vulcanos/kernel/drivers/keyboard.c
ice-bit 52bb2609ae Now this should be complete
Added basic shell and fixed various bugs...now iceos should be
"complete".
2019-07-08 18:43:45 +02:00

118 lines
3.7 KiB
C

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