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XV6 Source Code Reading -- Process and Thread

Presentation Slides

Requirement

Code to read

  • Basic headers
    • types.h (p.1)
    • param.h (p.1)
    • memlayout.h (p.2)
    • defs.h (p.2)
    • x86.h (p.4)
    • asm.h (p.6)
    • mmu.h (p.7)
    • elf.h (p.9)
  • Processes
    • vm.c (p.17)
    • proc.h (p.23)
    • proc.c (p.24)
    • swtch.S (p.30)
    • kalloc.c (p.31)

Tracing Code

Basic headers

types.h

  • some typedef of unsigned variable
    • unsigned int -> uint -> pde_t
    • unsigned short -> ushort
    • unsigned char -> uchar

param.h

  • some global define

memlayout.h - Memory Layout

  • seems like memory address things

defs.h

  • definitions of many file
    • bio.c
    • console.c
    • exec.c
    • file.c
    • fs.c
    • ide.c
    • ioapic.c
    • kalloc.c
    • kbd.c
    • lapic.c
    • log.c
    • mp.c
    • picirq.c
    • pipe.c
    • proc.c
    • swtch.S
    • spinlock.c
    • sleeplock.c
    • string.c
    • syscall.c
    • timer.c
    • trap.c
    • uart.c
    • vm.c
  • and some struct definition

x86.h

Routines to let C code use special x86 instructions.

  • Layout of the trap frame

asm.h

Assembler macros to create x86 segments

mmu.h - Memory Management Unit

This file contains definitions for the x86 memory management unit

  • lot of define of memory address
    • Eflags register (FL)
    • Control Register flags (CR)
    • Various segment selectors (SEG)
  • In __ASSEMBLER__
    • Segment Descriptor
    • Normal segment (SEG)
    • Application segment type bits (STA)
    • System segment type bits (STS)
    • page directory index (PDX)
    • page table index (PTX)
    • construct virtual address from indexes and offset (PGADDR)
    • Page directory and page table constants
    • Page table/directory entry flags
    • Address in page table or page directory entry
  • Task state segment format

elf.h

Format of an ELF executable file

Processes

vm.c - Virtual Memory

  • some abbreviation
    • va: virtual address
    • pa: physical address

Related Notes

Page Table

wiki page table

PTE Page Table Entry

MMU Memory Management Unit

TLB Translation Lookaside Buffer

wiki page table action

Resources

Slides

Book

  • book-rev10
    • Ch1 Operating system organization
      • Process overview
      • Code: Creating the first process
      • Code: Running the first process
    • Ch5 Scheduling
      • Multiplexing
      • Code: Context switching
      • Code: Scheduling