PCI: Difference between revisions
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m int 0x1a PCI BIOS presence check, fix function selection to use AX instead of BX |
m Identify the actual in & out function used in the code examples |
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¹ Register Offset has to point to consecutive DWORDs, ie. bits 1:0 are always 0b00 (they are still part of the Register Offset). |
¹ Register Offset has to point to consecutive DWORDs, ie. bits 1:0 are always 0b00 (they are still part of the Register Offset). |
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The following code segment illustrates the use of configuration mechanism #1 to read 16-bit fields from configuration space. Note that this segment, the |
The following code segment illustrates the use of configuration mechanism #1 to read 16-bit fields from configuration space. Note that this segment, the outl(port, value) and inl(port) functions refer to the OUTL and INL Pentium assembly language instructions. |
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<source lang="c"> |
<source lang="c"> |
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uint16_t pciConfigReadWord (uint8_t bus, uint8_t slot, uint8_t func, uint8_t offset) { |
uint16_t pciConfigReadWord (uint8_t bus, uint8_t slot, uint8_t func, uint8_t offset) { |
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