1 #include "types.h" 2 #include "x86.h" 3 #include "defs.h" 4 #include "kbd.h" 5 6 int kbdgetc(void)7kbdgetc(void) 8 { 9 static uint shift; 10 static uchar *charcode[4] = { 11 normalmap, shiftmap, ctlmap, ctlmap 12 }; 13 uint st, data, c; 14 15 st = inb(KBSTATP); 16 if((st & KBS_DIB) == 0) 17 return -1; 18 data = inb(KBDATAP); 19 20 if(data == 0xE0){ 21 shift |= E0ESC; 22 return 0; 23 } else if(data & 0x80){ 24 // Key released 25 data = (shift & E0ESC ? data : data & 0x7F); 26 shift &= ~(shiftcode[data] | E0ESC); 27 return 0; 28 } else if(shift & E0ESC){ 29 // Last character was an E0 escape; or with 0x80 30 data |= 0x80; 31 shift &= ~E0ESC; 32 } 33 34 shift |= shiftcode[data]; 35 shift ^= togglecode[data]; 36 c = charcode[shift & (CTL | SHIFT)][data]; 37 if(shift & CAPSLOCK){ 38 if('a' <= c && c <= 'z') 39 c += 'A' - 'a'; 40 else if('A' <= c && c <= 'Z') 41 c += 'a' - 'A'; 42 } 43 return c; 44 } 45 46 void kbdintr(void)47kbdintr(void) 48 { 49 consoleintr(kbdgetc); 50 } 51