#include "../../../Kernel/DAPI.hpp" #include "../../../Kernel/Fex.hpp" extern "C" int DriverEntry(void *Data); int CallbackHandler(KernelCallback *Data); /* The driver is * This is a driver for Fennix Driver Entry Extended Header * * * * */ HEAD(FexFormatType_Driver, FexOSType_Fennix, DriverEntry); // Ignore the warning about missing field initializers #pragma GCC diagnostic ignored "-Wmissing-field-initializers" // Extended header which is used to give additional information to the kernel __attribute__((section(".extended"))) FexExtended ExtendedHeader = { .Driver = { .Name = "Example Driver", .Type = FexDriverType_Generic, .Callback = CallbackHandler, .Bind = { .Type = BIND_INTERRUPT, .Interrupt = { .Vector = {0xFF}, }}}}; // Global variable that holds the kernel API KernelAPI *KAPI; // Macro that prints a message to UART #define print(msg) KAPI->Util.DebugPrint((char *)(msg), KAPI->Info.DriverUID) /* --------------------------------------------------------------------------------------------------------- */ // Driver entry point. This is called at initialization. "Data" argument points to the kernel API structure. int DriverEntry(void *Data) { // Check if kernel API is valid if (!Data) return INVALID_KERNEL_API; // Set the global variable to the kernel API KAPI = (KernelAPI *)Data; // Check if kernel API version is valid. this is important because the kernel API may change in the future. if (KAPI->Version.Major < 0 || KAPI->Version.Minor < 0 || KAPI->Version.Patch < 0) return KERNEL_API_VERSION_NOT_SUPPORTED; // We print "Hello World!" to UART. print("Hello World!"); return OK; } // This is called when the driver is bound to an interrupt, process, or PCI device or when the kernel wants to send a message to the driver. int CallbackHandler(KernelCallback *Data) { switch (Data->Reason) { case AcknowledgeReason: { print("Kernel acknowledged the driver."); break; } case InterruptReason: { print("Interrupt received."); break; } case StopReason: { print("Driver stopped."); break; } default: { print("Unknown reason."); break; } } return OK; }