Makefile

@@ -5,7 +5,21 @@ CC = ${HOME}/opt/cross/bin/i686-elf-gcc
 CPP = ${HOME}/opt/cross/bin/i686-elf-g++ 
 CFLAGS =  -ffreestanding -O2 -Wall -Wextra
 
-OFILES =  $(BUILD_DIR)/boot.o $(BUILD_DIR)/kterm.o $(BUILD_DIR)/kernel.o  $(BUILD_DIR)/PhysicalMemoryManager.o $(BUILD_DIR)/io.o $(BUILD_DIR)/PageDirectory.o $(BUILD_DIR)/gdtc.o $(BUILD_DIR)/idt.o $(BUILD_DIR)/pci.o $(BUILD_DIR)/pic.o $(BUILD_DIR)/string.o
+OFILES = \
+$(BUILD_DIR)/boot.o \
+$(BUILD_DIR)/kterm.o \
+$(BUILD_DIR)/kernel.o \
+$(BUILD_DIR)/PhysicalMemoryManager.o \
+$(BUILD_DIR)/io.o \
+$(BUILD_DIR)/PageDirectory.o \
+$(BUILD_DIR)/gdtc.o \
+$(BUILD_DIR)/idt.o \
+$(BUILD_DIR)/pci.o \
+$(BUILD_DIR)/pic.o \
+$(BUILD_DIR)/string.o \
+$(BUILD_DIR)/pcidevice.o
+
+
 
 SRC_DIR = src
 BUILD_DIR = build
@@ -88,3 +102,6 @@ $(BUILD_DIR)/PhysicalMemoryManager.o:
 
 $(BUILD_DIR)/pci.o:
 	$(CPP) -c $(SRC_DIR)/kernel/pci.cpp  -o $(BUILD_DIR)/pci.o $(CFLAGS) -fno-exceptions -fno-rtti
+
+$(BUILD_DIR)/pcidevice.o:
+	$(CPP) -c $(SRC_DIR)/kernel/pci/pciDevice.cpp  -o $(BUILD_DIR)/pcidevice.o $(CFLAGS) -fno-exceptions -fno-rtti

src/kernel/kernel.cpp

@@ -62,53 +62,16 @@ extern "C" void kernel_main (void);
         init_serial();
         print_serial("Serial port initialized!");
 
+     
+
         // Enumerate the PCI bus
-        
+        PCI_Enumerate();        
-        int devicesFound = 0;
-        // loop through all possible busses, devices and their functions;
-        for( int bus = 0 ; bus < 256 ; bus++)
-        {
-            
-            for(int device = 0; device < 32 ; device ++)
-            {
-                for ( int function = 0; function < 8; function++)
-                {
-                
-                    uint64_t DeviceIdentify = ConfigReadWord(bus, device, function,0x0);
-                    uint32_t VendorID  = DeviceIdentify & 0xFFFF;
-                    uint32_t DeviceID = DeviceIdentify >> 16;
 
 
-
-                    if( DeviceID != 0xFFFF){
-                        printf("bus: %d, device: %d, function %d \n");
-                        printf("Device found!\n");
-                        printf("DeviceID: 0x%x, VendorID: 0x%x\n", DeviceID,  VendorID);
-
-                        uint32_t classcodes = ConfigReadWord(bus, device, function, 0x8);
-                        uint32_t classData = classcodes >> 16; // We only care for the last 2 bytes!
-                        uint32_t deviceClass = classData >> 8;
-                        uint32_t subclass = classData & 0xFF;
-
-                        printf(" class: %d, subClass: %d\n\n", deviceClass, subclass);
-                        devicesFound++;
-                
-                    }
-                
-                
-                
-                }
-
-            }
-            
-        }
-
-        printf("Found %d devices!", devicesFound);
-
         while (true){
             //Read time indefinetely 
-            //read_rtc();
+            read_rtc();
-            //printf( "UTC time: %02d-%02d-%02d %02d:%02d:%02d  [ Formatted as YY-MM-DD h:mm:ss]\r" ,year, month, day, hour, minute, second);
+            printf( "UTC time: %02d-%02d-%02d %02d:%02d:%02d  [ Formatted as YY-MM-DD h:mm:ss]\r" ,year, month, day, hour, minute, second);
             delay(1000);
         }
             

src/kernel/kernel.h

@@ -19,6 +19,7 @@ extern "C"{
 #include "pci.h"
 
 
+
 #define CHECK_FLAG(flags, bit) ((flags) & (1 <<(bit)))
 #define PANIC(message) {  return; }
 

src/kernel/pci.cpp

@@ -1,11 +1,119 @@
 #include "pci.h"
-#include "tty/kterm.h"
+
 #define PCI_BUS_ADDR_SHIFT 16
 #define PCI_DEVICE_ADDR_SHIFT  11
 #define PCI_FUNCTION_ADDR_SHIFT 8
 #define PCI_ENABLE_ADDR_SHIFT 31
 
+const char* GetClassCodeName (uint64_t ClassCode ) {
+ 
+    switch (ClassCode)
+    {
+        case 0x0 :
+            return "Unclassified";
+        break;
 
+        case 0x1:                 
+            return "Mass Storage Controller";
+        break;
+
+        case 0x2: 
+            return "Network Controller";
+        break;
+
+        case 0x3:          
+            return "Display Controller"; 
+        break;
+
+        case 0x4:          
+            return "Multimedia Controller";
+        break;
+
+        case 0x5:      
+            return "Memory Controller";
+        break;
+    
+        case 0x6:            
+            return "Bridge";
+        break;
+
+        case 0x7 :                    
+            return "Simple Communication Controller";
+        break;
+
+        case 0x8:
+            return "Base System Peripheral"; 
+        break;
+
+        case 0x9:          
+            return "Input Device Controller";
+        break;  
+
+        case 0xA:
+            return "Docking station";
+        break;  
+        case 0xB:                
+            return "Processor";
+        break;   
+        
+        case 0xC:                 
+            return "Serial Bus Controller";
+        break; 
+        
+        case 0xD:                         
+            return "Wireless Controller";
+        break;  
+        
+        case 0xE:                            
+            return "Intelligent Controller";
+        break;   
+        
+        case 0xF:         
+            return "Satellite Communication Controller";
+        break;
+
+        case 0x10:
+            return "Encryption Controller";
+        break;  
+        
+        case 0x11:       
+            return "Signal Processing Controller";
+        break;
+
+        case 0x12:
+            return "Processing Accelerator";
+        break;
+
+        case 0x13:   
+            return "Non-Essential Instrumentation"; 
+        break;
+
+        default:
+            return "Unknown";
+            break;
+        }
+    
+}
+
+const char* getVendor( uint64_t VendorID){
+    switch (VendorID)
+    {
+    case 0x8086:
+        return "Intel Corporation";
+        break;
+    
+    default:
+        return "Vendor Unkown";
+        break;
+    }
+}
+
+
+
+uint32_t ConfigReadWord ( PCIBusAddress& PCIDeviceAddress , uint8_t offset){
+    outl(CONFIG_ADDRESS , PCIDeviceAddress.getAddress() | offset );
+    return inl(CONFIG_DATA);
+}
 
 uint32_t ConfigReadWord (uint8_t bus, uint8_t device, uint8_t func, uint8_t offset){
     uint32_t address;
@@ -16,9 +124,6 @@ uint32_t ConfigReadWord (uint8_t bus, uint8_t device, uint8_t func, uint8_t offs
         ((uint32_t)device << PCI_DEVICE_ADDR_SHIFT) |
         ((uint32_t)func << PCI_FUNCTION_ADDR_SHIFT) | 
         offset );
-   // printf("PCI address read 0x%x", address);
-
-    
 
     outl(CONFIG_ADDRESS, address);
 
@@ -26,3 +131,67 @@ uint32_t ConfigReadWord (uint8_t bus, uint8_t device, uint8_t func, uint8_t offs
     return inl(CONFIG_DATA);
 }
 
+
+
+uint8_t GetHeaderType( PCIBusAddress& PCIDeviceAddress ){
+    uint32_t header_information = ConfigReadWord(PCIDeviceAddress , 0xC);
+    return (uint8_t) (
+        (header_information >> 16) //Get higher half
+        & 0x00FF ); // Select the last two bytes 
+}
+
+uint16_t GetClassCodes( PCIBusAddress& PCIDeviceAddress ){
+     uint32_t classcodes = ConfigReadWord(PCIDeviceAddress, 0x8);
+                   return (uint16_t)((uint32_t)classcodes >> 16); 
+                  
+}
+
+void PCI_Enumerate(){
+            int devicesFound = 0;
+        // loop through all possible busses, devices and their functions;
+        for( int bus = 0 ; bus < 256 ; bus++)
+        {
+            
+            for(int device = 0; device < 32 ; device ++)
+            {
+                 
+                
+                int function = 0;
+
+                //uint64_t DeviceIdentify = ConfigReadWord(bus, device, function,0x0);
+                uint32_t VendorID  = GetDevice(bus, device, function) & 0xFFFF;
+                uint32_t DeviceID = GetDevice(bus, device, function) >> 16;
+
+                
+
+                if( DeviceID != 0xFFFF){
+                    printf("Device found!\n");
+                    printf("Bus: %d, Device: %d, function: %d \n", bus, device, function);
+                    printf("DeviceID: 0x%x, VendorID: %s\n", DeviceID, getVendor(VendorID)  );
+
+                    // iterate over the functions if it is a multi function device!
+                    if( false ){
+                        for ( function ++ ; function < 8; function++)
+                        {
+                        
+                        }
+                    }
+
+                    PCIBusAddress busAddress =
+                        PCIBusAddress{bus, device, function };
+
+                    uint8_t header_type = GetHeaderType(busAddress);
+                    printf( "Header type: 0x%x\n", header_type);
+
+                    uint16_t deviceClasses = GetClassCodes(busAddress);
+                    printf(" class: %s, subClass: %d\n\n",
+                     (deviceClasses >>8) > 0x13 ? "Unknown": GetClassCodeName((deviceClasses >>8)), deviceClasses & 0xFF);
+
+                    devicesFound++;            
+                }
+            }
+            
+        }
+
+        printf("Found %d PCI devices!\n", devicesFound);
+}

src/kernel/pci.h

@@ -1,17 +1,35 @@
 #pragma once
 #include <stdint.h>
 #include "io.h"
+#include "tty/kterm.h"
+#include "pci/pciDevice.h"
+
 // Configuration Space Access Mechanism #1
 #define CONFIG_ADDRESS 0xCF8 // Configuration adress that is to be accessed
 #define CONFIG_DATA 0xCFC // Will do the actual configuration operation
 
+extern const char* ClassCodeTable [0x13];
+
+
+
+// Note: this could be used to make the api for receiving PCI class codes a bit 
+// nicer.
+struct ClassCodes {
+    uint8_t ClassCode;
+    uint8_t DeviceClass;
+}__attribute__((packed));
+
 uint32_t ConfigReadWord (uint8_t bus, uint8_t device, uint8_t func, uint8_t offset);
+uint32_t ConfigReadWord ( PCIBusAddress& PCIDeviceAddress , uint8_t offset);
 
+ inline uint64_t GetDevice (int bus, int device, int function ){
+     return ConfigReadWord(bus, device, function,0x0);
+ }
 
-inline uint16_t getVendorID(uint8_t bus, uint8_t device, uint8_t function ){
+uint8_t GetHeaderType( PCIBusAddress& PCIDeviceAddress );
-        return  ConfigReadWord ( bus , device, function, 0);
-}
 
-inline uint16_t getDeviceID(uint8_t bus, uint8_t device, uint8_t function ){
+uint16_t GetClassCodes( PCIBusAddress& PICDeviceAddress );
-    return ConfigReadWord(bus, device, function , 16);
+const char* getVendor( uint64_t VendorID);
-}
+const char* GetClassCodeName (uint64_t ClassCode );
+
+void PCI_Enumerate();

src/kernel/pci/pciDevice.cpp

@@ -0,0 +1,7 @@
+ #include "pciDevice.h"
+
+// NOTE: we would really like to return a pointer 
+// to the newly created PCIBusAddress struct; 
+ PCIBusAddress const PCIDevice::PCIAddress(){
+     return PCIBusAddress{bus ,device, function};
+ }

src/kernel/pci/pciDevice.h

@@ -0,0 +1,36 @@
+#pragma once 
+#include <stdint.h>
+
+/*
+* PCI devices API 
+*/
+struct PCIBusAddress{
+
+    int bus ;
+    int device ;
+    int function[8];
+
+
+    uint32_t getAddress( int deviceFunction = 0 ){
+        return ((uint32_t) 1 << 31) |
+                ((uint32_t) bus << 16) |
+                ((uint32_t) device << 11)|
+                ((uint32_t) function[deviceFunction] << 8) |
+                0x0000;
+
+    };
+};
+
+class PCIDevice {
+    public : 
+         PCIDevice (PCIBusAddress* , int );
+         ~PCIDevice();
+         PCIBusAddress const PCIAddress();
+
+    private:
+        int bus;
+        int device;
+        int function;
+        int headerType;
+
+};