README.md

@@ -47,3 +47,4 @@ PepperOS wouldn't be possible without the following freely-licensed software:
 
 - the [OSDev](https://osdev.org) wiki & forums
 - Intel 64 and IA-32 Architectures Software Developer's Manual
+- Documentation for the [GNU Compiler Collection](https://gcc.gnu.org/onlinedocs/gcc/)

src/idt/idt.c

@@ -52,8 +52,7 @@ void idt_load(void* idt_addr)
 
 void idt_init()
 {
-    // We set 256 entries, but we have only the first few stubs.
-    // Undefined behavior?
+    // Hardcoded...
     for (size_t i=0; i<=33; i++)
     {
         // Each vector handler is 16-byte aligned, so <vector_no>*16 = address of that handler

src/kernel.h

@@ -23,8 +23,7 @@ enum ErrorCodes
 
 extern volatile uint64_t ticks;
 
-#define DEBUG(log, ...) fctprintf((void*)&skputc, 0, "[%8u] debug: [%s]: " log "\r\n", ticks, __FILE__, ##__VA_ARGS__)
-
+#define DEBUG(log, ...) fctprintf((void*)&skputc, 0, "[%8u] debug: <%s>: " log "\r\n", ticks, __func__, ##__VA_ARGS__)
 
 /* #define DEBUG(log, ...) \
 	printf("debug: [%s]: " log "\r\n", __FILE__, ##__VA_ARGS__); \

src/kmain.c

@@ -50,16 +50,24 @@ extern volatile struct limine_kernel_address_request kerneladdr_request;
 
 extern struct process_t* processes_list;
 extern struct process_t* current_process;
+struct process_t* idle_proc;
 
+bool iran = false;
+
+// Never gets executed although pedicel is scheduled?
 void pedicel_main(void* arg)
 {
+	bool iran = true;
 	// FROM THE NEXT LINE ONWARDS, CANNOT WRITE TO FRAMEBUFFER WITHOUT PAGE FAULT!
 	//printf("\n\nWelcome to PepperOS! Pedicel speaking.\nNothing left to do, halting the system!");
 }
 
 void idle_main(void* arg)
 {
-	for(;;)asm("hlt");
+	for (;;)
+	{
+		asm("hlt");
+	}
 }
 
 extern uintptr_t kheap_start;
@@ -94,17 +102,13 @@ void kmain()
 	idt_init();
 	
 	process_init();
-	struct process_t* idle_proc = process_create("idle", (void*)idle_main, 0);
+	idle_proc = process_create("idle", (void*)idle_main, 0);
 	struct process_t* pedicel = process_create("pedicel", (void*)pedicel_main, 0);
 
 	process_display_list(processes_list);
 
 	scheduler_init();
 
-	current_process = idle_proc; 
-    current_process->status = RUNNING;
-
 	kputs(PEPPEROS_SPLASH);
-	//panic(NULL, "Test panic");
 	idle();
 }

src/sched/process.c

@@ -45,7 +45,7 @@ void process_display_list(struct process_t* processes_list)
 
 struct process_t* process_create(char* name, void(*function)(void*), void* arg)
 {
-/*     CLEAR_INTERRUPTS; */
+    CLEAR_INTERRUPTS;
     struct process_t* proc = (struct process_t*)kmalloc(sizeof(struct process_t));
     
     struct cpu_status_t* ctx = (struct cpu_status_t*)kmalloc(sizeof(struct cpu_status_t));
@@ -79,7 +79,7 @@ struct process_t* process_create(char* name, void(*function)(void*), void* arg)
 
     process_add(&processes_list, proc);
 
-/*     SET_INTERRUPTS; */
+    SET_INTERRUPTS;
     return proc;
 }
 

src/sched/scheduler.c

@@ -12,6 +12,7 @@
 
 extern struct process_t* processes_list;
 extern struct process_t* current_process;
+extern struct process_t* idle_proc;
 
 void scheduler_init()
 {
@@ -28,9 +29,8 @@ struct cpu_status_t* scheduler_schedule(struct cpu_status_t* context)
 
     if (current_process == NULL)
     {
-        // Wtf happened
-        current_process = processes_list;
-        //panic(NULL, "Scheduler called without current process");
+        // If no more processes, then set IDLE as the current process, that's it.
+        current_process = idle_proc;
     }
 
     current_process->context = context;
@@ -49,15 +49,15 @@ struct cpu_status_t* scheduler_schedule(struct cpu_status_t* context)
         if (current_process != NULL && current_process->status == DEAD)
         {
             process_delete(&prev_process, current_process);
+            current_process = NULL;
+            return idle_proc->context;
         } else
         {
             current_process->status = RUNNING;
             break;
         }
     }
-    
 
-    // Current_process gets wrong context?? (iret_rip points to other stuff than process function; like putpixel() for example)
     DEBUG("current_process={pid=%u, name='%s', root_page_table[virt]=%p}", current_process->pid, current_process->name, current_process->root_page_table);
 
     load_cr3(VIRT_TO_PHYS((uint64_t)current_process->root_page_table));