Re: [PATCH] sh: add kexec jump support V2

[Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>]

Hi,all.

I'm sorry that I could not check this patch.

This patch became compilation error in SH2/SH2A, because there are
not a spc register and a ssr register in SH2.[0]
I don't have environment of SH2 and I don't know whether I work
by these measures.
Do you have somebody, environment?

[0]: http://kisskb.ellerman.id.au/kisskb/buildresult/271654/

Best regards,
 Nobuhiro

Magnus Damm wrote:
> From: Magnus Damm <damm@igel.co.jp>
> 
> Add kexec jump support to the SuperH architecture V2.
> 
> Similar to the x86 implementation, with the following
> exceptions:
> 
> - Instead of separating the assembly code flow into
> two parts for regular kexec and kexec jump we use a
> single code path. In the assembly snippet regular
> kexec is just kexec jump that never comes back.
> 
> - Instead of using a swap page when moving data between
> pages the page copy assembly routine has been modified
> to exchange the data between the pages using registers.
> 
> - We walk the page list twice in machine_kexec() to
> do and undo physical to virtual address conversion.
> 
> Signed-off-by: Magnus Damm <damm@igel.co.jp>