Linux Kernel  3.7.1
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head32.c
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1 /*
2  * linux/arch/i386/kernel/head32.c -- prepare to run common code
3  *
4  * Copyright (C) 2000 Andrea Arcangeli <[email protected]> SuSE
5  * Copyright (C) 2007 Eric Biederman <[email protected]>
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/apic.h>
18 #include <asm/io_apic.h>
19 #include <asm/bios_ebda.h>
20 #include <asm/tlbflush.h>
21 
22 static void __init i386_default_early_setup(void)
23 {
24  /* Initialize 32bit specific setup functions */
25  x86_init.resources.reserve_resources = i386_reserve_resources;
26  x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc;
27 
29 }
30 
32 {
35 
36 #ifdef CONFIG_BLK_DEV_INITRD
37  /* Reserve INITRD */
38  if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
39  /* Assume only end is not page aligned */
40  u64 ramdisk_image = boot_params.hdr.ramdisk_image;
41  u64 ramdisk_size = boot_params.hdr.ramdisk_size;
42  u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size);
43  memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image);
44  }
45 #endif
46 
47  /* Call the subarch specific early setup function */
48  switch (boot_params.hdr.hardware_subarch) {
49  case X86_SUBARCH_MRST:
51  break;
52  case X86_SUBARCH_CE4100:
54  break;
55  default:
56  i386_default_early_setup();
57  break;
58  }
59 
60  /*
61  * At this point everything still needed from the boot loader
62  * or BIOS or kernel text should be early reserved or marked not
63  * RAM in e820. All other memory is free game.
64  */
65 
66  start_kernel();
67 }