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

2026-09-02 16:47:37 +03:00
commit 9cffb01889
47 changed files with 2432 additions and 0 deletions
@@ -0,0 +1,73 @@
+#pragma once
+
+#include "types.h"
+
+/* Syscall Numbers (passed in RAX) */
+#define SYS_IPC_CALL        1   /* Synchronous call: send message & wait for reply */
+#define SYS_IPC_REPLY_RECV  2   /* Server fast-path: reply to current and wait next */
+#define SYS_IPC_SEND        3   /* Asynchronous/non-blocking send */
+#define SYS_IPC_RECV        4   /* Block waiting for incoming message */
+#define SYS_MEM_MAP         5   /* Map memory / shared memory region */
+#define SYS_CAP_GRANT       6   /* Delegate capability to CNode */
+#define SYS_THREAD_YIELD    7   /* Yield CPU slice */
+#define SYS_THREAD_EXIT     8   /* Terminate current thread */
+#define SYS_LOG_DEBUG       9   /* Direct Ring 0 debug print */
+
+#ifndef __ASSEMBLER__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Low-level inline syscall invocations adhering to System V AMD64 ABI + Fast-Path */
+
+static inline sysret_t sys_ipc_call_raw(cap_t dest_cap, uint64_t msg_code,
+                                        uint64_t arg0, uint64_t arg1,
+                                        uint64_t arg2, uint64_t arg3,
+                                        uint64_t *out0, uint64_t *out1) {
+    register uint64_t rax __asm__("rax") = SYS_IPC_CALL;
+    register uint64_t rdi __asm__("rdi") = dest_cap;
+    register uint64_t rsi __asm__("rsi") = msg_code;
+    register uint64_t rdx __asm__("rdx") = arg0;
+    register uint64_t r8  __asm__("r8")  = arg1;
+    register uint64_t r9  __asm__("r9")  = arg2;
+    register uint64_t r10 __asm__("r10") = arg3;
+
+    __asm__ volatile(
+        "syscall"
+        : "+r"(rax), "+r"(rdx), "+r"(r8)
+        : "r"(rdi), "r"(rsi), "r"(r9), "r"(r10)
+        : "rcx", "r11", "memory"
+    );
+
+    if (out0) *out0 = rdx;
+    if (out1) *out1 = r8;
+    return (sysret_t)rax;
+}
+
+static inline sysret_t sys_yield(void) {
+    register uint64_t rax __asm__("rax") = SYS_THREAD_YIELD;
+    __asm__ volatile("syscall" : "+r"(rax) : : "rcx", "r11", "memory");
+    return (sysret_t)rax;
+}
+
+static inline void sys_exit(int code) {
+    register uint64_t rax __asm__("rax") = SYS_THREAD_EXIT;
+    register uint64_t rdi __asm__("rdi") = (uint64_t)code;
+    __asm__ volatile("syscall" : "+r"(rax) : "r"(rdi) : "rcx", "r11", "memory");
+    __builtin_unreachable();
+}
+
+static inline sysret_t sys_log_debug(const char *msg, size_t len) {
+    register uint64_t rax __asm__("rax") = SYS_LOG_DEBUG;
+    register uint64_t rdi __asm__("rdi") = (uint64_t)msg;
+    register uint64_t rsi __asm__("rsi") = (uint64_t)len;
+    __asm__ volatile("syscall" : "+r"(rax) : "r"(rdi), "r"(rsi) : "rcx", "r11", "memory");
+    return (sysret_t)rax;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ASSEMBLER__ */