/* kernel entry point called at the end of the boot sequence */
void __boot() {
if (current_cpu_id() == 0) {
bootparams = physical_to_virtual(0x00000000);
console_init();
mem_init();
trap_init();
keyboard_init();
set_cpu_enable(0xFFFFFFFF);
network_init_pipeline();
network_start_receive();
set_cpu_enable(0xFFFFFFFF);
}
core_start(current_cpu_id());
while (1) ;
shutdown();
}
/* kernel entry point called at the end of the boot sequence */
void __boot() {
if (current_cpu_id() == 0) {
/* core 0 boots first, and does all of the initialization */
// boot parameters are on physical page 0
bootparams = physical_to_virtual(0x00000000);
// initialize console early, so output works
console_init();
// output should now work
printf("Welcome to my kernel!\n");
printf("Running on a %d-way multi-core machine\n", current_cpu_exists());
// initialize memory allocators
mem_init();
// prepare to handle interrupts, exceptions, etc.
trap_init();
// initialize keyboard late, since it isn't really used by anything else
keyboard_init();
// see which cores are already on
for (int i = 0; i < 32; i++)
printf("CPU[%d] is %s\n", i, (current_cpu_enable() & (1<<i)) ? "on" : "off");
// turn on all other cores
set_cpu_enable(0xFFFFFFFF);
// see which cores got turned on
busy_wait(0.1);
for (int i = 0; i < 32; i++)
printf("CPU[%d] is %s\n", i, (current_cpu_enable() & (1<<i)) ? "on" : "off");
} else {
/* remaining cores boot after core 0 turns them on */
// nothing to initialize here...
}
printf("Core %d of %d is alive!\n", current_cpu_id(), current_cpu_exists());
busy_wait(current_cpu_id() * 0.1); // wait a while so messages from different cores don't get so mixed up
int size = 64 * 1024 * 4;
printf("about to do calloc(%d, 1)\n", size);
unsigned int t0 = current_cpu_cycles();
calloc(size, 1);
unsigned int t1 = current_cpu_cycles();
printf("DONE (%u cycles)!\n", t1 - t0);
while (1) ;
for (int i = 1; i < 30; i++) {
int size = 1 << i;
printf("about to do calloc(%d, 1)\n", size);
calloc(size, 1);
}
while (1) {
printf("Core %d is still running...\n", current_cpu_id());
busy_wait(4.0); // wait 4 seconds
}
shutdown();
}
