changelog

思科路由器仿真器,用来仿7200系列得,可以在电脑上模拟路由器-Cisco router simulator, used to fake a 7200 series can be simulated

/*
 * Cisco 7200/3600/2691 simulation platform.
 */

15-Aug-2005, the project is starting.
	
18-Aug-2005
-----------
  - Added support for: sll, addu/subu.
  - Fixed bugs with b... branch instructions (bad computation of new pc).
  - Added patch recording for blocks.
  - A sequence of MIPS instructions (without memory access instructions)
    from IOS was successfully run ! (need to check correctness).

22-Aug-2005
-----------
  - Implemented a basic memory subsystem with an mmaped file.
  - Added memory access instructions (lb,lbu,lh,lhu,lw,lwu,ld,sb,sh,sw,sd).
  - Added a cross-compiled test program.
	
23-Aug-2005
-----------
  - Fixed slti, sltiu, slt instructions.
  - Fixed memory endianness.
  - Fixed host memory addressing (bad haddr computation).

24-Aug-2005
-----------
  - Added a generic memory address lookup function.
  - Added a minimal ELF loader.

28-Aug-2005
-----------
  - ELF loader now loads files page per page.
  - Added device support (with RAM support).
  - Added MTS32 support for mapping of 4 Kb pages.
  - Added MTS32 support for device mapping in kernel mode and generic
    virtual to physical mapping (preparation for TLB).
  - Added a dummy console driver.
  - Added mult,multu,div,divu instructions.
	
29-Aug-2005
-----------
  - Added a Red-Black trees module.
  - Block locator uses RB tree module.
  - It is now possible to run a program with multiple functions!
  - ELF loader now support multiple program headers and entry point is
    now used.
  - Fixed x86 buffer adjustment.
  - Modified console to be at the same address than c7200 DUART (to test
    microcode).
  - Memory access functions now update PC.
  - Added sra, srl, sllv, srlv, srav instructions.

30-Aug-2005
-----------
  - Added dsrl32, dsll32, dsra, dsrav, dsra32 instructions.
  - Added bgtz, blez, bgez instructions.
  - Fixed sltu instruction.
  - ELF Entry point is now sign-extended.
  - Added blezl, bgtzl instructions.
  - Fixed the MIPS scanner to use unsigned 64-bits integers for addresses.
  - Added unknown opcode management (basic, it just print the unhandled
    opcode value and continues).
  - Added cache instruction.
  - Added bltzal, bltzall, bgezal, bgezall instructions.

31-Aug-2005
-----------
  - Added System coprocessor (CP0) definitions.
  - Added tlbr instruction.
  - Added basic tlbwi instruction (doesn't change the MTS mappings now).
  - Added dmfc0, dmtc0, mfc0, mtc0 instructions.
  - Added TLB dump functions.
  - Added dummy pref/prefi instructions.	
  - Added basic exception trigger.
  - Added syscall, break instructions.
	
01-Sep-2005
-----------
  - Fixed exception trigger.
  - Added dmfc1, dmtc1, mfc1, mtc1, sdc1 instructions.
  - Fixed the break instruction.
  - Modified the memory handling to be more friendly with instructions
    like sdc1 and for more safety in case of badly written device drivers.
  - Added ldc1 instruction.

02-Sep-2005
-----------
  - Fixed sltiu/sltu instructions that were doing signed comparisons
    instead of unsigned comparisons (mis-use of jit).
  - Added lwr/lwl, swr/swl, ldl/ldr, sdr/sdl, ll/sc instructions 
    (not tested).	
  - Added PCI bus management.
  - Added GT64010 (PCI controller) device.
  - Added DEC 21050 (PCI bridge) device.
  - Added NVRAM.

03-Sep-2005
-----------
  - Beginning of work on IRQs.

04-Sep-2005
-----------
  - Timer IRQ should be OK.
  - Added C7200 bay management and Midplane FPGA.
  - Fixed the JR instruction which was broken in a case like that:
	lwu k1,0(k1)
	jr k1
	move k1,zero

05-Sep-2005
-----------
  - Fixed jalr (as jr) instruction.
  - Added RAM "aliasing".
  - Added SRAM management.
  - Fixed NVRAM size.
  - Fixed ldr, swl/swr instructions.
  - Added c7200 IOcard.
  - Count register is now properly handled.
  - Added basic functions to set/clear interrupts.
  - Modified the console driver to trigger DUART interrupt.
  - IOS now starts!
	
06-Sep-2005
-----------
  - Added "move" virtual instruction. It correspond to "addu" with rt=0.
    Here it avoids an useless add.
  - Added b/bal virtual instructions.
  - Packed NVRAM.

08-Sep-2005
-----------
  - Added Dallas DS1620 temperature sensors.
  - Added voltage sensors.
  - Power supplies are now faked.
  - IOS Environmental Monitor doesn't try to shutdown the router anymore!
  - Device list is now displayed at startup.
	
18-Sep-2005
-----------
  - Added Address Error Load/Save, TLB Load/Save exceptions.
    TODO: Branch Delay Slot management.
  - Modified the default value in config register in CP0 to set appropriate
    cache sizes. Now it is possible to boot compressed images directly!
  - Added the teq/teqi instructions.
  - Hmm, seen some IOS images (k9?) that seem to use the FPU (CP1). This
    does not prevent the image to boot, but some features will probably
    be not functional.
	
19-Sep-2005
-----------
  - Tweaked the console driver to generate a dummy interrupt. It avoids
    the console problems.
  - Fixed the serial driver mueslix PCI vendor/device code.
  - The midplane FPGA now returns voltages based on virtual PA EEPROM
    presence. Up to 6 PA-8T were successfully emulated!

20-Sep-2005
-----------
  - Included amd64-codegen.h with a (near empty) translator.
  - Some code factorization.
	
21-Sep-2005
-----------
  - Added CPU state save/restore on disk.
  - Sending SIGQUIT to the process dumps the MIPS64 VM state on disk.
    (only CPU state is saved for now).
    Device state is not saved, so this does not work with booted IOS images
    for now (it works for an IOS image being self-decompressing, though).
  - Some code cleanups.

23-Sep-2005
-----------
  - Fixed "Dirty" bit in TLB entries.
  - Extended the number of TLB entries from 48 to 64.
  - Added tlbp instruction.
  - Modified the nmc93c46 eeprom driver to allow more than 32 bytes reading.

24-Sep-2005
-----------
  - Added a symbol table loader.

26-Sep-2005
-----------
  - Added support for writing in PCI registers
  - Added a RAW file loader.
  - Added "add" instruction (without exception support).

07-Oct-2005
-----------
  - Continued work on SMP support.
	
08-Oct-2005
-----------
  - Replaced memory operations with fastcalls instead of asmlinkage functions.
  - Continued work on SMP support. Now it should be complete, except for
    LL/SC instructions.

10-Oct-2005
-----------
  - A lot of work on amd64 jit compiler.
  - The memory management should be 64-bit compliant now.
	
17-Oct-2005
-----------
  - Fixed a bug in SRA instruction in amd64 jit code. Dynamips is now working
    on amd64!

26-Oct-2005
-----------
  - Created a virtual device giving the VM parameters.
  - Added command line parsing (patch from Nicolas Szalay).
  - Fixed ERET instruction (LLbit clearing was lacking).
  - Fixed BREAK instruction (x86/amd64).
  - Fixed 2 GB limit for log file.
  - Fixed clobbered registers in x86 translation.
	 
28-Oct-2005
-----------
  - Added a non-JIT mode (not completely working now)
  - Added "-j" flag on the command line to disable JIT.
  - Fixed some stupid bugs in shift operations.

31-Oct-2005
-----------
  - Thanks to the great help of mtve, we have a working DEC21140 Ethernet
    driver and now the virtual C7200 can see the real world!!!

01-Nov-2005
-----------
  - Beginning of a NETIO module to handle network I/O with external world.
  - Studied (a bit) the PA-8T controller on a real router.
  - It is now possible to set the base MAC address of the router
    using the "-m" flag.
  - Improved logging
  - The dec21140 code is generalized and it is now possible to have a 
    PA-FE-TX in any slot.
	
02-Nov-2005
-----------
  - Fixed some problems with the NVRAM when it is empty ;
  - Added a "net_io.c" module that is an abstraction layer
    for network communications (TAP, Unix sockets...)
  - Added the "virtual" MIPS "li" instruction which
    is in fact "addiu reg,zero,value". This permits to have
    a more optimized JIT code.
  - Code factorization in the DEC21140 module.
  - mtve (aka "Mtv Europe") sent a patch for much better console handling,
    merge is planned on 03-Nov.
  - Added a "PA driver" framework.

03-Nov-2005
-----------
  - The console is better handled: special keys are working, and there
    is a FIFO buffer to avoid character loss (added a "dev_vtty.c" module).
  - Merging with Mtve patch, that cleans NETIO module and adds features
    to the console.
  - Added a clock divisor hack, but it is not completely working.
    todo: implement a command line option for this.	

08-Nov-2005
-----------
  - Mtve added tcp client/server NETIO.
  - The clock divisor is now working! It is set by the "-k" command line
    option.
  - Fixed the csr5 register handling in DEC21140 driver code.

13-Nov-2005
-----------
  - A lot of cosmetic changes from Mtve.
  - Modified the infrastructure to allow the use of CPU groups
    that share a certain number of devices (per-CPU device array).
    All device drivers have been modified to handle this.
  - Took a look at LSI ATMizer II+, which is the circuit used on
    PA-A3-OC3 boards. The ATMizer is based on a MIPS CPU, so it should
    be possible to emulate it.
  - Added a per-CPU dedicated thread.
	
23-Nov-2005
-----------
  - The PA-A1 ATM stuff is working!!!

24-Nov-2005
-----------
  - Fixed a bug in the PA-A1 driver in TX buffer chaining.

25-Nov-2005
-----------
  - Address bus masking, which clears bits 32 and 33 of physical addresses.
    It avoids the use of device aliasing.
  - Fixed the DEC21140 TX part which was incomplete.

29-Nov-2005
-----------
  - There are still bugs in big packet forwarding. This is probably the ATM
    driver (added more debugging info).
  - Fabien Devaux wrote a README explaining the command line options.
	
30-Nov-2005
-----------
  - Code cleanup in the net_io module.
  - Added the "ptask" (periodic tasks) module, this is mainly for TX ring
    scanning of network devices.

01-Dec-2005
-----------
  - Added a memory logger (FIFO of 10 accesses), this was useful to debug the
    PA-A1 RX problem.
  - Fixed a RX buffer chaining problem in PA-A1.

02-Dec-2005
-----------
  - Added support for PA-A1 reset ("clear int", "shut/no shut").
  - Optimized the IRQ handling (irq_pending flag in CPU structure
    is used as a "cache").

05-Dec-2005
-----------
  - Optimized the cp0 count/compare process for the x86_64 platform
    (unfortunately, this doesn't work for the x86 platform).

06-Dec-2005
-----------
  - Modified the NVRAM handling to allow calendar emulation ("sh calendar" is
    now working).

12-Dec-2005
-----------
  - Added support for the NPE-400.
  - Playing with the PA-POS-2OC3 (called "Charlotte" by Cisco).

15-Dec-2005
-----------
  - Added teq/teqi instructions to the x86_64 jit.

20-Dec-2005
-----------
  - Added a Virtual ATM switch fabric to emulate an ATM backbone.

22-Dec-2005
-----------
  - Final release for 0.2.2 train (0.2.2i).
	
23-Dec-2005
-----------
  - Starting 0.2.3 train (0.2.3a)
  - Added proper NPE-150 support.
  - Added bit-bucket support (zeroed memory zone).
  - Added NPE type selection.

24-Dec-2005
-----------
  - Added beginning of support for NPE-300 (endianness problems with PCI
    controllers ?)

28-Dec-2005
-----------
  - Fixed the endianness problem with the NPE-300.
  - Added NPE300-IO-FE.

31-Dec-2005
-----------
  - Added CLI option to load a symbol file.
  - Moved JIT code from dynamips.c to mips64_jit.c
  - Added support for NPE-100.
  - Updated the README file for NPE type selection.
  - Suppressed the annoying message "%%Error: Unrecognized I/O card in bay 0"

03-Jan-2006
-----------
  - The bit clearing in physical addresses was done stupidly.
    Only the bit 33 is used to bypass L2 caching. 
    Re-introduced SRAM aliasing.
    PHY address 0x100000000 is in fact for PCI I/O space.
  - Began to play with the Cirrus Logic PD6729.
  - Added Bootflash based on Intel 28F008SA chips (1 Mb)
  - Fixed the alignment error occuring with "show version".

04-Jan-2006
-----------
  - Better understanding of Flash SIMM register with bank number and bank
    size: modified the Flash SIMM code to handle a 8 Mb flash in 1 bank
    (emulation of Intel 28F016SA chip) which should be sufficient to store 
    crashinfo files or misc files like configs,...
  - Added ROM remote logging capabilities (with remote emulator control).

05-Jan-2006
-----------
  - Integrated HEC and AAL5 field computation functions found at:
    http://cell-relay.indiana.edu/cell-relay/publications/software/CRC/
    (Author is Charles Michael Heard).
  - Added HEC field management to the virtual ATM switch fabric.
  - Added HEC and AAL5 CRC fields to the TX part of the TNETA1570 driver.

06-Jan-2006
-----------
  - Added block timestamping, to evaluate use of JIT blocks and eventually
    enhance algorithm of block classifying.
  - Added a flag to the virtual devices to prevent use of MMAPed zones
    by MTS (used by NVRAM driver).
  - Added functions to extract IOS configuration from NVRAM.
    Pressing "Ctrl-] + c" nows write configuration to disk at any time.
	
08-Jan-2006
-----------
  - Added support for PEM (NPE-B) EEPROM. It will probably allow support
    of NPE-175/NPE-225.

09-Jan-2006
-----------
  - Added support for NPE-175/NPE-225 and added NPEB-IO-FE.

10-Jan-2006
-----------
  - Enhancements to the remote console over TCP port.
  - Port to the Cygwin environment, allowing the emulator to run on Windows
    machines!

11-Jan-2006
-----------
  - Added a feature to push an IOS configuration into NVRAM ("-C" command line
    option). 
  - Added enhanced checks to the NVRAM config export.
  - Added a variant of udp_connect() function for systems that do not support
    RFC 2553.
  - Added support for AUX port (TCP port).

12-Jan-2006
-----------
  - Better memory logger.
  - Added breakpoint capabilities.
  - Fixed a segfault occuring on some IOS images with x86_64 JIT.
    (modified the minimum remaining size in JIT buffer adjustment).

13-Jan-2006
-----------
  - The ROM is now embedded in the source code (added an utility to convert
    ELF file to C code). It is possible to use an alternate ROM using the
    "-R" option.
  - Enhanced the MTS lookups to allow use of embedded ROM for code execution.