From fdcfd48a2404fc67959bc8df4f0daed8bf730314 Mon Sep 17 00:00:00 2001
From: "Myles \"Mellurboo\" Wilson"
 <102391892+Mellurboo@users.noreply.github.com>
Date: Sun, 10 May 2026 10:22:18 +0100
Subject: [PATCH] pr: Removed Unnessisary Flipping on kconsole leading to
 Vastly Faster Boot Times & PS/2 Hardware Correctness (#12)

* Flush PS/2 Devices on boot to avoid Locking dependent on the out buffer on real hardware / emulated PS2 over USB

Removed Slow and Unnessisarty flipping causing kconsole write slowdowns consequently speeding up the boot process

* sod wc
---
 src/core/kconsole.c  |  6 +-----
 src/dev/ps2.c        |  3 +++
 src/dev/ps2.h        |  8 ++++++++
 src/input/keyboard.c | 13 +++++++++++++
 src/input/keyboard.h |  3 +++
 src/mem/paging.c     |  3 ++-
 6 files changed, 30 insertions(+), 6 deletions(-)

diff --git a/src/core/kconsole.c b/src/core/kconsole.c
index 7a01d2e..51f3ea5 100644
--- a/src/core/kconsole.c
+++ b/src/core/kconsole.c
@@ -49,7 +49,6 @@ static void kconsole_putc_nolock(char c) {
         cursor_x = 10;
         cursor_y += CHAR_HEIGHT;
         kconsole_scroll();
-        graphics_flip_buffer();
         return;
     }
 
@@ -89,12 +88,9 @@ void kconsole_write(const char *s) {
         spinlock_release_irqrestore(&console_lock, flags);
         return;
     }
-
+    
     while (*s) {
         kconsole_putc_nolock(*s++);
     }
-    
-    // Flip once after a write batch to keep console updates coherent.
-    graphics_flip_buffer();
     spinlock_release_irqrestore(&console_lock, flags);
 }
diff --git a/src/dev/ps2.c b/src/dev/ps2.c
index ce575be..9225c3a 100644
--- a/src/dev/ps2.c
+++ b/src/dev/ps2.c
@@ -109,6 +109,9 @@ uint8_t mouse_read(void) {
 
 void mouse_init(void) {
     uint8_t status;
+    int limit = 128;
+    while (limit-- > 0 && (inb(PS2_STATUS_PORT) & PS2_STATUS_OUT_FULL))
+        (void)inb(PS2_DATA_PORT);
 
     // Enable Aux Device
     mouse_wait(0);
diff --git a/src/dev/ps2.h b/src/dev/ps2.h
index 01a0a88..c483920 100644
--- a/src/dev/ps2.h
+++ b/src/dev/ps2.h
@@ -4,11 +4,19 @@
 #ifndef PS2_H
 #define PS2_H
 
+#define PS2_DATA_PORT       0x60
+#define PS2_CMD_PORT        0x64
+#define PS2_STATUS_PORT     0x64
+#define PS2_STATUS_OUT_FULL 0x01
+#define PS2_STATUS_IN_FULL  0x02
+#define PS2_STATUS_AUX_DATA 0x20
+
 #include <stdint.h>
 
 void ps2_init(void);
 #include "process.h"
 
+
 uint64_t timer_handler(registers_t *regs);
 uint64_t keyboard_handler(registers_t *regs);
 uint64_t mouse_handler(registers_t *regs);
diff --git a/src/input/keyboard.c b/src/input/keyboard.c
index a26d60f..a4533e6 100644
--- a/src/input/keyboard.c
+++ b/src/input/keyboard.c
@@ -1,5 +1,7 @@
 #include "keyboard.h"
 #include "keymap.h"
+#include "../core/io.h"
+#include "../dev/ps2.h"
 
 typedef struct {
     bool e0_prefix;
@@ -88,6 +90,17 @@ static const uint16_t set1_ext[128] = {
 };
 
 void keyboard_init(void) {
+    /*
+        Flush all data in the controller output buffer
+        this can cause the PS/2 Keyboard device to not work
+        on real hardware specifically
+        (even when Legacy USB keyboard Emulation is emulating the PS/2 keyboard)
+        Myles
+    */
+    int limit = 128;
+    while (limit-- > 0 && (inb(PS2_STATUS_PORT) & PS2_STATUS_OUT_FULL))
+        (void)inb(KBD_DATA_PORT);
+
     g_kb.e0_prefix = false;
     g_kb.left_shift = false;
     g_kb.right_shift = false;
diff --git a/src/input/keyboard.h b/src/input/keyboard.h
index d9ecd79..88a005c 100644
--- a/src/input/keyboard.h
+++ b/src/input/keyboard.h
@@ -1,6 +1,9 @@
 #ifndef KEYBOARD_H
 #define KEYBOARD_H
 
+#define KBD_DATA_PORT       0x60
+#define KBD_CMD_PORT        0x64
+
 #include <stdint.h>
 #include <stdbool.h>
 #include "keycodes.h"
diff --git a/src/mem/paging.c b/src/mem/paging.c
index 04d2858..81a4c39 100644
--- a/src/mem/paging.c
+++ b/src/mem/paging.c
@@ -6,6 +6,8 @@
 #include "platform.h"
 #include <stddef.h>
 
+#define MSR_WC  0x277
+
 static uint64_t current_pml4_phys = 0;
 
 // Get current CR3 value
@@ -37,7 +39,6 @@ static uint64_t alloc_page_table_phys(void) {
 }
 
 void paging_init(void) {
-
     current_pml4_phys = read_cr3() & PT_ADDR_MASK;
 }