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selftests/powerpc/dexcr: Add DEXCR status utility lsdexcr

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Add a utility 'lsdexcr' to print the current DEXCR status. Useful for
quickly checking the status such as when debugging test failures or
verifying the new default DEXCR does what you want (for userspace at
least). Example output:

    # ./lsdexcr
       uDEXCR: 04000000 (NPHIE)
       HDEXCR: 00000000
    Effective: 04000000 (NPHIE)

            SBHE   (0): clear  	(Speculative branch hint enable)
          IBRTPD   (3): clear  	(Indirect branch recurrent target ...)
           SRAPD   (4): clear  	(Subroutine return address ...)
           NPHIE * (5): set  	(Non-privileged hash instruction enable)
            PHIE   (6): clear  	(Privileged hash instruction enable)

    DEXCR[NPHIE] enabled: hashst/hashchk working

Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230616034846.311705-12-bgray@linux.ibm.com
This commit is contained in:
Benjamin Gray
2023-06-19 17:36:28 +10:00
committed by Michael Ellerman
parent bdb07f35a5
commit a16e472c35
3 changed files with 144 additions and 0 deletions
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1
tools/testing/selftests/powerpc/dexcr/.gitignore vendored
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@@ -1 +1,2 @@
hashchk_test
lsdexcr