Commit | Line | Data |
---|---|---|
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 | { |
5e9ebbd8 | 43 | memset(early_level4_pgt, 0, sizeof(pgd_t)*(PTRS_PER_PGD-1)); |
8170e6be | 44 | next_early_pgt = 0; |
ef7f0d6a | 45 | write_cr3(__pa_nodebug(early_level4_pgt)); |
8170e6be PA |
46 | } |
47 | ||
48 | /* Create a new PMD entry */ | |
49 | int __init early_make_pgtable(unsigned long address) | |
50 | { | |
51 | unsigned long physaddr = address - __PAGE_OFFSET; | |
8170e6be | 52 | pgdval_t pgd, *pgd_p; |
6b9c75ac | 53 | pudval_t pud, *pud_p; |
8170e6be PA |
54 | pmdval_t pmd, *pmd_p; |
55 | ||
56 | /* Invalid address or early pgt is done ? */ | |
ef7f0d6a | 57 | if (physaddr >= MAXMEM || read_cr3() != __pa_nodebug(early_level4_pgt)) |
8170e6be PA |
58 | return -1; |
59 | ||
6b9c75ac YL |
60 | again: |
61 | pgd_p = &early_level4_pgt[pgd_index(address)].pgd; | |
8170e6be PA |
62 | pgd = *pgd_p; |
63 | ||
64 | /* | |
65 | * The use of __START_KERNEL_map rather than __PAGE_OFFSET here is | |
66 | * critical -- __PAGE_OFFSET would point us back into the dynamic | |
67 | * range and we might end up looping forever... | |
68 | */ | |
6b9c75ac | 69 | if (pgd) |
8170e6be | 70 | pud_p = (pudval_t *)((pgd & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); |
6b9c75ac YL |
71 | else { |
72 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
8170e6be | 73 | reset_early_page_tables(); |
6b9c75ac YL |
74 | goto again; |
75 | } | |
8170e6be PA |
76 | |
77 | pud_p = (pudval_t *)early_dynamic_pgts[next_early_pgt++]; | |
a91bbe01 | 78 | memset(pud_p, 0, sizeof(*pud_p) * PTRS_PER_PUD); |
8170e6be PA |
79 | *pgd_p = (pgdval_t)pud_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; |
80 | } | |
6b9c75ac YL |
81 | pud_p += pud_index(address); |
82 | pud = *pud_p; | |
8170e6be | 83 | |
6b9c75ac YL |
84 | if (pud) |
85 | pmd_p = (pmdval_t *)((pud & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
86 | else { | |
87 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
88 | reset_early_page_tables(); | |
89 | goto again; | |
90 | } | |
91 | ||
92 | pmd_p = (pmdval_t *)early_dynamic_pgts[next_early_pgt++]; | |
a91bbe01 | 93 | memset(pmd_p, 0, sizeof(*pmd_p) * PTRS_PER_PMD); |
6b9c75ac YL |
94 | *pud_p = (pudval_t)pmd_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; |
95 | } | |
78d77df7 | 96 | pmd = (physaddr & PMD_MASK) + early_pmd_flags; |
6b9c75ac | 97 | pmd_p[pmd_index(address)] = pmd; |
8170e6be PA |
98 | |
99 | return 0; | |
cfd243d4 VG |
100 | } |
101 | ||
1da177e4 LT |
102 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
103 | yet. */ | |
104 | static void __init clear_bss(void) | |
105 | { | |
1da177e4 | 106 | memset(__bss_start, 0, |
2bc0414e | 107 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
1da177e4 LT |
108 | } |
109 | ||
f1da834c YL |
110 | static unsigned long get_cmd_line_ptr(void) |
111 | { | |
112 | unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; | |
113 | ||
ee92d815 YL |
114 | cmd_line_ptr |= (u64)boot_params.ext_cmd_line_ptr << 32; |
115 | ||
f1da834c YL |
116 | return cmd_line_ptr; |
117 | } | |
118 | ||
1da177e4 LT |
119 | static void __init copy_bootdata(char *real_mode_data) |
120 | { | |
1da177e4 | 121 | char * command_line; |
f1da834c | 122 | unsigned long cmd_line_ptr; |
1da177e4 | 123 | |
30c82645 | 124 | memcpy(&boot_params, real_mode_data, sizeof boot_params); |
5dcd14ec | 125 | sanitize_boot_params(&boot_params); |
f1da834c YL |
126 | cmd_line_ptr = get_cmd_line_ptr(); |
127 | if (cmd_line_ptr) { | |
128 | command_line = __va(cmd_line_ptr); | |
30c82645 | 129 | memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
1da177e4 | 130 | } |
1da177e4 LT |
131 | } |
132 | ||
2605fc21 | 133 | asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data) |
1da177e4 | 134 | { |
1da177e4 LT |
135 | int i; |
136 | ||
b4e0409a IM |
137 | /* |
138 | * Build-time sanity checks on the kernel image and module | |
139 | * area mappings. (these are purely build-time and produce no code) | |
140 | */ | |
8e3c2a8c BP |
141 | BUILD_BUG_ON(MODULES_VADDR < __START_KERNEL_map); |
142 | BUILD_BUG_ON(MODULES_VADDR - __START_KERNEL_map < KERNEL_IMAGE_SIZE); | |
b4e0409a | 143 | BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE); |
8e3c2a8c | 144 | BUILD_BUG_ON((__START_KERNEL_map & ~PMD_MASK) != 0); |
b4e0409a IM |
145 | BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0); |
146 | BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL)); | |
147 | BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) == | |
148 | (__START_KERNEL & PGDIR_MASK))); | |
66d4bdf2 | 149 | BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END); |
b4e0409a | 150 | |
1e02ce4c AL |
151 | cr4_init_shadow(); |
152 | ||
8170e6be PA |
153 | /* Kill off the identity-map trampoline */ |
154 | reset_early_page_tables(); | |
155 | ||
3df0af0e YL |
156 | clear_bss(); |
157 | ||
d0f77d4d AR |
158 | clear_page(init_level4_pgt); |
159 | ||
5d5aa3cf AP |
160 | kasan_early_init(); |
161 | ||
ac630dd9 | 162 | for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) |
425be567 | 163 | set_intr_gate(i, early_idt_handler_array[i]); |
9d1c6e7c | 164 | load_idt((const struct desc_ptr *)&idt_descr); |
f6c2e333 | 165 | |
fa2bbce9 YL |
166 | copy_bootdata(__va(real_mode_data)); |
167 | ||
feddc9de FY |
168 | /* |
169 | * Load microcode early on BSP. | |
170 | */ | |
171 | load_ucode_bsp(); | |
172 | ||
8170e6be PA |
173 | /* set init_level4_pgt kernel high mapping*/ |
174 | init_level4_pgt[511] = early_level4_pgt[511]; | |
175 | ||
f97013fd JF |
176 | x86_64_start_reservations(real_mode_data); |
177 | } | |
178 | ||
179 | void __init x86_64_start_reservations(char *real_mode_data) | |
180 | { | |
fa2bbce9 YL |
181 | /* version is always not zero if it is copied */ |
182 | if (!boot_params.hdr.version) | |
183 | copy_bootdata(__va(real_mode_data)); | |
9de819fe | 184 | |
47a3d5da | 185 | reserve_ebda_region(); |
75175278 | 186 | |
3fda5bb4 AS |
187 | switch (boot_params.hdr.hardware_subarch) { |
188 | case X86_SUBARCH_INTEL_MID: | |
189 | x86_intel_mid_early_setup(); | |
190 | break; | |
191 | default: | |
192 | break; | |
193 | } | |
194 | ||
1da177e4 LT |
195 | start_kernel(); |
196 | } |