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