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

   1 #include <lunaix/mm/vmm.h>
   2 #include <lunaix/mm/pmm.h>
   3 #include <sys/mm/mm_defs.h>
   4
   5 ptr_t
   6 vmm_dup_page(ptr_t pa)
   7 {
   8     ptr_t new_ppg = pmm_alloc_page(0);
   9     mount_page(PG_MOUNT_3, new_ppg);
  10     mount_page(PG_MOUNT_4, pa);
  11
  12     asm volatile("movl %1, %%edi\n"
  13                  "movl %2, %%esi\n"
  14                  "rep movsl\n" ::"c"(1024),
  15                  "r"(PG_MOUNT_3),
  16                  "r"(PG_MOUNT_4)
  17                  : "memory", "%edi", "%esi");
  18
  19     unmount_page(PG_MOUNT_3);
  20     unmount_page(PG_MOUNT_4);
  21
  22     return new_ppg;
  23 }