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Offer more capabilities for the drivers

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This commit is contained in:
Baptiste Wicht 2016-07-03 21:31:44 +02:00
parent 9d52e2390f
commit 2b975b4a1b
2 changed files with 34 additions and 18 deletions
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3
kernel/include/pci.hpp
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@ -51,6 +51,9 @@ void detect_devices();
size_t number_of_devices();
device_descriptor& device(size_t index);
uint32_t read_config_dword(uint8_t bus, uint8_t device, uint8_t function, uint8_t offset);
void write_config_dword(uint8_t bus, uint8_t device, uint8_t function, uint8_t offset, uint32_t value);
} //end of namespace pci
#endif

49
kernel/src/pci.cpp
View File

@ -18,50 +18,37 @@ std::vector<pci::device_descriptor> devices;
#define PCI_CONFIG_ADDRESS 0xCF8
#define PCI_CONFIG_DATA 0xCFC
uint32_t pci_config_read_dword (uint8_t bus, uint8_t device, uint8_t function, uint8_t offset){
uint32_t address =
static_cast<uint32_t>(1 << 31) //enabled
| (uint32_t(bus) << 16) //bus number
| (uint32_t(device) << 11) //device number
| (uint32_t(function) << 8) //function number
| ((uint32_t(offset) ) & 0xfc); //Register number
out_dword(PCI_CONFIG_ADDRESS, address);
return in_dword(PCI_CONFIG_DATA);
}
uint16_t get_vendor_id(uint8_t bus, uint8_t device, uint8_t function){
// read "device id | vendor id"
auto large = pci_config_read_dword(bus, device, function, 0);
auto large = pci::read_config_dword(bus, device, function, 0);
// extract vendor id
return large;
}
uint16_t get_device_id(uint8_t bus, uint8_t device, uint8_t function){
// read "device id | vendor id"
auto large = pci_config_read_dword(bus, device, function, 0);
auto large = pci::read_config_dword(bus, device, function, 0);
// extract device id
return large >> 16;
}
uint8_t get_class_code(uint8_t bus, uint8_t device, uint8_t function){
// read "class code | subclass | prog if | revision id"
auto large = pci_config_read_dword(bus, device, function, 8);
auto large = pci::read_config_dword(bus, device, function, 8);
// extract class code only
return large >> 24 & 0xFF;
}
uint8_t get_subclass(uint8_t bus, uint8_t device, uint8_t function){
// read "class code | subclass | prog if | revision id"
auto large = pci_config_read_dword(bus, device, function, 8);
auto large = pci::read_config_dword(bus, device, function, 8);
// extract subclass only
return large >> 16 & 0xFF;
}
uint8_t get_header_type(uint8_t bus, uint8_t device, uint8_t function){
// read "BIST | header type | latency timer | cache line size"
auto large = pci_config_read_dword(bus, device, function, 12);
auto large = pci::read_config_dword(bus, device, function, 12);
// extract header type only
return large >> 16 & 0xFF;
}
@ -139,3 +126,29 @@ size_t pci::number_of_devices(){
pci::device_descriptor& pci::device(size_t index){
return devices[index];
}
uint32_t pci::read_config_dword (uint8_t bus, uint8_t device, uint8_t function, uint8_t offset){
uint32_t address =
static_cast<uint32_t>(1 << 31) //enabled
| (uint32_t(bus) << 16) //bus number
| (uint32_t(device) << 11) //device number
| (uint32_t(function) << 8) //function number
| ((uint32_t(offset) ) & 0xfc); //Register number
out_dword(PCI_CONFIG_ADDRESS, address);
return in_dword(PCI_CONFIG_DATA);
}
void pci::write_config_dword (uint8_t bus, uint8_t device, uint8_t function, uint8_t offset, uint32_t value){
uint32_t address =
static_cast<uint32_t>(1 << 31) //enabled
| (uint32_t(bus) << 16) //bus number
| (uint32_t(device) << 11) //device number
| (uint32_t(function) << 8) //function number
| ((uint32_t(offset) ) & 0xfc); //Register number
out_dword(PCI_CONFIG_ADDRESS, address);
out_dword(PCI_CONFIG_DATA, value);
}