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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> |
1da177e4 | 30 | |
8170e6be PA |
31 | /* |
32 | * Manage page tables very early on. | |
33 | */ | |
34 | extern pgd_t early_level4_pgt[PTRS_PER_PGD]; | |
35 | extern pmd_t early_dynamic_pgts[EARLY_DYNAMIC_PAGE_TABLES][PTRS_PER_PMD]; | |
36 | static unsigned int __initdata next_early_pgt = 2; | |
5e427ec2 | 37 | pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX); |
8170e6be PA |
38 | |
39 | /* Wipe all early page tables except for the kernel symbol map */ | |
40 | static void __init reset_early_page_tables(void) | |
cfd243d4 | 41 | { |
8170e6be PA |
42 | unsigned long i; |
43 | ||
44 | for (i = 0; i < PTRS_PER_PGD-1; i++) | |
45 | early_level4_pgt[i].pgd = 0; | |
46 | ||
47 | next_early_pgt = 0; | |
48 | ||
49 | write_cr3(__pa(early_level4_pgt)); | |
50 | } | |
51 | ||
52 | /* Create a new PMD entry */ | |
53 | int __init early_make_pgtable(unsigned long address) | |
54 | { | |
55 | unsigned long physaddr = address - __PAGE_OFFSET; | |
56 | unsigned long i; | |
57 | pgdval_t pgd, *pgd_p; | |
6b9c75ac | 58 | pudval_t pud, *pud_p; |
8170e6be PA |
59 | pmdval_t pmd, *pmd_p; |
60 | ||
61 | /* Invalid address or early pgt is done ? */ | |
62 | if (physaddr >= MAXMEM || read_cr3() != __pa(early_level4_pgt)) | |
63 | return -1; | |
64 | ||
6b9c75ac YL |
65 | again: |
66 | pgd_p = &early_level4_pgt[pgd_index(address)].pgd; | |
8170e6be PA |
67 | pgd = *pgd_p; |
68 | ||
69 | /* | |
70 | * The use of __START_KERNEL_map rather than __PAGE_OFFSET here is | |
71 | * critical -- __PAGE_OFFSET would point us back into the dynamic | |
72 | * range and we might end up looping forever... | |
73 | */ | |
6b9c75ac | 74 | if (pgd) |
8170e6be | 75 | pud_p = (pudval_t *)((pgd & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); |
6b9c75ac YL |
76 | else { |
77 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
8170e6be | 78 | reset_early_page_tables(); |
6b9c75ac YL |
79 | goto again; |
80 | } | |
8170e6be PA |
81 | |
82 | pud_p = (pudval_t *)early_dynamic_pgts[next_early_pgt++]; | |
83 | for (i = 0; i < PTRS_PER_PUD; i++) | |
84 | pud_p[i] = 0; | |
8170e6be PA |
85 | *pgd_p = (pgdval_t)pud_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; |
86 | } | |
6b9c75ac YL |
87 | pud_p += pud_index(address); |
88 | pud = *pud_p; | |
8170e6be | 89 | |
6b9c75ac YL |
90 | if (pud) |
91 | pmd_p = (pmdval_t *)((pud & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
92 | else { | |
93 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
94 | reset_early_page_tables(); | |
95 | goto again; | |
96 | } | |
97 | ||
98 | pmd_p = (pmdval_t *)early_dynamic_pgts[next_early_pgt++]; | |
99 | for (i = 0; i < PTRS_PER_PMD; i++) | |
100 | pmd_p[i] = 0; | |
101 | *pud_p = (pudval_t)pmd_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; | |
102 | } | |
78d77df7 | 103 | pmd = (physaddr & PMD_MASK) + early_pmd_flags; |
6b9c75ac | 104 | pmd_p[pmd_index(address)] = pmd; |
8170e6be PA |
105 | |
106 | return 0; | |
cfd243d4 VG |
107 | } |
108 | ||
1da177e4 LT |
109 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
110 | yet. */ | |
111 | static void __init clear_bss(void) | |
112 | { | |
1da177e4 | 113 | memset(__bss_start, 0, |
2bc0414e | 114 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
1da177e4 LT |
115 | } |
116 | ||
f1da834c YL |
117 | static unsigned long get_cmd_line_ptr(void) |
118 | { | |
119 | unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; | |
120 | ||
ee92d815 YL |
121 | cmd_line_ptr |= (u64)boot_params.ext_cmd_line_ptr << 32; |
122 | ||
f1da834c YL |
123 | return cmd_line_ptr; |
124 | } | |
125 | ||
1da177e4 LT |
126 | static void __init copy_bootdata(char *real_mode_data) |
127 | { | |
1da177e4 | 128 | char * command_line; |
f1da834c | 129 | unsigned long cmd_line_ptr; |
1da177e4 | 130 | |
30c82645 | 131 | memcpy(&boot_params, real_mode_data, sizeof boot_params); |
5dcd14ec | 132 | sanitize_boot_params(&boot_params); |
f1da834c YL |
133 | cmd_line_ptr = get_cmd_line_ptr(); |
134 | if (cmd_line_ptr) { | |
135 | command_line = __va(cmd_line_ptr); | |
30c82645 | 136 | memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
1da177e4 | 137 | } |
1da177e4 LT |
138 | } |
139 | ||
2605fc21 | 140 | asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data) |
1da177e4 | 141 | { |
1da177e4 LT |
142 | int i; |
143 | ||
b4e0409a IM |
144 | /* |
145 | * Build-time sanity checks on the kernel image and module | |
146 | * area mappings. (these are purely build-time and produce no code) | |
147 | */ | |
8e3c2a8c BP |
148 | BUILD_BUG_ON(MODULES_VADDR < __START_KERNEL_map); |
149 | BUILD_BUG_ON(MODULES_VADDR - __START_KERNEL_map < KERNEL_IMAGE_SIZE); | |
b4e0409a | 150 | BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE); |
8e3c2a8c | 151 | BUILD_BUG_ON((__START_KERNEL_map & ~PMD_MASK) != 0); |
b4e0409a IM |
152 | BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0); |
153 | BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL)); | |
154 | BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) == | |
155 | (__START_KERNEL & PGDIR_MASK))); | |
66d4bdf2 | 156 | BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END); |
b4e0409a | 157 | |
8170e6be PA |
158 | /* Kill off the identity-map trampoline */ |
159 | reset_early_page_tables(); | |
160 | ||
3df0af0e YL |
161 | /* clear bss before set_intr_gate with early_idt_handler */ |
162 | clear_bss(); | |
163 | ||
ac630dd9 | 164 | for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) |
25c74b10 | 165 | set_intr_gate(i, early_idt_handlers[i]); |
9d1c6e7c | 166 | load_idt((const struct desc_ptr *)&idt_descr); |
f6c2e333 | 167 | |
fa2bbce9 YL |
168 | copy_bootdata(__va(real_mode_data)); |
169 | ||
feddc9de FY |
170 | /* |
171 | * Load microcode early on BSP. | |
172 | */ | |
173 | load_ucode_bsp(); | |
174 | ||
a8fe19eb | 175 | if (console_loglevel >= CONSOLE_LOGLEVEL_DEBUG) |
12544697 | 176 | early_printk("Kernel alive\n"); |
2148270c | 177 | |
8170e6be PA |
178 | clear_page(init_level4_pgt); |
179 | /* set init_level4_pgt kernel high mapping*/ | |
180 | init_level4_pgt[511] = early_level4_pgt[511]; | |
181 | ||
f97013fd JF |
182 | x86_64_start_reservations(real_mode_data); |
183 | } | |
184 | ||
185 | void __init x86_64_start_reservations(char *real_mode_data) | |
186 | { | |
fa2bbce9 YL |
187 | /* version is always not zero if it is copied */ |
188 | if (!boot_params.hdr.version) | |
189 | copy_bootdata(__va(real_mode_data)); | |
9de819fe | 190 | |
47a3d5da | 191 | reserve_ebda_region(); |
75175278 | 192 | |
1da177e4 LT |
193 | start_kernel(); |
194 | } |