Use the new x86 setup code for x86-64; unify with i386
This unifies arch/*/boot (except arch/*/boot/compressed) between i386 and x86-64, and uses the new x86 setup code for x86-64 as well. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
H. Peter Anvin
Linus Torvalds
parent
4fd06960f1
commit
91a6c462b0
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@ -1,135 +1,9 @@
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#
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# arch/x86_64/boot/Makefile
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#
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# This file is subject to the terms and conditions of the GNU General Public
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# License. See the file "COPYING" in the main directory of this archive
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# for more details.
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#
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# Copyright (C) 1994 by Linus Torvalds
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#
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# The actual boot code is shared with i386 including the Makefile.
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# So tell kbuild that we fetch the code from i386 and include the
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# Makefile from i386 too.
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# ROOT_DEV specifies the default root-device when making the image.
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# This can be either FLOPPY, CURRENT, /dev/xxxx or empty, in which case
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# the default of FLOPPY is used by 'build'.
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ROOT_DEV := CURRENT
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# If you want to preset the SVGA mode, uncomment the next line and
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# set SVGA_MODE to whatever number you want.
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# Set it to -DSVGA_MODE=NORMAL_VGA if you just want the EGA/VGA mode.
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# The number is the same as you would ordinarily press at bootup.
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SVGA_MODE := -DSVGA_MODE=NORMAL_VGA
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# If you want the RAM disk device, define this to be the size in blocks.
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#RAMDISK := -DRAMDISK=512
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targets := vmlinux.bin bootsect bootsect.o \
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setup setup.o bzImage mtools.conf
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EXTRA_CFLAGS := -m32
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hostprogs-y := tools/build
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HOST_EXTRACFLAGS += $(LINUXINCLUDE)
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subdir- := compressed/ #Let make clean descend in compressed/
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# ---------------------------------------------------------------------------
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$(obj)/bzImage: IMAGE_OFFSET := 0x100000
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$(obj)/bzImage: EXTRA_AFLAGS := $(SVGA_MODE) $(RAMDISK) -D__BIG_KERNEL__
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$(obj)/bzImage: BUILDFLAGS := -b
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quiet_cmd_image = BUILD $@
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cmd_image = $(obj)/tools/build $(BUILDFLAGS) $(obj)/bootsect $(obj)/setup \
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$(obj)/vmlinux.bin $(ROOT_DEV) > $@
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$(obj)/bzImage: $(obj)/bootsect $(obj)/setup \
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$(obj)/vmlinux.bin $(obj)/tools/build FORCE
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$(call if_changed,image)
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@echo 'Kernel: $@ is ready' ' (#'`cat .version`')'
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$(obj)/vmlinux.bin: $(obj)/compressed/vmlinux FORCE
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$(call if_changed,objcopy)
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LDFLAGS_bootsect := -Ttext 0x0 -s --oformat binary
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LDFLAGS_setup := -Ttext 0x0 -s --oformat binary -e begtext
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$(obj)/setup $(obj)/bootsect: %: %.o FORCE
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$(call if_changed,ld)
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$(obj)/compressed/vmlinux: FORCE
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$(Q)$(MAKE) $(build)=$(obj)/compressed IMAGE_OFFSET=$(IMAGE_OFFSET) $@
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# Set this if you want to pass append arguments to the zdisk/fdimage/isoimage kernel
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FDARGS =
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# Set this if you want an initrd included with the zdisk/fdimage/isoimage kernel
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FDINITRD =
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image_cmdline = default linux $(FDARGS) $(if $(FDINITRD),initrd=initrd.img,)
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$(obj)/mtools.conf: $(src)/mtools.conf.in
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sed -e 's|@OBJ@|$(obj)|g' < $< > $@
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# This requires write access to /dev/fd0
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zdisk: $(BOOTIMAGE) $(obj)/mtools.conf
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MTOOLSRC=$(obj)/mtools.conf mformat a: ; sync
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syslinux /dev/fd0 ; sync
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echo '$(image_cmdline)' | \
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MTOOLSRC=$(obj)/mtools.conf mcopy - a:syslinux.cfg
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if [ -f '$(FDINITRD)' ] ; then \
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MTOOLSRC=$(obj)/mtools.conf mcopy '$(FDINITRD)' a:initrd.img ; \
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fi
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MTOOLSRC=$(obj)/mtools.conf mcopy $(BOOTIMAGE) a:linux ; sync
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# These require being root or having syslinux 2.02 or higher installed
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fdimage fdimage144: $(BOOTIMAGE) $(obj)/mtools.conf
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dd if=/dev/zero of=$(obj)/fdimage bs=1024 count=1440
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MTOOLSRC=$(obj)/mtools.conf mformat v: ; sync
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syslinux $(obj)/fdimage ; sync
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echo '$(image_cmdline)' | \
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MTOOLSRC=$(obj)/mtools.conf mcopy - v:syslinux.cfg
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if [ -f '$(FDINITRD)' ] ; then \
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MTOOLSRC=$(obj)/mtools.conf mcopy '$(FDINITRD)' v:initrd.img ; \
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fi
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MTOOLSRC=$(obj)/mtools.conf mcopy $(BOOTIMAGE) v:linux ; sync
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fdimage288: $(BOOTIMAGE) $(obj)/mtools.conf
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dd if=/dev/zero of=$(obj)/fdimage bs=1024 count=2880
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MTOOLSRC=$(obj)/mtools.conf mformat w: ; sync
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syslinux $(obj)/fdimage ; sync
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echo '$(image_cmdline)' | \
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MTOOLSRC=$(obj)/mtools.conf mcopy - w:syslinux.cfg
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if [ -f '$(FDINITRD)' ] ; then \
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MTOOLSRC=$(obj)/mtools.conf mcopy '$(FDINITRD)' w:initrd.img ; \
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fi
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MTOOLSRC=$(obj)/mtools.conf mcopy $(BOOTIMAGE) w:linux ; sync
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isoimage: $(BOOTIMAGE)
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-rm -rf $(obj)/isoimage
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mkdir $(obj)/isoimage
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for i in lib lib64 share end ; do \
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if [ -f /usr/$$i/syslinux/isolinux.bin ] ; then \
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cp /usr/$$i/syslinux/isolinux.bin $(obj)/isoimage ; \
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break ; \
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fi ; \
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if [ $$i = end ] ; then exit 1 ; fi ; \
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done
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cp $(BOOTIMAGE) $(obj)/isoimage/linux
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echo '$(image_cmdline)' > $(obj)/isoimage/isolinux.cfg
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if [ -f '$(FDINITRD)' ] ; then \
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cp '$(FDINITRD)' $(obj)/isoimage/initrd.img ; \
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fi
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mkisofs -J -r -o $(obj)/image.iso -b isolinux.bin -c boot.cat \
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-no-emul-boot -boot-load-size 4 -boot-info-table \
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$(obj)/isoimage
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rm -rf $(obj)/isoimage
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zlilo: $(BOOTIMAGE)
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if [ -f $(INSTALL_PATH)/vmlinuz ]; then mv $(INSTALL_PATH)/vmlinuz $(INSTALL_PATH)/vmlinuz.old; fi
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if [ -f $(INSTALL_PATH)/System.map ]; then mv $(INSTALL_PATH)/System.map $(INSTALL_PATH)/System.old; fi
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cat $(BOOTIMAGE) > $(INSTALL_PATH)/vmlinuz
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cp System.map $(INSTALL_PATH)/
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if [ -x /sbin/lilo ]; then /sbin/lilo; else /etc/lilo/install; fi
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install:
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sh $(srctree)/$(src)/install.sh $(KERNELRELEASE) $(BOOTIMAGE) System.map "$(INSTALL_PATH)"
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src := arch/i386/boot
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include $(src)/Makefile
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@ -1,98 +0,0 @@
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/*
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* bootsect.S Copyright (C) 1991, 1992 Linus Torvalds
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*
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* modified by Drew Eckhardt
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* modified by Bruce Evans (bde)
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* modified by Chris Noe (May 1999) (as86 -> gas)
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* gutted by H. Peter Anvin (Jan 2003)
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*
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* BIG FAT NOTE: We're in real mode using 64k segments. Therefore segment
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* addresses must be multiplied by 16 to obtain their respective linear
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* addresses. To avoid confusion, linear addresses are written using leading
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* hex while segment addresses are written as segment:offset.
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*
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*/
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#include <asm/boot.h>
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SETUPSECTS = 4 /* default nr of setup-sectors */
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BOOTSEG = 0x07C0 /* original address of boot-sector */
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INITSEG = DEF_INITSEG /* we move boot here - out of the way */
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SETUPSEG = DEF_SETUPSEG /* setup starts here */
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SYSSEG = DEF_SYSSEG /* system loaded at 0x10000 (65536) */
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SYSSIZE = DEF_SYSSIZE /* system size: # of 16-byte clicks */
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/* to be loaded */
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ROOT_DEV = 0 /* ROOT_DEV is now written by "build" */
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SWAP_DEV = 0 /* SWAP_DEV is now written by "build" */
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#ifndef SVGA_MODE
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#define SVGA_MODE ASK_VGA
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#endif
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#ifndef RAMDISK
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#define RAMDISK 0
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#endif
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#ifndef ROOT_RDONLY
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#define ROOT_RDONLY 1
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#endif
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.code16
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.text
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.global _start
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_start:
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# Normalize the start address
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jmpl $BOOTSEG, $start2
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start2:
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movw %cs, %ax
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %ss
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movw $0x7c00, %sp
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sti
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cld
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movw $bugger_off_msg, %si
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msg_loop:
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lodsb
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andb %al, %al
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jz die
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movb $0xe, %ah
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movw $7, %bx
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int $0x10
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jmp msg_loop
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die:
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# Allow the user to press a key, then reboot
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xorw %ax, %ax
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int $0x16
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int $0x19
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# int 0x19 should never return. In case it does anyway,
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# invoke the BIOS reset code...
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ljmp $0xf000,$0xfff0
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bugger_off_msg:
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.ascii "Direct booting from floppy is no longer supported.\r\n"
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.ascii "Please use a boot loader program instead.\r\n"
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.ascii "\n"
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.ascii "Remove disk and press any key to reboot . . .\r\n"
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.byte 0
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# Kernel attributes; used by setup
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.org 497
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setup_sects: .byte SETUPSECTS
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root_flags: .word ROOT_RDONLY
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syssize: .word SYSSIZE
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swap_dev: .word SWAP_DEV
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ram_size: .word RAMDISK
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vid_mode: .word SVGA_MODE
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root_dev: .word ROOT_DEV
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boot_flag: .word 0xAA55
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@ -7,11 +7,12 @@
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#
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targets := vmlinux vmlinux.bin vmlinux.bin.gz head.o misc.o piggy.o
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EXTRA_AFLAGS := -traditional
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# cannot use EXTRA_CFLAGS because base CFLAGS contains -mkernel which conflicts with
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# -m32
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CFLAGS := -m64 -D__KERNEL__ -Iinclude -O2 -fno-strict-aliasing -fPIC -mcmodel=small -fno-builtin
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CFLAGS := -m64 -D__KERNEL__ $(LINUXINCLUDE) -O2 \
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-fno-strict-aliasing -fPIC -mcmodel=small \
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$(call cc-option, -ffreestanding) \
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$(call cc-option, -fno-stack-protector)
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AFLAGS := $(CFLAGS) -D__ASSEMBLY__
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LDFLAGS := -m elf_x86_64
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LDFLAGS_vmlinux := -T
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@ -1,2 +0,0 @@
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#!/bin/sh
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. $srctree/arch/i386/boot/install.sh
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@ -1,17 +0,0 @@
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#
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# mtools configuration file for "make (b)zdisk"
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#
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# Actual floppy drive
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drive a:
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file="/dev/fd0"
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# 1.44 MB floppy disk image
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drive v:
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file="@OBJ@/fdimage" cylinders=80 heads=2 sectors=18 filter
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# 2.88 MB floppy disk image (mostly for virtual uses)
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drive w:
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file="@OBJ@/fdimage" cylinders=80 heads=2 sectors=36 filter
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@ -1,826 +0,0 @@
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/*
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* setup.S Copyright (C) 1991, 1992 Linus Torvalds
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*
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* setup.s is responsible for getting the system data from the BIOS,
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* and putting them into the appropriate places in system memory.
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* both setup.s and system has been loaded by the bootblock.
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*
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* This code asks the bios for memory/disk/other parameters, and
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* puts them in a "safe" place: 0x90000-0x901FF, ie where the
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* boot-block used to be. It is then up to the protected mode
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* system to read them from there before the area is overwritten
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* for buffer-blocks.
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*
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* Move PS/2 aux init code to psaux.c
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* (troyer@saifr00.cfsat.Honeywell.COM) 03Oct92
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*
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* some changes and additional features by Christoph Niemann,
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* March 1993/June 1994 (Christoph.Niemann@linux.org)
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*
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* add APM BIOS checking by Stephen Rothwell, May 1994
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* (sfr@canb.auug.org.au)
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*
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* High load stuff, initrd support and position independency
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* by Hans Lermen & Werner Almesberger, February 1996
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* <lermen@elserv.ffm.fgan.de>, <almesber@lrc.epfl.ch>
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*
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* Video handling moved to video.S by Martin Mares, March 1996
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* <mj@k332.feld.cvut.cz>
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*
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* Extended memory detection scheme retwiddled by orc@pell.chi.il.us (david
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* parsons) to avoid loadlin confusion, July 1997
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*
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* Transcribed from Intel (as86) -> AT&T (gas) by Chris Noe, May 1999.
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* <stiker@northlink.com>
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*
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* Fix to work around buggy BIOSes which don't use carry bit correctly
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* and/or report extended memory in CX/DX for e801h memory size detection
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* call. As a result the kernel got wrong figures. The int15/e801h docs
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* from Ralf Brown interrupt list seem to indicate AX/BX should be used
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* anyway. So to avoid breaking many machines (presumably there was a reason
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* to orginally use CX/DX instead of AX/BX), we do a kludge to see
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* if CX/DX have been changed in the e801 call and if so use AX/BX .
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* Michael Miller, April 2001 <michaelm@mjmm.org>
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*
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* Added long mode checking and SSE force. March 2003, Andi Kleen.
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*/
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#include <asm/segment.h>
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#include <linux/utsrelease.h>
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#include <linux/compile.h>
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#include <asm/boot.h>
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#include <asm/e820.h>
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#include <asm/page.h>
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#include <asm/setup.h>
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/* Signature words to ensure LILO loaded us right */
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#define SIG1 0xAA55
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#define SIG2 0x5A5A
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INITSEG = DEF_INITSEG # 0x9000, we move boot here, out of the way
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SYSSEG = DEF_SYSSEG # 0x1000, system loaded at 0x10000 (65536).
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SETUPSEG = DEF_SETUPSEG # 0x9020, this is the current segment
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# ... and the former contents of CS
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DELTA_INITSEG = SETUPSEG - INITSEG # 0x0020
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.code16
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.globl begtext, begdata, begbss, endtext, enddata, endbss
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.text
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begtext:
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.data
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begdata:
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.bss
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begbss:
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.text
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start:
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jmp trampoline
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# This is the setup header, and it must start at %cs:2 (old 0x9020:2)
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.ascii "HdrS" # header signature
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.word 0x0206 # header version number (>= 0x0105)
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# or else old loadlin-1.5 will fail)
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realmode_swtch: .word 0, 0 # default_switch, SETUPSEG
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start_sys_seg: .word SYSSEG
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.word kernel_version # pointing to kernel version string
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# above section of header is compatible
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# with loadlin-1.5 (header v1.5). Don't
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# change it.
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type_of_loader: .byte 0 # = 0, old one (LILO, Loadlin,
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# Bootlin, SYSLX, bootsect...)
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# See Documentation/i386/boot.txt for
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# assigned ids
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# flags, unused bits must be zero (RFU) bit within loadflags
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loadflags:
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LOADED_HIGH = 1 # If set, the kernel is loaded high
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CAN_USE_HEAP = 0x80 # If set, the loader also has set
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# heap_end_ptr to tell how much
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# space behind setup.S can be used for
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# heap purposes.
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# Only the loader knows what is free
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#ifndef __BIG_KERNEL__
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.byte 0
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#else
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.byte LOADED_HIGH
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#endif
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setup_move_size: .word 0x8000 # size to move, when setup is not
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# loaded at 0x90000. We will move setup
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# to 0x90000 then just before jumping
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# into the kernel. However, only the
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# loader knows how much data behind
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# us also needs to be loaded.
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code32_start: # here loaders can put a different
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# start address for 32-bit code.
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#ifndef __BIG_KERNEL__
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.long 0x1000 # 0x1000 = default for zImage
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#else
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.long 0x100000 # 0x100000 = default for big kernel
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#endif
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ramdisk_image: .long 0 # address of loaded ramdisk image
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# Here the loader puts the 32-bit
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# address where it loaded the image.
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# This only will be read by the kernel.
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ramdisk_size: .long 0 # its size in bytes
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bootsect_kludge:
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.long 0 # obsolete
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heap_end_ptr: .word modelist+1024 # (Header version 0x0201 or later)
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# space from here (exclusive) down to
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# end of setup code can be used by setup
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# for local heap purposes.
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pad1: .word 0
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cmd_line_ptr: .long 0 # (Header version 0x0202 or later)
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# If nonzero, a 32-bit pointer
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# to the kernel command line.
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# The command line should be
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# located between the start of
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# setup and the end of low
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# memory (0xa0000), or it may
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# get overwritten before it
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# gets read. If this field is
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# used, there is no longer
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# anything magical about the
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# 0x90000 segment; the setup
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# can be located anywhere in
|
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# low memory 0x10000 or higher.
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ramdisk_max: .long 0xffffffff
|
||||
kernel_alignment: .long 0x200000 # physical addr alignment required for
|
||||
# protected mode relocatable kernel
|
||||
#ifdef CONFIG_RELOCATABLE
|
||||
relocatable_kernel: .byte 1
|
||||
#else
|
||||
relocatable_kernel: .byte 0
|
||||
#endif
|
||||
pad2: .byte 0
|
||||
pad3: .word 0
|
||||
|
||||
cmdline_size: .long COMMAND_LINE_SIZE-1 #length of the command line,
|
||||
#added with boot protocol
|
||||
#version 2.06
|
||||
|
||||
trampoline: call start_of_setup
|
||||
.align 16
|
||||
# The offset at this point is 0x240
|
||||
.space (0xeff-0x240+1) # E820 & EDD space (ending at 0xeff)
|
||||
# End of setup header #####################################################
|
||||
|
||||
start_of_setup:
|
||||
# Bootlin depends on this being done early
|
||||
movw $0x01500, %ax
|
||||
movb $0x81, %dl
|
||||
int $0x13
|
||||
|
||||
#ifdef SAFE_RESET_DISK_CONTROLLER
|
||||
# Reset the disk controller.
|
||||
movw $0x0000, %ax
|
||||
movb $0x80, %dl
|
||||
int $0x13
|
||||
#endif
|
||||
|
||||
# Set %ds = %cs, we know that SETUPSEG = %cs at this point
|
||||
movw %cs, %ax # aka SETUPSEG
|
||||
movw %ax, %ds
|
||||
# Check signature at end of setup
|
||||
cmpw $SIG1, setup_sig1
|
||||
jne bad_sig
|
||||
|
||||
cmpw $SIG2, setup_sig2
|
||||
jne bad_sig
|
||||
|
||||
jmp good_sig1
|
||||
|
||||
# Routine to print asciiz string at ds:si
|
||||
prtstr:
|
||||
lodsb
|
||||
andb %al, %al
|
||||
jz fin
|
||||
|
||||
call prtchr
|
||||
jmp prtstr
|
||||
|
||||
fin: ret
|
||||
|
||||
# Space printing
|
||||
prtsp2: call prtspc # Print double space
|
||||
prtspc: movb $0x20, %al # Print single space (note: fall-thru)
|
||||
|
||||
prtchr:
|
||||
pushw %ax
|
||||
pushw %cx
|
||||
movw $0007,%bx
|
||||
movw $0x01, %cx
|
||||
movb $0x0e, %ah
|
||||
int $0x10
|
||||
popw %cx
|
||||
popw %ax
|
||||
ret
|
||||
|
||||
beep: movb $0x07, %al
|
||||
jmp prtchr
|
||||
|
||||
no_sig_mess: .string "No setup signature found ..."
|
||||
|
||||
good_sig1:
|
||||
jmp good_sig
|
||||
|
||||
# We now have to find the rest of the setup code/data
|
||||
bad_sig:
|
||||
movw %cs, %ax # SETUPSEG
|
||||
subw $DELTA_INITSEG, %ax # INITSEG
|
||||
movw %ax, %ds
|
||||
xorb %bh, %bh
|
||||
movb (497), %bl # get setup sect from bootsect
|
||||
subw $4, %bx # LILO loads 4 sectors of setup
|
||||
shlw $8, %bx # convert to words (1sect=2^8 words)
|
||||
movw %bx, %cx
|
||||
shrw $3, %bx # convert to segment
|
||||
addw $SYSSEG, %bx
|
||||
movw %bx, %cs:start_sys_seg
|
||||
# Move rest of setup code/data to here
|
||||
movw $2048, %di # four sectors loaded by LILO
|
||||
subw %si, %si
|
||||
movw %cs, %ax # aka SETUPSEG
|
||||
movw %ax, %es
|
||||
movw $SYSSEG, %ax
|
||||
movw %ax, %ds
|
||||
rep
|
||||
movsw
|
||||
movw %cs, %ax # aka SETUPSEG
|
||||
movw %ax, %ds
|
||||
cmpw $SIG1, setup_sig1
|
||||
jne no_sig
|
||||
|
||||
cmpw $SIG2, setup_sig2
|
||||
jne no_sig
|
||||
|
||||
jmp good_sig
|
||||
|
||||
no_sig:
|
||||
lea no_sig_mess, %si
|
||||
call prtstr
|
||||
|
||||
no_sig_loop:
|
||||
jmp no_sig_loop
|
||||
|
||||
good_sig:
|
||||
movw %cs, %ax # aka SETUPSEG
|
||||
subw $DELTA_INITSEG, %ax # aka INITSEG
|
||||
movw %ax, %ds
|
||||
# Check if an old loader tries to load a big-kernel
|
||||
testb $LOADED_HIGH, %cs:loadflags # Do we have a big kernel?
|
||||
jz loader_ok # No, no danger for old loaders.
|
||||
|
||||
cmpb $0, %cs:type_of_loader # Do we have a loader that
|
||||
# can deal with us?
|
||||
jnz loader_ok # Yes, continue.
|
||||
|
||||
pushw %cs # No, we have an old loader,
|
||||
popw %ds # die.
|
||||
lea loader_panic_mess, %si
|
||||
call prtstr
|
||||
|
||||
jmp no_sig_loop
|
||||
|
||||
loader_panic_mess: .string "Wrong loader, giving up..."
|
||||
|
||||
loader_ok:
|
||||
/* check for long mode. */
|
||||
/* we have to do this before the VESA setup, otherwise the user
|
||||
can't see the error message. */
|
||||
|
||||
pushw %ds
|
||||
movw %cs,%ax
|
||||
movw %ax,%ds
|
||||
|
||||
call verify_cpu
|
||||
testl %eax,%eax
|
||||
jz sse_ok
|
||||
|
||||
no_longmode:
|
||||
call beep
|
||||
lea long_mode_panic,%si
|
||||
call prtstr
|
||||
no_longmode_loop:
|
||||
jmp no_longmode_loop
|
||||
long_mode_panic:
|
||||
.string "Your CPU does not support long mode. Use a 32bit distribution."
|
||||
.byte 0
|
||||
|
||||
#include "../kernel/verify_cpu.S"
|
||||
sse_ok:
|
||||
popw %ds
|
||||
|
||||
# tell BIOS we want to go to long mode
|
||||
movl $0xec00,%eax # declare target operating mode
|
||||
movl $2,%ebx # long mode
|
||||
int $0x15
|
||||
|
||||
# Get memory size (extended mem, kB)
|
||||
|
||||
xorl %eax, %eax
|
||||
movl %eax, (0x1e0)
|
||||
#ifndef STANDARD_MEMORY_BIOS_CALL
|
||||
movb %al, (E820NR)
|
||||
# Try three different memory detection schemes. First, try
|
||||
# e820h, which lets us assemble a memory map, then try e801h,
|
||||
# which returns a 32-bit memory size, and finally 88h, which
|
||||
# returns 0-64m
|
||||
|
||||
# method E820H:
|
||||
# the memory map from hell. e820h returns memory classified into
|
||||
# a whole bunch of different types, and allows memory holes and
|
||||
# everything. We scan through this memory map and build a list
|
||||
# of the first 32 memory areas, which we return at [E820MAP].
|
||||
# This is documented at http://www.acpi.info/, in the ACPI 2.0 specification.
|
||||
|
||||
#define SMAP 0x534d4150
|
||||
|
||||
meme820:
|
||||
xorl %ebx, %ebx # continuation counter
|
||||
movw $E820MAP, %di # point into the whitelist
|
||||
# so we can have the bios
|
||||
# directly write into it.
|
||||
|
||||
jmpe820:
|
||||
movl $0x0000e820, %eax # e820, upper word zeroed
|
||||
movl $SMAP, %edx # ascii 'SMAP'
|
||||
movl $20, %ecx # size of the e820rec
|
||||
pushw %ds # data record.
|
||||
popw %es
|
||||
int $0x15 # make the call
|
||||
jc bail820 # fall to e801 if it fails
|
||||
|
||||
cmpl $SMAP, %eax # check the return is `SMAP'
|
||||
jne bail820 # fall to e801 if it fails
|
||||
|
||||
# cmpl $1, 16(%di) # is this usable memory?
|
||||
# jne again820
|
||||
|
||||
# If this is usable memory, we save it by simply advancing %di by
|
||||
# sizeof(e820rec).
|
||||
#
|
||||
good820:
|
||||
movb (E820NR), %al # up to 128 entries
|
||||
cmpb $E820MAX, %al
|
||||
jae bail820
|
||||
|
||||
incb (E820NR)
|
||||
movw %di, %ax
|
||||
addw $20, %ax
|
||||
movw %ax, %di
|
||||
again820:
|
||||
cmpl $0, %ebx # check to see if
|
||||
jne jmpe820 # %ebx is set to EOF
|
||||
bail820:
|
||||
|
||||
|
||||
# method E801H:
|
||||
# memory size is in 1k chunksizes, to avoid confusing loadlin.
|
||||
# we store the 0xe801 memory size in a completely different place,
|
||||
# because it will most likely be longer than 16 bits.
|
||||
# (use 1e0 because that's what Larry Augustine uses in his
|
||||
# alternative new memory detection scheme, and it's sensible
|
||||
# to write everything into the same place.)
|
||||
|
||||
meme801:
|
||||
stc # fix to work around buggy
|
||||
xorw %cx,%cx # BIOSes which don't clear/set
|
||||
xorw %dx,%dx # carry on pass/error of
|
||||
# e801h memory size call
|
||||
# or merely pass cx,dx though
|
||||
# without changing them.
|
||||
movw $0xe801, %ax
|
||||
int $0x15
|
||||
jc mem88
|
||||
|
||||
cmpw $0x0, %cx # Kludge to handle BIOSes
|
||||
jne e801usecxdx # which report their extended
|
||||
cmpw $0x0, %dx # memory in AX/BX rather than
|
||||
jne e801usecxdx # CX/DX. The spec I have read
|
||||
movw %ax, %cx # seems to indicate AX/BX
|
||||
movw %bx, %dx # are more reasonable anyway...
|
||||
|
||||
e801usecxdx:
|
||||
andl $0xffff, %edx # clear sign extend
|
||||
shll $6, %edx # and go from 64k to 1k chunks
|
||||
movl %edx, (0x1e0) # store extended memory size
|
||||
andl $0xffff, %ecx # clear sign extend
|
||||
addl %ecx, (0x1e0) # and add lower memory into
|
||||
# total size.
|
||||
|
||||
# Ye Olde Traditional Methode. Returns the memory size (up to 16mb or
|
||||
# 64mb, depending on the bios) in ax.
|
||||
mem88:
|
||||
|
||||
#endif
|
||||
movb $0x88, %ah
|
||||
int $0x15
|
||||
movw %ax, (2)
|
||||
|
||||
# Set the keyboard repeat rate to the max
|
||||
movw $0x0305, %ax
|
||||
xorw %bx, %bx
|
||||
int $0x16
|
||||
|
||||
# Check for video adapter and its parameters and allow the
|
||||
# user to browse video modes.
|
||||
call video # NOTE: we need %ds pointing
|
||||
# to bootsector
|
||||
|
||||
# Get hd0 data...
|
||||
xorw %ax, %ax
|
||||
movw %ax, %ds
|
||||
ldsw (4 * 0x41), %si
|
||||
movw %cs, %ax # aka SETUPSEG
|
||||
subw $DELTA_INITSEG, %ax # aka INITSEG
|
||||
pushw %ax
|
||||
movw %ax, %es
|
||||
movw $0x0080, %di
|
||||
movw $0x10, %cx
|
||||
pushw %cx
|
||||
cld
|
||||
rep
|
||||
movsb
|
||||
# Get hd1 data...
|
||||
xorw %ax, %ax
|
||||
movw %ax, %ds
|
||||
ldsw (4 * 0x46), %si
|
||||
popw %cx
|
||||
popw %es
|
||||
movw $0x0090, %di
|
||||
rep
|
||||
movsb
|
||||
# Check that there IS a hd1 :-)
|
||||
movw $0x01500, %ax
|
||||
movb $0x81, %dl
|
||||
int $0x13
|
||||
jc no_disk1
|
||||
|
||||
cmpb $3, %ah
|
||||
je is_disk1
|
||||
|
||||
no_disk1:
|
||||
movw %cs, %ax # aka SETUPSEG
|
||||
subw $DELTA_INITSEG, %ax # aka INITSEG
|
||||
movw %ax, %es
|
||||
movw $0x0090, %di
|
||||
movw $0x10, %cx
|
||||
xorw %ax, %ax
|
||||
cld
|
||||
rep
|
||||
stosb
|
||||
is_disk1:
|
||||
|
||||
# Check for PS/2 pointing device
|
||||
movw %cs, %ax # aka SETUPSEG
|
||||
subw $DELTA_INITSEG, %ax # aka INITSEG
|
||||
movw %ax, %ds
|
||||
movb $0, (0x1ff) # default is no pointing device
|
||||
int $0x11 # int 0x11: equipment list
|
||||
testb $0x04, %al # check if mouse installed
|
||||
jz no_psmouse
|
||||
|
||||
movb $0xAA, (0x1ff) # device present
|
||||
no_psmouse:
|
||||
|
||||
#include "../../i386/boot/edd.S"
|
||||
|
||||
# Now we want to move to protected mode ...
|
||||
cmpw $0, %cs:realmode_swtch
|
||||
jz rmodeswtch_normal
|
||||
|
||||
lcall *%cs:realmode_swtch
|
||||
|
||||
jmp rmodeswtch_end
|
||||
|
||||
rmodeswtch_normal:
|
||||
pushw %cs
|
||||
call default_switch
|
||||
|
||||
rmodeswtch_end:
|
||||
# we get the code32 start address and modify the below 'jmpi'
|
||||
# (loader may have changed it)
|
||||
movl %cs:code32_start, %eax
|
||||
movl %eax, %cs:code32
|
||||
|
||||
# Now we move the system to its rightful place ... but we check if we have a
|
||||
# big-kernel. In that case we *must* not move it ...
|
||||
testb $LOADED_HIGH, %cs:loadflags
|
||||
jz do_move0 # .. then we have a normal low
|
||||
# loaded zImage
|
||||
# .. or else we have a high
|
||||
# loaded bzImage
|
||||
jmp end_move # ... and we skip moving
|
||||
|
||||
do_move0:
|
||||
movw $0x100, %ax # start of destination segment
|
||||
movw %cs, %bp # aka SETUPSEG
|
||||
subw $DELTA_INITSEG, %bp # aka INITSEG
|
||||
movw %cs:start_sys_seg, %bx # start of source segment
|
||||
cld
|
||||
do_move:
|
||||
movw %ax, %es # destination segment
|
||||
incb %ah # instead of add ax,#0x100
|
||||
movw %bx, %ds # source segment
|
||||
addw $0x100, %bx
|
||||
subw %di, %di
|
||||
subw %si, %si
|
||||
movw $0x800, %cx
|
||||
rep
|
||||
movsw
|
||||
cmpw %bp, %bx # assume start_sys_seg > 0x200,
|
||||
# so we will perhaps read one
|
||||
# page more than needed, but
|
||||
# never overwrite INITSEG
|
||||
# because destination is a
|
||||
# minimum one page below source
|
||||
jb do_move
|
||||
|
||||
end_move:
|
||||
# then we load the segment descriptors
|
||||
movw %cs, %ax # aka SETUPSEG
|
||||
movw %ax, %ds
|
||||
|
||||
# Check whether we need to be downward compatible with version <=201
|
||||
cmpl $0, cmd_line_ptr
|
||||
jne end_move_self # loader uses version >=202 features
|
||||
cmpb $0x20, type_of_loader
|
||||
je end_move_self # bootsect loader, we know of it
|
||||
|
||||
# Boot loader doesnt support boot protocol version 2.02.
|
||||
# If we have our code not at 0x90000, we need to move it there now.
|
||||
# We also then need to move the params behind it (commandline)
|
||||
# Because we would overwrite the code on the current IP, we move
|
||||
# it in two steps, jumping high after the first one.
|
||||
movw %cs, %ax
|
||||
cmpw $SETUPSEG, %ax
|
||||
je end_move_self
|
||||
|
||||
cli # make sure we really have
|
||||
# interrupts disabled !
|
||||
# because after this the stack
|
||||
# should not be used
|
||||
subw $DELTA_INITSEG, %ax # aka INITSEG
|
||||
movw %ss, %dx
|
||||
cmpw %ax, %dx
|
||||
jb move_self_1
|
||||
|
||||
addw $INITSEG, %dx
|
||||
subw %ax, %dx # this will go into %ss after
|
||||
# the move
|
||||
move_self_1:
|
||||
movw %ax, %ds
|
||||
movw $INITSEG, %ax # real INITSEG
|
||||
movw %ax, %es
|
||||
movw %cs:setup_move_size, %cx
|
||||
std # we have to move up, so we use
|
||||
# direction down because the
|
||||
# areas may overlap
|
||||
movw %cx, %di
|
||||
decw %di
|
||||
movw %di, %si
|
||||
subw $move_self_here+0x200, %cx
|
||||
rep
|
||||
movsb
|
||||
ljmp $SETUPSEG, $move_self_here
|
||||
|
||||
move_self_here:
|
||||
movw $move_self_here+0x200, %cx
|
||||
rep
|
||||
movsb
|
||||
movw $SETUPSEG, %ax
|
||||
movw %ax, %ds
|
||||
movw %dx, %ss
|
||||
end_move_self: # now we are at the right place
|
||||
lidt idt_48 # load idt with 0,0
|
||||
xorl %eax, %eax # Compute gdt_base
|
||||
movw %ds, %ax # (Convert %ds:gdt to a linear ptr)
|
||||
shll $4, %eax
|
||||
addl $gdt, %eax
|
||||
movl %eax, (gdt_48+2)
|
||||
lgdt gdt_48 # load gdt with whatever is
|
||||
# appropriate
|
||||
|
||||
# that was painless, now we enable a20
|
||||
call empty_8042
|
||||
|
||||
movb $0xD1, %al # command write
|
||||
outb %al, $0x64
|
||||
call empty_8042
|
||||
|
||||
movb $0xDF, %al # A20 on
|
||||
outb %al, $0x60
|
||||
call empty_8042
|
||||
|
||||
#
|
||||
# You must preserve the other bits here. Otherwise embarrasing things
|
||||
# like laptops powering off on boot happen. Corrected version by Kira
|
||||
# Brown from Linux 2.2
|
||||
#
|
||||
inb $0x92, %al #
|
||||
orb $02, %al # "fast A20" version
|
||||
outb %al, $0x92 # some chips have only this
|
||||
|
||||
# wait until a20 really *is* enabled; it can take a fair amount of
|
||||
# time on certain systems; Toshiba Tecras are known to have this
|
||||
# problem. The memory location used here (0x200) is the int 0x80
|
||||
# vector, which should be safe to use.
|
||||
|
||||
xorw %ax, %ax # segment 0x0000
|
||||
movw %ax, %fs
|
||||
decw %ax # segment 0xffff (HMA)
|
||||
movw %ax, %gs
|
||||
a20_wait:
|
||||
incw %ax # unused memory location <0xfff0
|
||||
movw %ax, %fs:(0x200) # we use the "int 0x80" vector
|
||||
cmpw %gs:(0x210), %ax # and its corresponding HMA addr
|
||||
je a20_wait # loop until no longer aliased
|
||||
|
||||
# make sure any possible coprocessor is properly reset..
|
||||
xorw %ax, %ax
|
||||
outb %al, $0xf0
|
||||
call delay
|
||||
|
||||
outb %al, $0xf1
|
||||
call delay
|
||||
|
||||
# well, that went ok, I hope. Now we mask all interrupts - the rest
|
||||
# is done in init_IRQ().
|
||||
movb $0xFF, %al # mask all interrupts for now
|
||||
outb %al, $0xA1
|
||||
call delay
|
||||
|
||||
movb $0xFB, %al # mask all irq's but irq2 which
|
||||
outb %al, $0x21 # is cascaded
|
||||
|
||||
# Well, that certainly wasn't fun :-(. Hopefully it works, and we don't
|
||||
# need no steenking BIOS anyway (except for the initial loading :-).
|
||||
# The BIOS-routine wants lots of unnecessary data, and it's less
|
||||
# "interesting" anyway. This is how REAL programmers do it.
|
||||
#
|
||||
# Well, now's the time to actually move into protected mode. To make
|
||||
# things as simple as possible, we do no register set-up or anything,
|
||||
# we let the gnu-compiled 32-bit programs do that. We just jump to
|
||||
# absolute address 0x1000 (or the loader supplied one),
|
||||
# in 32-bit protected mode.
|
||||
#
|
||||
# Note that the short jump isn't strictly needed, although there are
|
||||
# reasons why it might be a good idea. It won't hurt in any case.
|
||||
movw $1, %ax # protected mode (PE) bit
|
||||
lmsw %ax # This is it!
|
||||
jmp flush_instr
|
||||
|
||||
flush_instr:
|
||||
xorw %bx, %bx # Flag to indicate a boot
|
||||
xorl %esi, %esi # Pointer to real-mode code
|
||||
movw %cs, %si
|
||||
subw $DELTA_INITSEG, %si
|
||||
shll $4, %esi # Convert to 32-bit pointer
|
||||
# NOTE: For high loaded big kernels we need a
|
||||
# jmpi 0x100000,__KERNEL_CS
|
||||
#
|
||||
# but we yet haven't reloaded the CS register, so the default size
|
||||
# of the target offset still is 16 bit.
|
||||
# However, using an operand prefix (0x66), the CPU will properly
|
||||
# take our 48 bit far pointer. (INTeL 80386 Programmer's Reference
|
||||
# Manual, Mixing 16-bit and 32-bit code, page 16-6)
|
||||
|
||||
.byte 0x66, 0xea # prefix + jmpi-opcode
|
||||
code32: .long 0x1000 # will be set to 0x100000
|
||||
# for big kernels
|
||||
.word __KERNEL_CS
|
||||
|
||||
# Here's a bunch of information about your current kernel..
|
||||
kernel_version: .ascii UTS_RELEASE
|
||||
.ascii " ("
|
||||
.ascii LINUX_COMPILE_BY
|
||||
.ascii "@"
|
||||
.ascii LINUX_COMPILE_HOST
|
||||
.ascii ") "
|
||||
.ascii UTS_VERSION
|
||||
.byte 0
|
||||
|
||||
# This is the default real mode switch routine.
|
||||
# to be called just before protected mode transition
|
||||
default_switch:
|
||||
cli # no interrupts allowed !
|
||||
movb $0x80, %al # disable NMI for bootup
|
||||
# sequence
|
||||
outb %al, $0x70
|
||||
lret
|
||||
|
||||
|
||||
# This routine checks that the keyboard command queue is empty
|
||||
# (after emptying the output buffers)
|
||||
#
|
||||
# Some machines have delusions that the keyboard buffer is always full
|
||||
# with no keyboard attached...
|
||||
#
|
||||
# If there is no keyboard controller, we will usually get 0xff
|
||||
# to all the reads. With each IO taking a microsecond and
|
||||
# a timeout of 100,000 iterations, this can take about half a
|
||||
# second ("delay" == outb to port 0x80). That should be ok,
|
||||
# and should also be plenty of time for a real keyboard controller
|
||||
# to empty.
|
||||
#
|
||||
|
||||
empty_8042:
|
||||
pushl %ecx
|
||||
movl $100000, %ecx
|
||||
|
||||
empty_8042_loop:
|
||||
decl %ecx
|
||||
jz empty_8042_end_loop
|
||||
|
||||
call delay
|
||||
|
||||
inb $0x64, %al # 8042 status port
|
||||
testb $1, %al # output buffer?
|
||||
jz no_output
|
||||
|
||||
call delay
|
||||
inb $0x60, %al # read it
|
||||
jmp empty_8042_loop
|
||||
|
||||
no_output:
|
||||
testb $2, %al # is input buffer full?
|
||||
jnz empty_8042_loop # yes - loop
|
||||
empty_8042_end_loop:
|
||||
popl %ecx
|
||||
ret
|
||||
|
||||
# Read the cmos clock. Return the seconds in al
|
||||
gettime:
|
||||
pushw %cx
|
||||
movb $0x02, %ah
|
||||
int $0x1a
|
||||
movb %dh, %al # %dh contains the seconds
|
||||
andb $0x0f, %al
|
||||
movb %dh, %ah
|
||||
movb $0x04, %cl
|
||||
shrb %cl, %ah
|
||||
aad
|
||||
popw %cx
|
||||
ret
|
||||
|
||||
# Delay is needed after doing I/O
|
||||
delay:
|
||||
outb %al,$0x80
|
||||
ret
|
||||
|
||||
# Descriptor tables
|
||||
gdt:
|
||||
.word 0, 0, 0, 0 # dummy
|
||||
|
||||
.word 0, 0, 0, 0 # unused
|
||||
|
||||
.word 0xFFFF # 4Gb - (0x100000*0x1000 = 4Gb)
|
||||
.word 0 # base address = 0
|
||||
.word 0x9A00 # code read/exec
|
||||
.word 0x00CF # granularity = 4096, 386
|
||||
# (+5th nibble of limit)
|
||||
|
||||
.word 0xFFFF # 4Gb - (0x100000*0x1000 = 4Gb)
|
||||
.word 0 # base address = 0
|
||||
.word 0x9200 # data read/write
|
||||
.word 0x00CF # granularity = 4096, 386
|
||||
# (+5th nibble of limit)
|
||||
gdt_end:
|
||||
idt_48:
|
||||
.word 0 # idt limit = 0
|
||||
.word 0, 0 # idt base = 0L
|
||||
gdt_48:
|
||||
.word gdt_end-gdt-1 # gdt limit
|
||||
.word 0, 0 # gdt base (filled in later)
|
||||
|
||||
# Include video setup & detection code
|
||||
|
||||
#include "../../i386/boot/video.S"
|
||||
|
||||
# Setup signature -- must be last
|
||||
setup_sig1: .word SIG1
|
||||
setup_sig2: .word SIG2
|
||||
|
||||
# After this point, there is some free space which is used by the video mode
|
||||
# handling code to store the temporary mode table (not used by the kernel).
|
||||
|
||||
modelist:
|
||||
|
||||
.text
|
||||
endtext:
|
||||
.data
|
||||
enddata:
|
||||
.bss
|
||||
endbss:
|
||||
|
|
@ -1,185 +0,0 @@
|
|||
/*
|
||||
* Copyright (C) 1991, 1992 Linus Torvalds
|
||||
* Copyright (C) 1997 Martin Mares
|
||||
*/
|
||||
|
||||
/*
|
||||
* This file builds a disk-image from three different files:
|
||||
*
|
||||
* - bootsect: compatibility mbr which prints an error message if
|
||||
* someone tries to boot the kernel directly.
|
||||
* - setup: 8086 machine code, sets up system parm
|
||||
* - system: 80386 code for actual system
|
||||
*
|
||||
* It does some checking that all files are of the correct type, and
|
||||
* just writes the result to stdout, removing headers and padding to
|
||||
* the right amount. It also writes some system data to stderr.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Changes by tytso to allow root device specification
|
||||
* High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
|
||||
* Cross compiling fixes by Gertjan van Wingerde, July 1996
|
||||
* Rewritten by Martin Mares, April 1997
|
||||
*/
|
||||
|
||||
#include <stdio.h>
|
||||
#include <string.h>
|
||||
#include <stdlib.h>
|
||||
#include <stdarg.h>
|
||||
#include <sys/types.h>
|
||||
#include <sys/stat.h>
|
||||
#include <sys/sysmacros.h>
|
||||
#include <unistd.h>
|
||||
#include <fcntl.h>
|
||||
#include <asm/boot.h>
|
||||
|
||||
typedef unsigned char byte;
|
||||
typedef unsigned short word;
|
||||
typedef unsigned long u32;
|
||||
|
||||
#define DEFAULT_MAJOR_ROOT 0
|
||||
#define DEFAULT_MINOR_ROOT 0
|
||||
|
||||
/* Minimal number of setup sectors (see also bootsect.S) */
|
||||
#define SETUP_SECTS 4
|
||||
|
||||
byte buf[1024];
|
||||
int fd;
|
||||
int is_big_kernel;
|
||||
|
||||
void die(const char * str, ...)
|
||||
{
|
||||
va_list args;
|
||||
va_start(args, str);
|
||||
vfprintf(stderr, str, args);
|
||||
fputc('\n', stderr);
|
||||
exit(1);
|
||||
}
|
||||
|
||||
void file_open(const char *name)
|
||||
{
|
||||
if ((fd = open(name, O_RDONLY, 0)) < 0)
|
||||
die("Unable to open `%s': %m", name);
|
||||
}
|
||||
|
||||
void usage(void)
|
||||
{
|
||||
die("Usage: build [-b] bootsect setup system [rootdev] [> image]");
|
||||
}
|
||||
|
||||
int main(int argc, char ** argv)
|
||||
{
|
||||
unsigned int i, c, sz, setup_sectors;
|
||||
u32 sys_size;
|
||||
byte major_root, minor_root;
|
||||
struct stat sb;
|
||||
|
||||
if (argc > 2 && !strcmp(argv[1], "-b"))
|
||||
{
|
||||
is_big_kernel = 1;
|
||||
argc--, argv++;
|
||||
}
|
||||
if ((argc < 4) || (argc > 5))
|
||||
usage();
|
||||
if (argc > 4) {
|
||||
if (!strcmp(argv[4], "CURRENT")) {
|
||||
if (stat("/", &sb)) {
|
||||
perror("/");
|
||||
die("Couldn't stat /");
|
||||
}
|
||||
major_root = major(sb.st_dev);
|
||||
minor_root = minor(sb.st_dev);
|
||||
} else if (strcmp(argv[4], "FLOPPY")) {
|
||||
if (stat(argv[4], &sb)) {
|
||||
perror(argv[4]);
|
||||
die("Couldn't stat root device.");
|
||||
}
|
||||
major_root = major(sb.st_rdev);
|
||||
minor_root = minor(sb.st_rdev);
|
||||
} else {
|
||||
major_root = 0;
|
||||
minor_root = 0;
|
||||
}
|
||||
} else {
|
||||
major_root = DEFAULT_MAJOR_ROOT;
|
||||
minor_root = DEFAULT_MINOR_ROOT;
|
||||
}
|
||||
fprintf(stderr, "Root device is (%d, %d)\n", major_root, minor_root);
|
||||
|
||||
file_open(argv[1]);
|
||||
i = read(fd, buf, sizeof(buf));
|
||||
fprintf(stderr,"Boot sector %d bytes.\n",i);
|
||||
if (i != 512)
|
||||
die("Boot block must be exactly 512 bytes");
|
||||
if (buf[510] != 0x55 || buf[511] != 0xaa)
|
||||
die("Boot block hasn't got boot flag (0xAA55)");
|
||||
buf[508] = minor_root;
|
||||
buf[509] = major_root;
|
||||
if (write(1, buf, 512) != 512)
|
||||
die("Write call failed");
|
||||
close (fd);
|
||||
|
||||
file_open(argv[2]); /* Copy the setup code */
|
||||
for (i=0 ; (c=read(fd, buf, sizeof(buf)))>0 ; i+=c )
|
||||
if (write(1, buf, c) != c)
|
||||
die("Write call failed");
|
||||
if (c != 0)
|
||||
die("read-error on `setup'");
|
||||
close (fd);
|
||||
|
||||
setup_sectors = (i + 511) / 512; /* Pad unused space with zeros */
|
||||
/* for compatibility with ancient versions of LILO. */
|
||||
if (setup_sectors < SETUP_SECTS)
|
||||
setup_sectors = SETUP_SECTS;
|
||||
fprintf(stderr, "Setup is %d bytes.\n", i);
|
||||
memset(buf, 0, sizeof(buf));
|
||||
while (i < setup_sectors * 512) {
|
||||
c = setup_sectors * 512 - i;
|
||||
if (c > sizeof(buf))
|
||||
c = sizeof(buf);
|
||||
if (write(1, buf, c) != c)
|
||||
die("Write call failed");
|
||||
i += c;
|
||||
}
|
||||
|
||||
file_open(argv[3]);
|
||||
if (fstat (fd, &sb))
|
||||
die("Unable to stat `%s': %m", argv[3]);
|
||||
sz = sb.st_size;
|
||||
fprintf (stderr, "System is %d kB\n", sz/1024);
|
||||
sys_size = (sz + 15) / 16;
|
||||
if (!is_big_kernel && sys_size > DEF_SYSSIZE)
|
||||
die("System is too big. Try using bzImage or modules.");
|
||||
while (sz > 0) {
|
||||
int l, n;
|
||||
|
||||
l = (sz > sizeof(buf)) ? sizeof(buf) : sz;
|
||||
if ((n=read(fd, buf, l)) != l) {
|
||||
if (n < 0)
|
||||
die("Error reading %s: %m", argv[3]);
|
||||
else
|
||||
die("%s: Unexpected EOF", argv[3]);
|
||||
}
|
||||
if (write(1, buf, l) != l)
|
||||
die("Write failed");
|
||||
sz -= l;
|
||||
}
|
||||
close(fd);
|
||||
|
||||
if (lseek(1, 497, SEEK_SET) != 497) /* Write sizes to the bootsector */
|
||||
die("Output: seek failed");
|
||||
buf[0] = setup_sectors;
|
||||
if (write(1, buf, 1) != 1)
|
||||
die("Write of setup sector count failed");
|
||||
if (lseek(1, 500, SEEK_SET) != 500)
|
||||
die("Output: seek failed");
|
||||
buf[0] = (sys_size & 0xff);
|
||||
buf[1] = ((sys_size >> 8) & 0xff);
|
||||
buf[2] = ((sys_size >> 16) & 0xff);
|
||||
buf[3] = ((sys_size >> 24) & 0xff);
|
||||
if (write(1, buf, 4) != 4)
|
||||
die("Write of image length failed");
|
||||
|
||||
return 0; /* Everything is OK */
|
||||
}
|
||||
Loading…
Reference in New Issue