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> |
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; | |
37 | ||
38 | /* Wipe all early page tables except for the kernel symbol map */ | |
39 | static void __init reset_early_page_tables(void) | |
cfd243d4 | 40 | { |
8170e6be PA |
41 | unsigned long i; |
42 | ||
43 | for (i = 0; i < PTRS_PER_PGD-1; i++) | |
44 | early_level4_pgt[i].pgd = 0; | |
45 | ||
46 | next_early_pgt = 0; | |
47 | ||
48 | write_cr3(__pa(early_level4_pgt)); | |
49 | } | |
50 | ||
51 | /* Create a new PMD entry */ | |
52 | int __init early_make_pgtable(unsigned long address) | |
53 | { | |
54 | unsigned long physaddr = address - __PAGE_OFFSET; | |
55 | unsigned long i; | |
56 | pgdval_t pgd, *pgd_p; | |
6b9c75ac | 57 | pudval_t pud, *pud_p; |
8170e6be PA |
58 | pmdval_t pmd, *pmd_p; |
59 | ||
60 | /* Invalid address or early pgt is done ? */ | |
61 | if (physaddr >= MAXMEM || read_cr3() != __pa(early_level4_pgt)) | |
62 | return -1; | |
63 | ||
6b9c75ac YL |
64 | again: |
65 | pgd_p = &early_level4_pgt[pgd_index(address)].pgd; | |
8170e6be PA |
66 | pgd = *pgd_p; |
67 | ||
68 | /* | |
69 | * The use of __START_KERNEL_map rather than __PAGE_OFFSET here is | |
70 | * critical -- __PAGE_OFFSET would point us back into the dynamic | |
71 | * range and we might end up looping forever... | |
72 | */ | |
6b9c75ac | 73 | if (pgd) |
8170e6be | 74 | pud_p = (pudval_t *)((pgd & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); |
6b9c75ac YL |
75 | else { |
76 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
8170e6be | 77 | reset_early_page_tables(); |
6b9c75ac YL |
78 | goto again; |
79 | } | |
8170e6be PA |
80 | |
81 | pud_p = (pudval_t *)early_dynamic_pgts[next_early_pgt++]; | |
82 | for (i = 0; i < PTRS_PER_PUD; i++) | |
83 | pud_p[i] = 0; | |
8170e6be PA |
84 | *pgd_p = (pgdval_t)pud_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; |
85 | } | |
6b9c75ac YL |
86 | pud_p += pud_index(address); |
87 | pud = *pud_p; | |
8170e6be | 88 | |
6b9c75ac YL |
89 | if (pud) |
90 | pmd_p = (pmdval_t *)((pud & PTE_PFN_MASK) + __START_KERNEL_map - phys_base); | |
91 | else { | |
92 | if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) { | |
93 | reset_early_page_tables(); | |
94 | goto again; | |
95 | } | |
96 | ||
97 | pmd_p = (pmdval_t *)early_dynamic_pgts[next_early_pgt++]; | |
98 | for (i = 0; i < PTRS_PER_PMD; i++) | |
99 | pmd_p[i] = 0; | |
100 | *pud_p = (pudval_t)pmd_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE; | |
101 | } | |
102 | pmd = (physaddr & PMD_MASK) + (__PAGE_KERNEL_LARGE & ~_PAGE_GLOBAL); | |
103 | pmd_p[pmd_index(address)] = pmd; | |
8170e6be PA |
104 | |
105 | return 0; | |
cfd243d4 VG |
106 | } |
107 | ||
1da177e4 LT |
108 | /* Don't add a printk in there. printk relies on the PDA which is not initialized |
109 | yet. */ | |
110 | static void __init clear_bss(void) | |
111 | { | |
1da177e4 | 112 | memset(__bss_start, 0, |
2bc0414e | 113 | (unsigned long) __bss_stop - (unsigned long) __bss_start); |
1da177e4 LT |
114 | } |
115 | ||
f1da834c YL |
116 | static unsigned long get_cmd_line_ptr(void) |
117 | { | |
118 | unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr; | |
119 | ||
ee92d815 YL |
120 | cmd_line_ptr |= (u64)boot_params.ext_cmd_line_ptr << 32; |
121 | ||
f1da834c YL |
122 | return cmd_line_ptr; |
123 | } | |
124 | ||
1da177e4 LT |
125 | static void __init copy_bootdata(char *real_mode_data) |
126 | { | |
1da177e4 | 127 | char * command_line; |
f1da834c | 128 | unsigned long cmd_line_ptr; |
1da177e4 | 129 | |
30c82645 | 130 | memcpy(&boot_params, real_mode_data, sizeof boot_params); |
5dcd14ec | 131 | sanitize_boot_params(&boot_params); |
f1da834c YL |
132 | cmd_line_ptr = get_cmd_line_ptr(); |
133 | if (cmd_line_ptr) { | |
134 | command_line = __va(cmd_line_ptr); | |
30c82645 | 135 | memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE); |
1da177e4 | 136 | } |
1da177e4 LT |
137 | } |
138 | ||
1da177e4 LT |
139 | void __init x86_64_start_kernel(char * real_mode_data) |
140 | { | |
1da177e4 LT |
141 | int i; |
142 | ||
b4e0409a IM |
143 | /* |
144 | * Build-time sanity checks on the kernel image and module | |
145 | * area mappings. (these are purely build-time and produce no code) | |
146 | */ | |
147 | BUILD_BUG_ON(MODULES_VADDR < KERNEL_IMAGE_START); | |
148 | BUILD_BUG_ON(MODULES_VADDR-KERNEL_IMAGE_START < KERNEL_IMAGE_SIZE); | |
149 | BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE); | |
150 | BUILD_BUG_ON((KERNEL_IMAGE_START & ~PMD_MASK) != 0); | |
151 | BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0); | |
152 | BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL)); | |
153 | BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) == | |
154 | (__START_KERNEL & PGDIR_MASK))); | |
66d4bdf2 | 155 | BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END); |
b4e0409a | 156 | |
8170e6be PA |
157 | /* Kill off the identity-map trampoline */ |
158 | reset_early_page_tables(); | |
159 | ||
3df0af0e YL |
160 | /* clear bss before set_intr_gate with early_idt_handler */ |
161 | clear_bss(); | |
162 | ||
5524ea32 | 163 | for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) { |
076f9776 | 164 | #ifdef CONFIG_EARLY_PRINTK |
8866cd9d | 165 | set_intr_gate(i, &early_idt_handlers[i]); |
076f9776 IM |
166 | #else |
167 | set_intr_gate(i, early_idt_handler); | |
168 | #endif | |
169 | } | |
9d1c6e7c | 170 | load_idt((const struct desc_ptr *)&idt_descr); |
f6c2e333 | 171 | |
fa2bbce9 YL |
172 | copy_bootdata(__va(real_mode_data)); |
173 | ||
feddc9de FY |
174 | /* |
175 | * Load microcode early on BSP. | |
176 | */ | |
177 | load_ucode_bsp(); | |
178 | ||
12544697 | 179 | if (console_loglevel == 10) |
180 | early_printk("Kernel alive\n"); | |
2148270c | 181 | |
8170e6be PA |
182 | clear_page(init_level4_pgt); |
183 | /* set init_level4_pgt kernel high mapping*/ | |
184 | init_level4_pgt[511] = early_level4_pgt[511]; | |
185 | ||
f97013fd JF |
186 | x86_64_start_reservations(real_mode_data); |
187 | } | |
188 | ||
189 | void __init x86_64_start_reservations(char *real_mode_data) | |
190 | { | |
fa2bbce9 YL |
191 | /* version is always not zero if it is copied */ |
192 | if (!boot_params.hdr.version) | |
193 | copy_bootdata(__va(real_mode_data)); | |
9de819fe | 194 | |
47a3d5da | 195 | reserve_ebda_region(); |
75175278 | 196 | |
1da177e4 LT |
197 | start_kernel(); |
198 | } |