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kexts: pci: create generic devices for all pci devices found during scan

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This commit is contained in:
max 🍓
2023-06-10 13:23:57 +01:00
parent c5edce612d
commit 28dab53147
6 changed files with 351 additions and 133 deletions
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147
kexts/drivers/bus/pci/main.c
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@@ -1,119 +1,14 @@
#include <socks/kext.h>
#include <socks/vm.h>
#include <socks/device.h>
#include <socks/printk.h>
#include <socks/pci.h>
#include <socks/libc/stdio.h>
#include <arch/ports.h>
#include "pci.h"
static struct driver *pci_driver = NULL;
static struct bus_device *pci_bus = NULL;
static void pci_scan_bus(pci_func_t f, int type, int bus, void *arg);
void pci_write_field(uint32_t device, int field, int size, uint32_t value)
{
outportl(PCI_ADDRESS_PORT, pci_get_addr(device, field));
outportl(PCI_VALUE_PORT, value);
}
uint32_t pci_read_field(uint32_t device, int field, int size)
{
outportl(PCI_ADDRESS_PORT, pci_get_addr(device, field));
if (size == 4) {
uint32_t t = inportl(PCI_VALUE_PORT);
return t;
} else if (size == 2) {
uint16_t t = inportw(PCI_VALUE_PORT + (field & 2));
return t;
} else if (size == 1) {
uint8_t t = inportb(PCI_VALUE_PORT + (field & 3));
return t;
}
return 0xFFFF;
}
uint16_t pci_find_type(uint32_t dev)
{
return (pci_read_field(dev, PCI_CLASS, 1) << 8) | pci_read_field(dev, PCI_SUBCLASS, 1);
}
static void pci_scan_hit(pci_func_t f, uint32_t dev, void *arg)
{
int dev_vend = (int)pci_read_field(dev, PCI_VENDOR_ID, 2);
int dev_dvid = (int)pci_read_field(dev, PCI_DEVICE_ID, 2);
f(dev, dev_vend, dev_dvid, arg);
}
static void pci_scan_func(pci_func_t f, int type, int bus, int slot, int func, void *arg)
{
uint32_t dev = pci_box_device(bus, slot, func);
if (type == -1 || type == pci_find_type(dev)) {
pci_scan_hit(f, dev, arg);
}
if (pci_find_type(dev) == PCI_TYPE_BRIDGE) {
pci_scan_bus(f, type, pci_read_field(dev, PCI_SECONDARY_BUS, 1), arg);
}
}
static void pci_scan_slot(pci_func_t f, int type, int bus, int slot, void *arg)
{
uint32_t dev = pci_box_device(bus, slot, 0);
if (pci_read_field(dev, PCI_VENDOR_ID, 2) == PCI_NONE) {
return;
}
pci_scan_func(f, type, bus, slot, 0, arg);
if (!pci_read_field(dev, PCI_HEADER_TYPE, 1)) {
return;
}
for (int func = 1; func < 8; func++) {
uint32_t dev = pci_box_device(bus, slot, func);
if (pci_read_field(dev, PCI_VENDOR_ID, 2) != PCI_NONE) {
pci_scan_func(f, type, bus, slot, func, arg);
}
}
}
static void pci_scan_bus(pci_func_t f, int type, int bus, void *arg)
{
for (int slot = 0; slot < 32; ++slot) {
pci_scan_slot(f, type, bus, slot, arg);
}
}
void pci_scan(pci_func_t f, int type, void *arg)
{
if ((pci_read_field(0, PCI_HEADER_TYPE, 1) & 0x80) == 0) {
pci_scan_bus(f, type, 0, arg);
return;
}
int hit = 0;
for (int func = 0; func < 8; ++func) {
uint32_t dev = pci_box_device(0, 0, func);
if (pci_read_field(dev, PCI_VENDOR_ID, 2) == PCI_NONE) {
break;
}
hit = 1;
pci_scan_bus(f, type, func, arg);
}
if (hit) {
return;
}
for (int bus = 0; bus < 256; ++bus) {
for (int slot = 0; slot < 32; ++slot) {
pci_scan_slot(f, type, bus, slot, arg);
}
}
}
struct driver *pci_driver = NULL;
struct bus_device *pci_bus = NULL;
static void init_pci_device(uint32_t device, uint16_t vendid, uint16_t devid, void *arg)
{
@@ -123,13 +18,36 @@ static void init_pci_device(uint32_t device, uint16_t vendid, uint16_t devid, vo
pci_get_slot(device),
pci_get_func(device));
printk("pci: found device %s (vend:%04x, dev:%04x)", dev->dev_name, vendid, devid);
struct pci_device *pci_dev = kmalloc(sizeof *pci_dev, VM_NORMAL);
if (!pci_dev) {
/* TODO destroy device */
return;
}
pci_dev->pci_id.pci_vendor_id = vendid;
pci_dev->pci_id.pci_device_id = devid;
pci_dev->pci_bus = pci_get_bus(device);
pci_dev->pci_slot = pci_get_slot(device);
pci_dev->pci_func = pci_get_func(device);
dev->dev_bus_priv = pci_dev;
/* register as a generic device under the PCI driver.
if we find a suitable driver for this device, that device will re-register it as theirs. */
device_register(dev, pci_driver, bus_device_base(pci_bus));
struct pci_driver *driver = find_driver_for_pci_device(vendid, devid);
if (driver && driver->probe) {
driver->probe(driver, dev);
}
}
static kern_status_t pci_bus_scan(struct device *bus)
{
printk("pci: scanning for devices...");
pci_scan(init_pci_device, -1, NULL);
pci_enumerate_devices(init_pci_device, -1, NULL);
return KERN_OK;
}
@@ -144,6 +62,11 @@ static kern_status_t online(struct kext *self)
return KERN_NO_MEMORY;
}
kern_status_t status = init_pci_driver_cache();
if (status != KERN_OK) {
return status;
}
driver_register(pci_driver);
pci_bus = bus_device_create();
@@ -153,9 +76,11 @@ static kern_status_t online(struct kext *self)
device_register(pci_base, pci_driver, root_device());
printk("pci: subsystem initialised");
return KERN_OK;
}
DEFINE_KEXT("net.doorstuck.socks.pci",
DEFINE_KEXT(PCI_SUBSYSTEM_KEXT_ID,
online, NULL,
KEXT_NO_DEPENDENCIES);