17c478bd9Sstevel@tonic-gate/* boot.S - bootstrap the kernel */ 27c478bd9Sstevel@tonic-gate/* Copyright (C) 1999, 2001 Free Software Foundation, Inc. 37c478bd9Sstevel@tonic-gate 47c478bd9Sstevel@tonic-gate This program is free software; you can redistribute it and/or modify 57c478bd9Sstevel@tonic-gate it under the terms of the GNU General Public License as published by 67c478bd9Sstevel@tonic-gate the Free Software Foundation; either version 2 of the License, or 77c478bd9Sstevel@tonic-gate (at your option) any later version. 87c478bd9Sstevel@tonic-gate 97c478bd9Sstevel@tonic-gate This program is distributed in the hope that it will be useful, 107c478bd9Sstevel@tonic-gate but WITHOUT ANY WARRANTY; without even the implied warranty of 117c478bd9Sstevel@tonic-gate MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 127c478bd9Sstevel@tonic-gate GNU General Public License for more details. 137c478bd9Sstevel@tonic-gate 147c478bd9Sstevel@tonic-gate You should have received a copy of the GNU General Public License 157c478bd9Sstevel@tonic-gate along with this program; if not, write to the Free Software 167c478bd9Sstevel@tonic-gate Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ 177c478bd9Sstevel@tonic-gate 187c478bd9Sstevel@tonic-gate#define ASM 1 197c478bd9Sstevel@tonic-gate#include <multiboot.h> 207c478bd9Sstevel@tonic-gate 217c478bd9Sstevel@tonic-gate .text 227c478bd9Sstevel@tonic-gate 237c478bd9Sstevel@tonic-gate .globl start, _start 247c478bd9Sstevel@tonic-gatestart: 257c478bd9Sstevel@tonic-gate_start: 267c478bd9Sstevel@tonic-gate jmp multiboot_entry 277c478bd9Sstevel@tonic-gate 287c478bd9Sstevel@tonic-gate /* Align 32 bits boundary. */ 297c478bd9Sstevel@tonic-gate .align 4 307c478bd9Sstevel@tonic-gate 317c478bd9Sstevel@tonic-gate /* Multiboot header. */ 327c478bd9Sstevel@tonic-gatemultiboot_header: 337c478bd9Sstevel@tonic-gate /* magic */ 347c478bd9Sstevel@tonic-gate .long MULTIBOOT_HEADER_MAGIC 357c478bd9Sstevel@tonic-gate /* flags */ 367c478bd9Sstevel@tonic-gate .long MULTIBOOT_HEADER_FLAGS 377c478bd9Sstevel@tonic-gate /* checksum */ 387c478bd9Sstevel@tonic-gate .long -(MULTIBOOT_HEADER_MAGIC + MULTIBOOT_HEADER_FLAGS) 397c478bd9Sstevel@tonic-gate#ifndef __ELF__ 407c478bd9Sstevel@tonic-gate /* header_addr */ 417c478bd9Sstevel@tonic-gate .long multiboot_header 427c478bd9Sstevel@tonic-gate /* load_addr */ 437c478bd9Sstevel@tonic-gate .long _start 447c478bd9Sstevel@tonic-gate /* load_end_addr */ 457c478bd9Sstevel@tonic-gate .long _edata 467c478bd9Sstevel@tonic-gate /* bss_end_addr */ 477c478bd9Sstevel@tonic-gate .long _end 487c478bd9Sstevel@tonic-gate /* entry_addr */ 497c478bd9Sstevel@tonic-gate .long multiboot_entry 507c478bd9Sstevel@tonic-gate#endif /* ! __ELF__ */ 517c478bd9Sstevel@tonic-gate 527c478bd9Sstevel@tonic-gatemultiboot_entry: 537c478bd9Sstevel@tonic-gate /* Initialize the stack pointer. */ 547c478bd9Sstevel@tonic-gate movl $(stack + STACK_SIZE), %esp 557c478bd9Sstevel@tonic-gate 567c478bd9Sstevel@tonic-gate /* Reset EFLAGS. */ 577c478bd9Sstevel@tonic-gate pushl $0 587c478bd9Sstevel@tonic-gate popf 597c478bd9Sstevel@tonic-gate 607c478bd9Sstevel@tonic-gate /* Push the pointer to the Multiboot information structure. */ 617c478bd9Sstevel@tonic-gate pushl %ebx 627c478bd9Sstevel@tonic-gate /* Push the magic value. */ 637c478bd9Sstevel@tonic-gate pushl %eax 647c478bd9Sstevel@tonic-gate 657c478bd9Sstevel@tonic-gate /* Now enter the C main function... */ 667c478bd9Sstevel@tonic-gate call EXT_C(cmain) 677c478bd9Sstevel@tonic-gate 687c478bd9Sstevel@tonic-gate /* Halt. */ 697c478bd9Sstevel@tonic-gate pushl $halt_message 707c478bd9Sstevel@tonic-gate call EXT_C(printf) 717c478bd9Sstevel@tonic-gate 727c478bd9Sstevel@tonic-gateloop: hlt 737c478bd9Sstevel@tonic-gate jmp loop 747c478bd9Sstevel@tonic-gate 757c478bd9Sstevel@tonic-gatehalt_message: 767c478bd9Sstevel@tonic-gate .asciz "Halted." 777c478bd9Sstevel@tonic-gate 787c478bd9Sstevel@tonic-gate /* Our stack area. */ 797c478bd9Sstevel@tonic-gate .comm stack, STACK_SIZE 807c478bd9Sstevel@tonic-gate