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* Reorder guest saved regs to match hyperall orderJes Sorensen2007-10-23
| | | | | | | | | | | | | Move eax next to ebx/ecx/edx in struct lguest_regs on i386, so they will be located together and allow it to map directly to a struct hcall_ring entry (which will be renamed struct hcall_args as in a subsequent patch). This is in preparation for making the code hcall code architecture independent. Signed-off-by: Jes Sorensen <jes@sgi.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Move i386 part of core.c to x86/core.c.Jes Sorensen2007-10-23
| | | | | | | | Separate i386 architecture specific from core.c and move it to x86/core.c and add x86/lguest.h header file to match. Signed-off-by: Jes Sorensen <jes@sgi.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Make shadow IDT a complete IDT with 256 entries.Rusty Russell2007-10-23
| | | | | | | This simplifies the code a little, in preparation for allowing alternate system call vectors in guests (Plan 9 uses 0x40). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Remove fixed limit on number of guests, and lguests array.Rusty Russell2007-10-23
| | | | | | | | | | | Back when we had all the Guest state in the switcher, we had a fixed array of them. This is no longer necessary. If we switch the network code to using random_ether_addr (46 bits is enough to avoid clashes), we can get rid of the concept of "guest id" altogether. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Introduce guest mem offset, static link example launcherRusty Russell2007-10-23
| | | | | | | | | | | In order to avoid problematic special linking of the Launcher, we give the Host an offset: this means we can use any memory region in the Launcher as Guest memory rather than insisting on mmap() at 0. The result is quite pleasing: a number of casts are replaced with simple additions. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Rename switcher.S to x86/switcher_32.SRusty Russell2007-10-23
| | | | | | | | lguest uses a "switcher" shim mapped high to bounce between host and guest. As lguest becomes less i386-centric, we separate this code into a subdir. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Move lguest guest support to arch/x86.Rusty Russell2007-10-23
| | | | | | | | | Lguest has two sides: host support (to launch guests) and guest support (replacement boot path and paravirt_ops). This moves the guest side to arch/x86/lguest where it's closer to related code. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Andi Kleen <ak@suse.de>
* Clocksource is continuous regardless of the state of the host's TSC.Tony Breeds2007-10-23
| | | | | | | | | | | Currently lguest will spend a lot of of time waking up the host, as it cannot go tickless (if the [host] TSC has been marked unstable). On my laptop I was getting ~40% of wakeups from lguest. With this patch applied, my laptop is much happier! Signed-off-by: Tony Breeds <tony@bakeyournoodle.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* lguest_devices belongs in lguest_bus.c: it's not i386-specific.Rusty Russell2007-10-23
| | | | Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Lguest currently depends on 32-bit x86, not just x86.Rusty Russell2007-10-23
| | | | Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Use copy_to_user() not put_user for struct timespecJes Sorensen2007-10-23
| | | | | | | | | | Use copy_to_user() when copying a struct timespec to the guest - put_user() cannot handle two long's in one go on a 64bit arch. Signed-off-by: Jes Sorensen <jes@sgi.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Jes Sorensen <jes@sgi.com> Cc: Al Viro <viro@ftp.linux.org.uk>
* Remove binfmts.h include from lg.hRusty Russell2007-10-23
| | | | | | It wasn't needed since a very early prototype of lguest. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
* Consolidate host virtualization support under Virtualization menuRusty Russell2007-10-23
| | | | | | | Move lguest under the virtualization menu. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Avi Kivity <avi@qumranet.com>
* Normalize config options for guest supportRusty Russell2007-10-23
| | | | | | | | | | | | | 1) Group all the "guest OS" support options together, under a PARAVIRT_GUEST menu. 2) Make those options select CONFIG_PARAVIRT, as suggested by Andi. 3) Make kconfig help titles consistent. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Andi Kleen <ak@suse.de> Cc: Zach Amsden <zach@vmware.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Chris Wright <chrisw@sous-sol.org>
* Merge branch 'for-linus' of ↵Linus Torvalds2007-10-22
|\ | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: appletouch - apply idle reset logic to all touchpads Input: usbtouchscreen - add support for GoTop tablet devices Input: bf54x-keys - return real error when request_irq() fails Input: i8042 - export i8042_command()
| * Input: appletouch - apply idle reset logic to all touchpadsAnton Ekblad2007-10-22
| | | | | | | | | | | | | | | | | | | | Not only Geyser 3 but also Geyser 1 need to be reset after they become idle to stop them from needlessly waking up the kernel. Do idle reset on all touchpads, regardless of their version - if we see 10 empty packets the touchpad needs to be reset; good touchpads should not send empty packets anyway. Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
| * Input: usbtouchscreen - add support for GoTop tablet devicesJerrold Jones2007-10-22
| | | | | | | | | | | | | | | | Add support for GoTop Super_Q2/GogoPen/PenPower tablets to usbtouchscreen. Protocol discovery was done by Yick Yan Lam. Signed-off-by: Daniel Ritz <daniel.ritz@gmx.ch> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
| * Input: bf54x-keys - return real error when request_irq() failsMichael Hennerich2007-10-22
| | | | | | | | | | | | Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
| * Input: i8042 - export i8042_command()Márton Németh2007-10-22
| | | | | | | | | | | | | | | | | | Export the i8042_command() function which manages the mutual exclusion with the help of the i8042_lock spinlock. This allows to access i8042 safely from other parts of the kernel. Signed-off-by: Márton Németh <nm127@freemail.hu> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
* | Merge branch 'for-linus' of ↵Linus Torvalds2007-10-22
|\ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/avi/kvm: KVM: Use new smp_call_function_mask() in kvm_flush_remote_tlbs() sched: don't clear PF_VCPU in scheduler KVM: Improve local apic timer wraparound handling KVM: Fix local apic timer divide by zero KVM: Move kvm_guest_exit() after local_irq_enable() KVM: x86 emulator: fix access registers for instructions with ModR/M byte and Mod = 3 KVM: VMX: Force vm86 mode if setting flags during real mode KVM: x86 emulator: implement 'movnti mem, reg' KVM: VMX: Reset mmu context when entering real mode KVM: VMX: Handle NMIs before enabling interrupts and preemption KVM: MMU: Set shadow pte atomically in mmu_pte_write_zap_pte() KVM: x86 emulator: fix repne/repnz decoding KVM: x86 emulator: fix merge screwup due to emulator split
| * | KVM: Use new smp_call_function_mask() in kvm_flush_remote_tlbs()Laurent Vivier2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | In kvm_flush_remote_tlbs(), replace a loop using smp_call_function_single() by a single call to smp_call_function_mask() (which is new for x86_64). Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | KVM: Improve local apic timer wraparound handlingKevin Pedretti2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Better handle wrap-around cases when reading the APIC CCR (current count register). Also, if ICR is 0, CCR should also be 0... previously reading CCR before setting ICR would result in a large kinda-random number. Signed-off-by: Kevin Pedretti <kevin.pedretti@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | KVM: Fix local apic timer divide by zeroKevin Pedretti2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | kvm_lapic_reset() was initializing apic->timer.divide_count to 0, which could potentially lead to a divide by zero error in apic_get_tmcct(). Any guest that reads the APIC's CCR (current count) register before setting DCR (divide configuration) would trigger a divide by zero exception in the host kernel, leading to a host-OS crash. This patch results in apic->timer.divide_count being initialized to 2 at reset, eliminating the bug (DCR=0 at reset, meaning divide by 2). Signed-off-by: Kevin Pedretti <kevin.pedretti@gmail.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | KVM: Move kvm_guest_exit() after local_irq_enable()Laurent Vivier2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | We need to make sure that the timer interrupt happens before we clear PF_VCPU, so the accounting code actually sees guest mode. http://lkml.org/lkml/2007/10/15/114 Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | KVM: x86 emulator: fix access registers for instructions with ModR/M byte ↵Aurelien Jarno2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | and Mod = 3 The patch belows changes the access type to register from memory for instructions that are declared as SrcMem or DstMem, but have a ModR/M byte with Mod = 3. It fixes (at least) the lmsw and smsw instructions on an AMD64 CPU, which are needed for FreeBSD. Signed-off-by: Aurelien Jarno <aurelien@aurel32.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | KVM: VMX: Force vm86 mode if setting flags during real modeAvi Kivity2007-10-22
| | | | | | | | | | | | | | | | | | | | | When resetting from userspace, we need to handle the flags being cleared even after we are in real mode. Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | KVM: x86 emulator: implement 'movnti mem, reg'Sheng Yang2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | Implement emulation of instruction: movnti m32/m64, r32/r64 opcode: 0x0f 0xc3 Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | KVM: VMX: Reset mmu context when entering real modeEddie Dong2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Resetting an SMP guest will force AP enter real mode (RESET) with paging enabled in protected mode. While current enter_rmode() can only handle mode switch from nonpaging mode to real mode which leads to SMP reboot failure. Fix by reloading the mmu context on entering real mode. Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com> Signed-off-by: Qing He <qing.he@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | KVM: VMX: Handle NMIs before enabling interrupts and preemptionAvi Kivity2007-10-22
| | | | | | | | | | | | | | | | | | | | | This makes sure we handle NMI on the current cpu, and that we don't service maskable interrupts before non-maskable ones. Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | KVM: MMU: Set shadow pte atomically in mmu_pte_write_zap_pte()Izik Eidus2007-10-22
| | | | | | | | | | | | | | | | | | | | | Setting shadow page table entry should be set atomicly using set_shadow_pte(). Signed-off-by: Izik Eidus <izike@qumranet.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | KVM: x86 emulator: fix repne/repnz decodingLaurent Vivier2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The repnz/repne instructions must set rep_prefix to 1 like rep/repe/repz. This patch correct the disk probe problem met with OpenBSD. This issue appears with commit e70669abd4e60dfea3ac1639848e20e2b8dd1255 because before it, the decoding was done internally to kvm and after it is done by x86_emulate.c (which doesn't do it correctly). Signed-off-by: Laurent Vivier <Laurent.Vivier@bull.net> Signed-off-by: Avi Kivity <avi@qumranet.com>
| * | KVM: x86 emulator: fix merge screwup due to emulator splitNitin A Kamble2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | This code has gone to wrong place in the file. Moving it back to right location. Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
* | | Merge branch 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6Linus Torvalds2007-10-22
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 'for-linus' of git://git390.osdl.marist.edu/pub/scm/linux-2.6: [S390] 4level-fixup cleanup [S390] Cleanup page table definitions. [S390] Introduce follow_table in uaccess_pt.c [S390] Remove unused user_seg from thread structure. [S390] tlb flush fix. [S390] kernel: Fix dump on panic for DASDs under LPAR. [S390] struct class_device -> struct device conversion. [S390] cio: Fix incomplete commit for uevent suppression. [S390] cio: Use to_channelpath() for device to channel path conversion. [S390] Add per-cpu idle time / idle count sysfs attributes. [S390] Update default configuration.
| * | | [S390] struct class_device -> struct device conversion.Cornelia Huck2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Convert struct class_device users under drivers/s390/char to use struct device. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * | | [S390] cio: Fix incomplete commit for uevent suppression.Cornelia Huck2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit fa1a8c23eb7d3ded8a3c6d0e653339a2bc7fca9e intended to introduce uevent suppression for subchannels, but half of it was lost somewhere. Now, we end up with two uevents for every registered subchannel :( So we should better add the missing part from http://marc.info/?l=linux-kernel&m=117515953113974&w=2. Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| * | | [S390] cio: Use to_channelpath() for device to channel path conversion.Cornelia Huck2007-10-22
| |/ / | | | | | | | | | | | | | | | | | | We already have a macro for that, so let's use it consistently... Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
* | | Merge branch 'master' of ↵Linus Torvalds2007-10-22
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 * 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6: (30 commits) [IPSEC] IPV6: Fix to add tunnel mode SA correctly. [NET]: Cut off the queue_mapping field from sk_buff [NET]: Hide the queue_mapping field inside netif_subqueue_stopped [NET]: Make and use skb_get_queue_mapping [NET]: Use the skb_set_queue_mapping where appropriate [INET]: Use MODULE_ALIAS_NET_PF_PROTO_TYPE where possible. [INET]: Let inet_diag and friends autoload [NIU]: Cleanup PAGE_SIZE checks a bit [NET]: Fix SKB_WITH_OVERHEAD calculation [ATM]: Fix clip module reload crash. [TG3]: Update version to 3.85 [TG3]: PCI command adjustment [TG3]: Add management FW version to ethtool report [TG3]: Add 5723 support [Bluetooth] Convert RFCOMM to use kthread API [Bluetooth] Add constant for Bluetooth socket options level [Bluetooth] Add support for handling simple eSCO links [Bluetooth] Add address and channel attribute to RFCOMM TTY device [Bluetooth] Fix wrong argument in debug code of HIDP [Bluetooth] Add generic driver for Bluetooth USB devices ...
| * | | [NET]: Make and use skb_get_queue_mappingPavel Emelyanov2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Make the helper for getting the field, symmetrical to the "set" one. Return 0 if CONFIG_NETDEVICES_MULTIQUEUE=n Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | [NIU]: Cleanup PAGE_SIZE checks a bitOlof Johansson2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | I get the following warning from a powerpc allyesconfig of current mainline: drivers/net/niu.c: In function 'niu_size_rbr': drivers/net/niu.c:3113: warning: large integer implicitly truncated to unsigned type PAGE_SIZE in this case is 64KB, so I don't quite get why gcc can't tell that the line in question will never be reached. I suggest the following instead, but I can unfortunately not do anything but build test it. Also, the driver does some other checks to make sure that PAGE_SIZE is a power of two (BUILD_BUG_ON() in niu_init()), doesn't seem like that could ever be untrue? Or are there really archs with non-power-of-two PAGE_SIZE? Signed-off-by: Olof Johansson <olof@lixom.net> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | [TG3]: Update version to 3.85Matt Carlson2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch updates the version number to 3.85. Signed-off-by: Matt Carlson <mcarlson@broadcom.com> Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | [TG3]: PCI command adjustmentMatt Carlson2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch changes the way the driver works with the PCI command register. It adjusts the access size from dwords to words. This patch is done both as a PCI configuration space cleanup and as preparatory work for PCI error recovery. Signed-off-by: Matt Carlson <mcarlson@broadcom.com> Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | [TG3]: Add management FW version to ethtool reportMatt Carlson2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch appends the management firmware version to the bootcode firmware string reported through ethtool. Signed-off-by: Matt Carlson <mcarlson@broadcom.com> Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | [TG3]: Add 5723 supportMatt Carlson2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds support for upcoming 5723 devices. Signed-off-by: Matt Carlson <mcarlson@broadcom.com> Signed-off-by: Michael Chan <mchan@broadcom.com> Signed-off-by: David S. Miller <davem@davemloft.net>
| * | | [Bluetooth] Add generic driver for Bluetooth USB devicesMarcel Holtmann2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds a new generic driver for Bluetooth USB devices. This driver is still experimental at this point, but it is cleaner and easier to maintain than the current Bluetooth USB driver. It is a much better starting point for power management improvements. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
| * | | [Bluetooth] Add generic driver for Bluetooth SDIO devicesMarcel Holtmann2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch adds a generic driver for Bluetooth SDIO devices. It supports Type-A and Type-B devices. Signed-off-by: David Vrabel <david.vrabel@csr.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
| * | | [Bluetooth] Eliminate checks for impossible conditions in IRQ handlerJeff Garzik2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Our info structure and info->hdev is always passed to the IRQ handler, so we don't have to worry about these checks in every interrupt. Leave a BUG_ON() just to help unwary programmers, but these could probably be removed as well. Signed-off-by: Jeff Garzik <jgarzik@redhat.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
| * | | [Bluetooth] Add UART driver for Texas Instruments' BRF63xx chipsOhad Ben-Cohen2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Add support for Texas Instruments' HCI Low Level (HCILL) Bluetooth protocol, which is a power management extension to H4. The HCILL is widely used by TI's BRF63xx Bluetooth chips. Signed-off-by: Ohad Ben-Cohen <ohad@bencohen.org> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
| * | | [Bluetooth] Change BPA 100/105 driver to use USB anchorsMarcel Holtmann2007-10-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | With the new support for USB anchors the driver can become more simpler and also cleaner. This patch switches to the usage of USB anchors for all URBs. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
| * | | [Bluetooth] Switch from OGF+OCF to using only opcodesMarcel Holtmann2007-10-22
| |/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The Bluetooth HCI commands are divided into logical OGF groups for easier identification of their purposes. While this still makes sense for the written specification, its makes the code only more complex and harder to read. So instead of using separate OGF and OCF values to identify the commands, use a common 16-bit opcode that combines both values. As a side effect this also reduces the complexity of OGF and OCF calculations during command header parsing. Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
* | | Merge branch 'master' of ↵Linus Torvalds2007-10-22
|\ \ \ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc * 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc: [POWERPC] Enable restart support for lite5200 board [POWERPC] Add restart support for mpc52xx based platforms [POWERPC] Update device tree binding for mpc5200 gpt [POWERPC] Add mpc52xx_find_and_map_path(), refactor utility functions [POWERPC] bestcomm: Restrict bus prefetch bugfix to original mpc5200 silicon.
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