========================================
  frostbyte kernel  x86_64  long mode
  wave 2: userspace, ring 3, syscalls
========================================

[boot] multiboot2 magic verified (36d76289)
[gdt]  kernel + user segments, tss slot reserved
[idt]  256 vectors (32 exceptions, 16 irqs, int 0x80 syscall)
[pic]  remapped to 0x20-0x2f, irq0 and irq1 unmasked
[pmm]  130559 KiB usable, 32736 frames, 32439 free after kernel
[heap] free-list allocator at 0x0000000000129000, 8192 KiB
[heap] free-list allocator self-test:
[heap]   alloc a=0x0000000000129020 b=0x00000000001290b0 c=0x00000000001291a0, live blocks=4
[heap]   free(b) then malloc(150) -> d=0x00000000001290b0, reused b: yes
[heap]   largest free 8191 KiB -> 8191 KiB after freeing a,c,d
[heap]   coalesce PASS, 8191 KiB free of 8192 KiB, blocks=1
[paging] mapped 0x00000000c0000000 -> phys 929000, readback OK
[pit]  timer at 100 Hz
[kbd]  ps/2 keyboard driver ready
[tss]  loaded, rsp0 bootstrap stack installed
[initrd] fbar mounted, 3 files
[initrd] module at 0x0000000000123000-0x0000000000127638 (17 KiB)

[boot] launching userland programs from initrd into ring 3
[user] loaded 'hello' pid=4 entry=0x00000000400000b7 stackTop=0x0000000048000000 (5720 bytes)
[user] loaded 'counter' pid=5 entry=0x00000000500000f2 stackTop=0x0000000058000000 (5880 bytes)
[user] loaded 'sbrktest' pid=6 entry=0x0000000060000149 stackTop=0x0000000068000000 (6232 bytes)
[sched] 7 threads total (idle, shell, 2 workers, user programs)

[boot] enabling interrupts, starting preemptive scheduler


frostbyte shell ready. type 'help'.
frostbyte> hello: greetings from ring 3, pid=4
counter: pid=5 step=0
sbrktest: pid=6 requesting 8192 bytes via sbrk
sbrktest: heap page write and read-back verified OK
[user] pid=6 'sbrktest' exited with code 0
hello: resumed after yield, exiting cleanly
[user] pid=4 'hello' exited with code 7
counter: pid=5 step=1
counter: pid=5 step=2
counter: pid=5 step=3
counter: pid=5 step=4
counter: finished counting
[user] pid=5 'counter' exited with code 0
[workerA] tick=50 iterations=9283703
[workerB] tick=91 iterations=17208332
[workerA] tick=150 iterations=28254555
[workerB] tick=191 iterations=36253847
[workerA] tick=250 iterations=46306517
[workerB] tick=291 iterations=52985378
[workerA] tick=350 iterations=61196592
[workerB] tick=391 iterations=70967282
[workerA] tick=450 iterations=79949479
[workerB] tick=491 iterations=90111106
[workerA] tick=550 iterations=98996653
qemu-system-x86_64: terminating on signal 15 from pid 956094 (timeout)