arch_phys_wc_add (9) - Linux Man Pages

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

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.

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