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 21 static void __init i386_default_early_setup(void) 22 { 23 /* Initilize 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 31 void __init i386_start_kernel(void) 32 { 33 #ifdef CONFIG_X86_TRAMPOLINE 34 /* 35 * But first pinch a few for the stack/trampoline stuff 36 * FIXME: Don't need the extra page at 4K, but need to fix 37 * trampoline before removing it. (see the GDT stuff) 38 */ 39 reserve_early_overlap_ok(PAGE_SIZE, PAGE_SIZE + PAGE_SIZE, 40 "EX TRAMPOLINE"); 41 #endif 42 43 reserve_early(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS"); 44 45 #ifdef CONFIG_BLK_DEV_INITRD 46 /* Reserve INITRD */ 47 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { 48 /* Assume only end is not page aligned */ 49 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 50 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 51 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 52 reserve_early(ramdisk_image, ramdisk_end, "RAMDISK"); 53 } 54 #endif 55 56 /* Call the subarch specific early setup function */ 57 switch (boot_params.hdr.hardware_subarch) { 58 case X86_SUBARCH_MRST: 59 x86_mrst_early_setup(); 60 break; 61 default: 62 i386_default_early_setup(); 63 break; 64 } 65 66 /* 67 * At this point everything still needed from the boot loader 68 * or BIOS or kernel text should be early reserved or marked not 69 * RAM in e820. All other memory is free game. 70 */ 71 72 start_kernel(); 73 } 74