57939730b7
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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| guest | ||
| include | ||
| acpi_base.c | ||
| cmdline.c | ||
| reloc.c | ||