refactor(gicv3): add helper function to get the limit of SPI INTID
Add helper function gicv3_get_spi_limit() to get the value of (maximum
SPI INTID + 1), so that some duplicated code can be removed later.
Signed-off-by: Heyi Guo <guoheyi@linux.alibaba.com>
Change-Id: I160c8a88fbb71d22790b8999a84afbfba766f5e7
diff --git a/drivers/arm/gic/v3/gicv3_helpers.c b/drivers/arm/gic/v3/gicv3_helpers.c
index 6bb66a0..23a1dfa 100644
--- a/drivers/arm/gic/v3/gicv3_helpers.c
+++ b/drivers/arm/gic/v3/gicv3_helpers.c
@@ -92,6 +92,25 @@
}
/*******************************************************************************
+ * Helper function to get the maximum SPI INTID + 1.
+ ******************************************************************************/
+unsigned int gicv3_get_spi_limit(uintptr_t gicd_base)
+{
+ unsigned int spi_limit;
+ unsigned int typer_reg = gicd_read_typer(gicd_base);
+
+ /* (maximum SPI INTID + 1) is equal to 32 * (GICD_TYPER.ITLinesNumber+1) */
+ spi_limit = ((typer_reg & TYPER_IT_LINES_NO_MASK) + 1U) << 5;
+
+ /* Filter out special INTIDs 1020-1023 */
+ if (spi_limit > (MAX_SPI_ID + 1U)) {
+ return MAX_SPI_ID + 1U;
+ }
+
+ return spi_limit;
+}
+
+/*******************************************************************************
* Helper function to configure the default attributes of (E)SPIs.
******************************************************************************/
void gicv3_spis_config_defaults(uintptr_t gicd_base)