Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 | 2 | /* |
835c34a1 | 3 | * prepare to run common code |
1da177e4 LT |
4 | * |
5 | * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE | |
1da177e4 LT |
6 | */ |
7 | ||
be3606ff | 8 | #define DISABLE_BRANCH_PROFILING |
1da177e4 LT |
9 | #include <linux/init.h> |
10 | #include <linux/linkage.h> | |
11 | #include <linux/types.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/string.h> | |
14 | #include <linux/percpu.h> | |
eaf76e8b | 15 | #include <linux/start_kernel.h> |
8b664aa6 | 16 | #include <linux/io.h> |
72d7c3b3 | 17 | #include <linux/memblock.h> |
5868f365 | 18 | #include <linux/mem_encrypt.h> |
1da177e4 LT |
19 | |
20 | #include <asm/processor.h> | |
21 | #include <asm/proto.h> | |
22 | #include <asm/smp.h> | |
1da177e4 LT |
23 | #include <asm/setup.h> |
24 | #include <asm/desc.h> | |
f6c2e333 | 25 | #include <asm/pgtable.h> |
cfd243d4 | 26 | #include <asm/tlbflush.h> |
2bc0414e | 27 | #include <asm/sections.h> |
718fc13b | 28 | #include <asm/kdebug.h> |
66441bd3 | 29 | #include <asm/e820/api.h> |
47a3d5da | 30 | #include <asm/bios_ebda.h> |
5dcd14ec | 31 | #include <asm/bootparam_utils.h> |
feddc9de | 32 | #include <asm/microcode.h> |
ef7f0d6a | 33 | #include <asm/kasan.h> |
1da177e4 | 34 | |
39b95522 KS |
35 | #ifdef CONFIG_X86_5LEVEL |
36 | #undef pgtable_l5_enabled | |
37 | #define pgtable_l5_enabled __pgtable_l5_enabled | |
38 | #endif | |
39 | ||
8170e6be PA |
40 | /* |
41 | * Manage page tables very early on. | |
42 | */ | |
8170e6be | 43 | extern pmd_t early_dynamic_pgts[EARLY_DYNAMIC_PAGE_TABLES][PTRS_PER_PMD]; |
c88d7150 | 44 | static unsigned int __initdata next_early_pgt; |
5e427ec2 | 45 | pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX); |
8170e6be | 46 | |
e626e6bb | 47 | #ifdef CONFIG_X86_5LEVEL |
39b95522 KS |
48 | unsigned int __pgtable_l5_enabled __ro_after_init; |
49 | EXPORT_SYMBOL(__pgtable_l5_enabled); | |
b16e770b | 50 | unsigned int pgdir_shift __ro_after_init = 39; |
c65e774f | 51 | EXPORT_SYMBOL(pgdir_shift); |
b16e770b | 52 | unsigned int ptrs_per_p4d __ro_after_init = 1; |
c65e774f | 53 | EXPORT_SYMBOL(ptrs_per_p4d); |
e626e6bb KS |
54 | #endif |
55 | ||
eedb92ab | 56 | #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT |
4fa5662b | 57 | unsigned long page_offset_base __ro_after_init = __PAGE_OFFSET_BASE_L4; |
eedb92ab | 58 | EXPORT_SYMBOL(page_offset_base); |
a7412546 | 59 | unsigned long vmalloc_base __ro_after_init = __VMALLOC_BASE_L4; |
eedb92ab | 60 | EXPORT_SYMBOL(vmalloc_base); |
9b46a051 | 61 | unsigned long vmemmap_base __ro_after_init = __VMEMMAP_BASE_L4; |
eedb92ab KS |
62 | EXPORT_SYMBOL(vmemmap_base); |
63 | #endif | |
64 | ||
26179670 KS |
65 | #define __head __section(.head.text) |
66 | ||
67 | static void __head *fixup_pointer(void *ptr, unsigned long physaddr) | |
c88d7150 KS |
68 | { |
69 | return ptr - (void *)_text + (void *)physaddr; | |
70 | } | |
71 | ||
4fa5662b KS |
72 | static unsigned long __head *fixup_long(void *ptr, unsigned long physaddr) |
73 | { | |
74 | return fixup_pointer(ptr, physaddr); | |
75 | } | |
76 | ||
4c2b4058 KS |
77 | #ifdef CONFIG_X86_5LEVEL |
78 | static unsigned int __head *fixup_int(void *ptr, unsigned long physaddr) | |
79 | { | |
80 | return fixup_pointer(ptr, physaddr); | |
81 | } | |
82 | ||
6f9dd329 | 83 | static bool __head check_la57_support(unsigned long physaddr) |
4c2b4058 KS |
84 | { |
85 | if (native_cpuid_eax(0) < 7) | |
6f9dd329 | 86 | return false; |
4c2b4058 KS |
87 | |
88 | if (!(native_cpuid_ecx(7) & (1 << (X86_FEATURE_LA57 & 31)))) | |
6f9dd329 | 89 | return false; |
4c2b4058 KS |
90 | |
91 | *fixup_int(&pgtable_l5_enabled, physaddr) = 1; | |
b16e770b KS |
92 | *fixup_int(&pgdir_shift, physaddr) = 48; |
93 | *fixup_int(&ptrs_per_p4d, physaddr) = 512; | |
4fa5662b | 94 | *fixup_long(&page_offset_base, physaddr) = __PAGE_OFFSET_BASE_L5; |
a7412546 | 95 | *fixup_long(&vmalloc_base, physaddr) = __VMALLOC_BASE_L5; |
9b46a051 | 96 | *fixup_long(&vmemmap_base, physaddr) = __VMEMMAP_BASE_L5; |
6f9dd329 KS |
97 | |
98 | return true; | |
4c2b4058 KS |
99 | } |
100 | #else | |
6f9dd329 KS |
101 | static bool __head check_la57_support(unsigned long physaddr) |
102 | { | |
103 | return false; | |
104 | } | |
4c2b4058 KS |
105 | #endif |
106 | ||
aca20d54 TL |
107 | unsigned long __head __startup_64(unsigned long physaddr, |
108 | struct boot_params *bp) | |
c88d7150 | 109 | { |
6f9dd329 | 110 | unsigned long load_delta, *p; |
5868f365 | 111 | unsigned long pgtable_flags; |
c88d7150 | 112 | pgdval_t *pgd; |
032370b9 | 113 | p4dval_t *p4d; |
c88d7150 KS |
114 | pudval_t *pud; |
115 | pmdval_t *pmd, pmd_entry; | |
6f9dd329 | 116 | bool la57; |
c88d7150 | 117 | int i; |
187e91fe | 118 | unsigned int *next_pgt_ptr; |
c88d7150 | 119 | |
6f9dd329 | 120 | la57 = check_la57_support(physaddr); |
4c2b4058 | 121 | |
c88d7150 KS |
122 | /* Is the address too large? */ |
123 | if (physaddr >> MAX_PHYSMEM_BITS) | |
124 | for (;;); | |
125 | ||
126 | /* | |
127 | * Compute the delta between the address I am compiled to run at | |
128 | * and the address I am actually running at. | |
129 | */ | |
130 | load_delta = physaddr - (unsigned long)(_text - __START_KERNEL_map); | |
131 | ||
132 | /* Is the address not 2M aligned? */ | |
133 | if (load_delta & ~PMD_PAGE_MASK) | |
134 | for (;;); | |
135 | ||
5868f365 | 136 | /* Activate Secure Memory Encryption (SME) if supported and enabled */ |
aca20d54 | 137 | sme_enable(bp); |
5868f365 TL |
138 | |
139 | /* Include the SME encryption mask in the fixup value */ | |
140 | load_delta += sme_get_me_mask(); | |
141 | ||
c88d7150 KS |
142 | /* Fixup the physical addresses in the page table */ |
143 | ||
65ade2f8 | 144 | pgd = fixup_pointer(&early_top_pgt, physaddr); |
6f9dd329 KS |
145 | p = pgd + pgd_index(__START_KERNEL_map); |
146 | if (la57) | |
147 | *p = (unsigned long)level4_kernel_pgt; | |
148 | else | |
149 | *p = (unsigned long)level3_kernel_pgt; | |
150 | *p += _PAGE_TABLE_NOENC - __START_KERNEL_map + load_delta; | |
151 | ||
152 | if (la57) { | |
032370b9 KS |
153 | p4d = fixup_pointer(&level4_kernel_pgt, physaddr); |
154 | p4d[511] += load_delta; | |
155 | } | |
156 | ||
c88d7150 KS |
157 | pud = fixup_pointer(&level3_kernel_pgt, physaddr); |
158 | pud[510] += load_delta; | |
159 | pud[511] += load_delta; | |
160 | ||
161 | pmd = fixup_pointer(level2_fixmap_pgt, physaddr); | |
162 | pmd[506] += load_delta; | |
163 | ||
164 | /* | |
165 | * Set up the identity mapping for the switchover. These | |
166 | * entries should *NOT* have the global bit set! This also | |
167 | * creates a bunch of nonsense entries but that is fine -- | |
168 | * it avoids problems around wraparound. | |
169 | */ | |
170 | ||
187e91fe AP |
171 | next_pgt_ptr = fixup_pointer(&next_early_pgt, physaddr); |
172 | pud = fixup_pointer(early_dynamic_pgts[(*next_pgt_ptr)++], physaddr); | |
173 | pmd = fixup_pointer(early_dynamic_pgts[(*next_pgt_ptr)++], physaddr); | |
c88d7150 | 174 | |
21729f81 | 175 | pgtable_flags = _KERNPG_TABLE_NOENC + sme_get_me_mask(); |
c88d7150 | 176 | |
6f9dd329 | 177 | if (la57) { |
032370b9 KS |
178 | p4d = fixup_pointer(early_dynamic_pgts[next_early_pgt++], physaddr); |
179 | ||
180 | i = (physaddr >> PGDIR_SHIFT) % PTRS_PER_PGD; | |
5868f365 TL |
181 | pgd[i + 0] = (pgdval_t)p4d + pgtable_flags; |
182 | pgd[i + 1] = (pgdval_t)p4d + pgtable_flags; | |
032370b9 KS |
183 | |
184 | i = (physaddr >> P4D_SHIFT) % PTRS_PER_P4D; | |
5868f365 TL |
185 | p4d[i + 0] = (pgdval_t)pud + pgtable_flags; |
186 | p4d[i + 1] = (pgdval_t)pud + pgtable_flags; | |
032370b9 KS |
187 | } else { |
188 | i = (physaddr >> PGDIR_SHIFT) % PTRS_PER_PGD; | |
5868f365 TL |
189 | pgd[i + 0] = (pgdval_t)pud + pgtable_flags; |
190 | pgd[i + 1] = (pgdval_t)pud + pgtable_flags; | |
032370b9 | 191 | } |
c88d7150 KS |
192 | |
193 | i = (physaddr >> PUD_SHIFT) % PTRS_PER_PUD; | |
5868f365 TL |
194 | pud[i + 0] = (pudval_t)pmd + pgtable_flags; |
195 | pud[i + 1] = (pudval_t)pmd + pgtable_flags; | |
c88d7150 KS |
196 | |
197 | pmd_entry = __PAGE_KERNEL_LARGE_EXEC & ~_PAGE_GLOBAL; | |
5868f365 | 198 | pmd_entry += sme_get_me_mask(); |
c88d7150 KS |
199 | pmd_entry += physaddr; |
200 | ||
201 | for (i = 0; i < DIV_ROUND_UP(_end - _text, PMD_SIZE); i++) { | |
202 | int idx = i + (physaddr >> PMD_SHIFT) % PTRS_PER_PMD; | |
203 | pmd[idx] = pmd_entry + i * PMD_SIZE; | |
204 | } | |
205 | ||
206 | /* | |
207 | * Fixup the kernel text+data virtual addresses. Note that | |
208 | * we might write invalid pmds, when the kernel is relocated | |
209 | * cleanup_highmap() fixes this up along with the mappings | |
210 | * beyond _end. | |
211 | */ | |
212 | ||
213 | pmd = fixup_pointer(level2_kernel_pgt, physaddr); | |
214 | for (i = 0; i < PTRS_PER_PMD; i++) { | |
215 | if (pmd[i] & _PAGE_PRESENT) | |
216 | pmd[i] += load_delta; | |
217 | } | |
218 | ||
5868f365 TL |
219 | /* |
220 | * Fixup phys_base - remove the memory encryption mask to obtain | |
221 | * the true physical address. | |
222 | */ | |
4fa5662b | 223 | *fixup_long(&phys_base, physaddr) += load_delta - sme_get_me_mask(); |
5868f365 | 224 | |
107cd253 TL |
225 | /* Encrypt the kernel and related (if SME is active) */ |
226 | sme_encrypt_kernel(bp); | |
5868f365 TL |
227 | |
228 | /* | |
229 | * Return the SME encryption mask (if SME is active) to be used as a | |
230 | * modifier for the initial pgdir entry programmed into CR3. | |
231 | */ | |
232 | return sme_get_me_mask(); | |
233 | } | |
234 | ||
235 | unsigned long __startup_secondary_64(void) | |
236 | { | |
237 | /* | |
238 | * Return the SME encryption mask (if SME is active) to be used as a | |
239 | * modifier for the initial pgdir entry programmed into CR3. | |
240 | */ | |
241 | return sme_get_me_mask(); | |
c88d7150 KS |
242 | } |
243 | ||
8170e6be PA |
244 | /* Wipe all early page tables except for the kernel symbol map */ |
245 | static void __init reset_early_page_tables(void) | |
cfd243d4 | 246 | { |
65ade2f8 | 247 | memset(early_top_pgt, 0, sizeof(pgd_t)*(PTRS_PER_PGD-1)); |
8170e6be | 248 | next_early_pgt = 0; |
21729f81 | 249 | write_cr3(__sme_pa_nodebug(early_top_pgt)); |
8170e6be PA |
250 | } |
251 | ||
252 | /* Create a new PMD entry */ | |
b9d05200 | 253 | int __init __early_make_pgtable(unsigned long address, pmdval_t pmd) |
8170e6be PA |
254 | { |
255 | unsigned long physaddr = address - __PAGE_OFFSET; | |
8170e6be | 256 | pgdval_t pgd, *pgd_p; |
032370b9 | 257 | p4dval_t p4d, *p4d_p; |
6b9c75ac | 258 | pudval_t pud, *pud_p; |
b9d05200 | 259 | pmdval_t *pmd_p; |
8170e6be PA |
260 | |
261 | /* Invalid address or early pgt is done ? */ | |
65ade2f8 | 262 | if (physaddr >= MAXMEM || read_cr3_pa() != __pa_nodebug(early_top_pgt)) |
8170e6be PA |
263 | return -1; |
264 | ||
6b9c75ac | 265 | again: |
65ade2f8 | 266 | pgd_p = &early_top_pgt[pgd_index(address)].pgd; |
8170e6be PA |
267 | pgd = *pgd_p; |
268 | ||
269 | /* | |
270 | * The use of __START_KERNEL_map rather than __PAGE_OFFSET here is | |
271 | * critical -- __PAGE_OFFSET would point us back into the dynamic | |
272 | * range and we might end up looping forever... | |
273 | */ | |
6f9dd329 | 274 | if (!pgtable_l5_enabled) |
032370b9 KS |
275 | p4d_p = pgd_p; |
276 | else if (pgd) | |
277 | p4d_p = (p4dval_t *)((pgd & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
278 | else { | |
279 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
280 | reset_early_page_tables(); | |
281 | goto again; | |
282 | } | |
283 | ||
284 | p4d_p = (p4dval_t *)early_dynamic_pgts[next_early_pgt++]; | |
285 | memset(p4d_p, 0, sizeof(*p4d_p) * PTRS_PER_P4D); | |
286 | *pgd_p = (pgdval_t)p4d_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; | |
287 | } | |
288 | p4d_p += p4d_index(address); | |
289 | p4d = *p4d_p; | |
290 | ||
291 | if (p4d) | |
292 | pud_p = (pudval_t *)((p4d & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
6b9c75ac YL |
293 | else { |
294 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
8170e6be | 295 | reset_early_page_tables(); |
6b9c75ac YL |
296 | goto again; |
297 | } | |
8170e6be PA |
298 | |
299 | pud_p = (pudval_t *)early_dynamic_pgts[next_early_pgt++]; | |
a91bbe01 | 300 | memset(pud_p, 0, sizeof(*pud_p) * PTRS_PER_PUD); |
032370b9 | 301 | *p4d_p = (p4dval_t)pud_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; |
8170e6be | 302 | } |
6b9c75ac YL |
303 | pud_p += pud_index(address); |
304 | pud = *pud_p; | |
8170e6be | 305 | |
6b9c75ac YL |
306 | if (pud) |
307 | pmd_p = (pmdval_t *)((pud & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
308 | else { | |
309 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
310 | reset_early_page_tables(); | |
311 | goto again; | |
312 | } | |
313 | ||
314 | pmd_p = (pmdval_t *)early_dynamic_pgts[next_early_pgt++]; | |
a91bbe01 | 315 | memset(pmd_p, 0, sizeof(*pmd_p) * PTRS_PER_PMD); |
6b9c75ac YL |
316 | *pud_p = (pudval_t)pmd_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; |
317 | } | |
6b9c75ac | 318 | pmd_p[pmd_index(address)] = pmd; |
8170e6be PA |
319 | |
320 | return 0; | |
cfd243d4 VG |
321 | } |
322 | ||
b9d05200 TL |
323 | int __init early_make_pgtable(unsigned long address) |
324 | { | |
325 | unsigned long physaddr = address - __PAGE_OFFSET; | |
326 | pmdval_t pmd; | |
327 | ||
328 | pmd = (physaddr & PMD_MASK) + early_pmd_flags; | |
329 | ||
330 | return __early_make_pgtable(address, pmd); | |
331 | } | |
332 | ||
1da177e4 LT |
333 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
334 | yet. */ | |
335 | static void __init clear_bss(void) | |
336 | { | |
1da177e4 | 337 | memset(__bss_start, 0, |
2bc0414e | 338 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
1da177e4 LT |
339 | } |
340 | ||
f1da834c YL |
341 | static unsigned long get_cmd_line_ptr(void) |
342 | { | |
343 | unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; | |
344 | ||
ee92d815 YL |
345 | cmd_line_ptr |= (u64)boot_params.ext_cmd_line_ptr << 32; |
346 | ||
f1da834c YL |
347 | return cmd_line_ptr; |
348 | } | |
349 | ||
1da177e4 LT |
350 | static void __init copy_bootdata(char *real_mode_data) |
351 | { | |
1da177e4 | 352 | char * command_line; |
f1da834c | 353 | unsigned long cmd_line_ptr; |
1da177e4 | 354 | |
b9d05200 TL |
355 | /* |
356 | * If SME is active, this will create decrypted mappings of the | |
357 | * boot data in advance of the copy operations. | |
358 | */ | |
359 | sme_map_bootdata(real_mode_data); | |
360 | ||
30c82645 | 361 | memcpy(&boot_params, real_mode_data, sizeof boot_params); |
5dcd14ec | 362 | sanitize_boot_params(&boot_params); |
f1da834c YL |
363 | cmd_line_ptr = get_cmd_line_ptr(); |
364 | if (cmd_line_ptr) { | |
365 | command_line = __va(cmd_line_ptr); | |
30c82645 | 366 | memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
1da177e4 | 367 | } |
b9d05200 TL |
368 | |
369 | /* | |
370 | * The old boot data is no longer needed and won't be reserved, | |
371 | * freeing up that memory for use by the system. If SME is active, | |
372 | * we need to remove the mappings that were created so that the | |
373 | * memory doesn't remain mapped as decrypted. | |
374 | */ | |
375 | sme_unmap_bootdata(real_mode_data); | |
1da177e4 LT |
376 | } |
377 | ||
2605fc21 | 378 | asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data) |
1da177e4 | 379 | { |
b4e0409a IM |
380 | /* |
381 | * Build-time sanity checks on the kernel image and module | |
382 | * area mappings. (these are purely build-time and produce no code) | |
383 | */ | |
8e3c2a8c BP |
384 | BUILD_BUG_ON(MODULES_VADDR < __START_KERNEL_map); |
385 | BUILD_BUG_ON(MODULES_VADDR - __START_KERNEL_map < KERNEL_IMAGE_SIZE); | |
b4e0409a | 386 | BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE); |
8e3c2a8c | 387 | BUILD_BUG_ON((__START_KERNEL_map & ~PMD_MASK) != 0); |
b4e0409a IM |
388 | BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0); |
389 | BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL)); | |
c65e774f | 390 | MAYBE_BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) == |
b4e0409a | 391 | (__START_KERNEL & PGDIR_MASK))); |
66d4bdf2 | 392 | BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END); |
b4e0409a | 393 | |
1e02ce4c AL |
394 | cr4_init_shadow(); |
395 | ||
8170e6be PA |
396 | /* Kill off the identity-map trampoline */ |
397 | reset_early_page_tables(); | |
398 | ||
3df0af0e YL |
399 | clear_bss(); |
400 | ||
65ade2f8 | 401 | clear_page(init_top_pgt); |
d0f77d4d | 402 | |
21729f81 TL |
403 | /* |
404 | * SME support may update early_pmd_flags to include the memory | |
405 | * encryption mask, so it needs to be called before anything | |
406 | * that may generate a page fault. | |
407 | */ | |
408 | sme_early_init(); | |
409 | ||
5d5aa3cf AP |
410 | kasan_early_init(); |
411 | ||
588787fd | 412 | idt_setup_early_handler(); |
f6c2e333 | 413 | |
fa2bbce9 YL |
414 | copy_bootdata(__va(real_mode_data)); |
415 | ||
feddc9de FY |
416 | /* |
417 | * Load microcode early on BSP. | |
418 | */ | |
419 | load_ucode_bsp(); | |
420 | ||
65ade2f8 KS |
421 | /* set init_top_pgt kernel high mapping*/ |
422 | init_top_pgt[511] = early_top_pgt[511]; | |
8170e6be | 423 | |
f97013fd JF |
424 | x86_64_start_reservations(real_mode_data); |
425 | } | |
426 | ||
427 | void __init x86_64_start_reservations(char *real_mode_data) | |
428 | { | |
fa2bbce9 YL |
429 | /* version is always not zero if it is copied */ |
430 | if (!boot_params.hdr.version) | |
431 | copy_bootdata(__va(real_mode_data)); | |
9de819fe | 432 | |
8d152e7a | 433 | x86_early_init_platform_quirks(); |
75175278 | 434 | |
3fda5bb4 AS |
435 | switch (boot_params.hdr.hardware_subarch) { |
436 | case X86_SUBARCH_INTEL_MID: | |
437 | x86_intel_mid_early_setup(); | |
438 | break; | |
439 | default: | |
440 | break; | |
441 | } | |
442 | ||
1da177e4 LT |
443 | start_kernel(); |
444 | } |