On the e500 series, accessing SPR_EPR magically turns into an access at
that CPU's IACK register on the MPIC. Implement that logic to get kernels
that make use of that feature work.
Signed-off-by: NAlexander Graf <agraf@suse.de>

The BookE variant of MSR_SF is MSR_CM. Implement everything it takes in TCG to
support running 64bit code with MSR_CM set.
Signed-off-by: NAlexander Graf <agraf@suse.de>

The number of SPRs avaiable in different PowerPC chip is still increasing. Add
definitions for the MAS7_MAS3 SPR and all currently known bits in EPCR.
Signed-off-by: NAlexander Graf <agraf@suse.de>

Recent u-boot has different defines for its gzip extract buffer, but the
common ground seems to be 64MB. So let's bump it up to that, enabling me
to load my test image again ;).
Signed-off-by: NAlexander Graf <agraf@suse.de>

Device trees usually have a node /compatible, which indicate which machine
type we're looking at. For quick prototyping, it can be very useful to change
the contents of that node via the command line.

Thus, introduce a new option to -machine called dt_compatible, which when
set changes the /compatible contents to its value.
Signed-off-by: NAlexander Graf <agraf@suse.de>

Whatever we pass in to qemu_devtree_setprop to put into the device tree
will not get modified by that function, so it can easily be declared const.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@petalogix.com>

When generating serial port device tree nodes, we duplicate quite a bit
of code, because there are 2 of them in the mpc8544ds board we emulate.

Shove the generating code into a function, so we duplicate less code.
Signed-off-by: NAlexander Graf <agraf@suse.de>

If anyone outside of QEMU wants to mess with a QEMU generated device tree,
he needs to know which range phandles are valid in. So let's expose a
machine option that an external program can use to set the start allocate
id for phandles in QEMU.
Signed-off-by: NAlexander Graf <agraf@suse.de>

We want to be able to support >= 4GB of RAM. To do so, we need to be able
to tell the guest OS how much RAM it has.

However, that information today is capped to 32bit. So let's extend the
offset and size fields to 64bit, so we can fit in big addresses and even
one day - if we wish to do so - map devices above 32bit.
Signed-off-by: NAlexander Graf <agraf@suse.de>

Every time we use an address constant, it needs to potentially fit into
a 64bit physical address space. So let's define things accordingly.
Signed-off-by: NAlexander Graf <agraf@suse.de>

Due to popular demand, let's clean up the soc node a bit and use
more recent dt notions.
Requested-by: NScott Wood <scottwood@freescale.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

Due to popular demand, we're updating the way we generate the MPIC
node and interrupt lines based on what the current state of art is.
Requested-by: NScott Wood <scottwood@freescale.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

This reverts commit "dt: temporarily disable subtree creation
failure check" which was meant as a temporary solution to keep
external and dynamic device tree construction intact.

Now that we switched to fully dynamic dt construction, it's no
longer necessary.
Signed-off-by: NAlexander Graf <agraf@suse.de>

We want to be able to override the automatically created device tree
by using the -dtb option. Implement this for the mpc8544ds machine.
Signed-off-by: NAlexander Graf <agraf@suse.de>

We're passing the ram size as uint32_t, capping it to 32 bits atm.
Change to target_phys_addr_t (uint64_t) to make sure we have all
the bits.
Signed-off-by: NAlexander Graf <agraf@suse.de>

We have a nice 64bit helper to ease the device tree generation and
make the code more readable when creating 64bit 2-cell parameters.
Use it when generating the device tree.
Signed-off-by: NAlexander Graf <agraf@suse.de>

Now that we are dynamically creating the dtb, it's really useful to
be able to dump the created blob for debugging.

This patch implements a -machine dumpdtb=<file> option for e500 that
dumps the dtb exactly in the form the guest would get it to disk. It
can then be analyzed by dtc to get information about the guest
configuration.
Signed-off-by: NAlexander Graf <agraf@suse.de>

Now that all of the device tree bits are generated during runtime, we
can get rid of the device tree blob and instead start from scratch with
an empty device tree.
Signed-off-by: NAlexander Graf <agraf@suse.de>

Signed-off-by: NAlexander Graf <agraf@suse.de>

Signed-off-by: NAlexander Graf <agraf@suse.de>

Signed-off-by: NAlexander Graf <agraf@suse.de>

Signed-off-by: NAlexander Graf <agraf@suse.de>

Signed-off-by: NAlexander Graf <agraf@suse.de>

Signed-off-by: NAlexander Graf <agraf@suse.de>

Signed-off-by: NAlexander Graf <agraf@suse.de>

Signed-off-by: NAlexander Graf <agraf@suse.de>

Signed-off-by: NAlexander Graf <agraf@suse.de>

Signed-off-by: NAlexander Graf <agraf@suse.de>

Now that we're moving all of the device tree generation from an external
pre-execution generated blob to runtime generation using libfdt, we absolutely
must have libfdt around.

This requirement was there before already, as the only way to not require libfdt
with e500 was to not use -kernel, which was the only way to boot the mpc8544ds
machine. This patch only manifests said requirement in the build system.
Signed-off-by: NAlexander Graf <agraf@suse.de>

Some times in the device tree, we find an array of 2 u32 cells that
really are a single u64 value. This patch adds a helper to make the
creation of these easy.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@petalogix.com>

Phandle references work by having 2 pieces:

  - a "phandle" 1-cell property in the device tree node
  - a reference to the same value in a property we want to point
    to the other node

To generate the 1-cell property, we need an allocation mechanism that
gives us a unique number space. This patch adds an allocator for these
properties.
Signed-off-by: NAlexander Graf <agraf@suse.de>

We want to get rid of the concept of loading an external device tree and instead
generate our own. However, to do this we need to also create a device tree
template programatically.

This patch adds a helper to create an empty device tree in memory.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@petalogix.com>

This patch adds a helper to search for a node's phandle by its path. This
is especially useful when the phandle is part of an array, not just a single
cell in which case qemu_devtree_setprop_phandle would be the easy choice.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@petalogix.com>

Usually we want to know when creating a subtree fails. However, while
introducing this patch set we have to modify the device tree and some
times have the code to create a subtree in both the binary tree and
the dynamically created tree.

So ignore failures about this for now and enable them once we got rid
of the binary device tree.
Signed-off-by: NAlexander Graf <agraf@suse.de>

Phandles are the fancy device tree name for "pointer to another node".
To create a phandle property, we most likely want to reference to the
node we're pointing to by its path. So create a helper that allows
us to do so.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@petalogix.com>

We have device tree helpers that allow us to create single cell (u32)
wide properties. However, when creating properties that contain an array of
cells, we need to jump through hoops, manually passing in an array with
converted endianness.

To ease the pain of this, create a generic macro helper that allows us
to pass the cells as arguments.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@petalogix.com>

Our subnode creation helper can't handle creation of root subnodes,
like "/memory". Fix this by allowing the parent node to be an empty
string, indicating the root node.
Signed-off-by: NAlexander Graf <agraf@suse.de>
Reviewed-by: NPeter Crosthwaite <peter.crosthwaite@petalogix.com>

Move the declaration of s into the #ifdef sections that actually make
use of it.
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

This adds a qemu-specific hypervisor call to the pseries machine
which allows to do what amounts to memmove, memcpy and xor over
regions of physical memory such as the framebuffer.

This is the simplest way to get usable framebuffer speed from
SLOF since the framebuffer isn't mapped in the VRMA and so would
otherwise require an hcall per 8 bytes access.

The performance is still not great but usable, and can be improved
with a more complex implementation of the hcall itself if needed.

This also adds some documentation for the qemu-specific hypercalls
that we add to PAPR along with a new qemu,hypertas-functions property
that mirrors ibm,hypertas-functions and provides some discoverability
for the new calls.

Note: I chose note to advertise H_RTAS to the guest via that mechanism.
This is done on purpose, the guest uses the normal RTAS interfaces
provided by qemu (including SLOF) which internally calls H_RTAS.

We might in the future implement part (or even all) of RTAS inside the
guest like IBM's firmware does and replace H_RTAS with some finer grained
set of private hypercalls.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>

We were incorrectly g_free'ing an object that isn't allocated
in one error path and failed to release it completely in another

This fixes qemu crashes with some cases of IO errors.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NAlexander Graf <agraf@suse.de>