Signed-off-by: NDavid S. Miller <davem@davemloft.net>

It doesn't like const variables being passed into
"i" constraing asm operations.  It's a bug, but
there is nothing we can really do but work around
it.

Based upon a report from Andrew Morton.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

And check for errors at call sites.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This is where we learn how to get the interrupts
for things like the hypervisor console device.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

It is not PCI specific, it is for all system interrupts.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This handles the SUN4U vs SUN4V PTE layout differences
with near zero performance cost.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Yes, you heard it right, they changed the PTE layout for
SUN4V.  Ho hum...

This is the simple and inefficient way to support this.
It'll get optimized, don't worry.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

We do this right after we take over the trap table from OBP.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Code patching did not sign extend negative branch
offsets correctly.

Kernel TLB miss path needs patching and %g4 register
preservation in order to handle SUN4V correctly.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Since it can do things like BREAK and HUP, we implement
this as a serial uart driver.

This still needs interrupt probing code, as I haven't figured
out how interrupts will work or be probed for on SUN4V yet.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This is where the virtual address of the fault status
area belongs.

To set it up we don't make a hypervisor call, instead
we call OBP's SUNW,set-trap-table with the real address
of the fault status area as the second argument.  And
right before that call we write the virtual address into
ASI_SCRATCHPAD vaddr 0x0.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

For constructing hypervisor PCI TSB IDs.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add assembler file for PCI hypervisor calls.
Setup basic skeleton of SUN4V PCI controller driver.

Add 32-bit devhandle to PBM struct, as this is needed for
hypervisor calls.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Abstract out IOMMU operations so that we can have a different
set of calls on sun4v, which needs to do things through
hypervisor calls.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Delete unused macros, and use fixed sized types in
sparc32 header.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

When we register a TSB with the hypervisor, so that it or hardware can
handle TLB misses and do the TSB walk for us, the hypervisor traps
down to these trap when it incurs a TSB miss.

Processing is simple, we load the missing virtual address and context,
and do a full page table walk.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

We look for "SUNW,sun4v" in the 'compatible' property
of the root OBP device tree node.

Protect every %ver register access, to make sure it is
not touched on sun4v, as %ver is hyperprivileged there.

Lock kernel TLB entries using hypervisor calls instead of
calls into OBP.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Technically the hypervisor call supports sending in a list
of all cpus to get the cross-call, but I only pass in one
cpu at a time for now.

The multi-cpu support is there, just ifdef'd out so it's easy to
enable or delete it later.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Sun4v has 4 interrupt queues: cpu, device, resumable errors,
and non-resumable errors.  A set of head/tail offset pointers
help maintain a work queue in physical memory.  The entries
are 64-bytes in size.

Each queue is allocated then registered with the hypervisor
as we bring cpus up.

The two error queues each get a kernel side buffer that we
use to quickly empty the main interrupt queue before we
call up to C code to log the event and possibly take evasive
action.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Also, correct TRAP_PER_CPU_FAULT_INFO define, it should be
0x40 not 0x20.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

sun4v uses ASI_MMU instead of ASI_DMMU
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

For the expansion of __GET_CPUID() on SMP.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Things are a little tricky because, unlike sun4u, we have
to:

1) do a hypervisor trap to do the TLB load.
2) do the TSB lookup calculations by hand
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

If we're just switching between different alternate global
sets, nop it out on sun4v.  Also, get rid of all of the
alternate global save/restore in the OBP CIF trampoline code.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

They are totally unnecessary because:

1) Interrupts are already disabled when switch_to()
   runs.

2) We don't use hard-coded alternate globals any longer.

This found a case in rtrap, which still assumed alternate
global %g6 was current_thread_info(), and that is fixed
by this changeset as well.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Instead of setting/clearing PSTATE_AG we have to change
the %gl register value on sun4v.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NDavid S. Miller <davem@davemloft.net>