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CS134a: Modern OS (Week 8)

CS134a: Modern OS (Week 8). Two rounds of research 1980’s: modularity and micro-kernels Mach (CMU; Rashid, ...) Amoeba (Vrije; Tannenbaum, ...) X-Kernel (U. Arizona; Peterson, ...) V (Stanford; Cheriton, ...) 1990’s: minimalism ExoKernel (MIT; Kaashok, ...) Vino (Harvard; Seltzer, ...)

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CS134a: Modern OS (Week 8)

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  1. CS134a: Modern OS (Week 8) • Two rounds of research • 1980’s: modularity and micro-kernels • Mach (CMU; Rashid, ...) • Amoeba (Vrije; Tannenbaum, ...) • X-Kernel (U. Arizona; Peterson, ...) • V (Stanford; Cheriton, ...) • 1990’s: minimalism • ExoKernel (MIT; Kaashok, ...) • Vino (Harvard; Seltzer, ...) • SPIN (U. Washington; Bershad, ...) Computing Systems

  2. But first lab 3! • You will implement part of a FAT filesystem • MSDOS *msdos_open(const char *devname) • void msdos_close(MSDOS *dosp) • int msdos_ls(MSDOS *dosp); • int msdos_cd(MSDOS *dosp, const char *name); • int msdos_rm(MSDOS *dosp, const char *name); • int msdos_save(MSDOS *dosp, const char *name); Computing Systems

  3. FAT filesystem structure Computing Systems

  4. Boot sector Computing Systems

  5. FAT tables Computing Systems

  6. First entry is reserved First FAT entry Computing Systems

  7. Other FAT entries Computing Systems

  8. FAT12 packing Computing Systems

  9. Directory Entry Computing Systems

  10. Entry Attributes Computing Systems

  11. Minimal kernel ExoKernel Computing Systems

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