--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/gpf2/osl/os_pro_ir.c	Fri Jun 22 05:56:16 2018 +0000
@@ -0,0 +1,105 @@
+/*
+ * This C module is a reconstruction based on the disassembly of
+ * os_pro.obj in frame_na7_db_ir.lib from the Leonardo package.
+ */
+
+/* set of included headers from COFF symtab: */
+#include <stdio.h>
+#include <string.h>
+#include "gpfconf.h"	/* FreeCalypso addition */
+#include "../../nucleus/nucleus.h"
+#include "typedefs.h"
+#include "os.h"
+#include "gdi.h"
+#include "os_types.h"
+#include "os_glob.h"
+
+extern VOID *TCD_Current_Thread;
+extern T_OS_TASK_TABLE_ENTRY TaskTable[];
+extern unsigned os_time_to_tick_multiplier;
+
+#define	OS_NU_TASK_MAGIC	0xdeafbeef
+
+VOID
+os_TaskEntry(UNSIGNED TaskHandle, VOID *argv)
+{
+	TaskTable[TaskHandle].TaskEntry(TaskHandle, 0);
+}
+
+GLOBAL LONG
+os_SuspendTask(OS_HANDLE Caller, ULONG Time)
+{
+	UNSIGNED SuspendTicks;
+
+	SuspendTicks = TIME_TO_SYSTEM_TICKS(Time);
+	if (!SuspendTicks)
+		SuspendTicks = 1;
+	NU_Sleep(SuspendTicks);
+	return (OS_OK);
+}
+
+GLOBAL LONG
+os_ResumeTask(OS_HANDLE task_handle)
+{
+	if (NU_Resume_Task(&TaskTable[task_handle].TaskCB.TCB) == NU_SUCCESS)
+		return(OS_OK);
+	else
+		return(OS_ERROR);
+}
+
+GLOBAL LONG
+os_Relinquish(void)
+{
+	NU_Relinquish();
+	return(OS_OK);
+}
+
+GLOBAL OS_HANDLE
+os_MyHandle(void)
+{
+	OS_NU_TASK *os_nu_task = (OS_NU_TASK *) TCD_Current_Thread;
+
+	if (os_nu_task && os_nu_task->magic_nr == OS_NU_TASK_MAGIC)
+		return(os_nu_task->handle);
+	else
+		return(OS_NOTASK);
+}
+
+GLOBAL LONG
+os_GetTaskName(OS_HANDLE Caller, OS_HANDLE TaskHandle, char *Name)
+{
+	if (TaskHandle) {
+		if (TaskHandle > MaxTasks || !TaskTable[TaskHandle].Name[0])
+			return(OS_ERROR);
+		strcpy(Name, TaskTable[TaskHandle].Name);
+	} else if (TCD_Current_Thread) {
+		NU_TASK *curtask = TCD_Current_Thread;
+		strcpy(Name, curtask->tc_name);
+	} else
+		strcpy(Name, "ROOT");
+	return(OS_OK);
+}
+
+GLOBAL LONG
+os_DeferTask(OS_HANDLE task_handle, OS_TIME time)
+{
+	if (NU_Suspend_Task(&TaskTable[task_handle].TaskCB.TCB) == NU_SUCCESS)
+		return(OS_OK);
+	else
+		return(OS_ERROR);
+}
+
+GLOBAL LONG
+os_CheckTaskStack(OS_HANDLE Handle)
+{
+	register void *sp asm("sp");
+
+	if (*TaskTable[Handle].Stack != GUARD_PATTERN)
+		return(OS_ERROR);
+	if (TCD_Current_Thread) {
+		NU_TASK *curtask = TCD_Current_Thread;
+		if (sp < curtask->tc_stack_start)
+			return(OS_ERROR);
+	}
+	return(OS_OK);
+}