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Documentation/powerpc: Fix path to the powerpc directory
ppc -> powerpc
Signed-off-by: Thomas Waldecker <thomas.waldecker@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
authored by
Thomas Waldecker
and committed by
Benjamin Herrenschmidt
d69f1d7f
bf99de36
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Documentation/powerpc/cpu_features.txt
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Documentation/powerpc/cpu_features.txt
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sleep modes.
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Detection of the feature set is simple. A list of processors can be found in
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arch/ppc/kernel/cputable.c. The PVR register is masked and compared with each
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value in the list. If a match is found, the cpu_features of cur_cpu_spec is
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assigned to the feature bitmask for this processor and a __setup_cpu function
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is called.
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arch/powerpc/kernel/cputable.c. The PVR register is masked and compared with
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each value in the list. If a match is found, the cpu_features of cur_cpu_spec
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is assigned to the feature bitmask for this processor and a __setup_cpu
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function is called.
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C code may test 'cur_cpu_spec[smp_processor_id()]->cpu_features' for a
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particular feature bit. This is done in quite a few places, for example
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The END_FTR_SECTION macros are implemented by storing information about this
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code in the '__ftr_fixup' ELF section. When do_cpu_ftr_fixups
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(arch/ppc/kernel/misc.S) is invoked, it will iterate over the records in
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(arch/powerpc/kernel/misc.S) is invoked, it will iterate over the records in
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__ftr_fixup, and if the required feature is not present it will loop writing
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nop's from each BEGIN_FTR_SECTION to END_FTR_SECTION.