From: "Jonathan (Zhixiong) Zhang" <zjzh...@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 <zjzh...@codeaurora.org>
---
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;
+
+ return PAGE_KERNEL;
+}
+#endif
+
#endif /*_ASM_ACPI_H*/
--
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a Linux Foundation Collaborative Project
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