xv6: boot loader adjustments

do Bochs breakpoint and spin in bootasm.S.
not needed in bootmain too.
fix readseg bug (rounding of va).
zero segments when memsz > filesz.
no need to clear BSS in kernel main.
make bootother.S like bootasm.S

1 files changed, 0 insertions, 5 deletions

diff --git a/main.c b/main.c
index c93d9bf..fbad920 100644
--- a/main.c
+++ b/main.c
@@ -12,11 +12,6 @@ static void mpmain(void) __attribute__((noreturn));
 int
 main(void)
 {
-  extern char edata[], end[];
-
-  // clear BSS
-  memset(edata, 0, end - edata);
-
   mp_init(); // collect info about this machine
   lapic_init(mp_bcpu());
   cprintf("\ncpu%d: starting xv6\n\n", cpu());