linux-toradex.git/include/asm-s390/setup.h, branch v2.6.24.2

[S390] zfcpdump support.

2007-04-27T14:01:44+00:00

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

2007-02-21T09:55:21+00:00

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

2007-02-05T20:18:24+00:00

Add support to boot from a named saved segment (NSS).

Signed-off-by: Hongjie Yang 
Signed-off-by: Martin Schwidefsky

[S390] noexec protection

2007-02-05T20:18:17+00:00

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.

2007-02-05T20:16:47+00:00

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

[PATCH] cleanup asm/setup.h userspace visibility

2006-12-07T16:39:46+00:00

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.

2006-12-04T14:40:38+00:00

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

[PATCH] Directed yield: direct yield of spinlocks for s390.

2006-10-01T07:39:22+00:00

Use the new diagnose 0x9c in the spinlock implementation for s390.  It
yields the remaining timeslice of the virtual cpu that tries to acquire a
lock to the virtual cpu that is the current holder of the lock.

Signed-off-by: Martin Schwidefsky 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[S390] Use alternative user-copy operations for new hardware.

2006-09-20T13:59:44+00:00

This introduces new user-copy operations which are optimized for
copying more than 256 Bytes on new hardware.

Signed-off-by: Gerald Schaefer 
Signed-off-by: Martin Schwidefsky

[S390] convert some assembler to C.

2006-09-20T13:59:15+00:00

Convert GET_IPL_DEVICE assembler macro to C function.

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