device.hh

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/* @file
 * Interface for devices using PCI configuration
 */

#ifndef __DEV_PCI_DEVICE_HH__
#define __DEV_PCI_DEVICE_HH__

#include <cstring>
#include <vector>

#include "dev/dma_device.hh"
#include "dev/pci/host.hh"
#include "dev/pci/pcireg.h"
#include "params/PciDevice.hh"
#include "sim/byteswap.hh"

#define BAR_IO_MASK 0x3
#define BAR_MEM_MASK 0xF
#define BAR_IO_SPACE_BIT 0x1
#define BAR_IO_SPACE(x) ((x) & BAR_IO_SPACE_BIT)
#define BAR_NUMBER(x) (((x) - PCI0_BASE_ADDR0) >> 0x2);

class PciDevice : public DmaDevice
{
  protected:
    const PciBusAddr _busAddr;

    PCIConfig config;

    const int PMCAP_BASE;
    const int PMCAP_ID_OFFSET;
    const int PMCAP_PC_OFFSET;
    const int PMCAP_PMCS_OFFSET;
    PMCAP pmcap;

    const int MSICAP_BASE;
    MSICAP msicap;

    const int MSIXCAP_BASE;
    const int MSIXCAP_ID_OFFSET;
    const int MSIXCAP_MXC_OFFSET;
    const int MSIXCAP_MTAB_OFFSET;
    const int MSIXCAP_MPBA_OFFSET;
    int MSIX_TABLE_OFFSET;
    int MSIX_TABLE_END;
    int MSIX_PBA_OFFSET;
    int MSIX_PBA_END;
    MSIXCAP msixcap;

    const int PXCAP_BASE;
    PXCAP pxcap;
    std::vector<MSIXTable> msix_table;
    std::vector<MSIXPbaEntry> msix_pba;

    uint32_t BARSize[6];

    Addr BARAddrs[6];

    bool legacyIO[6];

    bool
    isLargeBAR(int bar) const
    {
        return bits(config.baseAddr[bar], 2, 1) == 0x2;
    }

    bool
    isBAR(Addr addr, int bar) const
    {
        assert(bar >= 0 && bar < 6);
        return BARAddrs[bar] <= addr && addr < BARAddrs[bar] + BARSize[bar];
    }

    int
    getBAR(Addr addr)
    {
        for (int i = 0; i <= 5; ++i)
            if (isBAR(addr, i))
                return i;

        return -1;
    }

    bool
    getBAR(Addr addr, int &bar, Addr &offs)
    {
        int b = getBAR(addr);
        if (b < 0)
            return false;

        offs = addr - BARAddrs[b];
        bar = b;
        return true;
    }

  public: // Host configuration interface
    virtual Tick writeConfig(PacketPtr pkt);


    virtual Tick readConfig(PacketPtr pkt);

  protected:
    PciHost::DeviceInterface hostInterface;

    Tick pioDelay;
    Tick configDelay;

  public:
    Addr pciToDma(Addr pci_addr) const {
        return hostInterface.dmaAddr(pci_addr);
    }

    void intrPost() { hostInterface.postInt(); }
    void intrClear() { hostInterface.clearInt(); }

    uint8_t interruptLine() const { return letoh(config.interruptLine); }

    AddrRangeList getAddrRanges() const override;

    PciDevice(const PciDeviceParams *params);

    void serialize(CheckpointOut &cp) const override;

    void unserialize(CheckpointIn &cp) override;

    const PciBusAddr &busAddr() const { return _busAddr; }
};
#endif // __DEV_PCI_DEVICE_HH__