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Kernel: PCI can now get interrupts for devices

This commit is contained in:
Bananymous 2023-10-11 22:18:58 +03:00
parent 1b9e14a53b
commit ab8b77406d
3 changed files with 71 additions and 12 deletions
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2
kernel/include/kernel/InterruptController.h
View File

@ -35,6 +35,8 @@ namespace Kernel
static void initialize(bool force_pic);
static InterruptController& get();
bool is_using_apic() const { return m_using_apic; }
void enter_acpi_mode();
private:

5
kernel/include/kernel/PCI.h
View File

@ -75,6 +75,8 @@ namespace Kernel::PCI
uint8_t header_type() const { return m_header_type; }
BAN::ErrorOr<uint8_t> get_irq();
BAN::ErrorOr<BAN::UniqPtr<BarRegion>> allocate_bar_region(uint8_t bar_num);
void enable_bus_mastering();
@ -105,6 +107,9 @@ namespace Kernel::PCI
uint8_t m_prog_if;
uint8_t m_header_type;
BAN::Optional<uint8_t> m_offset_msi;
BAN::Optional<uint8_t> m_offset_msi_x;
};
class PCIManager

76
kernel/kernel/PCI.cpp
View File

@ -15,6 +15,11 @@
#define CONFIG_DATA 0xCFC
#define PCI_REG_COMMAND 0x04
#define PCI_REG_STATUS 0x06
#define PCI_REG_CAPABILITIES 0x34
#define PCI_REG_IRQ_LINE 0x3C
#define PCI_REG_IRQ_PIN 0x44
#define PCI_CMD_IO_SPACE (1 << 0)
#define PCI_CMD_MEM_SPACE (1 << 1)
#define PCI_CMD_BUS_MASTER (1 << 2)
@ -187,10 +192,9 @@ namespace Kernel::PCI
{
ASSERT(device.header_type() == 0x00);
uint32_t command_status = device.read_dword(0x04);
// disable io/mem space while reading bar
device.write_dword(0x04, command_status & ~3);
uint16_t command = device.read_word(PCI_REG_COMMAND);
device.write_word(PCI_REG_COMMAND, command & ~(PCI_CMD_IO_SPACE | PCI_CMD_MEM_SPACE));
uint8_t offset = 0x10 + bar_num * 4;
@ -232,9 +236,9 @@ namespace Kernel::PCI
auto region = BAN::UniqPtr<BarRegion>::adopt(region_ptr);
TRY(region->initialize());
// restore old command register and enable correct IO/MEM
command_status |= (type == BarType::IO) ? 1 : 2;
device.write_dword(0x04, command_status);
// restore old command register and enable correct IO/MEM space
command |= (type == BarType::IO) ? PCI_CMD_IO_SPACE : PCI_CMD_MEM_SPACE;
device.write_word(PCI_REG_COMMAND, command);
#if DEBUG_PCI
dprintln("created BAR region for PCI {}:{}.{}",
@ -373,17 +377,65 @@ namespace Kernel::PCI
void PCI::Device::enumerate_capabilites()
{
uint16_t status = read_word(0x06);
uint16_t status = read_word(PCI_REG_STATUS);
if (!(status & (1 << 4)))
return;
uint8_t capabilities = read_byte(0x34) & 0xFC;
while (capabilities)
uint8_t capability_offset = read_byte(PCI_REG_CAPABILITIES) & 0xFC;
while (capability_offset)
{
uint16_t next = read_word(capabilities);
dprintln(" cap {2H}", next & 0xFF);
capabilities = (next >> 8) & 0xFC;
uint16_t capability_info = read_word(capability_offset);
switch (capability_info & 0xFF)
{
case 0x05:
m_offset_msi = capability_offset;
dprintln("{}:{}.{} has MSI", m_bus, m_dev, m_func);
break;
case 0x11:
m_offset_msi_x = capability_offset;
dprintln("{}:{}.{} has MSI-X", m_bus, m_dev, m_func);
break;
default:
break;
}
capability_offset = (capability_info >> 8) & 0xFC;
}
}
BAN::ErrorOr<uint8_t> PCI::Device::get_irq()
{
// Legacy PIC just uses the interrupt line field
if (!InterruptController::get().is_using_apic())
return read_byte(PCI_REG_IRQ_LINE);
// TODO: use MSI and MSI-X if supported
if (m_offset_msi.has_value())
{
}
if (m_offset_msi_x.has_value())
{
}
for (uint8_t irq_pin = 1; irq_pin <= 4; irq_pin++)
{
acpi_resource_t dest;
auto err = lai_pci_route_pin(&dest, 0, m_bus, m_dev, m_func, irq_pin);
if (err != LAI_ERROR_NONE)
{
dprintln("{}", lai_api_error_to_string(err));
continue;
}
write_byte(PCI_REG_IRQ_PIN, irq_pin);
return dest.base;
}
dwarnln("Could not allocate interrupt for PCI {}:{}.{}", m_bus, m_dev, m_func);
return BAN::Error::from_errno(ENOTSUP);
}
void PCI::Device::set_command_bits(uint16_t mask)