* Add Linux 2.6's bootsect.S to fix the sample kernel build.

build-kernel

@@ -33,6 +33,6 @@ gcc $LDFLAGS -o src/cacademo kernel/multiboot.o kernel/kernel.o src/cacademo.o c
 objcopy -O binary src/cacademo cacademo.boot
 
 # For further development: create floppy images using the kernel
-gcc -traditional -c -o bootsect.o /usr/src/linux/arch/i386/boot/bootsect.S
+gcc -traditional -c -o bootsect.o kernel/bootsect.S
 ld -Ttext 0x0 -s --oformat binary bootsect.o -o cacademo.img
 

kernel/Makefile.am

@@ -1,5 +1,7 @@
 # $Id: Makefile.am 326 2006-03-06 20:57:14Z sam $
 
+EXTRA_DIST = bootsect.S
+
 lib_LTLIBRARIES = $(libkernel_la)
 
 if USE_KERNEL

kernel/bootsect.S

@@ -0,0 +1,98 @@
+/*
+ *	bootsect.S		Copyright (C) 1991, 1992 Linus Torvalds
+ *
+ *	modified by Drew Eckhardt
+ *	modified by Bruce Evans (bde)
+ *	modified by Chris Noe (May 1999) (as86 -> gas)
+ *	gutted by H. Peter Anvin (Jan 2003)
+ *
+ * BIG FAT NOTE: We're in real mode using 64k segments.  Therefore segment
+ * addresses must be multiplied by 16 to obtain their respective linear
+ * addresses. To avoid confusion, linear addresses are written using leading
+ * hex while segment addresses are written as segment:offset.
+ *
+ */
+
+#include <asm/boot.h>
+
+SETUPSECTS	= 4			/* default nr of setup-sectors */
+BOOTSEG		= 0x07C0		/* original address of boot-sector */
+INITSEG		= DEF_INITSEG		/* we move boot here - out of the way */
+SETUPSEG	= DEF_SETUPSEG		/* setup starts here */
+SYSSEG		= DEF_SYSSEG		/* system loaded at 0x10000 (65536) */
+SYSSIZE		= DEF_SYSSIZE		/* system size: # of 16-byte clicks */
+					/* to be loaded */
+ROOT_DEV	= 0 			/* ROOT_DEV is now written by "build" */
+SWAP_DEV	= 0			/* SWAP_DEV is now written by "build" */
+
+#ifndef SVGA_MODE
+#define SVGA_MODE ASK_VGA
+#endif
+
+#ifndef RAMDISK
+#define RAMDISK 0
+#endif
+
+#ifndef ROOT_RDONLY
+#define ROOT_RDONLY 1
+#endif
+
+.code16
+.text
+
+.global _start
+_start:
+
+	# Normalize the start address
+	jmpl	$BOOTSEG, $start2
+
+start2:
+	movw	%cs, %ax
+	movw	%ax, %ds
+	movw	%ax, %es
+	movw	%ax, %ss
+	movw	$0x7c00, %sp
+	sti
+	cld
+
+	movw	$bugger_off_msg, %si
+
+msg_loop:
+	lodsb
+	andb	%al, %al
+	jz	die
+	movb	$0xe, %ah
+	movw	$7, %bx
+	int	$0x10
+	jmp	msg_loop
+
+die:
+	# Allow the user to press a key, then reboot
+	xorw	%ax, %ax
+	int	$0x16
+	int	$0x19
+
+	# int 0x19 should never return.  In case it does anyway,
+	# invoke the BIOS reset code...
+	ljmp	$0xf000,$0xfff0
+
+
+bugger_off_msg:
+	.ascii	"Direct booting from floppy is no longer supported.\r\n"
+	.ascii	"Please use a boot loader program instead.\r\n"
+	.ascii	"\n"
+	.ascii	"Remove disk and press any key to reboot . . .\r\n"
+	.byte	0
+
+
+	# Kernel attributes; used by setup
+
+	.org 497
+setup_sects:	.byte SETUPSECTS
+root_flags:	.word ROOT_RDONLY
+syssize:	.word SYSSIZE
+swap_dev:	.word SWAP_DEV
+ram_size:	.word RAMDISK
+vid_mode:	.word SVGA_MODE
+root_dev:	.word ROOT_DEV
+boot_flag:	.word 0xAA55