nexoniarz/SchOS
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Initial commit: Schunix as it stands before the SchOS rename

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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.
This commit is contained in:
Nexoniarz 2026-08-09 13:47:01 +02:00
commit d0f7acf9eb
275 changed files with 51417 additions and 0 deletions
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75
kernel/dev/kbd.c Normal file
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#include "types.h"
#include "x86.h"
#include "defs.h"
#include "kbd.h"
#include "input.h"
int
kbdgetc(void)
{
static uint shift;
static uchar *charcode[4] = {
normalmap, shiftmap, ctlmap, ctlmap
};
uint st, data, c;
st = inb(KBSTATP);
if((st & KBS_DIB) == 0)
return -1;
if(st & 0x20)
return -1;
data = inb(KBDATAP);
if(data == 0xE0){
shift |= E0ESC;
return 0;
}
// Feed /dev/input/event0 before the byte is turned into a character. This
// has to happen here rather than in a second handler because the byte can
// only be read from the port once -- whoever reads it owes it to everyone
// else. The console path below is untouched: both consumers see every key.
input_ps2_scancode(data, (shift & E0ESC) != 0);
// While something holds an exclusive grab on the keyboard, the console gets
// nothing. The shift/caps state below is still tracked, so releasing the
// grab does not leave the line discipline believing a modifier is held.
if(input_is_grabbed(INPUT_KBD)){
if(data & 0x80){
data = (shift & E0ESC ? data : data & 0x7F);
shift &= ~(shiftcode[data] | E0ESC);
} else {
shift |= shiftcode[data];
shift ^= togglecode[data];
}
return 0;
}
if(data & 0x80){
data = (shift & E0ESC ? data : data & 0x7F);
shift &= ~(shiftcode[data] | E0ESC);
return 0;
} else if(shift & E0ESC){
data |= 0x80;
shift &= ~E0ESC;
}
shift |= shiftcode[data];
shift ^= togglecode[data];
c = charcode[shift & (CTL | SHIFT)][data];
if(shift & CAPSLOCK){
if('a' <= c && c <= 'z')
c += 'A' - 'a';
else if('A' <= c && c <= 'Z')
c += 'a' - 'A';
}
return c;
}
void
kbdintr(void)
{
consoleintr(kbdgetc);
}