• Anshuman Khandual's avatar
    powerpc/perf: Add new BHRB related instructions for POWER8 · 95213959
    Anshuman Khandual authored
    This patch adds new POWER8 instruction encoding for reading
    and clearing Branch History Rolling Buffer entries. The new
    instruction 'mfbhrbe' (move from branch history rolling buffer
    entry) is used to read BHRB buffer entries and instruction
    'clrbhrb' (clear branch history rolling buffer) is used to
    clear the entire buffer. The instruction 'clrbhrb' has straight
    forward encoding. But the instruction encoding format for
    reading the BHRB entries is like 'mfbhrbe RT, BHRBE' where it
    takes two arguments, i.e the index for the BHRB buffer entry to
    read and a general purpose register to put the value which was
    read from the buffer entry.
    Signed-off-by: default avatarAnshuman Khandual <khandual@linux.vnet.ibm.com>
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    95213959
ppc-opcode.h 10.9 KB