powerpc: Merge enough to start building in arch/powerpc.

This creates the directory structure under arch/powerpc and a bunch
of Kconfig files.  It does a first-cut merge of arch/powerpc/mm,
arch/powerpc/lib and arch/powerpc/platforms/powermac.  This is enough
to build a 32-bit powermac kernel with ARCH=powerpc.

For now we are getting some unmerged files from arch/ppc/kernel and
arch/ppc/syslib, or arch/ppc64/kernel.  This makes some minor changes
to files in those directories and files outside arch/powerpc.

The boot directory is still not merged.  That's going to be interesting.

Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/Kconfig.debug

@@ -0,0 +1,73 @@
+menu "Kernel hacking"
+
+source "lib/Kconfig.debug"
+
+config KGDB
+	bool "Include kgdb kernel debugger"
+	depends on DEBUG_KERNEL && (BROKEN || PPC_GEN550 || 4xx)
+	select DEBUG_INFO
+	help
+	  Include in-kernel hooks for kgdb, the Linux kernel source level
+	  debugger.  See <http://kgdb.sourceforge.net/> for more information.
+	  Unless you are intending to debug the kernel, say N here.
+
+choice
+	prompt "Serial Port"
+	depends on KGDB
+	default KGDB_TTYS1
+
+config KGDB_TTYS0
+	bool "ttyS0"
+
+config KGDB_TTYS1
+	bool "ttyS1"
+
+config KGDB_TTYS2
+	bool "ttyS2"
+
+config KGDB_TTYS3
+	bool "ttyS3"
+
+endchoice
+
+config KGDB_CONSOLE
+	bool "Enable serial console thru kgdb port"
+	depends on KGDB && 8xx || CPM2
+	help
+	  If you enable this, all serial console messages will be sent
+	  over the gdb stub.
+	  If unsure, say N.
+
+config XMON
+	bool "Include xmon kernel debugger"
+	depends on DEBUG_KERNEL
+	help
+	  Include in-kernel hooks for the xmon kernel monitor/debugger.
+	  Unless you are intending to debug the kernel, say N here.
+
+config BDI_SWITCH
+	bool "Include BDI-2000 user context switcher"
+	depends on DEBUG_KERNEL
+	help
+	  Include in-kernel support for the Abatron BDI2000 debugger.
+	  Unless you are intending to debug the kernel with one of these
+	  machines, say N here.
+
+config BOOTX_TEXT
+	bool "Support for early boot text console (BootX or OpenFirmware only)"
+	depends PPC_OF
+	help
+	  Say Y here to see progress messages from the boot firmware in text
+	  mode. Requires either BootX or Open Firmware.
+
+config SERIAL_TEXT_DEBUG
+	bool "Support for early boot texts over serial port"
+	depends on 4xx || LOPEC || MV64X60 || PPLUS || PRPMC800 || \
+		PPC_GEN550 || PPC_MPC52xx
+
+config PPC_OCP
+	bool
+	depends on IBM_OCP || XILINX_OCP
+	default y
+
+endmenu

arch/powerpc/Makefile

@@ -0,0 +1,222 @@
+# This file is included by the global makefile so that you can add your own
+# architecture-specific flags and dependencies. Remember to do have actions
+# for "archclean" and "archdep" for cleaning up and making dependencies for
+# this architecture.
+#
+# 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.
+#
+# Copyright (C) 1994 by Linus Torvalds
+# Changes for PPC by Gary Thomas
+# Rewritten by Cort Dougan and Paul Mackerras
+#
+
+# This must match PAGE_OFFSET in include/asm-powerpc/page.h.
+KERNELLOAD	:= $(CONFIG_KERNEL_START)
+
+HAS_BIARCH	:= $(call cc-option-yn, -m32)
+
+ifeq ($(CONFIG_PPC64),y)
+SZ	:= 64
+
+# Set default 32 bits cross compilers for vdso and boot wrapper
+CROSS32_COMPILE ?=
+
+CROSS32CC		:= $(CROSS32_COMPILE)gcc
+CROSS32AS		:= $(CROSS32_COMPILE)as
+CROSS32LD		:= $(CROSS32_COMPILE)ld
+CROSS32OBJCOPY		:= $(CROSS32_COMPILE)objcopy
+
+ifeq ($(HAS_BIARCH),y)
+ifeq ($(CROSS32_COMPILE),)
+CROSS32CC	:= $(CC) -m32
+CROSS32AS	:= $(AS) -a32
+CROSS32LD	:= $(LD) -m elf32ppc
+CROSS32OBJCOPY	:= $(OBJCOPY)
+endif
+endif
+
+export CROSS32CC CROSS32AS CROSS32LD CROSS32OBJCOPY
+
+new_nm := $(shell if $(NM) --help 2>&1 | grep -- '--synthetic' > /dev/null; then echo y; else echo n; fi)
+
+ifeq ($(new_nm),y)
+NM		:= $(NM) --synthetic
+endif
+
+else
+SZ	:= 32
+endif
+
+ifeq ($(HAS_BIARCH),y)
+override AS	+= -a$(SZ)
+override LD	+= -m elf$(SZ)ppc
+override CC	+= -m$(SZ)
+endif
+
+LDFLAGS_vmlinux	:= -Ttext $(KERNELLOAD) -Bstatic -e $(KERNELLOAD)
+
+# The -Iarch/$(ARCH)/include is temporary while we are merging
+CPPFLAGS	+= -Iarch/$(ARCH) -Iarch/$(ARCH)/include
+AFLAGS		+= -Iarch/$(ARCH)
+CFLAGS		+= -Iarch/$(ARCH) -msoft-float -pipe
+ifeq ($(CONFIG_PPC64),y)
+CFLAGS		+= -mminimal-toc -mtraceback=none  -mcall-aixdesc
+else
+CFLAGS		+= -ffixed-r2 -mmultiple
+endif
+CPP		= $(CC) -E $(CFLAGS)
+# Temporary hack until we have migrated to asm-powerpc
+LINUXINCLUDE    += -Iarch/$(ARCH)/include
+
+CHECKFLAGS	+= -m$(SZ) -D__powerpc__ -D__powerpc$(SZ)__
+
+ifeq ($(CONFIG_PPC64),y)
+GCC_VERSION     := $(call cc-version)
+GCC_BROKEN_VEC	:= $(shell if [ $(GCC_VERSION) -lt 0400 ] ; then echo "y"; fi)
+
+ifeq ($(CONFIG_POWER4_ONLY),y)
+ifeq ($(CONFIG_ALTIVEC),y)
+ifeq ($(GCC_BROKEN_VEC),y)
+	CFLAGS += $(call cc-option,-mcpu=970)
+else
+	CFLAGS += $(call cc-option,-mcpu=power4)
+endif
+else
+	CFLAGS += $(call cc-option,-mcpu=power4)
+endif
+else
+	CFLAGS += $(call cc-option,-mtune=power4)
+endif
+endif
+
+# Enable unit-at-a-time mode when possible. It shrinks the
+# kernel considerably.
+CFLAGS += $(call cc-option,-funit-at-a-time)
+
+ifndef CONFIG_FSL_BOOKE
+CFLAGS		+= -mstring
+endif
+
+cpu-as-$(CONFIG_PPC64BRIDGE)	+= -Wa,-mppc64bridge
+cpu-as-$(CONFIG_4xx)		+= -Wa,-m405
+cpu-as-$(CONFIG_6xx)		+= -Wa,-maltivec
+cpu-as-$(CONFIG_POWER4)		+= -Wa,-maltivec
+cpu-as-$(CONFIG_E500)		+= -Wa,-me500
+cpu-as-$(CONFIG_E200)		+= -Wa,-me200
+
+AFLAGS += $(cpu-as-y)
+CFLAGS += $(cpu-as-y)
+
+# Default to the common case.
+KBUILD_DEFCONFIG := common_defconfig
+
+head-y				:= arch/powerpc/kernel/head.o
+head-$(CONFIG_PPC64)		:= arch/powerpc/kernel/head_64.o
+head-$(CONFIG_8xx)		:= arch/powerpc/kernel/head_8xx.o
+head-$(CONFIG_4xx)		:= arch/powerpc/kernel/head_4xx.o
+head-$(CONFIG_44x)		:= arch/powerpc/kernel/head_44x.o
+head-$(CONFIG_FSL_BOOKE)	:= arch/powerpc/kernel/head_fsl_booke.o
+
+ifeq ($(CONFIG_PPC32),y)
+head-$(CONFIG_6xx)		+= arch/powerpc/kernel/idle_6xx.o
+head-$(CONFIG_POWER4)		+= arch/powerpc/kernel/idle_power4.o
+head-$(CONFIG_PPC_FPU)		+= arch/powerpc/kernel/fpu.o
+endif
+
+core-y				+= arch/powerpc/kernel/ \
+				   arch/powerpc/mm/ \
+				   arch/powerpc/lib/ \
+				   arch/powerpc/sysdev/
+core-$(CONFIG_PPC32)		+= arch/ppc/kernel/ \
+				   arch/ppc/syslib/
+core-$(CONFIG_PPC64)		+= arch/ppc64/kernel/
+core-$(CONFIG_PPC_PMAC)		+= arch/powerpc/platforms/powermac/
+core-$(CONFIG_4xx)		+= arch/ppc/platforms/4xx/
+core-$(CONFIG_83xx)		+= arch/ppc/platforms/83xx/
+core-$(CONFIG_85xx)		+= arch/ppc/platforms/85xx/
+core-$(CONFIG_MATH_EMULATION)	+= arch/ppc/math-emu/
+core-$(CONFIG_XMON)		+= arch/powerpc/xmon/
+core-$(CONFIG_APUS)		+= arch/ppc/amiga/
+drivers-$(CONFIG_8xx)		+= arch/ppc/8xx_io/
+drivers-$(CONFIG_4xx)		+= arch/ppc/4xx_io/
+drivers-$(CONFIG_CPM2)		+= arch/ppc/8260_io/
+
+drivers-$(CONFIG_OPROFILE)	+= arch/powerpc/oprofile/
+
+BOOT_TARGETS = zImage zImage.initrd znetboot znetboot.initrd vmlinux.sm
+
+.PHONY: $(BOOT_TARGETS)
+
+all: uImage zImage
+
+CPPFLAGS_vmlinux.lds	:= -Upowerpc
+
+# All the instructions talk about "make bzImage".
+bzImage: zImage
+
+boot := arch/$(ARCH)/boot
+
+$(BOOT_TARGETS): vmlinux
+	$(Q)$(MAKE) $(build)=$(boot) $@
+
+uImage: vmlinux
+	$(Q)$(MAKE) $(build)=$(boot)/images $(boot)/images/$@
+
+define archhelp
+  @echo '* zImage          - Compressed kernel image (arch/$(ARCH)/boot/images/zImage.*)'
+  @echo '  uImage          - Create a bootable image for U-Boot / PPCBoot'
+  @echo '  install         - Install kernel using'
+  @echo '                    (your) ~/bin/installkernel or'
+  @echo '                    (distribution) /sbin/installkernel or'
+  @echo '                    install to $$(INSTALL_PATH) and run lilo'
+  @echo '  *_defconfig     - Select default config from arch/$(ARCH)/ppc/configs'
+endef
+
+archclean:
+	$(Q)$(MAKE) $(clean)=arch/ppc/boot
+	# Temporary hack until we have migrated to asm-powerpc
+	$(Q)rm -rf arch/$(ARCH)/include
+
+archprepare: checkbin
+
+# Temporary hack until we have migrated to asm-powerpc
+ifeq ($(CONFIG_PPC64),y)
+include/asm: arch/$(ARCH)/include/asm
+arch/$(ARCH)/include/asm:
+	$(Q)if [ ! -d arch/$(ARCH)/include ]; then mkdir -p arch/$(ARCH)/include; fi
+	$(Q)ln -fsn $(srctree)/include/asm-ppc64 arch/$(ARCH)/include/asm
+else
+include/asm: arch/$(ARCH)/include/asm
+arch/$(ARCH)/include/asm:
+	$(Q)if [ ! -d arch/$(ARCH)/include ]; then mkdir -p arch/$(ARCH)/include; fi
+	$(Q)ln -fsn $(srctree)/include/asm-ppc arch/$(ARCH)/include/asm
+endif
+
+# Use the file '.tmp_gas_check' for binutils tests, as gas won't output
+# to stdout and these checks are run even on install targets.
+TOUT	:= .tmp_gas_check
+# Ensure this is binutils 2.12.1 (or 2.12.90.0.7) or later for altivec
+# instructions.
+# gcc-3.4 and binutils-2.14 are a fatal combination.
+GCC_VERSION	:= $(call cc-version)
+
+checkbin:
+	@if test "$(GCC_VERSION)" = "0304" ; then \
+		if ! /bin/echo mftb 5 | $(AS) -v -mppc -many -o $(TOUT) >/dev/null 2>&1 ; then \
+			echo -n '*** ${VERSION}.${PATCHLEVEL} kernels no longer build '; \
+			echo 'correctly with gcc-3.4 and your version of binutils.'; \
+			echo '*** Please upgrade your binutils or downgrade your gcc'; \
+			false; \
+		fi ; \
+	fi
+	@if ! /bin/echo dssall | $(AS) -many -o $(TOUT) >/dev/null 2>&1 ; then \
+		echo -n '*** ${VERSION}.${PATCHLEVEL} kernels no longer build ' ; \
+		echo 'correctly with old versions of binutils.' ; \
+		echo '*** Please upgrade your binutils to 2.12.1 or newer' ; \
+		false ; \
+	fi
+
+CLEAN_FILES += $(TOUT)
+

arch/powerpc/kernel/Makefile

@@ -0,0 +1,18 @@
+#
+# Makefile for the linux kernel.
+#
+
+extra-$(CONFIG_PPC_STD_MMU)	:= head.o
+extra_$(CONFIG_PPC64)		:= head_64.o
+extra-$(CONFIG_40x)		:= head_4xx.o
+extra-$(CONFIG_44x)		:= head_44x.o
+extra-$(CONFIG_FSL_BOOKE)	:= head_fsl_booke.o
+extra-$(CONFIG_8xx)		:= head_8xx.o
+extra-$(CONFIG_6xx)		+= idle_6xx.o
+extra-$(CONFIG_POWER4)		+= idle_power4.o
+extra-$(CONFIG_PPC_FPU)		+= fpu.o
+extra-y				+= vmlinux.lds
+
+obj-y				:= semaphore.o traps.o process.o
+
+obj-$(CONFIG_ALTIVEC)		+= vecemu.o vector.o