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Commit b3266bd6 authored by Jarkko Sakkinen's avatar Jarkko Sakkinen Committed by H. Peter Anvin
Browse files

x86, realmode: realmode.bin infrastructure 



Create realmode.bin and realmode.relocs files. Piggy
pack them into relocatable object that will be included
into .init.data section of the main kernel image.

The first file includes binary image of the real-mode code.
The latter file includes all relocations. The layout of the
binary image is specified in realmode.lds.S. The makefile
generates pa_ prefixed symbols for each exported global.
These are used in 32-bit code and in realmode header to
define symbols that need to be relocated.

Signed-off-by: default avatarJarkko Sakkinen <jarkko.sakkinen@intel.com>
Link: http://lkml.kernel.org/r/1336501366-28617-3-git-send-email-jarkko.sakkinen@intel.com


Originally-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
Signed-off-by: default avatarH. Peter Anvin <hpa@linux.intel.com>
parent 433de739

arch/x86/Kbuild

+1 −1
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obj-$(CONFIG_KVM) += kvm/



# Xen paravirtualization support
@@ -7,6 +6,7 @@ obj-$(CONFIG_XEN) += xen/ 
# lguest paravirtualization support

obj-$(CONFIG_LGUEST_GUEST) += lguest/



obj-y += realmode/

obj-y += kernel/

obj-y += mm/

arch/x86/realmode/Makefile

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#

# arch/x86/realmode/Makefile

#

# This file is subject to the terms and conditions of the GNU General Public

# License.  See the file "COPYING" in the main directory of this archive

# for more details.

#

#



subdir- := rm



obj-y += rmpiggy.o



$(obj)/rmpiggy.o: $(obj)/rm/realmode.relocs $(obj)/rm/realmode.bin



$(obj)/rm/realmode.bin: FORCE

	$(Q)$(MAKE) $(build)=$(obj)/rm $@



$(obj)/rm/realmode.relocs: FORCE

	$(Q)$(MAKE) $(build)=$(obj)/rm $@

arch/x86/realmode/rm/.gitignore

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pasyms.h

realmode.lds

realmode.relocs

arch/x86/realmode/rm/Makefile

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#

# arch/x86/realmode/Makefile

#

# This file is subject to the terms and conditions of the GNU General Public

# License.  See the file "COPYING" in the main directory of this archive

# for more details.

#

#



subdir- := wakeup



always := realmode.bin



realmode-y			+= header.o



targets	+= $(realmode-y)



REALMODE_OBJS = $(addprefix $(obj)/,$(realmode-y))



sed-pasyms := -n -r -e 's/^([0-9a-fA-F]+) [ABCDGRSTVW] (.+)$$/pa_\2 = \2;/p'



quiet_cmd_pasyms = PASYMS  $@

      cmd_pasyms = $(NM) $(filter-out FORCE,$^) | \

		   sed $(sed-pasyms) | sort | uniq > $@



$(obj)/pasyms.h: $(REALMODE_OBJS) FORCE

	$(call if_changed,pasyms)



$(obj)/realmode.lds: $(obj)/pasyms.h



LDFLAGS_realmode.elf := --emit-relocs -T

CPPFLAGS_realmode.lds += -P -C -I$(obj)



$(obj)/realmode.elf: $(obj)/realmode.lds $(REALMODE_OBJS) FORCE

	$(call if_changed,ld)



OBJCOPYFLAGS_realmode.bin := -O binary



$(obj)/realmode.bin: $(obj)/realmode.elf

	$(call if_changed,objcopy)



quiet_cmd_relocs = RELOCS  $@

      cmd_relocs = scripts/x86-relocs --realmode $< > $@

$(obj)/realmode.relocs: $(obj)/realmode.elf FORCE

	$(call if_changed,relocs)



# ---------------------------------------------------------------------------



# How to compile the 16-bit code.  Note we always compile for -march=i386,

# that way we can complain to the user if the CPU is insufficient.

KBUILD_CFLAGS	:= $(LINUXINCLUDE) -m32 -g -Os -D_SETUP -D__KERNEL__ \

		   -DDISABLE_BRANCH_PROFILING \

		   -Wall -Wstrict-prototypes \

		   -march=i386 -mregparm=3 \

		   -include $(srctree)/$(src)/../../boot/code16gcc.h \

		   -fno-strict-aliasing -fomit-frame-pointer \

		   $(call cc-option, -ffreestanding) \

		   $(call cc-option, -fno-toplevel-reorder,\

			$(call cc-option, -fno-unit-at-a-time)) \

		   $(call cc-option, -fno-stack-protector) \

		   $(call cc-option, -mpreferred-stack-boundary=2)

KBUILD_AFLAGS	:= $(KBUILD_CFLAGS) -D__ASSEMBLY__

GCOV_PROFILE := n

arch/x86/realmode/rm/header.S

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/*

 * Real-mode blob header; this should match realmode.h and be

 * readonly; for mutable data instead add pointers into the .data

 * or .bss sections as appropriate.

 */



#include <linux/linkage.h>

#include <asm/page_types.h>



		.section ".header", "a"



ENTRY(real_mode_header)

		.long	pa_text_start

		.long	pa_ro_end

		.long	pa_end

END(real_mode_header)