en Copyright 2015 Java http://kernelsources.org:8080/source/history/freebsd/sys/dev/asmc/asmcmmio.h#a48b900300ebdbd5c47e664b4cc06e705da91bd8 asmc: add MMIO backend for T2 MacsT2 Macs (2018+) expose the SMC via memory-mapped registers instead ofI/O ports. Add asmcmmio.c/asmcmmio.h implementing the MMIO transport:key read/write, getinfo, getbyindex, and a poll-based wait withexponential backoff.The driver probes for MMIO at attach time by checking the LDKN firmwareversion key; if MMIO is available it is used, otherwise the standardI/O port backend is used.T2 fan speeds use IEEE 754 floats instead of fpe2 fixed-point.Per-fan manual mode uses F%dMd keys instead of the FS! bitmask.Battery charge limit is exposed via dev.asmc.N.battery_charge_limit.Tested on: MacBookPro16,2 (A2251, iBridge2,10) MacBookPro15,4 (A2159, iBridge2,8) MacBookAir8,2 (A1932, iBridge2,5) Mac mini 8,1 (A1993, iBridge2,7) iMac20,2 (A2115, iBridge2,16) iMacPro1,1 (A1862, iBridge1,1)MFC after: 2 weeksReviewed by: ngie, adrianDifferential Revision: https://reviews.freebsd.org/D57086 List of files: /freebsd/sys/dev/asmc/asmcmmio.h Wed, 03 Jun 2026 07:57:49 +0200 Abdelkader Boudih <freebsd@seuros.com>