efiboot: Use 1:1 PA to VA mappings for RT services.

UEFI firmware on Snapdragon X Elite devices crashes when
SetVirtualAddressMap is called with runtime mappings that are not 1:1.
Always do this on arm64 as it won't interfere with KVA and will help us
avoid avoid a very common class of firmware bugs.

branches: 1.12.10;
Update to support EFI runtime outside the kernel virtual address space
by creating an EFI RT pmap that can be activated / deactivated when
required.

Adds support for EFI RT to ARM_MMU_EXTENDED (ASID) 32-bit Arm machines.

On Arm64 the usage of pmapboot_enter is reduced and the mappings are
created much later in the boot process -- now in cpu_startup_hook.
Backward compatiblity for KVA mapped RT from old bootaa64.efi is
maintained.

Adding support to other platforms should be easier as a result.

efiboot: Make FDT support optional on a per-arch basis.

bootaa64: explicitly set GNUEFIARCH and LIBGNUEFI_ARCH to aarch64

Be explicit about building for little endian. This allows efiboot to be
built with the aarch64eb toolchain.

Add module support.

Clean up the banner so it fits in 80 columns and add some extra details
to the "version" command output.

branches: 1.6.2;
Consistently use ${RELEASEDIR}/${RELEASEMACHINE} instead of
${RELEASEDIR}/${MACHINE} (Paul Ripke)

branches: 1.5.4; 1.5.6;
Make EFI runtime services available to the kernel. Bump version to 1.5.

Enable ACPI support.

Add ACPI support (enable with -DEFIBOOT_ACPI, currently disabled).

When UEFI reports that ACPI tables are available, generate a DTB with
compatible string "netbsd,generic-acpi" and pass this to the booted
kernel.

The DTB contains a /chosen property "netbsd,acpi-root-table" that contains
the physical address of the ACPI RSDP, along with a special /acpi node
with compatible string "netbsd,acpi" for the kernel to attach an acpi(4)
device driver.

branches: 1.2.2;
Add release target

Add MI EFI bootloader and AArch64 glue.

branches: 1.2.4;
Disable MMU and dcache before jumping to the kernel.

branches: 1.1.2;
Add MI EFI bootloader and AArch64 glue.

Allow an MD check in prepare_boot and use it on arm64 (aarch64) to check
that, if a big endian kernel is seen, the CPU is capable of supporting BE
data accesses at EL0 via ID_AA64MMFR0_EL1.BigEnd.

branches: 1.6.10;
Align output of "version" command.

Flush from kernel start, not the entry point.

Style fixes, NFCI.

Add a hook for MD specific info to print in the "ver" command. Use this
to print the value of the current execution level in bootaa64.

branches: 1.2.4; 1.2.14;
Disable MMU and dcache before jumping to the kernel.

branches: 1.1.2;
Add MI EFI bootloader and AArch64 glue.