add basic scheduler logic. rename init rootdir indexes

1 files changed, 19 insertions, 14 deletions

diff --git a/sys/syscall.c b/sys/syscall.c
index 05eeb58..0c40418 100644
--- a/sys/syscall.c
+++ b/sys/syscall.c
@@ -87,6 +87,7 @@ syscall_handler(uintmax_t message_path_raw, uint16_t message_pathlen)
 
     ctx.pcb = process_current();
     pcb_t *pcb = obj_deref(ctx.pcb);
+
     ctx.objdir = lockstack_push(&ctx.lockstack, obj_take(pcb_getrootdir(pcb)));
 
     ctx.message = link_try_traverse_objdir(
@@ -113,8 +114,8 @@ syscall_handler(uintmax_t message_path_raw, uint16_t message_pathlen)
         goto release_return;
     }
 
-    uintptr_t message_vptr = message_unmap(ctx.message.obj,
-            (jove_owned_obj_t*)pcb_getpagedir(pcb));
+    jove_owned_obj_t *pagedir = lockstack_push(&ctx.lockstack, pcb_getpagedir(ctx.objdir));
+    uintptr_t message_vptr = message_unmap(ctx.message.obj, pagedir);
 
     size_t messagelen = 0x1000;
     void *messagedata = (void*)message_getdata(ctx.message.obj);
@@ -135,27 +136,31 @@ syscall_handler(uintmax_t message_path_raw, uint16_t message_pathlen)
     ctx.target = link_try_traverse_objdir(
         ctx.objdir, &ctx.lockstack, ctx.header->pathlen, ctx.header->path);
 
-    if(ctx.target.obj != 0) {
-        sysret = _syscall_handle_switch(&ctx);
-    }else{
-        //Check if we're trying to reference the PCB. If we are, we should set it as the target
-        //regardless of lock.
-        if(ctx.header->pathlen == 1 &&
-            objdir_peeklocal(ctx.objdir, ctx.header->path[0]).data == ctx.pcb->locked.data)
-        {
-            ctx.target = (jove_perm_obj_t) { .permissions = 0xFF, .obj = ctx.pcb };
-            sysret = _syscall_handle_switch(&ctx);
-
+    if(ctx.target.obj == 0) {
+        //Check if we're trying to reference objects we've already locked in this function. 
+        //If we are, we should set it as the target regardless of lock, 
+        //since we're the ones with the lock already.
+        if(ctx.header->pathlen == 1) {
+            if(ctx.header->path[0] == PCB_ROOTDIR_SELF_I)
+                ctx.target = (jove_perm_obj_t) { .permissions = 0xFF, .obj = ctx.pcb };
+            else if(ctx.header->path[0] == PCB_ROOTDIR_PAGEDIR_I)
+                ctx.target = (jove_perm_obj_t) { .permissions = 0xFF, .obj = pagedir };
+            else
+                goto fail_target_busy;
         }else{
+fail_target_busy:
             //Could not find payload target in pcb rootdir.
             klogf("Process %i tried to call syscall with bad target path %P : %s\n", 
                     pcb_getpid(pcb), header->path, header->pathlen, errstr(errno));
             sysret = -errno;
+            goto remap_return;
         }
     }
 
+    sysret = _syscall_handle_switch(&ctx);
+
 remap_return:
-    message_remap(ctx.message.obj, (jove_owned_obj_t*)pcb_getpagedir(pcb), message_vptr);
+    message_remap(ctx.message.obj, pagedir, message_vptr);
 
 release_return:
     lockstack_popall(&ctx.lockstack);