refactor(gicv3): add helper function to get the limit of ESPI INTID
Add helper function gicv3_get_espi_limit() to get the value of
(maximum extended SPI INTID + 1), so that some duplicated code can be
removed later.
Signed-off-by: Heyi Guo <guoheyi@linux.alibaba.com>
Change-Id: I0355ca2647f872e8189add259f6c47d415494cce
diff --git a/drivers/arm/gic/v3/gicv3_helpers.c b/drivers/arm/gic/v3/gicv3_helpers.c
index 23a1dfa..ad7ff22 100644
--- a/drivers/arm/gic/v3/gicv3_helpers.c
+++ b/drivers/arm/gic/v3/gicv3_helpers.c
@@ -110,6 +110,28 @@
return spi_limit;
}
+#if GIC_EXT_INTID
+/*******************************************************************************
+ * Helper function to get the maximum ESPI INTID + 1.
+ ******************************************************************************/
+unsigned int gicv3_get_espi_limit(uintptr_t gicd_base)
+{
+ unsigned int typer_reg = gicd_read_typer(gicd_base);
+
+ /* Check if extended SPI range is implemented */
+ if ((typer_reg & TYPER_ESPI) != 0U) {
+ /*
+ * (maximum ESPI INTID + 1) is equal to
+ * 32 * (GICD_TYPER.ESPI_range + 1) + 4096
+ */
+ return ((((typer_reg >> TYPER_ESPI_RANGE_SHIFT) &
+ TYPER_ESPI_RANGE_MASK) + 1U) << 5) + MIN_ESPI_ID;
+ }
+
+ return 0U;
+}
+#endif /* GIC_EXT_INTID */
+
/*******************************************************************************
* Helper function to configure the default attributes of (E)SPIs.
******************************************************************************/