On Tue, Jul 21, 2015 at 10:59:18PM +0100, Jonathan (Zhixiong) Zhang wrote:
From: "Jonathan (Zhixiong) Zhang" zjzhang@codeaurora.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@codeaurora.org
I'll let the EFI guys to comment on whether these are needed, what for (we could probably live just fine only with Device nGnRE and Normal NC).
#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:
LPAE refers to the page table format, the comment probably inherited from arch/arm. EFI means a completely different thing, so please remove it.
* * 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
I don't think the write allocation hint makes much sense for WT memory (though it shouldn't cause issues either). Just use 10101010.