From 9eeb9c863209492b02ff1d61c263dd2b2632a6a3 Mon Sep 17 00:00:00 2001
From: Edgaru089 <sjs333@outlook.com>
Date: Thu, 11 Nov 2021 01:49:27 +0800
Subject: [PATCH] smp: move thread_Yield to Assembly

---
 smp/kthread.c            |  5 -----
 smp/kthread_switch_asm.S | 13 +++++++++++++
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/smp/kthread.c b/smp/kthread.c
index d57e24e..4fbe075 100644
--- a/smp/kthread.c
+++ b/smp/kthread.c
@@ -85,11 +85,6 @@ int smp_thread_Nice(smp_thread_ID id, int newnice) {
 	return oldnice;
 }
 
-void smp_thread_Yield() {
-	__smp_PauseTicker = true;
-	asm volatile("int $0x28"); // TODO This is just quick and dirty to get into the scheduler
-}
-
 void smp_thread_Sleep(int ticks) {
 	INTERRUPT_DISABLE;
 	__smp_Current[0]->lastTick = __smp_Now + ticks;
diff --git a/smp/kthread_switch_asm.S b/smp/kthread_switch_asm.S
index e4b7820..09c6a2a 100644
--- a/smp/kthread_switch_asm.S
+++ b/smp/kthread_switch_asm.S
@@ -6,6 +6,7 @@ extrn  __smp_Now
 public __smp_IntSwitch_LastState
 public __smp_IntSwitch
 public __smp_Switch_Idle
+public smp_thread_Yield
 
 
 section '.bss' writable
@@ -27,6 +28,18 @@ __smp_IntSwitch_LastState:
 
 section '.text' executable
 
+; sysvx64abi smp_thread_Yield()
+;
+; Sets __smp_PauseTicker.
+; Pushes SS, RSP, RFLAGS, CS, RIP into the stack as Qwords,
+; like what the CPU does on execption,
+; and jumps to __smp_IntSwitch.
+smp_thread_Yield:
+	mov byte [__smp_PauseTicker], 1
+	int 0x28
+	ret
+
+
 ; interrupt_handler smp_IntSwitch()
 ;
 ; Called from a timer interrupt.