设备驱动模型：完善platform bus相关内容。并注册串口到sysfs (#403)

* 完成初始化platform bus
* 删除旧的sysfs
* 把uart驱动移动到tty/serial文件夹下
* 完成将串口挂载到sysfs
* 修复vfs系统调用未能follow symlink的问题
* 修复shell未能正确获取pwd的问题

kernel/src/driver/acpi/bus.rs

@@ -0,0 +1,23 @@
+use alloc::sync::Arc;
+
+use crate::{
+    driver::base::device::{driver::Driver, Device},
+    syscall::SystemError,
+};
+
+use super::AcpiManager;
+
+impl AcpiManager {
+    /// 通过acpi来匹配驱动
+    ///
+    /// 参考 https://opengrok.ringotek.cn/xref/linux-6.1.9/drivers/acpi/bus.c#949
+    pub fn driver_match_device(
+        &self,
+        _driver: &Arc<dyn Driver>,
+        _device: &Arc<dyn Device>,
+    ) -> Result<bool, SystemError> {
+        // todo:
+
+        return Ok(false);
+    }
+}

kernel/src/driver/acpi/mod.rs

@@ -14,6 +14,7 @@ use crate::{
     },
 };
 
+pub mod bus;
 mod c_adapter;
 pub mod glue;
 pub mod old;
@@ -22,6 +23,11 @@ extern crate acpi;
 
 static mut __ACPI_TABLE: Option<acpi::AcpiTables<AcpiHandlerImpl>> = None;
 
+#[inline(always)]
+pub fn acpi_manager() -> &'static AcpiManager {
+    &AcpiManager
+}
+
 #[derive(Debug)]
 pub struct AcpiManager;