From: Marek Vasut <marex@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 1/2] ARM: add wfi assembly macro
Date: Mon, 3 Dec 2012 15:39:22 +0100 [thread overview]
Message-ID: <201212031539.22757.marex@denx.de> (raw)
In-Reply-To: <50BCA9E2.1000001@gmail.com>
Dear Rob Herring,
> On 12/02/2012 10:58 PM, Marek Vasut wrote:
> > Dear Rob Herring,
> >
> >> From: Rob Herring <rob.herring@calxeda.com>
> >>
> >> Since wfi instruction is only available on ARMv7, add a conditional
> >> macro for it.
> >>
> >> Signed-off-by: Rob Herring <rob.herring@calxeda.com>
> >> ---
> >>
> >> arch/arm/include/asm/system.h | 6 ++++++
> >> 1 file changed, 6 insertions(+)
> >>
> >> diff --git a/arch/arm/include/asm/system.h
> >> b/arch/arm/include/asm/system.h index 2b28a26..2f6aecd 100644
> >> --- a/arch/arm/include/asm/system.h
> >> +++ b/arch/arm/include/asm/system.h
> >> @@ -61,6 +61,12 @@
> >>
> >> #define nop() __asm__ __volatile__("mov\tr0,r0\t@ nop\n\t");
> >>
> >> +#ifdef __ARM_ARCH_7A__
> >> +#define wfi() __asm__ __volatile__ ("wfi" : : : "memory")
> >> +#else
> >> +#define wfi()
> >> +#endif
> >
> > Won't this break other (non-arm) systems? Moreover, maybe you can make
> > this an (inline) function instead?
>
> How? It is in an ARM specific header and empty on anything but ARMv7
> enabled compiler. This follows the kernel implementation and the nop above.
Ok, I missed the arch/arm. It's ok then, sorry for the noise.
[...]
Best regards,
Marek Vasut
next prev parent reply other threads:[~2012-12-03 14:39 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-03 3:06 [U-Boot] [PATCH 1/2] ARM: add wfi assembly macro Rob Herring
2012-12-03 3:06 ` [U-Boot] [PATCH 2/2] ARM: highbank: use wfi macro instead of inline asm Rob Herring
2013-02-03 14:29 ` Albert ARIBAUD
2012-12-03 4:58 ` [U-Boot] [PATCH 1/2] ARM: add wfi assembly macro Marek Vasut
2012-12-03 13:32 ` Rob Herring
2012-12-03 14:39 ` Marek Vasut [this message]
2013-02-03 14:29 ` Albert ARIBAUD
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=201212031539.22757.marex@denx.de \
--to=marex@denx.de \
--cc=u-boot@lists.denx.de \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox