rk/ps2.c

#include <ps2.h>
#include <io.h>
#include <pic8259.h>
#include <vga.h>
#include <printf.h>
#include <strcmp.h>
#include <ide.h>

#define cpu_relax asm volatile ("pause" ::);

char shell_buffer[512];
int shell_index;

// TODO: Support dual ports
void initialize_8042ps2() {
    // disable ps/2 ports so nothing gets messed up
    outportb(PS2_8042_COMMAND, 0xAD);
    outportb(PS2_8042_COMMAND, 0xA7);

    // flush output buffer
    inportb(PS2_8042_DATA);

    // get config byte
    outportb(PS2_8042_COMMAND, 0x20);
    uint8_t config = inportb(0x60);
    // disable IRQs and translation, also make sure 0 vals are 0
    config &= 0b00110100;
    // write our config byte back
    outportb(PS2_8042_COMMAND, 0x60);
    while (inportb(PS2_8042_STATUS) & 0x2) cpu_relax;
    outportb(PS2_8042_DATA, config);

    // perform self test
    outportb(PS2_8042_COMMAND, 0xAA);
    while (!(inportb(PS2_8042_STATUS) & 0x1)) cpu_relax;
    uint8_t result = inportb(PS2_8042_DATA);
    if (result == 0x55) printf("Passed PS/2 self test\n");
    else printf("Failed!\n");

    // perform port test
    outportb(PS2_8042_COMMAND, 0xAB);
    while (!(inportb(PS2_8042_STATUS) & 0x1)) cpu_relax;
    result = inportb(PS2_8042_DATA);
    if (!result) printf("Passed PS/2 port 1 test\n");
    else printf("Failed!\n");

    // enable ps/2 port
    outportb(PS2_8042_COMMAND, 0xAE);

    // enable IRQ 1
    config = 0b01100101;
    outportb(PS2_8042_COMMAND, 0x60);
    while (inportb(PS2_8042_STATUS) & 0x2) cpu_relax;
    outportb(PS2_8042_DATA, config);
}

void ps2_handler() {
    uint8_t scancode = inportb(0x60);

    if (scancode > 0x80) goto eoi;

    switch(scancode) {
        case KBD_ESC:
            break;
        case KBD_1:
            _putchar('1');
            shell_buffer[shell_index++] = '1';
            break;
        case KBD_2:
            _putchar('2');
            shell_buffer[shell_index++] = '2';
            break;
        case KBD_3:
            _putchar('3');
            shell_buffer[shell_index++] = '3';
            break;
        case KBD_4:
            _putchar('4');
            shell_buffer[shell_index++] = '4';
            break;
        case KBD_5:
            _putchar('5');
            shell_buffer[shell_index++] = '5';
            break;
        case KBD_6:
            _putchar('6');
            shell_buffer[shell_index++] = '6';
            break;
        case KBD_7:
            _putchar('7');
            shell_buffer[shell_index++] = '7';
            break;
        case KBD_8:
            _putchar('8');
            shell_buffer[shell_index++] = '8';
            break;
        case KBD_9:
            _putchar('9');
            shell_buffer[shell_index++] = '9';
            break;
        case KBD_0:
            _putchar('0');
            shell_buffer[shell_index++] = '0';
            break;
        case KBD_MINUS:
            _putchar('-');
            shell_buffer[shell_index++] = '-';
            break;
        case KBD_EQUALS:
            _putchar('=');
            shell_buffer[shell_index++] = '=';
            break;
        case KBD_BACKSPACE:
            if (shell_index > 0) {
                popchar();
                shell_buffer[--shell_index] = 0;
            }
            break;
        case KBD_TAB:
            break;
        case KBD_Q:
            _putchar('Q');
            shell_buffer[shell_index++] = 'Q';
            break;
        case KBD_W:
            _putchar('W');
            shell_buffer[shell_index++] = 'W';
            break;
        case KBD_E:
            _putchar('E');
            shell_buffer[shell_index++] = 'E';
            break;
        case KBD_R:
            _putchar('R');
            shell_buffer[shell_index++] = 'R';
            break;
        case KBD_T:
            _putchar('T');
            shell_buffer[shell_index++] = 'T';
            break;
        case KBD_Y:
            _putchar('Y');
            shell_buffer[shell_index++] = 'Y';
            break;
        case KBD_U:
            _putchar('U');
            shell_buffer[shell_index++] = 'U';
            break;
        case KBD_I:
            _putchar('I');
            shell_buffer[shell_index++] = 'I';
            break;
        case KBD_O:
            _putchar('O');
            shell_buffer[shell_index++] = 'O';
            break;
        case KBD_P:
            _putchar('P');
            shell_buffer[shell_index++] = 'P';
            break;
        case KBD_LBRACKET:
            _putchar('[');
            shell_buffer[shell_index++] = '[';
            break;
        case KBD_RBRACKET:
            _putchar(']');
            shell_buffer[shell_index++] = ']';
            break;
        case KBD_ENTER:
            printf("\n");
            if (strcmp(shell_buffer, "PINGAS") == 0) {
                printf("andew pingas detected");
            } else if (strcmp(shell_buffer, "HELLO") == 0) {
                printf("hi");
            } else if (strcmp(shell_buffer, "READ") == 0) {
                uint8_t sector[512] = {0};
                ata_read_sector(ATA_PRIMARY, ATA_MASTER, 0, sector);
                for (int i = 0; i < 512; i++) {
                    _putchar(sector[i]);
                }
            } else {
                printf("unknown command '%s' idiot", shell_buffer);
            }
            for (int i = 0; i < 512; i++) {
                shell_buffer[i] = 0;
            }
            shell_index = 0;
            printf("\n$ ");
            break;
        case KBD_LCTRL:
            // Handle left control key
            break;
        case KBD_A:
            _putchar('A');
            shell_buffer[shell_index++] = 'A';
            break;
        case KBD_S:
            _putchar('S');
            shell_buffer[shell_index++] = 'S';
            break;
        case KBD_D:
            _putchar('D');
            shell_buffer[shell_index++] = 'D';
            break;
        case KBD_F:
            _putchar('F');
            shell_buffer[shell_index++] = 'F';
            break;
        case KBD_G:
            _putchar('G');
            shell_buffer[shell_index++] = 'G';
            break;
        case KBD_H:
            _putchar('H');
            shell_buffer[shell_index++] = 'H';
            break;
        case KBD_J:
            _putchar('J');
            shell_buffer[shell_index++] = 'J';
            break;
        case KBD_K:
            _putchar('K');
            shell_buffer[shell_index++] = 'K';
            break;
        case KBD_L:
            _putchar('L');
            shell_buffer[shell_index++] = 'L';
            break;
        case KBD_SEMICOLON:
            _putchar(';');
            shell_buffer[shell_index++] = ';';
            break;
        case KBD_APOSTROPHE:
            _putchar('\'');
            shell_buffer[shell_index++] = '\'';
            break;
        case KBD_GRAVE:
            _putchar('`');
            shell_buffer[shell_index++] = '`';
            break;
        case KBD_LSHIFT:
            // Handle left shift key
            break;
        case KBD_BACKSLASH:
            _putchar('\\');
            shell_buffer[shell_index++] = '\\';
            break;
        case KBD_Z:
            _putchar('Z');
            shell_buffer[shell_index++] = 'Z';
            break;
        case KBD_X:
            _putchar('X');
            shell_buffer[shell_index++] = 'X';
            break;
        case KBD_C:
            _putchar('C');
            shell_buffer[shell_index++] = 'C';
            break;
        case KBD_V:
            _putchar('V');
            shell_buffer[shell_index++] = 'V';
            break;
        case KBD_B:
            _putchar('B');
            shell_buffer[shell_index++] = 'B';
            break;
        case KBD_N:
            _putchar('N');
            shell_buffer[shell_index++] = 'N';
            break;
        case KBD_M:
            _putchar('M');
            shell_buffer[shell_index++] = 'M';
            break;
        case KBD_COMMA:
            _putchar(',');
            shell_buffer[shell_index++] = ',';
            break;
        case KBD_PERIOD:
            _putchar('.');
            shell_buffer[shell_index++] = '.';
            break;
        case KBD_SLASH:
            _putchar('/');
            shell_buffer[shell_index++] = '/';
            break;
        case KBD_RSHIFT:
            // Handle right shift key
            break;
        case KBD_PRINTSCREEN:
            // Handle print screen key
            break;
        case KBD_LALT:
            // Handle left alt key
            break;
        case KBD_SPACE:
            _putchar(' ');
            shell_buffer[shell_index++] = ' ';
            break;
        case KBD_CAPSLOCK:
            // Handle caps lock key
            break;
        case KBD_F1:
            // Handle F1 key
            break;
        case KBD_F2:
            // Handle F2 key
            break;
        case KBD_F3:
            // Handle F3 key
            break;
        case KBD_F4:
            // Handle F4 key
            break;
        case KBD_F5:
            // Handle F5 key
            break;
        case KBD_F6:
            // Handle F6 key
            break;
        case KBD_F7:
            // Handle F7 key
            break;
        case KBD_F8:
            // Handle F8 key
            break;
        case KBD_F9:
            // Handle F9 key
            break;
        case KBD_F10:
            // Handle F10 key
            break;
        case KBD_NUMLOCK:
            // Handle num lock key
            break;
        case KBD_SCROLLLOCK:
            // Handle scroll lock key
            break;
        case KBD_HOME:
            // Handle home key
            break;
        case KBD_UP:
            // Handle up arrow key
            break;
        case KBD_PAGEUP:
            // Handle page up key
            break;
        case KBD_KP_MINUS:
            // Handle keypad minus key
            break;
        case KBD_LEFT:
            // Handle left arrow key
            break;
        case KBD_KP_5:
            // Handle keypad 5 key
            break;
        case KBD_RIGHT:
            // Handle right arrow key
            break;
        case KBD_KP_PLUS:
            // Handle keypad plus key
            break;
        case KBD_END:
            // Handle end key
            break;
        case KBD_DOWN:
            // Handle down arrow key
            break;
        case KBD_PAGEDOWN:
            // Handle page down key
            break;
        case KBD_INSERT:
            // Handle insert key
            break;
        case KBD_DELETE:
            // Handle delete key
            break;
        case KBD_SYSRQ:
            // Handle system request key
            break;
        case KBD_F11:
            // Handle F11 key
            break;
        case KBD_F12:
            // Handle F12 key
            break;
        case KBD_KP_ENTER:
            break;
        case KBD_RCTRL:
            // Handle right control key
            break;
        case KBD_KP_DIVIDE:
            // Handle keypad divide key
            break;
        case KBD_PRINTSCREEN2:
            // Handle print screen key (alternate)
            break;
        case KBD_RALT:
            // Handle right alt key
            break;
        case KBD_HOME2:
            // Handle home key (alternate)
            break;
        case KBD_UP2:
            // Handle up arrow key (alternate)
            break;
        case KBD_PAGEUP2:
            // Handle page up key (alternate)
            break;
        case KBD_LEFT2:
            // Handle left arrow key (alternate)
            break;
        case KBD_RIGHT2:
            // Handle right arrow key (alternate)
            break;
        case KBD_END2:
            // Handle end key (alternate)
            break;
        case KBD_DOWN2:
            // Handle down arrow key (alternate)
            break;
        case KBD_PAGEDOWN2:
            // Handle page down key (alternate)
            break;
        case KBD_INSERT2:
            // Handle insert key (alternate)
            break;
        case KBD_DELETE2:
            // Handle delete key (alternate)
            break;
        default:
            // Handle unknown scan codes
            printf("Unknown scan code\n");
            break;
    }
eoi:
    pic_send_eoi(1);
}