lunaix-os/arch/i386/mm/vmutils.c

   1 #include <lunaix/mm/page.h>
   2 #include <sys/mm/mm_defs.h>
   3
   4 struct leaflet*
   5 dup_leaflet(struct leaflet* leaflet)
   6 {
   7     ptr_t dest_va, src_va;
   8     struct leaflet* new_leaflet;
   9
  10     new_leaflet = alloc_leaflet(leaflet_order(leaflet));
  11
  12     src_va = leaflet_mount(leaflet);
  13     dest_va = vmap(new_leaflet, KERNEL_DATA);
  14
  15     size_t cnt_wordsz = leaflet_size(new_leaflet) / sizeof(ptr_t);
  16
  17     asm volatile("movl %1, %%edi\n"
  18                  "movl %2, %%esi\n"
  19                  "rep movsl\n" ::"c"(cnt_wordsz),
  20                  "r"(dest_va),
  21                  "r"(src_va)
  22                  : "memory", "%edi", "%esi");
  23
  24     leaflet_unmount(leaflet);
  25     vunmap(dest_va, new_leaflet);
  26
  27     return new_leaflet;
  28 }