Changeset e037cf37 in mainline for kernel/genarch/src/drivers/ega/ega.c

Timestamp:

2020-12-29T22:17:21Z (3 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.

File:

• kernel/genarch/src/drivers/ega/ega.c (modified) (2 diffs)

kernel/genarch/src/drivers/ega/ega.c

@@ -568 +568 @@
 }
 
-static void ega_redraw(outdev_t *dev)
-{
-        ega_instance_t *instance = (ega_instance_t *) dev->data;
-
-        irq_spinlock_lock(&instance->lock, true);
-
+static void ega_redraw_internal(ega_instance_t *instance)
+{
         memcpy(instance->addr, instance->backbuf, EGA_VRAM_SIZE);
         ega_move_cursor(instance);
         ega_show_cursor(instance);
-
+}
+
+static void ega_redraw(outdev_t *dev)
+{
+        ega_instance_t *instance = (ega_instance_t *) dev->data;
+
+        irq_spinlock_lock(&instance->lock, true);
+        ega_redraw_internal(instance);
         irq_spinlock_unlock(&instance->lock, true);
+}
+
+/** EGA was mapped or unmapped.
+ *
+ * @param arg EGA instance
+ */
+static void ega_mapped_changed(void *arg)
+{
+        ega_instance_t *instance = (ega_instance_t *) arg;
+
+        if (!instance->parea.mapped) {
+                irq_spinlock_lock(&instance->lock, true);
+                ega_redraw_internal(instance);
+                irq_spinlock_unlock(&instance->lock, true);
+        }
 }
 
@@ -621 +639 @@
         instance->parea.unpriv = false;
         instance->parea.mapped = false;
+        instance->parea.mapped_changed = ega_mapped_changed;
+        instance->parea.arg = (void *) instance;
         ddi_parea_register(&instance->parea);