APIC IRQ detection?
Posted on 2020-10-29, 21:36
I can't find anything anywhere about it. How are IRQs detected on a APIC(e.g. Linux and Windows)?
Re: i430fx motherboard emulation issues?
Posted on 2020-10-29, 13:27
Just noticed that both Bochs and UniPCemu has its errors with the I/O APIC window register. Bochs doesn't mask it at all(full 32-bits), while masking the address for the window/address register to 8-bits. While actually, the address register should be 32-bits wide (and writable) with only 8-bits …
Re: i430fx motherboard emulation issues?
Posted on 2020-10-28, 18:48
Just implemented the APIC ID (both logical(not the IO APIC) and physical) and it's handling of the various types(3-bit value in the request). The NMI is now also handled, as is the lowest priority(currently aliases to the normal interupt vector method). Only SMI, SIPI and extInt isn't implemented …
Re: i430fx motherboard emulation issues?
Posted on 2020-10-28, 12:33
For now, I've added a shadow register IRR for the APIC, which is cleared when the APIC is disabled or enabled. Said shadow register is set when a IR is masked and it's raised(in edge mode). It's sent to the IRR for starting the IRQ when the IRQ is unmasked(clearing said shadow register bit as well). …
Re: i430fx motherboard emulation issues?
Posted on 2020-10-28, 10:11
OK. How are IRQs detected on a APIC? For e.g. IRR 0 etc? Are IRQs kept pending when masked in the I/O APIC? So are they send when raised while masked and unmasked afterwards? Or does the mask ignore any monitoring of the IR lines? Edit: Bochs seems to imply that IRR is set pending until unmasked, …
Re: i430fx motherboard emulation issues?
Posted on 2020-10-27, 20:27
Does Windows NT require the APIC high precision timer to be functional to boot? Edit: Just tried Debian Jessie(8.11.1). It seems to enable most IRQs on the APIC. But it asks to press enter or space for selecting a video mode(mode 314 isn't supported on the ET4000AX?). But it can't receive it, since …
Re: i430fx motherboard emulation issues?
Posted on 2020-10-27, 02:18
Just implemented a 8-bit version of the 86box's Intel flash ROM. That seems to at least fix the ESCD updating. :D Edit: Added to that most of the MultiProcessor specification(although with only 1 processor installed). The only thing that isn't compatible yet is the NMI, which is still routed in it's …
Re: i430fx motherboard emulation issues?
Posted on 2020-10-26, 21:51
Weirdly enough, Windows NT 4.0 only seems to enable the IRQ8 handler on the APIC? There are various other IRQ handlers that actually try to fire, but are masked off? Bit 16 of all other IRQ registers on the I/O APIC is set? So it's masking all other IRQs off for some weird reason? All that weird …
Re: i430fx motherboard emulation issues?
Posted on 2020-10-26, 04:46
After implementing the APIC registers and it's read-only registers(the LAPIC writable registers being fully writable atm), Windows NT 4.0 tries to disable the PIC(setting the mask registers to 0xFF) and use the APIC/LAPIC instead. But since the APIC doesn't have anything emulated yet, it will hang …
Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?
Posted on 2020-10-24, 19:59
Just tried the Windows NT 4 workstation CD-ROM booting 0n the i440fx emulation. Somehow, it boots, while failing on the i430fx BIOS?
Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?
Posted on 2020-10-24, 12:45
Hmmm... Tried booting Windows 2000 CD-ROM on the new i440fx motherboard emulation. It actually starts loading the files! The floppy disk version hanged before it could start loading said files (directly after the RAID/non-something devices press F6 query). Edit: It gets to the "Setup is starting …
Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?
Posted on 2020-10-24, 01:28
OK. I've managed to get some information about the page fault causing the NT 4.0 crash eventually(the last page fault that happens before the CPU reset happens, to Linear Addresss C15C0000): CR4=91h PDE=43163h. PTE=472C34h It's a write at kernel privilege. The error code pushed is 0002h. The …
Re: i430fx motherboard emulation issues?
Posted on 2020-10-23, 20:12
I now seem to have some kind of issue with the loading/setting of the Intel 8254 PIT? It doesn't seem to like the values it's returning after writing them for some reason? First it writes FF, latches it(which might have been decreased by a PIT clock), compares it with FF, then it will either error …
Re: i430fx motherboard emulation issues?
Posted on 2020-10-23, 16:03
After fixing some more issues(mainly CPU speed issues, where the CPU was too slow, being unable to keep the PIT counter the same during a write-latch test, causing the BIOS to hang itself up because it's thinking that the PIT isn't working properly), it seems to manage to POST some futher. Now I see …
ATA/ATAPI drive/head register behaviour during drive select?
Posted on 2020-10-14, 07:03
Is the destination drive drive/head register when the drive bit in the register is changed? So will switching from drive 0 to 1 or vise versa update the other bits in said register? Or will they stay unchanged? Edit: Just now made it match Bochs behaviouir: writing either master or slave drive/head …
Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?
Posted on 2020-10-13, 23:05
Just throught I'd try Windows 2000 to compare with NT 4.0 Workstation. It seems to be in protected mode with paging enabled and executing some small loop at linear address 321A8E infinitely (it keeps jumping back from 008:00321AA6)? That happens directly after the press F6 prompt for installing a …
Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?
Posted on 2020-10-13, 20:32
It seems to be searching for a needle in a haystack. Perhaps I should do a reverse search: start at the bottom, tracing parent routine ('s parent routine etc.) execution until I hit something interesting? So far backtraced to 0008:80011902. Then 0008:800118fd. I find 0008:800118e7, which may be a …
Re: Any good MS-DOS/Windows 9x(up to 98FE)/NT 3.1 80386-Pentium (/Pro/II)(no FPU) games for testing IA-32 emulation?
Posted on 2020-10-12, 17:11
The last thing I see it do before triggering the reset in the log, is execute a C5 write multiple command to the hard disk? The parameters are as follows(it's a 504MB HDD): 1F2=08h(thus a 4KB block being accessed) 1F3=30h 1F4=FFh 1F5=01h 1F6=A0h 1F7=C5h(write multiple). That's found out by searching …
Re: i430fx motherboard emulation issues?
Posted on 2020-10-11, 22:23
Just tried the BIOS ROM for the 86box's "[i440FX] ASUS P/I-P65UP5 (C-P6ND)" machine(just the nd6i0218.awd ROM). It seems to start up partially, displays the processor and then hangs itself(using a jmp to it's own address). This might be a good starting point? How much of it's chipset is mandatory to …
Re: i430fx motherboard emulation issues?
Posted on 2020-10-11, 17:29
After this bugfix, it seems that it works properly(according to the port 402h log), but the display ROM isn't found(probably because it isn't injected into the ROM?): 00:05:20:26.00096: SeaBIOS (version rel-1.7.5-0-ge51488c-20140528_081134-morn.localdomain) 00:05:20:27.09072: No Xen hypervisor found …
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