Follow aa0d5326 ("ia64: Use preempt_schedule_irq") and use
preempt_schedule_irq instead of enabling/disabling interrupts and
messing around with PREEMPT_ACTIVE in the nios2 low-level preemption
code ourselves. Also get rid of the now needless re-check for
TIF_NEED_RESCHED, preempt_schedule_irq will already take care of
rescheduling.

This also fixes the following build error when building with
CONFIG_PREEMPT:

arch/nios2/kernel/built-in.o: In function `need_resched':
arch/nios2/kernel/entry.S:374: undefined reference to `PREEMPT_ACTIVE'

Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: NTobias Klauser <tklauser@distanz.ch>
Acked-by: NLey Foon Tan <lftan@altera.com>

This patch initializes the mmu field of the cpuinfo structure to the
value supplied by the devicetree.
Signed-off-by: NWalter Goossens <waltergoossens@home.nl>
Acked-by: NLey Foon Tan <lftan@altera.com>

virtio wants to read bitwise types from userspace using get_user.  At the
moment this triggers sparse errors, since the value is passed through an
integer.

Fix that up using __force.
Suggested-by: NMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: NLey Foon Tan <lftan@altera.com>

Running "make defconfig" currently fails for nios2:
    $ make ARCH=nios2 defconfig
    scripts/kconfig/conf --defconfig Kconfig
    ***
    *** Can't find default configuration "arch/nios2/defconfig"!
    ***
    make[1]: *** [defconfig] Error 1
    make: *** [defconfig] Error 2

Add a definition for KBUILD_DEFCONFIG to the nios2's main Makefile to enable
this make target.
Signed-off-by: NPaul Bolle <pebolle@tiscali.nl>
Acked-by: NLey Foon Tan <lftan@altera.com>

Fix

drivers/gpu/drm/drm_bufs.c: In function 'drm_addmap_core':
drivers/gpu/drm/drm_bufs.c:213:5:
			error: implicit declaration of function 'ioremap_wc'

seen when building nios2:allmodconfig.
Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
Acked-by: NLey Foon Tan <lftan@altera.com>

If NIOS2_CMDLINE_IGNORE_DTB is selected but CMDLINE_BOOL isn't and thus
CONFIG_CMDLINE is not defined, the build fails with the following error:

arch/nios2/kernel/setup.c: In function 'nios2_boot_init':
arch/nios2/kernel/setup.c:131:30: error: 'CONFIG_CMDLINE' undeclared
(first use in this function)
   strncpy(boot_command_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);

This can be reproduced using randconfig with KCONFIG_SEED=0xE5B8749E, i.e.
'make KCONFIG_SEED=0xE5B8749E ARCH=nios2 randconfig'.

Fix this by letting NIOS2_CMDLINE_IGNORE_DTB depend on CMDLINE_BOOL, so we
actually have a default kernel command string to fall back to.
Signed-off-by: NTobias Klauser <tklauser@distanz.ch>
Acked-by: NLey Foon Tan <lftan@altera.com>

kernel/time/Kconfig expects that NR_CPUS is defined.

This fixes the following config warning:
"kernel/time/Kconfig:163:warning: range is invalid"

Follow 4cbbbb43 ("microblaze: Fix missing NR_CPUS in menuconfig")
Signed-off-by: NTobias Klauser <tklauser@distanz.ch>
Acked-by: NLey Foon Tan <lftan@altera.com>

TI_TASK is not used in nios2 assembly code, so remove it.
Signed-off-by: NTobias Klauser <tklauser@distanz.ch>
Acked-by: NLey Foon Tan <lftan@altera.com>

The irq member of struct nios2_timer is only written to but
never read, thus it can be removed.
Signed-off-by: NTobias Klauser <tklauser@distanz.ch>
Acked-by: NLey Foon Tan <lftan@altera.com>

shm_align_mask is not defined/used on nios2, thus there is no need to
declare it.
Signed-off-by: NTobias Klauser <tklauser@distanz.ch>
Acked-by: NLey Foon Tan <lftan@altera.com>

This is require for __iomem definition.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

Move asm-generic/io.h to end of file to override functions like
phys_to_virt, virt_to_phys in asm-generic/io.h.
This is due to recent commit 9216efaf introduced new way to
override functions by checking for the existence of a macro with the
same of the function.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

Don't need asm-generic/iomap.h and asm-generic/io.h added
default ioread8/16/32 iowrite8/16/32 implementation.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

Remove extra space between # and define.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

Return value of irq_of_parse_and_map() is unsigned int, with 0
indicating failure, so testing for negative result never works.
Signed-off-by: NDmitry Torokhov <dtor@chromium.org>
Reviewed-by: NTobias Klauser <tklauser@distanz.ch>
Acked-by: NLey Foon Tan <lftan@altera.com>

Make the checking for div/mul/mulx instruction config symbols easier to
read by using IS_ENABLED instead of #ifdefs.
Signed-off-by: NTobias Klauser <tklauser@distanz.ch>
Acked-by: NLey Foon Tan <lftan@altera.com>

This patch adds Makefile and Kconfig files required for building a
nios2 kernel.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

Add ptrace support for nios2.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch adds support for loadable modules.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This file contains constants for the instruction macros, cpu registers,
fields and bits.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch introduces a few nios2-specific header files.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

Signed-off-by: NLey Foon Tan <lftan@altera.com>

Add time keeping code for nios2.
Signed-off-by: NLey Foon Tan <lftan@altera.com>
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>

Add device tree support to arch/nios2.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

Add optimised library functions for nios2.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch adds support for signal handling.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch adds support for system calls from userspaces. It uses the
asm-generic/unistd.h definitions with architecture spcific syscall.
The sys_call_table is just an array defined in a C file and it contains
pointers to the syscall functions.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch adds definitions for the ELF format
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch adds support for the DMA mapping API.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch adds the support for IRQ handling.
Signed-off-by: NLey Foon Tan <lftan@altera.com>
Reviewed-by: NThomas Gleixner <tglx@linutronix.de>

This patch adds the TLB maintenance functions.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch adds functionality required for cache maintenance.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch adds support for thread creation and context switching.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch adds support for page table management.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch adds support for the handling of the MMU faults (exception
entry code introduced by a previous patch, kernel/entry.S).
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch adds several definitions for I/O accessors and ioremap().
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch contains the initialisation of the memory blocks, MMU
attributes and the memory map.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch contains traps exception handling.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch contains the exception entry code (kernel/entry.S) and
misaligned exception.
Signed-off-by: NLey Foon Tan <lftan@altera.com>

This patch adds the kernel booting and the initial setup code.
Signed-off-by: NLey Foon Tan <lftan@altera.com>