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/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
/* Helper to declare IRQ handling routines */
#ifndef __IRQ_HANDLER_H
#define __IRQ_HANDLER_H
#ifdef CONFIG_TASK_PROFILING
#define bl_task_start_irq_handler "bl task_start_irq_handler\n"
#else
#define bl_task_start_irq_handler ""
#endif
/* Helper macros to build the IRQ handler and priority struct names */
#define IRQ_HANDLER(irqname) CONCAT3(irq_, irqname, _handler)
#define IRQ_PRIORITY(irqname) CONCAT2(prio_, irqname)
/* re-scheduling flag */
extern int need_resched_or_profiling;
/*
* Macro to connect the interrupt handler "routine" to the irq number "irq" and
* ensure it is enabled in the interrupt controller with the right priority.
*/
#define DECLARE_IRQ(irq, routine, priority) \
void IRQ_HANDLER(irq)(void) __attribute__((naked)); \
void IRQ_HANDLER(irq)(void) \
{ \
asm volatile("mov r0, lr\n" \
/* Must push registers in pairs to keep 64-bit aligned*/\
/* stack for ARM EABI. */ \
"push {r0, %0}\n" \
bl_task_start_irq_handler \
"bl "#routine"\n" \
"pop {r2, r3}\n" \
/* read need_resched_or_profiling result after IRQ */ \
"ldr r0, [r3]\n" \
"mov r1, #8\n" \
"cmp r0, #0\n" \
/* if we need to go through the re-scheduling, go on */ \
"bne 2f\n" \
/* else return from exception */ \
"1: bx r2\n" \
/* check if that's a nested exception */ \
"2: tst r1, r2\n" \
/* if yes return immediatly */ \
"beq 1b\n" \
"push {r0, r2}\n" \
"mov r0, #0\n" \
"mov r1, #0\n" \
/* ensure we have priority 0 during re-scheduling */ \
"cpsid i\n isb\n" \
/* re-schedule the highest priority task */ \
"bl svc_handler\n" \
/* enable interrupts and return from exception */ \
"cpsie i\n" \
"pop {r0,pc}\n" \
: : "r"(&need_resched_or_profiling)); \
} \
const struct irq_priority IRQ_PRIORITY(irq) \
__attribute__((section(".rodata.irqprio"))) \
= {irq, priority}
#endif /* __IRQ_HANDLER_H */
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