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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> |
65fddcfc | 23 | #include <linux/pgtable.h> |
1da177e4 LT |
24 | |
25 | #include <asm/processor.h> | |
26 | #include <asm/proto.h> | |
27 | #include <asm/smp.h> | |
1da177e4 LT |
28 | #include <asm/setup.h> |
29 | #include <asm/desc.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> |
f5963ba7 | 39 | #include <asm/realmode.h> |
4b47cdbd JR |
40 | #include <asm/extable.h> |
41 | #include <asm/trapnr.h> | |
e759959f | 42 | #include <asm/sev.h> |
1da177e4 | 43 | |
8170e6be PA |
44 | /* |
45 | * Manage page tables very early on. | |
46 | */ | |
8170e6be | 47 | extern pmd_t early_dynamic_pgts[EARLY_DYNAMIC_PAGE_TABLES][PTRS_PER_PMD]; |
c88d7150 | 48 | static unsigned int __initdata next_early_pgt; |
5e427ec2 | 49 | pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX); |
8170e6be | 50 | |
e626e6bb | 51 | #ifdef CONFIG_X86_5LEVEL |
51be1335 | 52 | unsigned int __pgtable_l5_enabled __ro_after_init; |
b16e770b | 53 | unsigned int pgdir_shift __ro_after_init = 39; |
c65e774f | 54 | EXPORT_SYMBOL(pgdir_shift); |
b16e770b | 55 | unsigned int ptrs_per_p4d __ro_after_init = 1; |
c65e774f | 56 | EXPORT_SYMBOL(ptrs_per_p4d); |
e626e6bb KS |
57 | #endif |
58 | ||
eedb92ab | 59 | #ifdef CONFIG_DYNAMIC_MEMORY_LAYOUT |
4fa5662b | 60 | unsigned long page_offset_base __ro_after_init = __PAGE_OFFSET_BASE_L4; |
eedb92ab | 61 | EXPORT_SYMBOL(page_offset_base); |
a7412546 | 62 | unsigned long vmalloc_base __ro_after_init = __VMALLOC_BASE_L4; |
eedb92ab | 63 | EXPORT_SYMBOL(vmalloc_base); |
9b46a051 | 64 | unsigned long vmemmap_base __ro_after_init = __VMEMMAP_BASE_L4; |
eedb92ab KS |
65 | EXPORT_SYMBOL(vmemmap_base); |
66 | #endif | |
67 | ||
866b556e JR |
68 | /* |
69 | * GDT used on the boot CPU before switching to virtual addresses. | |
70 | */ | |
71 | static struct desc_struct startup_gdt[GDT_ENTRIES] = { | |
72 | [GDT_ENTRY_KERNEL32_CS] = GDT_ENTRY_INIT(0xc09b, 0, 0xfffff), | |
73 | [GDT_ENTRY_KERNEL_CS] = GDT_ENTRY_INIT(0xa09b, 0, 0xfffff), | |
74 | [GDT_ENTRY_KERNEL_DS] = GDT_ENTRY_INIT(0xc093, 0, 0xfffff), | |
75 | }; | |
76 | ||
77 | /* | |
78 | * Address needs to be set at runtime because it references the startup_gdt | |
79 | * while the kernel still uses a direct mapping. | |
80 | */ | |
81 | static struct desc_ptr startup_gdt_descr = { | |
82 | .size = sizeof(startup_gdt), | |
83 | .address = 0, | |
84 | }; | |
85 | ||
33def849 | 86 | #define __head __section(".head.text") |
26179670 KS |
87 | |
88 | static void __head *fixup_pointer(void *ptr, unsigned long physaddr) | |
c88d7150 KS |
89 | { |
90 | return ptr - (void *)_text + (void *)physaddr; | |
91 | } | |
92 | ||
4fa5662b KS |
93 | static unsigned long __head *fixup_long(void *ptr, unsigned long physaddr) |
94 | { | |
95 | return fixup_pointer(ptr, physaddr); | |
96 | } | |
97 | ||
4c2b4058 KS |
98 | #ifdef CONFIG_X86_5LEVEL |
99 | static unsigned int __head *fixup_int(void *ptr, unsigned long physaddr) | |
100 | { | |
101 | return fixup_pointer(ptr, physaddr); | |
102 | } | |
103 | ||
6f9dd329 | 104 | static bool __head check_la57_support(unsigned long physaddr) |
4c2b4058 | 105 | { |
372fddf7 | 106 | /* |
d9f6e12f | 107 | * 5-level paging is detected and enabled at kernel decompression |
372fddf7 KS |
108 | * stage. Only check if it has been enabled there. |
109 | */ | |
110 | if (!(native_read_cr4() & X86_CR4_LA57)) | |
6f9dd329 | 111 | return false; |
4c2b4058 | 112 | |
ad3fe525 | 113 | *fixup_int(&__pgtable_l5_enabled, physaddr) = 1; |
b16e770b KS |
114 | *fixup_int(&pgdir_shift, physaddr) = 48; |
115 | *fixup_int(&ptrs_per_p4d, physaddr) = 512; | |
4fa5662b | 116 | *fixup_long(&page_offset_base, physaddr) = __PAGE_OFFSET_BASE_L5; |
a7412546 | 117 | *fixup_long(&vmalloc_base, physaddr) = __VMALLOC_BASE_L5; |
9b46a051 | 118 | *fixup_long(&vmemmap_base, physaddr) = __VMEMMAP_BASE_L5; |
6f9dd329 KS |
119 | |
120 | return true; | |
4c2b4058 KS |
121 | } |
122 | #else | |
6f9dd329 KS |
123 | static bool __head check_la57_support(unsigned long physaddr) |
124 | { | |
125 | return false; | |
126 | } | |
4c2b4058 KS |
127 | #endif |
128 | ||
4a09f021 AP |
129 | /* Code in __startup_64() can be relocated during execution, but the compiler |
130 | * doesn't have to generate PC-relative relocations when accessing globals from | |
131 | * that function. Clang actually does not generate them, which leads to | |
132 | * boot-time crashes. To work around this problem, every global pointer must | |
133 | * be adjusted using fixup_pointer(). | |
134 | */ | |
aca20d54 TL |
135 | unsigned long __head __startup_64(unsigned long physaddr, |
136 | struct boot_params *bp) | |
c88d7150 | 137 | { |
b3f0907c | 138 | unsigned long vaddr, vaddr_end; |
6f9dd329 | 139 | unsigned long load_delta, *p; |
5868f365 | 140 | unsigned long pgtable_flags; |
c88d7150 | 141 | pgdval_t *pgd; |
032370b9 | 142 | p4dval_t *p4d; |
c88d7150 KS |
143 | pudval_t *pud; |
144 | pmdval_t *pmd, pmd_entry; | |
4a09f021 | 145 | pteval_t *mask_ptr; |
6f9dd329 | 146 | bool la57; |
c88d7150 | 147 | int i; |
187e91fe | 148 | unsigned int *next_pgt_ptr; |
c88d7150 | 149 | |
6f9dd329 | 150 | la57 = check_la57_support(physaddr); |
4c2b4058 | 151 | |
c88d7150 KS |
152 | /* Is the address too large? */ |
153 | if (physaddr >> MAX_PHYSMEM_BITS) | |
154 | for (;;); | |
155 | ||
156 | /* | |
157 | * Compute the delta between the address I am compiled to run at | |
158 | * and the address I am actually running at. | |
159 | */ | |
160 | load_delta = physaddr - (unsigned long)(_text - __START_KERNEL_map); | |
161 | ||
162 | /* Is the address not 2M aligned? */ | |
163 | if (load_delta & ~PMD_PAGE_MASK) | |
164 | for (;;); | |
165 | ||
5868f365 | 166 | /* Activate Secure Memory Encryption (SME) if supported and enabled */ |
aca20d54 | 167 | sme_enable(bp); |
5868f365 TL |
168 | |
169 | /* Include the SME encryption mask in the fixup value */ | |
170 | load_delta += sme_get_me_mask(); | |
171 | ||
c88d7150 KS |
172 | /* Fixup the physical addresses in the page table */ |
173 | ||
65ade2f8 | 174 | pgd = fixup_pointer(&early_top_pgt, physaddr); |
6f9dd329 KS |
175 | p = pgd + pgd_index(__START_KERNEL_map); |
176 | if (la57) | |
177 | *p = (unsigned long)level4_kernel_pgt; | |
178 | else | |
179 | *p = (unsigned long)level3_kernel_pgt; | |
180 | *p += _PAGE_TABLE_NOENC - __START_KERNEL_map + load_delta; | |
181 | ||
182 | if (la57) { | |
032370b9 KS |
183 | p4d = fixup_pointer(&level4_kernel_pgt, physaddr); |
184 | p4d[511] += load_delta; | |
185 | } | |
186 | ||
c88d7150 KS |
187 | pud = fixup_pointer(&level3_kernel_pgt, physaddr); |
188 | pud[510] += load_delta; | |
189 | pud[511] += load_delta; | |
190 | ||
191 | pmd = fixup_pointer(level2_fixmap_pgt, physaddr); | |
05ab1d8a FT |
192 | for (i = FIXMAP_PMD_TOP; i > FIXMAP_PMD_TOP - FIXMAP_PMD_NUM; i--) |
193 | pmd[i] += load_delta; | |
c88d7150 KS |
194 | |
195 | /* | |
196 | * Set up the identity mapping for the switchover. These | |
197 | * entries should *NOT* have the global bit set! This also | |
198 | * creates a bunch of nonsense entries but that is fine -- | |
199 | * it avoids problems around wraparound. | |
200 | */ | |
201 | ||
187e91fe AP |
202 | next_pgt_ptr = fixup_pointer(&next_early_pgt, physaddr); |
203 | pud = fixup_pointer(early_dynamic_pgts[(*next_pgt_ptr)++], physaddr); | |
204 | pmd = fixup_pointer(early_dynamic_pgts[(*next_pgt_ptr)++], physaddr); | |
c88d7150 | 205 | |
21729f81 | 206 | pgtable_flags = _KERNPG_TABLE_NOENC + sme_get_me_mask(); |
c88d7150 | 207 | |
6f9dd329 | 208 | if (la57) { |
c1887159 KS |
209 | p4d = fixup_pointer(early_dynamic_pgts[(*next_pgt_ptr)++], |
210 | physaddr); | |
032370b9 KS |
211 | |
212 | i = (physaddr >> PGDIR_SHIFT) % PTRS_PER_PGD; | |
5868f365 TL |
213 | pgd[i + 0] = (pgdval_t)p4d + pgtable_flags; |
214 | pgd[i + 1] = (pgdval_t)p4d + pgtable_flags; | |
032370b9 | 215 | |
81c7ed29 KS |
216 | i = physaddr >> P4D_SHIFT; |
217 | p4d[(i + 0) % PTRS_PER_P4D] = (pgdval_t)pud + pgtable_flags; | |
218 | p4d[(i + 1) % PTRS_PER_P4D] = (pgdval_t)pud + pgtable_flags; | |
032370b9 KS |
219 | } else { |
220 | i = (physaddr >> PGDIR_SHIFT) % PTRS_PER_PGD; | |
5868f365 TL |
221 | pgd[i + 0] = (pgdval_t)pud + pgtable_flags; |
222 | pgd[i + 1] = (pgdval_t)pud + pgtable_flags; | |
032370b9 | 223 | } |
c88d7150 | 224 | |
81c7ed29 KS |
225 | i = physaddr >> PUD_SHIFT; |
226 | pud[(i + 0) % PTRS_PER_PUD] = (pudval_t)pmd + pgtable_flags; | |
227 | pud[(i + 1) % PTRS_PER_PUD] = (pudval_t)pmd + pgtable_flags; | |
c88d7150 KS |
228 | |
229 | pmd_entry = __PAGE_KERNEL_LARGE_EXEC & ~_PAGE_GLOBAL; | |
fb43d6cb | 230 | /* Filter out unsupported __PAGE_KERNEL_* bits: */ |
4a09f021 AP |
231 | mask_ptr = fixup_pointer(&__supported_pte_mask, physaddr); |
232 | pmd_entry &= *mask_ptr; | |
5868f365 | 233 | pmd_entry += sme_get_me_mask(); |
c88d7150 KS |
234 | pmd_entry += physaddr; |
235 | ||
236 | for (i = 0; i < DIV_ROUND_UP(_end - _text, PMD_SIZE); i++) { | |
81c7ed29 KS |
237 | int idx = i + (physaddr >> PMD_SHIFT); |
238 | ||
239 | pmd[idx % PTRS_PER_PMD] = pmd_entry + i * PMD_SIZE; | |
c88d7150 KS |
240 | } |
241 | ||
242 | /* | |
243 | * Fixup the kernel text+data virtual addresses. Note that | |
244 | * we might write invalid pmds, when the kernel is relocated | |
245 | * cleanup_highmap() fixes this up along with the mappings | |
246 | * beyond _end. | |
2aa85f24 SW |
247 | * |
248 | * Only the region occupied by the kernel image has so far | |
249 | * been checked against the table of usable memory regions | |
250 | * provided by the firmware, so invalidate pages outside that | |
251 | * region. A page table entry that maps to a reserved area of | |
252 | * memory would allow processor speculation into that area, | |
253 | * and on some hardware (particularly the UV platform) even | |
254 | * speculative access to some reserved areas is caught as an | |
255 | * error, causing the BIOS to halt the system. | |
c88d7150 KS |
256 | */ |
257 | ||
258 | pmd = fixup_pointer(level2_kernel_pgt, physaddr); | |
2aa85f24 SW |
259 | |
260 | /* invalidate pages before the kernel image */ | |
261 | for (i = 0; i < pmd_index((unsigned long)_text); i++) | |
262 | pmd[i] &= ~_PAGE_PRESENT; | |
263 | ||
264 | /* fixup pages that are part of the kernel image */ | |
265 | for (; i <= pmd_index((unsigned long)_end); i++) | |
c88d7150 KS |
266 | if (pmd[i] & _PAGE_PRESENT) |
267 | pmd[i] += load_delta; | |
2aa85f24 SW |
268 | |
269 | /* invalidate pages after the kernel image */ | |
270 | for (; i < PTRS_PER_PMD; i++) | |
271 | pmd[i] &= ~_PAGE_PRESENT; | |
c88d7150 | 272 | |
5868f365 TL |
273 | /* |
274 | * Fixup phys_base - remove the memory encryption mask to obtain | |
275 | * the true physical address. | |
276 | */ | |
4fa5662b | 277 | *fixup_long(&phys_base, physaddr) += load_delta - sme_get_me_mask(); |
5868f365 | 278 | |
107cd253 TL |
279 | /* Encrypt the kernel and related (if SME is active) */ |
280 | sme_encrypt_kernel(bp); | |
5868f365 | 281 | |
b3f0907c BS |
282 | /* |
283 | * Clear the memory encryption mask from the .bss..decrypted section. | |
284 | * The bss section will be memset to zero later in the initialization so | |
285 | * there is no need to zero it after changing the memory encryption | |
286 | * attribute. | |
287 | */ | |
288 | if (mem_encrypt_active()) { | |
289 | vaddr = (unsigned long)__start_bss_decrypted; | |
290 | vaddr_end = (unsigned long)__end_bss_decrypted; | |
291 | for (; vaddr < vaddr_end; vaddr += PMD_SIZE) { | |
292 | i = pmd_index(vaddr); | |
293 | pmd[i] -= sme_get_me_mask(); | |
294 | } | |
295 | } | |
296 | ||
5868f365 TL |
297 | /* |
298 | * Return the SME encryption mask (if SME is active) to be used as a | |
299 | * modifier for the initial pgdir entry programmed into CR3. | |
300 | */ | |
301 | return sme_get_me_mask(); | |
302 | } | |
303 | ||
304 | unsigned long __startup_secondary_64(void) | |
305 | { | |
306 | /* | |
307 | * Return the SME encryption mask (if SME is active) to be used as a | |
308 | * modifier for the initial pgdir entry programmed into CR3. | |
309 | */ | |
310 | return sme_get_me_mask(); | |
c88d7150 KS |
311 | } |
312 | ||
8170e6be PA |
313 | /* Wipe all early page tables except for the kernel symbol map */ |
314 | static void __init reset_early_page_tables(void) | |
cfd243d4 | 315 | { |
65ade2f8 | 316 | memset(early_top_pgt, 0, sizeof(pgd_t)*(PTRS_PER_PGD-1)); |
8170e6be | 317 | next_early_pgt = 0; |
21729f81 | 318 | write_cr3(__sme_pa_nodebug(early_top_pgt)); |
8170e6be PA |
319 | } |
320 | ||
321 | /* Create a new PMD entry */ | |
4b47cdbd | 322 | bool __init __early_make_pgtable(unsigned long address, pmdval_t pmd) |
8170e6be PA |
323 | { |
324 | unsigned long physaddr = address - __PAGE_OFFSET; | |
8170e6be | 325 | pgdval_t pgd, *pgd_p; |
032370b9 | 326 | p4dval_t p4d, *p4d_p; |
6b9c75ac | 327 | pudval_t pud, *pud_p; |
b9d05200 | 328 | pmdval_t *pmd_p; |
8170e6be PA |
329 | |
330 | /* Invalid address or early pgt is done ? */ | |
65ade2f8 | 331 | if (physaddr >= MAXMEM || read_cr3_pa() != __pa_nodebug(early_top_pgt)) |
4b47cdbd | 332 | return false; |
8170e6be | 333 | |
6b9c75ac | 334 | again: |
65ade2f8 | 335 | pgd_p = &early_top_pgt[pgd_index(address)].pgd; |
8170e6be PA |
336 | pgd = *pgd_p; |
337 | ||
338 | /* | |
339 | * The use of __START_KERNEL_map rather than __PAGE_OFFSET here is | |
340 | * critical -- __PAGE_OFFSET would point us back into the dynamic | |
341 | * range and we might end up looping forever... | |
342 | */ | |
ed7588d5 | 343 | if (!pgtable_l5_enabled()) |
032370b9 KS |
344 | p4d_p = pgd_p; |
345 | else if (pgd) | |
346 | p4d_p = (p4dval_t *)((pgd & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
347 | else { | |
348 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
349 | reset_early_page_tables(); | |
350 | goto again; | |
351 | } | |
352 | ||
353 | p4d_p = (p4dval_t *)early_dynamic_pgts[next_early_pgt++]; | |
354 | memset(p4d_p, 0, sizeof(*p4d_p) * PTRS_PER_P4D); | |
355 | *pgd_p = (pgdval_t)p4d_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; | |
356 | } | |
357 | p4d_p += p4d_index(address); | |
358 | p4d = *p4d_p; | |
359 | ||
360 | if (p4d) | |
361 | pud_p = (pudval_t *)((p4d & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
6b9c75ac YL |
362 | else { |
363 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
8170e6be | 364 | reset_early_page_tables(); |
6b9c75ac YL |
365 | goto again; |
366 | } | |
8170e6be PA |
367 | |
368 | pud_p = (pudval_t *)early_dynamic_pgts[next_early_pgt++]; | |
a91bbe01 | 369 | memset(pud_p, 0, sizeof(*pud_p) * PTRS_PER_PUD); |
032370b9 | 370 | *p4d_p = (p4dval_t)pud_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; |
8170e6be | 371 | } |
6b9c75ac YL |
372 | pud_p += pud_index(address); |
373 | pud = *pud_p; | |
8170e6be | 374 | |
6b9c75ac YL |
375 | if (pud) |
376 | pmd_p = (pmdval_t *)((pud & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
377 | else { | |
378 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
379 | reset_early_page_tables(); | |
380 | goto again; | |
381 | } | |
382 | ||
383 | pmd_p = (pmdval_t *)early_dynamic_pgts[next_early_pgt++]; | |
a91bbe01 | 384 | memset(pmd_p, 0, sizeof(*pmd_p) * PTRS_PER_PMD); |
6b9c75ac YL |
385 | *pud_p = (pudval_t)pmd_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; |
386 | } | |
6b9c75ac | 387 | pmd_p[pmd_index(address)] = pmd; |
8170e6be | 388 | |
4b47cdbd | 389 | return true; |
cfd243d4 VG |
390 | } |
391 | ||
4b47cdbd | 392 | static bool __init early_make_pgtable(unsigned long address) |
b9d05200 TL |
393 | { |
394 | unsigned long physaddr = address - __PAGE_OFFSET; | |
395 | pmdval_t pmd; | |
396 | ||
397 | pmd = (physaddr & PMD_MASK) + early_pmd_flags; | |
398 | ||
399 | return __early_make_pgtable(address, pmd); | |
400 | } | |
401 | ||
4b47cdbd JR |
402 | void __init do_early_exception(struct pt_regs *regs, int trapnr) |
403 | { | |
404 | if (trapnr == X86_TRAP_PF && | |
405 | early_make_pgtable(native_read_cr2())) | |
406 | return; | |
407 | ||
1aa9aa8e JR |
408 | if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT) && |
409 | trapnr == X86_TRAP_VC && handle_vc_boot_ghcb(regs)) | |
410 | return; | |
411 | ||
4b47cdbd JR |
412 | early_fixup_exception(regs, trapnr); |
413 | } | |
414 | ||
1da177e4 LT |
415 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
416 | yet. */ | |
417 | static void __init clear_bss(void) | |
418 | { | |
1da177e4 | 419 | memset(__bss_start, 0, |
2bc0414e | 420 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
1da177e4 LT |
421 | } |
422 | ||
f1da834c YL |
423 | static unsigned long get_cmd_line_ptr(void) |
424 | { | |
425 | unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; | |
426 | ||
ee92d815 YL |
427 | cmd_line_ptr |= (u64)boot_params.ext_cmd_line_ptr << 32; |
428 | ||
f1da834c YL |
429 | return cmd_line_ptr; |
430 | } | |
431 | ||
1da177e4 LT |
432 | static void __init copy_bootdata(char *real_mode_data) |
433 | { | |
1da177e4 | 434 | char * command_line; |
f1da834c | 435 | unsigned long cmd_line_ptr; |
1da177e4 | 436 | |
b9d05200 TL |
437 | /* |
438 | * If SME is active, this will create decrypted mappings of the | |
439 | * boot data in advance of the copy operations. | |
440 | */ | |
441 | sme_map_bootdata(real_mode_data); | |
442 | ||
0e96f31e | 443 | memcpy(&boot_params, real_mode_data, sizeof(boot_params)); |
5dcd14ec | 444 | sanitize_boot_params(&boot_params); |
f1da834c YL |
445 | cmd_line_ptr = get_cmd_line_ptr(); |
446 | if (cmd_line_ptr) { | |
447 | command_line = __va(cmd_line_ptr); | |
30c82645 | 448 | memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
1da177e4 | 449 | } |
b9d05200 TL |
450 | |
451 | /* | |
452 | * The old boot data is no longer needed and won't be reserved, | |
453 | * freeing up that memory for use by the system. If SME is active, | |
454 | * we need to remove the mappings that were created so that the | |
455 | * memory doesn't remain mapped as decrypted. | |
456 | */ | |
457 | sme_unmap_bootdata(real_mode_data); | |
1da177e4 LT |
458 | } |
459 | ||
2605fc21 | 460 | asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data) |
1da177e4 | 461 | { |
b4e0409a IM |
462 | /* |
463 | * Build-time sanity checks on the kernel image and module | |
464 | * area mappings. (these are purely build-time and produce no code) | |
465 | */ | |
8e3c2a8c BP |
466 | BUILD_BUG_ON(MODULES_VADDR < __START_KERNEL_map); |
467 | BUILD_BUG_ON(MODULES_VADDR - __START_KERNEL_map < KERNEL_IMAGE_SIZE); | |
b4e0409a | 468 | BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE); |
8e3c2a8c | 469 | BUILD_BUG_ON((__START_KERNEL_map & ~PMD_MASK) != 0); |
b4e0409a IM |
470 | BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0); |
471 | BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL)); | |
c65e774f | 472 | MAYBE_BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) == |
b4e0409a | 473 | (__START_KERNEL & PGDIR_MASK))); |
66d4bdf2 | 474 | BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END); |
b4e0409a | 475 | |
1e02ce4c AL |
476 | cr4_init_shadow(); |
477 | ||
8170e6be PA |
478 | /* Kill off the identity-map trampoline */ |
479 | reset_early_page_tables(); | |
480 | ||
3df0af0e YL |
481 | clear_bss(); |
482 | ||
65ade2f8 | 483 | clear_page(init_top_pgt); |
d0f77d4d | 484 | |
21729f81 TL |
485 | /* |
486 | * SME support may update early_pmd_flags to include the memory | |
487 | * encryption mask, so it needs to be called before anything | |
488 | * that may generate a page fault. | |
489 | */ | |
490 | sme_early_init(); | |
491 | ||
5d5aa3cf AP |
492 | kasan_early_init(); |
493 | ||
588787fd | 494 | idt_setup_early_handler(); |
f6c2e333 | 495 | |
fa2bbce9 YL |
496 | copy_bootdata(__va(real_mode_data)); |
497 | ||
feddc9de FY |
498 | /* |
499 | * Load microcode early on BSP. | |
500 | */ | |
501 | load_ucode_bsp(); | |
502 | ||
65ade2f8 KS |
503 | /* set init_top_pgt kernel high mapping*/ |
504 | init_top_pgt[511] = early_top_pgt[511]; | |
8170e6be | 505 | |
f97013fd JF |
506 | x86_64_start_reservations(real_mode_data); |
507 | } | |
508 | ||
509 | void __init x86_64_start_reservations(char *real_mode_data) | |
510 | { | |
fa2bbce9 YL |
511 | /* version is always not zero if it is copied */ |
512 | if (!boot_params.hdr.version) | |
513 | copy_bootdata(__va(real_mode_data)); | |
9de819fe | 514 | |
8d152e7a | 515 | x86_early_init_platform_quirks(); |
75175278 | 516 | |
3fda5bb4 AS |
517 | switch (boot_params.hdr.hardware_subarch) { |
518 | case X86_SUBARCH_INTEL_MID: | |
519 | x86_intel_mid_early_setup(); | |
520 | break; | |
521 | default: | |
522 | break; | |
523 | } | |
524 | ||
1da177e4 LT |
525 | start_kernel(); |
526 | } | |
866b556e | 527 | |
f5963ba7 JR |
528 | /* |
529 | * Data structures and code used for IDT setup in head_64.S. The bringup-IDT is | |
530 | * used until the idt_table takes over. On the boot CPU this happens in | |
531 | * x86_64_start_kernel(), on secondary CPUs in start_secondary(). In both cases | |
532 | * this happens in the functions called from head_64.S. | |
533 | * | |
534 | * The idt_table can't be used that early because all the code modifying it is | |
535 | * in idt.c and can be instrumented by tracing or KASAN, which both don't work | |
536 | * during early CPU bringup. Also the idt_table has the runtime vectors | |
537 | * configured which require certain CPU state to be setup already (like TSS), | |
538 | * which also hasn't happened yet in early CPU bringup. | |
539 | */ | |
540 | static gate_desc bringup_idt_table[NUM_EXCEPTION_VECTORS] __page_aligned_data; | |
541 | ||
542 | static struct desc_ptr bringup_idt_descr = { | |
543 | .size = (NUM_EXCEPTION_VECTORS * sizeof(gate_desc)) - 1, | |
544 | .address = 0, /* Set at runtime */ | |
545 | }; | |
546 | ||
74d8d9d5 JR |
547 | static void set_bringup_idt_handler(gate_desc *idt, int n, void *handler) |
548 | { | |
549 | #ifdef CONFIG_AMD_MEM_ENCRYPT | |
550 | struct idt_data data; | |
551 | gate_desc desc; | |
552 | ||
553 | init_idt_data(&data, n, handler); | |
554 | idt_init_desc(&desc, &data); | |
555 | native_write_idt_entry(idt, n, &desc); | |
556 | #endif | |
557 | } | |
558 | ||
f5963ba7 JR |
559 | /* This runs while still in the direct mapping */ |
560 | static void startup_64_load_idt(unsigned long physbase) | |
561 | { | |
562 | struct desc_ptr *desc = fixup_pointer(&bringup_idt_descr, physbase); | |
74d8d9d5 JR |
563 | gate_desc *idt = fixup_pointer(bringup_idt_table, physbase); |
564 | ||
565 | ||
566 | if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) { | |
567 | void *handler; | |
568 | ||
569 | /* VMM Communication Exception */ | |
570 | handler = fixup_pointer(vc_no_ghcb, physbase); | |
571 | set_bringup_idt_handler(idt, X86_TRAP_VC, handler); | |
572 | } | |
f5963ba7 | 573 | |
74d8d9d5 | 574 | desc->address = (unsigned long)idt; |
f5963ba7 JR |
575 | native_load_idt(desc); |
576 | } | |
577 | ||
578 | /* This is used when running on kernel addresses */ | |
579 | void early_setup_idt(void) | |
580 | { | |
1aa9aa8e JR |
581 | /* VMM Communication Exception */ |
582 | if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) | |
583 | set_bringup_idt_handler(bringup_idt_table, X86_TRAP_VC, vc_boot_ghcb); | |
584 | ||
f5963ba7 JR |
585 | bringup_idt_descr.address = (unsigned long)bringup_idt_table; |
586 | native_load_idt(&bringup_idt_descr); | |
587 | } | |
588 | ||
866b556e JR |
589 | /* |
590 | * Setup boot CPU state needed before kernel switches to virtual addresses. | |
591 | */ | |
592 | void __head startup_64_setup_env(unsigned long physbase) | |
593 | { | |
594 | /* Load GDT */ | |
595 | startup_gdt_descr.address = (unsigned long)fixup_pointer(startup_gdt, physbase); | |
596 | native_load_gdt(&startup_gdt_descr); | |
597 | ||
598 | /* New GDT is live - reload data segment registers */ | |
599 | asm volatile("movl %%eax, %%ds\n" | |
600 | "movl %%eax, %%ss\n" | |
601 | "movl %%eax, %%es\n" : : "a"(__KERNEL_DS) : "memory"); | |
f5963ba7 JR |
602 | |
603 | startup_64_load_idt(physbase); | |
866b556e | 604 | } |