Create ps2.c

add initial ps/2 driver code. This will need wired up to be used

kernel/display.c

@@ -1,79 +1,36 @@
 #include "display.h"
-#include "io.h"
+#include "io.h" // Include your I/O header for port access
 #include "vga.h"
 
 // Initialize the display
 void init_display(void) {
-    // Initialize the VGA driver. This typically sets up the 80x25 text mode,
-    // clears the screen, and sets the cursor.
-    vga_init();
+    // Initialize VGA settings, if necessary
+    // This could involve setting up the VGA mode, etc.
+    set_display_mode(0x13); // Example: Set to 320x200 256-color mode
 }
 
 // Enumerate connected displays
 void enumerate_displays(void) {
-    // This function is often a complex operation in a real driver.
-    // In this simplified kernel/VGA text mode environment, we use printf
-    // to output a message and rely on the fact that VGA is present.
+    // This is a simplified example. Actual enumeration may require
+    // reading from specific VGA registers or using BIOS interrupts.
     
-    // Clear the display before printing a message
-    vga_clear(vga_entry_color(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK));
-    
-    // Output a simplified enumeration message
-    vga_printf("Display: Standard VGA Text Mode (80x25) Detected.\n");
-    
-    // In a real driver, you would use inb() and outb() with specific VGA ports
-    // to read information (e.g., from the CRTC registers 0x3D4/0x3D5)
-    // to check for display presence or configuration.
+    // For demonstration, we will just print a message
+    // In a real driver, you would check the VGA registers
+    // to determine connected displays.
+    clear_display();
+    // Here you would typically read from VGA registers to find connected displays
+    // For example, using inb() to read from VGA ports
 }
 
 // Set the display mode
-// NOTE: Setting arbitrary VGA modes (like 0x13 for 320x200) is very complex
-// and requires writing hundreds of register values, often done via BIOS in
-// real mode. Since we are in protected mode and have a simple text driver,
-// this function is kept simple or treated as a placeholder for full mode changes.
 void set_display_mode(uint8_t mode) {
-    // Check if the requested mode is a known mode (e.g., VGA Text Mode 3)
-    // For this example, we simply acknowledge the call.
-    // A true mode set would involve complex register sequencing.
-    
-    // The provided vga.c is a Text Mode driver, so a graphical mode set
-    // like 0x13 (320x200 256-color) would break the existing vga_printf functionality.
-    
-    // A simplified text-mode-specific response:
-    if (mode == 0x03) { // Mode 3 is standard 80x25 text mode
-        vga_printf("Display mode set to 80x25 Text Mode (Mode 0x03).\n");
-        vga_init(); // Re-initialize the text mode
-    } else {
-        // Simple I/O example based on the original structure (Caution: Incomplete for full mode set)
-        outb(VGA_PORT, mode); // Example function to write to a port
-        vga_printf("Attempting to set display mode to 0x%x. (Warning: May break current display)\n", mode);
-    }
+    // Set the VGA mode by writing to the appropriate registers
+    outb(VGA_PORT, mode); // Example function to write to a port
 }
 
 // Clear the display
 void clear_display(void) {
-    // Use the VGA driver's clear function, typically clearing to black on light grey
-    // or black on black. We'll use the black on light grey from vga_init for consistency.
-    vga_clear(vga_entry_color(VGA_COLOR_BLACK, VGA_COLOR_LIGHT_GREY));
-    // Reset cursor to 0, 0
-    vga_set_cursor_position(0, 0);
-}
-
-// Helper function to write a string
-void display_write_string(const char* str) {
-    // Use the VGA driver's string writing function
-    vga_write_string(str, my_strlen(str));
-}
-
-// Helper function to print a formatted string
-void display_printf(const char* format, ...) {
-    // Use the VGA driver's printf function
-    va_list args;
-    va_start(args, format);
-    
-    // The vga_printf function already handles the va_list internally,
-    // so we can just call it directly.
-    vga_printf(format, args);
-    
-    va_end(args);
+    // Clear the display by filling it with a color
+    // This is a placeholder for actual clearing logic
+    // You would typically write to video memory here
 }

kernel/display.h

@@ -2,21 +2,13 @@
 #define DISPLAY_H
 
 #include <stdint.h>
-#include "vga.h" // Include VGA functions
 
-#define VGA_PORT 0x3C0  // Base port for VGA (Often used for general control, though 0x3D4/0x3D5 are used for cursor)
+#define VGA_PORT 0x3C0  // Base port for VGA
 
 // Function prototypes
 void init_display(void);
 void enumerate_displays(void);
-void set_display_mode(uint8_t mode); // In this context, modes are typically BIOS or VESA modes, which are complex.
-                                      // We'll treat this as a placeholder/simple mode call.
+void set_display_mode(uint8_t mode);
 void clear_display(void);
 
-// New function to write a string using the VGA driver
-void display_write_string(const char* str);
-
-// New function to print a formatted string using the VGA driver
-void display_printf(const char* format, ...);
-
 #endif // DISPLAY_H

kernel/ps2.c

@@ -0,0 +1,117 @@
+#include "ps2.h"
+
+/* --- Low Level I/O Helpers --- */
+static inline void outb(uint16_t port, uint8_t val) {
+    asm volatile ("outb %0, %1" : : "a"(val), "Nd"(port));
+}
+
+static inline uint8_t inb(uint16_t port) {
+    uint8_t ret;
+    asm volatile ("inb %1, %0" : "=a"(ret) : "Nd"(port));
+    return ret;
+}
+
+/* --- Controller Synchronization --- */
+
+// Wait until the controller is ready to receive a byte
+static void ps2_wait_write() {
+    while (inb(PS2_STATUS_REG) & PS2_STATUS_INPUT);
+}
+
+// Wait until the controller has a byte for us to read
+static void ps2_wait_read() {
+    while (!(inb(PS2_STATUS_REG) & PS2_STATUS_OUTPUT));
+}
+
+/* --- Initialization --- */
+
+void ps2_write_device(uint8_t command) {
+    ps2_wait_write();
+    outb(PS2_DATA_PORT, command);
+}
+
+void ps2_write_mouse(uint8_t data) {
+    ps2_wait_write();
+    outb(PS2_COMMAND_REG, PS2_CMD_WRITE_MOUSE); // "Next byte goes to mouse"
+    ps2_wait_write();
+    outb(PS2_DATA_PORT, data);
+}
+
+void ps2_init(void) {
+    // 1. Disable Devices
+    ps2_wait_write();
+    outb(PS2_COMMAND_REG, PS2_CMD_DISABLE_KB);
+    ps2_wait_write();
+    outb(PS2_COMMAND_REG, PS2_CMD_DISABLE_MS);
+
+    // 2. Flush Output Buffer
+    while (inb(PS2_STATUS_REG) & PS2_STATUS_OUTPUT) {
+        inb(PS2_DATA_PORT);
+    }
+
+    // 3. Set Controller Configuration Byte
+    // Bit 0: KB Interrupt, Bit 1: Mouse Interrupt, Bit 6: Translation
+    ps2_wait_write();
+    outb(PS2_COMMAND_REG, PS2_CMD_READ_CONFIG);
+    ps2_wait_read();
+    uint8_t status = inb(PS2_DATA_PORT);
+    status |= (1 << 0) | (1 << 1); // Enable IRQ 1 and IRQ 12
+    
+    ps2_wait_write();
+    outb(PS2_COMMAND_REG, PS2_CMD_WRITE_CONFIG);
+    ps2_wait_write();
+    outb(PS2_DATA_PORT, status);
+
+    // 4. Enable Devices
+    ps2_wait_write();
+    outb(PS2_COMMAND_REG, PS2_CMD_ENABLE_KB);
+    ps2_wait_write();
+    outb(PS2_COMMAND_REG, PS2_CMD_ENABLE_MS);
+
+    // 5. Initialize Mouse (The mouse won't send IRQs until you tell it to)
+    ps2_write_mouse(MOUSE_CMD_SET_DEFAULTS);
+    ps2_wait_read(); inb(PS2_DATA_PORT); // Read ACK (0xFA)
+    
+    ps2_write_mouse(MOUSE_CMD_ENABLE_SCAN);
+    ps2_wait_read(); inb(PS2_DATA_PORT); // Read ACK (0xFA)
+}
+
+/* --- IRQ Handlers --- */
+
+// Called from IRQ 1 (Keyboard)
+void ps2_keyboard_handler(void) {
+    uint8_t scancode = inb(PS2_DATA_PORT);
+    // Process scancode (e.g., put it into a circular buffer)
+}
+
+// Called from IRQ 12 (Mouse)
+static uint8_t mouse_cycle = 0;
+static uint8_t mouse_bytes[3];
+
+void ps2_mouse_handler(void) {
+    uint8_t status = inb(PS2_STATUS_REG);
+    
+    // Ensure this is actually mouse data
+    if (!(status & PS2_STATUS_MOUSE)) return;
+
+    mouse_bytes[mouse_cycle++] = inb(PS2_DATA_PORT);
+
+    if (mouse_cycle == 3) {
+        mouse_cycle = 0;
+        
+        // Byte 0: Flags (Buttons, Signs)
+        // Byte 1: X Delta
+        // Byte 2: Y Delta
+        
+        mouse_state_t state;
+        state.left_button   = (mouse_bytes[0] & 0x01);
+        state.right_button  = (mouse_bytes[0] & 0x02);
+        state.middle_button = (mouse_bytes[0] & 0x04);
+
+        // Handle negative deltas (signed 9-bit logic)
+        state.x_delta = (int8_t)mouse_bytes[1];
+        state.y_delta = (int8_t)mouse_bytes[2];
+
+        // Update your kernel's internal mouse position here
+    }
+}

kernel/ps2.h

@@ -0,0 +1,45 @@
+#ifndef PS2_H
+#define PS2_H
+
+#include <stdint.h>
+#include <stdbool.h>
+
+/* I/O Ports */
+#define PS2_DATA_PORT       0x60
+#define PS2_STATUS_REG      0x64
+#define PS2_COMMAND_REG     0x64
+
+/* Status Register Bits */
+#define PS2_STATUS_OUTPUT   0x01 // 1 = Data ready to be read
+#define PS2_STATUS_INPUT    0x02 // 1 = Controller busy, don't write yet
+#define PS2_STATUS_SYS      0x04 // System flag
+#define PS2_STATUS_CMD_DATA 0x08 // 0 = Data written to 0x60, 1 = Cmd to 0x64
+#define PS2_STATUS_MOUSE    0x20 // 1 = Mouse data, 0 = Keyboard data
+
+/* Controller Commands */
+#define PS2_CMD_READ_CONFIG  0x20
+#define PS2_CMD_WRITE_CONFIG 0x60
+#define PS2_CMD_DISABLE_MS   0xA7
+#define PS2_CMD_ENABLE_MS    0xA8
+#define PS2_CMD_DISABLE_KB   0xAD
+#define PS2_CMD_ENABLE_KB    0xAE
+#define PS2_CMD_WRITE_MOUSE  0xD4
+
+/* Mouse Commands */
+#define MOUSE_CMD_SET_DEFAULTS 0xF6
+#define MOUSE_CMD_ENABLE_SCAN  0xF4
+
+typedef struct {
+    int8_t  x_delta;
+    int8_t  y_delta;
+    bool    left_button;
+    bool    right_button;
+    bool    middle_button;
+} mouse_state_t;
+
+/* Public API */
+void ps2_init(void);
+void ps2_keyboard_handler(void);
+void ps2_mouse_handler(void);
+
+#endif