~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~- xv6 memory paging This project is part of an Operating Systems course taken in BGU. We introduce a 2-level paging mechanism. There are 4 paging policies: NONE, FIFO, SCFIFO and NFU. These policies are invoked with the SELECTION flag when launching, i.e. $ make clean qemu SELECTION=FIFO If the flag isn't defined at launch, then NFU is used. There are three places where the level of printing can be decided for the tests (in addition to the flag VERBOSE_PRINT) by setting the DEBUG constant to either a zero or a non-zero value. The default for all three is zero, which means minimal printing. Setting a non-zero variable would enable verbose printing. The options are as follows: 1. proc.c - would print out info about the pages that are in memory. 2. myMemTest.c - would perform more memory I-O and print accordingly. 3. vm.c - would print out the chosen pages to be paged out by the current policy. For further information, consult the assignment description at https://www.cs.bgu.ac.il/~os162/Assignments/Assignment_3 The original README is left intact below. Copyright 2016 Asaf Chelouche, Asaf Benjamin ~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~-~- xv6 is a re-implementation of Dennis Ritchie's and Ken Thompson's Unix Version 6 (v6). xv6 loosely follows the structure and style of v6, but is implemented for a modern x86-based multiprocessor using ANSI C. ACKNOWLEDGMENTS xv6 is inspired by John Lions's Commentary on UNIX 6th Edition (Peer to Peer Communications; ISBN: 1-57398-013-7; 1st edition (June 14, 2000)). See also http://pdos.csail.mit.edu/6.828/2014/xv6.html, which provides pointers to on-line resources for v6. xv6 borrows code from the following sources: JOS (asm.h, elf.h, mmu.h, bootasm.S, ide.c, console.c, and others) Plan 9 (entryother.S, mp.h, mp.c, lapic.c) FreeBSD (ioapic.c) NetBSD (console.c) The following people have made contributions: Russ Cox (context switching, locking) Cliff Frey (MP) Xiao Yu (MP) Nickolai Zeldovich Austin Clements In addition, we are grateful for the bug reports and patches contributed by Silas Boyd-Wickizer, Peter Froehlich, Shivam Handa, Anders Kaseorg, Eddie Kohler, Yandong Mao, Hitoshi Mitake, Carmi Merimovich, Joel Nider, Greg Price, Eldar Sehayek, Yongming Shen, Stephen Tu, and Zouchangwei. The code in the files that constitute xv6 is Copyright 2006-2014 Frans Kaashoek, Robert Morris, and Russ Cox. ERROR REPORTS If you spot errors or have suggestions for improvement, please send email to Frans Kaashoek and Robert Morris (kaashoek,rtm@csail.mit.edu). BUILDING AND RUNNING XV6 To build xv6 on an x86 ELF machine (like Linux or FreeBSD), run "make". On non-x86 or non-ELF machines (like OS X, even on x86), you will need to install a cross-compiler gcc suite capable of producing x86 ELF binaries. See http://pdos.csail.mit.edu/6.828/2014/tools.html. Then run "make TOOLPREFIX=i386-jos-elf-". To run xv6, install the QEMU PC simulators. To run in QEMU, run "make qemu". To create a typeset version of the code, run "make xv6.pdf". This requires the "mpage" utility. See http://www.mesa.nl/pub/mpage/.