Changeset 849386a in mainline for arch/ia64/src

Timestamp:

2006-01-27T16:23:40Z (19 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

457d18a

Parents:

c2b95d3

Message:

First HT_HASH_ARCH implementation for ia64.

File:

• arch/ia64/src/mm/page.c (modified) (4 diffs)

arch/ia64/src/mm/page.c

@@ -39 +39 @@
 #include <arch/asm.h>
 #include <arch/barrier.h>
+#include <memstr.h>
 
 /** Initialize VHPT and region registers. */
@@ -67 +68 @@
         
                 rr.word == rr_read(i);
+                rr.map.ve = 0;          /* disable VHPT walker */
                 rr.map.rid = ASID_INVALID;
                 rr_write(i, rr.word);
@@ -77 +79 @@
          */
         page_ht = (pte_t *) frame_alloc(FRAME_KA, VHPT_WIDTH - FRAME_WIDTH, NULL);
-        ht_invalidate_all();
+        memsetb((__address) page_ht, VHPT_SIZE, 0);
+        ht_invalidate_all();    
         
         /*
@@ -99 +102 @@
         set_vhpt_environment();
 }
+
+/** Calculate address of collision chain from VPN and ASID.
+ *
+ * This is rather non-trivial function.
+ * First, it has to translate ASID to RID.
+ * This is achieved by taking VRN bits of
+ * page into account.
+ * Second, it must preserve the region register
+ * it writes the RID to.
+ *
+ * @param page Address of virtual page including VRN bits.
+ * @param asid Address space identifier.
+ *
+ * @return Head of VHPT collision chain for page and asid.
+ */
+pte_t *vhpt_hash(__address page, asid_t asid)
+{
+        region_register rr_save, rr;
+        pte_t *t;
+
+        rr_save.word = rr_read(VRN_WORK);
+        rr.word = rr_save.word;
+        if ((page >> VRN_SHIFT) != VRN_KERNEL)
+                rr.map.rid = (asid * RIDS_PER_ASID) + (page >> VRN_SHIFT);
+        else
+                rr.map.rid = ASID_KERNEL;
+        rr_write(VRN_WORK, rr.word);
+        srlz_i();
+        t = (pte_t *) thash((VRN_WORK << VRN_SHIFT) | (~(VRN_MASK) & page));
+        rr_write(VRN_WORK, rr_save.word);
+        srlz_i();
+        srlz_d();
+
+        return t;
+}