linux.git/arch/sh/include/asm/processor_32.h, branch v2.6.33

sh: Minor optimisations to FPU handling

2009-11-24T08:45:38+00:00

A number of small optimisations to FPU handling, in particular:

 - move the task USEDFPU flag from the thread_info flags field (which
   is accessed asynchronously to the thread) to a new status field,
   which is only accessed by the thread itself. This allows locking to
   be removed in most cases, or can be reduced to a preempt_lock().
   This mimics the i386 behaviour.

 - move the modification of regs->sr and thread_info->status flags out
   of save_fpu() to __unlazy_fpu(). This gives the compiler a better
   chance to optimise things, as well as making save_fpu() symmetrical
   with restore_fpu() and init_fpu().

 - implement prepare_to_copy(), so that when creating a thread, we can
   unlazy the FPU prior to copying the thread data structures.

Also make sure that the FPU is disabled while in the kernel, in
particular while booting, and for newly created kernel threads,

In a very artificial benchmark, the execution time for 2500000
context switches was reduced from 50 to 45 seconds.

Signed-off-by: Stuart Menefy 
Signed-off-by: Paul Mundt

sh: Fix up DSP context save/restore.

2009-04-04T15:48:11+00:00

There were a number of issues with the DSP context save/restore code,
mostly left-over relics from when it was introduced on SH3-DSP with
little follow-up testing, resulting in things like task_pt_dspregs()
referencing incorrect state on the stack.

This follows the MIPS convention of tracking the DSP state in the
thread_struct and handling the state save/restore in switch_to() and
finish_arch_switch() respectively. The regset interface is also updated,
which allows us to finally be rid of task_pt_dspregs() and the special
cased task_pt_regs().

Signed-off-by: Michael Trimarchi 
Signed-off-by: Paul Mundt

sh: Disable unsupportable prefetching on SH-3.

2009-02-27T07:42:05+00:00

The SH-3 does not support 'pref'-based prefetching, only SH-2A and SH-4A
parts do. Remove SH-3 from the list.

Signed-off-by: Paul Mundt

SH: fix start_thread and user_stack_pointer macros

2009-01-29T06:41:15+00:00

Fix macros start_thread and user_stack_pointer.
When these macros aren't called with a variable named regs as second
argument, this will result in a build failure.

Signed-off-by: Roel Kluin 
Signed-off-by: Paul Mundt

sh: Conditionalize the code dumper on CONFIG_DUMP_CODE.

2008-12-22T09:44:47+00:00

We don't really want this enabled by default, but it is still quite
useful for debugging. So, make it conditional and leave it off by
default.

Signed-off-by: Paul Mundt

sh: Consolidate cpu_relax()/cpu_sleep() definitions across _32/_64.

2008-12-22T09:43:50+00:00

Signed-off-by: Paul Mundt

sh: Add a simple code dumper for SUPERH32 show_regs().

2008-12-22T09:43:49+00:00

This implements a simple show_code() that is in turn plugged in to
show_regs() to provide minimal code dumping at the end of the trace.

Built on top of a simple instruction disassembler derived from the
binutils opcode table.

Signed-off-by: Paul Mundt

sh: Consolidate struct sh_cpuinfo definitions across _32/_64 split.

2008-09-17T14:24:02+00:00

Signed-off-by: Paul Mundt

sh: provide user_stack_pointer(), needed for tracehook support.

2008-09-12T13:11:36+00:00

Signed-off-by: Paul Mundt

sh: fixup many sparse errors.

2008-09-08T01:35:04+00:00

Signed-off-by: Paul Mundt