From: "Jonathan (Zhixiong) Zhang" zjzhang@codeaurora.org
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 zjzhang@codeaurora.org --- arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/apei.c | 27 +++++++++++++++++++++++++++ 2 files changed, 28 insertions(+) create mode 100644 arch/arm64/kernel/apei.c
diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index 426d0763c81b..c135f1e4e3b8 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -36,6 +36,7 @@ arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o arm64-obj-$(CONFIG_PCI) += pci.o arm64-obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o arm64-obj-$(CONFIG_ACPI) += acpi.o +arm64-obj-$(CONFIG_ACPI_APEI) += apei.o
obj-y += $(arm64-obj-y) vdso/ obj-m += $(arm64-obj-m) diff --git a/arch/arm64/kernel/apei.c b/arch/arm64/kernel/apei.c new file mode 100644 index 000000000000..9c6b62f40ad7 --- /dev/null +++ b/arch/arm64/kernel/apei.c @@ -0,0 +1,27 @@ +/* + * Arch-specific APEI-related functions. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <acpi/apei.h> + +#include <linux/efi.h> + +#include <asm/pgtable.h> + +pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr) +{ + if (efi_mem_attributes(addr) & EFI_MEMORY_UC) + return PROT_DEVICE_nGnRE; + else + return PAGE_KERNEL; +}