Merge branch 'master' of github.com:/avikivity/osv

* 'master' of github.com:/avikivity/osv: (28 commits)
  dlfcn: implement dlopen()
  elf: fail gracefully if a file is not found
  elf: return the elf_object just added from add()
  pthread: implement pthread_self()
  libc: implement sysconf(_SC_PHYS_PAGES)
  memory: count up total physical memory
  memory: set up free memory from the boot loader
  boot: set up cfi for premain environment
  boot: set up initial stack in allocated memory
  build: link in all .bss sections
  apic: add apic driver
  mutex: add with_lock() function
  scripts: run without SDL display
  main: auto-load gdb script
  sched: switch main thread stack from original stack
  main: add thread test case
  sched: add simple scheduler
  msr: add rdmsr()
  msr: add missing inline to wrmsr()
  elf: add accessor for tls segment info
  ...