From 614f731adb9cc86bd45ce749f597e68dbde253b1 Mon Sep 17 00:00:00 2001 From: Damien Hedde Date: Thu, 30 Jan 2020 16:02:04 +0000 Subject: hw/core/resettable: add support for changing parent MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add a function resettable_change_parent() to do the required plumbing when changing the parent a of Resettable object. We need to make sure that the reset state of the object remains coherent with the reset state of the new parent. We make the 2 following hypothesis: + when an object is put in a parent under reset, the object goes in reset. + when an object is removed from a parent under reset, the object leaves reset. The added function avoids any glitch if both old and new parent are already in reset. Signed-off-by: Damien Hedde Reviewed-by: Richard Henderson Reviewed-by: Philippe Mathieu-Daudé Tested-by: Philippe Mathieu-Daudé Message-id: 20200123132823.1117486-6-damien.hedde@greensocs.com Signed-off-by: Peter Maydell --- include/hw/resettable.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'include/hw/resettable.h') diff --git a/include/hw/resettable.h b/include/hw/resettable.h index c0b9fc6ad6..96073354fd 100644 --- a/include/hw/resettable.h +++ b/include/hw/resettable.h @@ -194,6 +194,22 @@ void resettable_release_reset(Object *obj, ResetType type); */ bool resettable_is_in_reset(Object *obj); +/** + * resettable_change_parent: + * Indicate that the parent of Ressettable @obj is changing from @oldp to @newp. + * All 3 objects must implement resettable interface. @oldp or @newp may be + * NULL. + * + * This function will adapt the reset state of @obj so that it is coherent + * with the reset state of @newp. It may trigger @resettable_assert_reset() + * or @resettable_release_reset(). It will do such things only if the reset + * state of @newp and @oldp are different. + * + * When using this function during reset, it must only be called during + * a hold phase method. Calling this during enter or exit phase is an error. + */ +void resettable_change_parent(Object *obj, Object *newp, Object *oldp); + /** * resettable_class_set_parent_phases: * -- cgit 1.4.1