Changeset e037cf37 in mainline for kernel/generic/src

Timestamp:

2020-12-29T22:17:21Z (5 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

11e394f, d70dc1c4

Parents:

1483981

Message:

Show kernel console again when its physical area is unmapped

It's good to be able to see the stack trace if e.g. display server
crashes.

Location:

kernel/generic/src

Files:

• ddi/ddi.c (modified) (2 diffs)
• mm/backend_phys.c (modified) (2 diffs)

kernel/generic/src/ddi/ddi.c

@@ -107 +107 @@
 }
 
+/** Norify physical area has been unmapped.
+ *
+ * @param parea Physical area
+ */
+void ddi_parea_unmap_notify(parea_t *parea)
+{
+        parea->mapped = false;
+        if (parea->mapped_changed != NULL)
+                parea->mapped_changed(parea->arg);
+}
+
 /** Map piece of physical memory into virtual address space of current task.
  *
@@ -204 +215 @@
 
 map:
+        backend_data.parea = parea;
+
         if (!as_area_create(TASK->as, flags, FRAMES2SIZE(pages),
             AS_AREA_ATTR_NONE, &phys_backend, &backend_data, virt, bound)) {

kernel/generic/src/mm/backend_phys.c

@@ -38 +38 @@
 
 #include <assert.h>
+#include <ddi/ddi.h>
 #include <typedefs.h>
 #include <mm/as.h>
@@ -101 +102 @@
 {
         /*
-         * Nothing to do.
          * The anonymous frames, if any, are released in
          * phys_destroy_shared_data().
          */
+
+        /* Notify parea has been unmapped */
+        if (area->backend_data.parea != NULL)
+                ddi_parea_unmap_notify(area->backend_data.parea);
 }