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 12#include <asm/setup.h> 13#include <asm/sections.h> 14#include <asm/e820.h> 15#include <asm/page.h> 16#include <asm/trampoline.h> 17#include <asm/apic.h> 18#include <asm/io_apic.h> 19#include <asm/bios_ebda.h> 20 21static void __init i386_default_early_setup(void) 22{ 23 /* Initialize 32bit specific setup functions */ 24 x86_init.resources.probe_roms = probe_roms; 25 x86_init.resources.reserve_resources = i386_reserve_resources; 26 x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc; 27 28 reserve_ebda_region(); 29} 30 31void __init i386_start_kernel(void) 32{ 33#ifdef CONFIG_X86_TRAMPOLINE 34 reserve_early_overlap_ok(PAGE_SIZE, PAGE_SIZE + PAGE_SIZE, 35 "EX TRAMPOLINE"); 36#endif 37 38 reserve_early(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS"); 39 40#ifdef CONFIG_BLK_DEV_INITRD 41 /* Reserve INITRD */ 42 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { 43 /* Assume only end is not page aligned */ 44 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 45 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 46 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 47 reserve_early(ramdisk_image, ramdisk_end, "RAMDISK"); 48 } 49#endif 50 51 /* Call the subarch specific early setup function */ 52 switch (boot_params.hdr.hardware_subarch) { 53 case X86_SUBARCH_MRST: 54 x86_mrst_early_setup(); 55 break; 56 default: 57 i386_default_early_setup(); 58 break; 59 } 60 61 /* 62 * At this point everything still needed from the boot loader 63 * or BIOS or kernel text should be early reserved or marked not 64 * RAM in e820. All other memory is free game. 65 */ 66 67 start_kernel(); 68} 69