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#include <pci.h>
#include <lib.h>
#include <panic.h>
#define PCI_INTERNAL
#include <sys/pci.h>
#define TABLE_LEN 16
struct pci_table_entry {
struct pci_device device;
uint16_t device_id;
uint16_t vendor_id;
uint8_t class;
uint8_t subclass;
uint8_t prog_if;
uint8_t revision;
};
uint32_t pci_rcfg_d(struct pci_device dev, uint8_t offset) {
return pci_sys_rcfg_d(dev, offset);
}
uint16_t pci_rcfg_w(struct pci_device dev, uint8_t offset) {
return pci_sys_rcfg_w(dev, offset);
}
uint8_t pci_rcfg_b(struct pci_device dev, uint8_t offset) {
return pci_sys_rcfg_b(dev, offset);
}
void pci_wcfg_d(struct pci_device dev, uint8_t offset, uint32_t dword) {
pci_sys_wcfg_d(dev, offset, dword);
}
void pci_wcfg_w(struct pci_device dev, uint8_t offset, uint16_t word) {
pci_sys_wcfg_w(dev, offset, word);
}
void pci_wcfg_b(struct pci_device dev, uint8_t offset, uint8_t byte) {
pci_sys_wcfg_b(dev, offset, byte);
}
static struct pci_table_entry pci_table[TABLE_LEN];
static size_t pci_table_next = 0;
static void print_device(struct pci_table_entry *entry) {
kprintf(
"BUS: %#-4x DEV: %#-4x FUNC: %#-4x ID: %04x:%04x CLASS: %02x:%02x:%02x REV: %#02x\n",
entry->device.bus,
entry->device.device,
entry->device.function,
entry->vendor_id,
entry->device_id,
entry->class,
entry->subclass,
entry->prog_if,
entry->revision
);
}
static struct pci_table_entry *load_device(struct pci_device dev) {
if (pci_table_next >= TABLE_LEN) panic("Too many PCI devices: limit is %d", TABLE_LEN);
struct pci_table_entry *entry = &pci_table[pci_table_next++];
entry->device = dev;
uint32_t dword0 = pci_rcfg_d(dev, 0);
uint32_t dword2 = pci_rcfg_d(dev, 8);
entry->device_id = (dword0 >> 16) & 0xFFFF;
entry->vendor_id = dword0 & 0xFFFF;
entry->class = (dword2 >> 24) & 0xFF;
entry->subclass = (dword2 >> 16) & 0xFF;
entry->prog_if = (dword2 >> 8) & 0xFF;
entry->revision = dword2 & 0xFF;
return entry;
}
void pci_init(void) {
pci_table_next = 0;
struct pci_device pcidev;
for (int bus = 0; bus < 256; bus++) {
pcidev.bus = bus;
for (int dev = 0; dev < 32; dev++) {
pcidev.device = dev;
pcidev.function = 0;
uint16_t vendor = pci_rcfg_w(pcidev, 0);
if (vendor == 0xFFFF) continue;
load_device(pcidev);
uint8_t header_type = pci_rcfg_b(pcidev, 14);
if (!(header_type & 0x80)) continue;
for (int func = 1; func < 8; func++) {
pcidev.function = func;
uint16_t vendor = pci_rcfg_w(pcidev, 0);
if (vendor == 0xFFFF) continue;
load_device(pcidev);
}
}
}
kprintf("PCI DEVICES\n");
for (size_t i = 0; i < pci_table_next; i++) {
print_device(&pci_table[i]);
}
kprintf("\n");
}
bool pci_findby_class(struct pci_device *dest, uint8_t class, uint8_t subclass, size_t *offset) {
size_t o = 0;
if (offset == NULL) offset = &o;
for (; *offset < pci_table_next; (*offset)++) {
struct pci_table_entry *entry = &pci_table[*offset];
if (entry->class == class && entry->subclass == subclass) {
*dest = entry->device;
return true;
}
}
return false;
}
bool pci_findby_id(struct pci_device *dest, uint16_t device, uint16_t vendor, size_t *offset) {
size_t o = 0;
if (offset == NULL) offset = &o;
for (; *offset < pci_table_next; (*offset)++) {
struct pci_table_entry *entry = &pci_table[*offset];
if (entry->device_id == device && entry->vendor_id == vendor) {
*dest = entry->device;
return true;
}
}
return false;
}
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