Changeset 1025d28 in mainline for kernel/arch

Timestamp:

2008-11-13T07:54:48Z (17 years ago)

Author:

Jakub Vana <jakub.vana@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

37e518b

Parents:

aa8d0f7

Message:

IA64: Support for real frequency

Location:

kernel/arch/ia64

Files:

• include/bootinfo.h (modified) (1 diff)
• include/drivers/it.h (modified) (1 diff)
• src/drivers/it.c (modified) (2 diffs)

kernel/arch/ia64/include/bootinfo.h

@@ -49 +49 @@
 
         unsigned long * sapic;
+        unsigned long sys_freq;
+        unsigned long freq_scale;
         unsigned int wakeup_intno;
 

kernel/arch/ia64/include/drivers/it.h

@@ -42 +42 @@
  *
  */
-#define IT_DELTA        100000
+#define IT_DELTA        it_delta
 
 extern void it_init(void);

kernel/arch/ia64/src/drivers/it.c

@@ -47 +47 @@
 #define IT_SERVICE_CLOCKS 64
 
+#define FREQ_NUMERATOR_SHIFT 32
+#define FREQ_NUMERATOR_MASK 0xffffffff00000000LL
+
+#define FREQ_DENOMINATOR_SHIFT 0
+#define FREQ_DENOMINATOR_MASK 0xffffffffLL
+
+
+uint64_t it_delta;
+
+
 static irq_t it_irq;
 
@@ -65 +75 @@
                 it_irq.handler = it_interrupt;
                 irq_register(&it_irq);
+                
+                uint64_t base_freq;
+                base_freq  = ((bootinfo->freq_scale) & FREQ_NUMERATOR_MASK) >> FREQ_NUMERATOR_SHIFT;
+                base_freq *= bootinfo->sys_freq;
+                base_freq /= ((bootinfo->freq_scale) & FREQ_DENOMINATOR_MASK) >> FREQ_DENOMINATOR_SHIFT;
+                
+                it_delta = base_freq /HZ;
+                
         }