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
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+/* opencoreC - Thread Context Switch */
+.global switch_to
+
+.section .text
+/*
+ * void switch_to(uint64_t **prev_rsp_ptr, uint64_t *next_rsp);
+ * RDI = pointer to current thread's stored RSP
+ * RSI = target thread's RSP
+ */
+switch_to:
+    /* Push callee-saved registers of outgoing thread */
+    push rbp
+    push rbx
+    push r12
+    push r13
+    push r14
+    push r15
+
+    /* Save current stack pointer */
+    mov [rdi], rsp
+
+    /* Load target stack pointer */
+    mov rsp, rsi
+
+    /* Pop callee-saved registers of incoming thread */
+    pop r15
+    pop r14
+    pop r13
+    pop r12
+    pop rbx
+    pop rbp
+
+    ret