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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 unavailableSYNOPSIS¶
int
arch_phys_wc_add(unsigned long base,
unsigned long size);
ARGUMENTS¶
basePhysical 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¶
January 2017 | Kernel Hackers Manual 4.8. |