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
16 #include <asm/processor.h>
17 #include <asm/proto.h>
18 #include <asm/smp.h>
19 #include <asm/setup.h>
20 #include <asm/desc.h>
21 #include <asm/pgtable.h>
22 #include <asm/tlbflush.h>
23 #include <asm/sections.h>
24 #include <asm/kdebug.h>
25 #include <asm/e820.h>
26 #include <asm/bios_ebda.h>
27 #include <asm/trampoline.h>
28
29 static void __init zap_identity_mappings(void)
30 {
31 pgd_t *pgd = pgd_offset_k(0UL);
32 pgd_clear(pgd);
33 __flush_tlb_all();
34 }
35
36 /* Don't add a printk in there. printk relies on the PDA which is not initialized
37 yet. */
38 static void __init clear_bss(void)
39 {
40 memset(__bss_start, 0,
41 (unsigned long) __bss_stop - (unsigned long) __bss_start);
42 }
43
44 static void __init copy_bootdata(char *real_mode_data)
45 {
46 char * command_line;
47
48 memcpy(&boot_params, real_mode_data, sizeof boot_params);
49 if (boot_params.hdr.cmd_line_ptr) {
50 command_line = __va(boot_params.hdr.cmd_line_ptr);
51 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
52 }
53 }
54
55 void __init x86_64_start_kernel(char * real_mode_data)
56 {
57 int i;
58
59 /*
60 * Build-time sanity checks on the kernel image and module
61 * area mappings. (these are purely build-time and produce no code)
62 */
63 BUILD_BUG_ON(MODULES_VADDR < KERNEL_IMAGE_START);
64 BUILD_BUG_ON(MODULES_VADDR-KERNEL_IMAGE_START < KERNEL_IMAGE_SIZE);
65 BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE);
66 BUILD_BUG_ON((KERNEL_IMAGE_START & ~PMD_MASK) != 0);
67 BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0);
68 BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));
69 BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) ==
70 (__START_KERNEL & PGDIR_MASK)));
71 BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END);
72
73 /* clear bss before set_intr_gate with early_idt_handler */
74 clear_bss();
75
76 /* Make NULL pointers segfault */
77 zap_identity_mappings();
78
79 /* Cleanup the over mapped high alias */
80 cleanup_highmap();
81
82 for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) {
83 #ifdef CONFIG_EARLY_PRINTK
84 set_intr_gate(i, &early_idt_handlers[i]);
85 #else
86 set_intr_gate(i, early_idt_handler);
87 #endif
88 }
89 load_idt((const struct desc_ptr *)&idt_descr);
90
91 if (console_loglevel == 10)
92 early_printk("Kernel alive\n");
93
94 x86_64_start_reservations(real_mode_data);
95 }
96
97 void __init x86_64_start_reservations(char *real_mode_data)
98 {
99 copy_bootdata(__va(real_mode_data));
100
101 reserve_trampoline_memory();
102
103 reserve_early(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS");
104
105 #ifdef CONFIG_BLK_DEV_INITRD
106 /* Reserve INITRD */
107 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
108 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
109 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
110 unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
111 reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
112 }
113 #endif
114
115 reserve_ebda_region();
116
117 /*
118 * At this point everything still needed from the boot loader
119 * or BIOS or kernel text should be early reserved or marked not
120 * RAM in e820. All other memory is free game.
121 */
122
123 start_kernel();
124 }
125
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