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Date: Tue, 21 Jul 2015 14:59:18 -0700 From: "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org> To: catalin.marinas@....com, will.deacon@....com, fu.wei@...aro.org, al.stone@...aro.org, "bp @ alien8 . de Matt Fleming" <matt.fleming@...el.com>, rjw@...ysocki.net Cc: "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org>, linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org Subject: [PATCH V7 3/5] arm64: mm: add PROT_DEVICE_nGnRnE and PROT_NORMAL_WT From: "Jonathan (Zhixiong) Zhang" <zjzhang@...eaurora.org> 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. MT_NORMAL_WT is defined, and its encoding is added to MAIR_EL1 when initializing cpu. Change-Id: I20ac71ddf74c17e41769ecbb5f8c60eeefbb398a Signed-off-by: Jonathan (Zhixiong) Zhang <zjzhang@...eaurora.org> --- arch/arm64/include/asm/memory.h | 1 + arch/arm64/include/asm/pgtable.h | 2 ++ arch/arm64/mm/proc.S | 6 ++++-- 3 files changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index f800d45ea226..4112b3d7468e 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -100,6 +100,7 @@ #define MT_DEVICE_GRE 2 #define MT_NORMAL_NC 3 #define MT_NORMAL 4 +#define MT_NORMAL_WT 5 /* * Memory types for Stage-2 translation diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 800ec0e87ed9..5c108ad13558 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -61,8 +61,10 @@ extern void __pgd_error(const char *file, int line, unsigned long val); #define PROT_SECT_DEFAULT (PMD_TYPE_SECT | PMD_SECT_AF) #endif +#define PROT_DEVICE_nGnRnE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_DEVICE_nGnRnE)) #define PROT_DEVICE_nGnRE (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_DEVICE_nGnRE)) #define PROT_NORMAL_NC (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_NORMAL_NC)) +#define PROT_NORMAL_WT (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_NORMAL_WT)) #define PROT_NORMAL (PROT_DEFAULT | PTE_PXN | PTE_UXN | PTE_ATTRINDX(MT_NORMAL)) #define PROT_SECT_DEVICE_nGnRE (PROT_SECT_DEFAULT | PMD_SECT_PXN | PMD_SECT_UXN | PMD_ATTRINDX(MT_DEVICE_nGnRE)) diff --git a/arch/arm64/mm/proc.S b/arch/arm64/mm/proc.S index 838266f5b056..23e265d732f8 100644 --- a/arch/arm64/mm/proc.S +++ b/arch/arm64/mm/proc.S @@ -294,7 +294,7 @@ ENTRY(__cpu_setup) msr cpacr_el1, x0 // Enable FP/ASIMD msr mdscr_el1, xzr // Reset mdscr_el1 /* - * Memory region attributes for LPAE: + * Memory region attributes for LPAE and EFI: * * n = AttrIndx[2:0] * n MAIR @@ -303,12 +303,14 @@ 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 -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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