The v8 ARM ARM defines that unused spaces in the ID_AA64* system
register ranges are Reserved and must RAZ, rather than being UNDEF.
Implement this.
In particular, ARM v8.2 adds a new feature register ID_AA64MMFR2,
and newer versions of the Linux kernel will attempt to read this,
which causes them not to boot up on versions of QEMU missing this fix.
Since the encoding .opc0 = 3, .opc1 = 0, .crn = 0, .crm = 2, .opc2 = 6
is actually defined in ARMv8 (as ID_MMFR4), we give it an entry in
the ARMCPU struct so CPUs can override it, though since none do
this too will just RAZ.
Backports commit e20d84c1407d43d5a2e2ac95dbb46db3b0af8f9f from qemu
If EL2 or EL3 is present on an AArch64 CPU, then exceptions can be
taken to an exception level which is running AArch32 (if only EL0
and EL1 are present then EL1 must be AArch64 and all exceptions are
taken to AArch64). To support this we need to have a single
implementation of the CPU do_interrupt() method which can handle both
32 and 64 bit exception entry.
Pull the common parts of aarch64_cpu_do_interrupt() and
arm_cpu_do_interrupt() out into a new function which calls
either the AArch32 or AArch64 specific entry code once it has
worked out which one is needed.
We temporarily special-case the handling of EXCP_SEMIHOST to
avoid an assertion in arm_el_is_aa64(); the next patch will
pull all the semihosting handling out to the arm_cpu_do_interrupt()
level (since semihosting semantics depend on the register width
of the calling code, not on that of any higher EL).
Backports commit 966f758c49ff478c4757efa5970ce649161bff92 from qemu
Move the aarch64_cpu_do_interrupt() function to helper.c. We want
to be able to call this from code that isn't AArch64-only, and
the move allows us to avoid awkward #ifdeffery at the callsite.
Backports commit f3a9b6945cbbb23f3a70da14e9ffdf1e60c580a8 from qemu
Add QOM property to the ARM CPU which boards can use to tell us what
memory region to use for secure accesses. Nonsecure accesses
go via the memory region specified with the base CPU class 'memory'
property.
By default, if no secure region is specified it is the same as the
nonsecure region, and if no nonsecure region is specified we will use
address_space_memory.
Backports commit 9e273ef2174d7cd5b14a16d8638812541d3eb6bb from qemu
Introduces reusable definitions for CPU affinity masks/shifts and gets rid
of hardcoded magic numbers.
Backports commit 0f4a9e45ec35811ee250ac232d84d3c6d4fcd7fc from qemu
On CPUs with EL3, there are two physical timers, one for Secure and one
for Non-secure. Implement this extra timer and the AArch64 registers
which access it.
Backports commit b4d3978c2fdf944e428a46d2850dbd950b6fbe78 from qemu
Define the MPUIR register for MPU supporting ARMv6 and onwards.
Currently we only support unified MPU.
The size of the unified MPU is defined via the number of "dregions".
So just a single config is added to specify this size. (When split MPU
is implemented we will add an extra iregions config).
Backports commit 3281af8114c6b8ead02f08b58e3c36895c1ea047 from qemu
For processors that support MPUs, add a property to de-feature it. This
is similar to the implementation of the EL3 feature.
The processor definition in init sets ARM_FEATURE_MPU if it can support
an MPU. post_init exposes the property, defaulting to true. If cleared
by the instantiator, ARM_FEATURE_MPU is then removed at realize time.
This is to support R profile processors that may or may-not have an MPU
configured.
Backports commit 8f325f568fbd0158cd413e7d637573ba90b3eaab from qemu
Add a boolean for indicating uniprocessors with MP extensions. This
drives the U bit in MPIDR. Prepares support for Cortex-R5.
Backports commit a8e81b319d1ae1224cc7059877dcdf04a5aad59d from qemu
When we're using KVM, the kernel's internal idea of the MPIDR
affinity fields must match the values we tell it for the guest
vcpu cluster configuration in the device tree. Since at the moment
the kernel doesn't support letting userspace tell it the correct
affinity fields to use, we must read the kernel's view and
reflect that back in the device tree.
Backports commit eb5e1d3c85dffe677da2550d211f9304a7d5ba3b from qemu
According to ARM Cortex-A53/A57 TRM, REVIDR reset value should be zero. So let
REVIDR reset value be specified by CPU model and correct it for Cortex-A53/A57.
Backports commit 13b72b2b9aa7ab7ee129e38e9587acd6a1b9a932 from qemu
Added a "has_el3" state property to the ARMCPU descriptor. This property
indicates whether the ARMCPU has security extensions enabled (EL3) or not.
By default it is disabled at this time.
Backports commit 51942aee3c51ca23b0dd78f95534a57e8dc1e582 from qemu
