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 #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 #include <asm/bootparam_utils.h> 22 23 static void __init i386_default_early_setup(void) 24 { 25 /* Initialize 32bit specific setup functions */ 26 x86_init.resources.reserve_resources = i386_reserve_resources; 27 x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc; 28 29 reserve_ebda_region(); 30 } 31 32 void __init i386_start_kernel(void) 33 { 34 sanitize_boot_params(&boot_params); 35 36 memblock_reserve(__pa_symbol(&_text), 37 __pa_symbol(&__bss_stop) - __pa_symbol(&_text)); 38 39 #ifdef CONFIG_BLK_DEV_INITRD 40 /* Reserve INITRD */ 41 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { 42 /* Assume only end is not page aligned */ 43 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 44 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 45 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 46 memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image); 47 } 48 #endif 49 50 /* Call the subarch specific early setup function */ 51 switch (boot_params.hdr.hardware_subarch) { 52 case X86_SUBARCH_MRST: 53 x86_mrst_early_setup(); 54 break; 55 case X86_SUBARCH_CE4100: 56 x86_ce4100_early_setup(); 57 break; 58 default: 59 i386_default_early_setup(); 60 break; 61 } 62 63 /* 64 * At this point everything still needed from the boot loader 65 * or BIOS or kernel text should be early reserved or marked not 66 * RAM in e820. All other memory is free game. 67 */ 68 69 start_kernel(); 70 } 71