syscalls: start adding fork syscall, not done yet

src/tasking/syscalls.c

@@ -2,6 +2,8 @@
 #include <stddef.h>
 #include "../include/stdio.h"
 #include "../include/liballoc.h"
+#include "../include/paging.h"
+#include "../include/string.h"
 
 #define STDIN_FILENO 0
 #define STDOUT_FILENO 1
@@ -56,6 +58,23 @@ int sys_exit(TrapFrame *tf)
     return error_code;
 }
 
+int sys_fork(TrapFrame *tf)
+{
+    debug_log("FORKFORKFORKFORK\n");
+
+    uint32_t* new_pd = copy_page_dir(current->pagedir);
+
+    Process* child = task_create(0, 0, 3, new_pd);
+
+    memcpy(child, current, sizeof(Process));
+    memcpy(child->kstack, current->kstack, KSTACKSIZE);
+
+    child->tf->eax = 0;
+    tf->eax = child->pid;
+
+    return child->pid;
+}
+
 int sys_read(TrapFrame *tf)
 {
     if(tf->ebx < 3)
@@ -145,6 +164,7 @@ int sys_close(TrapFrame *tf)
 
 void handle_syscall(TrapFrame *tf)
 {
+    asm("cli");
     /*
     debug_log("EAX: %X ", tf->eax);
     debug_log("EBX: %X ", tf->ebx);
@@ -157,6 +177,12 @@ void handle_syscall(TrapFrame *tf)
         int r = sys_exit(tf);
         tf->eax = r;
     }
+
+    if(tf->eax == 2)
+    {
+        int r = sys_fork(tf);
+        tf->eax = r;
+    }
     
     if(tf->eax == 3)//read
     {
@@ -179,4 +205,5 @@ void handle_syscall(TrapFrame *tf)
         int r = sys_close(tf);
         tf->eax = r;
     }
+    asm("sti");
 }