terapage lookup

diff --git a/src/TLB/ariane/test/test_tlb_content.py b/src/TLB/ariane/test/test_tlb_content.py
index 0da2aff500d8873a4afd76333970631a510ad8d6..28960d134b8660e551447522c7a90f2058bb6f4e 100644 (file)
--- a/src/TLB/ariane/test/test_tlb_content.py
+++ b/src/TLB/ariane/test/test_tlb_content.py
@@ -5,17 +5,38 @@ sys.path.append("../../../TestUtil")
 from nmigen.compat.sim import run_simulation
 
 from TLB.ariane.tlb_content import TLBContent
 from nmigen.compat.sim import run_simulation
 
 from TLB.ariane.tlb_content import TLBContent

+from TestUtil.test_helper import assert_op, assert_eq

 
 

-def update():
-    yield dut.replace_en_i.eq(1)
-    
-def tbench(dut):
+def update(dut,a,t,g,m):

     yield dut.replace_en_i.eq(1)
     yield dut.update_i.valid.eq(1)
     yield dut.replace_en_i.eq(1)
     yield dut.update_i.valid.eq(1)

-    yield dut.update_i.is_512G.eq(1)
-    yield dut.update_i.vpn.eq(0xFFFFFFFF)
+    yield dut.update_i.is_512G.eq(t)
+    yield dut.update_i.is_1G.eq(g)
+    yield dut.update_i.is_2M.eq(m)
+    yield dut.update_i.vpn.eq(a)

     yield
     yield
     yield
     yield

+
+def check_hit(dut,hit,t):
+    hit_d = yield dut.lu_hit_o
+    assert_eq("hit", hit_d, hit)
+    t_d = yield dut.lu_is_512G_o
+    assert_eq("t", t_d, t)
+
+def addr(a,b,c,d):
+    return a | b << 9 | c << 18 | d << 27  
+    
+def tbench(dut):
+    yield dut.vpn0.eq(0xAA)
+    yield dut.vpn1.eq(0xBB)
+    yield dut.vpn2.eq(0xCC)
+    yield dut.vpn3.eq(0x0D)
+    yield from update(dut,addr(0x0A,0x0B,0x0C,0x0D),1,0,0)
+    yield from check_hit(dut,1,1)
+    yield from update(dut,addr(0x0A,0x0B,0x0C,0x0D),0,1,0)
+    yield from update(dut,addr(0x0A,0x0B,0x0C,0x0D),0,0,1)
+    
+    

     
 
 if __name__ == "__main__":
     
 
 if __name__ == "__main__":

diff --git a/src/TLB/ariane/tlb_content.py b/src/TLB/ariane/tlb_content.py
index 4010e3775e4a980f19beeb9cd55425f773c50a89..0e171e96c80d4a90fe153fee043184696a761648 100644 (file)
--- a/src/TLB/ariane/tlb_content.py
+++ b/src/TLB/ariane/tlb_content.py
@@ -52,26 +52,28 @@ class TLBContent(Elaboratable):
         m = Module()
 
         tags = TLBEntry(self.asid_width)
         m = Module()
 
         tags = TLBEntry(self.asid_width)

-        #TODO signal names, RecordObject
-        print("TAGS:")
-        #print(tags)

         
         
         content = Signal(self.pte_width)
 
         m.d.comb += [self.lu_hit_o.eq(0),
         
         
         content = Signal(self.pte_width)
 
         m.d.comb += [self.lu_hit_o.eq(0),

+                     self.lu_is_512G_o.eq(0),

                      self.lu_is_2M_o.eq(0),
                      self.lu_is_1G_o.eq(0)]
 
                      self.lu_is_2M_o.eq(0),
                      self.lu_is_1G_o.eq(0)]
 

-        # temporaries for 1st level match
+        # temporaries for all levels

         asid_ok = Signal(reset_less=True)
         asid_ok = Signal(reset_less=True)

-        vpn2_ok = Signal(reset_less=True)

         tags_ok = Signal(reset_less=True)
         tags_ok = Signal(reset_less=True)

-        vpn2_hit = Signal(reset_less=True)
+
+        vpn3_ok = Signal(reset_less=True)
+        vpn2_ok = Signal(reset_less=True)
+    
+        

         m.d.comb += [tags_ok.eq(tags.valid),
                      asid_ok.eq(tags.asid == self.lu_asid_i),
                      vpn2_ok.eq(tags.vpn2 == self.vpn2),
         m.d.comb += [tags_ok.eq(tags.valid),
                      asid_ok.eq(tags.asid == self.lu_asid_i),
                      vpn2_ok.eq(tags.vpn2 == self.vpn2),

-                     vpn2_hit.eq(tags_ok & asid_ok & vpn2_ok)]
+                     vpn3_ok.eq(tags.vpn3 == self.vpn3),
+                    ]

         # temporaries for 2nd level match
         vpn1_ok = Signal(reset_less=True)
         tags_2M = Signal(reset_less=True)
         # temporaries for 2nd level match
         vpn1_ok = Signal(reset_less=True)
         tags_2M = Signal(reset_less=True)


@@ -81,13 +83,17 @@ class TLBContent(Elaboratable):
                      tags_2M.eq(tags.is_2M),
                      vpn0_ok.eq(self.vpn0 == tags.vpn0),
                      vpn0_or_2M.eq(tags_2M | vpn0_ok)]
                      tags_2M.eq(tags.is_2M),
                      vpn0_ok.eq(self.vpn0 == tags.vpn0),
                      vpn0_or_2M.eq(tags_2M | vpn0_ok)]

-        # TODO temporaries for 3rd level match

         
         

-        # first level match, this may be a giga page,
-        # check the ASID flags as well
-        with m.If(vpn2_hit):
+        
+        with m.If(asid_ok & tags_ok):
+            # first level, only vpn3 needs to match
+            with m.If (tags.is_512G & vpn3_ok):
+                m.d.comb += [ self.lu_content_o.eq(content),
+                              self.lu_is_512G_o.eq(1),
+                              self.lu_hit_o.eq(1),
+                            ]

             # second level
             # second level

-            with m.If (tags.is_1G):
+            with m.Elif (tags.is_1G & vpn2_ok):

                 m.d.comb += [ self.lu_content_o.eq(content),
                               self.lu_is_1G_o.eq(1),
                               self.lu_hit_o.eq(1),
                 m.d.comb += [ self.lu_content_o.eq(content),
                               self.lu_is_1G_o.eq(1),
                               self.lu_hit_o.eq(1),