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Commit 019abbc8 authored by Linus Torvalds's avatar Linus Torvalds
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Merge branch 'x86-stage-3-for-linus' of... 

Merge branch 'x86-stage-3-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'x86-stage-3-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (190 commits)
  Revert "cpuacct: reduce one NULL check in fast-path"
  Revert "x86: don't compile vsmp_64 for 32bit"
  x86: Correct behaviour of irq affinity
  x86: early_ioremap_init(), use __fix_to_virt(), because we are sure it's safe
  x86: use default_cpu_mask_to_apicid for 64bit
  x86: fix set_extra_move_desc calling
  x86, PAT, PCI: Change vma prot in pci_mmap to reflect inherited prot
  x86/dmi: fix dmi_alloc() section mismatches
  x86: e820 fix various signedness issues in setup.c and e820.c
  x86: apic/io_apic.c define msi_ir_chip and ir_ioapic_chip all the time
  x86: irq.c keep CONFIG_X86_LOCAL_APIC interrupts together
  x86: irq.c use same path for show_interrupts
  x86: cpu/cpu.h cleanup
  x86: Fix a couple of sparse warnings in arch/x86/kernel/apic/io_apic.c
  Revert "x86: create a non-zero sized bm_pte only when needed"
  x86: pci-nommu.c cleanup
  x86: io_delay.c cleanup
  x86: rtc.c cleanup
  x86: i8253 cleanup
  x86: kdebugfs.c cleanup
  ...
parents 2d25ee36 5a3c8fe7

Documentation/x86/earlyprintk.txt

0 → 100644
+101 −0
Original line number Diff line number Diff line 


Mini-HOWTO for using the earlyprintk=dbgp boot option with a

USB2 Debug port key and a debug cable, on x86 systems.



You need two computers, the 'USB debug key' special gadget and

and two USB cables, connected like this:



  [host/target] <-------> [USB debug key] <-------> [client/console]



1. There are three specific hardware requirements:



 a.) Host/target system needs to have USB debug port capability.



 You can check this capability by looking at a 'Debug port' bit in

 the lspci -vvv output:



 # lspci -vvv

 ...

 00:1d.7 USB Controller: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 (rev 03) (prog-if 20 [EHCI])

         Subsystem: Lenovo ThinkPad T61

         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-

         Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-

         Latency: 0

         Interrupt: pin D routed to IRQ 19

         Region 0: Memory at fe227000 (32-bit, non-prefetchable) [size=1K]

         Capabilities: [50] Power Management version 2

                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0+,D1-,D2-,D3hot+,D3cold+)

                 Status: D0 PME-Enable- DSel=0 DScale=0 PME+

         Capabilities: [58] Debug port: BAR=1 offset=00a0

                            ^^^^^^^^^^^ <==================== [ HERE ]

	 Kernel driver in use: ehci_hcd

         Kernel modules: ehci-hcd

 ...



( If your system does not list a debug port capability then you probably

  wont be able to use the USB debug key. )



 b.) You also need a Netchip USB debug cable/key:



        http://www.plxtech.com/products/NET2000/NET20DC/default.asp



     This is a small blue plastic connector with two USB connections,

     it draws power from its USB connections.



 c.) Thirdly, you need a second client/console system with a regular USB port.



2. Software requirements:



 a.) On the host/target system:



    You need to enable the following kernel config option:



      CONFIG_EARLY_PRINTK_DBGP=y



    And you need to add the boot command line: "earlyprintk=dbgp".

    (If you are using Grub, append it to the 'kernel' line in

     /etc/grub.conf)



    NOTE: normally earlyprintk console gets turned off once the

    regular console is alive - use "earlyprintk=dbgp,keep" to keep

    this channel open beyond early bootup. This can be useful for

    debugging crashes under Xorg, etc.



 b.) On the client/console system:



    You should enable the following kernel config option:



      CONFIG_USB_SERIAL_DEBUG=y



    On the next bootup with the modified kernel you should

    get a /dev/ttyUSBx device(s).



    Now this channel of kernel messages is ready to be used: start

    your favorite terminal emulator (minicom, etc.) and set

    it up to use /dev/ttyUSB0 - or use a raw 'cat /dev/ttyUSBx' to

    see the raw output.



 c.) On Nvidia Southbridge based systems: the kernel will try to probe

     and find out which port has debug device connected.



3. Testing that it works fine:



   You can test the output by using earlyprintk=dbgp,keep and provoking

   kernel messages on the host/target system. You can provoke a harmless

   kernel message by for example doing:



     echo h > /proc/sysrq-trigger



   On the host/target system you should see this help line in "dmesg" output:



     SysRq : HELP : loglevel(0-9) reBoot Crashdump terminate-all-tasks(E) memory-full-oom-kill(F) kill-all-tasks(I) saK show-backtrace-all-active-cpus(L) show-memory-usage(M) nice-all-RT-tasks(N) powerOff show-registers(P) show-all-timers(Q) unRaw Sync show-task-states(T) Unmount show-blocked-tasks(W) dump-ftrace-buffer(Z)



   On the client/console system do:



       cat /dev/ttyUSB0



   And you should see the help line above displayed shortly after you've

   provoked it on the host system.



If it does not work then please ask about it on the linux-kernel@vger.kernel.org

mailing list or contact the x86 maintainers.

arch/x86/Kconfig

+13 −2
Original line number Diff line number Diff line
@@ -786,6 +786,11 @@ config X86_MCE_AMD 
	   Additional support for AMD specific MCE features such as

	   the DRAM Error Threshold.



config X86_MCE_THRESHOLD

	depends on X86_MCE_AMD || X86_MCE_INTEL

	bool

	default y



config X86_MCE_NONFATAL

	tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"

	depends on X86_32 && X86_MCE
@@ -929,6 +934,12 @@ config X86_CPUID 
	  with major 203 and minors 0 to 31 for /dev/cpu/0/cpuid to

	  /dev/cpu/31/cpuid.



config X86_CPU_DEBUG

	tristate "/sys/kernel/debug/x86/cpu/* - CPU Debug support"

	---help---

	  If you select this option, this will provide various x86 CPUs

	  information through debugfs.



choice

	prompt "High Memory Support"

	default HIGHMEM4G if !X86_NUMAQ
@@ -1121,7 +1132,7 @@ config NUMA_EMU 


config NODES_SHIFT

	int "Maximum NUMA Nodes (as a power of 2)" if !MAXSMP

	range 1 9   if X86_64

	range 1 9

	default "9" if MAXSMP

	default "6" if X86_64

	default "4" if X86_NUMAQ
@@ -1429,7 +1440,7 @@ config CRASH_DUMP 
config KEXEC_JUMP

	bool "kexec jump (EXPERIMENTAL)"

	depends on EXPERIMENTAL

	depends on KEXEC && HIBERNATION && X86_32

	depends on KEXEC && HIBERNATION

	---help---

	  Jump between original kernel and kexeced kernel and invoke

	  code in physical address mode via KEXEC

arch/x86/Kconfig.cpu

+1 −16
Original line number Diff line number Diff line
@@ -456,24 +456,9 @@ config CPU_SUP_AMD 


	  If unsure, say N.



config CPU_SUP_CENTAUR_32

config CPU_SUP_CENTAUR

	default y

	bool "Support Centaur processors" if PROCESSOR_SELECT

	depends on !64BIT

	---help---

	  This enables detection, tunings and quirks for Centaur processors



	  You need this enabled if you want your kernel to run on a

	  Centaur CPU. Disabling this option on other types of CPUs

	  makes the kernel a tiny bit smaller. Disabling it on a Centaur

	  CPU might render the kernel unbootable.



	  If unsure, say N.



config CPU_SUP_CENTAUR_64

	default y

	bool "Support Centaur processors" if PROCESSOR_SELECT

	depends on 64BIT

	---help---

	  This enables detection, tunings and quirks for Centaur processors

arch/x86/Makefile

+7 −22
Original line number Diff line number Diff line
@@ -153,34 +153,23 @@ endif 


boot := arch/x86/boot



PHONY += zImage bzImage compressed zlilo bzlilo \

         zdisk bzdisk fdimage fdimage144 fdimage288 isoimage install

BOOT_TARGETS = bzlilo bzdisk fdimage fdimage144 fdimage288 isoimage install



PHONY += bzImage $(BOOT_TARGETS)



# Default kernel to build

all: bzImage



# KBUILD_IMAGE specify target image being built

KBUILD_IMAGE := $(boot)/bzImage

zImage zlilo zdisk: KBUILD_IMAGE := $(boot)/zImage



zImage bzImage: vmlinux

bzImage: vmlinux

	$(Q)$(MAKE) $(build)=$(boot) $(KBUILD_IMAGE)

	$(Q)mkdir -p $(objtree)/arch/$(UTS_MACHINE)/boot

	$(Q)ln -fsn ../../x86/boot/bzImage $(objtree)/arch/$(UTS_MACHINE)/boot/$@



compressed: zImage



zlilo bzlilo: vmlinux

	$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) zlilo



zdisk bzdisk: vmlinux

	$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) zdisk



fdimage fdimage144 fdimage288 isoimage: vmlinux

	$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) $@



install:

	$(Q)$(MAKE) $(build)=$(boot) BOOTIMAGE=$(KBUILD_IMAGE) install

$(BOOT_TARGETS): vmlinux

	$(Q)$(MAKE) $(build)=$(boot) $@



PHONY += vdso_install

vdso_install:
@@ -205,7 +194,3 @@ define archhelp 
  echo  '                  FDARGS="..."  arguments for the booted kernel'

  echo  '                  FDINITRD=file initrd for the booted kernel'

endef
 


CLEAN_FILES += arch/x86/boot/fdimage \

	       arch/x86/boot/image.iso \

	       arch/x86/boot/mtools.conf

arch/x86/boot/Makefile

+25 −28
Original line number Diff line number Diff line
@@ -6,6 +6,7 @@ 
# for more details.

#

# Copyright (C) 1994 by Linus Torvalds

# Changed by many, many contributors over the years.

#



# ROOT_DEV specifies the default root-device when making the image.
@@ -21,11 +22,8 @@ ROOT_DEV := CURRENT 


SVGA_MODE	:= -DSVGA_MODE=NORMAL_VGA



# If you want the RAM disk device, define this to be the size in blocks.



#RAMDISK := -DRAMDISK=512



targets		:= vmlinux.bin setup.bin setup.elf zImage bzImage

targets		:= vmlinux.bin setup.bin setup.elf bzImage

targets		+= fdimage fdimage144 fdimage288 image.iso mtools.conf

subdir-		:= compressed



setup-y		+= a20.o cmdline.o copy.o cpu.o cpucheck.o edd.o
@@ -71,17 +69,13 @@ KBUILD_CFLAGS := $(LINUXINCLUDE) -g -Os -D_SETUP -D__KERNEL__ \ 
KBUILD_CFLAGS +=   $(call cc-option,-m32)

KBUILD_AFLAGS	:= $(KBUILD_CFLAGS) -D__ASSEMBLY__



$(obj)/zImage:  asflags-y := $(SVGA_MODE) $(RAMDISK)

$(obj)/bzImage: ccflags-y := -D__BIG_KERNEL__

$(obj)/bzImage: asflags-y := $(SVGA_MODE) $(RAMDISK) -D__BIG_KERNEL__

$(obj)/bzImage: BUILDFLAGS   := -b

$(obj)/bzImage: asflags-y  := $(SVGA_MODE)



quiet_cmd_image = BUILD   $@

cmd_image = $(obj)/tools/build $(BUILDFLAGS) $(obj)/setup.bin \

	    $(obj)/vmlinux.bin $(ROOT_DEV) > $@

cmd_image = $(obj)/tools/build $(obj)/setup.bin $(obj)/vmlinux.bin \

	$(ROOT_DEV) > $@



$(obj)/zImage $(obj)/bzImage: $(obj)/setup.bin \

			      $(obj)/vmlinux.bin $(obj)/tools/build FORCE

$(obj)/bzImage: $(obj)/setup.bin $(obj)/vmlinux.bin $(obj)/tools/build FORCE

	$(call if_changed,image)

	@echo 'Kernel: $@ is ready' ' (#'`cat .version`')'
@@ -116,9 +110,11 @@ $(obj)/setup.bin: $(obj)/setup.elf FORCE 
$(obj)/compressed/vmlinux: FORCE

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



# Set this if you want to pass append arguments to the zdisk/fdimage/isoimage kernel

# Set this if you want to pass append arguments to the

# bzdisk/fdimage/isoimage kernel

FDARGS =

# Set this if you want an initrd included with the zdisk/fdimage/isoimage kernel

# Set this if you want an initrd included with the

# bzdisk/fdimage/isoimage kernel

FDINITRD =



image_cmdline = default linux $(FDARGS) $(if $(FDINITRD),initrd=initrd.img,)
@@ -127,7 +123,7 @@ $(obj)/mtools.conf: $(src)/mtools.conf.in 
	sed -e 's|@OBJ@|$(obj)|g' < $< > $@



# This requires write access to /dev/fd0

zdisk: $(BOOTIMAGE) $(obj)/mtools.conf

bzdisk: $(obj)/bzImage $(obj)/mtools.conf

	MTOOLSRC=$(obj)/mtools.conf mformat a:			; sync

	syslinux /dev/fd0					; sync

	echo '$(image_cmdline)' | \
@@ -135,10 +131,10 @@ zdisk: $(BOOTIMAGE) $(obj)/mtools.conf 
	if [ -f '$(FDINITRD)' ] ; then \

		MTOOLSRC=$(obj)/mtools.conf mcopy '$(FDINITRD)' a:initrd.img ; \

	fi

	MTOOLSRC=$(obj)/mtools.conf mcopy $(BOOTIMAGE) a:linux	; sync

	MTOOLSRC=$(obj)/mtools.conf mcopy $(obj)/bzImage a:linux	; sync



# These require being root or having syslinux 2.02 or higher installed

fdimage fdimage144: $(BOOTIMAGE) $(obj)/mtools.conf

fdimage fdimage144: $(obj)/bzImage $(obj)/mtools.conf

	dd if=/dev/zero of=$(obj)/fdimage bs=1024 count=1440

	MTOOLSRC=$(obj)/mtools.conf mformat v:			; sync

	syslinux $(obj)/fdimage					; sync
@@ -147,9 +143,9 @@ fdimage fdimage144: $(BOOTIMAGE) $(obj)/mtools.conf 
	if [ -f '$(FDINITRD)' ] ; then \

		MTOOLSRC=$(obj)/mtools.conf mcopy '$(FDINITRD)' v:initrd.img ; \

	fi

	MTOOLSRC=$(obj)/mtools.conf mcopy $(BOOTIMAGE) v:linux	; sync

	MTOOLSRC=$(obj)/mtools.conf mcopy $(obj)/bzImage v:linux	; sync



fdimage288: $(BOOTIMAGE) $(obj)/mtools.conf

fdimage288: $(obj)/bzImage $(obj)/mtools.conf

	dd if=/dev/zero of=$(obj)/fdimage bs=1024 count=2880

	MTOOLSRC=$(obj)/mtools.conf mformat w:			; sync

	syslinux $(obj)/fdimage					; sync
@@ -158,9 +154,9 @@ fdimage288: $(BOOTIMAGE) $(obj)/mtools.conf 
	if [ -f '$(FDINITRD)' ] ; then \

		MTOOLSRC=$(obj)/mtools.conf mcopy '$(FDINITRD)' w:initrd.img ; \

	fi

	MTOOLSRC=$(obj)/mtools.conf mcopy $(BOOTIMAGE) w:linux	; sync

	MTOOLSRC=$(obj)/mtools.conf mcopy $(obj)/bzImage w:linux	; sync



isoimage: $(BOOTIMAGE)

isoimage: $(obj)/bzImage

	-rm -rf $(obj)/isoimage

	mkdir $(obj)/isoimage

	for i in lib lib64 share end ; do \
@@ -170,7 +166,7 @@ isoimage: $(BOOTIMAGE) 
		fi ; \

		if [ $$i = end ] ; then exit 1 ; fi ; \

	done

	cp $(BOOTIMAGE) $(obj)/isoimage/linux

	cp $(obj)/bzImage $(obj)/isoimage/linux

	echo '$(image_cmdline)' > $(obj)/isoimage/isolinux.cfg

	if [ -f '$(FDINITRD)' ] ; then \

		cp '$(FDINITRD)' $(obj)/isoimage/initrd.img ; \
@@ -181,12 +177,13 @@ isoimage: $(BOOTIMAGE) 
	isohybrid $(obj)/image.iso 2>/dev/null || true

	rm -rf $(obj)/isoimage



zlilo: $(BOOTIMAGE)

bzlilo: $(obj)/bzImage

	if [ -f $(INSTALL_PATH)/vmlinuz ]; then mv $(INSTALL_PATH)/vmlinuz $(INSTALL_PATH)/vmlinuz.old; fi

	if [ -f $(INSTALL_PATH)/System.map ]; then mv $(INSTALL_PATH)/System.map $(INSTALL_PATH)/System.old; fi

	cat $(BOOTIMAGE) > $(INSTALL_PATH)/vmlinuz

	cat $(obj)/bzImage > $(INSTALL_PATH)/vmlinuz

	cp System.map $(INSTALL_PATH)/

	if [ -x /sbin/lilo ]; then /sbin/lilo; else /etc/lilo/install; fi



install:

	sh $(srctree)/$(src)/install.sh $(KERNELRELEASE) $(BOOTIMAGE) System.map "$(INSTALL_PATH)"
 
	sh $(srctree)/$(src)/install.sh $(KERNELRELEASE) $(obj)/bzImage \

		System.map "$(INSTALL_PATH)"