Process linked list

Makefile

@@ -1,4 +1,4 @@
-SOURCES = src/mem/heap/kheap.c src/mem/paging/vmm.c src/mem/paging/paging.c src/mem/paging/pmm.c src/string/string.c src/io/kbd/ps2.c src/io/serial/serial.c src/io/term/printf.c src/io/term/term.c src/idt/idt.c src/mem/gdt/gdt.c src/mem/misc/utils.c src/time/timer.c src/kmain.c
+SOURCES = src/sched/scheduler.c src/sched/process.c src/mem/heap/kheap.c src/mem/paging/vmm.c src/mem/paging/paging.c src/mem/paging/pmm.c src/string/string.c src/io/kbd/ps2.c src/io/serial/serial.c src/io/term/printf.c src/io/term/term.c src/idt/idt.c src/mem/gdt/gdt.c src/mem/misc/utils.c src/time/timer.c src/kmain.c
 
 build:
 	rm -f *.o

src/idt/idt.c

@@ -5,6 +5,7 @@
 #include "io/kbd/ps2.h"
 #include <kernel.h>
 #include <stdbool.h>
+#include "sched/scheduler.h"
 
 struct interrupt_descriptor idt[256];
 struct idtr idt_reg;
@@ -187,6 +188,7 @@ struct cpu_status_t* interrupt_dispatch(struct cpu_status_t* context)
         case 32:
             //DEBUG("Timer Interrupt");
             ticks++;
+            scheduler_schedule();
             // Send an EOI so that we can continue having interrupts
             outb(0x20, 0x20);
             break;

src/kmain.c

@@ -14,6 +14,7 @@
 #include "mem/paging/paging.h"
 #include "mem/paging/vmm.h"
 #include "mem/heap/kheap.h"
+#include "sched/process.h"
 
 // Limine version used
 __attribute__((used, section(".limine_requests")))
@@ -76,6 +77,9 @@ const char* splash = "pepperOS version "PEPPEROS_VERSION_MAJOR"."PEPPEROS_VERSIO
 
 struct boot_context boot_ctx;
 
+extern struct process_t* processes_list;
+extern struct process_t* current_process;
+
 // This is our entry point
 void kmain()
 {
@@ -122,7 +126,11 @@ void kmain()
 	{
 		printf("testing, attention please %d\n", i);
 	}
-	// term_scroll(); 
+	
+	struct process_t* pedicel = process_create();
+
+	process_add(&processes_list, pedicel);
+	process_display_list(processes_list);
 
 	hcf();
 }

src/sched/process.c

@@ -0,0 +1,99 @@
+#include <stddef.h>
+#include "process.h"
+#include "mem/heap/kheap.h"
+#include "kernel.h"
+
+struct process_t* processes_list;
+struct process_t* current_process;
+
+void process_init()
+{
+    processes_list = NULL;
+    current_process = NULL;
+}
+
+// Only for debug
+void process_display_list(struct process_t* processes_list)
+{
+    int process_view_id = 0;
+    struct process_t* tmp = processes_list;
+    while (tmp != NULL)
+    {
+        DEBUG("{%d: } -> ", process_view_id);
+        tmp = tmp->next;
+        process_view_id++;
+    }
+    DEBUG("NULL");
+}
+
+struct process_t* process_create()
+{
+    struct process_t* proc = (struct process_t*)kmalloc(sizeof(struct process_t));
+    
+    if (!proc) return NULL;
+
+    proc->context = NULL;
+    proc->status = READY;
+    proc->next = NULL;
+
+    return proc;
+}
+
+void process_add(struct process_t** processes_list, struct process_t* process)
+{
+    if (!process) return;
+    process->next = NULL;
+
+    if (*processes_list == NULL)
+    {
+        // List is empty
+        *processes_list = process;
+        return;
+    }
+
+    struct process_t* tmp = *processes_list;
+    while (tmp->next != NULL)
+    {
+        tmp = tmp->next;
+    }
+    // We're at last process before NULL
+    tmp->next = process;
+    // process->next = NULL;
+}
+
+void process_delete(struct process_t** processes_list, struct process_t* process)
+{
+    if (!processes_list || !*processes_list || !process) return;
+
+    if (*processes_list == process)
+    {
+        // process to delete is at head
+        *processes_list = process->next;
+        process->next = NULL;
+        kfree(process);
+        return;
+    }
+
+    struct process_t* tmp = *processes_list;
+    while (tmp->next && tmp->next != process)
+    {
+        tmp = tmp->next;
+    }
+
+    if (tmp->next == NULL)
+    {
+        // Didn't find the process
+        return;
+    }
+
+    // We're at process before the one we want to delete
+    tmp->next = process->next;
+    process->next = NULL;
+    kfree(process);
+}
+
+struct process_t* process_get_next(struct process_t* process)
+{
+    if (!process) return NULL;
+    return process->next;
+}

src/sched/process.h

@@ -0,0 +1,26 @@
+#ifndef PROCESS_H
+#define PROCESS_H
+
+typedef enum 
+{
+    READY,
+    RUNNING,
+    DEAD
+} status_t;
+
+struct process_t
+{
+    status_t status;
+    struct cpu_status_t* context;
+    struct process_t* next;
+};
+
+void process_init();
+struct process_t* process_create();
+void process_add(struct process_t** processes_list, struct process_t* process);
+void process_delete(struct process_t** processes_list, struct process_t* process);
+struct process_t* process_get_next(struct process_t* process);
+
+void process_display_list(struct process_t* processes_list);
+
+#endif

src/sched/scheduler.c

@@ -0,0 +1,9 @@
+#include "kernel.h"
+
+extern struct process_t* processes_list;
+extern struct process_t* current_process;
+
+void scheduler_schedule()
+{
+    DEBUG("Scheduler called!");
+}

src/sched/scheduler.h

@@ -0,0 +1,6 @@
+#ifndef SCHEDULER_H
+#define SCHEDULER_H
+
+void scheduler_schedule();
+
+#endif

test.bin

@@ -0,0 +1 @@
+ｸ<EFBFBD>ｭﾞ<EFBFBD>