major restructuring, prepare for smp

code/user/system/init/init.c

@@ -0,0 +1,96 @@
+// init.c - first user-mode process
+#include <stdint.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <ntlite/syscall.h>
+
+#define STATUS_SUCCESS 0u
+
+void itoa(int num, char* str) {
+    int i = 0;
+    int is_negative = 0;
+
+    // Handle 0 explicitly
+    if (num == 0) {
+        str[i++] = '0';
+        str[i] = '\0';
+        return;
+    }
+
+    // Handle negative numbers
+    if (num < 0) {
+        is_negative = 1;
+        num = -num;
+    }
+
+    // Process individual digits (result is in reverse)
+    while (num != 0) {
+        int rem = num % 10;
+        str[i++] = rem + '0';
+        num = num / 10;
+    }
+
+    if (is_negative) {
+        str[i++] = '-';
+    }
+
+    str[i] = '\0'; // Null terminate
+
+    // Reverse the string
+    int start = 0;
+    int end = i - 1;
+    while (start < end) {
+        char temp = str[start];
+        str[start] = str[end];
+        str[end] = temp;
+        start++;
+        end--;
+    }
+}
+
+static void debug_print(const char* s) {
+    SYS_DEBUG_PRINT_REQUEST req = { SysSvFromCstr(s) };
+    (void)SysDebugPrint(&req);
+}
+
+void _start(void)
+{
+    SYS_STRING_VIEW args = SysGetPeb()->CommandLine;
+    uint32_t h = 0;
+    uint32_t s = 0;
+
+    while (true) {
+        debug_print("[init] starting\n");
+        SYS_CREATE_PROCESS_REQUEST cp = { args, SysSvFromParts(0, 0), &h };
+        s = SysCreateProcess(&cp);
+        if (s != STATUS_SUCCESS) {
+            debug_print("[init] FATAL: failed to start!\n");
+            char buffer[12];
+            itoa(s, buffer);
+            debug_print(buffer);
+            debug_print("\n");
+            SysExitProcess(1);
+        }
+
+        debug_print("[init] waiting\n");
+        s = SysWaitForProcess(h);
+        if (s != STATUS_SUCCESS)
+            debug_print("[init] WARNING: SysWaitForProcess returned error\n");
+
+        int exitCode = 0;
+        if (SysGetProcessExitCode(h, &exitCode) != STATUS_SUCCESS) {
+            debug_print("[init] WARNING: failed to read exit code\n");
+            exitCode = 1;
+        }
+
+        SysCloseHandle(h);
+
+        if (exitCode == 0)
+            break;
+
+        debug_print("[init] child crashed, restarting\n");
+    }
+
+    debug_print("[init] done\n");
+    SysExitProcess(0);
+}