Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1191464

Re: [PATCH V7 4/5] arm64: apei: implement arch_apei_get_mem_attributes()

Show all headers | View raw

On 07/22/2015 05:59 AM, Jonathan (Zhixiong) Zhang wrote:
> 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.

...

[...]
> +#ifdef	CONFIG_ACPI_APEI
> +/*
> + * According to "Table 8 Map: EFI memory types to AArch64 memory types"
> + * of UEFI 2.5 section 2.3.6.1, each EFI memory type is mapped to
> + * corresponding MAIR attribute encoding.
> + */
> +static inline pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr)
> +{
> +	pgprot_t prot;
> +
> +	prot = efi_mem_attributes(addr);
> +	if (prot & EFI_MEMORY_UC)
> +		return PROT_DEVICE_nGnRnE;
> +	if (prot & EFI_MEMORY_WC)
> +		return PROT_NORMAL_NC;
> +	if (prot & EFI_MEMORY_WT)
> +		return PROT_NORMAL_WT;
> +	return PAGE_KERNEL;
> +}

The change log is not matching the code here, and the PROT_DEVICE_nGnRE
in the change log is wrong, if you fix that,

Acked-by: Hanjun Guo <hanjun.guo@linaro.org>

Thanks
Hanjun

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next | Find similar | Unroll thread

Thread

Re: [PATCH V7 4/5] arm64: apei: implement arch_apei_get_mem_attributes() Hanjun Guo <hanjun.guo@linaro.org> - 2015-07-24 05:00 +0200

csiph-web