一小点virto，暂时就这样了

src/kernel/drivers/video/virtio.c

@@ -1,5 +1,7 @@
 #include <kernel.h>
 
+#include "virtio.h"
+
 inthandler_t old_irqhandler;
 
 static byte bus, slot, func;
@@ -16,15 +18,20 @@ void virtio_gpu_init() {
   val irq        = pci_get_drive_irq(bus, slot, func);
   old_irqhandler = inthandler_set(0x20 + irq, irqhandler);
 
-  for (uint8_t i = 0; i < 6; i++) {
+  for (int i = 0; i < 6; i++) {
     val off       = 0x10 + i * 4;
     val bar_value = read_pci(bus, slot, func, off);
     if ((bar_value & 1) == 0) {
       mmio_base = bar_value & ~0xf;
-      klogd("VirtIO GPU MMIO Base Address: 0x%08X\n", mmio_base);
+      klogd("VirtIO GPU MMIO Base Address: %p", mmio_base);
       break;
     }
   }
+
+  if (mem_get32(mmio_base) != 0x74726976) {
+    kloge("virtio-gpu: signature not found");
+    return;
+  }
 }
 
 __attr(fastcall) void irqhandler(i32 id, regs32 *regs) {

src/kernel/drivers/video/virtio.h

@@ -0,0 +1,78 @@
+#pragma once
+#include <define.h>
+
+enum virtio_gpu_ctrl_type {
+  VIRTIO_GPU_UNDEFINED = 0,
+
+  //+ 2D 命令
+  VIRTIO_GPU_CMD_GET_DISPLAY_INFO = 0x0100,
+  VIRTIO_GPU_CMD_RESOURCE_CREATE_2D,
+  VIRTIO_GPU_CMD_RESOURCE_UNREF,
+  VIRTIO_GPU_CMD_SET_SCANOUT,
+  VIRTIO_GPU_CMD_RESOURCE_FLUSH,
+  VIRTIO_GPU_CMD_TRANSFER_TO_HOST_2D,
+  VIRTIO_GPU_CMD_RESOURCE_ATTACH_BACKING,
+  VIRTIO_GPU_CMD_RESOURCE_DETACH_BACKING,
+  VIRTIO_GPU_CMD_GET_CAPSET_INFO,
+  VIRTIO_GPU_CMD_GET_CAPSET,
+  VIRTIO_GPU_CMD_GET_EDID,
+  VIRTIO_GPU_CMD_RESOURCE_ASSIGN_UUID,
+  VIRTIO_GPU_CMD_RESOURCE_CREATE_BLOB,
+  VIRTIO_GPU_CMD_SET_SCANOUT_BLOB,
+
+  //+ 3D 命令
+  VIRTIO_GPU_CMD_CTX_CREATE = 0x0200,
+  VIRTIO_GPU_CMD_CTX_DESTROY,
+  VIRTIO_GPU_CMD_CTX_ATTACH_RESOURCE,
+  VIRTIO_GPU_CMD_CTX_DETACH_RESOURCE,
+  VIRTIO_GPU_CMD_RESOURCE_CREATE_3D,
+  VIRTIO_GPU_CMD_TRANSFER_TO_HOST_3D,
+  VIRTIO_GPU_CMD_TRANSFER_FROM_HOST_3D,
+  VIRTIO_GPU_CMD_SUBMIT_3D,
+  VIRTIO_GPU_CMD_RESOURCE_MAP_BLOB,
+  VIRTIO_GPU_CMD_RESOURCE_UNMAP_BLOB,
+
+  //+ 光标命令
+  VIRTIO_GPU_CMD_UPDATE_CURSOR = 0x0300,
+  VIRTIO_GPU_CMD_MOVE_CURSOR,
+
+  //+ 成功响应
+  VIRTIO_GPU_RESP_OK_NODATA = 0x1100,
+  VIRTIO_GPU_RESP_OK_DISPLAY_INFO,
+  VIRTIO_GPU_RESP_OK_CAPSET_INFO,
+  VIRTIO_GPU_RESP_OK_CAPSET,
+  VIRTIO_GPU_RESP_OK_EDID,
+  VIRTIO_GPU_RESP_OK_RESOURCE_UUID,
+  VIRTIO_GPU_RESP_OK_MAP_INFO,
+
+  //+ 错误响应
+  VIRTIO_GPU_RESP_ERR_UNSPEC = 0x1200,
+  VIRTIO_GPU_RESP_ERR_OUT_OF_MEMORY,
+  VIRTIO_GPU_RESP_ERR_INVALID_SCANOUT_ID,
+  VIRTIO_GPU_RESP_ERR_INVALID_RESOURCE_ID,
+  VIRTIO_GPU_RESP_ERR_INVALID_CONTEXT_ID,
+  VIRTIO_GPU_RESP_ERR_INVALID_PARAMETER,
+};
+
+struct virtio_gpu_ctrl_hdr {
+  uint32_t type;
+  uint32_t flags;
+  uint64_t fence_id;
+  uint32_t ctx_id;
+  uint32_t padding;
+};
+
+struct virtio_gpu_cursor_pos {
+  uint32_t scanout_id;
+  uint32_t x;
+  uint32_t y;
+  uint32_t padding;
+};
+
+struct virtio_gpu_resource_create_2d {
+  struct virtio_gpu_ctrl_hdr hdr;         // 命令头
+  uint32_t                   resource_id; // 资源 ID
+  uint32_t                   format;      // 图形格式 (例如 VIRTIO_GPU_FORMAT_B8G8R8A8_UNORM)
+  uint32_t                   width;       // 图像宽度
+  uint32_t                   height;      // 图像高度
+};