forked from Bananymous/banan-os
114 lines
2.7 KiB
C++
114 lines
2.7 KiB
C++
#include <kernel/IO.h>
|
|
#include <kernel/PCI.h>
|
|
|
|
#define INVALID 0xFFFF
|
|
#define MULTI_FUNCTION 0x80
|
|
|
|
#define CONFIG_ADDRESS 0xCF8
|
|
#define CONFIG_DATA 0xCFC
|
|
|
|
namespace Kernel
|
|
{
|
|
|
|
static PCI* s_instance = nullptr;
|
|
|
|
void PCI::initialize()
|
|
{
|
|
ASSERT(s_instance == nullptr);
|
|
s_instance = new PCI();
|
|
ASSERT(s_instance);
|
|
s_instance->check_all_buses();
|
|
}
|
|
|
|
PCI& PCI::get()
|
|
{
|
|
ASSERT(s_instance);
|
|
return *s_instance;
|
|
}
|
|
|
|
static uint32_t read_config_dword(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset)
|
|
{
|
|
uint32_t config_addr = 0x80000000 | ((uint32_t)bus << 16) | ((uint32_t)dev << 11) | ((uint32_t)func << 8) | offset;
|
|
IO::outl(CONFIG_ADDRESS, config_addr);
|
|
return IO::inl(CONFIG_DATA);
|
|
}
|
|
|
|
static uint16_t get_vendor_id(uint8_t bus, uint8_t dev, uint8_t func)
|
|
{
|
|
uint32_t dword = read_config_dword(bus, dev, func, 0x00);
|
|
return dword & 0xFFFF;
|
|
}
|
|
|
|
static uint8_t get_header_type(uint8_t bus, uint8_t dev, uint8_t func)
|
|
{
|
|
uint32_t dword = read_config_dword(bus, dev, func, 0x0C);
|
|
return (dword >> 16) & 0xFF;
|
|
}
|
|
|
|
void PCI::check_function(uint8_t bus, uint8_t dev, uint8_t func)
|
|
{
|
|
MUST(m_devices.emplace_back(bus, dev, func));
|
|
auto& device = m_devices.back();
|
|
if (device.class_code() == 0x06 && device.subclass() == 0x04)
|
|
check_bus(device.read_byte(0x19));
|
|
}
|
|
|
|
void PCI::check_device(uint8_t bus, uint8_t dev)
|
|
{
|
|
if (get_vendor_id(bus, dev, 0) == INVALID)
|
|
return;
|
|
|
|
check_function(bus, dev, 0);
|
|
if (get_header_type(bus, dev, 0) & MULTI_FUNCTION)
|
|
for (uint8_t func = 1; func < 8; func++)
|
|
if (get_vendor_id(bus, dev, func) != INVALID)
|
|
check_function(bus, dev, func);
|
|
}
|
|
|
|
void PCI::check_bus(uint8_t bus)
|
|
{
|
|
for (uint8_t dev = 0; dev < 32; dev++)
|
|
check_device(bus, dev);
|
|
}
|
|
|
|
void PCI::check_all_buses()
|
|
{
|
|
if (get_header_type(0, 0, 0) & MULTI_FUNCTION)
|
|
{
|
|
for (int func = 0; func < 8 && get_vendor_id(0, 0, func) != INVALID; func++)
|
|
check_bus(func);
|
|
}
|
|
else
|
|
{
|
|
check_bus(0);
|
|
}
|
|
}
|
|
|
|
PCIDevice::PCIDevice(uint8_t bus, uint8_t dev, uint8_t func)
|
|
: m_bus(bus), m_dev(dev), m_func(func)
|
|
{
|
|
uint32_t type = read_word(0x0A);
|
|
m_class_code = (uint8_t)(type >> 8);
|
|
m_subclass = (uint8_t)(type);
|
|
}
|
|
|
|
uint32_t PCIDevice::read_dword(uint8_t offset) const
|
|
{
|
|
ASSERT((offset & 0x03) == 0);
|
|
return read_config_dword(m_bus, m_dev, m_func, offset);
|
|
}
|
|
|
|
uint16_t PCIDevice::read_word(uint8_t offset) const
|
|
{
|
|
ASSERT((offset & 0x01) == 0);
|
|
uint32_t dword = read_config_dword(m_bus, m_dev, m_func, offset & 0xFC);
|
|
return (uint16_t)(dword >> (8 * (offset & 0x03)));
|
|
}
|
|
|
|
uint8_t PCIDevice::read_byte(uint8_t offset) const
|
|
{
|
|
uint32_t dword = read_config_dword(m_bus, m_dev, m_func, offset & 0xFC);
|
|
return (uint8_t)(dword >> (8 * (offset & 0x03)));
|
|
}
|
|
|
|
} |