linux-toradex.git/arch/powerpc/kernel/misc.S, branch v3.4.73

powerpc: Remove legacy iSeries bits from assembly files

2012-03-08T23:54:59+00:00

This removes the various bits of assembly in the kernel entry,
exception handling and SLB management code that were specific
to running under the legacy iSeries hypervisor which is no
longer supported.

Signed-off-by: Benjamin Herrenschmidt

powerpc: Remove unneeded cpu_setup/restore from POWER7 cputable entry

2010-11-29T04:48:22+00:00

These are not needed so just remove them

Signed-off-by: Michael Neuling 
Signed-off-by: Benjamin Herrenschmidt

perf: Drop the skip argument from perf_arch_fetch_regs_caller

2010-06-08T21:31:27+00:00

Drop this argument now that we always want to rewind only to the
state of the first caller.
It means frame pointers are not necessary anymore to reliably get
the source of an event. But this also means we need this helper
to be a macro now, as an inline function is not an option since
we need to know when to provide a default implentation.

Signed-off-by: Frederic Weisbecker 
Signed-off-by: Paul Mackerras 
Cc: David Miller 
Cc: Ingo Molnar 
Cc: Peter Zijlstra 
Cc: Arnaldo Carvalho de Melo

perf: Always build the powerpc perf_arch_fetch_caller_regs version

2010-04-03T10:42:00+00:00

Now that software events use perf_arch_fetch_caller_regs() too, we
need the powerpc version to be always built.

Fixes the following build error:

	(.text+0x3210): undefined reference to `perf_arch_fetch_caller_regs'
	(.text+0x3324): undefined reference to `perf_arch_fetch_caller_regs'
	(.text+0x33bc): undefined reference to `perf_arch_fetch_caller_regs'
	(.text+0x33ec): undefined reference to `perf_arch_fetch_caller_regs'
	(.text+0xd4a0): undefined reference to `perf_arch_fetch_caller_regs'
	arch/powerpc/kernel/built-in.o:(.text+0xd528): more undefined references to `perf_arch_fetch_caller_regs' follow
	make[1]: *** [.tmp_vmlinux1] Error 1
	make: *** [sub-make] Error 2

Reported-by: Michael Ellerman 
Reported-by: Ingo Molnar 
Signed-off-by: Frederic Weisbecker 
Cc: Peter Zijlstra 
Cc: Arnaldo Carvalho de Melo 
Cc: Paul Mackerras

powerpc/perf_events: Fix call-graph recording, add perf_arch_fetch_caller_regs

2010-03-18T05:48:29+00:00

This implements a powerpc version of perf_arch_fetch_caller_regs
to get correct call-graphs.

It's implemented in assembly because that way we can be sure there isn't
a stack frame for perf_arch_fetch_caller_regs.  If it was in C, gcc might
or might not create a stack frame for it, which would affect the number
of levels we have to skip.

With this, we see results from perf record -e lock:lock_acquire like
this:

 # Samples: 24878
 #
 # Overhead         Command      Shared Object  Symbol
 # ........  ..............  .................  ......
 #
    14.99%            perf  [kernel.kallsyms]  [k] ._raw_spin_lock
                      |
                      --- ._raw_spin_lock
                         |
                         |--25.00%-- .alloc_fd
                         |          (nil)
                         |          |
                         |          |--50.00%-- .anon_inode_getfd
                         |          |          .sys_perf_event_open
                         |          |          syscall_exit
                         |          |          syscall
                         |          |          create_counter
                         |          |          __cmd_record
                         |          |          run_builtin
                         |          |          main
                         |          |          0xfd2e704
                         |          |          0xfd2e8c0
                         |          |          (nil)

... etc.

Signed-off-by: Paul Mackerras 
Acked-by: Benjamin Herrenschmidt 
Cc: anton@samba.org
Cc: linuxppc-dev@ozlabs.org
Cc: Peter Zijlstra 
Cc: Frederic Weisbecker 
LKML-Reference: <20100318050513.GA6575@drongo>
Signed-off-by: Ingo Molnar

powerpc: Use LOAD_REG_IMMEDIATE only for constants on 64-bit

2008-09-15T18:08:35+00:00

Using LOAD_REG_IMMEDIATE to get the address of kernel symbols
generates 5 instructions where LOAD_REG_ADDR can do it in one,
and will generate R_PPC64_ADDR16_* relocations in the output when
we get to making the kernel as a position-independent executable,
which we'd rather not have to handle.  This changes various bits
of assembly code to use LOAD_REG_ADDR when we need to get the
address of a symbol, or to use suitable position-independent code
for cases where we can't access the TOC for various reasons, or
if we're not running at the address we were linked at.

It also cleans up a few minor things; there's no reason to save and
restore SRR0/1 around RTAS calls, __mmu_off can get the return
address from LR more conveniently than the caller can supply it in
R4 (and we already assume elsewhere that EA == RA if the MMU is on
in early boot), and enable_64b_mode was using 5 instructions where
2 would do.

Signed-off-by: Paul Mackerras

powerpc: Add cputable entry for POWER7

2008-06-30T12:31:11+00:00

Add a cputable entry for the POWER7 processor.

Also tell firmware that we know about POWER7.

Signed-off-by: Michael Neuling 
Signed-off-by: Joel Schopp 
Signed-off-by: Paul Mackerras

[POWERPC] Make setjmp/longjmp code usable outside of xmon

2008-01-25T11:52:50+00:00

This makes the setjmp/longjmp code used by xmon, generically available
to other code.  It also removes the requirement for debugger hooks to
be only called on 0x300 (data storage) exception.

Signed-off-by: Michael Neuling 
Signed-off-by: Paul Mackerras

[POWERPC] kernel_execve is identical in 32 and 64 bit

2007-12-11T02:34:39+00:00

so consolidate it into misc.S.

Signed-off-by: Stephen Rothwell 
Signed-off-by: Paul Mackerras

[POWERPC] convert string i/o operations to C

2006-09-20T04:06:18+00:00

This produces essentially the same code and will make the iSeries i/o
consolidation easier.

The count parameter is changed to long since that will produce the same
(better) code on 32 and 64 bit builds.

Signed-off-by: Stephen Rothwell