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>
27 #include <asm/trampoline.h>
29 /* boot cpu pda, referenced by head_64.S to initialize %gs for boot CPU */
30 struct x8664_pda _boot_cpu_pda;
32 void __init x86_64_init_pda(void)
34 cpu_pda(0) = &_boot_cpu_pda;
35 cpu_pda(0)->data_offset =
36 (unsigned long)(__per_cpu_load - __per_cpu_start);
40 static void __init zap_identity_mappings(void)
42 pgd_t *pgd = pgd_offset_k(0UL);
47 /* Don't add a printk in there. printk relies on the PDA which is not initialized
49 static void __init clear_bss(void)
51 memset(__bss_start, 0,
52 (unsigned long) __bss_stop - (unsigned long) __bss_start);
55 static void __init copy_bootdata(char *real_mode_data)
59 memcpy(&boot_params, real_mode_data, sizeof boot_params);
60 if (boot_params.hdr.cmd_line_ptr) {
61 command_line = __va(boot_params.hdr.cmd_line_ptr);
62 memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
66 void __init x86_64_start_kernel(char * real_mode_data)
71 * Build-time sanity checks on the kernel image and module
72 * area mappings. (these are purely build-time and produce no code)
74 BUILD_BUG_ON(MODULES_VADDR < KERNEL_IMAGE_START);
75 BUILD_BUG_ON(MODULES_VADDR-KERNEL_IMAGE_START < KERNEL_IMAGE_SIZE);
76 BUILD_BUG_ON(MODULES_LEN + KERNEL_IMAGE_SIZE > 2*PUD_SIZE);
77 BUILD_BUG_ON((KERNEL_IMAGE_START & ~PMD_MASK) != 0);
78 BUILD_BUG_ON((MODULES_VADDR & ~PMD_MASK) != 0);
79 BUILD_BUG_ON(!(MODULES_VADDR > __START_KERNEL));
80 BUILD_BUG_ON(!(((MODULES_END - 1) & PGDIR_MASK) ==
81 (__START_KERNEL & PGDIR_MASK)));
82 BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses) <= MODULES_END);
84 /* clear bss before set_intr_gate with early_idt_handler */
87 /* Make NULL pointers segfault */
88 zap_identity_mappings();
90 /* Cleanup the over mapped high alias */
93 for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) {
94 #ifdef CONFIG_EARLY_PRINTK
95 set_intr_gate(i, &early_idt_handlers[i]);
97 set_intr_gate(i, early_idt_handler);
100 load_idt((const struct desc_ptr *)&idt_descr);
102 if (console_loglevel == 10)
103 early_printk("Kernel alive\n");
107 x86_64_start_reservations(real_mode_data);
110 void __init x86_64_start_reservations(char *real_mode_data)
112 copy_bootdata(__va(real_mode_data));
114 reserve_trampoline_memory();
116 reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS");
118 #ifdef CONFIG_BLK_DEV_INITRD
120 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
121 unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
122 unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
123 unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
124 reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
128 reserve_ebda_region();
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.