1 /*
2  * Copyright (c) 2015 Intel corporation
3  *
4  * SPDX-License-Identifier: Apache-2.0
5  */
6 
7 /**
8  * @file Software interrupts utility code - ARM implementation
9  */
10 
11 #include <zephyr/kernel.h>
12 #include <zephyr/irq_offload.h>
13 
14 volatile irq_offload_routine_t offload_routine;
15 static const void *offload_param;
16 
17 /* Called by z_arm_svc */
z_irq_do_offload(void)18 void z_irq_do_offload(void)
19 {
20 	offload_routine(offload_param);
21 }
22 
arch_irq_offload(irq_offload_routine_t routine,const void * parameter)23 void arch_irq_offload(irq_offload_routine_t routine, const void *parameter)
24 {
25 #if defined(CONFIG_ARMV6_M_ARMV8_M_BASELINE) && defined(CONFIG_ASSERT)
26 	/* ARMv6-M/ARMv8-M Baseline HardFault if you make a SVC call with
27 	 * interrupts locked.
28 	 */
29 	unsigned int key;
30 
31 	__asm__ volatile("mrs %0, PRIMASK;" : "=r" (key) : : "memory");
32 	__ASSERT(key == 0U, "irq_offload called with interrupts locked\n");
33 #endif /* CONFIG_ARMV6_M_ARMV8_M_BASELINE && CONFIG_ASSERT */
34 
35 	k_sched_lock();
36 	offload_routine = routine;
37 	offload_param = parameter;
38 
39 	__asm__ volatile ("svc %[id]"
40 			  :
41 			  : [id] "i" (_SVC_CALL_IRQ_OFFLOAD)
42 			  : "memory");
43 
44 	offload_routine = NULL;
45 	k_sched_unlock();
46 }
47