mirror of
https://github.com/JannisHeydemann/BoredOS.git
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src/kernel --> src/
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boreddevnl
229
src/dev/ps2.c
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229
src/dev/ps2.c
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// Copyright (c) 2023-2026 Chris (boreddevnl)
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// This software is released under the GNU General Public License v3.0. See LICENSE file for details.
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// This header needs to maintain in any file it is present in, as per the GPL license terms.
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#include "ps2.h"
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#include "io.h"
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#include "wm.h"
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#include "network.h"
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#include <stdbool.h>
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extern void serial_print(const char *s);
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extern void serial_print_hex(uint64_t n);
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// --- Timer Handler ---
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volatile uint64_t kernel_ticks = 0;
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uint64_t timer_handler(registers_t *regs) {
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kernel_ticks++;
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wm_timer_tick();
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network_process_frames();
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outb(0x20, 0x20); // EOI after processing to prevent nested timer interrupts
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extern uint64_t process_schedule(uint64_t current_rsp);
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return process_schedule((uint64_t)regs);
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}
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// --- Keyboard ---
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static bool shift_pressed = false;
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bool ps2_ctrl_pressed = false;
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static bool extended_scancode = false;
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static char scancode_map[128] = {
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0, 27, '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', '\b',
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'\t', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', '\n',
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21, 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', '`', 0,
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'\\', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', 0, '*',
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22, ' ', 23, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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};
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static char scancode_map_shift[128] = {
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0, 27, '!', '@', '#', '$', '%', '^', '&', '*', '(', ')', '_', '+', '\b',
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'\t', 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', 'O', 'P', '{', '}', '\n',
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21, 'A', 'S', 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', '"', '~', 0,
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'|', 'Z', 'X', 'C', 'V', 'B', 'N', 'M', '<', '>', '?', 0, '*',
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22, ' ', 23, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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};
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uint64_t keyboard_handler(registers_t *regs) {
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uint8_t scancode = inb(0x60);
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if (scancode == 0xE0) {
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extended_scancode = true;
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outb(0x20, 0x20);
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return (uint64_t)regs;
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}
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if (scancode == 0x1D) {
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ps2_ctrl_pressed = true;
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extended_scancode = false; // Reset if Ctrl is pressed (prevents E0 1D bug)
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} else if (scancode == 0x9D) {
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ps2_ctrl_pressed = false;
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extended_scancode = false;
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}
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if (ps2_ctrl_pressed && scancode == 0x2E) {
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extern process_t* process_get_current(void);
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process_t* proc = process_get_current();
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if (proc && proc->is_user && proc->is_terminal_proc && proc->ui_window) {
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// Only kill if the associated terminal window is focused
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if (((Window*)proc->ui_window)->focused) {
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extern uint64_t process_terminate_current(void);
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outb(0x20, 0x20); // EOI before context switch
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return process_terminate_current();
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}
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}
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}
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if (scancode == 0x2A || scancode == 0x36) { // Shift Down
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shift_pressed = true;
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} else if (scancode == 0xAA || scancode == 0xB6) { // Shift Up
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shift_pressed = false;
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} else if (!(scancode & 0x80)) { // Key Press (not release)
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if (extended_scancode) {
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extended_scancode = false;
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switch (scancode) {
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case 0x48: wm_handle_key(17, true); break; // Up arrow
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case 0x50: wm_handle_key(18, true); break; // Down arrow
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case 0x4B: wm_handle_key(19, true); break; // Left arrow
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case 0x4D: wm_handle_key(20, true); break; // Right arrow
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}
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} else {
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char c = shift_pressed ? scancode_map_shift[scancode] : scancode_map[scancode];
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if (c) {
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wm_handle_key(c, true);
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}
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}
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} else if (scancode & 0x80) { // Key release
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if (extended_scancode) {
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extended_scancode = false;
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switch (scancode & 0x7F) { // Strip the release bit
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case 0x48: wm_handle_key(17, false); break; // Up arrow
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case 0x50: wm_handle_key(18, false); break; // Down arrow
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case 0x4B: wm_handle_key(19, false); break; // Left arrow
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case 0x4D: wm_handle_key(20, false); break; // Right arrow
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}
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} else {
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char c = shift_pressed ? scancode_map_shift[scancode & 0x7F] : scancode_map[scancode & 0x7F];
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if (c) {
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wm_handle_key(c, false);
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}
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}
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}
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outb(0x20, 0x20); // EOI
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return (uint64_t)regs;
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}
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// --- Mouse ---
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static uint8_t mouse_cycle = 0;
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static int8_t mouse_byte[4];
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static bool mouse_has_wheel = false;
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void mouse_wait(uint8_t type) {
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uint32_t timeout = 100000;
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if (type == 0) { // Write
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while (timeout--) {
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if ((inb(0x64) & 2) == 0) return;
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}
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} else { // Read
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while (timeout--) {
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if ((inb(0x64) & 1) == 1) return;
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}
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}
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}
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void mouse_write(uint8_t write) {
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mouse_wait(0);
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outb(0x64, 0xD4);
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mouse_wait(0);
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outb(0x60, write);
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}
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uint8_t mouse_read(void) {
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mouse_wait(1);
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return inb(0x60);
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}
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void mouse_init(void) {
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uint8_t status;
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// Enable Aux Device
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mouse_wait(0);
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outb(0x64, 0xA8);
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// Enable Interrupts
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mouse_wait(0);
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outb(0x64, 0x20);
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mouse_wait(1);
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status = inb(0x60) | 2;
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mouse_wait(0);
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outb(0x64, 0x60);
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mouse_wait(0);
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outb(0x60, status);
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// Set Defaults
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mouse_write(0xF6);
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mouse_read();
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// Enable Wheel - Magic Sequence
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mouse_write(0xF3); mouse_read(); mouse_write(200); mouse_read();
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mouse_write(0xF3); mouse_read(); mouse_write(100); mouse_read();
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mouse_write(0xF3); mouse_read(); mouse_write(80); mouse_read();
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mouse_write(0xF2);
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mouse_read();
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uint8_t id = mouse_read();
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if (id == 3) mouse_has_wheel = true;
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// Enable Streaming
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mouse_write(0xF4);
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mouse_read();
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}
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uint64_t mouse_handler(registers_t *regs) {
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uint8_t status = inb(0x64);
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if (!(status & 0x20)) {
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outb(0x20, 0x20);
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outb(0xA0, 0x20);
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return (uint64_t)regs;
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}
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uint8_t b = inb(0x60);
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if (mouse_cycle == 0) {
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if ((b & 0x08) == 0) {
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// Out of sync
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} else {
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mouse_byte[0] = b;
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mouse_cycle++;
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}
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} else if (mouse_cycle == 1) {
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mouse_byte[1] = b;
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mouse_cycle++;
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} else if (mouse_cycle == 2) {
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mouse_byte[2] = b;
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if (mouse_has_wheel) {
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mouse_cycle++;
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} else {
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mouse_cycle = 0;
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int8_t dx = mouse_byte[1];
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int8_t dy = mouse_byte[2];
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wm_handle_mouse(dx, -dy, mouse_byte[0] & 0x07, 0);
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}
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} else if (mouse_cycle == 3) {
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mouse_byte[3] = b;
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mouse_cycle = 0;
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int8_t dx = mouse_byte[1];
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int8_t dy = mouse_byte[2];
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int8_t dz = mouse_byte[3];
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wm_handle_mouse(dx, -dy, mouse_byte[0] & 0x07, -dz);
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}
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outb(0x20, 0x20);
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outb(0xA0, 0x20);
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return (uint64_t)regs;
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}
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void ps2_init(void) {
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mouse_init();
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}
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