Add memory, PCI, and timer modules to kernel

Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>

kernel/include/kernel/memory.h

@@ -0,0 +1,29 @@
+#ifndef METALOS_KERNEL_MEMORY_H
+#define METALOS_KERNEL_MEMORY_H
+
+#include <stdint.h>
+#include <stddef.h>
+#include "kernel/kernel.h"
+
+// Memory constants
+#define PAGE_SIZE 4096
+
+// Physical memory manager
+void pmm_init(BootInfo* boot_info);
+void* pmm_alloc_page(void);
+void pmm_free_page(void* page);
+uint64_t pmm_get_total_memory(void);
+uint64_t pmm_get_free_memory(void);
+
+// Simple kernel heap allocator (bump allocator for now)
+void heap_init(void* start, size_t size);
+void* kmalloc(size_t size);
+void* kcalloc(size_t num, size_t size);
+void kfree(void* ptr);
+
+// Memory utility functions
+void* memset(void* dest, int val, size_t count);
+void* memcpy(void* dest, const void* src, size_t count);
+int memcmp(const void* s1, const void* s2, size_t count);
+
+#endif // METALOS_KERNEL_MEMORY_H

kernel/include/kernel/pci.h

@@ -0,0 +1,31 @@
+#ifndef METALOS_KERNEL_PCI_H
+#define METALOS_KERNEL_PCI_H
+
+#include <stdint.h>
+
+// PCI Configuration Space Registers
+#define PCI_CONFIG_ADDRESS 0xCF8
+#define PCI_CONFIG_DATA    0xCFC
+
+// PCI Device Structure
+typedef struct {
+    uint8_t bus;
+    uint8_t device;
+    uint8_t function;
+    uint16_t vendor_id;
+    uint16_t device_id;
+    uint8_t class_code;
+    uint8_t subclass;
+    uint8_t prog_if;
+    uint8_t revision_id;
+    uint32_t bar[6];  // Base Address Registers
+} pci_device_t;
+
+// PCI Functions
+void pci_init(void);
+uint32_t pci_read_config(uint8_t bus, uint8_t device, uint8_t function, uint8_t offset);
+void pci_write_config(uint8_t bus, uint8_t device, uint8_t function, uint8_t offset, uint32_t value);
+pci_device_t* pci_find_device(uint16_t vendor_id, uint16_t device_id);
+void pci_enable_bus_mastering(pci_device_t* dev);
+
+#endif // METALOS_KERNEL_PCI_H

kernel/include/kernel/timer.h

@@ -0,0 +1,17 @@
+#ifndef METALOS_KERNEL_TIMER_H
+#define METALOS_KERNEL_TIMER_H
+
+#include <stdint.h>
+
+// Timer frequency (Hz)
+#define TIMER_FREQUENCY 1000  // 1ms per tick
+
+// Timer functions
+void timer_init(uint32_t frequency);
+uint64_t timer_get_ticks(void);
+void timer_wait(uint32_t ticks);
+
+// Timer interrupt handler (called from ISR)
+void timer_handler(void);
+
+#endif // METALOS_KERNEL_TIMER_H