Changes between Version 11 and Version 12 of DsxDocumentation

Timestamp:

Jan 28, 2008, 7:25:53 PM (17 years ago)

Author:

alain

Comment:

--

DsxDocumentation

@@ -282 +282 @@
 }}}
  
-
-=== D4) Hardware architecture definition ===
-
-
-=== D5) Mapping table ===
-
-=== D6) Generic platforms ===
-
+=== D4) Generic platforms ===
+
+As DSX/L is based on PYTHON, it is possible to define generic, parametrized architectutes, that can
+be reused for various applications. Those reusable architectures are derived classes
+from the basic '''Architecture''' class. The implementation is defined in the architecture() method.
+
+As an example we define a parameterized multi-processors architecture, called MultiProc, and containing
+ a variable number of processors. The parameter(s) must be named, and the actual parameter value is defined when the architecture is instanciated. The parameter is referenced with the ''getParam()'' method:
+{{{
+##########################
+# generic architecture definition
+class MultiProc(Architecture) : 
+    defaults = { ’nbcpu’ : 2 }
+    def architecture(self): 
+
+    # segments definition
+    self.reset = Segment( ’reset’, address = 0xbfc00000, type = Cached ) 
+    self.code = Segment( ’code’, type = Cached )
+    self.data = Segment( ’data’, type = Uncached ) 
+
+    # components instanciation and connexion
+    self.vgmn = Vgmn( ’vgmn’ ) 
+    self.ram = MultiRam( ’ram’, self.reset, self.code, self.data ) 
+    # processors and caches
+    self.cpus = [] 
+    for i in self.getParam( ’nbcpu’ ): 
+        m = Mips( ’mips%d’%i ) 
+        self.cpus.append( m ) 
+        c = Xcache( ’cache%d’%i )
+        g:c.cache // m.cache ) 
+        c.vci // self.vgmn.getTarget() ) 
+    self.vgmn.getTarget() // self.c1 
+    self.vgmn.getTarget() // self.c2 
+    self.vgmn.getInit() // self.ram 
+
+    # base definition 
+    self.setBase( self.vgmn ) 
+
+    # segment table initialization
+    self.setConfig(’mapping_table’, MappingTable() ) 
+
+############################
+# generic architecture instanciation
+my_board = MultiProc( nbcpu = 4 )  
+}}} 
+ 
 == E)  Mapping the software on the hardware ==