d0f7acf9eb
An x86-64 operating system built from xv6, now largely rewritten: SMP, a copy-on-write root filesystem (SchFS), PCI/USB/virtio drivers, a TTF rasteriser, and a Linux-numbered syscall ABI. No history before this point -- the tree was never under version control. This commit exists so the rename that follows has something to undo to.
75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
#include "types.h"
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#include "x86.h"
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#include "defs.h"
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#include "kbd.h"
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#include "input.h"
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int
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kbdgetc(void)
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{
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static uint shift;
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static uchar *charcode[4] = {
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normalmap, shiftmap, ctlmap, ctlmap
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};
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uint st, data, c;
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st = inb(KBSTATP);
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if((st & KBS_DIB) == 0)
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return -1;
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if(st & 0x20)
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return -1;
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data = inb(KBDATAP);
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if(data == 0xE0){
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shift |= E0ESC;
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return 0;
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}
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// Feed /dev/input/event0 before the byte is turned into a character. This
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// has to happen here rather than in a second handler because the byte can
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// only be read from the port once -- whoever reads it owes it to everyone
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// else. The console path below is untouched: both consumers see every key.
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input_ps2_scancode(data, (shift & E0ESC) != 0);
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// While something holds an exclusive grab on the keyboard, the console gets
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// nothing. The shift/caps state below is still tracked, so releasing the
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// grab does not leave the line discipline believing a modifier is held.
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if(input_is_grabbed(INPUT_KBD)){
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if(data & 0x80){
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data = (shift & E0ESC ? data : data & 0x7F);
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shift &= ~(shiftcode[data] | E0ESC);
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} else {
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shift |= shiftcode[data];
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shift ^= togglecode[data];
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}
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return 0;
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}
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if(data & 0x80){
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data = (shift & E0ESC ? data : data & 0x7F);
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shift &= ~(shiftcode[data] | E0ESC);
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return 0;
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} else if(shift & E0ESC){
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data |= 0x80;
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shift &= ~E0ESC;
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}
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shift |= shiftcode[data];
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shift ^= togglecode[data];
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c = charcode[shift & (CTL | SHIFT)][data];
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if(shift & CAPSLOCK){
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if('a' <= c && c <= 'z')
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c += 'A' - 'a';
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else if('A' <= c && c <= 'Z')
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c += 'a' - 'A';
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}
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return c;
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}
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void
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kbdintr(void)
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{
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consoleintr(kbdgetc);
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}
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