From a455cd5af26bf8731e7c981a9421b16ab34dae6f Mon Sep 17 00:00:00 2001
From: Miguel <m.i@gmx.at>
Date: Mon, 1 Oct 2018 23:22:03 +0200
Subject: fukkin scheduler

---
 asm/asm_x86.s | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'asm/asm_x86.s')

diff --git a/asm/asm_x86.s b/asm/asm_x86.s
index 3481ec2..7f0f56b 100644
--- a/asm/asm_x86.s
+++ b/asm/asm_x86.s
@@ -24,6 +24,9 @@
 .global x86_get_cr
 .global x86_set_cr
 
+// timer
+.global x86_rdtscp
+
 x86_outb:
     mov 4(%esp), %edx
     mov 8(%esp), %eax
@@ -132,3 +135,17 @@ x86_invlpg:
     mov 4(%esp), %eax // addr
     invlpg (%eax)
     ret
+
+#x86_rdtscp:
+#    rdtscp
+#    ret
+# https://stackoverflow.com/questions/12631856/difference-between-rdtscp-rdtsc-memory-and-cpuid-rdtsc
+x86_rdtscp:
+    lfence #intel
+    rdtsc
+    ret
+
+#x86_rdtscp:
+#    mfence #amd
+#    rdtsc
+#    ret
-- 
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