初步编写cpu信息获取的代码 (#406)

1. 启动时从acpi获取所有的cpu信息并存到SMP_BOOT_DATA
2. 注册cpu subsystem/bus到sysfs(暂时未添加内容)

todo:
1. build_cpu_map(在X86_64SmpManager中)
2. 实现cpu mask
3. 把cpu设备注册到sysfs

kernel/src/driver/acpi/mod.rs

@@ -1,6 +1,6 @@
 use core::{fmt::Debug, ptr::NonNull};
 
-use acpi::AcpiHandler;
+use acpi::{AcpiHandler, PlatformInfo};
 use alloc::{string::ToString, sync::Arc};
 
 use crate::{
@@ -87,6 +87,27 @@ impl AcpiManager {
     pub fn tables(&self) -> Option<&'static acpi::AcpiTables<AcpiHandlerImpl>> {
         unsafe { __ACPI_TABLE.as_ref() }
     }
+
+    /// 从acpi获取平台的信息
+    ///
+    /// 包括：
+    ///
+    /// - PowerProfile
+    /// - InterruptModel
+    /// - ProcessorInfo
+    /// - PmTimer
+    pub fn platform_info(&self) -> Option<PlatformInfo<'_, alloc::alloc::Global>> {
+        let r = self.tables()?.platform_info();
+        if let Err(ref e) = r {
+            kerror!(
+                "AcpiManager::platform_info(): failed to get platform info, error: {:?}",
+                e
+            );
+            return None;
+        }
+
+        return Some(r.unwrap());
+    }
 }
 
 #[derive(Debug, Clone, Copy)]