Re: [PATCH] Add MIPS64R2 core support.

[Sergei Shtylyov <sshtylyov@mvista.com>]

Hello.

On 09-04-2012 20:04, Steven J. Hill wrote:

> From: "Steven J. Hill"<sjhill@mips.com>

> Signed-off-by: Leonid Yegoshin<yegoshin@mips.com>
> Signed-off-by: Steven J. Hill<sjhill@mips.com>
> ---
>   arch/mips/Kconfig            |   29 +++++++++++++++++++++++------
>   arch/mips/include/asm/cpu.h  |    2 +-
>   arch/mips/kernel/cpu-probe.c |    4 ++++
>   arch/mips/kernel/traps.c     |    1 +
>   4 files changed, 29 insertions(+), 7 deletions(-)

> diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
> index 991de91..fae33f3 100644
> --- a/arch/mips/Kconfig
> +++ b/arch/mips/Kconfig
> @@ -282,6 +282,7 @@ config MIPS_MALTA
>   	select SYS_HAS_CPU_MIPS32_R1
>   	select SYS_HAS_CPU_MIPS32_R2
>   	select SYS_HAS_CPU_MIPS64_R1
> +	select SYS_HAS_CPU_MIPS64_R2
>   	select SYS_HAS_CPU_NEVADA
>   	select SYS_HAS_CPU_RM7000
>   	select SYS_HAS_EARLY_PRINTK
> @@ -1761,6 +1762,22 @@ config 64BIT
>
>   endchoice
>
> +config 64BIT_PHYS_ADDR
> +	bool "Kernel supports 64 bit physical addresses" if EXPERIMENTAL
> +	depends on 64BIT

    This option is selected on 32-bit CPUs like Alchemy, which has 36-bit 
physical address. It will cause a warning about unmet direct dependencies then.

> +	help
> +	  Defines 64 bit physical addresses in kernel.
> +	  Increases page table sizes.
> +
> +	  It is an alternative for HIGHMEM usage of huge physical memory.
> +	  Requires 64bit capable CPU  and 64 bit kernel code model.

    No, it really doesn't.

> +	  Note: without this option kernel can support up to 4GB physical
> +	  memory for 4KB pages and up to 64GB for 64KB pages.
> +
> +config ARCH_PHYS_ADDR_T_64BIT
> +       def_bool 64BIT_PHYS_ADDR
> +
>   choice
>   	prompt "Kernel page size"
>   	default PAGE_SIZE_4KB

WBR, Sergei