XP: PCI slot number identification
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From: Sergey Alekseev on 19 Jan 2007 12:59 Dear Sirs, I have the following question. I have two equal PCI cards. How can I get the information about numbers of PCI slots, in which these cards are switched in, using only driver facilities? Best regards, Sergey Alekseev
From: soviet_bloke on 20 Jan 2007 06:08 How can I get the > information about numbers of PCI slots, in which these cards are switched > in, using only driver facilities? In x86 world, the whole thing can be done simply by reading configuration space (i.e. 4-byte write and read from IO ports respectively CF8h and CFCh). Bit 31 of the value you write to port FC8h is always 1, and bits 30-24 are always 0. Theoretically you may have up to 256 buses, so that bits 23-16 of the value you write to port CF8h indicate bus number, which, unless you target a card that is inserted into PCI slot, should be 0. Bits 15-11 indicate a device, and and bit 10-8 indicate a function number (if device is present, it has to support at least one function). The remaining bits indicate read offset, which for the purpose of your task, should be 0 (by reading 4 bytes from the offset 0, you get 2-byte vendor ID register and 2-byte device ID register) I hope now you already understand how to enumerate buses, devices and functions - you write to port CF8h, and then read data from port CFCh. Unless the value that you have read from port CFCh happens to be 0xFFFFFFFF, you can be 100% sure that a given device on a given bus exists, so that the 4-byte value you have read from port CFCh is vendor ID (bits 0-15) and device ID (bits 16-31). Therefore, you can enumerate all devices on all buses from 1 to 255, get their vendor and device IDs, detect your target cards, discover on which buses they are, and, as a result, get an answer to your original question..... Anton Bassov Sergey Alekseev wrote: > Dear Sirs, > > I have the following question. I have two equal PCI cards. How can I get the > information about numbers of PCI slots, in which these cards are switched > in, using only driver facilities? > > Best regards, > > Sergey Alekseev
From: Maxim S. Shatskih on 20 Jan 2007 09:46 > I hope now you already understand how to enumerate buses, devices and > functions - you write to port CF8h, and then read data from port CFCh. No ways of doing this safely under Windows - ports 0xcf8/0xcfc belong to PCI.SYS (or the HAL) and you cannot grab the lock which guards them. -- Maxim Shatskih, Windows DDK MVP StorageCraft Corporation maxim(a)storagecraft.com http://www.storagecraft.com
From: soviet_bloke on 20 Jan 2007 13:30 > No ways of doing this safely under Windows - ports 0xcf8/0xcfc belong to > PCI.SYS (or the HAL) and you cannot grab the lock which guards them. If this is the case, how can bus adapter or controller enumerate devices that are currently present on its bus, apart from submitting a request to PCI and providing bus number with it ??? Anton Bassov Maxim S. Shatskih wrote: > > I hope now you already understand how to enumerate buses, devices and > > functions - you write to port CF8h, and then read data from port CFCh. > > No ways of doing this safely under Windows - ports 0xcf8/0xcfc belong to > PCI.SYS (or the HAL) and you cannot grab the lock which guards them. > > -- > Maxim Shatskih, Windows DDK MVP > StorageCraft Corporation > maxim(a)storagecraft.com > http://www.storagecraft.com
From: Don Burn on 20 Jan 2007 13:42
Well a bus adapter is typically a device unto itself. If they really need this data they can use the various user space SetupAPI, but touching the CF8/CFC ports will cause crashes. -- Don Burn (MVP, Windows DDK) Windows 2k/XP/2k3 Filesystem and Driver Consulting http://www.windrvr.com Remove StopSpam from the email to reply <soviet_bloke(a)hotmail.com> wrote in message news:1169317825.566165.241250(a)a75g2000cwd.googlegroups.com... >> No ways of doing this safely under Windows - ports 0xcf8/0xcfc belong to >> PCI.SYS (or the HAL) and you cannot grab the lock which guards them. > > > If this is the case, how can bus adapter or controller enumerate > devices that are currently present on its bus, apart from submitting a > request to PCI and providing bus number with it ??? > > Anton Bassov > > > Maxim S. Shatskih wrote: >> > I hope now you already understand how to enumerate buses, devices and >> > functions - you write to port CF8h, and then read data from port CFCh. >> >> No ways of doing this safely under Windows - ports 0xcf8/0xcfc belong to >> PCI.SYS (or the HAL) and you cannot grab the lock which guards them. >> >> -- >> Maxim Shatskih, Windows DDK MVP >> StorageCraft Corporation >> maxim(a)storagecraft.com >> http://www.storagecraft.com > |