Date: Mon, 28 Jul 1997 15:24:16 -0800 From: Jake Hamby <jehamby@be.com> To: Michael Smith <msmith@atrad.adelaide.edu.au> Cc: <hackers@freebsd.org> Subject: Re: Anyone tried VirtualPC with FreeBSD? Message-ID: <19970728152416.PM-jriro5pm@Adam.BeOS>
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Michael Smith wrote: >Jake Hamby stands accused of saying: >> Just for fun, I tried to boot FreeBSD 2.2.2 from within the VirtualPC >> emulator for MacOS, which claims to simulate a full Intel Pentium PC at >> the hardware level. It can run unmodified version of Windows 95, NT, >> OS/2, and NextStep, and so I assumed it wouldn't have much trouble with >> FreeBSD. >> >> Unfortunately, immediately after loading the kernel, FreeBSD panicked with >> this error: >> >> Fatal trap 1: privileged instruction fault while in kernel mode >> >> instruction ptr = 0x8:0xf01b99aa > >Where is this in the kernel? Are you booting an installation disk? If >so, which one? Suck the kernel off the disk, and say : > >nm kernel | sort | less > >and send us the symbols from around the IP above. I'm using the BOOTMFS kernel from the FreeBSD 2.2.2 RELEASE. Here are the symbols near the area of the crash: f01b93cc t _clkintr f01b9598 T _acquire_timer0 f01b95fc T _acquire_timer2 f01b9624 T _release_timer0 f01b9660 T _release_timer2 f01b9684 t _rtcintr f01b96a8 t _getit f01b96d4 T _DELAY f01b9794 t _sysbeepstop f01b97b0 T _sysbeep f01b985c T _rtcin f01b98e4 t _calibrate_clocks f01b9a90 t _set_timer_freq f01b9bb4 T _startrtclock f01b9d3c T _inittodr f01b9ef0 T _resettodr f01ba0e4 T _cpu_initclocks f01ba1e8 T _setstatclockrate f01ba218 t _sysctl_machdep_i8254_freq f01ba284 t _sysctl___machdep_i8254_freq f01ba2b0 t ___set_sysctl__machdep_sym_sysctl___machdep_i8254_freq f01ba2b4 t _set_i586_ctr_freq f01ba338 t _sysctl_machdep_i586_freq f01ba398 t _sysctl___machdep_i586_freq f01ba3c0 t ___set_sysctl__machdep_sym_sysctl___machdep_i586_freq >> Obviously, this is a bug in Connectix's CPU emulator. But I'm curious if >> anyone could give any information off-hand as to what they might be doing >> wrong that would trigger such an error from the FreeBSD kernel. > >Not _necessarily_ "obviously"; it's possible that the emulator just does >something "odd" that's upsetting the kernel. Yep. It actually would be better if it *was* a bug in FreeBSD because we're much more likely to fix it than they are, since FreeBSD isn't on their list of "supported" OS's. BTW, here's some further info on the hardware that Virtual PC simulates (from the manual). It's important to keep in mind that this is an all-software emulator: despite the detailed chipset listing, there is no actual PC hardware involved! Intel Pentium with MMX Includes complete support for Pentium architecture including protected-mode, MMU, FPU, and MMX. Virtual PC uses the Intel Triton chipset (Intel Zappa motherboard). It includes all auxiliary chips needed for a PC including: 8259 PIC 8254 PIT 8237 DMA controller CMOS RTC BIOS is the Microid Reserach System BIOS Hard drive image and CD-ROM accessed through dual IDE/ATAPI controllers 8255 keyboard controller Emulates a PS/2 mouse using IRQ 12 SoundBlaster Pro card on port 0x220, IRQ 5, and DMA channel 1 DEC 21041-based PCI Ethernet card, Plug and Play but on IRQ 11 by default -jake
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