On Tue, Jul 21, 2015 at 01:32:38AM +0100, Jonathan (Zhixiong) Zhang wrote: > From: "Jonathan (Zhixiong) Zhang" <[email protected]> > > If the physical address has memory attributes defined by EFI > memmap as EFI_MEMORY_UC, the page protection type is > PROT_DEVICE_nGnRE. Otherwise, the page protection type is > PAGE_KERNEL. > > Signed-off-by: Jonathan (Zhixiong) Zhang <[email protected]> > --- > This patch applies cleanly to efi-next-14364 of efi/next and > arm64-upstream-13521 of arm64/master, but needed slight change > to apply to next-20150720 of linux-next/master and > pm+acpi-4.2-rc3 of linux-pm/master. The later two branches > has newer arch/arm64/include/asm/acpi.h with following patch: > b6cfb277378e ACPI / ARM64: add BAD_MADT_GICC_ENTRY() macro > --- > arch/arm64/include/asm/acpi.h | 16 ++++++++++++++++ > 1 file changed, 16 insertions(+) > > diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h > index 39248d3adf5d..42e4fd8aaf34 100644 > --- a/arch/arm64/include/asm/acpi.h > +++ b/arch/arm64/include/asm/acpi.h > @@ -19,6 +19,11 @@ > #include <asm/psci.h> > #include <asm/smp_plat.h> > > +#ifdef CONFIG_ACPI_APEI > +#include <linux/efi.h> > +#include <asm/pgtable.h> > +#endif > + > /* Basic configuration for ACPI */ > #ifdef CONFIG_ACPI > /* ACPI table mapping after acpi_gbl_permanent_mmap is set */ > @@ -84,4 +89,15 @@ static inline const char *acpi_get_enable_method(int cpu) > { > return acpi_psci_present() ? "psci" : NULL; > } > + > +#ifdef CONFIG_ACPI_APEI > +static inline pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr) > +{ > + if (efi_mem_attributes(addr) & EFI_MEMORY_UC) > + return PROT_DEVICE_nGnRE;
The EFI spec says this should be nGnRnE afaict. > + > + return PAGE_KERNEL; About about about WC and WT? Will -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
