WIP: modules

Kernel/Source/OS/Modules.c

@@ -0,0 +1,48 @@
+#include <OS/Modules.h>
+#include <OS/Scheduler.h>
+#include <OS/Log.h>
+#include <VM/Heap.h>
+#include <VM/VMM.h>
+#include <Lib/String.h>
+#include <Arch/CPU.h>
+#include "../Common/bootinfo.h"
+
+void ModuleLoad(BootModule* module) {
+    OSProcess* userProc = HeapAllocate(sizeof(OSProcess));
+    MemorySet(userProc, 0, sizeof(OSProcess));
+    userProc->id = 1; // TODO: id gen
+    userProc->state = OSTaskStateRunning;
+    StringCopy(userProc->name, module->name);
+
+    Address userL0Phys = (Address)PMMAllocatePage();
+    Address* userL0Virt = (Address*)VMPhysToHHDM(userL0Phys);
+    MemorySet(userL0Virt, 0, kVMPageSize);
+    userProc->l0Table = userL0Virt;
+
+    Address physBase = module->physicalBase;
+    Address virtBase = module->virtualBase;
+    Size modSize = module->size;
+
+    UInt64 codeFlags = kPTENormalMem | kPTEUser | kPTEAccessRW | kPTEPrivNX; // TODO: kill RWX
+
+    for (Size i = 0; i < modSize; i += kVMPageSize) {
+        VMMMapPage((Address*)userL0Phys, physBase + i, virtBase + i, codeFlags);
+    }
+
+    CPUCleanAndInvalidateCode((void*)VMPhysToHHDM(physBase), modSize);
+
+    Address stackPhys = (Address)PMMAllocatePage();
+    Address userStackVirt = 0x80000000;
+    UInt64 stackFlags = kPTENormalMem | kPTEUser | kPTEAccessRW | kPTEPrivNX | kPTEUserNX;
+
+    VMMMapPage((Address*)userL0Phys, stackPhys, userStackVirt, stackFlags);
+
+    void (*userEntryPoint)() = (void(*)())module->entry;
+
+    if ((Address)userEntryPoint == 0x0) {
+        OSLog("Skipping module %s: entry point is 0x0.\n", module->name);
+        return;
+    }
+
+    SchedulerSpawn(userEntryPoint, userProc, true, userStackVirt + kVMPageSize);
+}