[PATCH] Added Getentropy() support to beagle BSP

[Udit agarwal]

Thanks for pointing that out, I have rectified the indentation errors.

Here's the patch for atsam:
>From 8e5e17525a76e68bc4d869d0af9700aaa5628483 Mon Sep 17 00:00:00 2001
From: Udit agarwal <dev.madaari at gmail.com>
Date: Fri, 16 Mar 2018 14:54:53 +0530
Subject: [PATCH] arm/atsam: protect TRNG_GetRandData with mutex

---
 c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c
b/c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c
index 11e24dc..54a1cef 100644
--- a/c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c
+++ b/c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c
@@ -17,6 +17,9 @@
 #include <string.h>
 #include <rtems/sysinit.h>

+static rtems_mutex atsam_trng_mutex =
+    RTEMS_MUTEX_INITIALIZER("atsam_trng");
+
 static void atsam_trng_enable(void)
 {
  PMC_EnablePeripheral(ID_TRNG);
@@ -25,6 +28,8 @@ static void atsam_trng_enable(void)

 int getentropy(void *ptr, size_t n)
 {
+  rtems_mutex_lock(&atsam_trng_mutex);
+
  while (n > 0) {
    uint32_t random;
    size_t copy;
@@ -50,7 +55,7 @@ int getentropy(void *ptr, size_t n)
    n -= copy;
    ptr += copy;
  }
-
+  rtems_mutex_unlock(&atsam_trng_mutex);
  return 0;
 }

-- 
1.9.1

On Thu, Mar 15, 2018 at 7:52 PM, Gedare Bloom <gedare at rtems.org> wrote:

> On Thu, Mar 15, 2018 at 7:00 AM, Udit agarwal <dev.madaari at gmail.com>
> wrote:
> >
> >
> > On Thu, Mar 15, 2018 at 2:38 PM, Sebastian Huber
> > <sebastian.huber at embedded-brains.de> wrote:
> >>
> >> On 15/03/18 09:20, Udit agarwal wrote:
> >>>
> >>> Also, will it be ok to keep atsam_trng_mutex even after user has
> finished
> >>> using getentropy() i.e when we don't use destroy(&atsam_trng_mutex) at
> all?
> >>
> >>
> >> Why do you want to destroy the mutex?
> >
> > Just trying to reduce redundancy, but then i don't think that's a good
> idea.
> > BTW, here's atsam patch, please have a look:
> >
> > From 35313002ea19715c5914c5983a24471b0763aa68 Mon Sep 17 00:00:00 2001
> > From: Udit agarwal <dev.madaari at gmail.com>
> > Date: Thu, 15 Mar 2018 16:21:51 +0530
> > Subject: [PATCH] Added mutex across TRNG_GetRandData
>
> In the commit message, identify the rtems subsystem. I guess we don't
> have detailed advice on the wiki for this, but here I guess we usually
> would have something like "arm/atsam: protect TRNG_GetRandData with
> mutex"
>
> >
> > ---
> >  c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c
> > b/c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c
> > index 11e24dc..2789970 100644
> > --- a/c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c
> > +++ b/c/src/lib/libbsp/arm/atsam/startup/getentropy-trng.c
> > @@ -16,6 +16,9 @@
> >  #include <unistd.h>
> >  #include <string.h>
> >  #include <rtems/sysinit.h>
> > +#include <rtems/thread.h>
> > +
> > +static rtems_mutex atsam_trng_mutex =
> > RTEMS_MUTEX_INITIALIZER("atsam_trng");
> >
> The second line should be indented 2 more levels (4 spaces).
> https://devel.rtems.org/wiki/Developer/Coding/80_characters_per_line
>
> >  static void atsam_trng_enable(void)
> >  {
> > @@ -25,6 +28,9 @@ static void atsam_trng_enable(void)
> >
> >  int getentropy(void *ptr, size_t n)
> >  {
> > +
> > +    rtems_mutex_lock(&atsam_trng_mutex);
> The number of indent spaces here look wrong to me. It should be 2.
>
> > +
> >      while (n > 0) {
> >          uint32_t random;
> >          size_t copy;
> > @@ -51,6 +57,7 @@ int getentropy(void *ptr, size_t n)
> >          ptr += copy;
> >      }
> >
> > +    rtems_mutex_unlock(&atsam_trng_mutex);
> ditto.
>
> >      return 0;
> >  }
> >
> > --
> > 1.9.1
> >
> >
> >>
> >>
> >>
> >> --
> >> Sebastian Huber, embedded brains GmbH
> >>
> >> Address : Dornierstr. 4, D-82178 Puchheim, Germany
> >> Phone   : +49 89 189 47 41-16
> >> Fax     : +49 89 189 47 41-09
> >> E-Mail  : sebastian.huber at embedded-brains.de
> >> PGP     : Public key available on request.
> >>
> >> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
> >>
> >
> >
> > _______________________________________________
> > devel mailing list
> > devel at rtems.org
> > http://lists.rtems.org/mailman/listinfo/devel
>
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