17c478bd9Sstevel@tonic-gate /* 27c478bd9Sstevel@tonic-gate * GRUB -- GRand Unified Bootloader 37c478bd9Sstevel@tonic-gate * Copyright (C) 2000 Free Software Foundation, Inc. 47c478bd9Sstevel@tonic-gate * 57c478bd9Sstevel@tonic-gate * This program is free software; you can redistribute it and/or modify 67c478bd9Sstevel@tonic-gate * it under the terms of the GNU General Public License as published by 77c478bd9Sstevel@tonic-gate * the Free Software Foundation; either version 2 of the License, or 87c478bd9Sstevel@tonic-gate * (at your option) any later version. 97c478bd9Sstevel@tonic-gate * 107c478bd9Sstevel@tonic-gate * This program is distributed in the hope that it will be useful, 117c478bd9Sstevel@tonic-gate * but WITHOUT ANY WARRANTY; without even the implied warranty of 127c478bd9Sstevel@tonic-gate * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 137c478bd9Sstevel@tonic-gate * GNU General Public License for more details. 147c478bd9Sstevel@tonic-gate * 157c478bd9Sstevel@tonic-gate * You should have received a copy of the GNU General Public License 167c478bd9Sstevel@tonic-gate * along with this program; if not, write to the Free Software 177c478bd9Sstevel@tonic-gate * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 187c478bd9Sstevel@tonic-gate */ 197c478bd9Sstevel@tonic-gate 207c478bd9Sstevel@tonic-gate /* 217c478bd9Sstevel@tonic-gate * MultiBoot Header description 227c478bd9Sstevel@tonic-gate */ 237c478bd9Sstevel@tonic-gate 247c478bd9Sstevel@tonic-gate struct multiboot_header 257c478bd9Sstevel@tonic-gate { 267c478bd9Sstevel@tonic-gate /* Must be MULTIBOOT_MAGIC - see below. */ 277c478bd9Sstevel@tonic-gate unsigned magic; 287c478bd9Sstevel@tonic-gate 297c478bd9Sstevel@tonic-gate /* Feature flags - see below. */ 307c478bd9Sstevel@tonic-gate unsigned flags; 317c478bd9Sstevel@tonic-gate 327c478bd9Sstevel@tonic-gate /* 337c478bd9Sstevel@tonic-gate * Checksum 347c478bd9Sstevel@tonic-gate * 357c478bd9Sstevel@tonic-gate * The above fields plus this one must equal 0 mod 2^32. 367c478bd9Sstevel@tonic-gate */ 377c478bd9Sstevel@tonic-gate unsigned checksum; 387c478bd9Sstevel@tonic-gate 397c478bd9Sstevel@tonic-gate /* These are only valid if MULTIBOOT_AOUT_KLUDGE is set. */ 407c478bd9Sstevel@tonic-gate unsigned header_addr; 417c478bd9Sstevel@tonic-gate unsigned load_addr; 427c478bd9Sstevel@tonic-gate unsigned load_end_addr; 437c478bd9Sstevel@tonic-gate unsigned bss_end_addr; 447c478bd9Sstevel@tonic-gate unsigned entry_addr; 457c478bd9Sstevel@tonic-gate 467c478bd9Sstevel@tonic-gate /* These are only valid if MULTIBOOT_VIDEO_MODE is set. */ 477c478bd9Sstevel@tonic-gate unsigned mode_type; 487c478bd9Sstevel@tonic-gate unsigned width; 497c478bd9Sstevel@tonic-gate unsigned height; 507c478bd9Sstevel@tonic-gate unsigned depth; 517c478bd9Sstevel@tonic-gate }; 527c478bd9Sstevel@tonic-gate 537c478bd9Sstevel@tonic-gate /* 547c478bd9Sstevel@tonic-gate * The entire multiboot_header must be contained 557c478bd9Sstevel@tonic-gate * within the first MULTIBOOT_SEARCH bytes of the kernel image. 567c478bd9Sstevel@tonic-gate */ 577c478bd9Sstevel@tonic-gate #define MULTIBOOT_SEARCH 8192 587c478bd9Sstevel@tonic-gate #define MULTIBOOT_FOUND(addr, len) \ 597c478bd9Sstevel@tonic-gate (! ((addr) & 0x3) \ 607c478bd9Sstevel@tonic-gate && (len) >= 12 \ 617c478bd9Sstevel@tonic-gate && *((int *) (addr)) == MULTIBOOT_MAGIC \ 627c478bd9Sstevel@tonic-gate && ! (*((unsigned *) (addr)) + *((unsigned *) (addr + 4)) \ 637c478bd9Sstevel@tonic-gate + *((unsigned *) (addr + 8))) \ 647c478bd9Sstevel@tonic-gate && (! (MULTIBOOT_AOUT_KLUDGE & *((int *) (addr + 4))) || (len) >= 32) \ 657c478bd9Sstevel@tonic-gate && (! (MULTIBOOT_VIDEO_MODE & *((int *) (addr + 4))) || (len) >= 48)) 667c478bd9Sstevel@tonic-gate 677c478bd9Sstevel@tonic-gate /* Magic value identifying the multiboot_header. */ 687c478bd9Sstevel@tonic-gate #define MULTIBOOT_MAGIC 0x1BADB002 697c478bd9Sstevel@tonic-gate 707c478bd9Sstevel@tonic-gate /* 717c478bd9Sstevel@tonic-gate * Features flags for 'flags'. 727c478bd9Sstevel@tonic-gate * If a boot loader sees a flag in MULTIBOOT_MUSTKNOW set 737c478bd9Sstevel@tonic-gate * and it doesn't understand it, it must fail. 747c478bd9Sstevel@tonic-gate */ 757c478bd9Sstevel@tonic-gate #define MULTIBOOT_MUSTKNOW 0x0000FFFF 767c478bd9Sstevel@tonic-gate 777c478bd9Sstevel@tonic-gate /* currently unsupported flags... this is a kind of version number. */ 787c478bd9Sstevel@tonic-gate #define MULTIBOOT_UNSUPPORTED 0x0000FFF8 797c478bd9Sstevel@tonic-gate 807c478bd9Sstevel@tonic-gate /* Align all boot modules on i386 page (4KB) boundaries. */ 817c478bd9Sstevel@tonic-gate #define MULTIBOOT_PAGE_ALIGN 0x00000001 827c478bd9Sstevel@tonic-gate 837c478bd9Sstevel@tonic-gate /* Must pass memory information to OS. */ 847c478bd9Sstevel@tonic-gate #define MULTIBOOT_MEMORY_INFO 0x00000002 857c478bd9Sstevel@tonic-gate 867c478bd9Sstevel@tonic-gate /* Must pass video information to OS. */ 877c478bd9Sstevel@tonic-gate #define MULTIBOOT_VIDEO_MODE 0x00000004 887c478bd9Sstevel@tonic-gate 897c478bd9Sstevel@tonic-gate /* This flag indicates the use of the address fields in the header. */ 907c478bd9Sstevel@tonic-gate #define MULTIBOOT_AOUT_KLUDGE 0x00010000 91