Create pic.c

Implementation for pic.h

kernel/pic.h

@@ -0,0 +1,25 @@
+#ifndef PIC_H
+#define PIC_H
+
+#include <stdint.h>
+
+/* I/O Ports for the PICs */
+#define PIC1_COMMAND 0x20
+#define PIC1_DATA    0x21
+#define PIC2_COMMAND 0xA0
+#define PIC2_DATA    0xA1
+
+/* PIC Commands */
+#define PIC_EOI      0x20  /* End of Interrupt */
+
+/* Offset vectors for remapping */
+#define PIC1_OFFSET  0x20
+#define PIC2_OFFSET  0x28
+
+void pic_init(void);
+void pic_send_eoi(uint8_t irq);
+void pic_mask(uint8_t irq);
+void pic_unmask(uint8_t irq);
+void pic_disable(void);
+
+#endif

kernel/vfs.c

@@ -1,19 +0,0 @@
-#include "vfs.h"
-#include "kmalloc.h"
-#include "string_utils.h"
-
-vfs_node_t* vfs_root = NULL;
-
-uint32_t vfs_read(vfs_node_t* node, uint32_t offset, uint32_t size, uint8_t* buffer) {
-    if (node->read != NULL) {
-        return node->read(node, offset, size, buffer);
-    }
-    return 0;
-}
-
-vfs_node_t* vfs_finddir(vfs_node_t* node, const char* name) {
-    if ((node->flags & VFS_DIRECTORY) && node->finddir != NULL) {
-        return node->finddir(node, name);
-    }
-    return NULL;
-}

kernel/vfs.h

@@ -1,42 +0,0 @@
-#ifndef VFS_H
-#define VFS_H
-
-#include <stdint.h>
-#include <stddef.h>
-#include <stdbool.h>
-
-struct vfs_node;
-
-// Function pointers that every FS driver must provide
-typedef uint32_t (*vfs_read_func)(struct vfs_node*, uint32_t, uint32_t, uint8_t*);
-typedef struct vfs_node* (*vfs_finddir_func)(struct vfs_node*, const char* name);
-
-typedef struct vfs_node {
-    char name[128];
-    uint32_t mask;        // Permissions
-    uint32_t uid;         // User ID
-    uint32_t gid;         // Group ID
-    uint32_t flags;       // Node type (File, Directory, etc.)
-    uint32_t inode;       // FS-specific identifier
-    uint32_t length;      // Size in bytes
-    
-    // Function table
-    vfs_read_func    read;
-    vfs_finddir_func finddir;
-    
-    struct vfs_node* ptr; // Used for mountpoints or symlinks
-} vfs_node_t;
-
-// Standard node types
-#define VFS_FILE        0x01
-#define VFS_DIRECTORY   0x02
-#define VFS_MOUNTPOINT  0x04
-
-// The root of the filesystem (/)
-extern vfs_node_t* vfs_root;
-
-// Public API
-uint32_t vfs_read(vfs_node_t* node, uint32_t offset, uint32_t size, uint8_t* buffer);
-vfs_node_t* vfs_finddir(vfs_node_t* node, const char* name);
-
-#endif

pic.c

@@ -0,0 +1,76 @@
+#include "pic.h"
+#include "io.h"
+
+/* Small delay for older hardware bus timing */
+static inline void io_wait(void) {
+    outb(0x80, 0); 
+}
+
+void pic_init(void) {
+    uint8_t a1, a2;
+
+    // Save current masks
+    a1 = inb(PIC1_DATA);
+    a2 = inb(PIC2_DATA);
+
+    // ICW1: Start initialization in cascade mode
+    outb(PIC1_COMMAND, 0x11);
+    io_wait();
+    outb(PIC2_COMMAND, 0x11);
+    io_wait();
+
+    // ICW2: Master PIC vector offset
+    outb(PIC1_DATA, PIC1_OFFSET);
+    io_wait();
+    // ICW2: Slave PIC vector offset
+    outb(PIC2_DATA, PIC2_OFFSET);
+    io_wait();
+
+    // ICW3: Tell Master there is a slave at IRQ2 (0000 0100)
+    outb(PIC1_DATA, 4);
+    io_wait();
+    // ICW3: Tell Slave its cascade identity (0000 0010)
+    outb(PIC2_DATA, 2);
+    io_wait();
+
+    // ICW4: Set 8086/88 mode
+    outb(PIC1_DATA, 0x01);
+    io_wait();
+    outb(PIC2_DATA, 0x01);
+    io_wait();
+
+    // Restore masks (or disable all to start clean)
+    outb(PIC1_DATA, 0xFB); // Keep IRQ2 (cascade) open
+    outb(PIC2_DATA, 0xFF);
+}
+
+void pic_send_eoi(uint8_t irq) {
+    if (irq >= 8) {
+        outb(PIC2_COMMAND, PIC_EOI);
+    }
+    outb(PIC1_COMMAND, PIC_EOI);
+}
+
+void pic_unmask(uint8_t irq) {
+    uint16_t port;
+    if (irq < 8) {
+        port = PIC1_DATA;
+    } else {
+        port = PIC2_DATA;
+        irq -= 8;
+    }
+    uint8_t value = inb(port) & ~(1 << irq);
+    outb(port, value);
+}
+
+void pic_mask(uint8_t irq) {
+    uint16_t port;
+    if (irq < 8) {
+        port = PIC1_DATA;
+    } else {
+        port = PIC2_DATA;
+        irq -= 8;
+    }
+    uint8_t value = inb(port) | (1 << irq);
+    outb(port, value);
+}