explain project structure

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+Directory structure of the project:
+
+doc/
+build/
+      Makefile
+Makefile
+src/
+    lib/
+        rs232/
+              rs232.c
+              rs232.h
+    host/
+         pipe_image.c
+         makefs.c
+    arm/
+        common/
+               svc_interface.h
+               strings.c
+               io.h
+               io.c
+               strings.h
+        PL0/
+            PL0_utils.h
+            svc.S
+            PL0_utils.c
+            PL0_test.c
+            PL0_test.ld
+        PL1/
+            loader/
+                   loader_stage2.ld
+                   loader_stage2.c
+                   loader_stage1.S
+                   loader.ld
+            kernel/
+                   demo_functionality.c
+                   paging.h
+                   setup.c
+                   interrupts.h
+                   interrupt_vector.S
+                   kernel.ld
+                   scheduler.h
+                   atags.c
+                   translation_table_descriptors.h
+                   bcmclock.h
+                   ramfs.c
+                   kernel_stage1.S
+                   paging.c
+                   ramfs.h
+                   interrupts.c
+                   armclock.h
+                   atags.h
+                   kernel_stage2.ld
+                   cp_regs.h
+                   psr.h
+                   scheduler.c
+                   memory.h
+                   demo_functionality.h
+            PL1_common/
+                       global.h
+                       uart.h
+                       uart.c
+
+
+Meaning of significant directories and files:
+
+doc/
+Contains documentation of the project.
+
+build/
+Contains main Makefile of the project. All objects created during the build process are placed there.
+
+Makefile
+Proxies all calls to Makefile in build/.
+
+src/
+Contains all sources of the project.
+
+src/host/
+Contains sources of helper programs to be compiled using native GCC and run on the machine where development takes place.
+
+src/arm/
+Contains sources to be compiled using ARM cross-compiler GCC and run on the RaspberryPi.
+
+src/arm/common
+Contains sources used in both: privileged mode and unprivileged mode.
+
+src/arm/PL0
+Contains sources used exclusively in unprivileged, user-mode (PL0) program, as well as the program's linker script.
+
+src/arm/PL1
+Contains sources used exclusively in privileged (PL1) mode.
+
+src/arm/PL1/loader
+Contains sources used exclusively in the bootloader, as well as linker scripts for stages 1 and 2 of this bootloader.
+
+src/arm/PL1/kernel
+Contains sources used exclusively in the kernel, as well as linker scripts for stages 1 and 2 of this kernel.
+
+src/arm/PL1/PL1_common
+Contains sources used in both: kernel and bootloader.