first PID is 0, separate idle to system

code/kernel/ke_process.c

@@ -14,7 +14,8 @@
 // ---------------------------------------------------------------------------
 static LIST_ENTRY gProcessList;
 static SPINLOCK   gProcessListLock;
-static uint32_t   gNextProcessId = 1;
+static uint32_t   gNextProcessId = 0;
+static PROCESS*   gSystemProcess = (PROCESS*)0;
 
 static void KiProcessInit(void) {
     static int inited = 0;
@@ -38,6 +39,29 @@ PROCESS* KeGetCurrentProcess(void) {
     return NULL;
 }
 
+PROCESS* KeGetSystemProcess(void) {
+    return gSystemProcess;
+}
+
+KSTATUS KeCreateSystemProcess(PROCESS** out) {
+    if (!out) return STATUS_INVALID_PARAMETER;
+    if (gSystemProcess) {
+        *out = gSystemProcess;
+        return STATUS_SUCCESS;
+    }
+
+    PROCESS* proc = (PROCESS*)0;
+    KSTATUS s = KeCreateProcess("system", &proc);
+    if (!KSUCCESS(s)) {
+        *out = (PROCESS*)0;
+        return s;
+    }
+
+    gSystemProcess = proc;
+    *out = proc;
+    return STATUS_SUCCESS;
+}
+
 size_t KeCopyProcessIds(uint32_t* pidsOut, size_t maxCount) {
     KiProcessInit();
 
@@ -59,6 +83,9 @@ size_t KeCopyProcessIds(uint32_t* pidsOut, size_t maxCount) {
 static void KiProcessDestroy(OBJECT* obj) {
     PROCESS* proc = CONTAINING_RECORD(obj, PROCESS, Header);
 
+    if (proc == gSystemProcess)
+        gSystemProcess = (PROCESS*)0;
+
     // Release all remaining handles.
     for (int i = 1; i < HANDLE_TABLE_SIZE; i++) {
         if (proc->Handles[i]) {