[Qemu-commits] [COMMIT 8b88495] sparc64 support TSB related MMU registers

[Anthony Liguori]

From: Igor Kovalenko <address@hidden>

Posting updated patch to the list...

>>> On Fri, Apr 24, 2009 at 9:42 PM, Blue Swirl <address@hidden> wrote:
>>> Â >
>>> Â > Nice, though I didn't notice any visible improvement in my tests.
>>>
>>> This early in boot process there is not much to output; and I test
>>> Â recent kernel which may use different startup sequence.
>>> Â I modified openbios cif handler to output arguments and I now can see
>>> Â visible difference.
>>>
>>>
>>> Â >
>>> Â > About the patch, there are a few problems:
>>> Â > - it breaks Sparc32
>>>
>>> You mean it stops working?
>>
>> Does not even build.

Fixed now.

>>> Â > - commented out code is ugly
>>> Â > - if and else should be on the same line as '{' or '}'
>>> Â > - long lines should be wrapped
>>> Â > - in the line:
>>> Â > + Â  Â return (((tag_access_register & 
>>> 0x1fff)<<48)|(tag_access_register >> 22));
>>> Â > Â there should be white space between ) and << and 48.
>>> Â >
>>>

>>
>> Also the ")|(" in between is crowded.
>>
>> Maybe the coding style does not describe this well enough.

BTW Supplying indent template would be great.

Please see the updated patch qemu-sparc64-tsb-asi-2.patch attached.

--
Kind regards,
Igor V. Kovalenko

diff --git a/target-sparc/op_helper.c b/target-sparc/op_helper.c
index 947a55a..b434593 100644
--- a/target-sparc/op_helper.c
+++ b/target-sparc/op_helper.c
@@ -39,6 +39,56 @@ do { printf("ASI: " fmt , ##args); } while (0)
 #endif
 #endif
 
+#ifdef TARGET_SPARC64
+// Calculates TSB pointer value for fault page size 8k or 64k
+static uint64_t ultrasparc_tsb_pointer(uint64_t tsb_register,
+                                       uint64_t tag_access_register,
+                                       int page_size)
+{
+    uint64_t tsb_base = tsb_register & ~0x1fffULL;
+    int tsb_split = (env->dmmuregs[5] & 0x1000ULL) ? 1 : 0;
+    int tsb_size  = env->dmmuregs[5] & 0xf;
+
+    // discard lower 13 bits which hold tag access context
+    uint64_t tag_access_va = tag_access_register & ~0x1fffULL;
+
+    // now reorder bits
+    uint64_t tsb_base_mask = ~0x1fffULL;
+    uint64_t va = tag_access_va;
+
+    // move va bits to correct position
+    if (page_size == 8*1024) {
+        va >>= 9;
+    } else if (page_size == 64*1024) {
+        va >>= 12;
+    }
+
+    if (tsb_size) {
+        tsb_base_mask <<= tsb_size;
+    }
+
+    // calculate tsb_base mask and adjust va if split is in use
+    if (tsb_split) {
+        if (page_size == 8*1024) {
+            va &= ~(1ULL << (13 + tsb_size));
+        } else if (page_size == 64*1024) {
+            va |= (1ULL << (13 + tsb_size));
+        }
+        tsb_base_mask <<= 1;
+    }
+
+    return ((tsb_base & tsb_base_mask) | (va & ~tsb_base_mask)) & ~0xfULL;
+}
+
+// Calculates tag target register value by reordering bits
+// in tag access register
+static uint64_t ultrasparc_tag_target(uint64_t tag_access_register)
+{
+    return ((tag_access_register & 0x1fff) << 48) | (tag_access_register >> 
22);
+}
+
+#endif
+
 static inline void address_mask(CPUState *env1, target_ulong *addr)
 {
 #ifdef TARGET_SPARC64
@@ -1652,13 +1702,31 @@ uint64_t helper_ld_asi(target_ulong addr, int asi, int 
size, int sign)
         {
             int reg = (addr >> 3) & 0xf;
 
-            ret = env->immuregs[reg];
+            if (reg == 0) {
+                // I-TSB Tag Target register
+                ret = ultrasparc_tag_target(env->immuregs[6]);
+            } else {
+                ret = env->immuregs[reg];
+            }
+
             break;
         }
     case 0x51: // I-MMU 8k TSB pointer
+        {
+            // env->immuregs[5] holds I-MMU TSB register value
+            // env->immuregs[6] holds I-MMU Tag Access register value
+            ret = ultrasparc_tsb_pointer(env->immuregs[5], env->immuregs[6],
+                                         8*1024);
+            break;
+        }
     case 0x52: // I-MMU 64k TSB pointer
-        // XXX
-        break;
+        {
+            // env->immuregs[5] holds I-MMU TSB register value
+            // env->immuregs[6] holds I-MMU Tag Access register value
+            ret = ultrasparc_tsb_pointer(env->immuregs[5], env->immuregs[6],
+                                         64*1024);
+            break;
+        }
     case 0x55: // I-MMU data access
         {
             int reg = (addr >> 3) & 0x3f;
@@ -1677,7 +1745,28 @@ uint64_t helper_ld_asi(target_ulong addr, int asi, int 
size, int sign)
         {
             int reg = (addr >> 3) & 0xf;
 
-            ret = env->dmmuregs[reg];
+            if (reg == 0) {
+                // D-TSB Tag Target register
+                ret = ultrasparc_tag_target(env->dmmuregs[6]);
+            } else {
+                ret = env->dmmuregs[reg];
+            }
+            break;
+        }
+    case 0x59: // D-MMU 8k TSB pointer
+        {
+            // env->dmmuregs[5] holds D-MMU TSB register value
+            // env->dmmuregs[6] holds D-MMU Tag Access register value
+            ret = ultrasparc_tsb_pointer(env->dmmuregs[5], env->dmmuregs[6],
+                                         8*1024);
+            break;
+        }
+    case 0x5a: // D-MMU 64k TSB pointer
+        {
+            // env->dmmuregs[5] holds D-MMU TSB register value
+            // env->dmmuregs[6] holds D-MMU Tag Access register value
+            ret = ultrasparc_tsb_pointer(env->dmmuregs[5], env->dmmuregs[6],
+                                         64*1024);
             break;
         }
     case 0x5d: // D-MMU data access
@@ -1707,8 +1796,6 @@ uint64_t helper_ld_asi(target_ulong addr, int asi, int 
size, int sign)
     case 0x76: // E-cache tag
     case 0x7e: // E-cache tag
         break;
-    case 0x59: // D-MMU 8k TSB pointer
-    case 0x5a: // D-MMU 64k TSB pointer
     case 0x5b: // D-MMU data pointer
     case 0x48: // Interrupt dispatch, RO
     case 0x49: // Interrupt data receive