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 #ifdef CONFIG_X86_TRAMPOLINE 33 /* 34 * But first pinch a few for the stack/trampoline stuff 35 * FIXME: Don't need the extra page at 4K, but need to fix 36 * trampoline before removing it. (see the GDT stuff) 37 */ 38 reserve_early_overlap_ok(PAGE_SIZE, PAGE_SIZE + PAGE_SIZE, 39 "EX TRAMPOLINE"); 40 #endif 41 42 reserve_early(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS"); 43 44 #ifdef CONFIG_BLK_DEV_INITRD 45 /* Reserve INITRD */ 46 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { 47 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 48 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 49 u64 ramdisk_end = ramdisk_image + ramdisk_size; 50 reserve_early(ramdisk_image, ramdisk_end, "RAMDISK"); 51 } 52 #endif 53 54 /* Call the subarch specific early setup function */ 55 switch (boot_params.hdr.hardware_subarch) { 56 case X86_SUBARCH_MRST: 57 x86_mrst_early_setup(); 58 break; 59 default: 60 i386_default_early_setup(); 61 break; 62 } 63 64 /* 65 * At this point everything still needed from the boot loader 66 * or BIOS or kernel text should be early reserved or marked not 67 * RAM in e820. All other memory is free game. 68 */ 69 70 start_kernel(); 71 } 72