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 #include <linux/mm.h>
11 #include <linux/memblock.h>
12 
13 #include <asm/setup.h>
14 #include <asm/sections.h>
15 #include <asm/e820.h>
16 #include <asm/page.h>
17 #include <asm/trampoline.h>
18 #include <asm/apic.h>
19 #include <asm/io_apic.h>
20 #include <asm/bios_ebda.h>
21 #include <asm/tlbflush.h>
22 
i386_default_early_setup(void)23 static void __init i386_default_early_setup(void)
24 {
25 	/* Initialize 32bit specific setup functions */
26 	x86_init.resources.probe_roms = probe_roms;
27 	x86_init.resources.reserve_resources = i386_reserve_resources;
28 	x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc;
29 
30 	reserve_ebda_region();
31 }
32 
i386_start_kernel(void)33 void __init i386_start_kernel(void)
34 {
35 	memblock_init();
36 
37 	memblock_x86_reserve_range(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS");
38 
39 #ifdef CONFIG_BLK_DEV_INITRD
40 	/* Reserve INITRD */
41 	if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
42 		/* Assume only end is not page aligned */
43 		u64 ramdisk_image = boot_params.hdr.ramdisk_image;
44 		u64 ramdisk_size  = boot_params.hdr.ramdisk_size;
45 		u64 ramdisk_end   = PAGE_ALIGN(ramdisk_image + ramdisk_size);
46 		memblock_x86_reserve_range(ramdisk_image, ramdisk_end, "RAMDISK");
47 	}
48 #endif
49 
50 	/* Call the subarch specific early setup function */
51 	switch (boot_params.hdr.hardware_subarch) {
52 	case X86_SUBARCH_MRST:
53 		x86_mrst_early_setup();
54 		break;
55 	case X86_SUBARCH_CE4100:
56 		x86_ce4100_early_setup();
57 		break;
58 	default:
59 		i386_default_early_setup();
60 		break;
61 	}
62 
63 	/*
64 	 * At this point everything still needed from the boot loader
65 	 * or BIOS or kernel text should be early reserved or marked not
66 	 * RAM in e820. All other memory is free game.
67 	 */
68 
69 	start_kernel();
70 }
71