linux-toradex.git/arch/s390/kernel/setup.c, branch v3.0.4

[S390] Remove data execution protection

2011-05-23T08:24:28+00:00

The noexec support on s390 does not rely on a bit in the page table
entry but utilizes the secondary space mode to distinguish between
memory accesses for instructions vs. data. The noexec code relies
on the assumption that the cpu will always use the secondary space
page table for data accesses while it is running in the secondary
space mode. Up to the z9-109 class machines this has been the case.
Unfortunately this is not true anymore with z10 and later machines.
The load-relative-long instructions lrl, lgrl and lgfrl access the
memory operand using the same addressing-space mode that has been
used to fetch the instruction.
This breaks the noexec mode for all user space binaries compiled
with march=z10 or later. The only option is to remove the current
noexec support.

Signed-off-by: Martin Schwidefsky

Fix common misspellings

2011-03-31T14:26:23+00:00

Fixes generated by 'codespell' and manually reviewed.

Signed-off-by: Lucas De Marchi

[S390] setup: register bss section as resource

2011-03-23T09:15:59+00:00

Make kernel bss section visible via /proc/iomem like on other
architectures.

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

[S390] setup: simplify setup_resources()

2011-03-23T09:15:59+00:00

Simplify setup_resources() and make it more generic. That way it is
easier to add additional resources.

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

[S390] Add z196 machine type to setup_hwcaps

2010-10-29T14:50:49+00:00

Add machine type for zEnterprise 196 to elf platform detection.

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

[S390] cleanup facility list handling

2010-10-25T14:10:21+00:00

Store the facility list once at system startup with stfl/stfle and
reuse the result for all facility tests.

Signed-off-by: Martin Schwidefsky

[S390] add support for nonquiescing sske

2010-10-25T14:10:15+00:00

Improve performance of the sske operation by using the nonquiescing
variant if the affected page has no mappings established. On machines
with no support for the new sske variant the mask bit will be ignored.

Signed-off-by: Martin Schwidefsky

[S390] spp: fix compilation for CONFIG_32BIT

2010-05-26T21:26:29+00:00

Fix build breakage for CONFIG_32BIT caused by cd3b70f5
"[S390] virtualization aware cpu measurement"

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

[S390] virtualization aware cpu measurement

2010-05-17T08:00:15+00:00

Use the SPP instruction to set a tag on entry to / exit of the virtual
machine context. This allows the cpu measurement facility to distinguish
the samples from the host and the different guests.

Signed-off-by: Carsten Otte

[S390] improve irq tracing code in entry[64].S

2010-05-17T08:00:15+00:00

The system call path in entry[64].S is run with interrupts enabled.
Remove the irq tracing check from the system call exit code. If a
program check interrupted a context enabled for interrupts do a
call to trace_irq_off_caller in the program check handler before
branching to the system call exit code.
Restructure the system call and io interrupt return code to avoid
avoid the lpsw[e] to disable machine checks.

Signed-off-by: Martin Schwidefsky