; i < count; i++) {
316 file = malloc(sizeof(*file));
317 if (!file) {
318 printf("error: allocating resource\n");
319 goto err;
320 }
321 qemu_fwcfg_read_entry(FW_CFG_INVALID,
322 sizeof(struct fw_cfg_file), &file->cfg);
323 file->addr = 0;
324 list_add_tail(&file->list, &fw_list);
325 }
326
327 return 0;
328
329 err:
330 list_for_each(entry, &fw_list) {
331 file = list_entry(entry, struct fw_file, list);
332 free(file);
333 }
334
335 return -ENOMEM;
336 }
337
qemu_fwcfg_find_file(const char * name)338 struct fw_file *qemu_fwcfg_find_file(const char *name)
339 {
340 struct list_head *entry;
341 struct fw_file *file;
342
343 list_for_each(entry, &fw_list) {
344 file = list_entry(entry, struct fw_file, list);
345 if (!strcmp(file->cfg.name, name))
346 return file;
347 }
348
349 return NULL;
350 }
351
qemu_fwcfg_file_iter_init(struct fw_cfg_file_iter * iter)352 struct fw_file *qemu_fwcfg_file_iter_init(struct fw_cfg_file_iter *iter)
353 {
354 iter->entry = fw_list.next;
355 return list_entry((struct list_head *)iter->entry,
356 struct fw_file, list);
357 }
358
qemu_fwcfg_file_iter_next(struct fw_cfg_file_iter * iter)359 struct fw_file *qemu_fwcfg_file_iter_next(struct fw_cfg_file_iter *iter)
360 {
361 iter->entry = ((struct list_head *)iter->entry)->next;
362 return list_entry((struct list_head *)iter->entry,
363 struct fw_file, list);
364 }
365
qemu_fwcfg_file_iter_end(struct fw_cfg_file_iter * iter)366 bool qemu_fwcfg_file_iter_end(struct fw_cfg_file_iter *iter)
367 {
368 return iter->entry == &fw_list;
369 }
370
qemu_fwcfg_init(struct fw_cfg_arch_ops * ops)371 void qemu_fwcfg_init(struct fw_cfg_arch_ops *ops)
372 {
373 uint32_t qemu;
374 uint32_t dma_enabled;
375
376 fwcfg_present = false;
377 fwcfg_dma_present = false;
378 fwcfg_arch_ops = NULL;
379
380 if (!ops || !ops->arch_read_pio || !ops->arch_read_dma)
381 return;
382 fwcfg_arch_ops = ops;
383
384 qemu_fwcfg_read_entry_pio(FW_CFG_SIGNATURE, 4, &qemu);
385 if (be32_to_cpu(qemu) == QEMU_FW_CFG_SIGNATURE)
386 fwcfg_present = true;
387
388 if (fwcfg_present) {
389 qemu_fwcfg_read_entry_pio(FW_CFG_ID, 1, &dma_enabled);
390 if (dma_enabled & FW_CFG_DMA_ENABLED)
391 fwcfg_dma_present = true;
392 }
393 }
394