| /* |
| * linux/arch/i386/kernel/head32.c -- prepare to run common code |
| * |
| * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE |
| * Copyright (C) 2007 Eric Biederman <ebiederm@xmission.com> |
| */ |
| |
| #include <linux/init.h> |
| #include <linux/start_kernel.h> |
| #include <linux/mm.h> |
| |
| #include <asm/setup.h> |
| #include <asm/sections.h> |
| #include <asm/e820.h> |
| #include <asm/page.h> |
| #include <asm/trampoline.h> |
| #include <asm/apic.h> |
| #include <asm/io_apic.h> |
| #include <asm/bios_ebda.h> |
| |
| static void __init i386_default_early_setup(void) |
| { |
| /* Initialize 32bit specific setup functions */ |
| x86_init.resources.probe_roms = probe_roms; |
| x86_init.resources.reserve_resources = i386_reserve_resources; |
| x86_init.mpparse.setup_ioapic_ids = setup_ioapic_ids_from_mpc; |
| |
| reserve_ebda_region(); |
| } |
| |
| void __init i386_start_kernel(void) |
| { |
| #ifdef CONFIG_X86_TRAMPOLINE |
| /* |
| * But first pinch a few for the stack/trampoline stuff |
| * FIXME: Don't need the extra page at 4K, but need to fix |
| * trampoline before removing it. (see the GDT stuff) |
| */ |
| reserve_early_overlap_ok(PAGE_SIZE, PAGE_SIZE + PAGE_SIZE, |
| "EX TRAMPOLINE"); |
| #endif |
| |
| reserve_early(__pa_symbol(&_text), __pa_symbol(&__bss_stop), "TEXT DATA BSS"); |
| |
| #ifdef CONFIG_BLK_DEV_INITRD |
| /* Reserve INITRD */ |
| if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) { |
| /* Assume only end is not page aligned */ |
| u64 ramdisk_image = boot_params.hdr.ramdisk_image; |
| u64 ramdisk_size = boot_params.hdr.ramdisk_size; |
| u64 ramdisk_end = PAGE_ALIGN(ramdisk_image + ramdisk_size); |
| reserve_early(ramdisk_image, ramdisk_end, "RAMDISK"); |
| } |
| #endif |
| |
| /* Call the subarch specific early setup function */ |
| switch (boot_params.hdr.hardware_subarch) { |
| case X86_SUBARCH_MRST: |
| x86_mrst_early_setup(); |
| break; |
| default: |
| i386_default_early_setup(); |
| break; |
| } |
| |
| /* |
| * At this point everything still needed from the boot loader |
| * or BIOS or kernel text should be early reserved or marked not |
| * RAM in e820. All other memory is free game. |
| */ |
| |
| start_kernel(); |
| } |