initial commit of lk (little kernel) project
diff --git a/arch/arm/rules.mk b/arch/arm/rules.mk
new file mode 100644
index 0000000..c8e3d5d
--- /dev/null
+++ b/arch/arm/rules.mk
@@ -0,0 +1,125 @@
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+TOOLCHAIN_PREFIX ?= arm-elf-
+
+ENABLE_THUMB ?= true
+
+CFLAGS += -finline
+
+DEFINES += \
+ ARM_CPU_$(ARM_CPU)=1
+
+# do set some options based on the cpu core
+HANDLED_CORE := false
+ifeq ($(ARM_CPU),cortex-a8)
+DEFINES += \
+ ARM_WITH_CP15=1 \
+ ARM_WITH_MMU=1 \
+ ARM_ISA_ARMv7=1 \
+ ARM_WITH_VFP=1 \
+ ARM_WITH_NEON=1 \
+ ARM_WITH_THUMB=1 \
+ ARM_WITH_THUMB2=1 \
+ ARM_WITH_CACHE=1 \
+ ARM_WITH_L2=1
+#CFLAGS += -mcpu=$(ARM_CPU)
+CFLAGS += -mcpu=arm1136jf-s # compiler doesn't understand cortex yet
+HANDLED_CORE := true
+#CFLAGS += -mfpu=vfp -mfloat-abi=softfp
+endif
+ifeq ($(ARM_CPU),arm1176jzf-s)
+DEFINES += \
+ ARM_WITH_CP15=1 \
+ ARM_WITH_MMU=1 \
+ ARM_ISA_ARMv6=1 \
+ ARM_WITH_VFP=1 \
+ ARM_WITH_THUMB=1 \
+ ARM_WITH_CACHE=1 \
+ ARM_CPU_ARM1136=1
+CFLAGS += -mcpu=$(ARM_CPU)
+HANDLED_CORE := true
+endif
+ifeq ($(ARM_CPU),arm926ej-s)
+DEFINES += \
+ ARM_WITH_CP15=1 \
+ ARM_WITH_MMU=1 \
+ ARM_ISA_ARMv5E=1 \
+ ARM_WITH_THUMB=1 \
+ ARM_WITH_CACHE=1 \
+ ARM_CPU_ARM9=1 \
+ ARM_CPU_ARM926=1
+CFLAGS += -mcpu=$(ARM_CPU)
+HANDLED_CORE := true
+endif
+ifeq ($(ARM_CPU),arm7tdmi)
+DEFINES += \
+ ARM_ISA_ARMv4=1 \
+ ARM_WITH_THUMB=1 \
+ ARM_CPU_ARM7=1
+CFLAGS += -mcpu=$(ARM_CPU)
+HANDLED_CORE := true
+endif
+
+ifneq ($(HANDLED_CORE),true)
+$(warning $(LOCAL_DIR)/rules.mk doesnt have logic for arm core $(ARM_CPU))
+$(warning this is likely to be broken)
+endif
+
+THUMBCFLAGS :=
+THUMBINTERWORK :=
+ifeq ($(ENABLE_THUMB),true)
+THUMBCFLAGS := -mthumb -D__thumb__
+THUMBINTERWORK := -mthumb-interwork
+endif
+
+CFLAGS += $(THUMBINTERWORK)
+
+INCLUDES += \
+ -I$(LOCAL_DIR)/include
+
+BOOTOBJS += \
+ $(LOCAL_DIR)/crt0.o
+
+OBJS += \
+ $(LOCAL_DIR)/arch.Ao \
+ $(LOCAL_DIR)/asm.o \
+ $(LOCAL_DIR)/cache.o \
+ $(LOCAL_DIR)/cache-ops.o \
+ $(LOCAL_DIR)/ops.o \
+ $(LOCAL_DIR)/exceptions.o \
+ $(LOCAL_DIR)/faults.o \
+ $(LOCAL_DIR)/mmu.o \
+ $(LOCAL_DIR)/thread.o
+
+# make sure some bits were set up
+MEMVARS_SET := 0
+ifneq ($(MEMBASE),)
+MEMVARS_SET := 1
+endif
+ifneq ($(MEMSIZE),)
+MEMVARS_SET := 1
+endif
+ifeq ($(MEMVARS_SET),0)
+$(error missing MEMBASE or MEMSIZE variable, please set in target rules.mk)
+endif
+
+LIBGCC := $(shell $(TOOLCHAIN_PREFIX)gcc $(CFLAGS) $(THUMBCFLAGS) -print-libgcc-file-name)
+#$(info LIBGCC = $(LIBGCC))
+
+# potentially generated files that should be cleaned out with clean make rule
+GENERATED += \
+ $(BUILDDIR)/system-onesegment.ld \
+ $(BUILDDIR)/system-twosegment.ld
+
+# rules for generating the linker scripts
+
+$(BUILDDIR)/system-onesegment.ld: $(LOCAL_DIR)/system-onesegment.ld
+ @echo generating $@
+ @$(MKDIR)
+ $(NOECHO)sed "s/%MEMBASE%/$(MEMBASE)/;s/%MEMSIZE%/$(MEMSIZE)/" < $< > $@
+
+$(BUILDDIR)/system-twosegment.ld: $(LOCAL_DIR)/system-twosegment.ld
+ @echo generating $@
+ @$(MKDIR)
+ $(NOECHO)sed "s/%ROMBASE%/$(ROMBASE)/;s/%MEMBASE%/$(MEMBASE)/;s/%MEMSIZE%/$(MEMSIZE)/" < $< > $@
+