Merge pull request #4 from Richard-Qin-001/dev/shell

Rebuilt the system's underlying structure; it is now stable enough to merge. 

The system now supports a read-only file system and has a simple shell implemented.

1 files changed, 23 insertions, 0 deletions

diff --git a/docs/dev/dev_device.md b/docs/dev/dev_device.md
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+# Dev log
+## **3.Device Model & HAL:**
+* Interrupt Controller: PLIC:
+
+    * Implement the PLIC (Platform-Level Interrupt Controller) driver.
+
+    * Set the PLIC priority threshold and enable bits during the start() phase.
+
+    * Dispatch Cause 9 (External Interrupt) in kerneltrap/usertrap.
+
+* Character Device: Interrupt-Driven Console:
+
+    * Implement a Ring Buffer. uart_putc returns immediately after writing to the buffer.
+
+    * UART transmit interrupt: triggers when the serial port is idle, the ISR takes data from the Ring Buffer and writes it to the register.
+
+    * UART receive interrupt: triggers when a key is pressed, the ISR reads the character and wakes up the process waiting to read.
+
+* Block Device: VirtIO-Blk:
+
+    * Implement a block device driver for the PCI or MMIO transport layer according to the VirtIO 2.0 standard.
+
+    * DMA: Use the Buddy System to allocate contiguous memory as the descriptor table for the Virtqueue.
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