X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fthreads%2Finit.c;h=cf7a896222a5e2370b8f03827fda4fbaf9c8d4c1;hb=e6e58461d3040e76e501a9dc9d4b38c5c825dc9c;hp=1135ae7ccecc79ad1593671c7e3bbd906c31caa1;hpb=2fb834e1f01b669851eee9e7a5598bc12df1e5ff;p=pintos-anon

diff --git a/src/threads/init.c b/src/threads/init.c
index 1135ae7..cf7a896 100644
--- a/src/threads/init.c
+++ b/src/threads/init.c
@@ -190,6 +190,10 @@ paging_init (void)
       pt[pte_idx] = pte_create_kernel (vaddr, true);
     }
 
+  /* Store the physical address of the page directory into CR3
+     aka PDBR (page directory base register).  This activates our
+     new page tables immediately.  See [IA32-v2a] "MOV--Move
+     to/from Control Registers" and [IA32-v3] 3.7.5. */
   asm volatile ("movl %0,%%cr3" :: "r" (vtop (base_page_dir)));
 }