ecam.c

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#include <core/system.h>
#include <dev/pci.h>
#include <cpu/io.h>

static uintptr_t offset(struct pci_dev *dev, uint16_t reg)
{
    return (uintptr_t) dev->bus << 20 | (uintptr_t) dev->dev << 15 |
           (uintptr_t) dev->func << 12 | (reg & 0xFFC);
}

uint32_t pci_ecam_read(struct pci_host *host, struct pci_dev *dev, uint16_t reg)
{
    uintptr_t off = offset(dev, reg);
 
    if (off >= host->size)
        return 0xFFFFFFFF;
 
    return io_in32(&host->config, off);
}

void pci_ecam_write(struct pci_host *host, struct pci_dev *dev, uint16_t reg, uint32_t val)
{
    uintptr_t off = offset(dev, reg);
 
    if (off < host->size)
        io_out32(&host->config, off, val);
}