build: add a "user" arch to allow the kernel to run as a program on the host machine

arch/user/config.mk

@@ -0,0 +1,18 @@
+LD  := gcc
+CC  := gcc
+ASM := gcc
+OBJCOPY := objcopy
+STRIP := strip
+
+CFLAGS   :=
+ASMFLAGS := $(CFLAGS)
+LDFLAGS  :=
+
+ARCH_CFLAGS := -D_64BIT
+ARCH_LDFLAGS := 
+
+ARCH_DIR := arch/$(SOCKS_ARCH)
+
+ARCH_C_FILES := $(wildcard $(ARCH_DIR)/*.c) $(wildcard $(ARCH_DIR)/acpi/*.c)
+ARCH_ASM_FILES := $(wildcard $(ARCH_DIR)/*.S) $(wildcard $(ARCH_DIR)/acpi/*.S)
+ARCH_OBJ := $(addprefix $(BUILD_DIR)/,$(ARCH_C_FILES:.c=.o) $(ARCH_ASM_FILES:.S=.o))