58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
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#pragma once
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#include <stdint.h>
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#include "io.h"
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// Configuration Space Access Mechanism #1
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#define CONFIG_ADDRESS 0xCF8 // Configuration adress that is to be accessed
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#define CONFIG_DATA 0xCFC // Will do the actual configuration operation
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/*
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CONFIG_ADDRESS
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32 bit register
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bit 31 Enable bit (Should CONFIG_DATA be translatedc to configuration cycles)
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bit 30 - 24 Reserved
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bit 23 - 16 Bus Number (Choose a specific PCI BUS)
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bit 15 - 11 Device Number (Selects specific device one the pci bus)
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bit 10 - 8 Function Number (Selects a specific function in a device)
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bit 7 - 0 Register Offset (Offset in the configuration space of 256 Bytes ) NOTE: lowest two bits will always be zero
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*/
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/*
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PCI Device structure
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Register offset bits 31-24 bits 23-16 bits 15-8 bits 7-0
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00 00 Device ID <---- Vendor ID <-------
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01 04 Status <---- Command <-------
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02 08 Class code Sub class Prog IF Revision ID
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03 0C BIST Header Type Ltncy Timer Cache line Size
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04 10 Base address #0 (BAR0)
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05 14 Base address #1 (BAR1)
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06 18 Base address #2 (BAR2)
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07 1C Base address #3 (BAR3)
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08 20 Base address #4 (BAR4)
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09 24 Base address #5 (BAR5)
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0A 28 Cardbus CIS Pointer
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0B 2C Subsystem ID <------ Subsystem Vendor ID <-------
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0C 30 Expansion ROM base address
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0D 34 Reserved <------- Capabilities Pointer <------
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0E 38 Reserved <------- <-------- <--------
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0F 3C Max ltncy Min Grant Interrupt PIN Interrupt Line
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*/
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/*
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The idea for now is to support the minimal things necessary to find ATA supported drives
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*/
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// Lets write some boiler plate configuration code
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uint16_t ConfigReadWord (uint8_t bus, uint8_t slot, uint8_t func, uint8_t offset);
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uint16_t CheckVendor (uint8_t bus, uint8_t slot);
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void checkDevice (uint8_t bus, uint8_t device );
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