Enable use of FIQs and IRQs as TSP interrupts
On a GICv2 system, interrupts that should be handled in the secure world are
typically signalled as FIQs. On a GICv3 system, these interrupts are signalled
as IRQs instead. The mechanism for handling both types of interrupts is the same
in both cases. This patch enables the TSP to run on a GICv3 system by:
1. adding support for handling IRQs in the exception handling code.
2. removing use of "fiq" in the names of data structures, macros and functions.
The build option TSPD_ROUTE_IRQ_TO_EL3 is deprecated and is replaced with a
new build flag TSP_NS_INTR_ASYNC_PREEMPT. For compatibility reasons, if the
former build flag is defined, it will be used to define the value for the
new build flag. The documentation is also updated accordingly.
Change-Id: I1807d371f41c3656322dd259340a57649833065e
diff --git a/bl32/tsp/aarch64/tsp_exceptions.S b/bl32/tsp/aarch64/tsp_exceptions.S
index 272d94b..d5e089f 100644
--- a/bl32/tsp/aarch64/tsp_exceptions.S
+++ b/bl32/tsp/aarch64/tsp_exceptions.S
@@ -70,6 +70,28 @@
add sp, sp, SCRATCH_REG_SIZE
.endm
+ /* ----------------------------------------------------
+ * Common TSP interrupt handling routine
+ * ----------------------------------------------------
+ */
+ .macro handle_tsp_interrupt label
+ /* Enable the SError interrupt */
+ msr daifclr, #DAIF_ABT_BIT
+
+ save_caller_regs_and_lr
+ bl tsp_common_int_handler
+ cbz x0, interrupt_exit_\label
+
+ /*
+ * This interrupt was not targetted to S-EL1 so send it to
+ * the monitor and wait for execution to resume.
+ */
+ smc #0
+interrupt_exit_\label:
+ restore_caller_regs_and_lr
+ eret
+ .endm
+
.globl tsp_exceptions
/* -----------------------------------------------------
@@ -120,36 +142,12 @@
.align 7
irq_sp_elx:
- /* Enable the SError interrupt */
- msr daifclr, #DAIF_ABT_BIT
-
- save_caller_regs_and_lr
- /* We just update some statistics in the handler */
- bl tsp_handle_preemption
- /* Hand over control to the normal world to handle the IRQ */
- smc #0
- /* The resume std smc starts from here */
- restore_caller_regs_and_lr
- eret
+ handle_tsp_interrupt irq_sp_elx
check_vector_size irq_sp_elx
.align 7
fiq_sp_elx:
- /* Enable the SError interrupt */
- msr daifclr, #DAIF_ABT_BIT
-
- save_caller_regs_and_lr
- bl tsp_fiq_handler
- cbz x0, fiq_sp_elx_done
-
- /*
- * This FIQ was not targetted to S-EL1 so send it to
- * the monitor and wait for execution to resume.
- */
- smc #0
-fiq_sp_elx_done:
- restore_caller_regs_and_lr
- eret
+ handle_tsp_interrupt fiq_sp_elx
check_vector_size fiq_sp_elx
.align 7