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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 |
ad3fe525 KS |
9 | |
10 | /* cpu_feature_enabled() cannot be used this early */ | |
11 | #define USE_EARLY_PGTABLE_L5 | |
12 | ||
1da177e4 LT |
13 | #include <linux/init.h> |
14 | #include <linux/linkage.h> | |
15 | #include <linux/types.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/string.h> | |
18 | #include <linux/percpu.h> | |
eaf76e8b | 19 | #include <linux/start_kernel.h> |
8b664aa6 | 20 | #include <linux/io.h> |
72d7c3b3 | 21 | #include <linux/memblock.h> |
5868f365 | 22 | #include <linux/mem_encrypt.h> |
1da177e4 LT |
23 | |
24 | #include <asm/processor.h> | |
25 | #include <asm/proto.h> | |
26 | #include <asm/smp.h> | |
1da177e4 LT |
27 | #include <asm/setup.h> |
28 | #include <asm/desc.h> | |
f6c2e333 | 29 | #include <asm/pgtable.h> |
cfd243d4 | 30 | #include <asm/tlbflush.h> |
2bc0414e | 31 | #include <asm/sections.h> |
718fc13b | 32 | #include <asm/kdebug.h> |
66441bd3 | 33 | #include <asm/e820/api.h> |
47a3d5da | 34 | #include <asm/bios_ebda.h> |
5dcd14ec | 35 | #include <asm/bootparam_utils.h> |
feddc9de | 36 | #include <asm/microcode.h> |
ef7f0d6a | 37 | #include <asm/kasan.h> |
05ab1d8a | 38 | #include <asm/fixmap.h> |
1da177e4 | 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 |
51be1335 | 48 | unsigned int __pgtable_l5_enabled __ro_after_init; |
b16e770b | 49 | unsigned int pgdir_shift __ro_after_init = 39; |
c65e774f | 50 | EXPORT_SYMBOL(pgdir_shift); |
b16e770b | 51 | unsigned int ptrs_per_p4d __ro_after_init = 1; |
c65e774f | 52 | EXPORT_SYMBOL(ptrs_per_p4d); |
e626e6bb KS |
53 | #endif |
54 | ||
eedb92ab | 55 | #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT |
4fa5662b | 56 | unsigned long page_offset_base __ro_after_init = __PAGE_OFFSET_BASE_L4; |
eedb92ab | 57 | EXPORT_SYMBOL(page_offset_base); |
a7412546 | 58 | unsigned long vmalloc_base __ro_after_init = __VMALLOC_BASE_L4; |
eedb92ab | 59 | EXPORT_SYMBOL(vmalloc_base); |
9b46a051 | 60 | unsigned long vmemmap_base __ro_after_init = __VMEMMAP_BASE_L4; |
eedb92ab KS |
61 | EXPORT_SYMBOL(vmemmap_base); |
62 | #endif | |
63 | ||
26179670 KS |
64 | #define __head __section(.head.text) |
65 | ||
66 | static void __head *fixup_pointer(void *ptr, unsigned long physaddr) | |
c88d7150 KS |
67 | { |
68 | return ptr - (void *)_text + (void *)physaddr; | |
69 | } | |
70 | ||
4fa5662b KS |
71 | static unsigned long __head *fixup_long(void *ptr, unsigned long physaddr) |
72 | { | |
73 | return fixup_pointer(ptr, physaddr); | |
74 | } | |
75 | ||
4c2b4058 KS |
76 | #ifdef CONFIG_X86_5LEVEL |
77 | static unsigned int __head *fixup_int(void *ptr, unsigned long physaddr) | |
78 | { | |
79 | return fixup_pointer(ptr, physaddr); | |
80 | } | |
81 | ||
6f9dd329 | 82 | static bool __head check_la57_support(unsigned long physaddr) |
4c2b4058 | 83 | { |
372fddf7 KS |
84 | /* |
85 | * 5-level paging is detected and enabled at kernel decomression | |
86 | * stage. Only check if it has been enabled there. | |
87 | */ | |
88 | if (!(native_read_cr4() & X86_CR4_LA57)) | |
6f9dd329 | 89 | return false; |
4c2b4058 | 90 | |
ad3fe525 | 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 | ||
4a09f021 AP |
107 | /* Code in __startup_64() can be relocated during execution, but the compiler |
108 | * doesn't have to generate PC-relative relocations when accessing globals from | |
109 | * that function. Clang actually does not generate them, which leads to | |
110 | * boot-time crashes. To work around this problem, every global pointer must | |
111 | * be adjusted using fixup_pointer(). | |
112 | */ | |
aca20d54 TL |
113 | unsigned long __head __startup_64(unsigned long physaddr, |
114 | struct boot_params *bp) | |
c88d7150 | 115 | { |
b3f0907c | 116 | unsigned long vaddr, vaddr_end; |
6f9dd329 | 117 | unsigned long load_delta, *p; |
5868f365 | 118 | unsigned long pgtable_flags; |
c88d7150 | 119 | pgdval_t *pgd; |
032370b9 | 120 | p4dval_t *p4d; |
c88d7150 KS |
121 | pudval_t *pud; |
122 | pmdval_t *pmd, pmd_entry; | |
4a09f021 | 123 | pteval_t *mask_ptr; |
6f9dd329 | 124 | bool la57; |
c88d7150 | 125 | int i; |
187e91fe | 126 | unsigned int *next_pgt_ptr; |
c88d7150 | 127 | |
6f9dd329 | 128 | la57 = check_la57_support(physaddr); |
4c2b4058 | 129 | |
c88d7150 KS |
130 | /* Is the address too large? */ |
131 | if (physaddr >> MAX_PHYSMEM_BITS) | |
132 | for (;;); | |
133 | ||
134 | /* | |
135 | * Compute the delta between the address I am compiled to run at | |
136 | * and the address I am actually running at. | |
137 | */ | |
138 | load_delta = physaddr - (unsigned long)(_text - __START_KERNEL_map); | |
139 | ||
140 | /* Is the address not 2M aligned? */ | |
141 | if (load_delta & ~PMD_PAGE_MASK) | |
142 | for (;;); | |
143 | ||
5868f365 | 144 | /* Activate Secure Memory Encryption (SME) if supported and enabled */ |
aca20d54 | 145 | sme_enable(bp); |
5868f365 TL |
146 | |
147 | /* Include the SME encryption mask in the fixup value */ | |
148 | load_delta += sme_get_me_mask(); | |
149 | ||
c88d7150 KS |
150 | /* Fixup the physical addresses in the page table */ |
151 | ||
65ade2f8 | 152 | pgd = fixup_pointer(&early_top_pgt, physaddr); |
6f9dd329 KS |
153 | p = pgd + pgd_index(__START_KERNEL_map); |
154 | if (la57) | |
155 | *p = (unsigned long)level4_kernel_pgt; | |
156 | else | |
157 | *p = (unsigned long)level3_kernel_pgt; | |
158 | *p += _PAGE_TABLE_NOENC - __START_KERNEL_map + load_delta; | |
159 | ||
160 | if (la57) { | |
032370b9 KS |
161 | p4d = fixup_pointer(&level4_kernel_pgt, physaddr); |
162 | p4d[511] += load_delta; | |
163 | } | |
164 | ||
c88d7150 KS |
165 | pud = fixup_pointer(&level3_kernel_pgt, physaddr); |
166 | pud[510] += load_delta; | |
167 | pud[511] += load_delta; | |
168 | ||
169 | pmd = fixup_pointer(level2_fixmap_pgt, physaddr); | |
05ab1d8a FT |
170 | for (i = FIXMAP_PMD_TOP; i > FIXMAP_PMD_TOP - FIXMAP_PMD_NUM; i--) |
171 | pmd[i] += load_delta; | |
c88d7150 KS |
172 | |
173 | /* | |
174 | * Set up the identity mapping for the switchover. These | |
175 | * entries should *NOT* have the global bit set! This also | |
176 | * creates a bunch of nonsense entries but that is fine -- | |
177 | * it avoids problems around wraparound. | |
178 | */ | |
179 | ||
187e91fe AP |
180 | next_pgt_ptr = fixup_pointer(&next_early_pgt, physaddr); |
181 | pud = fixup_pointer(early_dynamic_pgts[(*next_pgt_ptr)++], physaddr); | |
182 | pmd = fixup_pointer(early_dynamic_pgts[(*next_pgt_ptr)++], physaddr); | |
c88d7150 | 183 | |
21729f81 | 184 | pgtable_flags = _KERNPG_TABLE_NOENC + sme_get_me_mask(); |
c88d7150 | 185 | |
6f9dd329 | 186 | if (la57) { |
032370b9 KS |
187 | p4d = fixup_pointer(early_dynamic_pgts[next_early_pgt++], physaddr); |
188 | ||
189 | i = (physaddr >> PGDIR_SHIFT) % PTRS_PER_PGD; | |
5868f365 TL |
190 | pgd[i + 0] = (pgdval_t)p4d + pgtable_flags; |
191 | pgd[i + 1] = (pgdval_t)p4d + pgtable_flags; | |
032370b9 | 192 | |
81c7ed29 KS |
193 | i = physaddr >> P4D_SHIFT; |
194 | p4d[(i + 0) % PTRS_PER_P4D] = (pgdval_t)pud + pgtable_flags; | |
195 | p4d[(i + 1) % PTRS_PER_P4D] = (pgdval_t)pud + pgtable_flags; | |
032370b9 KS |
196 | } else { |
197 | i = (physaddr >> PGDIR_SHIFT) % PTRS_PER_PGD; | |
5868f365 TL |
198 | pgd[i + 0] = (pgdval_t)pud + pgtable_flags; |
199 | pgd[i + 1] = (pgdval_t)pud + pgtable_flags; | |
032370b9 | 200 | } |
c88d7150 | 201 | |
81c7ed29 KS |
202 | i = physaddr >> PUD_SHIFT; |
203 | pud[(i + 0) % PTRS_PER_PUD] = (pudval_t)pmd + pgtable_flags; | |
204 | pud[(i + 1) % PTRS_PER_PUD] = (pudval_t)pmd + pgtable_flags; | |
c88d7150 KS |
205 | |
206 | pmd_entry = __PAGE_KERNEL_LARGE_EXEC & ~_PAGE_GLOBAL; | |
fb43d6cb | 207 | /* Filter out unsupported __PAGE_KERNEL_* bits: */ |
4a09f021 AP |
208 | mask_ptr = fixup_pointer(&__supported_pte_mask, physaddr); |
209 | pmd_entry &= *mask_ptr; | |
5868f365 | 210 | pmd_entry += sme_get_me_mask(); |
c88d7150 KS |
211 | pmd_entry += physaddr; |
212 | ||
213 | for (i = 0; i < DIV_ROUND_UP(_end - _text, PMD_SIZE); i++) { | |
81c7ed29 KS |
214 | int idx = i + (physaddr >> PMD_SHIFT); |
215 | ||
216 | pmd[idx % PTRS_PER_PMD] = pmd_entry + i * PMD_SIZE; | |
c88d7150 KS |
217 | } |
218 | ||
219 | /* | |
220 | * Fixup the kernel text+data virtual addresses. Note that | |
221 | * we might write invalid pmds, when the kernel is relocated | |
222 | * cleanup_highmap() fixes this up along with the mappings | |
223 | * beyond _end. | |
224 | */ | |
225 | ||
226 | pmd = fixup_pointer(level2_kernel_pgt, physaddr); | |
227 | for (i = 0; i < PTRS_PER_PMD; i++) { | |
228 | if (pmd[i] & _PAGE_PRESENT) | |
229 | pmd[i] += load_delta; | |
230 | } | |
231 | ||
5868f365 TL |
232 | /* |
233 | * Fixup phys_base - remove the memory encryption mask to obtain | |
234 | * the true physical address. | |
235 | */ | |
4fa5662b | 236 | *fixup_long(&phys_base, physaddr) += load_delta - sme_get_me_mask(); |
5868f365 | 237 | |
107cd253 TL |
238 | /* Encrypt the kernel and related (if SME is active) */ |
239 | sme_encrypt_kernel(bp); | |
5868f365 | 240 | |
b3f0907c BS |
241 | /* |
242 | * Clear the memory encryption mask from the .bss..decrypted section. | |
243 | * The bss section will be memset to zero later in the initialization so | |
244 | * there is no need to zero it after changing the memory encryption | |
245 | * attribute. | |
246 | */ | |
247 | if (mem_encrypt_active()) { | |
248 | vaddr = (unsigned long)__start_bss_decrypted; | |
249 | vaddr_end = (unsigned long)__end_bss_decrypted; | |
250 | for (; vaddr < vaddr_end; vaddr += PMD_SIZE) { | |
251 | i = pmd_index(vaddr); | |
252 | pmd[i] -= sme_get_me_mask(); | |
253 | } | |
254 | } | |
255 | ||
5868f365 TL |
256 | /* |
257 | * Return the SME encryption mask (if SME is active) to be used as a | |
258 | * modifier for the initial pgdir entry programmed into CR3. | |
259 | */ | |
260 | return sme_get_me_mask(); | |
261 | } | |
262 | ||
263 | unsigned long __startup_secondary_64(void) | |
264 | { | |
265 | /* | |
266 | * Return the SME encryption mask (if SME is active) to be used as a | |
267 | * modifier for the initial pgdir entry programmed into CR3. | |
268 | */ | |
269 | return sme_get_me_mask(); | |
c88d7150 KS |
270 | } |
271 | ||
8170e6be PA |
272 | /* Wipe all early page tables except for the kernel symbol map */ |
273 | static void __init reset_early_page_tables(void) | |
cfd243d4 | 274 | { |
65ade2f8 | 275 | memset(early_top_pgt, 0, sizeof(pgd_t)*(PTRS_PER_PGD-1)); |
8170e6be | 276 | next_early_pgt = 0; |
21729f81 | 277 | write_cr3(__sme_pa_nodebug(early_top_pgt)); |
8170e6be PA |
278 | } |
279 | ||
280 | /* Create a new PMD entry */ | |
b9d05200 | 281 | int __init __early_make_pgtable(unsigned long address, pmdval_t pmd) |
8170e6be PA |
282 | { |
283 | unsigned long physaddr = address - __PAGE_OFFSET; | |
8170e6be | 284 | pgdval_t pgd, *pgd_p; |
032370b9 | 285 | p4dval_t p4d, *p4d_p; |
6b9c75ac | 286 | pudval_t pud, *pud_p; |
b9d05200 | 287 | pmdval_t *pmd_p; |
8170e6be PA |
288 | |
289 | /* Invalid address or early pgt is done ? */ | |
65ade2f8 | 290 | if (physaddr >= MAXMEM || read_cr3_pa() != __pa_nodebug(early_top_pgt)) |
8170e6be PA |
291 | return -1; |
292 | ||
6b9c75ac | 293 | again: |
65ade2f8 | 294 | pgd_p = &early_top_pgt[pgd_index(address)].pgd; |
8170e6be PA |
295 | pgd = *pgd_p; |
296 | ||
297 | /* | |
298 | * The use of __START_KERNEL_map rather than __PAGE_OFFSET here is | |
299 | * critical -- __PAGE_OFFSET would point us back into the dynamic | |
300 | * range and we might end up looping forever... | |
301 | */ | |
ed7588d5 | 302 | if (!pgtable_l5_enabled()) |
032370b9 KS |
303 | p4d_p = pgd_p; |
304 | else if (pgd) | |
305 | p4d_p = (p4dval_t *)((pgd & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
306 | else { | |
307 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
308 | reset_early_page_tables(); | |
309 | goto again; | |
310 | } | |
311 | ||
312 | p4d_p = (p4dval_t *)early_dynamic_pgts[next_early_pgt++]; | |
313 | memset(p4d_p, 0, sizeof(*p4d_p) * PTRS_PER_P4D); | |
314 | *pgd_p = (pgdval_t)p4d_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; | |
315 | } | |
316 | p4d_p += p4d_index(address); | |
317 | p4d = *p4d_p; | |
318 | ||
319 | if (p4d) | |
320 | pud_p = (pudval_t *)((p4d & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
6b9c75ac YL |
321 | else { |
322 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
8170e6be | 323 | reset_early_page_tables(); |
6b9c75ac YL |
324 | goto again; |
325 | } | |
8170e6be PA |
326 | |
327 | pud_p = (pudval_t *)early_dynamic_pgts[next_early_pgt++]; | |
a91bbe01 | 328 | memset(pud_p, 0, sizeof(*pud_p) * PTRS_PER_PUD); |
032370b9 | 329 | *p4d_p = (p4dval_t)pud_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; |
8170e6be | 330 | } |
6b9c75ac YL |
331 | pud_p += pud_index(address); |
332 | pud = *pud_p; | |
8170e6be | 333 | |
6b9c75ac YL |
334 | if (pud) |
335 | pmd_p = (pmdval_t *)((pud & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
336 | else { | |
337 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
338 | reset_early_page_tables(); | |
339 | goto again; | |
340 | } | |
341 | ||
342 | pmd_p = (pmdval_t *)early_dynamic_pgts[next_early_pgt++]; | |
a91bbe01 | 343 | memset(pmd_p, 0, sizeof(*pmd_p) * PTRS_PER_PMD); |
6b9c75ac YL |
344 | *pud_p = (pudval_t)pmd_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; |
345 | } | |
6b9c75ac | 346 | pmd_p[pmd_index(address)] = pmd; |
8170e6be PA |
347 | |
348 | return 0; | |
cfd243d4 VG |
349 | } |
350 | ||
b9d05200 TL |
351 | int __init early_make_pgtable(unsigned long address) |
352 | { | |
353 | unsigned long physaddr = address - __PAGE_OFFSET; | |
354 | pmdval_t pmd; | |
355 | ||
356 | pmd = (physaddr & PMD_MASK) + early_pmd_flags; | |
357 | ||
358 | return __early_make_pgtable(address, pmd); | |
359 | } | |
360 | ||
1da177e4 LT |
361 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
362 | yet. */ | |
363 | static void __init clear_bss(void) | |
364 | { | |
1da177e4 | 365 | memset(__bss_start, 0, |
2bc0414e | 366 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
1da177e4 LT |
367 | } |
368 | ||
f1da834c YL |
369 | static unsigned long get_cmd_line_ptr(void) |
370 | { | |
371 | unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; | |
372 | ||
ee92d815 YL |
373 | cmd_line_ptr |= (u64)boot_params.ext_cmd_line_ptr << 32; |
374 | ||
f1da834c YL |
375 | return cmd_line_ptr; |
376 | } | |
377 | ||
1da177e4 LT |
378 | static void __init copy_bootdata(char *real_mode_data) |
379 | { | |
1da177e4 | 380 | char * command_line; |
f1da834c | 381 | unsigned long cmd_line_ptr; |
1da177e4 | 382 | |
b9d05200 TL |
383 | /* |
384 | * If SME is active, this will create decrypted mappings of the | |
385 | * boot data in advance of the copy operations. | |
386 | */ | |
387 | sme_map_bootdata(real_mode_data); | |
388 | ||
0e96f31e | 389 | memcpy(&boot_params, real_mode_data, sizeof(boot_params)); |
5dcd14ec | 390 | sanitize_boot_params(&boot_params); |
f1da834c YL |
391 | cmd_line_ptr = get_cmd_line_ptr(); |
392 | if (cmd_line_ptr) { | |
393 | command_line = __va(cmd_line_ptr); | |
30c82645 | 394 | memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
1da177e4 | 395 | } |
b9d05200 TL |
396 | |
397 | /* | |
398 | * The old boot data is no longer needed and won't be reserved, | |
399 | * freeing up that memory for use by the system. If SME is active, | |
400 | * we need to remove the mappings that were created so that the | |
401 | * memory doesn't remain mapped as decrypted. | |
402 | */ | |
403 | sme_unmap_bootdata(real_mode_data); | |
1da177e4 LT |
404 | } |
405 | ||
2605fc21 | 406 | asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data) |
1da177e4 | 407 | { |
b4e0409a IM |
408 | /* |
409 | * Build-time sanity checks on the kernel image and module | |
410 | * area mappings. (these are purely build-time and produce no code) | |
411 | */ | |
8e3c2a8c BP |
412 | BUILD_BUG_ON(MODULES_VADDR < __START_KERNEL_map); |
413 | BUILD_BUG_ON(MODULES_VADDR - __START_KERNEL_map < KERNEL_IMAGE_SIZE); | |
b4e0409a | 414 | BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE); |
8e3c2a8c | 415 | BUILD_BUG_ON((__START_KERNEL_map & ~PMD_MASK) != 0); |
b4e0409a IM |
416 | BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0); |
417 | BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL)); | |
c65e774f | 418 | MAYBE_BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) == |
b4e0409a | 419 | (__START_KERNEL & PGDIR_MASK))); |
66d4bdf2 | 420 | BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END); |
b4e0409a | 421 | |
1e02ce4c AL |
422 | cr4_init_shadow(); |
423 | ||
8170e6be PA |
424 | /* Kill off the identity-map trampoline */ |
425 | reset_early_page_tables(); | |
426 | ||
3df0af0e YL |
427 | clear_bss(); |
428 | ||
65ade2f8 | 429 | clear_page(init_top_pgt); |
d0f77d4d | 430 | |
21729f81 TL |
431 | /* |
432 | * SME support may update early_pmd_flags to include the memory | |
433 | * encryption mask, so it needs to be called before anything | |
434 | * that may generate a page fault. | |
435 | */ | |
436 | sme_early_init(); | |
437 | ||
5d5aa3cf AP |
438 | kasan_early_init(); |
439 | ||
588787fd | 440 | idt_setup_early_handler(); |
f6c2e333 | 441 | |
fa2bbce9 YL |
442 | copy_bootdata(__va(real_mode_data)); |
443 | ||
feddc9de FY |
444 | /* |
445 | * Load microcode early on BSP. | |
446 | */ | |
447 | load_ucode_bsp(); | |
448 | ||
65ade2f8 KS |
449 | /* set init_top_pgt kernel high mapping*/ |
450 | init_top_pgt[511] = early_top_pgt[511]; | |
8170e6be | 451 | |
f97013fd JF |
452 | x86_64_start_reservations(real_mode_data); |
453 | } | |
454 | ||
455 | void __init x86_64_start_reservations(char *real_mode_data) | |
456 | { | |
fa2bbce9 YL |
457 | /* version is always not zero if it is copied */ |
458 | if (!boot_params.hdr.version) | |
459 | copy_bootdata(__va(real_mode_data)); | |
9de819fe | 460 | |
8d152e7a | 461 | x86_early_init_platform_quirks(); |
75175278 | 462 | |
3fda5bb4 AS |
463 | switch (boot_params.hdr.hardware_subarch) { |
464 | case X86_SUBARCH_INTEL_MID: | |
465 | x86_intel_mid_early_setup(); | |
466 | break; | |
467 | default: | |
468 | break; | |
469 | } | |
470 | ||
1da177e4 LT |
471 | start_kernel(); |
472 | } |