From 8d446c8647c9ab8fcb45a8fc7dbbafe1f83aa2f3 Mon Sep 17 00:00:00 2001 From: "Jonathan (Zhixiong) Zhang" Date: Fri, 7 Aug 2015 09:36:59 +0100 Subject: arm64/mm: Add PROT_DEVICE_nGnRnE and PROT_NORMAL_WT UEFI spec 2.5 section 2.3.6.1 defines that EFI_MEMORY_[UC|WC|WT|WB] are possible EFI memory types for AArch64. Each of those EFI memory types is mapped to a corresponding AArch64 memory type. So we need to define PROT_DEVICE_nGnRnE and PROT_NORMWL_WT additionaly. MT_NORMAL_WT is defined, and its encoding is added to MAIR_EL1 when initializing the CPU. Signed-off-by: Jonathan (Zhixiong) Zhang Signed-off-by: Matt Fleming Reviewed-by: Catalin Marinas Cc: H. Peter Anvin Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/1438936621-5215-6-git-send-email-matt@codeblueprint.co.uk Signed-off-by: Ingo Molnar --- arch/arm64/mm/proc.S | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'arch/arm64/mm') diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S index 39139a3aa16d..160a1b5ab9c6 100644 --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -167,12 +167,14 @@ ENTRY(__cpu_setup) * DEVICE_GRE 010 00001100 * NORMAL_NC 011 01000100 * NORMAL 100 11111111 + * NORMAL_WT 101 10111011 */ ldr x5, =MAIR(0x00, MT_DEVICE_nGnRnE) | \ MAIR(0x04, MT_DEVICE_nGnRE) | \ MAIR(0x0c, MT_DEVICE_GRE) | \ MAIR(0x44, MT_NORMAL_NC) | \ - MAIR(0xff, MT_NORMAL) + MAIR(0xff, MT_NORMAL) | \ + MAIR(0xbb, MT_NORMAL_WT) msr mair_el1, x5 /* * Prepare SCTLR -- cgit v1.2.3