Changeset 95 for trunk/hal/tsar_mips32

Timestamp:

Jun 29, 2017, 1:40:15 PM (7 years ago)

Author:

alain

Message:

hal_special: replace hal_time_stamp() by hal_get_cycles()
hal_remote : remove hal_remove_unc()

Location:

trunk/hal/tsar_mips32/core

Files:

• hal_remote.c (modified) (1 diff)
• hal_special.c (modified) (1 diff)

trunk/hal/tsar_mips32/core/hal_remote.c

@@ -154 +154 @@
 }
 
-////////////////////////////////////////
-uint32_t hal_remote_lw_unc( xptr_t  xp )
-{
-        uint32_t data;
-    uint32_t ptr = (uint32_t)GET_PTR( xp );
-    uint32_t cxy = (uint32_t)GET_CXY( xp );
-
-    asm volatile( 
-        ".set noreorder              \n"
-        "mfc2   $15,    $24          \n"  /* $15 <= PADDR_EXT   */ 
-        "mtc2   %2,     $24          \n"  /* PADDR_EXT <= cxy   */   
-        "ll     %0,     0(%1)        \n"  /* data <= *paddr     */
-        "mtc2   $15,    $24          \n"  /* PADDR_EXT <= $15   */   
-        ".set reorder                \n"
-        : "=r" (data) : "r" (ptr), "r" (cxy) : "$15" );
-
-        return ( data );
-}
-
 ///////////////////////////////////////////
 bool_t hal_remote_atomic_cas( xptr_t    xp,

trunk/hal/tsar_mips32/core/hal_special.c

@@ -42 +42 @@
 
 /////////////////////////
-uint32_t hal_time_stamp()
-{
-        uint32_t cycles;
-  
-        asm volatile ("mfc0   %0,  $9  " : "=&r" (cycles));
-  
+uint64_t hal_get_cycles()
+{
+        uint64_t cycles;                // absolute time to be returned
+    uint32_t last_count;            // last registered cycles count
+    uint32_t current_count;         // current cycles count
+        uint32_t elapsed;
+
+    core_t * core = CURRENT_THREAD->core;
+
+    // get last registered time stamp
+        last_count = core->time_stamp;
+
+    // get current time stamp from hardware register
+        asm volatile ("mfc0   %0,  $9  " : "=&r" (current_count));
+
+        // compute number of elapsed cycles, taking into account 32 bits register wrap
+        if(current_count < last_count) elapsed = (0xFFFFFFFF - last_count) + current_count;
+        else                           elapsed = current_count - last_count;
+
+    // compute absolute time
+        cycles = core->cycles + elapsed;
+
+        // update core time
+        core->time_stamp = current_count;
+        core->cycles     = cycles;
+
+        hal_wbflush();
+
         return cycles;
 }