build: Add build pipeline groundwork

Signed-off-by: Chloe M. <chloe@yiffware.org>

service/ptos/arch/amd64/Makefile

@@ -0,0 +1,48 @@
+#
+# Copyright (c) 2026, Chloe M.
+# Provided under the BSD-3 clause
+#
+# Description:  AMD64 port build script
+# Author:		Chloe M.
+#
+
+.SILENT:
+include ../../../mk/ptos.mk
+
+ASMFILES = $(shell find . -name "*.S")
+ASMOFILES = $(ASMFILES:.S=.S.o)
+
+CFILES = $(shell find . -name "*.c")
+OFILES = $(CFILES:.c=.o)
+CDFILES = $(OFILES:.o.d)
+ASMDFILES = $(ASMOFILES:.S.o=.S.d)
+
+MISC_OFILES = $(shell find $(PT_PROJECT_ROOT)/service/ptos/ -name "*.o")
+KERNEL_PATH =       \
+	$(PT_PROJECT_ROOT)/artifacts/ptsv.sys
+
+CFLAGS =				\
+	$(SYS_CFLAGS)		\
+	-I../../target		\
+	-I../../head/		\
+	-D_KERNEL			\
+	-MMD				\
+	-I$(PT_PROJECT_ROOT)/sdk/head \
+
+.PHONY: all
+all: bin
+
+.PHONY: bin
+bin: $(OFILES) $(ASMOFILES)
+	$(PROMPT) "LD" $(KERNEL_PATH)
+	$(SYS_LD) -Tdev/link.ld $(MISC_OFILES) -o $(KERNEL_PATH)
+
+-include $(CDFILES)
+%.o: %.c
+	$(PROMPT) "CC" $<
+	$(SYS_CC) -c $< $(CFLAGS) -o $@
+
+-include $(ASMDFILES)
+%.S.o: %.S
+	$(PROMPT) "AS" $<
+	$(SYS_CC) -c $< $(CFLAGS) -o $@