119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/* The keyboard driver works with a device called PS/2: to talk with this
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* controller we can use serial communication(e.g. ports.h). The actual flow of
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* data is made with "commands", each command is one byte and the keyboard's
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* controller can send two type of response:
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* ACK(Acknowledge): to acknowledge the previous command
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* Resend: to resend the previous command due to an error.
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* We have also to wait between the command, the data and the response of
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* the PS/2 controller.
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* This device should not exists anymore in any modern computer
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* motherboard; however the CPU(or the motherboard?) should be able to
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* simulate it even if we're using some USB keyboard.
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* Apart of that the keyboard will be listen on IRQ1(33),
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* so we have to register an ISR for that.
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*/
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#include "keyboard.h"
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#include "isr.h"
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#include "ports.h"
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#include "tty.h"
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#include "../userspace/shell.h"
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#include "../libc/stdio.h"
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static void keyboard_callback();
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/* Keyboard scan codes map , layout is: standard US keyboard */
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uint8_t keyboard_scan_codes[] = {
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0, (uint8_t)27, (uint8_t)'1', (uint8_t)'2', (uint8_t)'3', (uint8_t)'4', (uint8_t)'5', (uint8_t)'6', (uint8_t)'7', (uint8_t)'8',
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(uint8_t)'0', (uint8_t)'0', (uint8_t)'-', (uint8_t)'=', (uint8_t)'\b',
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(uint8_t)'\t',
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(uint8_t)'q', (uint8_t)'w', (uint8_t)'e', (uint8_t)'r',
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(uint8_t)'t', (uint8_t)'y', (uint8_t)'u', (uint8_t)'i', (uint8_t)'o', (uint8_t)'p', (uint8_t)'[', (uint8_t)']', (uint8_t)'\n',
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0,
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(uint8_t)'a', (uint8_t)'s', (uint8_t)'d', (uint8_t)'f', (uint8_t)'g', (uint8_t)'h', (uint8_t)'j', (uint8_t)'k', (uint8_t)'l', (uint8_t)';',
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(uint8_t)'\'', (uint8_t)'`', 0,
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(uint8_t)'\\', (uint8_t)'z', (uint8_t)'x', (uint8_t)'c', (uint8_t)'v', (uint8_t)'b', (uint8_t)'n',
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(uint8_t)'m', (uint8_t)',', (uint8_t)'.', (uint8_t)'/', 0,
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(uint8_t)'*',
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0, // Alt
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(uint8_t)' ', // Spacebar
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0, // Caps lock
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0, // 59 - F1 key
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0, // 59 - F1 key
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0, 0, 0, 0, 0, 0, 0, 0,
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0, // F10
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0, // 69 - Num lock
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0, // Scroll lock
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0, // Home key
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0, // Up arrow
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0, // Page up
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(uint8_t)'-',
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0, // Left arrow
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0,
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0, // Right arrow
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(uint8_t)'+',
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0, // 79 End key
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0, // Down arrow
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0, // Page down
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0, // Insert key
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0, // Delete key
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0, 0, 0,
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0, // F11 key
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0, // F12 key
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0 // Others key are undefined
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};
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uint8_t command[512]; // Max length of a single command
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uint8_t temp[512];
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uint32_t cmd_index = 0;
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uint32_t shiftdown = 0;
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void clear() {
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for(uint16_t i = 0; i < 512; i++)
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command[i] = 0;
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}
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void clear_tmp(void) {
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for(uint16_t i = 0; i < 512; i++)
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command[i] = 0;
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}
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static void keyboard_callback() {
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uint8_t scan_code = inb(KB_DATA_PORT); // Read from keyboard
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uint8_t keycode = keyboard_scan_codes[scan_code]; // Get ASCII value
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if(scan_code & 0x80) {
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if(scan_code == 0xAA || scan_code == 0x86)
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shiftdown = 0;
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} else {
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// Handle backspace
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if(keycode == 0x08) {
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if(cmd_index <= 0) // If at start of the prompt
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return; // Do not delete it.
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cmd_index--; // Otherwise go back
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for(uint32_t i = 0; i < cmd_index; ++i)
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temp[i] = command[i];
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clear();
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for(uint32_t i = 0; i < cmd_index; ++i)
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command[i] = temp[i];
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clear_tmp();
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backspace();
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} else if(keycode == 0x0A) { // Handle Enter
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processCommand(command);
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cmd_index = 0;
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clear();
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init_prompt();
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} else {
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printf("%c", keycode);
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command[cmd_index] = keycode;
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cmd_index++;
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}
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}
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}
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void init_keyboard() {
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register_interrupt_handler(IRQ1, &keyboard_callback);
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}
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