Changeset 587 for trunk/hal/tsar_mips32/core/hal_vmm.c

Timestamp:

Nov 1, 2018, 12:39:27 PM (6 years ago)

Author:

alain

Message:

Modify the GPT (Generic Page Table) API to support remote accesses,
in order to improve page faults and COW handling.

File:

• trunk/hal/tsar_mips32/core/hal_vmm.c (modified) (6 diffs)

trunk/hal/tsar_mips32/core/hal_vmm.c

@@ -1 +1 @@
 /*
- * hal_vmm.c - Generic Virtual Memory Manager Initialisation for TSAR
+ * hal_vmm.c - Virtual Memory Manager Initialisation for TSAR
  *
  * Authors  Alain Greiner (2016,2017)
@@ -38 +38 @@
 // identity mapped. The following function is called by the generic vmm_init() function
 // and identity map all pages of the "kentry" vseg.
+// We dont take the locks protecting the VSL and the GPT, because there is no concurrent
+// accesses to VMM during VMM initialization.
 //////////////////////////////////////////////////////////////////////////////////////////
 
@@ -44 +46 @@
 {
     error_t error;
-
-    // get pointer on GPT
-    gpt_t * gpt = &vmm->gpt;
 
     // map all pages of "kentry" vseg
@@ -55 +54 @@
          vpn < (CONFIG_VMM_KENTRY_BASE + CONFIG_VMM_KENTRY_SIZE); vpn++ )
     {
-        error = hal_gpt_set_pte( gpt,
+        error = hal_gpt_set_pte( XPTR( local_cxy , &vmm->gpt ),
                                  vpn,
                                  attr,
@@ -62 +61 @@
         if( error ) return error;
     }
-
-    // get extended pointer on lock protecting the VSL
-    xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock );
-
-    // get VSL lock 
-    remote_rwlock_wr_acquire( lock_xp );
 
     // scan the VSL to found the "kentry" vseg
@@ -90 +83 @@
     }
 
-    // release the VSL lock
-    remote_rwlock_wr_release( lock_xp );
-
-    if( found == false ) return error;
+    if( found == false ) return 0XFFFFFFFF;
 
     return 0;