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From the Freescale PowerPC Architecture Primer: Alternate time base APU. This APU, implemented on the e500v2, defines a 64-bit time base counter that differs from the PowerPC defined time base in that it is not writable and counts at a different, and typically much higher, frequency. The alternate time base always counts up, wrapping when the 64-bit count overflows. This implementation of ATB uses the same frequency as the TB. The existing spr_read_atbu/l functions are unused without this patch to wire them into the SPR. RTEMS uses this SPR on the e6500, though this hasn't been tested. Message-ID: <20241219034035.1826173-6-npiggin@gmail.com> Signed-off-by: Nicholas Piggin <npiggin@gmail.com> |
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