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/trampoline.h> 18 #include <asm/apic.h> 19 #include <asm/io_apic.h> 20 #include <asm/bios_ebda.h> 21 22 static void __init i386_default_early_setup(void) 23 { 24 /* Initilize 32bit specific setup functions */ 25 x86_init.resources.probe_roms = probe_roms; 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 memblock_init(); 35 36 #ifdef CONFIG_X86_TRAMPOLINE 37 /* 38 * But first pinch a few for the stack/trampoline stuff 39 * FIXME: Don't need the extra page at 4K, but need to fix 40 * trampoline before removing it. (see the GDT stuff) 41 */ 42 memblock_x86_reserve_range(PAGE_SIZE, PAGE_SIZE + PAGE_SIZE, "EX TRAMPOLINE"); 43 #endif 44 45 memblock_x86_reserve_range(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS"); 46 47 #ifdef CONFIG_BLK_DEV_INITRD 48 /* Reserve INITRD */ 49 if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { 50 /* Assume only end is not page aligned */ 51 u64 ramdisk_image = boot_params.hdr.ramdisk_image; 52 u64 ramdisk_size = boot_params.hdr.ramdisk_size; 53 u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 54 memblock_x86_reserve_range(ramdisk_image, ramdisk_end, "RAMDISK"); 55 } 56 #endif 57 58 /* Call the subarch specific early setup function */ 59 switch (boot_params.hdr.hardware_subarch) { 60 case X86_SUBARCH_MRST: 61 x86_mrst_early_setup(); 62 break; 63 default: 64 i386_default_early_setup(); 65 break; 66 } 67 68 /* 69 * At this point everything still needed from the boot loader 70 * or BIOS or kernel text should be early reserved or marked not 71 * RAM in e820. All other memory is free game. 72 */ 73 74 start_kernel(); 75 } 76