58 lines
1.0 KiB
C
58 lines
1.0 KiB
C
#include "keymap.h"
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#include "stdio.h"
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#include "type.h"
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#include "x86.h"
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#define KB_INBUF_SIZE 4
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typedef struct kb_inbuf {
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u8* p_head;
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u8* p_tail;
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int count;
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u8 buf[KB_INBUF_SIZE];
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} KB_INPUT;
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static KB_INPUT kb_input = {
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.p_head = kb_input.buf,
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.p_tail = kb_input.buf,
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.count = 0,
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};
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/*
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* 将ch这个字符放进内核的字符缓冲区
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*/
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void
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add_keyboard_buf(u8 ch)
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{
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if (kb_input.count < KB_INBUF_SIZE) {
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*(kb_input.p_head) = ch;
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kb_input.p_head ++;
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if (kb_input.p_head == kb_input.buf + KB_INBUF_SIZE) {
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kb_input.p_head = kb_input.buf;
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}
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kb_input.count ++;
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}
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}
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/*
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* 如果内核的字符缓冲区为空，则返回-1
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* 否则返回缓冲区队头的字符并弹出队头
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*/
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u8
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getch(void)
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{
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if (kb_input.count == 0)
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return -1;
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else {
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// disable_int();
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// in user mode, cli and sti will only cause protection exception
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u8 val = *(kb_input.p_tail);
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kb_input.p_tail ++;
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if (kb_input.p_tail == kb_input.buf + KB_INBUF_SIZE) {
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kb_input.p_tail = kb_input.buf;
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}
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kb_input.count --;
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// enable_int();
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return val;
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}
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} |