1 #include <stdio.h> 2 #include <unistd.h> 3 #include <errno.h> 4 #include <string.h> 5 #include <sys/cpu.h> 6 7 void drain_keyboard(void) 8 { 9 /* Prevent "ghost typing" and keyboard buffer snooping */ 10 volatile char junk; 11 int rv; 12 13 do { 14 rv = read(0, (char *)&junk, 1); 15 } while (rv > 0); 16 17 junk = 0; 18 19 cli(); 20 *(volatile uint8_t *)0x419 = 0; /* Alt-XXX keyboard area */ 21 *(volatile uint16_t *)0x41a = 0x1e; /* Keyboard buffer empty */ 22 *(volatile uint16_t *)0x41c = 0x1e; 23 memset((void *)0x41e, 0, 32); /* Clear the actual keyboard buffer */ 24 sti(); 25 } 26
