CVS commit: src/sys/arch/x86/acpi

["Emmanuel Dreyfus" <manu%netbsd.org@localhost>]

Module Name:    src
Committed By:   manu
Date:           Thu Sep 12 00:52:22 UTC 2019

Modified Files:
        src/sys/arch/x86/acpi: acpi_machdep.c

Log Message:
Attempt to obtain ACPI RSDP from the hypervisor for Xen PV

There are three possible way of obtaining the ACPI RSDP
- From Extended BIOS Data Area (EBDA) when kernel or Xen was booted from
  BIOS bootstrap
- From EFI SystemTable when kernel is booted from EFI bootstrap
- When Xen is booted from EFI bootstrap, EBDA is not mapped, and EFI
  SystemTable is not passed to the kernel. The only way to go is to
  obtain ACPI RSDP trhough an hypercall.

Note: EFI bootstrap support for booting Xen has not yet been committed.


To generate a diff of this commit:
cvs rdiff -u -r1.26 -r1.27 src/sys/arch/x86/acpi/acpi_machdep.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.