| Age | Commit message (Collapse) | Author |
|---|
|
New microblaze systems uses two buses. One for memories
and flashes and the second for low-speed peripherals
which can run on different CLK. This is the reason
why the kernel is trying to read clock-frequency
directly from node. If there is then the kernel will
work with it. If not then cpu CLK is used.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Microblaze little-endian toolchain exports __MICROBLAZEEL__
which is used in the kernel to identify little/big endian.
The most of the changes are in loading values from DTB which
is always big endian.
Little endian platforms are based on new AXI bus which has
impact to early uartlite initialization.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Just need to use little-endian opcode for brki r16, 0x18
Signed-off-by: Michal Simek <monstr@monstr.eu>
CC: Jason Wessel <jason.wessel@windriver.com>
|
|
Upcomming microblaze version will support little-endian.
Signed-off-by: Michal Simek <monstr@monstr.eu>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
|
|
Early console support reuse setting from U-BOOT that's why
it is not necessary to setup baudrates, etc.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Kconfig blocks to select any other early console support that's why
this patch has no real impact on current kernel version. But it is done
because of uart16550.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Just setup pointer early console in run time.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
This is done because of uart16550 early printk support
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Device-tree BSP generates longer compatible properties
that's why we can remove extra/old one.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
It comes from past where pvr wasn't supported in msr instruction.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Several kernel modules requires empty_zero_page and mbc
to be exported.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Replaced libgcc functions with asm optimized implementation.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
PVR for 7.30.b, 8.00.a versions.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
OUTPUT_FORMAT setup bigendian platform. Microblaze Linux port
is becoming bi endian that's why it is removed.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
r16 and r17 should be saved across interrupt and exception handling.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Kernel needs two timers because of clocksource and clockevent.
It is better to show warning message directly on early
console if available. If it isn't available kernel log buffer
contains it.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Signal code uses r3 value which saved in restore_sigcontext to
rt_sigframe but it require to be zeroed. If is not zero rt_sigframe
contains wrong values.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Do not save return registers before rt_sigreturn is called.
_user_exception(syscall handler) already setup return address
that's why it is removed from rt_sigreturn_wrapper.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Old gdb uses priviledged exception handler to handle
gdb exception. New gdb uses brki r16, 0x18 that's why
we can remove old gdb support.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
I forget to remove unused variable from kgdb_arch_handle_exception.
Fix return value in microblaze_kgdb_break function.
Error log:
arch/microblaze/kernel/kgdb.c: In function 'microblaze_kgdb_break':
arch/microblaze/kernel/kgdb.c:83: warning: 'return' with a value, in function returning void
arch/microblaze/kernel/kgdb.c: In function 'kgdb_arch_handle_exception':
arch/microblaze/kernel/kgdb.c:119: warning: unused variable 'cpu'
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
* 'merge-devicetree' of git://git.secretlab.ca/git/linux-2.6:
spi.h: missing kernel-doc notation, please fix
of: fix missing headers for of_address_to_resource() in MTD and SysACE drivers
of: Fix missing includes
ata: update for of_device to platform_device replacement
microblaze: Fix of: eliminate of_device->node and dev_archdata->{of,prom}_node
microblaze: Fix of/address: Merge all of the bus translation code
booting-without-of: Remove nonexistent chapters from TOC, fix numbering
|
|
Make do_execve() take a const filename pointer so that kernel_execve() compiles
correctly on ARM:
arch/arm/kernel/sys_arm.c:88: warning: passing argument 1 of 'do_execve' discards qualifiers from pointer target type
This also requires the argv and envp arguments to be consted twice, once for
the pointer array and once for the strings the array points to. This is
because do_execve() passes a pointer to the filename (now const) to
copy_strings_kernel(). A simpler alternative would be to cast the filename
pointer in do_execve() when it's passed to copy_strings_kernel().
do_execve() may not change any of the strings it is passed as part of the argv
or envp lists as they are some of them in .rodata, so marking these strings as
const should be fine.
Further kernel_execve() and sys_execve() need to be changed to match.
This has been test built on x86_64, frv, arm and mips.
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Ralf Baechle <ralf@linux-mips.org>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Commit dbbdee94734bf6f1db7af42008a53655e77cab8f removed
of_irq_pci_swizzle but didn't use pci_swizzle_interrupt_pin
instead.
Signed-off-by: Michal Simek <monstr@monstr.eu>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
|
|
Mark arguments to certain system calls as being const where they should be but
aren't. The list includes:
(*) The filename arguments of various stat syscalls, execve(), various utimes
syscalls and some mount syscalls.
(*) The filename arguments of some syscall helpers relating to the above.
(*) The buffer argument of various write syscalls.
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
* 'next-devicetree' of git://git.secretlab.ca/git/linux-2.6: (63 commits)
of/platform: Register of_platform_drivers with an "of:" prefix
of/address: Clean up function declarations
of/spi: call of_register_spi_devices() from spi core code
of: Provide default of_node_to_nid() implementation.
of/device: Make of_device_make_bus_id() usable by other code.
of/irq: Fix endian issues in parsing interrupt specifiers
of: Fix phandle endian issues
of/flattree: fix of_flat_dt_is_compatible() to match the full compatible string
of: remove of_default_bus_ids
of: make of_find_device_by_node generic
microblaze: remove references to of_device and to_of_device
sparc: remove references to of_device and to_of_device
powerpc: remove references to of_device and to_of_device
of/device: Replace of_device with platform_device in includes and core code
of/device: Protect against binding of_platform_drivers to non-OF devices
of: remove asm/of_device.h
of: remove asm/of_platform.h
of/platform: remove all of_bus_type and of_platform_bus_type references
of: Merge of_platform_bus_type with platform_bus_type
drivercore/of: Add OF style matching to platform bus
...
Fix up trivial conflicts in arch/microblaze/kernel/Makefile due to just
some obj-y removals by the devicetree branch, while the microblaze
updates added a new file.
|
|
Kgdb uses brki r16, 0x18 instruction to call
low level _debug_exception function which save
current state to pt_regs and call microblaze_kgdb_break
function. _debug_exception should be called only from
the kernel space. User space calling is not supported
because user application debugging uses different handling.
pt_regs_to_gdb_regs loads additional special registers
which can't be changed
* Enable KGDB in Kconfig
* Remove ancient not-tested KGDB support
* Remove ancient _debug_exception code from entry.S
Only MMU KGDB support is supported.
Signed-off-by: Michal Simek <monstr@monstr.eu>
CC: Jason Wessel <jason.wessel@windriver.com>
CC: John Williams <john.williams@petalogix.com>
CC: Edgar E. Iglesias <edgar.iglesias@petalogix.com>
CC: linux-kernel@vger.kernel.org
Acked-by: Jason Wessel <jason.wessel@windriver.com>
|
|
This is the first patch which add support for
user application debugging through brki rX, 0x18 vector.
This patch has side effect which also remove security issue
to use brki rX, 0x18 to freeze kernel.
Support for old gdb support via priviledged exception
(brk r0, r0) is still there. It will be remove in future.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
We need to save instruction and the latest Microblaze shouldn't
have any problem with it.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Syscall can be called only from userspace that's why
we don't need to check which space kernel come from.
Kernel syscall calling is not check and shouldn't come
throught this part of code.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
We can save one more instruction if PT_MODE is saved in delay slot
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Save instructions by using delay slot and
clear UMS only if kernel comes from user space.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Saving some instructions. Clear VMS bit if kernel comes
from kernel space.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Saving instructions by adding 2/3 addik instructions to one.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Saving instruction with delay slot usage.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
This change save one instruction if kernel comes from kernel
space.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Separate reg saving and mode setting.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
SAVE_STATE macro could be used by other rutines too.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
We are not working with values from MSR that's why
we can discard it and use r11 for different purpose without
saving/restoring.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Remove set_vms because UMS is cleared and VMS is already setup.
Optimize function calling which save one additional instruction.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
VMS is always setup because VM mode was before
exception/syscall/interrupt. Kernel continues in kernel mode
that's why we have to clear UMS bit if kernel comes from
user space.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
PT_MODE stores information if kernel comes from user
or kernel space. If come from user space, PT_MODE
contains 0. If come from kernel store, PT_MODE contains
non zero value. We don't need to save value 1. I am using
r1 register which contains non zero value.
This change save one additional instruction.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
SAVE_STATE macro could be used for user_exception
or interrupt functions.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
We don't need to save r0 to PT_R0. It could be additional
operation.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
We don't need to save R11 register. There is easy way
to use only R1 which is saved and restore later.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
BIP is already setup.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
Keep together all arguments for send_sig function.
Move returning address to delay slot which is executed.
Remove additional send_sig loading. I am using IMM part of
rtbd instruction with r0.
old solution:
addik r11, r0, send_sig
rtbd r11, 0
nop
new solution:
rtbd r0, send_sig
nop
There is one instruction saving.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
|
It is necessary to setup BIP and EE and clear EIP
only for unaligned exception handler. The rest of
hw exception handlers don't require it.
HW exception occured and we are not in virtual mode.
That's why we can do operations protected by EIP.
Interrupt, next hw exception or syscall can't occur.
EIP is cleared by rted.
This change speedup page_fault hw exception handler
which is critical path.
There is also necessary to save R11 content before
flag setup for unaligned exception.
Signed-off-by: Michal Simek <monstr@monstr.eu>
|
