@@ -349,15 +349,40 @@ int armv7m_nvic_raw_execution_priority(void *opaque)
return s->exception_prio;
}
-/* caller must call nvic_irq_update() after this */
-static void set_prio(NVICState *s, unsigned irq, uint8_t prio)
+/* caller must call nvic_irq_update() after this.
+ * secure indicates the bank to use for banked exceptions (we assert if
+ * we are passed secure=true for a non-banked exception).
+ */
+static void set_prio(NVICState *s, unsigned irq, bool secure, uint8_t prio)
{
assert(irq > ARMV7M_EXCP_NMI); /* only use for configurable prios */
assert(irq < s->num_irq);
- s->vectors[irq].prio = prio;
+ if (secure) {
+ assert(exc_is_banked(irq));
+ s->sec_vectors[irq].prio = prio;
+ } else {
+ s->vectors[irq].prio = prio;
+ }
+
+ trace_nvic_set_prio(irq, secure, prio);
+}
+
+/* Return the current raw priority register value.
+ * secure indicates the bank to use for banked exceptions (we assert if
+ * we are passed secure=true for a non-banked exception).
+ */
+static int get_prio(NVICState *s, unsigned irq, bool secure)
+{
+ assert(irq > ARMV7M_EXCP_NMI); /* only use for configurable prios */
+ assert(irq < s->num_irq);
- trace_nvic_set_prio(irq, prio);
+ if (secure) {
+ assert(exc_is_banked(irq));
+ return s->sec_vectors[irq].prio;
+ } else {
+ return s->vectors[irq].prio;
+ }
}
/* Recompute state and assert irq line accordingly.
@@ -1149,6 +1174,47 @@ static bool nvic_user_access_ok(NVICState *s, hwaddr offset, MemTxAttrs attrs)
}
}
+static int shpr_bank(NVICState *s, int exc, MemTxAttrs attrs)
+{
+ /* Behaviour for the SHPR register field for this exception:
+ * return M_REG_NS to use the nonsecure vector (including for
+ * non-banked exceptions), M_REG_S for the secure version of
+ * a banked exception, and -1 if this field should RAZ/WI.
+ */
+ switch (exc) {
+ case ARMV7M_EXCP_MEM:
+ case ARMV7M_EXCP_USAGE:
+ case ARMV7M_EXCP_SVC:
+ case ARMV7M_EXCP_PENDSV:
+ case ARMV7M_EXCP_SYSTICK:
+ /* Banked exceptions */
+ return attrs.secure;
+ case ARMV7M_EXCP_BUS:
+ /* Not banked, RAZ/WI from nonsecure if BFHFNMINS is zero */
+ if (!attrs.secure &&
+ !(s->cpu->env.v7m.aircr & R_V7M_AIRCR_BFHFNMINS_MASK)) {
+ return -1;
+ }
+ return M_REG_NS;
+ case ARMV7M_EXCP_SECURE:
+ /* Not banked, RAZ/WI from nonsecure */
+ if (!attrs.secure) {
+ return -1;
+ }
+ return M_REG_NS;
+ case ARMV7M_EXCP_DEBUG:
+ /* Not banked. TODO should RAZ/WI if DEMCR.SDME is set */
+ return M_REG_NS;
+ case 8 ... 10:
+ case 13:
+ /* RES0 */
+ return -1;
+ default:
+ /* Not reachable due to decode of SHPR register addresses */
+ g_assert_not_reached();
+ }
+}
+
static MemTxResult nvic_sysreg_read(void *opaque, hwaddr addr,
uint64_t *data, unsigned size,
MemTxAttrs attrs)
@@ -1213,10 +1279,16 @@ static MemTxResult nvic_sysreg_read(void *opaque, hwaddr addr,
}
}
break;
- case 0xd18 ... 0xd23: /* System Handler Priority. */
+ case 0xd18 ... 0xd23: /* System Handler Priority (SHPR1, SHPR2, SHPR3) */
val = 0;
for (i = 0; i < size; i++) {
- val |= s->vectors[(offset - 0xd14) + i].prio << (i * 8);
+ unsigned hdlidx = (offset - 0xd14) + i;
+ int sbank = shpr_bank(s, hdlidx, attrs);
+
+ if (sbank < 0) {
+ continue;
+ }
+ val = deposit32(val, i * 8, 8, get_prio(s, hdlidx, sbank));
}
break;
case 0xfe0 ... 0xfff: /* ID. */
@@ -1299,15 +1371,21 @@ static MemTxResult nvic_sysreg_write(void *opaque, hwaddr addr,
for (i = 0; i < size && startvec + i < s->num_irq; i++) {
if (attrs.secure || s->itns[startvec + i]) {
- set_prio(s, startvec + i, (value >> (i * 8)) & 0xff);
+ set_prio(s, startvec + i, false, (value >> (i * 8)) & 0xff);
}
}
nvic_irq_update(s);
return MEMTX_OK;
- case 0xd18 ... 0xd23: /* System Handler Priority. */
+ case 0xd18 ... 0xd23: /* System Handler Priority (SHPR1, SHPR2, SHPR3) */
for (i = 0; i < size; i++) {
unsigned hdlidx = (offset - 0xd14) + i;
- set_prio(s, hdlidx, (value >> (i * 8)) & 0xff);
+ int newprio = extract32(value, i * 8, 8);
+ int sbank = shpr_bank(s, hdlidx, attrs);
+
+ if (sbank < 0) {
+ continue;
+ }
+ set_prio(s, hdlidx, sbank, newprio);
}
nvic_irq_update(s);
return MEMTX_OK;
@@ -169,7 +169,7 @@ gicv3_redist_send_sgi(uint32_t cpu, int irq) "GICv3 redistributor 0x%x pending S
# hw/intc/armv7m_nvic.c
nvic_recompute_state(int vectpending, int vectpending_prio, int exception_prio) "NVIC state recomputed: vectpending %d vectpending_prio %d exception_prio %d"
nvic_recompute_state_secure(int vectpending, bool vectpending_is_s_banked, int vectpending_prio, int exception_prio) "NVIC state recomputed: vectpending %d is_s_banked %d vectpending_prio %d exception_prio %d"
-nvic_set_prio(int irq, uint8_t prio) "NVIC set irq %d priority %d"
+nvic_set_prio(int irq, bool secure, uint8_t prio) "NVIC set irq %d secure-bank %d priority %d"
nvic_irq_update(int vectpending, int pendprio, int exception_prio, int level) "NVIC vectpending %d pending prio %d exception_prio %d: setting irq line to %d"
nvic_escalate_prio(int irq, int irqprio, int runprio) "NVIC escalating irq %d to HardFault: insufficient priority %d >= %d"
nvic_escalate_disabled(int irq) "NVIC escalating irq %d to HardFault: disabled"
Make the set_prio() function take a bool indicating whether to pend the secure or non-secure version of a banked interrupt, and use this to implement the correct banking semantics for the SHPR registers. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> --- hw/intc/armv7m_nvic.c | 96 ++++++++++++++++++++++++++++++++++++++++++++++----- hw/intc/trace-events | 2 +- 2 files changed, 88 insertions(+), 10 deletions(-) -- 2.7.4