feat: initial scalable x86_64 microkernel skeleton with Limine, Rust, C HAL, and C++20 IPC

hal/include/apic.h

@@ -0,0 +1,29 @@
+#pragma once
+
+#include "stdint.h"
+
+#define LAPIC_ID_REG         0x020
+#define LAPIC_VERSION_REG    0x030
+#define LAPIC_TPR_REG        0x080
+#define LAPIC_EOI_REG        0x0B0
+#define LAPIC_SVR_REG        0x0F0
+#define LAPIC_ICR_LOW_REG    0x300
+#define LAPIC_ICR_HIGH_REG   0x310
+#define LAPIC_LVT_TIMER_REG  0x320
+#define LAPIC_TIMER_INIT_REG 0x380
+#define LAPIC_TIMER_CURR_REG 0x390
+#define LAPIC_TIMER_DIV_REG  0x3E0
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void lapic_init(uintptr_t lapic_base_vaddr);
+void lapic_eoi(void);
+uint32_t lapic_read(uint32_t reg);
+void lapic_write(uint32_t reg, uint32_t value);
+uint32_t lapic_get_id(void);
+
+#ifdef __cplusplus
+}
+#endif

hal/include/pci.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include "stdint.h"
+
+#define PCI_CONFIG_ADDRESS 0xCF8
+#define PCI_CONFIG_DATA    0xCFC
+
+typedef struct pci_device {
+    uint8_t  bus;
+    uint8_t  slot;
+    uint8_t  func;
+    uint16_t vendor_id;
+    uint16_t device_id;
+    uint8_t  class_code;
+    uint8_t  subclass;
+    uint8_t  prog_if;
+    uint8_t  header_type;
+} pci_device_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+uint32_t pci_read_config_dword(uint8_t bus, uint8_t slot, uint8_t func, uint8_t offset);
+void     pci_write_config_dword(uint8_t bus, uint8_t slot, uint8_t func, uint8_t offset, uint32_t val);
+uint16_t pci_get_vendor_id(uint8_t bus, uint8_t slot, uint8_t func);
+uint16_t pci_get_device_id(uint8_t bus, uint8_t slot, uint8_t func);
+
+typedef void (*pci_scan_callback_t)(const pci_device_t *dev);
+void pci_scan_bus(pci_scan_callback_t callback);
+
+#ifdef __cplusplus
+}
+#endif

hal/include/uart.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "stdint.h"
+#include "stddef.h"
+
+#define UART_COM1_PORT 0x3F8
+#define UART_COM2_PORT 0x2F8
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Initialize 16550 UART port with target baud rate */
+int uart_init(uint16_t port, uint32_t baud);
+
+/* Check if transmit buffer is empty */
+int uart_is_tx_empty(uint16_t port);
+
+/* Transmit a single character */
+void uart_putc(uint16_t port, char c);
+
+/* Transmit a null-terminated string */
+void uart_puts(uint16_t port, const char *s);
+
+/* Transmit a buffer of given length */
+void uart_write(uint16_t port, const char *buf, size_t len);
+
+/* Check if data received */
+int uart_has_data(uint16_t port);
+
+/* Read a single character (blocking) */
+char uart_getc(uint16_t port);
+
+#ifdef __cplusplus
+}
+#endif