On 22 August 2014 05:29, Fabian Aggeler <[email protected]> wrote:
> For GICs with Security Extensions Non-secure reads have a restricted
> view on the current running priority.
>
> Signed-off-by: Fabian Aggeler <[email protected]>
> ---
> hw/intc/arm_gic.c | 17 ++++++++++++++++-
> hw/intc/gic_internal.h | 1 +
> 2 files changed, 17 insertions(+), 1 deletion(-)
>
> diff --git a/hw/intc/arm_gic.c b/hw/intc/arm_gic.c
> index 57021fd..473b8f4 100644
> --- a/hw/intc/arm_gic.c
> +++ b/hw/intc/arm_gic.c
> @@ -285,6 +285,21 @@ void gic_set_cpu_control(GICState *s, int cpu,
> uint32_t value)
> }
> }
>
> +uint8_t gic_get_running_priority(GICState *s, int cpu)
> +{
> + if (s->security_extn && ns_access()) {
> + if (s->running_priority[cpu] & 0x80) {
+ /* Running priority in upper half, return Non-secure view */
> + return s->running_priority[cpu] << 1;
>
This needs to be masked otherwise it could return a value with rsvd bits
set.
> + } else {
> + /* Running priority in lower half, RAZ */
> + return 0;
> + }
> + } else {
> + return s->running_priority[cpu];
> + }
> +}
> +
> void gic_complete_irq(GICState *s, int cpu, int irq)
> {
> int update = 0;
> @@ -801,7 +816,7 @@ static uint32_t gic_cpu_read(GICState *s, int cpu, int
> offset)
> case 0x0c: /* Acknowledge */
> return gic_acknowledge_irq(s, cpu);
> case 0x14: /* Running Priority */
> - return s->running_priority[cpu];
> + return gic_get_running_priority(s, cpu);
> case 0x18: /* Highest Pending Interrupt */
> return s->current_pending[cpu];
> case 0x1c: /* Aliased Binary Point */
> diff --git a/hw/intc/gic_internal.h b/hw/intc/gic_internal.h
> index e9814f4..433d75e 100644
> --- a/hw/intc/gic_internal.h
> +++ b/hw/intc/gic_internal.h
> @@ -78,6 +78,7 @@ void gic_init_irqs_and_distributor(GICState *s, int
> num_irq);
> void gic_set_priority(GICState *s, int cpu, int irq, uint8_t val);
> uint32_t gic_get_cpu_control(GICState *s, int cpu);
> void gic_set_cpu_control(GICState *s, int cpu, uint32_t value);
> +uint8_t gic_get_running_priority(GICState *s, int cpu);
>
>
> static inline bool gic_test_pending(GICState *s, int irq, int cm)
> --
> 1.8.3.2
>
>
