Drop TIF_USERSPACE and add addr_limit to the thread_info struct.
Subsequently, use that for address checking in strnlen_user() to
ward off bogus -EFAULTs.

Make __strnlen_user() return 0 on exception, rather than -EFAULT.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Nothing exciting here, just trivial fixes..
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

If a channel is not TEI capable, don't try to request_irq()..
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

This fixes a long-standing FIXME for G2 DMA, where we finally
wire up the IRQ handler and allow for sampling remaining bytes
while in-flight.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

This adds the VoyagerGX UART to the RTS7751R2D setup
code, and cleans up a few build issues.
Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Inhibit mapping through page tables in __ioremap() for PCI memory
apertures on SH7751 and SH7780-style PCI controllers, translation is
not possible for these areas. For other users that map a small window
in P1/P2 space, ioremap() traps that already, and should never make
it to __ioremap().
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

This cleans up quite a lot of the PCI mess that we
currently have, and attempts to consolidate the
duplication in the SH7780 and SH7751 PCI controllers.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

sh-sci was turning in to an unmaintainable mess, especially with
regards to the port list. This cleans it up quite a bit, and
switches over to a platform device model where subtypes will
register their port list individually in their setup code.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Some kgdb cleanup. Move hexchars/highhex/lowhex to the header, so it can
be reused by sh-sci. Also drop silly ctrl_inl/outl() overloading being
done by the kgdb stub.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

We had our own version, which serves no purpose. Simply
hook SH in to the generic one.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

This adds some simple PM stubs and the basic APM interfaces,
primarily for use by hp6xx, where the existing userland
expects it.
Signed-off-by: Andriy Skulysh <askulysh@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Drop _PAGE_SHARED/_PAGE_U0_SHARED and document Linux PTE encodings in
the PTEL value. Preserve the swap cache entry encoding semantics for
now, though it will need rework to free up _PAGE_WT from _PAGE_FILE.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

This fell behind a bit, get it updated so the documentation
has something in common with reality.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

SE73180 can use the generic support, we just need to
wire up the IRQ demuxing.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Trivial build fix.
Signed-off-by: Andriy Skulysh <askulysh@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Some of the paths were a bit broken, fix it up.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Make __xchg() a macro, so that gcc 4.0 doesn't blow up thanks to
always_inline..
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

No longer needed..
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

With the store queue API rework, we need to change the in-kernel
users too.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Initial register bank cleanup. Make SR.RB configurable, and add some
preliminary documentation on register bank usage within the kernel.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

This adds support for the Renesas SH7780 development boards,
R7780RP and R7780MP.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Rewrite the store queue API for a per-cpu interface in the driver
model. The old miscdevice is dropped, due to TASK_SIZE limitations,
and no one was using it anyways.

Carve up and allocate store queue space with a bitmap, back sq
mapping objects with a slab cache, and let userspace worry about
its own prefetching.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

This updates the various boards for some of the recent I/O routine
updates.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

There was a bug that got introduced when the split ptlock changes
went in where mm could be unintialized for user mappings, this
fixes it up..
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

We need this set to something sensible anywhere were we have
an aliasing dcache..
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

ioremap() overhaul. Add support for transparent PMB mapping, get rid of
p3_ioremap(), etc. Also drop ioremap() and iounmap() routines from the
machvec, as everyone can use the generic ioremap() API instead. For PCI
memory apertures and other special cases, use the pci_iomap() API, as
boards are already required to get the mapping right there.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Cleanup of page table allocators, using generic folded PMD and PUD
helpers. TLB flushing operations are moved to a more sensible spot.

The page fault handler is also optimized slightly, we no longer waste
cycles on IRQ disabling for flushing of the page from the ITLB, since
we're already under CLI protection by the initial exception handler.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Some modules seem to need this, so we export it..
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Add support for 32-bit physical addressing through the SH-4A
Privileged Space Mapping Buffer (PMB).
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Add support for the titan board.
Signed-off-by: Jamie Lenehan <lenehan@twibble.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

A synco is needed before we jump to start_kernel().

While we're at it, also move the sh_cpu_init() jump until after
we've zeroed BSS, as this has caused some undesirable results
in sh_cpu_init().
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Currently when making changes to control registers, we
typically need some time for changes to take effect (8
nops, generally).  However, for sh4a we simply need to
do an icbi..

This is a simple patch for implementing a general purpose
ctrl_barrier() which functions as a control register write
barrier. There's some additional documentation in the patch
itself, but it's pretty self explanatory.

There were also some places where we were not doing the
barrier, which didn't seem to have any adverse effects on
legacy parts, but certainly did on sh4a. It's safer to have
the barrier in place for legacy parts as well in these cases,
though this does make flush_tlb_all() more expensive (by an
order of 8 nops).  We can ifdef around the flush_tlb_all()
case for now if it's clear that all legacy parts won't have
a problem with this.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Add CPU_HAS_PTEA, refactor some of the cpu flag settings.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

This adds support for the I-O DATA Landisk.
Signed-off-by: kogiidena <kogiidena@eggplant.ddo.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Drop virt_to_bus() from sg_dma_address() so libata builds.
While we're at it, move sg_dma_address() and sg_dma_len()
from pci.h to scatterlist.h.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

There's a bug in the Hitachi SuperH csum_partial_copy_generic()
implementation.  If the supplied length is 1 (and several alignment
conditions are met), the function immediately branches to label 4.
However, the assembly at label 4 expects the length to be stored in
register r2.  Since this has not occurred, subsequent behavior is
undefined.

This can cause bad payload checksums in TCP connections.

I've fixed the problem by initializing register r2 prior to the branch
instruction.
Signed-off-by: Ollie Wild <aaw@rincewind.tv>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

We had a pretty interesting oops happening, where copy_user_page()
was down()'ing p3map_sem[] with a bogus offset (particularly, an
offset that hadn't been initialized with sema_init(), due to the
mismatch between cpu_data->dcache.n_aliases and what was assumed
based off of the old CACHE_ALIAS value).

Luckily, spinlock debugging caught this for us, and so we drop
the old hardcoded CACHE_ALIAS for sh4 completely and rely on the
run-time probed cpu_data->dcache.alias_mask. This in turn gets
the p3map_sem[] index right, and everything works again.

While we're at it, also convert to 4-level page tables..
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

The syscall table has lagged behind a bit, wire up the new ones..
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

It's defined in <linux/cpumask.h> and log is horribly flooded by
"redefined" messages.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

Merge support for SH7770 and SH7780 SH-4A subtypes.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>