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kexts: pci: implement device enumeration

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max 🍓
2023-06-09 21:26:04 +01:00
parent 9bea0a8081
commit 4a2c5de5b6
3 changed files with 243 additions and 0 deletions
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8
kexts/drivers/bus/pci/extension.yaml Normal file
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name: acpi
description: |
PCI bus driver.
id: net.doorstuck.socks.pci
license: BSD-3-Clause
copyright: Copyright © Max Wash 2023
sources:
- main.c

74
kexts/drivers/bus/pci/include/socks/pci.h Normal file
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#ifndef SOCKS_PCI_H_
#define SOCKS_PCI_H_
#include <stdint.h>
#define PCI_VENDOR_ID 0x00 // 2
#define PCI_DEVICE_ID 0x02 // 2
#define PCI_COMMAND 0x04 // 2
#define PCI_STATUS 0x06 // 2
#define PCI_REVISION_ID 0x08 // 1
#define PCI_PROG_IF 0x09 // 1
#define PCI_SUBCLASS 0x0a // 1
#define PCI_CLASS 0x0b // 1
#define PCI_CACHE_LINE_SIZE 0x0c // 1
#define PCI_LATENCY_TIMER 0x0d // 1
#define PCI_HEADER_TYPE 0x0e // 1
#define PCI_BIST 0x0f // 1
#define PCI_BAR0 0x10 // 4
#define PCI_BAR1 0x14 // 4
#define PCI_BAR2 0x18 // 4
#define PCI_BAR3 0x1C // 4
#define PCI_BAR4 0x20 // 4
#define PCI_BAR5 0x24 // 4
#define PCI_INTERRUPT_LINE 0x3C // 1
#define PCI_INTERRUPT_PIN 0x3D
#define PCI_SECONDARY_BUS 0x19 // 1
#define PCI_HEADER_TYPE_DEVICE 0
#define PCI_HEADER_TYPE_BRIDGE 1
#define PCI_HEADER_TYPE_CARDBUS 2
#define PCI_TYPE_BRIDGE 0x0604
#define PCI_TYPE_SATA 0x0106
#define PCI_ADDRESS_PORT 0xCF8
#define PCI_VALUE_PORT 0xCFC
#define PCI_NONE 0xFFFF
typedef void (*pci_func_t)(uint32_t device, uint16_t vendor_id, uint16_t device_id, void *arg);
static inline int pci_get_bus(uint32_t device)
{
return (uint8_t)((device >> 16));
}
static inline int pci_get_slot(uint32_t device)
{
return (uint8_t)((device >> 8));
}
static inline int pci_get_func(uint32_t device)
{
return (uint8_t)(device);
}
static inline uint32_t pci_get_addr(uint32_t device, int field)
{
return 0x80000000 | (pci_get_bus(device) << 16) | (pci_get_slot(device) << 11) | (pci_get_func(device) << 8) | ((field) & 0xFC);
}
static inline uint32_t pci_box_device(int bus, int slot, int func)
{
return (uint32_t)((bus << 16) | (slot << 8) | func);
}
extern uint32_t pci_read_field(uint32_t device, int field, int size);
extern void pci_write_field(uint32_t device, int field, int size, uint32_t value);
extern uint16_t pci_find_type(uint32_t dev);
#endif

161
kexts/drivers/bus/pci/main.c Normal file
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#include <socks/kext.h>
#include <socks/device.h>
#include <socks/printk.h>
#include <socks/pci.h>
#include <socks/libc/stdio.h>
#include <arch/ports.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);
}
}
}
static void init_pci_device(uint32_t device, uint16_t vendid, uint16_t devid, void *arg)
{
struct device *dev = generic_device_create();
snprintf(dev->dev_name, sizeof dev->dev_name, "%02x:%02x.%u",
pci_get_bus(device),
pci_get_slot(device),
pci_get_func(device));
device_register(dev, pci_driver, bus_device_base(pci_bus));
}
static kern_status_t pci_bus_scan(struct device *bus)
{
printk("pci: scanning for devices...");
pci_scan(init_pci_device, -1, NULL);
return KERN_OK;
}
static struct bus_device_ops pci_bus_ops = {
.scan = pci_bus_scan,
};
static kern_status_t online(struct kext *self)
{
pci_driver = driver_create(self, "pci");
if (!pci_driver) {
return KERN_NO_MEMORY;
}
driver_register(pci_driver);
pci_bus = bus_device_create();
struct device *pci_base = bus_device_base(pci_bus);
snprintf(pci_base->dev_name, sizeof pci_base->dev_name, "pci");
pci_bus->b_ops = &pci_bus_ops;
device_register(pci_base, pci_driver, root_device());
return KERN_OK;
}
DEFINE_KEXT("net.doorstuck.socks.pci",
online, NULL,
KEXT_NO_DEPENDENCIES);