Changeset 291 for trunk/modules/vci_mem_cache_v4/caba/metadata

Timestamp:

Jan 28, 2013, 1:59:32 PM (12 years ago)

Author:

joannou

Message:

Introducing new generic_llsc_local_table and generic_llsc_global_table components :
These two tables implement the new scalable LL/SC mechanism for TSAR.

• generic_llsc_local_table, integrated in the vci_cc_vache_wrapper_v4 component. The table is accessed by the DCACHE_FSM. A two step registration (LL cmd/ LL rsp) sets a signature allocated by the global table for the pending LL/SC operation. An SC operation consumes the registration.
• generic_llsc_global_table, integrated in the vci_mem_cache_v4 component. The table is accessed by the READ_FSM, WRITE_FSM, CAS_FSM, when accessing the directory. It generates a signature for LL registrations and performs SC operation by checking registration's valididty with that signature. SW operations simply invalidate a registrations.

N.B. :

• The sizes of the tables are parameters, and are NOT a function of the architecture's size (scalable mechanism).
• The LL are handled by the MEMCACHE in the READ_FSM.
• The SC are handled by the MEMCACHE in the WRITE_FSM, and are no longer CAS emulated. CAS operation is now only performed by hardware mechanisms.
• An extra field is added to the xram transaction table to save a pending LL's signature.

File:

• trunk/modules/vci_mem_cache_v4/caba/metadata/vci_mem_cache_v4.sd (modified) (1 diff)

trunk/modules/vci_mem_cache_v4/caba/metadata/vci_mem_cache_v4.sd

@@ -24 +24 @@
             Uses('common:mapping_table'),
             Uses('caba:generic_fifo'),
+            Uses('caba:generic_llsc_global_table'),
         ],