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hw/arm/armv7m_nvic: Check subpriority in nvic_recompute_state_secure()

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Rule R_CQRV says that if two pending interrupts have the same
group priority then ties are broken by looking at the subpriority.
We had a comment describing this but had forgotten to actually
implement the subpriority comparison. Correct the omission.

(The further tie break rules of "lowest exception number" and
"secure before non-secure" are handled implicitly by the order
in which we iterate through the exceptions in the loops.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20190430131439.25251-2-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2019-05-07 12:55:03 +01:00
parent 946376c21b
commit b01e2f0284
1 changed files with 7 additions and 2 deletions
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9
hw/intc/armv7m_nvic.c
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@ -213,6 +213,7 @@ static void nvic_recompute_state_secure(NVICState *s)
int active_prio = NVIC_NOEXC_PRIO;
int pend_irq = 0;
bool pending_is_s_banked = false;
int pend_subprio = 0;
/* R_CQRV: precedence is by:
* - lowest group priority; if both the same then
@ -226,7 +227,7 @@ static void nvic_recompute_state_secure(NVICState *s)
for (i = 1; i < s->num_irq; i++) {
for (bank = M_REG_S; bank >= M_REG_NS; bank--) {
VecInfo *vec;
int prio;
int prio, subprio;
bool targets_secure;
if (bank == M_REG_S) {
@ -241,8 +242,12 @@ static void nvic_recompute_state_secure(NVICState *s)
}
prio = exc_group_prio(s, vec->prio, targets_secure);
if (vec->enabled && vec->pending && prio < pend_prio) {
subprio = vec->prio & ~nvic_gprio_mask(s, targets_secure);
if (vec->enabled && vec->pending &&
((prio < pend_prio) ||
(prio == pend_prio && prio >= 0 && subprio < pend_subprio))) {
pend_prio = prio;
pend_subprio = subprio;
pend_irq = i;
pending_is_s_banked = (bank == M_REG_S);
}