sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

Add CFI start/end proc directives to arm64, i386, and ppc

Follow-up to r353959 and r368070: do the same for other architectures.

arm32 already seems to use its own .fnstart/.fnend directives, which

Add CFI start/end proc directives to arm64, i386, and ppc

Follow-up to r353959 and r368070: do the same for other architectures.

arm32 already seems to use its own .fnstart/.fnend directives, which
appear to be ARM-specific variants of the same thing. Likewise, MIPS
uses .frame directives.

Reviewed by: arichardson
Differential Revision: https://reviews.freebsd.org/D27387

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[PowerPC64LE] LE opal_call() implementation

OPAL runs in big endian, so we need to rfid into it to switch endian
atomically when branching to it, and we need to do the
RETURN_TO_NATIVE_ENDIAN dance

[PowerPC64LE] LE opal_call() implementation

OPAL runs in big endian, so we need to rfid into it to switch endian
atomically when branching to it, and we need to do the
RETURN_TO_NATIVE_ENDIAN dance when it returns to us.

Sponsored by: Tag1 Consulting, Inc.

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[PowerPC64LE] Work around qemu TCG bug in mtmsrd emulation.

The TCG implementation of mtmsrd in qemu blindly copies the entire register
to the MSR, instead of the specific bit positions listed in th

[PowerPC64LE] Work around qemu TCG bug in mtmsrd emulation.

The TCG implementation of mtmsrd in qemu blindly copies the entire register
to the MSR, instead of the specific bit positions listed in the ISA.

This means that qemu will prematurely switch endian out from under the
running code instead of waiting for the rfid, causing an immediate trap
as it attempts to interpret the next instruction in the wrong endianness.

To work around this, ensure PSL_LE is still set before doing the mtmsrd.

In the future, we may wish to just turn off translation and unconditionally
use rfid to switch to the ofmsr instead of quasi-switching to the ofmsr.

Add a new platform option so this can be disabled. (And so that we can
conditonalize additional QEMU-specific hacks in the platform code.)

Sponsored by: Tag1 Consulting, Inc.

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MFHead@r345677

powerpc64: Use medium code model in asm files for TOC references

Summary:
With a sufficiently large TOC, it's possible to index out of range, as
the immediate load instructions only permit 16-bit in

powerpc64: Use medium code model in asm files for TOC references

Summary:
With a sufficiently large TOC, it's possible to index out of range, as
the immediate load instructions only permit 16-bit indices, allowing up
to 64kB range (signed) from the base pointer. Allow +/- 2GB range, with
the medium code model TOC accesses in asm.

Patch originally by Brandon Bergren. The issue appears to impact ELFv2
more than ELFv1.

Reviewed by: luporl
Differential Revision: https://reviews.freebsd.org/D19708

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Merge ^/head r327624 through r327885.

PowerNV: initial support for OPAL

OPAL is a dedicated firmware acting as a hypervisor.
Add generic functions to provide all access.

Created by: Nathan Whitehorn <nw@freebsd.org>
Submitte

PowerNV: initial support for OPAL

OPAL is a dedicated firmware acting as a hypervisor.
Add generic functions to provide all access.

Created by: Nathan Whitehorn <nw@freebsd.org>
Submitted by: Wojciech Macek <wma@freebsd.org>

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