lunaix-os/arch/x86/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 #ifdef CONFIG_ARCH_X86_64
  18     asm volatile("movq %1, %%rdi\n"
  19                  "movq %2, %%rsi\n"
  20                  "rep movsq\n" ::"c"(cnt_wordsz),
  21                  "r"(dest_va),
  22                  "r"(src_va)
  23                  : "memory", "%edi", "%esi");
  24
  25 #else
  26     asm volatile("movl %1, %%edi\n"
  27                  "movl %2, %%esi\n"
  28                  "rep movsl\n" ::"c"(cnt_wordsz),
  29                  "r"(dest_va),
  30                  "r"(src_va)
  31                  : "memory", "%edi", "%esi");
  32
  33 #endif
  34
  35     leaflet_unmount(leaflet);
  36     vunmap(dest_va, new_leaflet);
  37
  38     return new_leaflet;
  39 }