2 * prepare to run common code
4 * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
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>
16 #include <asm/processor.h>
17 #include <asm/proto.h>
19 #include <asm/setup.h>
21 #include <asm/pgtable.h>
22 #include <asm/tlbflush.h>
23 #include <asm/sections.h>
24 #include <asm/kdebug.h>
26 #include <asm/bios_ebda.h>
28 static void __init zap_identity_mappings(void)
30 pgd_t *pgd = pgd_offset_k(0UL);
35 /* Don't add a printk in there. printk relies on the PDA which is not initialized
37 static void __init clear_bss(void)
39 memset(__bss_start, 0,
40 (unsigned long) __bss_stop - (unsigned long) __bss_start);
43 static void __init copy_bootdata(char *real_mode_data)
47 memcpy(&boot_params, real_mode_data, sizeof boot_params);
48 if (boot_params.hdr.cmd_line_ptr) {
49 command_line = __va(boot_params.hdr.cmd_line_ptr);
50 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
54 static void __init reserve_setup_data(void)
56 struct setup_data *data;
57 unsigned long pa_data;
60 if (boot_params.hdr.version < 0x0209)
62 pa_data = boot_params.hdr.setup_data;
64 data = early_ioremap(pa_data, sizeof(*data));
65 sprintf(buf, "setup data %x", data->type);
66 reserve_early(pa_data, pa_data+sizeof(*data)+data->len, buf);
68 early_iounmap(data, sizeof(*data));
72 void __init x86_64_start_kernel(char * real_mode_data)
77 * Build-time sanity checks on the kernel image and module
78 * area mappings. (these are purely build-time and produce no code)
80 BUILD_BUG_ON(MODULES_VADDR < KERNEL_IMAGE_START);
81 BUILD_BUG_ON(MODULES_VADDR-KERNEL_IMAGE_START < KERNEL_IMAGE_SIZE);
82 BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE);
83 BUILD_BUG_ON((KERNEL_IMAGE_START & ~PMD_MASK) != 0);
84 BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0);
85 BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));
86 BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) ==
87 (__START_KERNEL & PGDIR_MASK)));
89 /* clear bss before set_intr_gate with early_idt_handler */
92 /* Make NULL pointers segfault */
93 zap_identity_mappings();
95 /* Cleanup the over mapped high alias */
98 for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) {
99 #ifdef CONFIG_EARLY_PRINTK
100 set_intr_gate(i, &early_idt_handlers[i]);
102 set_intr_gate(i, early_idt_handler);
105 load_idt((const struct desc_ptr *)&idt_descr);
107 early_printk("Kernel alive\n");
109 for (i = 0; i < NR_CPUS; i++)
110 cpu_pda(i) = &boot_cpu_pda[i];
113 copy_bootdata(__va(real_mode_data));
115 reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS");
117 #ifdef CONFIG_BLK_DEV_INITRD
119 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
120 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
121 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
122 unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
123 reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
127 reserve_ebda_region();
128 reserve_setup_data();
131 * At this point everything still needed from the boot loader
132 * or BIOS or kernel text should be early reserved or marked not
133 * RAM in e820. All other memory is free game.