/*
* Copyright (c) 2015 Petr Pavlu
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* - The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/** @addtogroup kernel_arm64
* @{
*/
/** @file
* @brief Declarations of functions implemented in assembly.
*/
#ifndef KERN_arm64_ASM_H_
#define KERN_arm64_ASM_H_
#include <config.h>
#include <trace.h>
extern char exc_vector;
/*
* Note: Function asm_delay_loop() is defined in arm64.c but declared here
* because the generic kernel code expects it in arch/asm.h.
*/
extern void asm_delay_loop(uint32_t usec);
/** CPU specific way to sleep cpu. */
_NO_TRACE static inline void cpu_sleep(void)
{
asm volatile ("wfe");
}
/** Enables interrupts and blocks until an interrupt arrives,
* atomically if possible on target architecture.
* Disables interrupts again before returning to caller.
*/
_NO_TRACE static inline void cpu_interruptible_sleep(void)
{
// FIXME: do this atomically
interrupts_enable();
cpu_sleep();
interrupts_disable();
}
/** Halts CPU. */
_NO_TRACE static inline __attribute__((noreturn)) void cpu_halt(void)
{
while (true)
;
}
_NO_TRACE static inline void cpu_spin_hint(void)
{
asm volatile ("yield");
}
/** Output byte to port.
*
* @param port Port to write to.
* @param val Value to write.
*/
_NO_TRACE static inline void pio_write_8(ioport8_t *port, uint8_t val)
{
*port = val;
}
/** Output half-word to port.
*
* @param port Port to write to.
* @param val Value to write.
*/
_NO_TRACE static inline void pio_write_16(ioport16_t *port, uint16_t val)
{
*port = val;
}
/** Output word to port.
*
* @param port Port to write to.
* @param val Value to write.
*/
_NO_TRACE static inline void pio_write_32(ioport32_t *port, uint32_t val)
{
*port = val;
}
/** Get byte from port.
*
* @param port Port to read from.
* @return Value read.
*/
_NO_TRACE static inline uint8_t pio_read_8(const ioport8_t *port)
{
return *port;
}
/** Get word from port.
*
* @param port Port to read from.
* @return Value read.
*/
_NO_TRACE static inline uint16_t pio_read_16(const ioport16_t *port)
{
return *port;
}
/** Get double word from port.
*
* @param port Port to read from.
* @return Value read.
*/
_NO_TRACE static inline uint32_t pio_read_32(const ioport32_t *port)
{
return *port;
}
#endif
/** @}
*/