hi,

there're ports whose cpu_startup does uvm_map_protect in order to
prevent COW on kernel text and NULL.
i don't see why they're needed.  iirc, these areas of kernel_map
should be reserved by uvm_km_init.  (assuming pmap_virtual_space, etc works.)
is there something special for these ports?  or can i just remove
these uvm_map_protect?

YAMAMOTO Takashi

kaeru% grep uvm_map_protect */*/machdep.c                           [/sys/arch]
atari/atari/machdep.c:  if (uvm_map_protect(kernel_map, 0, PAGE_SIZE, UVM_PROT_NONE, TRUE) != 0)
atari/atari/machdep.c:  if (uvm_map_protect(kernel_map, PAGE_SIZE, m68k_round_page(&etext),
cesfic/cesfic/machdep.c:        if (uvm_map_protect(kernel_map, KERNBASE, m68k_round_page(&etext),
hp300/hp300/machdep.c:  if (uvm_map_protect(kernel_map, 0, PAGE_SIZE, UVM_PROT_NONE, TRUE) != 0)
hp300/hp300/machdep.c:  if (uvm_map_protect(kernel_map, PAGE_SIZE, m68k_round_page(&etext),
luna68k/luna68k/machdep.c:      if (uvm_map_protect(kernel_map, 0, round_page((vaddr_t)&kernel_text),
luna68k/luna68k/machdep.c:      if (uvm_map_protect(kernel_map, trunc_page((vaddr_t)&kernel_text),
mac68k/mac68k/machdep.c:        if (uvm_map_protect(kernel_map,
mvme68k/mvme68k/machdep.c:      if (uvm_map_protect(kernel_map, 0, round_page((vaddr_t)&kernel_text),
mvme68k/mvme68k/machdep.c:      if (uvm_map_protect(kernel_map, trunc_page((vaddr_t)&kernel_text),
news68k/news68k/machdep.c:      if (uvm_map_protect(kernel_map, 0, m68k_round_page(&kernel_text),
news68k/news68k/machdep.c:      if (uvm_map_protect(kernel_map, m68k_trunc_page(&kernel_text),
next68k/next68k/machdep.c:      if (uvm_map_protect(kernel_map, 0, round_page((vaddr_t)&kernel_text),
next68k/next68k/machdep.c:      if (uvm_map_protect(kernel_map, trunc_page((vaddr_t)&kernel_text),
pc532/pc532/machdep.c:  if (uvm_map_protect(kernel_map,