feat: Symmetric Multiprocessing, text editor improvements, merge doom libc, implement math functions

2026-03-23 20:09:11 +01:00
parent a805b06406
commit 63d9270613
46 changed files with 3004 additions and 2404 deletions
@@ -0,0 +1,64 @@
+/*
+    * SmpBoot.hpp
+    * Symmetric Multiprocessing bootstrap and per-CPU data
+    * Copyright (c) 2026 Daniel Hammer
+*/
+
+#pragma once
+#include <cstdint>
+#include <Hal/GDT.hpp>
+
+// ====================================================================
+// Assembly-visible offsets into CpuData
+// These MUST match the struct layout below. Verified by static_assert
+// in SmpBoot.cpp.
+// ====================================================================
+#define CPUDATA_SELF_PTR       0
+#define CPUDATA_KERNEL_RSP     8
+#define CPUDATA_USER_RSP       16
+#define CPUDATA_CURRENT_SLOT   24
+
+namespace Smp {
+
+    static constexpr int MaxCPUs = 64;
+
+    struct CpuData {
+        // === Fields accessed by assembly (offsets defined above) ===
+        uint64_t selfPtr;          // offset 0:  pointer to self
+        uint64_t kernelRsp;        // offset 8:  kernel stack top for SYSCALL
+        uint64_t userRspScratch;   // offset 16: scratch for saving user RSP
+        int32_t  currentSlot;      // offset 24: process table slot, -1 = idle
+        int32_t  _pad0;            // offset 28: padding
+
+        // === C++-only fields ===
+        int cpuIndex;              // 0-based CPU index
+        uint32_t lapicId;          // local APIC ID
+        uint64_t idleSavedRsp;     // RSP saved when switching from idle to process
+        volatile bool started;     // set by AP after init is complete
+
+        Hal::TSS64* tss;          // pointer to this CPU's TSS
+
+        // Per-CPU GDT and TSS (APs use these; BSP uses globals)
+        Hal::BasicGDT cpuGdt __attribute__((aligned(16)));
+        Hal::TSS64    cpuTss __attribute__((aligned(16)));
+    };
+
+    // Get the current CPU's data (reads gs:0 which holds the self-pointer)
+    inline CpuData* GetCurrentCpuData() {
+        CpuData* ptr;
+        asm volatile("mov %%gs:0, %0" : "=r"(ptr));
+        return ptr;
+    }
+
+    // Get CPU data by index
+    CpuData* GetCpuData(int index);
+
+    // Number of online CPUs
+    int GetCpuCount();
+
+    // Initialize BSP per-CPU data (call before interrupts are enabled)
+    void InitBsp();
+
+    // Boot all Application Processors (call after all subsystems ready)
+    void BootAPs();
+}