/**
* @fn kernel_main_loop
*
* @brief The heart of the RTOS, the main loop where the kernel is entered and exited.
*
* The complete function is:
*
* Loop
*<ol><li>Select and dispatch a process to run</li>
*<li>Exit the kernel (The loop is left and re-entered here.)</li>
*<li>Handle the request from the process that was running.</li>
*<li>End loop, go to 1.</li>
*</ol>
*/
void kernel_main_loop(void)
{
for(;;)
{
kernel_dispatch();
exit_kernel();
/* if this task makes a system call, or is interrupted,
* the thread of control will return to here. */
kernel_handle_request();
}
}
void asmlinkage sysenter_handler_entry(struct context *context)
{
ulong num = context->esi;
ulong param0 = context->edi;
ulong param1 = context->eax;
ulong param2 = context->edx;
ulong ret_addr = 0;
ulong ret_size = 0;
int succeed = 0;
int call_kernel = 1;
if (num == SYSCALL_PING) {
ret_addr = param0 + 1;
succeed = 1;
call_kernel = 0;
}
if (call_kernel) {
struct kernel_dispatch_info kdispatch;
kdispatch.context = context;
kdispatch.dispatch_type = kdisp_syscall;
kdispatch.syscall.num = num;
kdispatch.syscall.param0 = param0;
kdispatch.syscall.param1 = param1;
kdispatch.syscall.param2 = param2;
kernel_dispatch(&kdispatch);
//kprintf("Syscall from user!\n");
}
else {
// Prepare return value
context->eax = succeed;
context->esi = ret_addr;
context->edi = ret_size;
}
}
