hw/intc/arm_gicv3_its: Factor out "is intid a valid LPI ID?"

In process_mapti() we check interrupt IDs to see whether they are
in the valid LPI range. Factor this out into its own utility
function, as we're going to want it elsewhere too for GICv4.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20220408141550.1271295-7-peter.maydell@linaro.org

hw/intc/arm_gicv3_its.c

@@ -79,6 +79,12 @@ typedef enum ItsCmdResult {
     CMD_CONTINUE = 1,
 } ItsCmdResult;
 
+static inline bool intid_in_lpi_range(uint32_t id)
+{
+    return id >= GICV3_LPI_INTID_START &&
+        id < (1 << (GICD_TYPER_IDBITS + 1));
+}
+
 static uint64_t baser_base_addr(uint64_t value, uint32_t page_sz)
 {
     uint64_t result = 0;
@@ -410,7 +416,6 @@ static ItsCmdResult process_mapti(GICv3ITSState *s, const uint64_t *cmdpkt,
     uint32_t devid, eventid;
     uint32_t pIntid = 0;
     uint64_t num_eventids;
-    uint32_t num_intids;
     uint16_t icid = 0;
     DTEntry dte;
     ITEntry ite;
@@ -438,7 +443,6 @@ static ItsCmdResult process_mapti(GICv3ITSState *s, const uint64_t *cmdpkt,
         return CMD_STALL;
     }
     num_eventids = 1ULL << (dte.size + 1);
-    num_intids = 1ULL << (GICD_TYPER_IDBITS + 1);
 
     if (icid >= s->ct.num_entries) {
         qemu_log_mask(LOG_GUEST_ERROR,
@@ -460,7 +464,7 @@ static ItsCmdResult process_mapti(GICv3ITSState *s, const uint64_t *cmdpkt,
         return CMD_CONTINUE;
     }
 
-    if (pIntid < GICV3_LPI_INTID_START || pIntid >= num_intids) {
+    if (!intid_in_lpi_range(pIntid)) {
         qemu_log_mask(LOG_GUEST_ERROR,
                       "%s: invalid interrupt ID 0x%x\n", __func__, pIntid);
         return CMD_CONTINUE;