🆕 键盘驱动上半部

2025-06-18 20:36:31 +00:00 · 2022-03-16 13:54:26 +08:00
parent fcb3930ab7
commit 832442af6a
8 changed files with 176 additions and 13 deletions
--- a/kernel/driver/keyboard/keyboard.c
+++ b/kernel/driver/keyboard/keyboard.c
@ -0,0 +1,111 @@
+#include "keyboard.h"
+#include "../interrupt/apic/apic.h"
+#include "../../mm/mm.h"
+#include "../../mm/slab.h"
+#include "../../common/printk.h"
+
+static struct keyboard_input_buffer *kb_buf_ptr = NULL;
+static int shift_l, shift_r, ctrl_l, ctrl_r, alt_l, alt_r;
+struct apic_IO_APIC_RTE_entry entry;
+
+hardware_intr_controller keyboard_intr_controller =
+    {
+        .enable = apic_ioapic_enable,
+        .disable = apic_ioapic_disable,
+        .install = apic_ioapic_install,
+        .uninstall = apic_ioapic_uninstall,
+        .ack = apic_ioapic_edge_ack,
+
+};
+
+/**
+ * @brief 键盘中断处理函数（中断上半部）
+ *  将数据存入缓冲区
+ * @param irq_num 中断向量号
+ * @param param 参数
+ * @param regs 寄存器信息
+ */
+void keyboard_handler(ul irq_num, ul param, struct pt_regs *regs)
+{
+    // 读取键盘输入的信息
+    unsigned x = io_in8(0x60);
+    printk_color(ORANGE, BLACK, "key_pressed:%02x\n", x);
+
+    // 当头指针越过界时，恢复指向数组头部
+    if (kb_buf_ptr->ptr_head == kb_buf_ptr + keyboard_buffer_size)
+        kb_buf_ptr->ptr_head = kb_buf_ptr->buffer;
+
+    if (kb_buf_ptr->count >= keyboard_buffer_size)
+    {
+        kwarn("Keyboard input buffer is full.");
+        return;
+    }
+
+    *kb_buf_ptr->ptr_head = x;
+    ++(kb_buf_ptr->count);
+    ++(kb_buf_ptr->ptr_head);
+}
+/**
+ * @brief 初始化键盘驱动程序的函数
+ *
+ */
+void keyboard_init()
+{
+    // ======= 初始化键盘循环队列缓冲区 ===========
+
+    // 申请键盘循环队列缓冲区的内存
+    kb_buf_ptr = (struct keyboard_input_buffer *)kmalloc(sizeof(struct keyboard_input_buffer), 0);
+
+    kb_buf_ptr->ptr_head = kb_buf_ptr;
+    kb_buf_ptr->ptr_tail = kb_buf_ptr;
+    kb_buf_ptr->count = 0;
+
+    memset(kb_buf_ptr->buffer, 0, keyboard_buffer_size);
+
+    // ======== 初始化中断RTE entry ==========
+
+    entry.vector = 0x21;                // 设置中断向量号
+    entry.deliver_mode = IO_APIC_FIXED; // 投递模式：混合
+    entry.dest_mode = DEST_PHYSICAL;    // 物理模式投递中断
+    entry.deliver_status = IDLE;
+    entry.trigger_mode = EDGE_TRIGGER; // 设置边沿触发
+    entry.polarity = POLARITY_HIGH;    // 高电平触发
+    entry.remote_IRR = IRR_RESET;
+    entry.mask = MASKED;
+    entry.reserved = 0;
+
+    entry.destination.physical.reserved1 = 0;
+    entry.destination.physical.reserved2 = 0;
+    entry.destination.physical.phy_dest = 0; // 设置投递到BSP处理器
+
+    // ======== 初始化键盘控制器，写入配置值 =========
+    wait_keyboard_write();
+    io_out8(PORT_KEYBOARD_CONTROL, KEYBOARD_COMMAND_WRITE);
+    wait_keyboard_write();
+    io_out8(PORT_KEYBOARD_DATA, KEYBOARD_PARAM_INIT);
+    wait_keyboard_write();
+
+    // 执行一百万次nop，等待键盘控制器把命令执行完毕
+    for (int i = 0; i < 1000; ++i)
+        for (int j = 0; j < 1000; ++j)
+            nop();
+    shift_l = 0;
+    shift_r = 0;
+    ctrl_l = 0;
+    ctrl_r = 0;
+    alt_l = 0;
+    alt_r = 0;
+
+    // 注册中断处理程序
+    irq_register(0x21, &entry, &keyboard_handler, (ul)kb_buf_ptr, &keyboard_intr_controller, "ps/2 keyboard");
+}
+
+/**
+ * @brief 键盘驱动卸载函数
+ *
+ */
+void keyboard_exit()
+{
+    irq_unregister(0x21);
+    kfree((ul *)kb_buf_ptr);
+}