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https://github.com/DragonOS-Community/DragonOS.git
synced 2025-06-11 21:36:46 +00:00
112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
#include "keyboard.h"
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#include "../interrupt/apic/apic.h"
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#include "../../mm/mm.h"
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#include "../../mm/slab.h"
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#include "../../common/printk.h"
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static struct keyboard_input_buffer *kb_buf_ptr = NULL;
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static int shift_l, shift_r, ctrl_l, ctrl_r, alt_l, alt_r;
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struct apic_IO_APIC_RTE_entry entry;
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hardware_intr_controller keyboard_intr_controller =
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{
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.enable = apic_ioapic_enable,
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.disable = apic_ioapic_disable,
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.install = apic_ioapic_install,
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.uninstall = apic_ioapic_uninstall,
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.ack = apic_ioapic_edge_ack,
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};
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/**
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* @brief 键盘中断处理函数（中断上半部）
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* 将数据存入缓冲区
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* @param irq_num 中断向量号
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* @param param 参数
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* @param regs 寄存器信息
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*/
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void keyboard_handler(ul irq_num, ul param, struct pt_regs *regs)
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{
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// 读取键盘输入的信息
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unsigned x = io_in8(0x60);
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printk_color(ORANGE, BLACK, "key_pressed:%02x\n", x);
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// 当头指针越过界时，恢复指向数组头部
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if (kb_buf_ptr->ptr_head == kb_buf_ptr + keyboard_buffer_size)
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kb_buf_ptr->ptr_head = kb_buf_ptr->buffer;
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if (kb_buf_ptr->count >= keyboard_buffer_size)
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{
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kwarn("Keyboard input buffer is full.");
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return;
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}
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*kb_buf_ptr->ptr_head = x;
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++(kb_buf_ptr->count);
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++(kb_buf_ptr->ptr_head);
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}
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/**
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* @brief 初始化键盘驱动程序的函数
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*
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*/
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void keyboard_init()
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{
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// ======= 初始化键盘循环队列缓冲区 ===========
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// 申请键盘循环队列缓冲区的内存
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kb_buf_ptr = (struct keyboard_input_buffer *)kmalloc(sizeof(struct keyboard_input_buffer), 0);
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kb_buf_ptr->ptr_head = kb_buf_ptr;
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kb_buf_ptr->ptr_tail = kb_buf_ptr;
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kb_buf_ptr->count = 0;
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memset(kb_buf_ptr->buffer, 0, keyboard_buffer_size);
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// ======== 初始化中断RTE entry ==========
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entry.vector = 0x21; // 设置中断向量号
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entry.deliver_mode = IO_APIC_FIXED; // 投递模式：混合
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entry.dest_mode = DEST_PHYSICAL; // 物理模式投递中断
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entry.deliver_status = IDLE;
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entry.trigger_mode = EDGE_TRIGGER; // 设置边沿触发
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entry.polarity = POLARITY_HIGH; // 高电平触发
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entry.remote_IRR = IRR_RESET;
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entry.mask = MASKED;
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entry.reserved = 0;
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entry.destination.physical.reserved1 = 0;
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entry.destination.physical.reserved2 = 0;
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entry.destination.physical.phy_dest = 0; // 设置投递到BSP处理器
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// ======== 初始化键盘控制器，写入配置值 =========
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wait_keyboard_write();
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io_out8(PORT_KEYBOARD_CONTROL, KEYBOARD_COMMAND_WRITE);
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wait_keyboard_write();
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io_out8(PORT_KEYBOARD_DATA, KEYBOARD_PARAM_INIT);
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wait_keyboard_write();
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// 执行一百万次nop，等待键盘控制器把命令执行完毕
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for (int i = 0; i < 1000; ++i)
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for (int j = 0; j < 1000; ++j)
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nop();
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shift_l = 0;
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shift_r = 0;
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ctrl_l = 0;
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ctrl_r = 0;
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alt_l = 0;
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alt_r = 0;
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// 注册中断处理程序
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irq_register(0x21, &entry, &keyboard_handler, (ul)kb_buf_ptr, &keyboard_intr_controller, "ps/2 keyboard");
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}
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/**
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* @brief 键盘驱动卸载函数
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*
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*/
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void keyboard_exit()
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{
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irq_unregister(0x21);
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kfree((ul *)kb_buf_ptr);
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}
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