1700efc1bSEric W. Biederman /* 2700efc1bSEric W. Biederman * linux/arch/i386/kernel/head32.c -- prepare to run common code 3700efc1bSEric W. Biederman * 4700efc1bSEric W. Biederman * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE 5700efc1bSEric W. Biederman * Copyright (C) 2007 Eric Biederman <ebiederm@xmission.com> 6700efc1bSEric W. Biederman */ 7700efc1bSEric W. Biederman 8700efc1bSEric W. Biederman #include <linux/init.h> 9700efc1bSEric W. Biederman #include <linux/start_kernel.h> 10c967da6aSYinghai Lu #include <linux/mm.h> 1172d7c3b3SYinghai Lu #include <linux/memblock.h> 12700efc1bSEric W. Biederman 13a4c81cf6SYinghai Lu #include <asm/setup.h> 14a4c81cf6SYinghai Lu #include <asm/sections.h> 15a4c81cf6SYinghai Lu #include <asm/e820.h> 16816c25e7SThomas Gleixner #include <asm/page.h> 17de934103SThomas Gleixner #include <asm/apic.h> 18de934103SThomas Gleixner #include <asm/io_apic.h> 1947a3d5daSThomas Gleixner #include <asm/bios_ebda.h> 20b40827faSBorislav Petkov #include <asm/tlbflush.h> 215dcd14ecSH. Peter Anvin #include <asm/bootparam_utils.h> 2247a3d5daSThomas Gleixner 2347a3d5daSThomas Gleixner static void __init i386_default_early_setup(void) 2447a3d5daSThomas Gleixner { 25421f91d2SUwe Kleine-König /* Initialize 32bit specific setup functions */ 2647a3d5daSThomas Gleixner x86_init.resources.reserve_resources = i386_reserve_resources; 2747a3d5daSThomas Gleixner x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc; 2847a3d5daSThomas Gleixner 2947a3d5daSThomas Gleixner reserve_ebda_region(); 3047a3d5daSThomas Gleixner } 31a4c81cf6SYinghai Lu 32700efc1bSEric W. Biederman void __init i386_start_kernel(void) 33700efc1bSEric W. Biederman { 345dcd14ecSH. Peter Anvin sanitize_boot_params(&boot_params); 355dcd14ecSH. Peter Anvin 3624aa0788STejun Heo memblock_reserve(__pa_symbol(&_text), 3724aa0788STejun Heo __pa_symbol(&__bss_stop) - __pa_symbol(&_text)); 38a4c81cf6SYinghai Lu 39a4c81cf6SYinghai Lu #ifdef CONFIG_BLK_DEV_INITRD 40a4c81cf6SYinghai Lu /* Reserve INITRD */ 41a4c81cf6SYinghai Lu if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { 42c967da6aSYinghai Lu /* Assume only end is not page aligned */ 43a4c81cf6SYinghai Lu u64 ramdisk_image = boot_params.hdr.ramdisk_image; 44a4c81cf6SYinghai Lu u64 ramdisk_size = boot_params.hdr.ramdisk_size; 45c967da6aSYinghai Lu u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); 4624aa0788STejun Heo memblock_reserve(ramdisk_image, ramdisk_end - ramdisk_image); 47a4c81cf6SYinghai Lu } 48a4c81cf6SYinghai Lu #endif 49f7cf5a5bSThomas Gleixner 5047a3d5daSThomas Gleixner /* Call the subarch specific early setup function */ 5147a3d5daSThomas Gleixner switch (boot_params.hdr.hardware_subarch) { 523f4110a4SThomas Gleixner case X86_SUBARCH_MRST: 533f4110a4SThomas Gleixner x86_mrst_early_setup(); 543f4110a4SThomas Gleixner break; 55c751e17bSThomas Gleixner case X86_SUBARCH_CE4100: 56c751e17bSThomas Gleixner x86_ce4100_early_setup(); 57c751e17bSThomas Gleixner break; 5847a3d5daSThomas Gleixner default: 5947a3d5daSThomas Gleixner i386_default_early_setup(); 6047a3d5daSThomas Gleixner break; 6147a3d5daSThomas Gleixner } 62a4c81cf6SYinghai Lu 63a4c81cf6SYinghai Lu /* 64a4c81cf6SYinghai Lu * At this point everything still needed from the boot loader 65a4c81cf6SYinghai Lu * or BIOS or kernel text should be early reserved or marked not 66a4c81cf6SYinghai Lu * RAM in e820. All other memory is free game. 67a4c81cf6SYinghai Lu */ 68a4c81cf6SYinghai Lu 69700efc1bSEric W. Biederman start_kernel(); 70700efc1bSEric W. Biederman } 71