2022-03-16 13:54:26 +08:00

112 lines
3.2 KiB
C
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

#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);
}