312551131 lab 5 & lab 7

Lab 5/Makefile

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+SUBDIR	 = kernel  # bootloader
+
+BUILDSUBDIR = $(SUBDIR:%=build-%)
+CLEANSUBDIR = $(SUBDIR:%=clean-%)
+
+SD_DIR   = sd
+FS_DIR   = rootfs
+
+all: $(SD_DIR)/initrd.cpio $(BUILDSUBDIR)
+
+$(SD_DIR)/initrd.cpio:
+	cd $(SD_DIR)/$(FS_DIR) && ls -a | cpio -o -H newc > ../../$@ && cd ..
+
+$(BUILDSUBDIR):
+	@echo "===>" $@
+		$(MAKE) -C $(@:build-%=%)
+	@echo "<===" $@
+
+$(CLEANSUBDIR):
+	@echo "===>" $@
+		$(MAKE) -C $(@:clean-%=%) clean
+	@echo "<===" $@
+
+clean: $(CLEANSUBDIR)
+	rm -f $(SD_DIR)/*.cpio
+
+
+# $(call make_subdir, clean)
+
+.PHONY: all clean $(SUBDIR) $(BUILDSUBDIR) $(CLEANSUBDIR) $(SD_DIR)/initrd.cpio

Lab 5/docs/TODO.md

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+### Basic Exercise 1 - Buddy System - 40%
+
+**Todo**
+```
+Implement the buddy system fro contiguous page frames allocation and your max order should be larger than 5.
+
+(You don't need to handle the case of out-of-memory.)
+```
+
+
+**The Frame Array**
+```
+For each entry in The Frame Array with idx and value val
+(Suppose the framesize to be 4kb)
+
+val 
+    >= 0  : allocatable
+    = <F> : belongs to a larger block
+    = <X> : already allocated   
+
+Frame Freelists
+    linkedlists
+
+```
+
+
+
+
+### Basic Exercise 2 - -
+
+
+
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+