linux/include/asm-s390/setup.h, branch v2.6.26

[S390] System z large page support.

2008-04-30T11:38:47Z

This adds hugetlbfs support on System z, using both hardware large page support if available and software large page emulation on older hardware. Shared (large) page tables are implemented in software emulation mode, by using page->index of the first tail page from a compound large page to store page table information. Signed-off-by: Gerald Schaefer Signed-off-by: Martin Schwidefsky

[S390] Convert machine feature detection code to C.

2008-04-30T11:38:47Z

From: Heiko Carstens From: Carsten Otte This lets us use defines for the magic bits in machine flags instead of using plain numbers all over the place. In addition on newer machines features/facilities are indicated by the result of the stfl instruction. So we use these bits instead of trying to execute new instructions and check wether we get an exception or not. Also the mvpg instruction is always available when in zArch mode, whereas the idte instruction is only available in zArch mode. This results in some minor optimizations. Signed-off-by: Heiko Carstens Signed-off-by: Carsten Otte Signed-off-by: Martin Schwidefsky

s390: KVM guest: detect when running on kvm

2008-04-27T09:00:50Z

This patch adds functionality to detect if the kernel runs under the KVM hypervisor. A macro MACHINE_IS_KVM is exported for device drivers. This allows drivers to skip device detection if the systems runs non-virtualized. We also define a preferred console to avoid having the ttyS0, which is a line mode only console. Signed-off-by: Christian Borntraeger Acked-by: Martin Schwidefsky Signed-off-by: Carsten Otte Signed-off-by: Avi Kivity

[S390] zfcpdump support.

2007-04-27T14:01:44Z

s390 machines provide hardware support for creating Linux dumps on SCSI disks. For creating a dump a special purpose dump Linux is used. The first 32 MB of memory are saved by the hardware before the dump Linux is booted. Via an SCLP interface, the saved memory can be accessed from Linux. This patch exports memory and registers of the crashed Linux to userspace via a debugfs file. For more information refer to Documentation/s390/zfcpdump.txt, which is included in this patch. Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky Signed-off-by: Heiko Carstens

[S390] New header file ipl.h

2007-02-21T09:55:21Z

Setup.h has been misused for ipl related stuff in the past. We now move everything, which has to do with ipl and reipl to a new header file named "ipl.h". Signed-off-by: Michael Holzheu Signed-off-by: Martin Schwidefsky

[S390] boot from NSS support

2007-02-05T20:18:24Z

Add support to boot from a named saved segment (NSS). Signed-off-by: Hongjie Yang Signed-off-by: Martin Schwidefsky

[S390] noexec protection

2007-02-05T20:18:17Z

This provides a noexec protection on s390 hardware. Our hardware does not have any bits left in the pte for a hw noexec bit, so this is a different approach using shadow page tables and a special addressing mode that allows separate address spaces for code and data. As a special feature of our "secondary-space" addressing mode, separate page tables can be specified for the translation of data addresses (storage operands) and instruction addresses. The shadow page table is used for the instruction addresses and the standard page table for the data addresses. The shadow page table is linked to the standard page table by a pointer in page->lru.next of the struct page corresponding to the page that contains the standard page table (since page->private is not really private with the pte_lock and the page table pages are not in the LRU list). Depending on the software bits of a pte, it is either inserted into both page tables or just into the standard (data) page table. Pages of a vma that does not have the VM_EXEC bit set get mapped only in the data address space. Any try to execute code on such a page will cause a page translation exception. The standard reaction to this is a SIGSEGV with two exceptions: the two system call opcodes 0x0a77 (sys_sigreturn) and 0x0aad (sys_rt_sigreturn) are allowed. They are stored by the kernel to the signal stack frame. Unfortunately, the signal return mechanism cannot be modified to use an SA_RESTORER because the exception unwinding code depends on the system call opcode stored behind the signal stack frame. This feature requires that user space is executed in secondary-space mode and the kernel in home-space mode, which means that the addressing modes need to be switched and that the noexec protection only works for user space. After switching the addressing modes, we cannot use the mvcp/mvcs instructions anymore to copy between kernel and user space. A new mvcos instruction has been added to the z9 EC/BC hardware which allows to copy between arbitrary address spaces, but on older hardware the page tables need to be walked manually. Signed-off-by: Gerald Schaefer Signed-off-by: Martin Schwidefsky

[S390] Get rid of a lot of sparse warnings.

2007-02-05T20:16:47Z

Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

[PATCH] cleanup asm/setup.h userspace visibility

2006-12-07T16:39:46Z

Make the contents of the userspace asm/setup.h header consistent on all architectures: - export setup.h to userspace on all architectures - export only COMMAND_LINE_SIZE to userspace - frv: move COMMAND_LINE_SIZE from param.h - i386: remove duplicate COMMAND_LINE_SIZE from param.h - arm: - export ATAGs to userspace - change u8/u16/u32 to __u8/__u16/__u32 Signed-off-by: Adrian Bunk Acked-by: Russell King Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

[S390] Cleanup memory_chunk array usage.

2006-12-04T14:40:38Z

Need this at yet another file and don't want to add yet another extern... Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky