/* * 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 /** @} */