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Espresso 0.0.0e

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This commit is contained in:
David Goeke
2025-06-13 18:03:39 -05:00
parent 6d366537dd
commit 1e5b4a765b
40 changed files with 742 additions and 718 deletions
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90
drivers/ps2_keyboard.c
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@ -5,94 +5,18 @@
/*
PS/2 Controller IO Ports
PS/2 Controller IO Ports
The PS/2 Controller itself uses 2 IO ports (IO ports 0x60 and 0x64). Like many IO ports, reads and writes may access different internal registers.
The PS/2 Controller itself uses 2 IO ports (IO ports 0x60 and 0x64). Like many IO ports, reads and writes may access different internal registers.
Historical note: The PC-XT PPI had used port 0x61 to reset the keyboard interrupt request signal (among other unrelated functions). Port 0x61 has no keyboard related functions on AT and PS/2 compatibles.
IO Port Access Type Purpose
0x60 Read/Write Data Port
0x64 Read Status Register
0x64 Write Command Register
Historical note: The PC-XT PPI had used port 0x61 to reset the keyboard interrupt request signal (among other unrelated functions). Port 0x61 has no keyboard related functions on AT and PS/2 compatibles.
IO Port Access Type Purpose
0x60 Read/Write Data Port
0x64 Read Status Register
0x64 Write Command Register
*/
#define PS2_DATA_PORT 0x60
#define PS2_STATUS_PORT 0x64
#define KEYBOARD_IRQ 33
/*extern void register_interrupt_handler(int irq, void (*handler)(void));*/
static const char scancode_map[128] = {
0, 27, '1','2','3','4','5','6','7','8','9','0','-','=','\b', /* Backspace */
'\t', /* Tab */
'q','w','e','r','t','y','u','i','o','p','[',']','\n', /* Enter */
0, /* Control */
'a','s','d','f','g','h','j','k','l',';','\'','`',
0, /* Left shift */
'\\','z','x','c','v','b','n','m',',','.','/',
0, /* Right shift */
'*',
0, /* Alt */
' ', /* Spacebar */
0, /* Caps lock */
/* The rest are function and control keys */
};
static bool shift_pressed = false;
void keyboard_handler(isr_stack_t* regs)
{
(void)regs; /* Only here to dismiss the "Unused parameter" warnings */
printd("PS/2 Keyboard handler fired!\n");
uint8_t scancode = inb(PS2_DATA_PORT);
/* Handle shift press/release */
if (scancode == 0x2A || scancode == 0x36)
{
shift_pressed = true;
return;
}
else if (scancode == 0xAA || scancode == 0xB6)
{
shift_pressed = false;
return;
}
if (scancode & 0x80)
{
/* Key release event, ignore for now */
}
else
{
char c = scancode_map[scancode];
if (shift_pressed && c >= 'a' && c <= 'z')
{
c -= 32; /* Convert to uppercase */
}
if (c)
{
/* Do something with the keypress (e.g., print or buffer) */
printf("Char: %c", c);
}
}
outb(0x20, 0x20); /* Acknowledge PIC */
}
void test_handler(isr_stack_t* r) {
printf("IRQ1 fired!\n");
}
void keyboard_init(void)
{
outb(0x21, inb(0x21) & ~0x02);
register_interrupt_handler(KEYBOARD_IRQ, test_handler);
/* Enable keyboard (controller-specific, often optional if already working) */
//outb(0x64, 0xAE);
}