PPC OEA mode and IOKit drivers
PPC OEA mode and IOKit drivers
- Subject: PPC OEA mode and IOKit drivers
- From: "Parav Pandit" <email@hidden>
- Date: Mon, 6 Dec 2004 11:40:27 +0530
- Importance: Normal
Hi,
PowerPC architecture generally defines 3 types of modes or programming
environment.
1. UIA (User instruction Architecture)
corresponds to user application programming instruction definitions.
2. VEA (Virtual Environment Arch.)
mid way to user space and OEA,
has support for cache modeling instructions, timing read instructions
support.
3. OEA (Operating Env. Arch.)
Memory management support.
timing write, cache modeling instructions etc.
This can use all the instructions of above two modes.
1. I think IOKit driver and the xnu kernel work in the OEA environment mode,
Am I correct? or I have misunderstood something?
2. Can somebody give more idea/ links on how to bind this concept of various
PPC programming mode to the xnu and IOKit driver?
Regards,
Parav Pandit
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