pci.h

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/*
    This file is part of Fennix Kernel.
 
    Fennix Kernel is free software: you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation, either version 3 of
    the License, or (at your option) any later version.
 
    Fennix Kernel is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
    along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
*/
 
#ifndef __FENNIX_API_PCI_H__
#define __FENNIX_API_PCI_H__
 
#include <types.h>
 
/* https://sites.uclouvain.be/SystInfo/usr/include/linux/pci_regs.h.html */
typedef enum
{
    PCI_COMMAND_IO = 0x1,
    PCI_COMMAND_MEMORY = 0x2,
    PCI_COMMAND_MASTER = 0x4,
    PCI_COMMAND_SPECIAL = 0x8,
    PCI_COMMAND_INVALIDATE = 0x10,
    PCI_COMMAND_VGA_PALETTE = 0x20,
    PCI_COMMAND_PARITY = 0x40,
    PCI_COMMAND_WAIT = 0x80,
    PCI_COMMAND_SERR = 0x100,
    PCI_COMMAND_FAST_BACK = 0x200,
    PCI_COMMAND_INTX_DISABLE = 0x400
} PCI_COMMANDS;
 
typedef struct
{
    uint16_t VendorID;
    uint16_t DeviceID;
    uint16_t Command;
    uint16_t Status;
    uint8_t RevisionID;
    uint8_t ProgIF;
    uint8_t Subclass;
    uint8_t Class;
    uint8_t CacheLineSize;
    uint8_t LatencyTimer;
    uint8_t HeaderType;
    uint8_t BIST;
} __attribute__((packed)) PCIDeviceHeader;
 
typedef struct
{
    PCIDeviceHeader Header;
    uint32_t BAR0;
    uint32_t BAR1;
    uint32_t BAR2;
    uint32_t BAR3;
    uint32_t BAR4;
    uint32_t BAR5;
    uint32_t CardbusCISPointer;
    uint16_t SubsystemVendorID;
    uint16_t SubsystemID;
    uint32_t ExpansionROMBaseAddress;
    uint8_t CapabilitiesPointer;
    uint8_t Reserved0;
    uint16_t Reserved1;
    uint32_t Reserved2;
    uint8_t InterruptLine;
    uint8_t InterruptPin;
    uint8_t MinGrant;
    uint8_t MaxLatency;
} __attribute__((packed)) PCIHeader0;
 
typedef struct
{
    PCIDeviceHeader Header;
    uint32_t BAR0;
    uint32_t BAR1;
    uint8_t PrimaryBusNumber;
    uint8_t SecondaryBusNumber;
    uint8_t SubordinateBusNumber;
    uint8_t SecondaryLatencyTimer;
    uint8_t IOBase;
    uint8_t IOLimit;
    uint16_t SecondaryStatus;
    uint16_t MemoryBase;
    uint16_t MemoryLimit;
    uint16_t PrefetchableMemoryBase;
    uint16_t PrefetchableMemoryLimit;
    uint32_t PrefetchableMemoryBaseUpper32;
    uint32_t PrefetchableMemoryLimitUpper32;
    uint16_t IOBaseUpper16;
    uint16_t IOLimitUpper16;
    uint8_t CapabilitiesPointer;
    uint8_t Reserved0;
    uint16_t Reserved1;
    uint32_t ExpansionROMBaseAddress;
    uint8_t InterruptLine;
    uint8_t InterruptPin;
    uint16_t BridgeControl;
} __attribute__((packed)) PCIHeader1;
 
typedef struct
{
    PCIDeviceHeader Header;
    uint32_t CardbusSocketRegistersBaseAddress;
    uint8_t CapabilitiesPointer;
    uint8_t Reserved0;
    uint16_t SecondaryStatus;
    uint8_t PCIbusNumber;
    uint8_t CardbusBusNumber;
    uint8_t SubordinateBusNumber;
    uint8_t CardbusLatencyTimer;
    uint32_t MemoryBase0;
    uint32_t MemoryLimit0;
    uint32_t MemoryBase1;
    uint32_t MemoryLimit1;
    uint32_t IOBase0;
    uint32_t IOLimit0;
    uint32_t IOBase1;
    uint32_t IOLimit1;
    uint8_t InterruptLine;
    uint8_t InterruptPin;
    uint16_t BridgeControl;
    uint16_t SubsystemVendorID;
    uint16_t SubsystemID;
    uint32_t LegacyBaseAddress;
} __attribute__((packed)) PCIHeader2;
 
typedef struct
{
    uint64_t BaseAddress;
    uint16_t PCISegGroup;
    uint8_t StartBus;
    uint8_t EndBus;
    uint32_t Reserved;
} __attribute__((packed)) DeviceConfig;
 
typedef struct
{
    PCIDeviceHeader *Header;
    DeviceConfig *Config;
    uint32_t Bus;
    uint32_t Device;
    uint32_t Function;
} __attribute__((packed)) PCIDevice;
 
typedef struct
{
    PCIDevice *Device;
    /* PCIArray */ void *Next;
} __attribute__((packed)) PCIArray;
 
#ifdef __cplusplus
extern "C"
{
#endif
 
    PCIArray *GetPCIDevices(uint16_t Vendors[], uint16_t Devices[]);
    void InitializePCI(PCIDevice *Device);
    uint32_t GetBAR(uint8_t Index, PCIDevice *Device);
    uint8_t iLine(PCIDevice *Device);
    uint8_t iPin(PCIDevice *Device);
 
#ifdef __cplusplus
}
#endif
 
#endif // !__FENNIX_API_PCI_H__