Tegra: implement FIQ interrupt handler
This patch adds a handler for FIQ interrupts triggered when
the CPU is in the NS world. The handler stores the NS world's
context along with ELR_EL3/SPSR_EL3.
The NS world driver issues an SMC initially to register it's
handler. The monitor firmware stores this handler address and
jumps to it when the FIQ interrupt fires. Upon entry into the
NS world the driver then issues another SMC to get the CPU
context when the FIQ fired. This allows the NS world driver to
determine the CPU state and call stack when the interrupt
fired. Generally, systems register watchdog interrupts as FIQs
which are then used to get the CPU state during hangs/crashes.
Change-Id: I733af61a08d1318c75acedbe9569a758744edd0c
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/plat/nvidia/tegra/include/tegra_private.h b/plat/nvidia/tegra/include/tegra_private.h
index f5ffa9e..c65baca 100644
--- a/plat/nvidia/tegra/include/tegra_private.h
+++ b/plat/nvidia/tegra/include/tegra_private.h
@@ -54,6 +54,14 @@
int uart_id;
} plat_params_from_bl2_t;
+/*******************************************************************************
+ * Per-CPU struct describing FIQ state to be stored
+ ******************************************************************************/
+typedef struct pcpu_fiq_state {
+ uint64_t elr_el3;
+ uint64_t spsr_el3;
+} pcpu_fiq_state_t;
+
/* Declarations for plat_psci_handlers.c */
int32_t tegra_soc_validate_power_state(unsigned int power_state,
psci_power_state_t *req_state);
@@ -67,6 +75,11 @@
void plat_secondary_setup(void);
int plat_lock_cpu_vectors(void);
+/* Declarations for tegra_fiq_glue.c */
+void tegra_fiq_handler_setup(void);
+int tegra_fiq_get_intr_context(void);
+void tegra_fiq_set_ns_entrypoint(uint64_t entrypoint);
+
/* Declarations for tegra_gic.c */
void tegra_gic_setup(const unsigned int *irq_sec_ptr, unsigned int num_irqs);
void tegra_gic_cpuif_deactivate(void);