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#include <comus/drivers/pci.h>
#include <comus/asm.h>
#include <lib.h>
#define CONF_ADDR 0xCF8
#define CONF_DATA 0xCFC
#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;
};
static struct pci_table_entry pci_table[TABLE_LEN];
static size_t pci_table_next = 0;
uint32_t pci_rcfg_d(struct pci_device dev, uint8_t offset)
{
uint32_t addr = 0x80000000;
addr |= ((uint32_t)dev.bus) << 16;
addr |= ((uint32_t)dev.device) << 11;
addr |= ((uint32_t)dev.function) << 8;
addr |= offset & 0xFC;
outl(CONF_ADDR, addr);
uint32_t in = inl(CONF_DATA);
return in;
}
static void print_device(struct pci_table_entry *entry)
{
printf(
"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;
}
uint16_t pci_rcfg_w(struct pci_device dev, uint8_t offset)
{
uint32_t dword = pci_rcfg_d(dev, offset);
return (uint16_t)((dword >> ((offset & 2) * 8)) & 0xFFFF);
}
uint8_t pci_rcfg_b(struct pci_device dev, uint8_t offset)
{
uint32_t dword = pci_rcfg_d(dev, offset);
return (uint8_t)((dword >> ((offset & 3) * 8)) & 0xFF);
}
void pci_wcfg_d(struct pci_device dev, uint8_t offset, uint32_t dword)
{
uint32_t addr = 0x80000000;
addr |= ((uint32_t)dev.bus) << 16;
addr |= ((uint32_t)dev.device) << 11;
addr |= ((uint32_t)dev.function) << 8;
addr |= offset & 0xFC;
outl(CONF_ADDR, addr);
outl(CONF_DATA, dword);
}
void pci_wcfg_w(struct pci_device dev, uint8_t offset, uint16_t word)
{
size_t shift = (offset & 2) * 8;
uint32_t dword = pci_rcfg_d(dev, offset);
dword &= ~(0xFFFF << shift);
dword |= word << shift;
pci_wcfg_d(dev, offset, dword);
}
void pci_wcfg_b(struct pci_device dev, uint8_t offset, uint8_t byte)
{
size_t shift = (offset & 3) * 8;
uint32_t dword = pci_rcfg_d(dev, offset);
dword &= ~(0xFF << shift);
dword |= byte << shift;
pci_wcfg_d(dev, offset, dword);
}
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);
}
}
}
printf("PCI DEVICES\n");
for (size_t i = 0; i < pci_table_next; i++) {
print_device(&pci_table[i]);
print_device(&pci_table[i]);
print_device(&pci_table[i]);
}
printf("\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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