ARCH_PHYS_WC_ADD(9)                    Hardware Interfaces                    ARCH_PHYS_WC_ADD(9)



NAME
       arch_phys_wc_add - add a WC MTRR and handle errors if PAT is unavailable

SYNOPSIS
       int arch_phys_wc_add(unsigned long base, unsigned long size);

ARGUMENTS
       base
           Physical base address

       size
           Size of region

DESCRIPTION
       If PAT is available, this does nothing. If PAT is unavailable, it attempts to add a WC
       MTRR covering size bytes starting at base and logs an error if this fails.

       The called should provide a power of two size on an equivalent power of two boundary.

       Drivers must store the return value to pass to mtrr_del_wc_if_needed, but drivers should
       not try to interpret that return value.

COPYRIGHT
Kernel Hackers Manual 4.8.                 January 2017                       ARCH_PHYS_WC_ADD(9)