Remove Clock_driver_support_shutdown_hardware()

The aim of this clock driver hook was to stop clock tick interrupts at
some late point in the exit() procedure.

The use of atexit() pulls in malloc() which pulls in errno. It is
incompatible with the intention of the
CONFIGURE_DISABLE_NEWLIB_REENTRANCY configuration option.

The exit() function must be called from thread context, so accompanied
clock tick interrupts should cause no harm.  On the contrary, someone
may assume a normal operating system operation, e.g. working timeouts.

Remove the Clock_driver_support_shutdown_hardware() clock driver hook.

Close #3436.

1 files changed, 0 insertions, 17 deletions

diff --git a/bsps/or1k/generic_or1k/clock/clockdrv.c b/bsps/or1k/generic_or1k/clock/clockdrv.c
index 569421da6f..e2a8e4db17 100644
--- a/bsps/or1k/generic_or1k/clock/clockdrv.c
+++ b/bsps/or1k/generic_or1k/clock/clockdrv.c
@@ -112,21 +112,6 @@ static void generic_or1k_clock_initialize(void)
   rtems_timecounter_install(&or1ksim_tc);
 }
 
-static void generic_or1k_clock_cleanup(void)
-{
- uint32_t sr;
-
-  sr = _OR1K_mfspr(CPU_OR1K_SPR_SR);
-
-  /* Disable tick timer exceptions */
-  _OR1K_mtspr(CPU_OR1K_SPR_SR, (sr & ~CPU_OR1K_SPR_SR_IEE)
-  & ~CPU_OR1K_SPR_SR_TEE);
-
-  /* Invalidate tick timer config registers */
-  _OR1K_mtspr(CPU_OR1K_SPR_TTCR, 0);
-  _OR1K_mtspr(CPU_OR1K_SPR_TTMR, 0);
-}
-
 CPU_Counter_ticks _CPU_Counter_difference(
   CPU_Counter_ticks second,
   CPU_Counter_ticks first
@@ -142,6 +127,4 @@ CPU_Counter_ticks _CPU_Counter_difference(
 #define Clock_driver_support_install_isr(isr) \
   generic_or1k_clock_handler_install(isr)
 
-#define Clock_driver_support_shutdown_hardware() generic_or1k_clock_cleanup()
-
 #include "../../../shared/dev/clock/clockimpl.h"