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Commit | Line | Data |
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1da177e4 | 1 | /* |
835c34a1 | 2 | * prepare to run common code |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE | |
1da177e4 LT |
5 | */ |
6 | ||
7 | #include <linux/init.h> | |
8 | #include <linux/linkage.h> | |
9 | #include <linux/types.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/string.h> | |
12 | #include <linux/percpu.h> | |
eaf76e8b | 13 | #include <linux/start_kernel.h> |
8b664aa6 | 14 | #include <linux/io.h> |
72d7c3b3 | 15 | #include <linux/memblock.h> |
1da177e4 LT |
16 | |
17 | #include <asm/processor.h> | |
18 | #include <asm/proto.h> | |
19 | #include <asm/smp.h> | |
1da177e4 LT |
20 | #include <asm/setup.h> |
21 | #include <asm/desc.h> | |
f6c2e333 | 22 | #include <asm/pgtable.h> |
cfd243d4 | 23 | #include <asm/tlbflush.h> |
2bc0414e | 24 | #include <asm/sections.h> |
718fc13b | 25 | #include <asm/kdebug.h> |
75175278 | 26 | #include <asm/e820.h> |
47a3d5da | 27 | #include <asm/bios_ebda.h> |
5dcd14ec | 28 | #include <asm/bootparam_utils.h> |
feddc9de | 29 | #include <asm/microcode.h> |
ef7f0d6a | 30 | #include <asm/kasan.h> |
1da177e4 | 31 | |
8170e6be PA |
32 | /* |
33 | * Manage page tables very early on. | |
34 | */ | |
35 | extern pgd_t early_level4_pgt[PTRS_PER_PGD]; | |
36 | extern pmd_t early_dynamic_pgts[EARLY_DYNAMIC_PAGE_TABLES][PTRS_PER_PMD]; | |
37 | static unsigned int __initdata next_early_pgt = 2; | |
5e427ec2 | 38 | pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX); |
8170e6be PA |
39 | |
40 | /* Wipe all early page tables except for the kernel symbol map */ | |
41 | static void __init reset_early_page_tables(void) | |
cfd243d4 | 42 | { |
8170e6be PA |
43 | unsigned long i; |
44 | ||
45 | for (i = 0; i < PTRS_PER_PGD-1; i++) | |
46 | early_level4_pgt[i].pgd = 0; | |
47 | ||
48 | next_early_pgt = 0; | |
49 | ||
ef7f0d6a | 50 | write_cr3(__pa_nodebug(early_level4_pgt)); |
8170e6be PA |
51 | } |
52 | ||
53 | /* Create a new PMD entry */ | |
54 | int __init early_make_pgtable(unsigned long address) | |
55 | { | |
56 | unsigned long physaddr = address - __PAGE_OFFSET; | |
57 | unsigned long i; | |
58 | pgdval_t pgd, *pgd_p; | |
6b9c75ac | 59 | pudval_t pud, *pud_p; |
8170e6be PA |
60 | pmdval_t pmd, *pmd_p; |
61 | ||
62 | /* Invalid address or early pgt is done ? */ | |
ef7f0d6a | 63 | if (physaddr >= MAXMEM || read_cr3() != __pa_nodebug(early_level4_pgt)) |
8170e6be PA |
64 | return -1; |
65 | ||
6b9c75ac YL |
66 | again: |
67 | pgd_p = &early_level4_pgt[pgd_index(address)].pgd; | |
8170e6be PA |
68 | pgd = *pgd_p; |
69 | ||
70 | /* | |
71 | * The use of __START_KERNEL_map rather than __PAGE_OFFSET here is | |
72 | * critical -- __PAGE_OFFSET would point us back into the dynamic | |
73 | * range and we might end up looping forever... | |
74 | */ | |
6b9c75ac | 75 | if (pgd) |
8170e6be | 76 | pud_p = (pudval_t *)((pgd & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); |
6b9c75ac YL |
77 | else { |
78 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
8170e6be | 79 | reset_early_page_tables(); |
6b9c75ac YL |
80 | goto again; |
81 | } | |
8170e6be PA |
82 | |
83 | pud_p = (pudval_t *)early_dynamic_pgts[next_early_pgt++]; | |
84 | for (i = 0; i < PTRS_PER_PUD; i++) | |
85 | pud_p[i] = 0; | |
8170e6be PA |
86 | *pgd_p = (pgdval_t)pud_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; |
87 | } | |
6b9c75ac YL |
88 | pud_p += pud_index(address); |
89 | pud = *pud_p; | |
8170e6be | 90 | |
6b9c75ac YL |
91 | if (pud) |
92 | pmd_p = (pmdval_t *)((pud & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
93 | else { | |
94 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
95 | reset_early_page_tables(); | |
96 | goto again; | |
97 | } | |
98 | ||
99 | pmd_p = (pmdval_t *)early_dynamic_pgts[next_early_pgt++]; | |
100 | for (i = 0; i < PTRS_PER_PMD; i++) | |
101 | pmd_p[i] = 0; | |
102 | *pud_p = (pudval_t)pmd_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; | |
103 | } | |
78d77df7 | 104 | pmd = (physaddr & PMD_MASK) + early_pmd_flags; |
6b9c75ac | 105 | pmd_p[pmd_index(address)] = pmd; |
8170e6be PA |
106 | |
107 | return 0; | |
cfd243d4 VG |
108 | } |
109 | ||
1da177e4 LT |
110 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
111 | yet. */ | |
112 | static void __init clear_bss(void) | |
113 | { | |
1da177e4 | 114 | memset(__bss_start, 0, |
2bc0414e | 115 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
1da177e4 LT |
116 | } |
117 | ||
f1da834c YL |
118 | static unsigned long get_cmd_line_ptr(void) |
119 | { | |
120 | unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; | |
121 | ||
ee92d815 YL |
122 | cmd_line_ptr |= (u64)boot_params.ext_cmd_line_ptr << 32; |
123 | ||
f1da834c YL |
124 | return cmd_line_ptr; |
125 | } | |
126 | ||
1da177e4 LT |
127 | static void __init copy_bootdata(char *real_mode_data) |
128 | { | |
1da177e4 | 129 | char * command_line; |
f1da834c | 130 | unsigned long cmd_line_ptr; |
1da177e4 | 131 | |
30c82645 | 132 | memcpy(&boot_params, real_mode_data, sizeof boot_params); |
5dcd14ec | 133 | sanitize_boot_params(&boot_params); |
f1da834c YL |
134 | cmd_line_ptr = get_cmd_line_ptr(); |
135 | if (cmd_line_ptr) { | |
136 | command_line = __va(cmd_line_ptr); | |
30c82645 | 137 | memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
1da177e4 | 138 | } |
1da177e4 LT |
139 | } |
140 | ||
2605fc21 | 141 | asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data) |
1da177e4 | 142 | { |
1da177e4 LT |
143 | int i; |
144 | ||
b4e0409a IM |
145 | /* |
146 | * Build-time sanity checks on the kernel image and module | |
147 | * area mappings. (these are purely build-time and produce no code) | |
148 | */ | |
8e3c2a8c BP |
149 | BUILD_BUG_ON(MODULES_VADDR < __START_KERNEL_map); |
150 | BUILD_BUG_ON(MODULES_VADDR - __START_KERNEL_map < KERNEL_IMAGE_SIZE); | |
b4e0409a | 151 | BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE); |
8e3c2a8c | 152 | BUILD_BUG_ON((__START_KERNEL_map & ~PMD_MASK) != 0); |
b4e0409a IM |
153 | BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0); |
154 | BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL)); | |
155 | BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) == | |
156 | (__START_KERNEL & PGDIR_MASK))); | |
66d4bdf2 | 157 | BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END); |
b4e0409a | 158 | |
1e02ce4c AL |
159 | cr4_init_shadow(); |
160 | ||
8170e6be PA |
161 | /* Kill off the identity-map trampoline */ |
162 | reset_early_page_tables(); | |
163 | ||
3df0af0e YL |
164 | clear_bss(); |
165 | ||
d0f77d4d AR |
166 | clear_page(init_level4_pgt); |
167 | ||
5d5aa3cf AP |
168 | kasan_early_init(); |
169 | ||
ac630dd9 | 170 | for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) |
425be567 | 171 | set_intr_gate(i, early_idt_handler_array[i]); |
9d1c6e7c | 172 | load_idt((const struct desc_ptr *)&idt_descr); |
f6c2e333 | 173 | |
fa2bbce9 YL |
174 | copy_bootdata(__va(real_mode_data)); |
175 | ||
feddc9de FY |
176 | /* |
177 | * Load microcode early on BSP. | |
178 | */ | |
179 | load_ucode_bsp(); | |
180 | ||
8170e6be PA |
181 | /* set init_level4_pgt kernel high mapping*/ |
182 | init_level4_pgt[511] = early_level4_pgt[511]; | |
183 | ||
f97013fd JF |
184 | x86_64_start_reservations(real_mode_data); |
185 | } | |
186 | ||
187 | void __init x86_64_start_reservations(char *real_mode_data) | |
188 | { | |
fa2bbce9 YL |
189 | /* version is always not zero if it is copied */ |
190 | if (!boot_params.hdr.version) | |
191 | copy_bootdata(__va(real_mode_data)); | |
9de819fe | 192 | |
47a3d5da | 193 | reserve_ebda_region(); |
75175278 | 194 | |
1da177e4 LT |
195 | start_kernel(); |
196 | } |