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a61127c2 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
31625340 JC |
2 | /* |
3 | * tboot.c: main implementation of helper functions used by kernel for | |
4 | * runtime support of Intel(R) Trusted Execution Technology | |
5 | * | |
6 | * Copyright (c) 2006-2009, Intel Corporation | |
31625340 JC |
7 | */ |
8 | ||
daedaa33 | 9 | #include <linux/intel-iommu.h> |
31625340 JC |
10 | #include <linux/init_task.h> |
11 | #include <linux/spinlock.h> | |
69c60c88 | 12 | #include <linux/export.h> |
69575d38 | 13 | #include <linux/delay.h> |
31625340 JC |
14 | #include <linux/sched.h> |
15 | #include <linux/init.h> | |
16 | #include <linux/dmar.h> | |
69575d38 | 17 | #include <linux/cpu.h> |
31625340 JC |
18 | #include <linux/pfn.h> |
19 | #include <linux/mm.h> | |
69575d38 | 20 | #include <linux/tboot.h> |
13bfd47a | 21 | #include <linux/debugfs.h> |
31625340 | 22 | |
c9b77ccb | 23 | #include <asm/realmode.h> |
31625340 JC |
24 | #include <asm/processor.h> |
25 | #include <asm/bootparam.h> | |
31625340 | 26 | #include <asm/pgalloc.h> |
b7f080cf | 27 | #include <asm/swiotlb.h> |
81e2d7b3 | 28 | #include <asm/fixmap.h> |
58c41d28 | 29 | #include <asm/proto.h> |
31625340 | 30 | #include <asm/setup.h> |
66441bd3 | 31 | #include <asm/e820/api.h> |
31625340 JC |
32 | #include <asm/io.h> |
33 | ||
bf8b88e9 | 34 | #include "../realmode/rm/wakeup.h" |
31625340 JC |
35 | |
36 | /* Global pointer to shared data; NULL means no measured launch. */ | |
767dea21 | 37 | static struct tboot *tboot __read_mostly; |
31625340 JC |
38 | |
39 | /* timeout for APs (in secs) to enter wait-for-SIPI state during shutdown */ | |
40 | #define AP_WAIT_TIMEOUT 1 | |
41 | ||
42 | #undef pr_fmt | |
43 | #define pr_fmt(fmt) "tboot: " fmt | |
44 | ||
45 | static u8 tboot_uuid[16] __initdata = TBOOT_UUID; | |
46 | ||
767dea21 CH |
47 | bool tboot_enabled(void) |
48 | { | |
49 | return tboot != NULL; | |
50 | } | |
51 | ||
cdc34cb8 AB |
52 | /* noinline to prevent gcc from warning about dereferencing constant fixaddr */ |
53 | static noinline __init bool check_tboot_version(void) | |
54 | { | |
55 | if (memcmp(&tboot_uuid, &tboot->uuid, sizeof(tboot->uuid))) { | |
56 | pr_warn("tboot at 0x%llx is invalid\n", boot_params.tboot_addr); | |
57 | return false; | |
58 | } | |
59 | ||
60 | if (tboot->version < 5) { | |
61 | pr_warn("tboot version is invalid: %u\n", tboot->version); | |
62 | return false; | |
63 | } | |
64 | ||
65 | pr_info("found shared page at phys addr 0x%llx:\n", | |
66 | boot_params.tboot_addr); | |
67 | pr_debug("version: %d\n", tboot->version); | |
68 | pr_debug("log_addr: 0x%08x\n", tboot->log_addr); | |
69 | pr_debug("shutdown_entry: 0x%x\n", tboot->shutdown_entry); | |
70 | pr_debug("tboot_base: 0x%08x\n", tboot->tboot_base); | |
71 | pr_debug("tboot_size: 0x%x\n", tboot->tboot_size); | |
72 | ||
73 | return true; | |
74 | } | |
75 | ||
31625340 JC |
76 | void __init tboot_probe(void) |
77 | { | |
78 | /* Look for valid page-aligned address for shared page. */ | |
79 | if (!boot_params.tboot_addr) | |
80 | return; | |
81 | /* | |
82 | * also verify that it is mapped as we expect it before calling | |
83 | * set_fixmap(), to reduce chance of garbage value causing crash | |
84 | */ | |
3bce64f0 | 85 | if (!e820__mapped_any(boot_params.tboot_addr, |
09821ff1 | 86 | boot_params.tboot_addr, E820_TYPE_RESERVED)) { |
8d3bcc44 | 87 | pr_warn("non-0 tboot_addr but it is not of type E820_TYPE_RESERVED\n"); |
31625340 JC |
88 | return; |
89 | } | |
90 | ||
31625340 JC |
91 | /* Map and check for tboot UUID. */ |
92 | set_fixmap(FIX_TBOOT_BASE, boot_params.tboot_addr); | |
cdc34cb8 AB |
93 | tboot = (void *)fix_to_virt(FIX_TBOOT_BASE); |
94 | if (!check_tboot_version()) | |
31625340 | 95 | tboot = NULL; |
31625340 JC |
96 | } |
97 | ||
11520e5e LT |
98 | static pgd_t *tboot_pg_dir; |
99 | static struct mm_struct tboot_mm = { | |
100 | .mm_rb = RB_ROOT, | |
101 | .pgd = swapper_pg_dir, | |
102 | .mm_users = ATOMIC_INIT(2), | |
103 | .mm_count = ATOMIC_INIT(1), | |
57efa1fe | 104 | .write_protect_seq = SEQCNT_ZERO(tboot_mm.write_protect_seq), |
14c3656b | 105 | MMAP_LOCK_INITIALIZER(init_mm) |
11520e5e LT |
106 | .page_table_lock = __SPIN_LOCK_UNLOCKED(init_mm.page_table_lock), |
107 | .mmlist = LIST_HEAD_INIT(init_mm.mmlist), | |
108 | }; | |
109 | ||
31625340 JC |
110 | static inline void switch_to_tboot_pt(void) |
111 | { | |
11520e5e LT |
112 | write_cr3(virt_to_phys(tboot_pg_dir)); |
113 | } | |
114 | ||
115 | static int map_tboot_page(unsigned long vaddr, unsigned long pfn, | |
116 | pgprot_t prot) | |
117 | { | |
118 | pgd_t *pgd; | |
e0c4f675 | 119 | p4d_t *p4d; |
11520e5e LT |
120 | pud_t *pud; |
121 | pmd_t *pmd; | |
122 | pte_t *pte; | |
123 | ||
124 | pgd = pgd_offset(&tboot_mm, vaddr); | |
e0c4f675 KS |
125 | p4d = p4d_alloc(&tboot_mm, pgd, vaddr); |
126 | if (!p4d) | |
127 | return -1; | |
128 | pud = pud_alloc(&tboot_mm, p4d, vaddr); | |
11520e5e LT |
129 | if (!pud) |
130 | return -1; | |
131 | pmd = pmd_alloc(&tboot_mm, pud, vaddr); | |
132 | if (!pmd) | |
133 | return -1; | |
3ed3a4f0 | 134 | pte = pte_alloc_map(&tboot_mm, pmd, vaddr); |
11520e5e LT |
135 | if (!pte) |
136 | return -1; | |
137 | set_pte_at(&tboot_mm, vaddr, pte, pfn_pte(pfn, prot)); | |
138 | pte_unmap(pte); | |
445b69e3 DH |
139 | |
140 | /* | |
141 | * PTI poisons low addresses in the kernel page tables in the | |
142 | * name of making them unusable for userspace. To execute | |
143 | * code at such a low address, the poison must be cleared. | |
144 | * | |
145 | * Note: 'pgd' actually gets set in p4d_alloc() _or_ | |
146 | * pud_alloc() depending on 4/5-level paging. | |
147 | */ | |
148 | pgd->pgd &= ~_PAGE_NX; | |
149 | ||
11520e5e LT |
150 | return 0; |
151 | } | |
152 | ||
153 | static int map_tboot_pages(unsigned long vaddr, unsigned long start_pfn, | |
154 | unsigned long nr) | |
155 | { | |
156 | /* Reuse the original kernel mapping */ | |
157 | tboot_pg_dir = pgd_alloc(&tboot_mm); | |
158 | if (!tboot_pg_dir) | |
159 | return -1; | |
160 | ||
161 | for (; nr > 0; nr--, vaddr += PAGE_SIZE, start_pfn++) { | |
162 | if (map_tboot_page(vaddr, start_pfn, PAGE_KERNEL_EXEC)) | |
163 | return -1; | |
164 | } | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | static void tboot_create_trampoline(void) | |
170 | { | |
171 | u32 map_base, map_size; | |
172 | ||
173 | /* Create identity map for tboot shutdown code. */ | |
174 | map_base = PFN_DOWN(tboot->tboot_base); | |
175 | map_size = PFN_UP(tboot->tboot_size); | |
176 | if (map_tboot_pages(map_base << PAGE_SHIFT, map_base, map_size)) | |
177 | panic("tboot: Error mapping tboot pages (mfns) @ 0x%x, 0x%x\n", | |
178 | map_base, map_size); | |
31625340 JC |
179 | } |
180 | ||
58c41d28 PA |
181 | #ifdef CONFIG_ACPI_SLEEP |
182 | ||
183 | static void add_mac_region(phys_addr_t start, unsigned long size) | |
31625340 | 184 | { |
58c41d28 PA |
185 | struct tboot_mac_region *mr; |
186 | phys_addr_t end = start + size; | |
187 | ||
4bd96a7a SW |
188 | if (tboot->num_mac_regions >= MAX_TB_MAC_REGIONS) |
189 | panic("tboot: Too many MAC regions\n"); | |
190 | ||
58c41d28 PA |
191 | if (start && size) { |
192 | mr = &tboot->mac_regions[tboot->num_mac_regions++]; | |
193 | mr->start = round_down(start, PAGE_SIZE); | |
194 | mr->size = round_up(end, PAGE_SIZE) - mr->start; | |
195 | } | |
196 | } | |
197 | ||
198 | static int tboot_setup_sleep(void) | |
199 | { | |
4bd96a7a SW |
200 | int i; |
201 | ||
58c41d28 PA |
202 | tboot->num_mac_regions = 0; |
203 | ||
bf495573 | 204 | for (i = 0; i < e820_table->nr_entries; i++) { |
09821ff1 IM |
205 | if ((e820_table->entries[i].type != E820_TYPE_RAM) |
206 | && (e820_table->entries[i].type != E820_TYPE_RESERVED_KERN)) | |
4bd96a7a | 207 | continue; |
62a3207b | 208 | |
bf495573 | 209 | add_mac_region(e820_table->entries[i].addr, e820_table->entries[i].size); |
4bd96a7a | 210 | } |
58c41d28 | 211 | |
c9b77ccb | 212 | tboot->acpi_sinfo.kernel_s3_resume_vector = |
b429dbf6 | 213 | real_mode_header->wakeup_start; |
58c41d28 PA |
214 | |
215 | return 0; | |
216 | } | |
217 | ||
218 | #else /* no CONFIG_ACPI_SLEEP */ | |
219 | ||
220 | static int tboot_setup_sleep(void) | |
221 | { | |
222 | /* S3 shutdown requested, but S3 not supported by the kernel... */ | |
223 | BUG(); | |
224 | return -1; | |
31625340 JC |
225 | } |
226 | ||
58c41d28 PA |
227 | #endif |
228 | ||
31625340 JC |
229 | void tboot_shutdown(u32 shutdown_type) |
230 | { | |
231 | void (*shutdown)(void); | |
232 | ||
233 | if (!tboot_enabled()) | |
234 | return; | |
235 | ||
11520e5e LT |
236 | /* |
237 | * if we're being called before the 1:1 mapping is set up then just | |
238 | * return and let the normal shutdown happen; this should only be | |
239 | * due to very early panic() | |
240 | */ | |
241 | if (!tboot_pg_dir) | |
242 | return; | |
243 | ||
31625340 JC |
244 | /* if this is S3 then set regions to MAC */ |
245 | if (shutdown_type == TB_SHUTDOWN_S3) | |
58c41d28 PA |
246 | if (tboot_setup_sleep()) |
247 | return; | |
31625340 JC |
248 | |
249 | tboot->shutdown_type = shutdown_type; | |
250 | ||
251 | switch_to_tboot_pt(); | |
252 | ||
253 | shutdown = (void(*)(void))(unsigned long)tboot->shutdown_entry; | |
254 | shutdown(); | |
255 | ||
256 | /* should not reach here */ | |
257 | while (1) | |
258 | halt(); | |
259 | } | |
260 | ||
261 | static void tboot_copy_fadt(const struct acpi_table_fadt *fadt) | |
262 | { | |
263 | #define TB_COPY_GAS(tbg, g) \ | |
264 | tbg.space_id = g.space_id; \ | |
265 | tbg.bit_width = g.bit_width; \ | |
266 | tbg.bit_offset = g.bit_offset; \ | |
267 | tbg.access_width = g.access_width; \ | |
268 | tbg.address = g.address; | |
269 | ||
270 | TB_COPY_GAS(tboot->acpi_sinfo.pm1a_cnt_blk, fadt->xpm1a_control_block); | |
271 | TB_COPY_GAS(tboot->acpi_sinfo.pm1b_cnt_blk, fadt->xpm1b_control_block); | |
272 | TB_COPY_GAS(tboot->acpi_sinfo.pm1a_evt_blk, fadt->xpm1a_event_block); | |
273 | TB_COPY_GAS(tboot->acpi_sinfo.pm1b_evt_blk, fadt->xpm1b_event_block); | |
274 | ||
275 | /* | |
276 | * We need phys addr of waking vector, but can't use virt_to_phys() on | |
277 | * &acpi_gbl_FACS because it is ioremap'ed, so calc from FACS phys | |
278 | * addr. | |
279 | */ | |
280 | tboot->acpi_sinfo.wakeup_vector = fadt->facs + | |
281 | offsetof(struct acpi_table_facs, firmware_waking_vector); | |
282 | } | |
283 | ||
a1f37788 | 284 | static int tboot_sleep(u8 sleep_state, u32 pm1a_control, u32 pm1b_control) |
31625340 JC |
285 | { |
286 | static u32 acpi_shutdown_map[ACPI_S_STATE_COUNT] = { | |
287 | /* S0,1,2: */ -1, -1, -1, | |
288 | /* S3: */ TB_SHUTDOWN_S3, | |
289 | /* S4: */ TB_SHUTDOWN_S4, | |
290 | /* S5: */ TB_SHUTDOWN_S5 }; | |
291 | ||
292 | if (!tboot_enabled()) | |
a1f37788 | 293 | return 0; |
31625340 JC |
294 | |
295 | tboot_copy_fadt(&acpi_gbl_FADT); | |
296 | tboot->acpi_sinfo.pm1a_cnt_val = pm1a_control; | |
297 | tboot->acpi_sinfo.pm1b_cnt_val = pm1b_control; | |
298 | /* we always use the 32b wakeup vector */ | |
299 | tboot->acpi_sinfo.vector_width = 32; | |
31625340 JC |
300 | |
301 | if (sleep_state >= ACPI_S_STATE_COUNT || | |
302 | acpi_shutdown_map[sleep_state] == -1) { | |
8d3bcc44 | 303 | pr_warn("unsupported sleep state 0x%x\n", sleep_state); |
a1f37788 | 304 | return -1; |
31625340 JC |
305 | } |
306 | ||
307 | tboot_shutdown(acpi_shutdown_map[sleep_state]); | |
09f98a82 TL |
308 | return 0; |
309 | } | |
31625340 | 310 | |
01c6a6af BG |
311 | static int tboot_extended_sleep(u8 sleep_state, u32 val_a, u32 val_b) |
312 | { | |
313 | if (!tboot_enabled()) | |
314 | return 0; | |
315 | ||
8d3bcc44 | 316 | pr_warn("tboot is not able to suspend on platforms with reduced hardware sleep (ACPIv5)"); |
01c6a6af BG |
317 | return -ENODEV; |
318 | } | |
319 | ||
69575d38 SW |
320 | static atomic_t ap_wfs_count; |
321 | ||
322 | static int tboot_wait_for_aps(int num_aps) | |
31625340 JC |
323 | { |
324 | unsigned long timeout; | |
325 | ||
69575d38 SW |
326 | timeout = AP_WAIT_TIMEOUT*HZ; |
327 | while (atomic_read((atomic_t *)&tboot->num_in_wfs) != num_aps && | |
328 | timeout) { | |
329 | mdelay(1); | |
330 | timeout--; | |
331 | } | |
332 | ||
333 | if (timeout) | |
8d3bcc44 | 334 | pr_warn("tboot wait for APs timeout\n"); |
69575d38 SW |
335 | |
336 | return !(atomic_read((atomic_t *)&tboot->num_in_wfs) == num_aps); | |
337 | } | |
338 | ||
ae6a8a2e | 339 | static int tboot_dying_cpu(unsigned int cpu) |
69575d38 | 340 | { |
ae6a8a2e RC |
341 | atomic_inc(&ap_wfs_count); |
342 | if (num_online_cpus() == 1) { | |
343 | if (tboot_wait_for_aps(atomic_read(&ap_wfs_count))) | |
344 | return -EBUSY; | |
69575d38 | 345 | } |
ae6a8a2e | 346 | return 0; |
69575d38 SW |
347 | } |
348 | ||
13bfd47a QR |
349 | #ifdef CONFIG_DEBUG_FS |
350 | ||
351 | #define TBOOT_LOG_UUID { 0x26, 0x25, 0x19, 0xc0, 0x30, 0x6b, 0xb4, 0x4d, \ | |
352 | 0x4c, 0x84, 0xa3, 0xe9, 0x53, 0xb8, 0x81, 0x74 } | |
353 | ||
354 | #define TBOOT_SERIAL_LOG_ADDR 0x60000 | |
355 | #define TBOOT_SERIAL_LOG_SIZE 0x08000 | |
356 | #define LOG_MAX_SIZE_OFF 16 | |
357 | #define LOG_BUF_OFF 24 | |
358 | ||
359 | static uint8_t tboot_log_uuid[16] = TBOOT_LOG_UUID; | |
360 | ||
361 | static ssize_t tboot_log_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) | |
362 | { | |
363 | void __iomem *log_base; | |
364 | u8 log_uuid[16]; | |
365 | u32 max_size; | |
366 | void *kbuf; | |
367 | int ret = -EFAULT; | |
368 | ||
4bdc0d67 | 369 | log_base = ioremap(TBOOT_SERIAL_LOG_ADDR, TBOOT_SERIAL_LOG_SIZE); |
13bfd47a QR |
370 | if (!log_base) |
371 | return ret; | |
372 | ||
373 | memcpy_fromio(log_uuid, log_base, sizeof(log_uuid)); | |
374 | if (memcmp(&tboot_log_uuid, log_uuid, sizeof(log_uuid))) | |
375 | goto err_iounmap; | |
376 | ||
377 | max_size = readl(log_base + LOG_MAX_SIZE_OFF); | |
378 | if (*ppos >= max_size) { | |
379 | ret = 0; | |
380 | goto err_iounmap; | |
381 | } | |
382 | ||
383 | if (*ppos + count > max_size) | |
384 | count = max_size - *ppos; | |
385 | ||
386 | kbuf = kmalloc(count, GFP_KERNEL); | |
387 | if (!kbuf) { | |
388 | ret = -ENOMEM; | |
389 | goto err_iounmap; | |
390 | } | |
391 | ||
392 | memcpy_fromio(kbuf, log_base + LOG_BUF_OFF + *ppos, count); | |
393 | if (copy_to_user(user_buf, kbuf, count)) | |
394 | goto err_kfree; | |
395 | ||
396 | *ppos += count; | |
397 | ||
398 | ret = count; | |
399 | ||
400 | err_kfree: | |
401 | kfree(kbuf); | |
402 | ||
403 | err_iounmap: | |
404 | iounmap(log_base); | |
405 | ||
406 | return ret; | |
407 | } | |
408 | ||
409 | static const struct file_operations tboot_log_fops = { | |
410 | .read = tboot_log_read, | |
411 | .llseek = default_llseek, | |
412 | }; | |
413 | ||
414 | #endif /* CONFIG_DEBUG_FS */ | |
415 | ||
69575d38 SW |
416 | static __init int tboot_late_init(void) |
417 | { | |
31625340 JC |
418 | if (!tboot_enabled()) |
419 | return 0; | |
420 | ||
11520e5e LT |
421 | tboot_create_trampoline(); |
422 | ||
69575d38 | 423 | atomic_set(&ap_wfs_count, 0); |
73c1b41e | 424 | cpuhp_setup_state(CPUHP_AP_X86_TBOOT_DYING, "x86/tboot:dying", NULL, |
ae6a8a2e | 425 | tboot_dying_cpu); |
13bfd47a QR |
426 | #ifdef CONFIG_DEBUG_FS |
427 | debugfs_create_file("tboot_log", S_IRUSR, | |
428 | arch_debugfs_dir, NULL, &tboot_log_fops); | |
429 | #endif | |
430 | ||
a1f37788 | 431 | acpi_os_set_prepare_sleep(&tboot_sleep); |
01c6a6af | 432 | acpi_os_set_prepare_extended_sleep(&tboot_extended_sleep); |
69575d38 | 433 | return 0; |
31625340 JC |
434 | } |
435 | ||
69575d38 SW |
436 | late_initcall(tboot_late_init); |
437 | ||
31625340 JC |
438 | /* |
439 | * TXT configuration registers (offsets from TXT_{PUB, PRIV}_CONFIG_REGS_BASE) | |
440 | */ | |
441 | ||
442 | #define TXT_PUB_CONFIG_REGS_BASE 0xfed30000 | |
443 | #define TXT_PRIV_CONFIG_REGS_BASE 0xfed20000 | |
444 | ||
445 | /* # pages for each config regs space - used by fixmap */ | |
446 | #define NR_TXT_CONFIG_PAGES ((TXT_PUB_CONFIG_REGS_BASE - \ | |
447 | TXT_PRIV_CONFIG_REGS_BASE) >> PAGE_SHIFT) | |
448 | ||
449 | /* offsets from pub/priv config space */ | |
450 | #define TXTCR_HEAP_BASE 0x0300 | |
451 | #define TXTCR_HEAP_SIZE 0x0308 | |
452 | ||
453 | #define SHA1_SIZE 20 | |
454 | ||
455 | struct sha1_hash { | |
456 | u8 hash[SHA1_SIZE]; | |
457 | }; | |
458 | ||
459 | struct sinit_mle_data { | |
460 | u32 version; /* currently 6 */ | |
461 | struct sha1_hash bios_acm_id; | |
462 | u32 edx_senter_flags; | |
463 | u64 mseg_valid; | |
464 | struct sha1_hash sinit_hash; | |
465 | struct sha1_hash mle_hash; | |
466 | struct sha1_hash stm_hash; | |
467 | struct sha1_hash lcp_policy_hash; | |
468 | u32 lcp_policy_control; | |
469 | u32 rlp_wakeup_addr; | |
470 | u32 reserved; | |
471 | u32 num_mdrs; | |
472 | u32 mdrs_off; | |
473 | u32 num_vtd_dmars; | |
474 | u32 vtd_dmars_off; | |
475 | } __packed; | |
476 | ||
477 | struct acpi_table_header *tboot_get_dmar_table(struct acpi_table_header *dmar_tbl) | |
478 | { | |
479 | void *heap_base, *heap_ptr, *config; | |
480 | ||
481 | if (!tboot_enabled()) | |
482 | return dmar_tbl; | |
483 | ||
484 | /* | |
485 | * ACPI tables may not be DMA protected by tboot, so use DMAR copy | |
486 | * SINIT saved in SinitMleData in TXT heap (which is DMA protected) | |
487 | */ | |
488 | ||
489 | /* map config space in order to get heap addr */ | |
490 | config = ioremap(TXT_PUB_CONFIG_REGS_BASE, NR_TXT_CONFIG_PAGES * | |
491 | PAGE_SIZE); | |
492 | if (!config) | |
493 | return NULL; | |
494 | ||
495 | /* now map TXT heap */ | |
496 | heap_base = ioremap(*(u64 *)(config + TXTCR_HEAP_BASE), | |
497 | *(u64 *)(config + TXTCR_HEAP_SIZE)); | |
498 | iounmap(config); | |
499 | if (!heap_base) | |
500 | return NULL; | |
501 | ||
502 | /* walk heap to SinitMleData */ | |
503 | /* skip BiosData */ | |
504 | heap_ptr = heap_base + *(u64 *)heap_base; | |
505 | /* skip OsMleData */ | |
506 | heap_ptr += *(u64 *)heap_ptr; | |
507 | /* skip OsSinitData */ | |
508 | heap_ptr += *(u64 *)heap_ptr; | |
509 | /* now points to SinitMleDataSize; set to SinitMleData */ | |
510 | heap_ptr += sizeof(u64); | |
511 | /* get addr of DMAR table */ | |
512 | dmar_tbl = (struct acpi_table_header *)(heap_ptr + | |
513 | ((struct sinit_mle_data *)heap_ptr)->vtd_dmars_off - | |
514 | sizeof(u64)); | |
515 | ||
516 | /* don't unmap heap because dmar.c needs access to this */ | |
517 | ||
518 | return dmar_tbl; | |
519 | } | |
520 | ||
521 | int tboot_force_iommu(void) | |
522 | { | |
523 | if (!tboot_enabled()) | |
524 | return 0; | |
525 | ||
e2be2a83 | 526 | if (no_iommu || dmar_disabled) |
8d3bcc44 | 527 | pr_warn("Forcing Intel-IOMMU to enabled\n"); |
31625340 JC |
528 | |
529 | dmar_disabled = 0; | |
31625340 JC |
530 | no_iommu = 0; |
531 | ||
532 | return 1; | |
533 | } |