linux/include/asm-powerpc/processor.h, branch v2.6.19

[POWERPC] Add briq support to CHRP

2006-07-07T10:19:15Z

The support for Briq machines has been floating around as patches for ages. This cleans it up and adds it once for all. Some of this is based on initial code provided by Karsten Jeppesen and mostly rewritten from scratch by me. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras

[POWERPC] disable floating point exceptions for init

2006-06-21T05:01:33Z

Floating point exceptions should not be enabled by default, as this setting impacts the performance on some CPUs, in particular the Cell BE. Since the bits are inherited from parent processes, the place to change the default is the thread struct used for init. glibc sets this up correctly per thread in its fesetenv function, so user space should not be impacted by this setting. None of the other common libc implementations (uClibc, dietlibc, newlib, klibc) has support for fp exceptions, so they are unlikely to be hit by this either. There is a small risk that somebody wrote their own application that manually sets the fpscr bits instead of calling fesetenv, without changing the MSR bits as well. Those programs will break with this change. It probably makes sense to change glibc in the future to be more clever about FE bits, so that when running on a CPU where this is expensive, it disables exceptions ASAP, while it keeps them enabled on CPUs where running with exceptions on is cheaper than changing the state often. Signed-off-by: Arnd Bergmann Signed-off-by: Paul Mackerras

[PATCH] powerpc: Implement PR_[GS]ET_UNALIGN prctls for powerpc

2006-06-09T11:24:16Z

This gives the ability to control whether alignment exceptions get fixed up or reported to the process as a SIGBUS, using the existing PR_SET_UNALIGN and PR_GET_UNALIGN prctls. We do not implement the option of logging a message on alignment exceptions. Signed-off-by: Paul Mackerras

[PATCH] powerpc: Implement support for setting little-endian mode via prctl

2006-06-09T11:24:15Z

This adds the PowerPC part of the code to allow processes to change their endian mode via prctl. This also extends the alignment exception handler to be able to fix up alignment exceptions that occur in little-endian mode, both for "PowerPC" little-endian and true little-endian. We always enter signal handlers in big-endian mode -- the support for little-endian mode does not amount to the creation of a little-endian user/kernel ABI. If the signal handler returns, the endian mode is restored to what it was when the signal was delivered. We have two new kernel CPU feature bits, one for PPC little-endian and one for true little-endian. Most of the classic 32-bit processors support PPC little-endian, and this is reflected in the CPU feature table. There are two corresponding feature bits reported to userland in the AT_HWCAP aux vector entry. This is based on an earlier patch by Anton Blanchard. Signed-off-by: Paul Mackerras

[PATCH] powerpc vdso updates

2006-06-09T11:20:57Z

This patch cleans up some locking & error handling in the ppc vdso and moves the vdso base pointer from the thread struct to the mm context where it more logically belongs. It brings the powerpc implementation closer to Ingo's new x86 one and also adds an arch_vma_name() function allowing to print [vsdo] in /proc//maps if Ingo's x86 vdso patch is also applied. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras

[PATCH] powerpc: Kill _machine and hard-coded platform numbers

2006-03-28T12:15:54Z

This removes statically assigned platform numbers and reworks the powerpc platform probe code to use a better mechanism. With this, board support files can simply declare a new machine type with a macro, and implement a probe() function that uses the flattened device-tree to detect if they apply for a given machine. We now have a machine_is() macro that replaces the comparisons of _machine with the various PLATFORM_* constants. This commit also changes various drivers to use the new macro instead of looking at _machine. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: Paul Mackerras

[PATCH] powerpc: export validate_sp for oprofile calltrace

2006-03-28T05:19:52Z

Export validate_sp so we can use it in the oprofile calltrace code. Signed-off-by: Anton Blanchard Signed-off-by: Paul Mackerras

ppc: Remove CHRP, POWER3 and POWER4 support from arch/ppc

2006-03-27T23:22:10Z

32-bit CHRP machines are now supported only in arch/powerpc, as are all 64-bit PowerPC processors. This means that we don't use Open Firmware on any platform in arch/ppc any more. This makes PReP support a single-platform option like every other platform support option in arch/ppc now, thus CONFIG_PPC_MULTIPLATFORM is gone from arch/ppc. CONFIG_PPC_PREP is the option that selects PReP support and is generally what has replaced CONFIG_PPC_MULTIPLATFORM within arch/ppc. _machine is all but dead now, being #defined to 0. Updated Makefiles, comments and Kconfig options generally to reflect these changes. Signed-off-by: Paul Mackerras

[PATCH] powerpc: Replace platform_is_lpar() with a firmware feature

2006-03-22T04:04:17Z

It has been decreed that platform numbers are evil, so as a step in that direction, replace platform_is_lpar() with a FW_FEATURE_LPAR bit. Currently FW_FEATURE_LPAR really means i/pSeries LPAR, in the future we might have to clean that up if we need to be more specific about what LPAR actually means. But that's another patch ... Signed-off-by: Michael Ellerman Signed-off-by: Paul Mackerras

[PATCH] powerpc: sanitize header files for user space includes

2006-01-09T04:13:08Z

include/asm-ppc/ had #ifdef __KERNEL__ in all header files that are not meant for use by user space, include/asm-powerpc does not have this yet. This patch gets us a lot closer there. There are a few cases where I was not sure, so I left them out. I have verified that no CONFIG_* symbols are used outside of __KERNEL__ any more and that there are no obvious compile errors when including any of the headers in user space libraries. Signed-off-by: Arnd Bergmann Signed-off-by: Paul Mackerras