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1/*
2 * prepare to run common code
3 *
4 * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
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>
13#include <linux/start_kernel.h>
14#include <linux/io.h>
15#include <linux/memblock.h>
16
17#include <asm/processor.h>
18#include <asm/proto.h>
19#include <asm/smp.h>
20#include <asm/setup.h>
21#include <asm/desc.h>
22#include <asm/pgtable.h>
23#include <asm/tlbflush.h>
24#include <asm/sections.h>
25#include <asm/kdebug.h>
26#include <asm/e820.h>
27#include <asm/bios_ebda.h>
28#include <asm/bootparam_utils.h>
29#include <asm/microcode.h>
30
31/*
32 * Manage page tables very early on.
33 */
34extern pgd_t early_level4_pgt[PTRS_PER_PGD];
35extern pmd_t early_dynamic_pgts[EARLY_DYNAMIC_PAGE_TABLES][PTRS_PER_PMD];
36static unsigned int __initdata next_early_pgt = 2;
37pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX);
38
39/* Wipe all early page tables except for the kernel symbol map */
40static void __init reset_early_page_tables(void)
41{
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 */
53int __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;
58 pudval_t pud, *pud_p;
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
65again:
66 pgd_p = &early_level4_pgt[pgd_index(address)].pgd;
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 */
74 if (pgd)
75 pud_p = (pudval_t *)((pgd & PTE_PFN_MASK) + __START_KERNEL_map - phys_base);
76 else {
77 if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) {
78 reset_early_page_tables();
79 goto again;
80 }
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;
85 *pgd_p = (pgdval_t)pud_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE;
86 }
87 pud_p += pud_index(address);
88 pud = *pud_p;
89
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 }
103 pmd = (physaddr & PMD_MASK) + early_pmd_flags;
104 pmd_p[pmd_index(address)] = pmd;
105
106 return 0;
107}
108
109/* Don't add a printk in there. printk relies on the PDA which is not initialized
110 yet. */
111static void __init clear_bss(void)
112{
113 memset(__bss_start, 0,
114 (unsigned long) __bss_stop - (unsigned long) __bss_start);
115}
116
117static unsigned long get_cmd_line_ptr(void)
118{
119 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
120
121 cmd_line_ptr |= (u64)boot_params.ext_cmd_line_ptr << 32;
122
123 return cmd_line_ptr;
124}
125
126static void __init copy_bootdata(char *real_mode_data)
127{
128 char * command_line;
129 unsigned long cmd_line_ptr;
130
131 memcpy(&boot_params, real_mode_data, sizeof boot_params);
132 sanitize_boot_params(&boot_params);
133 cmd_line_ptr = get_cmd_line_ptr();
134 if (cmd_line_ptr) {
135 command_line = __va(cmd_line_ptr);
136 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
137 }
138}
139
140asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data)
141{
142 int i;
143
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 */
148 BUILD_BUG_ON(MODULES_VADDR < __START_KERNEL_map);
149 BUILD_BUG_ON(MODULES_VADDR - __START_KERNEL_map < KERNEL_IMAGE_SIZE);
150 BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE);
151 BUILD_BUG_ON((__START_KERNEL_map & ~PMD_MASK) != 0);
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)));
156 BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END);
157
158 /* Kill off the identity-map trampoline */
159 reset_early_page_tables();
160
161 /* clear bss before set_intr_gate with early_idt_handler */
162 clear_bss();
163
164 for (i = 0; i < NUM_EXCEPTION_VECTORS; i++)
165 set_intr_gate(i, early_idt_handlers[i]);
166 load_idt((const struct desc_ptr *)&idt_descr);
167
168 copy_bootdata(__va(real_mode_data));
169
170 /*
171 * Load microcode early on BSP.
172 */
173 load_ucode_bsp();
174
175 if (console_loglevel == 10)
176 early_printk("Kernel alive\n");
177
178 clear_page(init_level4_pgt);
179 /* set init_level4_pgt kernel high mapping*/
180 init_level4_pgt[511] = early_level4_pgt[511];
181
182 x86_64_start_reservations(real_mode_data);
183}
184
185void __init x86_64_start_reservations(char *real_mode_data)
186{
187 /* version is always not zero if it is copied */
188 if (!boot_params.hdr.version)
189 copy_bootdata(__va(real_mode_data));
190
191 reserve_ebda_region();
192
193 start_kernel();
194}
1/*
2 * prepare to run common code
3 *
4 * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
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>
13#include <linux/start_kernel.h>
14#include <linux/io.h>
15#include <linux/memblock.h>
16
17#include <asm/processor.h>
18#include <asm/proto.h>
19#include <asm/smp.h>
20#include <asm/setup.h>
21#include <asm/desc.h>
22#include <asm/pgtable.h>
23#include <asm/tlbflush.h>
24#include <asm/sections.h>
25#include <asm/kdebug.h>
26#include <asm/e820.h>
27#include <asm/bios_ebda.h>
28#include <asm/bootparam_utils.h>
29#include <asm/microcode.h>
30#include <asm/kasan.h>
31
32/*
33 * Manage page tables very early on.
34 */
35extern pgd_t early_level4_pgt[PTRS_PER_PGD];
36extern pmd_t early_dynamic_pgts[EARLY_DYNAMIC_PAGE_TABLES][PTRS_PER_PMD];
37static unsigned int __initdata next_early_pgt = 2;
38pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX);
39
40/* Wipe all early page tables except for the kernel symbol map */
41static void __init reset_early_page_tables(void)
42{
43 memset(early_level4_pgt, 0, sizeof(pgd_t)*(PTRS_PER_PGD-1));
44 next_early_pgt = 0;
45 write_cr3(__pa_nodebug(early_level4_pgt));
46}
47
48/* Create a new PMD entry */
49int __init early_make_pgtable(unsigned long address)
50{
51 unsigned long physaddr = address - __PAGE_OFFSET;
52 pgdval_t pgd, *pgd_p;
53 pudval_t pud, *pud_p;
54 pmdval_t pmd, *pmd_p;
55
56 /* Invalid address or early pgt is done ? */
57 if (physaddr >= MAXMEM || read_cr3() != __pa_nodebug(early_level4_pgt))
58 return -1;
59
60again:
61 pgd_p = &early_level4_pgt[pgd_index(address)].pgd;
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 */
69 if (pgd)
70 pud_p = (pudval_t *)((pgd & PTE_PFN_MASK) + __START_KERNEL_map - phys_base);
71 else {
72 if (next_early_pgt >= EARLY_DYNAMIC_PAGE_TABLES) {
73 reset_early_page_tables();
74 goto again;
75 }
76
77 pud_p = (pudval_t *)early_dynamic_pgts[next_early_pgt++];
78 memset(pud_p, 0, sizeof(*pud_p) * PTRS_PER_PUD);
79 *pgd_p = (pgdval_t)pud_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE;
80 }
81 pud_p += pud_index(address);
82 pud = *pud_p;
83
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++];
93 memset(pmd_p, 0, sizeof(*pmd_p) * PTRS_PER_PMD);
94 *pud_p = (pudval_t)pmd_p - __START_KERNEL_map + phys_base + _KERNPG_TABLE;
95 }
96 pmd = (physaddr & PMD_MASK) + early_pmd_flags;
97 pmd_p[pmd_index(address)] = pmd;
98
99 return 0;
100}
101
102/* Don't add a printk in there. printk relies on the PDA which is not initialized
103 yet. */
104static void __init clear_bss(void)
105{
106 memset(__bss_start, 0,
107 (unsigned long) __bss_stop - (unsigned long) __bss_start);
108}
109
110static unsigned long get_cmd_line_ptr(void)
111{
112 unsigned long cmd_line_ptr = boot_params.hdr.cmd_line_ptr;
113
114 cmd_line_ptr |= (u64)boot_params.ext_cmd_line_ptr << 32;
115
116 return cmd_line_ptr;
117}
118
119static void __init copy_bootdata(char *real_mode_data)
120{
121 char * command_line;
122 unsigned long cmd_line_ptr;
123
124 memcpy(&boot_params, real_mode_data, sizeof boot_params);
125 sanitize_boot_params(&boot_params);
126 cmd_line_ptr = get_cmd_line_ptr();
127 if (cmd_line_ptr) {
128 command_line = __va(cmd_line_ptr);
129 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
130 }
131}
132
133asmlinkage __visible void __init x86_64_start_kernel(char * real_mode_data)
134{
135 int i;
136
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 */
141 BUILD_BUG_ON(MODULES_VADDR < __START_KERNEL_map);
142 BUILD_BUG_ON(MODULES_VADDR - __START_KERNEL_map < KERNEL_IMAGE_SIZE);
143 BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE);
144 BUILD_BUG_ON((__START_KERNEL_map & ~PMD_MASK) != 0);
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)));
149 BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END);
150
151 cr4_init_shadow();
152
153 /* Kill off the identity-map trampoline */
154 reset_early_page_tables();
155
156 clear_bss();
157
158 clear_page(init_level4_pgt);
159
160 kasan_early_init();
161
162 for (i = 0; i < NUM_EXCEPTION_VECTORS; i++)
163 set_intr_gate(i, early_idt_handler_array[i]);
164 load_idt((const struct desc_ptr *)&idt_descr);
165
166 copy_bootdata(__va(real_mode_data));
167
168 /*
169 * Load microcode early on BSP.
170 */
171 load_ucode_bsp();
172
173 /* set init_level4_pgt kernel high mapping*/
174 init_level4_pgt[511] = early_level4_pgt[511];
175
176 x86_64_start_reservations(real_mode_data);
177}
178
179void __init x86_64_start_reservations(char *real_mode_data)
180{
181 /* version is always not zero if it is copied */
182 if (!boot_params.hdr.version)
183 copy_bootdata(__va(real_mode_data));
184
185 reserve_ebda_region();
186
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
195 start_kernel();
196}