From 0a41dae5f406d498b5c9ab1542cb5660e0d982f6 Mon Sep 17 00:00:00 2001
From: Scott Gasch <scott.gasch@gmail.com>
Date: Wed, 1 Jun 2016 19:37:09 -0700
Subject: Initial checkin of toy OS project.

---
 kernel/hal/timestamp.asm | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 kernel/hal/timestamp.asm

(limited to 'kernel/hal/timestamp.asm')

diff --git a/kernel/hal/timestamp.asm b/kernel/hal/timestamp.asm
new file mode 100644
index 0000000..b56bedb
--- /dev/null
+++ b/kernel/hal/timestamp.asm
@@ -0,0 +1,19 @@
+
+        [BITS 32]
+
+GLOBAL HalReadTimestampCounter
+EXTERN g_ullTimeStampCounter        
+        
+[SECTION .text]
+;;;
+;;; ULONGLONG
+;;; HalReadTimestampCounter(void)
+;;; 
+;;; Function to read the processor's timestamp counter
+;;;
+HalReadTimestampCounter:
+        ALIGN 4
+        rdtsc
+        mov [g_ullTimeStampCounter], edx
+        mov [g_ullTimeStampCounter+4], eax
+        ret
-- 
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