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0cdc13fa0e
For apl_sdc_stable branch, we now have stac and clac to set and
clear AC bit of rflags. But it can't handle following sequence:
stac
stac
clac
user mode address access here will trigger page fault
clac
This patch introduce two more functions:
- stac_save: Save the rflags and set AC bit
- ac_restore: Restore the AC bit saved to rflags
Now, only sbuf_put/get are using these new APIs.
Tracked-On: #2525
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
ACRN Hypervisor ############### The open source `Project ACRN`_ defines a device hypervisor reference stack and an architecture for running multiple software subsystems, managed securely, on a consolidated system by means of a virtual machine manager. It also defines a reference framework implementation for virtual device emulation, called the “ACRN Device Model”. The ACRN Hypervisor is a Type 1 reference hypervisor stack, running directly on the bare-metal hardware, and is suitable for a variety of IoT and embedded device solutions. The ACRN hypervisor addresses the gap that currently exists between datacenter hypervisors, and hard partitioning hypervisors. The ACRN hypervisor architecture partitions the system into different functional domains, with carefully selected guest OS sharing optimizations for IoT and embedded devices. You can find out more about Project ACRN on the `Project ACRN documentation`_ website. .. _`Project ACRN`: https://projectacrn.org .. _`ACRN Hypervisor`: https://github.com/projectacrn/acrn-hypervisor .. _`Project ACRN documentation`: https://projectacrn.github.io/