xref: /openbmc/linux/arch/x86/kernel/head32.c (revision 0c51a965)
1 /*
2  *  linux/arch/i386/kernel/head32.c -- prepare to run common code
3  *
4  *  Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE
5  *  Copyright (C) 2007 Eric Biederman <ebiederm@xmission.com>
6  */
7 
8 #include <linux/init.h>
9 #include <linux/start_kernel.h>
10 
11 #include <asm/setup.h>
12 #include <asm/sections.h>
13 #include <asm/e820.h>
14 #include <asm/bios_ebda.h>
15 
16 void __init i386_start_kernel(void)
17 {
18 	reserve_early(__pa_symbol(&_text), __pa_symbol(&_end), "TEXT DATA BSS");
19 
20 #ifdef CONFIG_BLK_DEV_INITRD
21 	/* Reserve INITRD */
22 	if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
23 		u64 ramdisk_image = boot_params.hdr.ramdisk_image;
24 		u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
25 		u64 ramdisk_end   = ramdisk_image + ramdisk_size;
26 		reserve_early(ramdisk_image, ramdisk_end, "RAMDISK");
27 	}
28 #endif
29 	reserve_early(init_pg_tables_start, init_pg_tables_end,
30 			"INIT_PG_TABLE");
31 
32 	reserve_ebda_region();
33 
34 	/*
35 	 * At this point everything still needed from the boot loader
36 	 * or BIOS or kernel text should be early reserved or marked not
37 	 * RAM in e820. All other memory is free game.
38 	 */
39 
40 	start_kernel();
41 }
42