Re: [Qemu-devel] [RFC 1/2] ARM: cpu: add "hivecs" property (high vectors on reset)

[Antony Pavlov <antonynpavlov@gmail.com>]

On Sat, 7 Dec 2013 11:00:05 +1000
Peter Crosthwaite <peter.crosthwaite@xilinx.com> wrote:

> On Sat, Dec 7, 2013 at 10:55 AM, Antony Pavlov <antonynpavlov@gmail.com> wrote:
> > Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
> > ---
> >  target-arm/cpu-qom.h |  1 +
> >  target-arm/cpu.c     | 13 +++++++++++++
> >  2 files changed, 14 insertions(+)
> >
> > diff --git a/target-arm/cpu-qom.h b/target-arm/cpu-qom.h
> > index b55306a..116320c 100644
> > --- a/target-arm/cpu-qom.h
> > +++ b/target-arm/cpu-qom.h
> > @@ -128,6 +128,7 @@ typedef struct ARMCPU {
> >      uint32_t ccsidr[16];
> >      uint32_t reset_cbar;
> >      uint32_t reset_auxcr;
> > +    bool reset_hivecs;
> >  } ARMCPU;
> >
> >  #define TYPE_AARCH64_CPU "aarch64-cpu"
> > diff --git a/target-arm/cpu.c b/target-arm/cpu.c
> > index d40f2a7..f838499 100644
> > --- a/target-arm/cpu.c
> > +++ b/target-arm/cpu.c
> > @@ -20,6 +20,7 @@
> >
> >  #include "cpu.h"
> >  #include "qemu-common.h"
> > +#include "hw/qdev-properties.h"
> >  #if !defined(CONFIG_USER_ONLY)
> >  #include "hw/loader.h"
> >  #endif
> > @@ -119,6 +120,12 @@ static void arm_cpu_reset(CPUState *s)
> >              env->regs[15] = pc & ~1;
> >          }
> >      }
> > +
> > +    if (cpu->reset_hivecs) {
> > +            uint32_t c1_sys = env->cp15.c1_sys;
> > +            env->cp15.c1_sys = c1_sys | (1 << 13);
> 
> Why the read modify write? Cant you do it as a one-liner |= ?
> 
> env->cp15.c1_sys |= (1 << 13);
> 
> > +    }
> > +
> >      env->vfp.xregs[ARM_VFP_FPEXC] = 0;
> >  #endif
> >      set_flush_to_zero(1, &env->vfp.standard_fp_status);
> > @@ -854,6 +861,11 @@ typedef struct ARMCPUInfo {
> >      void (*class_init)(ObjectClass *oc, void *data);
> >  } ARMCPUInfo;
> >
> > +static Property arm_cpu_properties[] = {
> > +    DEFINE_PROP_BOOL("hivecs", ARMCPU, reset_hivecs, false),
> 
> As this is indicating a reset value, "reset" should feature in the
> property name.
> 
> > +    DEFINE_PROP_END_OF_LIST(),
> > +};
> > +
> >  static const ARMCPUInfo arm_cpus[] = {
> >  #if !defined(CONFIG_USER_ONLY) || !defined(TARGET_AARCH64)
> >      { .name = "arm926",      .initfn = arm926_initfn },
> > @@ -902,6 +914,7 @@ static void arm_cpu_class_init(ObjectClass *oc, void *data)
> >
> >      acc->parent_realize = dc->realize;
> >      dc->realize = arm_cpu_realizefn;
> > +    dc->props = arm_cpu_properties;
> 
> This unconditionally adds the property to all ARM CPUs, wheras its
> only valid for a subset of ARM CPUs (!M). Check the earlier patches in
> the CBAR/highbank/zynq series on list for the change pattern for
> adding it as a conditional dynamic property instead. I'll take it into

Is there any public repo with this changes?

> that series if you want to rebase onto my patch set (will save you
> having to conflict by adding post-init fn which is still absent from
> mainline).
> 
> Regards,
> Peter
> 
> >
> >      acc->parent_reset = cc->reset;
> >      cc->reset = arm_cpu_reset;
> > --
> > 1.8.5
> >
> >


-- 
-- 
Best regards,
  Antony Pavlov