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/*
* Copyright (c) 2017 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _ARM_CPU_ARMV6_H
#define _ARM_CPU_ARMV6_H
#if CONFIG_ARM_ARCH >= 6
#ifndef __ASSEMBLER__
#include <stdbool.h>
#include <stdnoreturn.h>
#include <kern/macros.h>
/*
* Enable local interrupts.
*
* Implies a compiler barrier.
*/
static __always_inline void
cpu_intr_enable(void)
{
asm volatile("cpsie i" : : : "memory", "cc");
}
/*
* Disable local interrupts.
*
* Implies a compiler barrier.
*/
static __always_inline void
cpu_intr_disable(void)
{
asm volatile("cpsid i" : : : "memory", "cc");
}
static __always_inline void
cpu_pause(void)
{
for (;;);
}
/*
* Make the CPU idle until the next interrupt.
*
* Implies a compiler barrier.
*/
static __always_inline void
cpu_idle(void)
{
asm volatile("wfi" : : : "memory");
}
noreturn static __always_inline void
cpu_halt(void)
{
cpu_intr_disable();
for (;;) {
cpu_idle();
}
}
#endif /* __ASSEMBLER__ */
#endif /* ARM_ARCH >= 6 */
#endif /* _ARM_CPU_ARMV6_H */
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