unmap message object used for syscalls

1 files changed, 46 insertions, 7 deletions

diff --git a/sys/message.c b/sys/message.c
index 7c871ce..c87487b 100644
--- a/sys/message.c
+++ b/sys/message.c
@@ -1,15 +1,54 @@
 #include "message.h"
+#include "api/error.h"
+#include "errno.h"
+#include "hal/memory.h"
 #include "hal/obj.h"
+#include "lib/printf.h"
 
-void *
-message_data(jove_owned_obj_t *obj)
+int
+message_hasmap(jove_owned_obj_t *obj)
 {
-    uintptr_t objptr = (uintptr_t)obj_deref(obj);
-    return (void*)(objptr & ~0xFFF);
+    return obj_getvalue(obj) & 1;
 }
 
-size_t 
-message_len(jove_owned_obj_t *obj)
+uintptr_t
+message_unmap(jove_owned_obj_t *obj, jove_owned_obj_t *pagedir)
 {
-    return (obj_getvalue(obj) & 0xFFF) << 12;
+    if(message_hasmap(obj) == 0) {
+        kprintf("Message %p doesn't have a map\n", obj_getvalue(obj));
+        return -ENOMAP;
+    }
+    uintptr_t vptr = obj->locked.value & ~0xFFFULL;
+    uintptr_t *mapping = pagedir_get_mapping(pagedir, vptr);
+
+    pagedir_mapping_set_present(mapping, false);
+    pagedir_invlpg(vptr);
+
+    obj_setvalue(obj, *mapping);
+    return vptr;
+}
+
+void 
+message_remap(jove_owned_obj_t *message, jove_owned_obj_t *pagedir, uintptr_t vptr)
+{
+    if(message_hasmap(message)) {
+        errno = -EHASMAP;
+        return;
+    }
+
+    uintmax_t *mapping = pagedir_get_mapping(pagedir, vptr);
+
+    *mapping = obj_getvalue(message) | 1;
+    pagedir_invlpg(vptr);
+
+    obj_setvalue(message, vptr | 1);
+}
+
+uintptr_t message_getdata(jove_owned_obj_t *message)
+{
+    if(message_hasmap(message))
+        return obj_getvalue(message) & ~0xFFFULL;
+
+    uintptr_t message_val = obj_getvalue(message);
+    return pagedir_ident_from_mapping(&message_val);
 }