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Kernel: Add config read/write api to PCI

This commit is contained in:
Bananymous 2023-09-18 21:39:09 +03:00
parent bc1087f5a7
commit 0d67e46041
2 changed files with 66 additions and 13 deletions
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10
kernel/include/kernel/PCI.h
View File

@ -58,6 +58,8 @@ namespace Kernel::PCI
uint8_t read_byte(uint8_t) const;
void write_dword(uint8_t, uint32_t);
void write_word(uint8_t, uint16_t);
void write_byte(uint8_t, uint8_t);
uint8_t bus() const { return m_bus; }
uint8_t dev() const { return m_dev; }
@ -109,6 +111,14 @@ namespace Kernel::PCI
const BAN::Vector<PCI::Device>& devices() const { return m_devices; }
static uint32_t read_config_dword(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset);
static uint16_t read_config_word(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset);
static uint8_t read_config_byte(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset);
static void write_config_dword(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset, uint32_t value);
static void write_config_word(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset, uint16_t value);
static void write_config_byte(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset, uint8_t value);
private:
PCIManager() = default;
void check_function(uint8_t bus, uint8_t dev, uint8_t func);

69
kernel/kernel/PCI.cpp
View File

@ -18,29 +18,63 @@ namespace Kernel::PCI
static PCIManager* s_instance = nullptr;
static uint32_t read_config_dword(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset)
uint32_t PCIManager::read_config_dword(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset)
{
ASSERT(offset % 4 == 0);
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 void write_config_dword(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset, uint32_t value)
uint16_t PCIManager::read_config_word(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset)
{
ASSERT(offset % 2 == 0);
uint32_t dword = read_config_dword(bus, dev, func, offset & ~3);
return (dword >> ((offset & 3) * 8)) & 0xFFFF;
}
uint8_t PCIManager::read_config_byte(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset)
{
uint32_t dword = read_config_dword(bus, dev, func, offset & ~3);
return (dword >> ((offset & 3) * 8)) & 0xFF;
}
void PCIManager::write_config_dword(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset, uint32_t value)
{
ASSERT(offset % 4 == 0);
uint32_t config_addr = 0x80000000 | ((uint32_t)bus << 16) | ((uint32_t)dev << 11) | ((uint32_t)func << 8) | offset;
IO::outl(CONFIG_ADDRESS, config_addr);
IO::outl(CONFIG_DATA, value);
}
void PCIManager::write_config_word(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset, uint16_t value)
{
ASSERT(offset % 2 == 0);
uint32_t byte = (offset & 3) * 8;
uint32_t temp = read_config_dword(bus, dev, func, offset & ~3);
temp &= ~(0xFFFF << byte);
temp |= (uint32_t)value << byte;
write_config_dword(bus, dev, func, offset & ~3, temp);
}
void PCIManager::write_config_byte(uint8_t bus, uint8_t dev, uint8_t func, uint8_t offset, uint8_t value)
{
uint32_t byte = (offset & 3) * 8;
uint32_t temp = read_config_dword(bus, dev, func, offset & ~3);
temp &= ~(0xFF << byte);
temp |= (uint32_t)value << byte;
write_config_dword(bus, dev, func, offset, temp);
}
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);
uint32_t dword = PCIManager::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);
uint32_t dword = PCIManager::read_config_dword(bus, dev, func, 0x0C);
return (dword >> 16) & 0xFF;
}
@ -289,27 +323,36 @@ namespace Kernel::PCI
uint32_t PCI::Device::read_dword(uint8_t offset) const
{
ASSERT((offset & 0x03) == 0);
return read_config_dword(m_bus, m_dev, m_func, offset);
ASSERT(offset % 4 == 0);
return PCIManager::read_config_dword(m_bus, m_dev, m_func, offset);
}
uint16_t PCI::Device::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)));
ASSERT(offset % 2 == 0);
return PCIManager::read_config_word(m_bus, m_dev, m_func, offset);
}
uint8_t PCI::Device::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)));
return PCIManager::read_config_byte(m_bus, m_dev, m_func, offset);
}
void PCI::Device::write_dword(uint8_t offset, uint32_t value)
{
ASSERT((offset & 0x03) == 0);
write_config_dword(m_bus, m_dev, m_func, offset, value);
ASSERT(offset % 4 == 0);
PCIManager::write_config_dword(m_bus, m_dev, m_func, offset, value);
}
void PCI::Device::write_word(uint8_t offset, uint16_t value)
{
ASSERT(offset % 2 == 0);
PCIManager::write_config_word(m_bus, m_dev, m_func, offset, value);
}
void PCI::Device::write_byte(uint8_t offset, uint8_t value)
{
PCIManager::write_config_byte(m_bus, m_dev, m_func, offset, value);
}
BAN::ErrorOr<BAN::UniqPtr<BarRegion>> PCI::Device::allocate_bar_region(uint8_t bar_num)