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4 This document describes the system (including self-modifying code) used in the
8 Early in the boot process the ppc32 kernel detects the current CPU type and
13 Detection of the feature set is simple. A list of processors can be found in
15 each value in the list. If a match is found, the cpu_features of cur_cpu_spec
20 particular feature bit. This is done in quite a few places, for example
21 in ppc_setup_l2cr().
23 Implementing cpufeatures in assembly is a little more involved. There are
34 just 2 macros (found in arch/powerpc/include/asm/cputable.h), as seen in head.S
48 and END_FTR_SECTION_IFCLR. These simply test if a flag is set (in
50 should be used in the majority of cases.
53 code in the '__ftr_fixup' ELF section. When do_cpu_ftr_fixups
54 (arch/powerpc/kernel/misc.S) is invoked, it will iterate over the records in