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Per ACPI 6.2 spec, chapter 5.2.5.2 "Finding the RSDP on UEFI Enabled Systems": In Unified Extensible Firmware Interface (UEFI) enabled systems, a pointer to the RSDP structure exists within the EFI System Table. The OS loader is provided a pointer to the EFI System Table at invocation. The OS loader must retrieve the pointer to the RSDP structure from the EFI System Table and convey the pointer to OSPM, using an OS dependent data structure, as part of the hand off of control from the OS loader to the OS. So when ACRN boot from direct mode on a UEFI enabled system, hypervisor might be failed to get rsdp by seaching rsdp in legacy EBDA or 0xe0000~0xfffff region, but it still have chance to get rsdp by seaching it in e820 ACPI reclaimable region with some edk2 based BIOS. The patch will search rsdp from e820 ACPI reclaim region When failed to get rsdp from legacy region. Tracked-On: #4301 Signed-off-by: Victor Sun <victor.sun@intel.com> Reviewed-by: Fei Li <fei1.li@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com> |
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| arch/x86 | ||
| boot | ||
| bsp/ld | ||
| common | ||
| debug | ||
| dm | ||
| hw | ||
| include | ||
| lib | ||
| pre_build | ||
| release | ||
| scenarios | ||
| scripts | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README.rst | ||
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/