If a dtb is passed to the kernel then the kernel needs to iterate
through compiled-in mdescs looking for one that matches and move the
dtb data to a safe location before it gets accidentally overwritten by
the kernel.

This patch creates a new function, setup_machine_fdt() which is
analogous to the setup_machine_atags() created in the previous patch.
It does all the early setup needed to use a device tree machine
description.

v5: - Print warning with neither dtb nor atags are passed to the kernel
    - Fix bug in setting of __machine_arch_type to the selected machine,
      not just the last machine in the list.
Reported-by: NTixy <tixy@yxit.co.uk>
    - Copy command line directly into boot_command_line instead of cmd_line
v4: - Dump some output when a matching machine_desc cannot be found
v3: - Added processing of reserved list.
    - Backed out the v2 change that copied instead of reserved the
      dtb.  dtb is reserved again and the real problem was fixed by
      using alloc_bootmem_align() for early allocation of RAM for
      unflattening the tree.
    - Moved cmd_line and initrd changes to earlier patch to make series
      bisectable.
v2: Changed to save the dtb by copying into an allocated buffer.
    - Since the dtb will very likely be passed in the first 16k of ram
      where the interrupt vectors live, memblock_reserve() is
      insufficient to protect the dtb data.

[based on work originally written by Jeremy Kerr <jeremy.kerr@canonical.com>]
Tested-by: NTony Lindgren <tony@atomide.com>
Acked-by: NNicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

In preparation for adding device tree support, this patch consolidates
all of the atag-specific setup into a single function.

v5: - drop double printk("Machine; %s\n", ...); call.
    - leave copying boot_command_line in setup_arch() since it isn't
      atags specific.
v4: - adapt to the removal of lookup_machine_type()
    - break out dump of machine_desc table into dump_machine_table()
      because the device tree probe code will use it.
    - Add for_each_machine_desc() macro
Tested-by: NTony Lindgren <tony@atomide.com>
Acked-by: NNicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: NRussell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

Since commit 6fc31d54 this comment is no longer true.
Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

This allows platforms to hook into the initialization early to setup
things like scheduler clocks, etc.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Rather than storing each machine init hook separately, store a
pointer to the machine description record and dereference this
instead.  This pointer is only available while the init sections
are present, which is not a problem as we only use it from init
code.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Normally different ARM platform has different way to decode the IRQ
hardware status and demultiplex to the corresponding IRQ handler.
This is highly optimized by macro irq_handler in entry-armv.S, and
each machine defines their own macro to decode the IRQ number.
However, this prevents multiple machine classes to be built into a
single kernel.

By allowing each machine to specify thier own handler, and making
function pointer 'handle_arch_irq' to point to it at run time, this
can be solved. And introduce CONFIG_MULTI_IRQ_HANDLER to allow both
solutions to work.

Comparing with the highly optimized macro of irq_handler, the new
function must be written with care not to lose too much performance.
And the IPI stuff on SMP is expected to move to the provided arch
IRQ handler as well.

The assembly code to invoke handle_arch_irq is optimized by Russell
King.
Signed-off-by: NEric Miao <eric.miao@canonical.com>
Acked-by: NNicolas Pitre <nicolas.pitre@linaro.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Since we're now using addruart to establish the debug mapping, we can
remove the io_pg_offst and phys_io members of struct machine_desc.

The various declarations were removed using the following script:

  grep -rl MACHINE_START arch/arm | xargs \
  sed -i '/MACHINE_START/,/MACHINE_END/ { /\.\(phys_io\|io_pg_offst\)/d }'

[ Initial patch was from Jeremy Kerr, example script from Russell King ]
Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>
Acked-by: Eric Miao <eric.miao at canonical.com>

As mentioned in the comment right at the top, the first four fields
are directly accessed by assembly code in head.S.  Move nr_irqs so the
comment is true again.
Signed-off-by: NNicolas Pitre <nicolas.pitre@linaro.org>

Move the platform specific bootmem memory reservations out of
arch/arm/mm/mmu.c into their respective platform files.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

So to allow NR_IRQS to be dynamic and platforms to specify the number
of IRQs really needed.
Acked-by: NPaul Mundt <lethal@linux-sh.org>
Signed-off-by: NEric Miao <eric.y.miao@gmail.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Move platform independent header files to arch/arm/include/asm, leaving
those in asm/arch* and asm/plat* alone.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

This patch updates stale comment that pointed to nonexistent file.
Signed-off-by: NLeonid Evdokimov <leon@darkk.net.ru>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Use the newly introduced __used attribute in place of the deprecated
__attribute_used__.  Functionally the same.
Signed-off-by: NDavid Rientjes <rientjes@google.com>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Patch from Nicolas Pitre

This field is redundent since it must be equal to PHYS_OFFSET anyway.

There is no reference to it anymore so remove it at last.
Signed-off-by: NNicolas Pitre <nico@cam.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

asm/mach/arch.h introduced a __deprecated, but didn't include compiler.h,
causing:

In file included from arch/arm/mach-at91rm9200/devices.c:13:
include/asm/mach/arch.h:23: warning: no semicolon at end of struct or union
include/asm/mach/arch.h:23: error: syntax error before 'phys_ram'
include/asm/mach/arch.h:34: error: syntax error before ':' token
include/asm/mach/arch.h:35: error: syntax error before ':' token
include/asm/mach/arch.h:36: error: syntax error before ':' token
include/asm/mach/arch.h:37: error: syntax error before ':' token
include/asm/mach/arch.h:45: error: syntax error before '}' token

Add the necessary include.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Patch from Nicolas Pitre

This field is redundent since it must be equal to PHYS_OFFSET anyway.

Now that no code uses it anymore, mark it deprecated and remove all
initializations from the tree.
Signed-off-by: NNicolas Pitre <nico@cam.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Since the machine information structures are now static, the
compiler might optimise them away.  Mark them with
__attribute_used__ to prevent this occuring.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Fix sparse warnings in arch/arm/kernel/module.c,
arch/arm/mm/consistent.c, drivers/pcmcia/sa1111_generic.c,
and platform support files.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Patch from Ben Dooks

The `make buildcheck` is erroneously reporting that the .arch.info
list is referencing items in the .init section as it is not itself
postfixed with .init
Signed-off-by: NBen Dooks <ben-linux@fluff.org>
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Remove the pointless machine description macros, favouring C99
initialisers instead.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!