From 5f6c2bcf0d2f9c416134aba224d90a605f216818 Mon Sep 17 00:00:00 2001
From: Miguel <m.i@gmx.at>
Date: Fri, 28 Sep 2018 11:13:06 +0200
Subject: struggling with scheduler and userprog to view ppm files

---
 kernel/interrupts.c |  4 ++++
 kernel/kernel.c     |  2 +-
 kernel/scheduler.c  | 30 +++++++++++++++++++++++++-----
 kernel/smp.c        |  3 +--
 4 files changed, 31 insertions(+), 8 deletions(-)

(limited to 'kernel')

diff --git a/kernel/interrupts.c b/kernel/interrupts.c
index 5a788c8..387b822 100644
--- a/kernel/interrupts.c
+++ b/kernel/interrupts.c
@@ -88,6 +88,10 @@ uint32_t interrupt_handler(uint32_t esp, uint32_t irq)
 	    break;
 
 	case INTERRUPT_APIC_TIMER: // frequency is configured in smp.c
+	    esp=scheduler_run(esp,-1);
+            apic_eoi(); 
+	    break;
+
 	case INTERRUPT_IPI:        // inter process interrupt
 	    esp=scheduler_run(esp,0);
             apic_eoi(); 
diff --git a/kernel/kernel.c b/kernel/kernel.c
index f926139..e7bef1d 100644
--- a/kernel/kernel.c
+++ b/kernel/kernel.c
@@ -62,7 +62,7 @@ void kernel_main(uint32_t eax,uint32_t ebx)
     // -- GET CONFIGS -- //
     klog("Read Multiboot Structures ...");
     multiboot_information *cfg_multiboot;
-    cfg_multiboot=multiboot_read(eax, ebx,true); // true for silent
+    cfg_multiboot=multiboot_read(eax, ebx,false); // true for silent
     // elf_multiboot_read(cfg_multiboot); // just show kernel section headers
     
     klog("Read Advanced Power Configuration Interface (ACPI) Structures ...");
diff --git a/kernel/scheduler.c b/kernel/scheduler.c
index 0c24f94..23ed7b2 100644
--- a/kernel/scheduler.c
+++ b/kernel/scheduler.c
@@ -120,8 +120,10 @@ static uint32_t scheduler_schedule(uint32_t idx)
 	if(task_list[cpu][idx].active && !task_list[cpu][idx].syscall)
 	{
             if(current_task[cpu]!=0)last_task[cpu]=current_task[cpu];
-
 	    current_task[cpu]=idx;
+            
+           // klog("%d idx %d",last_task[cpu],current_task[cpu]);
+
 	    install_tss(cpu,task_list[cpu][idx].esp0);
 	    x86_set_page_directory(task_list[cpu][idx].vmem);
 	    return task_list[cpu][idx].esp;
@@ -153,19 +155,36 @@ volatile uint32_t scheduler_run(uint32_t oldesp,uint32_t preference)
     else task_list[cpu][current_task[cpu]].esp=oldesp;
 
     uint32_t esp;
-    esp=scheduler_schedule(preference); // try preference
 
-    if(esp)return esp;
+    if(preference!=-1)
+    {
+        esp=scheduler_schedule(preference); // try preference
+        if(esp)return esp;
+
+        if(current_task[cpu]==0)// we have interrupted a task with ring1 work
+        {
+            esp=scheduler_schedule(last_task[cpu]); // try preference
+            if(esp)return esp;
+        }
+    }
+    else
+    {
+        //klog("preempt %d", last_task[cpu]);
+    }
 
     for(int i=0;i<MAX_TASKS;i++)
     {
 	int idx=(last_task[cpu]+1+i)%MAX_TASKS; // schedule round robin style
+        if(preference==-1&&idx==0)continue;
 
 	if(idx==preference||idx==2)continue;// skip sleeper and preferred tasks here.
 
 	esp=scheduler_schedule(idx);
 
-	if(esp)return esp;
+	if(esp){
+            //klog("%d",idx);
+            return esp;
+        }
     }
 
     // force the sleeper task...
@@ -349,9 +368,10 @@ void task_syscall_worker()
 	    task_list[cpu][0].syscall=true; // sleep (syscall misused)
 	}
 	x86_sti();
+
 	if(nowork)
 	{
-	    __asm__("int $0x81"); // wake scheduler!
+	    __asm__("int $0x81"); // wake scheduler! with IPI
 	}
     }
 }
diff --git a/kernel/smp.c b/kernel/smp.c
index e204b32..f23d15a 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -65,10 +65,9 @@ void run_smp()
     apic_enable();
     
     klog("Setup the LAPIC Timer on CPU with lapic_id=0x%x ...",apic_id());
-    apic_init_timer(2);// freq 2HZ
+    apic_init_timer(1);// freq x HZ
 
     klog("Enable Interrupts on CPU with lapic_id=0x%x ...",apic_id());
-
     asm_smp_unlock();
 
     smp_set(SMP_APIC_ID,apic_id());
-- 
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