Re: [Qemu-devel] [PATCH 4/4] hw/intc/arm_gic: Fix the NS view of C_BPR when C_CTRL.CBPR is 1

[Peter Maydell <peter.maydell@linaro.org>]

On 19 January 2018 at 14:57,  <luc.michel@greensocs.com> wrote:
> From: Luc MICHEL <luc.michel@git.antfield.fr>
>
> When C_CTRL.CBPR is 1, the Non-Secure view of C_BPR is altered:
>   - A Non-Secure read of C_BPR should return the BPR value plus 1,
>   saturated to 7,
>   - A Non-Secure write should be ignored.
>
> Signed-off-by: Luc MICHEL <luc.michel@git.antfield.fr>
> ---
>  hw/intc/arm_gic.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
>
> diff --git a/hw/intc/arm_gic.c b/hw/intc/arm_gic.c
> index d0a41a89ae..7418b7a082 100644
> --- a/hw/intc/arm_gic.c
> +++ b/hw/intc/arm_gic.c
> @@ -1211,8 +1211,13 @@ static MemTxResult gic_cpu_read(GICState *s, int cpu, int offset,
>          break;
>      case 0x08: /* Binary Point */
>          if (s->security_extn && !attrs.secure) {
> -            /* BPR is banked. Non-secure copy stored in ABPR. */
> -            *data = s->abpr[cpu];
> +            if (s->cpu_ctlr[cpu] & GICC_CTLR_CBPR) {
> +                /* NS view of BPR when CBPR is 1 */
> +                *data = MIN(s->bpr[cpu] + 1, 7);
> +            } else {
> +                /* BPR is banked. Non-secure copy stored in ABPR. */
> +                *data = s->abpr[cpu];
> +            }
>          } else {
>              *data = s->bpr[cpu];
>          }
> @@ -1285,7 +1290,12 @@ static MemTxResult gic_cpu_write(GICState *s, int cpu, int offset,
>          break;
>      case 0x08: /* Binary Point */
>          if (s->security_extn && !attrs.secure) {
> -            s->abpr[cpu] = MAX(value & 0x7, GIC_MIN_ABPR);
> +            if (s->cpu_ctlr[cpu] & GICC_CTLR_CBPR) {
> +                /* WI when CTLR is 1 */

should be "CBPR", yes?

> +                return MEMTX_OK;
> +            } else {
> +                s->abpr[cpu] = MAX(value & 0x7, GIC_MIN_ABPR);
> +            }
>          } else {
>              s->bpr[cpu] = MAX(value & 0x7, GIC_MIN_BPR);
>          }
> --

thanks
-- PMM