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>
15 #include <linux/memblock.h>
17 #include <asm/processor.h>
18 #include <asm/proto.h>
20 #include <asm/setup.h>
22 #include <asm/pgtable.h>
23 #include <asm/tlbflush.h>
24 #include <asm/sections.h>
25 #include <asm/kdebug.h>
27 #include <asm/trampoline.h>
28 #include <asm/bios_ebda.h>
30 static void __init
zap_identity_mappings(void)
32 pgd_t
*pgd
= pgd_offset_k(0UL);
37 /* Don't add a printk in there. printk relies on the PDA which is not initialized
39 static void __init
clear_bss(void)
41 memset(__bss_start
, 0,
42 (unsigned long) __bss_stop
- (unsigned long) __bss_start
);
45 static void __init
copy_bootdata(char *real_mode_data
)
49 memcpy(&boot_params
, real_mode_data
, sizeof boot_params
);
50 if (boot_params
.hdr
.cmd_line_ptr
) {
51 command_line
= __va(boot_params
.hdr
.cmd_line_ptr
);
52 memcpy(boot_command_line
, command_line
, COMMAND_LINE_SIZE
);
56 void __init
x86_64_start_kernel(char * real_mode_data
)
61 * Build-time sanity checks on the kernel image and module
62 * area mappings. (these are purely build-time and produce no code)
64 BUILD_BUG_ON(MODULES_VADDR
< KERNEL_IMAGE_START
);
65 BUILD_BUG_ON(MODULES_VADDR
-KERNEL_IMAGE_START
< KERNEL_IMAGE_SIZE
);
66 BUILD_BUG_ON(MODULES_LEN
+ KERNEL_IMAGE_SIZE
> 2*PUD_SIZE
);
67 BUILD_BUG_ON((KERNEL_IMAGE_START
& ~PMD_MASK
) != 0);
68 BUILD_BUG_ON((MODULES_VADDR
& ~PMD_MASK
) != 0);
69 BUILD_BUG_ON(!(MODULES_VADDR
> __START_KERNEL
));
70 BUILD_BUG_ON(!(((MODULES_END
- 1) & PGDIR_MASK
) ==
71 (__START_KERNEL
& PGDIR_MASK
)));
72 BUILD_BUG_ON(__fix_to_virt(__end_of_fixed_addresses
) <= MODULES_END
);
74 /* clear bss before set_intr_gate with early_idt_handler */
77 /* Make NULL pointers segfault */
78 zap_identity_mappings();
80 max_pfn_mapped
= KERNEL_IMAGE_SIZE
>> PAGE_SHIFT
;
82 for (i
= 0; i
< NUM_EXCEPTION_VECTORS
; i
++) {
83 #ifdef CONFIG_EARLY_PRINTK
84 set_intr_gate(i
, &early_idt_handlers
[i
]);
86 set_intr_gate(i
, early_idt_handler
);
89 load_idt((const struct desc_ptr
*)&idt_descr
);
91 if (console_loglevel
== 10)
92 early_printk("Kernel alive\n");
94 x86_64_start_reservations(real_mode_data
);
97 void __init
x86_64_start_reservations(char *real_mode_data
)
99 copy_bootdata(__va(real_mode_data
));
101 memblock_reserve(__pa_symbol(&_text
),
102 __pa_symbol(&__bss_stop
) - __pa_symbol(&_text
));
104 #ifdef CONFIG_BLK_DEV_INITRD
106 if (boot_params
.hdr
.type_of_loader
&& boot_params
.hdr
.ramdisk_image
) {
107 /* Assume only end is not page aligned */
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
= PAGE_ALIGN(ramdisk_image
+ ramdisk_size
);
111 memblock_reserve(ramdisk_image
, ramdisk_end
- ramdisk_image
);
115 reserve_ebda_region();
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.