ahci内存越界问题修复+ mm的bug修复+在rust中解析acpi table (#384)

* bugfix: 修复了Flusher Drop的时候没有自动刷新TLB的bug

* 解决进程管理未初始化时，trap.c尝试打印pid导致错误的问题

* 设置kmalloc默认强制清0

* 修复ahci驱动的内存越界问题
* 修复mmio buddy忘记归还buddy block的问题
* 新增acpi模块,暂时能解析acpi tables

kernel/src/driver/disk/ahci/ahcidisk.rs

@@ -23,7 +23,7 @@ use alloc::sync::Weak;
 use alloc::{string::String, sync::Arc, vec::Vec};
 
 use core::fmt::Debug;
-use core::sync::atomic::compiler_fence;
+use core::sync::atomic::{compiler_fence, Ordering};
 use core::{mem::size_of, ptr::write_bytes};
 
 /// @brief: 只支持MBR分区格式的磁盘结构体
@@ -60,9 +60,10 @@ impl AhciDisk {
         count: usize,          // 读取lba的数量
         buf: &mut [u8],
     ) -> Result<usize, SystemError> {
+        assert!((buf.len() & 511) == 0);
         compiler_fence(core::sync::atomic::Ordering::SeqCst);
         let check_length = ((count - 1) >> 4) + 1; // prdt length
-        if count * 512 > buf.len() || check_length > u16::MAX as usize {
+        if count * 512 > buf.len() || check_length > 8 as usize {
             kerror!("ahci read: e2big");
             // 不可能的操作
             return Err(SystemError::E2BIG);
@@ -89,11 +90,7 @@ impl AhciDisk {
                 .unwrap()
         };
 
-        volatile_write_bit!(
-            cmdheader.cfl,
-            (1 << 5) - 1 as u8,
-            (size_of::<FisRegH2D>() / size_of::<u32>()) as u8
-        ); // Command FIS size
+        cmdheader.cfl = (size_of::<FisRegH2D>() / size_of::<u32>()) as u8;
 
         volatile_set_bit!(cmdheader.cfl, 1 << 6, false); //  Read/Write bit : Read from device
         volatile_write!(cmdheader.prdtl, check_length as u16); // PRDT entries count
@@ -109,10 +106,8 @@ impl AhciDisk {
             false
         };
         let mut kbuf = if user_buf {
-            let mut x: Vec<u8> = Vec::with_capacity(buf.len());
-            unsafe {
-                x.set_len(buf.len());
-            }
+            let mut x: Vec<u8> = Vec::new();
+            x.resize(buf.len(), 0);
             Some(x)
         } else {
             None
@@ -134,11 +129,12 @@ impl AhciDisk {
             // 清空整个table的旧数据
             write_bytes(cmdtbl, 0, 1);
         }
+        // kdebug!("cmdheader.prdtl={}", volatile_read!(cmdheader.prdtl));
 
         // 8K bytes (16 sectors) per PRDT
         for i in 0..((volatile_read!(cmdheader.prdtl) - 1) as usize) {
             volatile_write!(cmdtbl.prdt_entry[i].dba, virt_2_phys(buf_ptr) as u64);
-            volatile_write_bit!(cmdtbl.prdt_entry[i].dbc, (1 << 22) - 1, 8 * 1024 - 1); // 数据长度 prdt_entry.dbc
+            cmdtbl.prdt_entry[i].dbc = 8 * 1024 - 1;
             volatile_set_bit!(cmdtbl.prdt_entry[i].dbc, 1 << 31, true); // 允许中断 prdt_entry.i
             buf_ptr += 8 * 1024;
             tmp_count -= 16;
@@ -147,11 +143,8 @@ impl AhciDisk {
         // Last entry
         let las = (volatile_read!(cmdheader.prdtl) - 1) as usize;
         volatile_write!(cmdtbl.prdt_entry[las].dba, virt_2_phys(buf_ptr) as u64);
-        volatile_write_bit!(
-            cmdtbl.prdt_entry[las].dbc,
-            (1 << 22) - 1,
-            ((tmp_count << 9) - 1) as u32
-        ); // 数据长度
+        cmdtbl.prdt_entry[las].dbc = ((tmp_count << 9) - 1) as u32; // 数据长度
+
         volatile_set_bit!(cmdtbl.prdt_entry[las].dbc, 1 << 31, true); // 允许中断
 
         // 设置命令
@@ -219,9 +212,10 @@ impl AhciDisk {
         count: usize,
         buf: &[u8],
     ) -> Result<usize, SystemError> {
+        assert!((buf.len() & 511) == 0);
         compiler_fence(core::sync::atomic::Ordering::SeqCst);
         let check_length = ((count - 1) >> 4) + 1; // prdt length
-        if count * 512 > buf.len() || check_length > u16::MAX as usize {
+        if count * 512 > buf.len() || check_length > 8 as usize {
             // 不可能的操作
             return Err(SystemError::E2BIG);
         } else if count == 0 {
@@ -369,8 +363,6 @@ impl LockedAhciDisk {
         ctrl_num: u8,
         port_num: u8,
     ) -> Result<Arc<LockedAhciDisk>, SystemError> {
-        let mut part_s: Vec<Arc<Partition>> = Vec::new();
-
         // 构建磁盘结构体
         let result: Arc<LockedAhciDisk> = Arc::new(LockedAhciDisk(SpinLock::new(AhciDisk {
             name,
@@ -382,22 +374,24 @@ impl LockedAhciDisk {
         })));
 
         let table: MbrDiskPartionTable = result.read_mbr_table()?;
-        let weak_this: Weak<LockedAhciDisk> = Arc::downgrade(&result); // 获取this的弱指针
 
         // 求出有多少可用分区
         for i in 0..4 {
+            compiler_fence(Ordering::SeqCst);
             if table.dpte[i].part_type != 0 {
-                part_s.push(Partition::new(
+                let w = Arc::downgrade(&result);
+                result.0.lock().partitions.push(Partition::new(
                     table.dpte[i].starting_sector() as u64,
                     table.dpte[i].starting_lba as u64,
                     table.dpte[i].total_sectors as u64,
-                    weak_this.clone(),
+                    w,
                     i as u16,
                 ));
             }
         }
-        result.0.lock().partitions = part_s;
-        result.0.lock().self_ref = weak_this;
+
+        result.0.lock().self_ref = Arc::downgrade(&result);
+
         return Ok(result);
     }
 
@@ -409,7 +403,7 @@ impl LockedAhciDisk {
         let mut buf: Vec<u8> = Vec::new();
         buf.resize(size_of::<MbrDiskPartionTable>(), 0);
 
-        BlockDevice::read_at(self, 0, 1, &mut buf)?;
+        self.read_at(0, 1, &mut buf)?;
         // 创建 Cursor 用于按字节读取
         let mut cursor = VecCursor::new(buf);
         cursor.seek(SeekFrom::SeekCurrent(446))?;