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.
93 lines
2.9 KiB
C
93 lines
2.9 KiB
C
#pragma once
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#include "types.h"
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// Raw input events -- Linux's evdev interface.
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//
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// The console gives characters. That is the right thing for a shell and the
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// wrong thing for everything else: a character stream has no key *releases*,
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// no way to tell left shift from right, no notion of a key being held, and no
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// mouse at all. A game holding W to walk forward, or a compositor deciding
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// which window a click landed in, needs the events underneath the characters.
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//
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// The layout is Linux's, deliberately. It is what every program that reads input
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// already speaks -- SDL, X, libinput, every game engine -- so a program that
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// runs on Linux reads input here without a porting layer. It costs nothing to
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// match: the struct is four fields.
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//
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// Nodes are /dev/input/event0 (keyboard) and /dev/input/event1 (mouse).
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struct input_timeval {
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int64 tv_sec;
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int64 tv_usec;
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};
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struct input_event {
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struct input_timeval time;
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uint16 type;
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uint16 code;
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int32 value;
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};
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// Event types.
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#define EV_SYN 0x00
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#define EV_KEY 0x01
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#define EV_REL 0x02
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#define EV_ABS 0x03
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#define EV_MSC 0x04
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#define SYN_REPORT 0
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// Relative axes.
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#define REL_X 0x00
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#define REL_Y 0x01
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#define REL_WHEEL 0x08
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// Buttons live in the EV_KEY code space alongside keys, which is why the
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// keyboard's codes stop well below 0x100.
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#define BTN_LEFT 0x110
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#define BTN_RIGHT 0x111
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#define BTN_MIDDLE 0x112
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// Key codes worth naming. The rest are the AT scancode-set-1 numbers, which
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// Linux's keycodes were derived from and still match for everything below
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// 0x54 -- that is not a coincidence and it is why the PS/2 path needs no
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// translation table for unprefixed bytes.
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#define KEY_RESERVED 0
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#define KEY_ESC 1
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#define KEY_ENTER 28
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#define KEY_LEFTCTRL 29
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#define KEY_LEFTSHIFT 42
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#define KEY_RIGHTSHIFT 54
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#define KEY_LEFTALT 56
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#define KEY_SPACE 57
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#define KEY_RIGHTCTRL 97
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#define KEY_RIGHTALT 100
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#define KEY_HOME 102
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#define KEY_UP 103
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#define KEY_PAGEUP 104
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#define KEY_LEFT 105
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#define KEY_RIGHT 106
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#define KEY_END 107
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#define KEY_DOWN 108
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#define KEY_PAGEDOWN 109
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#define KEY_INSERT 110
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#define KEY_DELETE 111
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#define KEY_LEFTMETA 125
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#define KEY_RIGHTMETA 126
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#define KEY_MAX 255
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// EVIOCGRAB -- take/release exclusive access to a device.
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//
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// Linux's _IOW('E', 0x90, int). Spelled as the resulting constant rather than
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// built from an _IOW macro because Schunix has no ioctl-encoding macros and
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// inventing a set just for this would be a bigger change than the feature.
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// A non-zero argument grabs, zero releases; the argument is passed by value.
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#define EVIOCGRAB 0x40044590
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// Which device an event came from. Both are minor numbers under the input
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// major, and both are the index into the driver's array.
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#define INPUT_KBD 0
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#define INPUT_MOUSE 1
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#define NINPUTDEV 2
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