/* -*-Asm-*- *//* *  GRUB  --  GRand Unified Bootloader *  Copyright (C) 2007,2008  Free Software Foundation, Inc. * *  GRUB is free software: you can redistribute it and/or modify *  it under the terms of the GNU General Public License as published by *  the Free Software Foundation, either version 3 of the License, or *  (at your option) any later version. * *  GRUB is distributed in the hope that it will be useful, *  but WITHOUT ANY WARRANTY; without even the implied warranty of *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the *  GNU General Public License for more details. * *  You should have received a copy of the GNU General Public License *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>. */#include <grub/boot.h>#include <grub/machine/boot.h>#include <grub/machine/kernel.h>#include <multiboot.h>        .file   "lnxboot.S"#define CODE_ADDR	0x6000#define CODE_LENG	(code_end - start)#define DATA_ADDR	((GRUB_BOOT_MACHINE_KERNEL_ADDR) + 0x200)#define BLCK_LENG	0x4000	.text        .code16        .globl  start, _startdata_start:	xorl	%ebp, %ebp	jmp	linux_next	. = data_start + 0x1F1setup_sects:	.byte	(CODE_LENG >> 9)root_flags:	.word	0syssize:	.word	0swap_dev:	.word	0ram_size:	.word	0vid_mode:	.word	0root_dev:	.word	0boot_flag:	.word	0xAA55start:_start:	jmp linux_init	.ascii	"HdrS"			/* Header signature.  */	.word	0x0203			/* Header version number.  */realmode_swtch:	.word	0, 0			/* default_switch, SETUPSEG.  */start_sys_seg:	.word	0x1000			/* Obsolete.  */version_ptr:	.word	0			/* Version string ptr.  */type_of_loader:	.byte	0			/* Filled in by boot loader.  */loadflags:	.byte	1			/* Please load high.  */setup_move_size:	.word	0			/* Unused.  */code32_start:	.long	0x100000		/* 32-bit start address.  */ramdisk_image:	.long	0			/* Loaded ramdisk image address.  */ramdisk_size:	.long	0			/* Size of loaded ramdisk.  */bootsect_kludge:	.word	0, 0heap_end_ptr:	.word	0pad1:	.word	0cmd_line_ptr:	.long	0			/* Command line.  */ramdisk_max:	.long	0xffffffff		/* Highest allowed ramdisk address.  */gdt:	.long	0, 0, 0, 0		/* Must be zero.  */	.word	0xffff			/* 64 K segment size.  */gdt_src1:	.byte	0, 0 ,0			/* Low 24 bits of source address.  */	.byte	0x93			/* Access rights.  */	.byte	0			/* Extended access rights.  */gdt_src2:	.byte	0			/* High 8 bits of source address.  */	.word	0xffff			/* 64 K segment size.  */gdt_dst1:	.byte	0, 0, 0			/* Low 24 bits of target address.  */	.byte	0x93			/* Access rights.  */	.byte	0			/* Extended access rights.  */gdt_dst2:	.byte	0			/* High 8 bits of source address.  */	.long	0, 0, 0, 0		/* More space for the BIOS.  */reg_edx:	.byte	0x80,0,0xFF,0xFFdata_leng:	.long	0linux_init:	movw	%cs:(reg_edx - start), %dx	movl	%cs:(code32_start - start), %ebplinux_next:	call	normalizenormalize:	popw	%bx	subw	$(normalize - start), %bx	shrw	$4, %bx	movw	%cs, %ax	addw	%bx, %ax	pushw	%ax	pushw	$(real_code - start)	lret				/* Jump to real_code.  */real_code:	subw	$0x20, %ax	movw	%ax, %ds	movw	(setup_sects - data_start), %cx	shlw	$7, %cx	/* Setup stack.  */	xorw	%si, %si	movw	%si, %ss	movw	$(CODE_ADDR), %sp	/* Move itself to 0:CODE_ADDR.  */	cld	movw	%cs, %ax	movw	%ax, %ds	movw	$(CODE_ADDR >> 4), %ax	movw	%ax, %es	movw	%si, %di	rep	movsl	ljmp	$(CODE_ADDR >> 4), $(real_code_2  - start)real_code_2:	xchgl	%ebp, %esi	orl	%esi, %esi	jnz	1f	movw	%ds, %si	shll	$4, %esi	addl	%ebp, %esi1:	pushw	%es	popw	%ds	movl	$0x200, %ecx	addl	%ecx, %esi	movl	$DATA_ADDR, %edi	call	move_memory	/* Check for multiboot signature.  */	cmpl	$MULTIBOOT_MAGIC, %ss:(DATA_ADDR + 0x50)	jz	1f	movl	(ramdisk_image - start), %esi	movl	(ramdisk_size - start), %ecx	movl	$(DATA_ADDR - 0x200), %edi	jmp	2f1:	movl	%ss:(DATA_ADDR + GRUB_KERNEL_MACHINE_COMPRESSED_SIZE), %ecx	addl	$(GRUB_KERNEL_MACHINE_RAW_SIZE - 0x200), %ecx2:	call	move_memory	movsbl	%dh, %eax	movl	%eax, %ss:(DATA_ADDR + GRUB_KERNEL_MACHINE_INSTALL_DOS_PART)	movsbl	(reg_edx + 2 - start), %eax	movl	%eax, %ss:(DATA_ADDR + GRUB_KERNEL_MACHINE_INSTALL_BSD_PART)	ljmp	$(DATA_ADDR >> 4), $0/* * Parameters: *   esi: source address *   edi: target address *   ecx: number of bytes */move_memory:	incl	%ecx	andb	$0xFE, %cl	pushw	%dx1:	pushl	%esi	pushl	%edi	pushl	%ecx	cmpl	$BLCK_LENG, %ecx	jbe	2f	movl	$BLCK_LENG, %ecx2:	pushl	%ecx	movl	%esi, %eax	movw	%si, (gdt_src1 - start)	shrl	$16, %eax	movb	%al, (gdt_src1 + 2 - start)	movb	%ah, (gdt_src2 - start)	movl	%edi, %eax	movw	%di, (gdt_dst1 - start)	shrl	$16, %eax	movb	%al, (gdt_dst1 + 2 - start)	movb	%ah, (gdt_dst2 - start)	movw	$(gdt - start), %si	movb	$0x87, %ah	shrw	$1, %cx	int	$0x15	popl	%eax	popl	%ecx	popl	%edi	popl	%esi	jnc	2f	movw	$(err_int15_msg - start), %si	jmp	fail2:	addl	%eax, %esi	addl	%eax, %edi	subl	%eax, %ecx	jnz	1b	popw	%dx	ret/* * Parameters: *   si: message */fail:	movb	$0x0e, %ah	xorw	%bx, %bx1:	lodsb	(%si), %al	int	$0x10	cmpb	$0, %al	jne	1b1:	jmp	1berr_int15_msg:	.ascii	"move memory fails\0"	. = (.  & (~0x1FF)) + 0x1FF	.byte	0code_end: