We save one page of RAM dropping swapper_pg_dir.
It was only used for an assignment in init-mm.c and we
redid this later in srmmu.c anyway.

This is likely a left-over from the sun4c removal.

To avoid a dummy variable we use a simple #define swapper_pg_dir NULL
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

It was assigned, but never referenced later.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

head_32.S failed to set cputypval for leon, causing boot to fail.
The boot failed because we failed to recognize this was a LEON
cpu so we did not preoperly run-time patch the the kernel.
This resulted in an early crash.
Reported-by: NDaniel Hellstrom <daniel@gaisler.com>
Tested-by: NDaniel Hellstrom <daniel@gaisler.com>
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Cc: Konrad Eisele <konrad@gaisler.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Fix-up leon specific assembler to use ASI_LEON_MMUREGS
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Cc: Daniel Hellstrom <daniel@gaisler.com>
Cc: Konrad Eisele <konrad@gaisler.com>

This gives us a C hook before we call start_kernel()
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

We use the compatibility property to determine the
sun models. For leon we use psr.impl and ignore the
result of the getprops call.

Include a hack to allow build as the support code
is not yet converted.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Cc: Daniel Hellstrom <daniel@gaisler.com>
Cc: Konrad Eisele <konrad@gaisler.com>

Use PSR to check if the CPU is LEON and jump to
LEON specific code in this case.

Added a few constants to psr.h to increase readability.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Cc: Daniel Hellstrom <daniel@gaisler.com>
Cc: Konrad Eisele <konrad@gaisler.com>

A few strings have been adopted to show more relevant info.

Julian Calaby <julian.calaby@gmail.com> pointed out one
that I would otherwise have missed.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>

Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

It is written, but never actually read.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

For the explicit calls to .udiv/.umul in assembler, I made a
mechanical (read as: safe) transformation.  I didn't attempt
to make any simplifications.

In particular, __ndelay and __udelay can be simplified significantly.
Some of the %y reads are unnecessary and these routines have no need
any longer for allocating a register window, they can be leaf
functions.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

It's the one aberration in v8, the only cpu that
didn't actually have hardware multiply and divide
instructions.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
Acked-by: NSam Ravnborg <sam@ravnborg.org>

We know this is not a sun4/sun4c - as we checked earlier.
So no need to repeat the check.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

It was present only to support the sun4, sun4c boxes which
do not have the "compatible" property in the root-node
of the device tree.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

We already sorted out if we are a sun4/sun4c and halted.
So no need to check the prom version as we know this is
a v2 or v3 as sun4m, sun4d etc. does not use a v1 prom.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This gives us back 7 pages...
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

We need to do the check before we try to remap the kernel using
SRMMU operations.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The non-SMP sun4m NMI handler was still accessing SUN4C registers.

Fix that and share the sun4m NMI trap code between SMP and non-SMP
cases.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

As we no longer support sun4c we can remove all the code to
support remapping the kernel in head_32.S.
We also try to tell the user that the machine is not support,
in case someone try to boot the kernel on a sun4c one day
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

We used to runtime patch the trap table for srmmu.
With the removal of sun4c support this is no longer required.

With the sun4c trap removed we can remove all the referenced
trap handling which is sun4c specific.
This also allows us to get rid of the nosun4c.c file that
contained only dummy functions/data.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Machines with sun4c support are very rare these days, and noone
is using them for any practical purposes.
The sun4c support has been know broken for quite some time too.

So rather than trying to keep it up-to-date, lets get rid of it.
This allows us to do some very welcome cleanup of sparc32 support.

Updated the former sun4c specifc nmi (which was also used
for sun4m UP) to be a generic UP NMI.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

* proper initialization of boot_cpu_id (no hardcoding to 0)
 * use boot_cpu_id index to address into the IRQ controller where
   appropriate

Each CPU has a separate set of IRQ controller registers, this
patch makes sure that the boot-cpu registers are used instead
of CPU0's.
Signed-off-by: NDaniel Hellstrom <daniel@gaisler.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Define boot_cpu_id in single-processor kernels as well. This is
to support architectures which can boot on other than CPU0.

Sam Ravnborg has written the cleanup parts by extracting
boot_cpu_id from smp_32.c into setup_32.c and cleaned up
sun4d_irq.c.

boot_cpu_id was initialized before BSS was cleared in
sun4c_continue_boot, instead boot_cpu_id is set to 0xff to
avoid BSS. If boot_cpu_id is untouched (0xff) by bootup code
it will be overwritten to 0. boot_cpu_id4 is automatically
calculated in common code.
Signed-off-by: NDaniel Hellstrom <daniel@gaisler.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

We use "_start" in 64 bit - do the same in 32 bit.
It is always good to be consistent.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Support SMP for a Sparc-Leon multiprocessor system.
Add Leon specific SMP code to arch/sparc/kernel/leon_smp.c.
Signed-off-by: NKonrad Eisele <konrad@gaisler.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Add sparc_leon enum, M_LEON|M_LEON3_SOC machine. Add compilation of
leon.c in mm and kernel
if CONFIG_SPARC_LEON is defined. Add sparc_leon dependent
initialization to switch statements + head.S.
Signed-off-by: NKonrad Eisele <konrad@gaisler.com>
Reviewed-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The section .text.init.refok is deprecated and __REF (.ref.text)
should be used in assembly files instead.  This patch cleans up a few
uses of .text.init.refok in the sparc architecture.

Also fix a reference to .text.init in a comment that wasn't updated to
.init.text.
Signed-off-by: NTim Abbott <tabbott@mit.edu>
Cc: David S. Miller <davem@davemloft.net>
Acked-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This has the consequence of changing the section name use for head
code from ".text.head" to ".head.text".  Since this commit changes all
users in the architecture, this change should be harmless.
Signed-off-by: NTim Abbott <tabbott@mit.edu>
Cc: David S. Miller <davem@davemloft.net>
Acked-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

While doing this use standard names for start/end
so we could use definitions straight from asm-generic
for all the typical symbols.

This also allowed us to drop the use of PROVIDE in the linker
script so sprc is less non-standard on this area.
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

o sparc32 files with identical names to sparc64 renamed to <name>_32.S
o introduced a few Kconfig helpers to simplify Makefile logic
o refactored Makefile to prepare for unification
  - use obj-$(CONFIG_SPARC32) for sparc32 specific files
  - use <name>_$(BITS) for files where sparc64 has a _64 variant
  - sparc64 directly include a few files where sparc32 builds them,
    refer to these files directly (no BITS)
  - sneaked in -Werror as used by sparc64
o modified sparc/Makefile to use the new names for head/init_task
Signed-off-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

usual .text.head trick
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This reverts commit 8dd94537.

This fixes a boot failure reported by Robert Reif.

The code above the section change expects to fallthrough, so
we can't make such a section change here.

Latest mainline gives this section mismatch on sparc:

The function current_pc() references
the variable __init no_sun4u_here.
This is often because current_pc lacks a __init
annotation or the annotation of no_sun4u_here is wrong.

Since current_pc() is used only in early time, it is correct to
put it in .init section.
Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

While doing some easy cleanups on the sparc code I noticed that the
CONFIG_SUN4 code seems to be worse than the rest - there were some
"I don't know how it should work, but the current code definitely cannot
work." places.

And while I have seen people running Linux on machines like a
SPARCstation 5 a few years ago I don't recall having seen sun4
machines, even less ones running Linux.
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch contains the following possible cleanups:
- make the following needlessly global code static:
  - apc.c: apc_swift_idle()
  - ebus.c: ebus_blacklist_irq()
  - ebus.c: fill_ebus_child()
  - ebus.c: fill_ebus_device()
  - entry.S: syscall_is_too_hard
  - etra: tsetup_sun4c_stackchk
  - head.S: cputyp
  - head.S: prom_vector_p
  - idprom.c: Sun_Machines[]
  - ioport.c: _sparc_find_resource()
  - ioport.c: create_proc_read_entry()
  - irq.c: struct sparc_irq[]
  - rtrap.S: sun4c_rett_stackchk
  - setup.c: prom_sync_me()
  - setup.c: boot_flags
  - sun4c_irq.c: sun4c_sbint_to_irq()
  - sun4d_irq.c: sbus_tid[]
  - sun4d_irq.c: struct sbus_actions
  - sun4d_irq.c: sun4d_sbint_to_irq()
  - sun4m_irq.c: sun4m_sbint_to_irq()
  - sun4m_irq.c: sun4m_get_irqmask()
  - sun4m_irq.c: sun4m_timers
  - sun4m_smp.c: smp4m_cross_call()
  - sun4m_smp.c: smp4m_blackbox_id()
  - sun4m_smp.c: smp4m_blackbox_current()
  - time.c: sp_clock_typ
  - time.c: sbus_time_init()
  - traps.c: instruction_dump()
  - wof.S: spwin_sun4c_stackchk
  - wuf.S: sun4c_fwin_stackchk
- #if 0 the following unused code:
  - process.c: sparc_backtrace_lock
  - process.c: __show_backtrace()
  - process.c: show_backtrace()
  - process.c: smp_show_backtrace_all_cpus()
- remove the following unused code:
  - entry.S: __handle_exception
  - smp.c: smp_num_cpus
  - smp.c: smp_activated
  - smp.c: __cpu_number_map[]
  - smp.c: __cpu_logical_map[]
  - smp.c: bitops_spinlock
  - traps.c: trap_curbuf
  - traps.c: trapbuf[]
  - traps.c: linux_smp_still_initting
  - traps.c: thiscpus_tbr
  - traps.c: thiscpus_mid
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch removes the CVS keywords that weren't updated for a long time
from comments.
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Current limitations:

1) On SMP single stepping has some fundamental issues,
   shared with other sw single-step architectures such
   as mips and arm.

2) On 32-bit sparc we don't support SMP kgdb yet.  That
   requires some reworking of the IPI mechanisms and
   infrastructure on that platform.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

As per Documentation/feature-removal-schedule.txt
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Fix recent kdebug changes to compile on sparc32.
Signed-off-by: NRobert Reif <reif@earthlink.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This patch moves the die notifier handling to common code.  Previous
various architectures had exactly the same code for it.  Note that the new
code is compiled unconditionally, this should be understood as an appel to
the other architecture maintainer to implement support for it aswell (aka
sprinkling a notify_die or two in the proper place)

arm had a notifiy_die that did something totally different, I renamed it to
arm_notify_die as part of the patch and made it static to the file it's
declared and used at.  avr32 used to pass slightly less information through
this interface and I brought it into line with the other architectures.

[akpm@linux-foundation.org: build fix]
[akpm@linux-foundation.org: fix vmalloc_sync_all bustage]
[bryan.wu@analog.com: fix vmalloc_sync_all in nommu]
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Cc: <linux-arch@vger.kernel.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: NBryan Wu <bryan.wu@analog.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>