[13/13] target-alpha: Implement RPCC.

A minimal implementation that more or less corresponds to the
user-level version used by target-i386.  More hoops will want
to be jumped through when alpha gets system-level emulation.

Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 qemu-timer.h             |   13 +++++++++++++
 target-alpha/cpu.h       |    1 -
 target-alpha/op_helper.c |    5 +++--
 3 files changed, 16 insertions(+), 3 deletions(-)

On Wed, Apr 07, 2010 at 03:42:54PM -0700, Richard Henderson wrote:
> A minimal implementation that more or less corresponds to the
> user-level version used by target-i386.  More hoops will want
> to be jumped through when alpha gets system-level emulation.

This patch looks ok, but it mixed host and target changes. Can you
please split it?

> Signed-off-by: Richard Henderson <rth@twiddle.net>
> ---
>  qemu-timer.h             |   13 +++++++++++++
>  target-alpha/cpu.h       |    1 -
>  target-alpha/op_helper.c |    5 +++--
>  3 files changed, 16 insertions(+), 3 deletions(-)
> 
> diff --git a/qemu-timer.h b/qemu-timer.h
> index d2e15f4..6e2d2e1 100644
> --- a/qemu-timer.h
> +++ b/qemu-timer.h
> @@ -209,6 +209,19 @@ static inline int64_t cpu_get_real_ticks(void)
>      return (int64_t)(count * cyc_per_count);
>  }
>  
> +#elif defined(__alpha__)
> +
> +static inline int64_t cpu_get_real_ticks(void)
> +{
> +    uint64_t cc;
> +    uint32_t cur, ofs;
> +
> +    asm volatile("rpcc %0" : "=r"(cc));
> +    cur = cc;
> +    ofs = cc >> 32;
> +    return cur - ofs;
> +}
> +
>  #else
>  /* The host CPU doesn't have an easily accessible cycle counter.
>     Just return a monotonically increasing value.  This will be
> diff --git a/target-alpha/cpu.h b/target-alpha/cpu.h
> index dae23e2..c2f6a50 100644
> --- a/target-alpha/cpu.h
> +++ b/target-alpha/cpu.h
> @@ -355,7 +355,6 @@ struct CPUAlphaState {
>      uint64_t ir[31];
>      float64 fir[31];
>      uint64_t pc;
> -    uint32_t pcc[2];
>      uint64_t ipr[IPR_LAST];
>      uint64_t ps;
>      uint64_t unique;
> diff --git a/target-alpha/op_helper.c b/target-alpha/op_helper.c
> index bfc095c..ff5ae26 100644
> --- a/target-alpha/op_helper.c
> +++ b/target-alpha/op_helper.c
> @@ -21,6 +21,7 @@
>  #include "host-utils.h"
>  #include "softfloat.h"
>  #include "helper.h"
> +#include "qemu-timer.h"
>  
>  /*****************************************************************************/
>  /* Exceptions processing helpers */
> @@ -33,8 +34,8 @@ void QEMU_NORETURN helper_excp (int excp, int error)
>  
>  uint64_t helper_load_pcc (void)
>  {
> -    /* XXX: TODO */
> -    return 0;
> +    /* ??? This isn't a timer for which we have any rate info.  */
> +    return (uint32_t)cpu_get_real_ticks();
>  }
>  
>  uint64_t helper_load_fpcr (void)
> -- 
> 1.6.6.1
> 
> 
> 
>