linux-toradex.git/arch/powerpc/include/asm/ppc_asm.h, branch v3.4.18

powerpc: Fix register clobbering when accumulating stolen time

2012-03-08T23:55:16+00:00

When running under a hypervisor that supports stolen time accounting,
we may call C code from the macro EXCEPTION_PROLOG_COMMON in the
exception entry path, which clobbers CR0.

However, the FPU and vector traps rely on CR0 indicating whether we
are coming from userspace or kernel to decide what to do.

So we need to restore that value after the C call

Signed-off-by: Benjamin Herrenschmidt

powerpc/e500: SPE register saving: take arbitrary struct offset

2011-07-12T10:16:31+00:00

Previously, these macros hardcoded THREAD_EVR0 as the base of the save
area, relative to the base register passed.  This base offset is now
passed as a separate macro parameter, allowing reuse with other SPE
save areas, such as used by KVM.

Acked-by: Kumar Gala 
Signed-off-by: Scott Wood 
Signed-off-by: Alexander Graf

powerpc: Add more Power7 specific definitions

2011-04-20T01:03:21+00:00

This adds more SPR definitions used on newer processors when running
in hypervisor mode. Along with some other P7 specific bits and pieces

Signed-off-by: Benjamin Herrenschmidt

powerpc: Account time using timebase rather than PURR

2010-09-02T04:07:31+00:00

Currently, when CONFIG_VIRT_CPU_ACCOUNTING is enabled, we use the
PURR register for measuring the user and system time used by
processes, as well as other related times such as hardirq and
softirq times.  This turns out to be quite confusing for users
because it means that a program will often be measured as taking
less time when run on a multi-threaded processor (SMT2 or SMT4 mode)
than it does when run on a single-threaded processor (ST mode), even
though the program takes longer to finish.  The discrepancy is
accounted for as stolen time, which is also confusing, particularly
when there are no other partitions running.

This changes the accounting to use the timebase instead, meaning that
the reported user and system times are the actual number of real-time
seconds that the program was executing on the processor thread,
regardless of which SMT mode the processor is in.  Thus a program will
generally show greater user and system times when run on a
multi-threaded processor than on a single-threaded processor.

On pSeries systems on POWER5 or later processors, we measure the
stolen time (time when this partition wasn't running) using the
hypervisor dispatch trace log.  We check for new entries in the
log on every entry from user mode and on every transition from
kernel process context to soft or hard IRQ context (i.e. when
account_system_vtime() gets called).  So that we can correctly
distinguish time stolen from user time and time stolen from system
time, without having to check the log on every exit to user mode,
we store separate timestamps for exit to user mode and entry from
user mode.

On systems that have a SPURR (POWER6 and POWER7), we read the SPURR
in account_system_vtime() (as before), and then apportion the SPURR
ticks since the last time we read it between scaled user time and
scaled system time according to the relative proportions of user
time and system time over the same interval.  This avoids having to
read the SPURR on every kernel entry and exit.  On systems that have
PURR but not SPURR (i.e., POWER5), we do the same using the PURR
rather than the SPURR.

This disables the DTL user interface in /sys/debug/kernel/powerpc/dtl
for now since it conflicts with the use of the dispatch trace log
by the time accounting code.

Signed-off-by: Paul Mackerras 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Adjust base and index registers in Altivec macros

2009-08-28T04:24:12+00:00

On POWER6 systems RA needs to be the base and RB the index.
If they are reversed you take a misdirect hit.

Signed-off-by: Mike Wolf 

----
Signed-off-by: Benjamin Herrenschmidt

powerpc: Modify some ppc_asm.h macros to accomodate 64-bits Book3E

2009-08-20T00:12:40+00:00

The way I intend to use tophys/tovirt on 64-bit BookE is different
from the "trick" that we currently play for 32-bit BookE so change
the condition of definition of these macros to make it so.

Also, make sure we only use rfid and mtmsrd instead of rfi and mtmsr
for 64-bit server processors, not all 64-bit processors.

Signed-off-by: Benjamin Herrenschmidt 
Acked-by: Kumar Gala

powerpc: Move VSX load/stores into ppc-opcode.h

2009-05-21T05:44:21+00:00

Cleans up the VSX load/store instructions by moving them into
ppc-opcode.h.

Signed-off-by: Michael Neuling 
Acked-by: Kumar Gala 
Signed-off-by: Benjamin Herrenschmidt

powerpc: Use __REF macro instead of old .text.init.refok.

2009-04-28T02:51:58+00:00

The section .text.init.refok is deprecated and __REF (.ref.text)
should be used in assembly files instead.  This patch cleans up a few
uses of .text.init.refok in the powerpc architecture.

Signed-off-by: Tim Abbott 
Cc: Benjamin Herrenschmidt 
Acked-by: Sam Ravnborg 
Signed-off-by: Linus Torvalds

powerpc: Unify opcode definitions and support

2009-02-22T23:48:56+00:00

Create a new header that becomes a single location for defining PowerPC
opcodes used by code that is either generationg instructions
at runtime (fixups, debug, etc.), emulating instructions, or just
compiling instructions old assemblers don't know about.

We currently don't handle the floating point emulation or alignment decode
as both are better handled by the specific decode support they already
have.

Added support for the new dcbzl, dcbal, msgsnd, tlbilx, & wait instructions
since older assemblers don't know about them.

Signed-off-by: Kumar Gala 
Signed-off-by: Benjamin Herrenschmidt

powerpc/32: Add the ability for a classic ppc kernel to be loaded at 32M

2008-12-23T04:13:29+00:00

Add the ability for a classic ppc kernel to be loaded at an address
of 32MB.  This done by fixing a few places that assume we are loaded
at address 0, and by changing several uses of KERNELBASE to use
PAGE_OFFSET, instead.

Signed-off-by: Dale Farnsworth 
Signed-off-by: Anton Vorontsov 
Signed-off-by: Paul Mackerras