CVS commit: src/sys/arch/x86

["Kamil Rytarowski" <kamil%netbsd.org@localhost>]

Module Name:    src
Committed By:   kamil
Date:           Fri Apr 14 04:43:47 UTC 2017

Modified Files:
        src/sys/arch/x86/include: cpu.h
        src/sys/arch/x86/x86: x86_machdep.c

Log Message:
x86: Export fpu_save, fpu_save_size, xsave_features to dedicated sysctl nodes

Add new defines:
 - CPU_FPU_SAVE (15)
   int: FPU Instructions layout
   * to use this, CPU_OSFXSR must be true
   * 0: FSAVE
   * 1: FXSAVE
   * 2: XSAVE
   * 3: XSAVEOPT
 - CPU_FPU_SAVE_SIZE (16)
   int: FPU Instruction layout size
 - CPU_XSAVE_FEATURES (17)
   quad: FPU XSAVE features

Bump CPU_MAXID from 15 to 18.

These values were prepared originally to be exported without ASCIIZ name to
be used as handler. These values are useful to get FPU accessors in a
debugger easier to implement on x86 (PT_SETFPREG, PT_GETFPREG).

This interface handles all supported x86 targets. In the older (i386) and
less featured CPUs check first osfxsr (OS uses FXSAVE/FXRSTOR).

According to sys/arch/x86/include/cpu.h r.1.65 this was prepared to be
exported beyond simple CTL_CREATE node.

Sponsored by <The NetBSD Foundation>


To generate a diff of this commit:
cvs rdiff -u -r1.68 -r1.69 src/sys/arch/x86/include/cpu.h
cvs rdiff -u -r1.90 -r1.91 src/sys/arch/x86/x86/x86_machdep.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.