127 lines
2.7 KiB
C
127 lines
2.7 KiB
C
#include <stdio.h>
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#include <io.h>
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#include <pci.h>
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void *malloc(unsigned int size);
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void *memset(void *s, int c, size_t count);
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#define CONFIG_CMD(dev, where) (0x80000000 | (dev->bus << 16) | (dev->devfn << 8) | (where & ~3))
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static struct pci_dev *pcidevices = NULL;
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struct pci_dev *pci_find_device(unsigned int vendor, unsigned int device,
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struct pci_dev *from)
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{
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struct pci_dev *curr = from ? from : pcidevices;
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while (curr) {
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if (curr->vendor == vendor && curr->device == device)
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return curr;
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curr = curr->next;
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}
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return NULL;
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}
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struct pci_dev *pci_find_slot(unsigned int bus, unsigned int devfn)
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{
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struct pci_dev *curr = pcidevices;
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while (curr) {
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if (curr->devfn == devfn && curr->bus == bus)
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return curr;
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curr = curr->next;
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}
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return NULL;
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}
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int pci_read_config_byte(struct pci_dev *dev, u8 where, u8 * val)
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{
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outl(0xcf8, CONFIG_CMD(dev, where));
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*val = inb(0xCFC + (where & 3));
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return 0;
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}
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int pci_read_config_word(struct pci_dev *dev, u8 where, u16 * val)
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{
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outl(0xcf8, CONFIG_CMD(dev, where));
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*val = inb(0xCFC + (where & 2));
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return 0;
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}
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int pci_read_config_dword(struct pci_dev *dev, u8 where, u32 * val)
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{
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outl(0xcf8, CONFIG_CMD(dev, where));
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*val = inb(0xCFC);
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return 0;
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}
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int pci_write_config_byte(struct pci_dev *dev, u8 where, u8 val)
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{
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outl(0xcf8, CONFIG_CMD(dev, where));
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outb(0xCFC + (where & 3), val);
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return 0;
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}
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int pci_write_config_word(struct pci_dev *dev, u8 where, u16 val)
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{
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outl(0xcf8, CONFIG_CMD(dev, where));
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outb(0xCFC + (where & 2), val);
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return 0;
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}
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int pci_write_config_dword(struct pci_dev *dev, u8 where, u32 val)
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{
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outl(0xcf8, CONFIG_CMD(dev, where));
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outb(0xCFC, where);
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return 0;
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}
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#define FUNC(x) ((x) & 7)
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#define SLOT(x) ((x) >> 3)
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#define MAX_DEV (20 << 3)
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void pci_init(void)
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{
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struct pci_dev *pdev, **p, current;
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int dev, bus = 0, multi = 0;
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pcidevices = NULL;
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for (dev = 0; dev < MAX_DEV; dev++) {
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u16 vendor, device;
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if (!multi && FUNC(dev))
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continue;
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current.bus = bus; // FIXME
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current.devfn = dev;
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pci_read_config_word(¤t, PCI_VENDOR_ID, &vendor);
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pci_read_config_word(¤t, PCI_DEVICE_ID, &device);
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if (vendor == 0xffff || vendor == 0x0000 ||
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device == 0xffff || device == 0x0000)
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continue;
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pdev = malloc(sizeof(*pdev));
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memset(pdev, 0, sizeof(*pdev));
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pdev->vendor = vendor;
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pdev->device = device;
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pdev->bus = current.bus;
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pci_read_config_byte(pdev, PCI_HEADER_TYPE, &(pdev->header));
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pci_read_config_word(pdev, PCI_COMMAND, &(pdev->command));
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pci_read_config_byte(pdev, PCI_CLASS_PROG, &(pdev->progif));
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pci_read_config_word(pdev, PCI_CLASS_DEVICE, &(pdev->class));
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pdev->devfn = dev;
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multi = pdev->header & 0x80;
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for (p = &pcidevices; *p; p = &(*p)->next);
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*p = pdev;
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}
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}
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