void nulluser(void)
{
/* Platform-specific initialization */
platforminit();
/* General initialization */
sysinit();
/* Enable interrupts */
enable();
/* Spawn the main thread */
ready(create(main, INITSTK, INITPRIO, "MAIN", 0), RESCHED_YES);
// kprintf("init done \n");
/* null thread has nothing else to do but cannot exit */
while (TRUE)
{
#ifndef DEBUG
pause();
#endif /* DEBUG */
// kprintf("null process \n");
}
}
/**
* Intializes the system and becomes the null thread.
* This is where the system begins after the C environment has been
* established. Interrupts are initially DISABLED, and must eventually
* be enabled explicitly. This routine turns itself into the null thread
* after initialization. Because the null thread must always remain ready
* to run, it cannot execute code that might cause it to be suspended, wait
* for a semaphore, or put to sleep, or exit. In particular, it must not
* do I/O unless it uses kprintf for synchronous output.
*/
int nulluser(void)
{
kprintf(VERSION);
kprintf("\r\r\n\n");
platforminit();
#ifdef DETAIL
/* Output detected platform. */
kprintf("Processor identification: 0x%08X\r\n", cpuid);
kprintf("Detected platform as: %s, %s\r\r\n\n",
platform.family, platform.name);
#endif
sysinit();
/* Output Xinu memory layout */
kprintf("%10d bytes physical memory.\r\n",
(ulong)platform.maxaddr & 0x7FFFFFFF);
#ifdef KSEG0_BASE
#ifdef DETAIL
kprintf(" [0x%08X to 0x%08X]\r\n",
(ulong)KSEG0_BASE, (ulong)(platform.maxaddr - 1));
#endif
kprintf("%10d bytes reserved system area.\r\n",
(ulong)_start - KSEG0_BASE);
#ifdef DETAIL
kprintf(" [0x%08X to 0x%08X]\r\n",
(ulong)KSEG0_BASE, (ulong)_start - 1);
#endif
#endif /* KSEG0_BASE */
kprintf("%10d bytes Xinu code.\r\n", (ulong)&_end - (ulong)_start);
#ifdef DETAIL
kprintf(" [0x%08X to 0x%08X]\r\n",
(ulong)_start, (ulong)&_end - 1);
#endif
kprintf("%10d bytes stack space.\r\n", (ulong)memheap - (ulong)&_end);
#ifdef DETAIL
kprintf(" [0x%08X to 0x%08X]\r\n",
(ulong)&_end, (ulong)memheap - 1);
#endif
kprintf("%10d bytes heap space.\r\n",
(ulong)platform.maxaddr - (ulong)memheap);
#ifdef DETAIL
kprintf(" [0x%08X to 0x%08X]\r\r\n\n",
(ulong)memheap, (ulong)platform.maxaddr - 1);
#endif
kprintf("\r\n");
#ifdef CONSOLE
open(CONSOLE, SERIAL0);
#endif /* CONSOLE */
/* enable interrupts here */
enable();
ready(create
((void *)main, INITSTK, INITPRIO, "MAIN", 2, 0,
NULL), RESCHED_YES);
while (TRUE)
{
#ifndef DEBUG
pause();
#endif /* DEBUG */
}
return OK;
}
/**
* Intializes the system and becomes the null process.
* This is where the system begins after the C environment has been
* established. Interrupts are initially DISABLED, and must eventually
* be enabled explicitly. This routine turns itself into the null process
* after initialization. Because the null process must always remain ready
* to run, it cannot execute code that might cause it to be suspended, wait
* for a semaphore, or put to sleep, or exit. In particular, it must not
* do I/O unless it uses kprintf for synchronous output.
*/
int nulluser()
{
kprintf(VERSION); kprintf("\r\n\r\n");
platforminit();
#ifdef DETAIL
/* Output detected platform. */
kprintf("Processor identification: 0x%08X\r\n", cpuid);
kprintf("Detected platform as: %s\r\n\r\n",platform.name);
#endif
sysinit();
/* Output XINU memory layout */
kprintf("%10d bytes physical memory.\r\n",
(ulong) platform.maxaddr & 0x7FFFFFFF );
#ifdef DETAIL
kprintf(" [0x%08X to 0x%08X]\r\n",
(ulong) KSEG0_BASE, (ulong) (platform.maxaddr - 1));
#endif
kprintf("%10d bytes reserved system area.\r\n",
(ulong) _start - KSEG0_BASE);
#ifdef DETAIL
kprintf(" [0x%08X to 0x%08X]\r\n",
(ulong) KSEG0_BASE, (ulong) _start - 1);
#endif
kprintf("%10d bytes XINU code.\r\n",
(ulong) &end - (ulong) _start);
#ifdef DETAIL
kprintf(" [0x%08X to 0x%08X]\r\n",
(ulong) _start, (ulong) &end - 1);
#endif
kprintf("%10d bytes stack space.\r\n",
(ulong) minheap - (ulong) &end);
#ifdef DETAIL
kprintf(" [0x%08X to 0x%08X]\r\n",
(ulong) &end, (ulong) minheap - 1);
#endif
kprintf("%10d bytes heap space.\r\n",
(ulong) platform.maxaddr - (ulong) minheap);
#ifdef DETAIL
kprintf(" [0x%08X to 0x%08X]\r\n\r\n",
(ulong) minheap, (ulong) platform.maxaddr - 1);
#endif
ready(create((void *)main, INITSTK, 1, "MAIN", 2, 0, NULL), 0);
/* enable interrupts here */
enable();
while(1)
{
if(nonempty(readylist))
resched();
/* If there are no processes left in the system, completed. */
if (numproc <= 1)
{
kprintf("\r\n\r\nAll user processes have completed.\r\n\r\n");
while (1)
;
}
}
}