/[gxemul]/trunk/HISTORY
This is repository of my old source code which isn't updated any more. Go to git.rot13.org for current projects!
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revision 30 by dpavlin, Mon Oct 8 16:20:40 2007 UTC revision 38 by dpavlin, Mon Oct 8 16:21:53 2007 UTC
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1  $Id: HISTORY,v 1.1325 2006/08/15 15:38:37 debug Exp $  $Id: HISTORY,v 1.1515 2007/04/14 05:39:46 debug Exp $
2    
3  Changelog for GXemul:  Changelog for GXemul:
4  ---------------------  ---------------------
# Line 2937  Changelog for GXemul: Line 2937  Changelog for GXemul:
2937    
2938  ==============  RELEASE 0.4.2  ==============  ==============  RELEASE 0.4.2  ==============
2939    
2940    20060816        Adding a framework for emulated/virtual timers (src/timer.c),
2941                    using only setitimer().
2942                    Rewriting the mc146818 to use the new timer framework.
2943    20060817        Adding a call to gettimeofday() every now and then (once every
2944                    second, at the moment) to resynch the timer if it drifts.
2945                    Beginning to convert the ISA timer interrupt mechanism (8253
2946                    and 8259) to use the new timer framework.
2947                    Removing the -I command line option.
2948    20060819        Adding the -I command line option again, with new semantics.
2949                    Working on Footbridge timer interrupts; NetBSD/NetWinder and
2950                    NetBSD/CATS now run at correct speed, but unfortunately with
2951                    HUGE delays during bootup.
2952    20060821        Some minor m68k updates. Adding the first instruction: nop. :)
2953                    Minor Alpha emulation updates.
2954    20060822        Adding a FreeBSD development specific YAMON environment
2955                    variable ("khz") (as suggested by Bruce M. Simpson).
2956                    Moving YAMON environment variable initialization from
2957                    machine_evbmips.c into promemul/yamon.c, and adding some more
2958                    variables.
2959                    Continuing on the LCA PCI bus controller (for Alpha machines).
2960    20060823        Continuing on the timer stuff: experimenting with MIPS count/
2961                    compare interrupts connected to the timer framework.
2962    20060825        Adding bogus SCSI commands 0x51 (SCSICDROM_READ_DISCINFO) and
2963                    0x52 (SCSICDROM_READ_TRACKINFO) to the SCSI emulation layer,
2964                    to allow NetBSD/pmax 4.0_BETA to be installed from CDROM.
2965                    Minor updates to the LCA PCI controller.
2966    20060827        Implementing a CHIP8 cpu mode, and a corresponding CHIP8
2967                    machine, for fun. Disassembly support for all instructions,
2968                    and most of the common instructions have been implemented: mvi,
2969                    mov_imm, add_imm, jmp, rand, cls, sprite, skeq_imm, jsr,
2970                    skne_imm, bcd, rts, ldr, str, mov, or, and, xor, add, sub,
2971                    font, ssound, sdelay, gdelay, bogus skup/skpr, skeq, skne.
2972    20060828        Beginning to convert the CHIP8 cpu in the CHIP8 machine to a
2973                    (more correct) RCA 180x cpu. (Disassembly for all 1802
2974                    instructions has been implemented, but no execution yet, and
2975                    no 1805 extended instructions.)
2976    20060829        Minor Alpha emulation updates.
2977    20060830        Beginning to experiment a little with PCI IDE for SGI O2.
2978                    Fixing the cursor key mappings for MobilePro 770 emulation.
2979                    Fixing the LK201 warning caused by recent NetBSD/pmax.
2980                    The MIPS R41xx standby, suspend, and hibernate instructions now
2981                    behave like the RM52xx/MIPS32/MIPS64 wait instruction.
2982                    Fixing dev_wdc so it calculates correct (64-bit) offsets before
2983                    giving them to diskimage_access().
2984    20060831        Continuing on Alpha emulation (OSF1 PALcode).
2985    20060901        Minor Alpha updates; beginning on virtual memory pagetables.
2986                    Removed the limit for max nr of devices (in preparation for
2987                    allowing devices' base addresses to be changed during runtime).
2988                    Adding a hack for MIPS [d]mfc0 select 0 (except the count
2989                    register), so that the coproc register is simply copied.
2990                    The MIPS suspend instruction now exits the emulator, instead
2991                    of being treated as a wait instruction (this causes NetBSD/
2992                    hpcmips to get correct 'halt' behavior).
2993                    The VR41xx RTC now returns correct time.
2994                    Connecting the VR41xx timer to the timer framework (fixed at
2995                    128 Hz, for now).
2996                    Continuing on SPARC emulation, adding more instructions:
2997                    restore, ba_xcc, ble. The rectangle drawing demo works :)
2998                    Removing the last traces of the old ENABLE_CACHE_EMULATION
2999                    MIPS stuff (not usable with dyntrans anyway).
3000    20060902        Splitting up src/net.c into several smaller files in its own
3001                    subdirectory (src/net/).
3002    20060903        Cleanup of the files in src/net/, to make them less ugly.
3003    20060904        Continuing on the 'settings' subsystem.
3004                    Minor progress on the SPARC emulation mode.
3005    20060905        Cleanup of various things, and connecting the settings
3006                    infrastructure to various subsystems (emul, machine, cpu, etc).
3007                    Changing the lk201 mouse update routine to not rely on any
3008                    emulated hardware framebuffer cursor coordinates, but instead
3009                    always do (semi-usable) relative movements.
3010    20060906        Continuing on the lk201 mouse stuff. Mouse behaviour with
3011                    multiple framebuffers (which was working in Ultrix) is now
3012                    semi-broken (but it still works, in a way).
3013                    Moving the documentation about networking into its own file
3014                    (networking.html), and refreshing it a bit. Adding an example
3015                    of how to use ethernet frame direct-access (udp_snoop).
3016    20060907        Continuing on the settings infrastructure.
3017    20060908        Minor updates to SH emulation: for 32-bit emulation: delay
3018                    slots and the 'jsr @Rn' instruction. I'm putting 64-bit SH5 on
3019                    ice, for now.
3020    20060909-10     Implementing some more 32-bit SH instructions. Removing the
3021                    64-bit mode completely. Enough has now been implemented to run
3022                    the rectangle drawing demo. :-)
3023    20060912        Adding more SH instructions.
3024    20060916        Continuing on SH emulation (some more instructions: div0u,
3025                    div1, rotcl/rotcr, more mov instructions, dt, braf, sets, sett,
3026                    tst_imm, dmuls.l, subc, ldc_rm_vbr, movt, clrt, clrs, clrmac).
3027                    Continuing on the settings subsystem (beginning on reading/
3028                    writing settings, removing bugs, and connecting more cpus to
3029                    the framework).
3030    20060919        More work on SH emulation; adding an ldc banked instruction,
3031                    and attaching a 640x480 framebuffer to the Dreamcast machine
3032                    mode (NetBSD/dreamcast prints the NetBSD copyright banner :-),
3033                    and then panics).
3034    20060920        Continuing on the settings subsystem.
3035    20060921        Fixing the Footbridge timer stuff so that NetBSD/cats and
3036                    NetBSD/netwinder boot up without the delays.
3037    20060922        Temporarily hardcoding MIPS timer interrupt to 100 Hz. With
3038                    'wait' support disabled, NetBSD/malta and Linux/malta run at
3039                    correct speed.
3040    20060923        Connecting dev_gt to the timer framework, so that NetBSD/cobalt
3041                    runs at correct speed.
3042                    Moving SH4-specific memory mapped registers into its own
3043                    device (dev_sh4.c).
3044                    Running with -N now prints "idling" instead of bogus nr of
3045                    instrs/second (which isn't valid anyway) while idling.
3046    20060924        Algor emulation should now run at correct speed.
3047                    Adding disassembly support for some MIPS64 revision 2
3048                    instructions: ext, dext, dextm, dextu.
3049    20060926        The timer framework now works also when the MIPS wait
3050                    instruction is used.
3051    20060928        Re-implementing checks for coprocessor availability for MIPS
3052                    cop0 instructions. (Thanks to Carl van Schaik for noticing the
3053                    lack of cop0 availability checks.)
3054    20060929        Implementing an instruction combination hack which treats
3055                    NetBSD/pmax' idle loop as a wait-like instruction.
3056    20060930        The ENTRYHI_R_MASK was missing in (at least) memory_mips_v2p.c,
3057                    causing TLB lookups to sometimes succeed when they should have
3058                    failed. (A big thank you to Juli Mallett for noticing the
3059                    problem.)
3060                    Adding disassembly support for more MIPS64 revision 2 opcodes
3061                    (seb, seh, wsbh, jalr.hb, jr.hb, synci, ins, dins, dinsu,
3062                    dinsm, dsbh, dshd, ror, dror, rorv, drorv, dror32). Also
3063                    implementing seb, seh, dsbh, dshd, and wsbh.
3064                    Implementing an instruction combination hack for Linux/pmax'
3065                    idle loop, similar to the NetBSD/pmax case.
3066    20061001        Changing the NetBSD/sgimips install instructions to extract
3067                    files from an iso image, instead of downloading them via ftp.
3068    20061002        More-than-31-bit userland addresses in memory_mips_v2p.c were
3069                    not actually working; applying a fix from Carl van Schaik to
3070                    enable them to work + making some other updates (adding kuseg
3071                    support).
3072                    Fixing hpcmips (vr41xx) timer initialization.
3073                    Experimenting with O(n)->O(1) reduction in the MIPS TLB lookup
3074                    loop. Seems to work both for R3000 and non-R3000.
3075    20061003        Continuing a little on SH emulation (adding more control
3076                    registers; mini-cleanup of memory_sh.c).
3077    20061004        Beginning on a dev_rtc, a clock/timer device for the test
3078                    machines; also adding a demo, and some documentation.
3079                    Fixing a bug in SH "mov.w @(disp,pc),Rn" (the result wasn't
3080                    sign-extended), and adding the addc and ldtlb instructions.
3081    20061005        Contining on SH emulation: virtual to physical address
3082                    translation, and a skeleton exception mechanism.
3083    20061006        Adding more SH instructions (various loads and stores, rte,
3084                    negc, muls.w, various privileged register-move instructions).
3085    20061007        More SH instructions: various move instructions, trapa, div0s,
3086                    float, fdiv, ftrc.
3087                    Continuing on dev_rtc; removing the rtc demo.
3088    20061008        Adding a dummy Dreamcast PROM module. (Homebrew Dreamcast
3089                    programs using KOS libs need this.)
3090                    Adding more SH instructions: "stc vbr,rn", rotl, rotr, fsca,
3091                    fmul, fadd, various floating-point moves, etc. A 256-byte
3092                    demo for Dreamcast runs :-)
3093    20061012        Adding the SH "lds Rm,pr" and bsr instructions.
3094    20061013        More SH instructions: "sts fpscr,rn", tas.b, and some more
3095                    floating point instructions, cmp/str, and more moves.
3096                    Adding a dummy dev_pvr (Dreamcast graphics controller).
3097    20061014        Generalizing the expression evaluator (used in the built-in
3098                    debugger) to support parentheses and +-*/%^&|.
3099    20061015        Removing the experimental tlb index hint code in
3100                    mips_memory_v2p.c, since it didn't really have any effect.
3101    20061017        Minor SH updates; adding the "sts pr,Rn", fcmp/gt, fneg,
3102                    frchg, and some other instructions. Fixing missing sign-
3103                    extension in an 8-bit load instruction.
3104    20061019        Adding a simple dev_dreamcast_rtc.
3105                    Implementing memory-mapped access to the SH ITLB/UTLB arrays.
3106    20061021        Continuing on various SH and Dreamcast things: sh4 timers,
3107                    debug messages for dev_pvr, fixing some virtual address
3108                    translation bugs, adding the bsrf instruction.
3109                    The NetBSD/dreamcast GENERIC_MD kernel now reaches userland :)
3110                    Adding a dummy dev_dreamcast_asic.c (not really useful yet).
3111                    Implementing simple support for Store Queues.
3112                    Beginning on the PVR Tile Accelerator.
3113    20061022        Generalizing the PVR framebuffer to support off-screen drawing,
3114                    multiple bit-depths, etc. (A small speed penalty, but most
3115                    likely worth it.)
3116                    Adding more SH instructions (mulu.w, fcmp/eq, fsub, fmac,
3117                    fschg, and some more); correcting bugs in "fsca" and "float".
3118    20061024        Adding the SH ftrv (matrix * vector) instruction. Marcus
3119                    Comstedt's "tatest" example runs :) (wireframe only).
3120                    Correcting disassembly for SH floating point instructions that
3121                    use the xd* registers.
3122                    Adding the SH fsts instruction.
3123                    In memory_device_dyntrans_access(), only the currently used
3124                    range is now invalidated, and not the entire device range.
3125    20061025        Adding a dummy AVR32 cpu mode skeleton.
3126    20061026        Various Dreamcast updates; beginning on a Maple bus controller.
3127    20061027        Continuing on the Maple bus. A bogus Controller, Keyboard, and
3128                    Mouse can now be detected by NetBSD and KOS homebrew programs.
3129                    Cleaning up the SH4 Timer Management Unit, and beginning on
3130                    SH4 interrupts.
3131                    Implementing the Dreamcast SYSASIC.
3132    20061028        Continuing on the SYSASIC.
3133                    Adding the SH fsqrt instruction.
3134                    memory_sh.c now actually scans the ITLB.
3135                    Fixing a bug in dev_sh4.c, related to associative writes into
3136                    the memory-mapped UTLB array. NetBSD/dreamcast now reaches
3137                    userland stably, and prints the "Terminal type?" message :-]
3138                    Implementing enough of the Dreamcast keyboard to make NetBSD
3139                    accept it for input.
3140                    Enabling SuperH for stable (non-development) builds.
3141                    Adding NetBSD/dreamcast to the documentation, although it
3142                    doesn't support root-on-nfs yet.
3143    20061029        Changing usleep(1) calls in the debugger to usleep(10000)
3144                    (according to Brian Foley, this makes GXemul run better on
3145                    MacOS X).
3146                    Making the Maple "Controller" do something (enough to barely
3147                    interact with dcircus.elf).
3148    20061030-31     Some progress on the PVR. More test programs start running (but
3149                    with strange output).
3150                    Various other SH4-related updates.
3151    20061102        Various Dreamcast and SH4 updates; more KOS demos run now.
3152    20061104        Adding a skeleton dev_mb8696x.c (the Dreamcast's LAN adapter).
3153    20061105        Continuing on the MB8696x; NetBSD/dreamcast detects it as mbe0.
3154                    Testing for the release.
3155    
3156    ==============  RELEASE 0.4.3  ==============
3157    
3158    20061107        Adding a new disk image option (-d o...) which sets the ISO9660
3159                    filesystem base offset; also making some other hacks to allow
3160                    NetBSD/dreamcast and homebrew demos/games to boot directly
3161                    from a filesystem image.
3162                    Moving Dreamcast-specific stuff in the documentation to its
3163                    own page (dreamcast.html).
3164                    Adding a border to the Dreamcast PVR framebuffer.
3165    20061108        Adding a -T command line option (again?), for halting the
3166                    emulator on unimplemented memory accesses.
3167    20061109        Continuing on various SH4 and Dreamcast related things.
3168                    The emulator should now halt on more unimplemented device
3169                    accesses, instead of just printing a warning, forcing me to
3170                    actually implement missing stuff :)
3171    20061111        Continuing on SH4 and Dreamcast stuff.
3172                    Adding a bogus Landisk (SH4) machine mode.
3173    20061112        Implementing some parts of the Dreamcast GDROM device. With
3174                    some ugly hacks, NetBSD can (barely) mount an ISO image.
3175    20061113        NetBSD/dreamcast now starts booting from the Live CD image,
3176                    but crashes randomly quite early on in the boot process.
3177    20061122        Beginning on a skeleton interrupt.h and interrupt.c for the
3178                    new interrupt subsystem.
3179    20061124        Continuing on the new interrupt system; taking the first steps
3180                    to attempt to connect CPUs (SuperH and MIPS) and devices
3181                    (dev_cons and SH4 timer interrupts) to it. Many things will
3182                    probably break from now on.
3183    20061125        Converting dev_ns16550, dev_8253 to the new interrupt system.
3184                    Attempting to begin to convert the ISA bus.
3185    20061130        Incorporating a patch from Brian Foley for the configure
3186                    script, which checks for X11 libs in /usr/X11R6/lib64 (which
3187                    is used on some Linux systems).
3188    20061227        Adding a note in the man page about booting from Dreamcast
3189                    CDROM images (i.e. that no external kernel is needed).
3190    20061229        Continuing on the interrupt system rewrite: beginning to
3191                    convert more devices, adding abort() calls for legacy interrupt
3192                    system calls so that everything now _has_ to be rewritten!
3193                    Almost all machine modes are now completely broken.
3194    20061230        More progress on removing old interrupt code, mostly related
3195                    to the ISA bus + devices, the LCA bus (on AlphaBook1), and
3196                    the Footbridge bus (for CATS). And some minor PCI stuff.
3197                    Connecting the ARM cpu to the new interrupt system.
3198                    The CATS, NetWinder, and QEMU_MIPS machine modes now work with
3199                    the new interrupt system :)
3200    20061231        Connecting PowerPC CPUs to the new interrupt system.
3201                    Making PReP machines (IBM 6050) work again.
3202                    Beginning to convert the GT PCI controller (for e.g. Malta
3203                    and Cobalt emulation). Some things work, but not everything.
3204                    Updating Copyright notices for 2007.
3205    20070101        Converting dev_kn02 from legacy style to devinit; the 3max
3206                    machine mode now works with the new interrupt system :-]
3207    20070105        Beginning to convert the SGI O2 machine to the new interrupt
3208                    system; finally converting O2 (IP32) devices to devinit, etc.
3209    20070106        Continuing on the interrupt system redesign/rewrite; KN01
3210                    (PMAX), KN230, and Dreamcast ASIC interrupts should work again,
3211                    moving out stuff from machine.h and devices.h into the
3212                    corresponding devices, beginning the rewrite of i80321
3213                    interrupts, etc.
3214    20070107        Beginning on the rewrite of Eagle interrupt stuff (PReP, etc).
3215    20070117        Beginning the rewrite of Algor (V3) interrupts (finally
3216                    changing dev_v3 into devinit style).
3217    20070118        Removing the "bus" registry concept from machine.h, because
3218                    it was practically meaningless.
3219                    Continuing on the rewrite of Algor V3 ISA interrupts.
3220    20070121        More work on Algor interrupts; they are now working again,
3221                    well enough to run NetBSD/algor. :-)
3222    20070122        Converting VR41xx (HPCmips) interrupts. NetBSD/hpcmips
3223                    can be installed using the new interrupt system :-)
3224    20070123        Making the testmips mode work with the new interrupt system.
3225    20070127        Beginning to convert DEC5800 devices to devinit, and to the
3226                    new interrupt system.
3227                    Converting Playstation 2 devices to devinit, and converting
3228                    the interrupt system. Also fixing a severe bug: the interrupt
3229                    mask register on Playstation 2 is bitwise _toggled_ on writes.
3230    20070128        Removing the dummy NetGear machine mode and the 8250 device
3231                    (which was only used by the NetGear machine).
3232                    Beginning to convert the MacPPC GC (Grand Central) interrupt
3233                    controller to the new interrupt system.
3234                    Converting Jazz interrupts (PICA61 etc.) to the new interrupt
3235                    system. NetBSD/arc can be installed again :-)
3236                    Fixing the JAZZ timer (hardcoding it at 100 Hz, works with
3237                    NetBSD and it is better than a completely dummy timer as it
3238                    was before).
3239                    Converting dev_mp to the new interrupt system, although I
3240                    haven't had time to actually test it yet.
3241                    Completely removing src/machines/interrupts.c, cpu_interrupt
3242                    and cpu_interrupt_ack in src/cpu.c, and
3243                    src/include/machine_interrupts.h! Adding fatal error messages
3244                    + abort() in the few places that are left to fix.
3245                    Converting dev_z8530 to the new interrupt system.
3246                    FINALLY removing the md_int struct completely from the
3247                    machine struct.
3248                    SH4 fixes (adding a PADDR invalidation in the ITLB replacement
3249                    code in memory_sh.c); the NetBSD/dreamcast LiveCD now runs
3250                    all the way to the login prompt, and can be interacted with :-)
3251                    Converting the CPC700 controller (PCI and interrupt controller
3252                    for PM/PPC) to the new interrupt system.
3253    20070129        Fixing MACE ISA interrupts (SGI IP32 emulation). Both NetBSD/
3254                    sgimips' and OpenBSD/sgi's ramdisk kernels can now be
3255                    interacted with again.
3256    20070130        Moving out the MIPS multi_lw and _sw instruction combinations
3257                    so that they are auto-generated at compile time instead.
3258    20070131        Adding detection of amd64/x86_64 hosts in the configure script,
3259                    for doing initial experiments (again :-) with native code
3260                    generation.
3261                    Adding a -k command line option to set the size of the dyntrans
3262                    cache, and a -B command line option to disable native code
3263                    generation, even if GXemul was compiled with support for
3264                    native code generation for the specific host CPU architecture.
3265    20070201        Experimenting with a skeleton for native code generation.
3266                    Changing the default behaviour, so that native code generation
3267                    is now disabled by default, and has to be enabled by using
3268                    -b on the command line.
3269    20070202        Continuing the native code generation experiments.
3270                    Making PCI interrupts work for Footbridge again.
3271    20070203        More native code generation experiments.
3272                    Removing most of the native code generation experimental code,
3273                    it does not make sense to include any quick hacks like this.
3274                    Minor cleanup/removal of some more legacy MIPS interrupt code.
3275    20070204        Making i80321 interrupts work again (for NetBSD/evbarm etc.),
3276                    and fixing the timer at 100 Hz.
3277    20070206        Experimenting with removing the wdc interrupt slowness hack.
3278    20070207        Lowering the number of dyntrans TLB entries for MIPS from
3279                    192 to 128, resulting in a minor speed improvement.
3280                    Minor optimization to the code invalidation routine in
3281                    cpu_dyntrans.c.
3282    20070208        Increasing (experimentally) the nr of dyntrans instructions per
3283                    loop from 60 to 120.
3284    20070210        Commenting out (experimentally) the dyntrans_device_danger
3285                    detection in memory_rw.c.
3286                    Changing the testmips and baremips machines to use a revision 2
3287                    MIPS64 CPU by default, instead of revision 1.
3288                    Removing the dummy i960, IA64, x86, AVR32, and HP PA-RISC
3289                    files, the PC bios emulation, and the Olivetti M700 (ARC) and
3290                    db64360 emulation modes.
3291    20070211        Adding an "mp" demo to the demos directory, which tests the
3292                    SMP functionality of the testmips machine.
3293                    Fixing PReP interrupts some more. NetBSD/prep now boots again.
3294    20070216        Adding a "nop workaround" for booting Mach/PMAX to the
3295                    documentation; thanks to Artur Bujdoso for the values.
3296                    Converting more of the MacPPC interrupt stuff to the new
3297                    system.
3298                    Beginning to convert BeBox interrupts to the new system.
3299                    PPC603e should NOT have the PPC_NO_DEC flag! Removing it.
3300                    Correcting BeBox clock speed (it was set to 100 in the NetBSD
3301                    bootinfo block, but should be 33000000/4), allowing NetBSD
3302                    to start without using the (incorrect) PPC_NO_DEC hack.
3303    20070217        Implementing (slow) AltiVec vector loads and stores, allowing
3304                    NetBSD/macppc to finally boot using the GENERIC kernel :-)
3305                    Updating the documentation with install instructions for
3306                    NetBSD/macppc.
3307    20070218-19     Regression testing for the release.
3308    
3309    ==============  RELEASE 0.4.4  ==============
3310    
3311    20070224        Minor update to the initialization of the ns16550 in
3312                    machine_walnut.c, to allow that machine type to boot with the
3313                    new interrupt system (although it is still a dummy machine).
3314                    Adding a wdc at 0x14000000 to machine_landisk.c, and fixing
3315                    the SCIF serial interrupts of the SH4 cpu enough to get
3316                    NetBSD/landisk booting from a disk image :-)  Adding a
3317                    preliminary install instruction skeleton to guestoses.html.
3318    20070306        Adding SH-IPL+G PROM emulation, and also passing the "end"
3319                    symbol in r5 on bootup, for Landisk emulation. This is enough
3320                    to get OpenBSD/landisk to install :)  Adding a preliminary
3321                    install instruction skeleton to the documentation. SuperH
3322                    emulation is still shaky, though :-/
3323    20070307        Fixed a strangeness in memory_sh.c (read/write was never
3324                    returned for any page). (Unknown whether this fixes any actual
3325                    problems, though.)
3326    20070308        dev_ram.c fix: invalidate code translations on writes to
3327                    RAM, emulated as separate devices. Linux/dreamcast gets
3328                    further in the boot process than before, but still bugs out
3329                    in userland.
3330                    Fixing bugs in the "stc.l gbr,@-rN" and "ldc.l @rN+,gbr" SuperH
3331                    instructions (they should NOT check the MD bit), allowing the
3332                    Linux/dreamcast Live CD to reach userland correctly :-)
3333    20070310        Changing the cpu name "Alpha" in src/useremul.c to "21364" to
3334                    unbreak userland syscall emulation of FreeBSD/Alpha binaries.
3335    20070314        Applying a patch from Michael Yaroslavtsev which fixes the
3336                    previous Linux lib64 patch to the configure script.
3337    20070315        Adding a (dummy) sun4v machine type, and SPARC T1 cpu type.
3338    20070316        Creating a new directory, src/disk, and moving diskimage.c
3339                    to it. Separating out bootblock loading stuff from emul.c into
3340                    new files in src/disk.
3341                    Adding some more SPARC registers.
3342    20070318        Preparing/testing for a minirelease, 0.4.4.1.
3343    
3344    ==============  RELEASE 0.4.4.1  ==============
3345    
3346    20070324        Adding a "--debug" option to the configure script, to disable
3347                    optimizations in unstable development builds.
3348                    Moving out SCSI-specific stuff from diskimage.c into a new
3349                    diskimage_scsicmd.c.
3350                    Applying Håvard Eidnes' patch for SCSICDROM_READ_DISKINFO and
3351                    SCSICDROM_READ_TRACKINFO. (Not really tested yet.)
3352                    Implementing disk image "overlays" (to allow simple roll-back
3353                    to previous disk state). Adding a 'V' disk flag for this, and
3354                    updating the man page and misc.html.
3355    20070325        Stability fix to cpu_dyntrans.c, when multiple physical pages
3356                    share the same initial table entry. (The ppp == NULL check
3357                    should be physpage_ofs == 0.) Bug found by analysing GXemul
3358                    against a version patched for Godson.
3359                    Fixing a second occurance of the same problem (also in
3360                    cpu_dyntrans.c).
3361                    Fixing a MAJOR physical page leak in cpu_dyntrans.c; pages
3362                    weren't _added_ to the set of translated pages, they _replaced_
3363                    all previous pages. It's amazing that this bug has been able
3364                    to live for this long. (Triggered when emulating >128MB RAM.)
3365    20070326        Removing the GDB debugging stub support; it was too hackish
3366                    and ugly.
3367    20070328        Moving around some native code generation skeleton code.
3368    20070329        The -lm check in the configure script now also checks for sin()
3369                    in addition to sqrt(). (Thanks to Nigel Horne for noticing that
3370                    sqrt was not enough on Fedora Core 6.) (Not verified yet.)
3371    20070330        Fixing an indexing bug in dev_sh4.c, found by using gcc version
3372                    4.3.0 20070323.
3373    20070331        Some more experimentation with native code generation.
3374    20070404        Attempting to fix some more SH4 SCIF interrupt bugs; rewriting
3375                    the SH interrupt assertion/deassertion code somewhat.
3376    20070410        Splitting src/file.c into separate files in src/file/.
3377                    Cleanup: Removing the dummy TS7200, Walnut, PB1000, and
3378                    Meshcube emulation modes, and dev_epcom and dev_au1x00.
3379                    Removing the experimental CHIP8/RCA180x code; it wasn't really
3380                    working much lately, anyway. It was fun while it lasted.
3381                    Also removing the experimental Transputer CPU support.
3382    20070412        Moving the section about how the dynamic translation system
3383                    works from intro.html to a separate translation.html file.
3384                    Minor SH fixes; attempting to get OpenBSD/landisk to run
3385                    without randomly bugging out, but no success yet.
3386    20070413        SH SCI (serial bit interface) should now work together with a
3387                    (new) RS5C313 clock device (for Landisk emulation).
3388    20070414        Moving Redhat/MIPS down from supported to experimental, in
3389                    guestoses.html.
3390                    Preparing for a new release; doing some regression testing etc.
3391    
3392    ==============  RELEASE 0.4.5  ==============
3393    

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