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>

1 files changed, 222 insertions, 0 deletions

diff --git a/arch/powerpc/Makefile b/arch/powerpc/Makefile
new file mode 100644
index 000000000000..8a65e112211b
--- /dev/null
+++ b/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)
+