How to write a program in C language under DOS to control PCI read and write? - China DOS Union Forum

PCI BIOS can be used. The interrupt number of PCI BIOS is 1Ah, where AH is B1 and AL is the function number. Its function list is:

01h: INSTALLATION CHECK
02h: FIND PCI DEVICE
03h: FIND PCI CLASS CODE
06h: PCI BUS-SPECIFIC OPERATIONS
08h: READ CONFIGURATION BYTE
09h: READ CONFIGURATION WORD
0Ah: READ CONFIGURATION DWORD
0Bh: WRITE CONFIGURATION BYTE
0Ch: WRITE CONFIGURATION WORD
0Dh: WRITE CONFIGURATION DWORD
0Eh: GET IRQ ROUTING INFORMATION
0Fh: SET PCI IRQ
81h: INSTALLATION CHECK (32-bit)
82h: FIND PCI DEVICE (32-bit)
83h: FIND PCI CLASS CODE (32-bit)
86h: PCI BUS-SPECIFIC OPERATIONS (32-bit)
88h: READ CONFIGURATION BYTE (32-bit)
89h: READ CONFIGURATION WORD (32-bit)
8Ah: READ CONFIGURATION DWORD (32-bit)
8Bh: WRITE CONFIGURATION BYTE (32-bit)
8Ch: WRITE CONFIGURATION WORD (32-bit)
8Dh: WRITE CONFIGURATION DWORD (32-bit)
8Eh: GET IRQ ROUTING INFORMATION (32-bit)
8Fh: SET PCI IRQ (32-bit)
In addition, it can also be implemented by accessing ports CF8h and CFCh

Floor1　jirow	Posted 2006-10-13 01:49
新手上路　Posts 1　Credits 4
How to write a program in C language under DOS to control PCI reading and writing? I hope all experts can give a reference program, thank you!

Floor2　howardxuhh	Posted 2006-11-09 02:36
新手上路　Posts 3　Credits 10　From zj
All are operated through address mapping. The original ISA bus all operate in an address-data manner. PCI is similar, mapping the base address of the PCI device to the 1M memory range (the memory area accessible by the C compiler). By reading and writing the base address and its offset, the internal resources of the PCI device can be accessed.

Floor3　dsysps	Posted 2006-11-09 22:11
初级用户　Posts 34　Credits 98
PCI BIOS can be used. The interrupt number of PCI BIOS is 1Ah, where AH is B1 and AL is the function number. Its function list is: 01h: INSTALLATION CHECK 02h: FIND PCI DEVICE 03h: FIND PCI CLASS CODE 06h: PCI BUS-SPECIFIC OPERATIONS 08h: READ CONFIGURATION BYTE 09h: READ CONFIGURATION WORD 0Ah: READ CONFIGURATION DWORD 0Bh: WRITE CONFIGURATION BYTE 0Ch: WRITE CONFIGURATION WORD 0Dh: WRITE CONFIGURATION DWORD 0Eh: GET IRQ ROUTING INFORMATION 0Fh: SET PCI IRQ 81h: INSTALLATION CHECK (32-bit) 82h: FIND PCI DEVICE (32-bit) 83h: FIND PCI CLASS CODE (32-bit) 86h: PCI BUS-SPECIFIC OPERATIONS (32-bit) 88h: READ CONFIGURATION BYTE (32-bit) 89h: READ CONFIGURATION WORD (32-bit) 8Ah: READ CONFIGURATION DWORD (32-bit) 8Bh: WRITE CONFIGURATION BYTE (32-bit) 8Ch: WRITE CONFIGURATION WORD (32-bit) 8Dh: WRITE CONFIGURATION DWORD (32-bit) 8Eh: GET IRQ ROUTING INFORMATION (32-bit) 8Fh: SET PCI IRQ (32-bit) In addition, it can also be implemented by accessing ports CF8h and CFCh