drm: Add uDRM subproject and bridge module

.gitmodules

@@ -4,3 +4,6 @@
 [submodule "kernel/system/uapi/uapi"]
 	path = kernel/system/uapi/uapi
 	url = https://github.com/uDrivers/uAPI
+[submodule "modules/drv/gpu/drm/udrm"]
+	path = modules/drv/gpu/drm/udrm
+	url = https://github.com/uDrivers/uDRM

include/menix/system/pci/pci.h

@@ -127,11 +127,11 @@ typedef struct PciDriver
 	i32 (*probe)(PciDevice* dev);
 	// Called when a device is being removed. (Optional).
 	void (*remove)(PciDevice* dev);
-	// Called to put a device to sleep. Returns 0 if successful.
+	// Called to put a device to sleep. Returns 0 if successful. (Optional).
 	i32 (*suspend)(PciDevice* dev);
-	// Called to wake it back up again. Returns 0 if successful.
+	// Called to wake it back up again. Returns 0 if successful. (Optional).
 	i32 (*resume)(PciDevice* dev);
-	// Called to deinitialize a device during shutdown.
+	// Called to deinitialize a device during shutdown. (Optional).
 	void (*shutdown)(PciDevice* dev);
 } PciDriver;
 

kernel/system/uapi/CMakeLists.txt

@@ -2,6 +2,7 @@
 
 target_sources(menix PUBLIC
 	pci.c
+	log.c
 )
 
-target_include_directories(menix PUBLIC .)
+target_include_directories(menix PUBLIC .)

kernel/system/uapi/log.c

@@ -0,0 +1,24 @@
+// uAPI log.h implementation
+
+#include <menix/common.h>
+#include <menix/util/log.h>
+
+#include <uapi/status.h>
+#include <uapi/types.h>
+
+#define UAPI_KERNEL_API
+#define UAPI_WANTS_LOG
+#include <uapi/log.h>
+#undef UAPI_KERNEL_API
+
+void uapi_kernel_log(uapi_log_level level, const uapi_char* msg)
+{
+	switch (level)
+	{
+		case UAPI_LOG_INFO:
+		case UAPI_LOG_TRACE:
+		case UAPI_LOG_DEBUG: print_log("uapi: %s", msg); break;
+		case UAPI_LOG_WARN: print_warn("uapi: %s", msg); break;
+		case UAPI_LOG_ERROR: print_error("uapi: %s", msg); break;
+	}
+}

kernel/system/uapi/pci.c

@@ -1,4 +1,4 @@
-// uDRM Bridge
+// uAPI pci.h implementation
 
 #include <menix/common.h>
 #include <menix/io/mmio.h>
@@ -7,6 +7,11 @@
 #include <uapi/status.h>
 #include <uapi/types.h>
 
+#define UAPI_KERNEL_API
+#define UAPI_WANTS_PCI
+#include <uapi/pci.h>
+#undef UAPI_KERNEL_API
+
 uapi_status uapi_kernel_pci_cfg_read(uapi_handle handle, uapi_size offset, uapi_u8 byte_width, uapi_u64* value)
 {
 	PciDevice* const device = handle;

modules/drv/gpu/drm/CMakeLists.txt

@@ -0,0 +1,8 @@
+# Direct Rendering Manager
+
+add_module(udrm "Marvin Friedrich" "Direct Rendering Manager" MAIN OFF ON
+	udrm_bridge.c
+	udrm/src/udrm_core.c
+	udrm/src/udrm_bochs.c
+)
+target_include_directories(${MENIX_CURRENT_MOD} PRIVATE udrm/include)

modules/drv/gpu/drm/udrm_bridge.c

@@ -0,0 +1,39 @@
+// uDRM Bridge
+
+#include <menix/common.h>
+#include <menix/io/mmio.h>
+#include <menix/system/module.h>
+#include <menix/system/pci/pci.h>
+
+#include <udrm/kernel_api.h>
+#include <udrm/udrm.h>
+
+static i32 bochs_probe(PciDevice* dev)
+{
+	uapi_status status = udrm_bochs_probe(dev);
+	return status;
+}
+
+static PciVariant bochs_variant = {
+	.vendor = 0x1234,
+	.device = 0x1111,
+};
+
+static PciDriver bochs_driver = {
+	.name = "udrm_bochs",
+	.variants = &bochs_variant,
+	.num_variants = 1,
+	.probe = bochs_probe,
+};
+
+static i32 init_fn()
+{
+	udrm_initialize();
+
+	// Register all device drivers.
+	pci_register_driver(&bochs_driver);
+
+	return 0;
+}
+
+MODULE_DEFAULT(init_fn, NULL);