kernel: remove the keyboard driver, add a `/ps2` device

7 files changed, 39 insertions, 64 deletions

diff --git a/src/kernel/arch/i386/driver/ps2.c b/src/kernel/arch/i386/driver/ps2.c
new file mode 100644
index 0000000..1af3166
--- /dev/null
+++ b/src/kernel/arch/i386/driver/ps2.c
@@ -0,0 +1,28 @@
+#include <kernel/arch/i386/driver/ps2.h>
+#include <kernel/arch/i386/interrupts/irq.h>
+#include <shared/mem.h>
+
+#define BACKLOG_CAPACITY 16
+
+/* TODO move away from tty/ */
+
+static volatile uint8_t backlog[BACKLOG_CAPACITY] = {};
+static volatile size_t backlog_size = 0;
+
+void ps2_recv(uint8_t s) {
+	if (backlog_size >= BACKLOG_CAPACITY) return;
+	backlog[backlog_size++] = s;
+}
+
+size_t ps2_read(uint8_t *buf, size_t max_len) {
+	irq_interrupt_flag(true);
+	while (backlog_size == 0)
+		asm("hlt" ::: "memory");
+	irq_interrupt_flag(false);
+
+	size_t len = backlog_size;
+	if (len > max_len) len = max_len;
+	backlog_size = 0;
+	memcpy(buf, (void*)backlog, len);
+	return len;
+}
diff --git a/src/kernel/arch/i386/driver/ps2.h b/src/kernel/arch/i386/driver/ps2.h
new file mode 100644
index 0000000..4b56056
--- /dev/null
+++ b/src/kernel/arch/i386/driver/ps2.h
@@ -0,0 +1,7 @@
+#pragma once
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+void	ps2_recv(uint8_t scancode);
+size_t	ps2_read(uint8_t *buf, size_t max_len);
diff --git a/src/kernel/arch/i386/interrupts/isr.c b/src/kernel/arch/i386/interrupts/isr.c
index 001827a..e3bb6d6 100644
--- a/src/kernel/arch/i386/interrupts/isr.c
+++ b/src/kernel/arch/i386/interrupts/isr.c
@@ -1,7 +1,7 @@
+#include <kernel/arch/i386/driver/ps2.h>
 #include <kernel/arch/i386/interrupts/irq.h>
 #include <kernel/arch/i386/interrupts/isr.h>
 #include <kernel/arch/i386/port_io.h>
-#include <kernel/arch/i386/tty/keyboard.h>
 #include <kernel/arch/io.h>
 #include <kernel/panic.h>
 #include <kernel/proc.h>
@@ -20,7 +20,7 @@ void isr_stage3(int interrupt) {
 			return;
 
 		case 0x21: // keyboard irq
-			keyboard_recv(port_in8(0x60));
+			ps2_recv(port_in8(0x60));
 			irq_eoi(1);
 			return;
 
diff --git a/src/kernel/arch/i386/tty/keyboard.c b/src/kernel/arch/i386/tty/keyboard.c
deleted file mode 100644
index a321aab..0000000
--- a/src/kernel/arch/i386/tty/keyboard.c
+++ /dev/null
@@ -1,30 +0,0 @@
-#include <kernel/arch/i386/tty/keyboard.h>
-#include <kernel/arch/i386/tty/ps2_keymap.h>
-
-static volatile bool keyboard_pressed = false;
-static volatile char keyboard_char;
-
-static bool keys[0x80] = {0};
-
-void keyboard_recv(uint8_t s) {
-	bool shift = keys[0x2A] || keys[0x36];
-	bool down = !(s & 0x80);
-	s &= 0x7f;
-	keys[s] = down;
-
-	char c = shift ? keymap_upper[s] : keymap_lower[s];
-
-	if (down && c) {
-		keyboard_char = c;
-		keyboard_pressed = true;
-	}
-}
-
-bool keyboard_poll_read(char *c) {
-	if (!keyboard_pressed) return false;
-	keyboard_pressed = false;
-	*c = keyboard_char;
-	return true;
-}
-
-
diff --git a/src/kernel/arch/i386/tty/keyboard.h b/src/kernel/arch/i386/tty/keyboard.h
deleted file mode 100644
index c3a8232..0000000
--- a/src/kernel/arch/i386/tty/keyboard.h
+++ /dev/null
@@ -1,6 +0,0 @@
-#pragma once
-#include <stdbool.h>
-#include <stdint.h>
-
-bool keyboard_poll_read(char *c);
-void keyboard_recv(uint8_t scancode);
diff --git a/src/kernel/arch/i386/tty/ps2_keymap.h b/src/kernel/arch/i386/tty/ps2_keymap.h
deleted file mode 100644
index 891b9d7..0000000
--- a/src/kernel/arch/i386/tty/ps2_keymap.h
+++ /dev/null
@@ -1,23 +0,0 @@
-#pragma once
-
-static const char keymap_lower[] = {
-	'\0', '\0', '1',  '2',  '3',  '4',  '5',  '6',  '7',  '8',  '9',  '0',  '-',  '=',  '\b', '\t',
-	'q',  'w',  'e',  'r',  't',  'y',  'u',  'i',  'o',  'p',  '[',  ']',  '\r', '\0', 'a',  's',
-	'd',  'f',  'g',  'h',  'j',  'k',  'l',  '\0', '\'', '`',  '\0', '\\', 'z',  'x',  'c',  'v',
-	'b',  'n',  'm',  ',',  '.',  '/',  '\0', '*',  '\0', ' ',  '\0', '\0', '\0', '\0', '\0', '\0',
-	'\0', '\0', '\0', '\0', '\0', '\0', '\0', '7',  '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1',
-	'2',  '3',  '0',  '.',  '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
-	'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
-	'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
-};
-
-static const char keymap_upper[] = {
-	'\0', '\0', '!',  '@',  '#',  '$',  '%',  '^',  '&',  '*',  '(',  ')',  '_',  '+',  '\b', '\t',
-	'Q',  'W',  'E',  'R',  'T',  'Y',  'U',  'I',  'O',  'P',  '{',  '}',  '\r', '\0', 'A',  'S',
-	'D',  'F',  'G',  'H',  'J',  'K',  'L',  ':',  '"',  '~',  '\0', '|',  'Z',  'X',  'C',  'V',
-	'B',  'N',  'M',  '<',  '>',  '?',  '\0', '*',  '\0', ' ',  '\0', '\0', '\0', '\0', '\0', '\0',
-	'\0', '\0', '\0', '\0', '\0', '\0', '\0', '7',  '8',  '9',  '-',  '4',  '5',  '6',  '+',  '1',
-	'2',  '3',  '0',  '.',  '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
-	'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
-	'\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0',
-};
diff --git a/src/kernel/arch/i386/tty/tty.c b/src/kernel/arch/i386/tty/tty.c
index a63c16a..ebe0fd3 100644
--- a/src/kernel/arch/i386/tty/tty.c
+++ b/src/kernel/arch/i386/tty/tty.c
@@ -1,5 +1,4 @@
 #include <kernel/arch/i386/interrupts/irq.h>
-#include <kernel/arch/i386/tty/keyboard.h>
 #include <kernel/arch/i386/tty/serial.h>
 #include <kernel/arch/i386/tty/vga.h>
 #include <kernel/arch/io.h>
@@ -17,11 +16,11 @@ void tty_read(char *buf, size_t len) {
 	irq_interrupt_flag(true);
 	for (size_t i = 0; i < len; i++) {
 		for (;;) {
-			if (serial_poll_read(&buf[i]))		break;
-			if (keyboard_poll_read(&buf[i]))	break;
+			if (serial_poll_read(&buf[i]))	break;
 			asm("hlt" ::: "memory");
 		}
 	}
+	irq_interrupt_flag(false);
 }
 
 void tty_write(const char *buf, size_t len) {