Changeset 1ad52de in mainline for kernel/generic/src/interrupt/interrupt.c

Timestamp:

2011-01-04T22:32:37Z (14 years ago)

Author:

Jiri Svoboda <jiri@…>

Branches:

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

Children:

cd22764

Parents:

63594c0

Message:

Add comment.

File:

• kernel/generic/src/interrupt/interrupt.c (modified) (1 diff)

kernel/generic/src/interrupt/interrupt.c

@@ -209 +209 @@
 }
 
+/** Get istate structure of a thread.
+ *
+ * Get pointer to the istate structure at the bottom of the kernel stack.
+ *
+ * This function can be called in interrupt or user context. In interrupt
+ * context the istate structure is created by the low-level exception
+ * handler. In user context the istate structure is created by the
+ * low-level syscall handler.
+ */
 istate_t *istate_get(thread_t *thread)
 {
+        /*
+         * The istate structure should be right at the bottom of the kernel
+         * stack.
+         */
         return (istate_t *) ((uint8_t *) thread->kstack + THREAD_STACK_SIZE -
             sizeof(istate_t));