From c459fab7662eaf45df9994c828065b9fc8d4a8ac Mon Sep 17 00:00:00 2001
From: Miguel <m.i@gmx.at>
Date: Sun, 2 Sep 2018 01:44:40 +0200
Subject: syscalls fine

---
 kernel/scheduler.c | 89 +++++++++++++++++++++++++++---------------------------
 1 file changed, 44 insertions(+), 45 deletions(-)

(limited to 'kernel/scheduler.c')

diff --git a/kernel/scheduler.c b/kernel/scheduler.c
index ee1cea2..a16dd02 100644
--- a/kernel/scheduler.c
+++ b/kernel/scheduler.c
@@ -92,6 +92,7 @@ void task_syscall_worker()
     {
 	//klog("checking if any pending syscalls.");
 
+	bool nowork=true;
 	for(int i=0;i<MAX_TASKS;i++)
 	{
 	    if(task_list[i].wait)
@@ -99,6 +100,24 @@ void task_syscall_worker()
     //	    klog("task %d waiting on syscall %d. processing...",i,task_list[i].eax);
 		task_list[2].vmem=task_list[i].vmem; // switch syscall worker to pagedir of calling userprog
 		x86_set_page_directory(task_list[2].vmem);
+
+		if(task_list[i].eax==SYSCALL_WAIT)
+		{
+		    continue;
+		}
+
+		if(task_list[i].eax==SYSCALL_READ)
+		{
+		uint32_t ok= chk_syscall_read(
+			    task_list[i].edx,
+			    task_list[i].ecx,
+			    task_list[i].ebx
+			    );
+		if(!ok)continue;
+		}
+
+		nowork=false;
+
 		uint32_t ret= syscall_generic(task_list[i].eax,
 			    task_list[i].edx,
 			    task_list[i].ecx,
@@ -113,8 +132,9 @@ void task_syscall_worker()
 	    }
 	}
 
-	task_list[2].wait=true;
-	__asm__("int $0x81"); // wake scheduler!
+	//task_list[2].wait=true;
+	if (nowork)__asm__("hlt");
+	else __asm__("int $0x81"); // wake scheduler!
     }
 }
 
@@ -128,7 +148,7 @@ void task_syscall_worker()
 //
 // we need to return a NEW stack pointer where popa will get the registers the new task requires
 //
-volatile uint32_t my_scheduler(uint32_t oldesp)
+volatile uint32_t my_scheduler(uint32_t oldesp,uint32_t force_pid)
 {
     // 
     static bool first=true;
@@ -136,6 +156,15 @@ volatile uint32_t my_scheduler(uint32_t oldesp)
     if(!first) task_list[current_task].esp=oldesp;
     first=false;
     //
+    if(force_pid>-1)
+    {
+	    int pid=force_pid;
+	    current_task=pid;
+	    install_tss(task_list[pid].esp0);
+
+	    x86_set_page_directory(task_list[pid].vmem);
+	    return task_list[pid].esp;
+    }
 
     for(int i=0;i<MAX_TASKS;i++)
     {
@@ -170,51 +199,21 @@ volatile uint32_t task_syscall(uint32_t eax,uint32_t ebx, uint32_t ecx, uint32_t
 
 //TODO: free vmem too!
 //TODO: notify waiting parent when child finished;
-volatile uint32_t task_exit(uint32_t oldesp)
+volatile uint32_t task_exit(uint32_t pid)
 { 
-    /*
-
-    task_list[current_task].active=false;
-    int parent_pid=task_list[current_task].parent;
-
-    klog("[%d] exit ", current_task);
-
-    if(task_list[parent_pid].active)
-    {
-	if(task_list[parent_pid].waiting)
-	{
-    
-	   klog("[%d] wake up", parent_pid);
-	   task_list[parent_pid].waiting=false;
-	}
-	else
-	{
-//	   klog("[%d] skipwait", parent_pid);
-//	   task_list[parent_pid].skipwait=true;
-	}
-	
-    }
-
-    vmem_free_dir(task_list[current_task].vmem);
-
-    return my_scheduler(oldesp);
-    */
-
+    task_list[pid].active=false;
+    int parent_pid=task_list[pid].parent;
+    if(task_list[parent_pid].wait&&task_list[parent_pid].eax==SYSCALL_WAIT)
+	    task_list[parent_pid].wait=false;
+    klog("[%d] exit", pid);
+    vmem_free_dir(task_list[pid].vmem);
 }
 
-volatile uint32_t task_wait(uint32_t oldesp)
-{ /*
-    klog("[%d] wait", current_task);
-    if(task_list[current_task].skipwait)
-    {
-	task_list[current_task].skipwait=false;
-    }
-    else
-    {
-	task_list[current_task].waiting=true;
-    }
-    return my_scheduler(oldesp);
-    */
+volatile uint32_t task_wait(uint32_t pid)
+{ 
+    klog("[%d] wait", pid);
+    task_list[pid].wait=true;
+    task_list[pid].eax=SYSCALL_WAIT;
 }
 
 volatile uint32_t task_fork(uint32_t pid)
-- 
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