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