Implement atomic.h for PPC, based off of the original Xen 3.2
implementation. This implementation depends on some functions that are
not yet defined (notably __cmpxchg), so it can't yet be used.
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Since QEMU's PowerNV support has matured to the point where it is
now suitable for development, drop support for booting on the
paravirtualized pseries machine type and its associated interfaces.
Support for booting on pseries was broken by 74b725a64d ('xen/ppc:
Implement initial Radix MMU support'), and since there is little
practical value in continuing to support pseries as a target, just drop
support for it entirely.
Fixes: 74b725a64d ('xen/ppc: Implement initial Radix MMU support')
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Run ppc64le tests with the PowerNV machine type (bare metal) instead of
the paravirtualized pseries machine. This requires a more modern version
of QEMU than is present in debian bullseye's repository, so update the
dockerfile to build QEMU from source.
Support for booting on pseries was broken by 74b725a64d ('xen/ppc:
Implement initial Radix MMU support') which resulted in CI failures. In
preparation for removing pseries support entirely, switch the CI
infrastructure to the PowerNV machine type.
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Add code to construct early identity-mapped page tables as well as the
required process and partition tables to enable the MMU.
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
A few files treewide depend on defininitions in headers that they
don't include. This works when arch headers end up including the
required headers by chance, but broke on ppc64 with only minimal/stub
arch headers.
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Introduce a small assembly loop in `start` to copy the kernel to
physical address 0 before continuing. This ensures that the physical
address lines up with XEN_VIRT_START (0xc000000000000000) and allows us
to identity map the kernel when the MMU is set up in the next patch.
We are also able to start execution at XEN_VIRT_START after the copy
since hardware will ignore the top 4 address bits when operating in Real
Mode (MMU off).
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
In preparation for implementing ISA3+ Radix MMU support, drop ISA 2.07B
from the supported ISA list to avoid having a non-working
configuration in tree. It can be re-added at a later point when Hash
MMU support is added.
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
When CONFIG_ARM is defined, a `vuart` field is added to struct ns16550,
but accesses to this field in ns16550_uart_dt_init weren't correctly
guarded. Fix build on !ARM platforms that define CONFIG_HAS_DEVICE_TREE
by correctly guarding access to the vuart field in this function.
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Implement the OPAL firmware calls required to write to the serial
console on PowerNV systems. Unlike pseries/Open Firmware, the OPAL
firmware interface can be used past early boot and as such the relevant
functions are not marked as __init.
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Communication with firmware boot services on PowerNV requires parsing
the fdt blob passed by the bootloader in order to obtain the firmware
entrypoint. Use Xen's libfdt to do this and store the information
required for firmware calls, to be implemented in a future patch.
The full xen/common build doesn't yet work, but libfdt and its xen/lib
dependency can be made to build by defining a few stub headers.
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
OPAL (OpenPower Abstraction Layer) is the interface exposed by firmware
on PowerNV (bare metal) systems. Import Linux's header definining the
API and related information.
From Linux commit 5321d1b1afb9a17302c6cec79f0cbf823eb0d3fc
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Switch Xen to the medium PIC code model on Power. Among other things,
this allows us to be load address agnostic and will open the door to
booting on bare metal PowerNV systems that don't use OpenFirmware.
Also update XEN_VIRT_START to 0xc000000000000000, which is equivalent to
address 0x0 when the MMU is off. This prevents Open Firmware from
loading Xen at an offset from its base load address, so the DECL_SECTION
hack in xen.lds.S is no longer required.
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Add an initial smoke test that boots xen on a ppc64/pseries machine and
checks for a magic string. Based on the riscv smoke test.
Eventually the powernv9 (POWER9 bare metal) machine type will want to be
tested as well, but for now we only boot on pseries.
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Jiamei Xie <jiamei.xie@arm.com>
On typical Power VMs (e.g. QEMU's -M pseries), a variety of services
including an early serial console are provided by Open Firmware.
Implement the required interfaces to call into Open Firmware and write
to the serial console.
Since Open Firmware runs in 32-bit Big Endian mode and Xen runs in
64-bit Little Endian mode, a thunk is required to save/restore
any potentially-clobbered registers as well as to perform the
required endianness switch. Thankfully, linux already has such
a routine, which was imported into ppc64/of-call.S.
Support for bare metal (PowerNV) will be implemented in a future
patch.
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Update ppc64/head.S to set up an initial boot stack, zero the .bss
section, and jump to C. The required setup is done using 32-bit
immediate address loads for now, but they will be changed to
TOC-relative loads once the position-independent code model is enabled.
Additionally, move the cpu0_boot_stack declaration to setup.c and change
STACK_ORDER from 2 to 0. For now, ppc64 is using 64k pages and thus the
larger STACK_ORDER is unnecessary.
Finally, refactor the endian fixup trampoline into its own macro, since it
will need to be used in multiple places, including every time we make a
call into firmware.
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Move a few more macros which have no dependencies on other headers from
xen/lib.h to xen/macros.h. Notably, this includes BUILD_BUG_ON* and
ARRAY_SIZE.
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
During an iteration of the initial ppc64le support patchset the default
defconfig was renamed but build.yaml wasn't updated to reflect this. Fix
it up.
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Add the build system changes required to build for ppc64le (POWER8+).
As of now the resulting image simply boots to an infinite loop.
$ make XEN_TARGET_ARCH=ppc64 -C xen build
This port targets POWER8+ CPUs running in Little Endian mode specifically,
and does not boot on older machines. Additionally, this initial skeleton
only implements the PaPR/pseries boot protocol which allows it to be
booted in a standard QEMU virtual machine:
$ qemu-system-ppc64 -M pseries-5.2 -m 256M -kernel xen/xen
Signed-off-by: Shawn Anastasio <sanastasio@raptorengineering.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Shawn Anastasio