kernel/arch/arm64/include/arch/arch_ops.h

// Copyright 2016 The Fuchsia Authors
// Copyright (c) 2008-2014 Travis Geiselbrecht
//
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT

#pragma once

#ifndef __ASSEMBLER__

#include <arch/arm64.h>
#include <arch/arm64/feature.h>
#include <arch/arm64/interrupt.h>
#include <arch/arm64/mp.h>
#include <reg.h>
#include <stdbool.h>
#include <zircon/compiler.h>

__BEGIN_CDECLS

#define ENABLE_CYCLE_COUNTER 1

static inline void arch_spinloop_pause(void) {
    __asm__ volatile("yield" ::
                         : "memory");
}

#define mb() __asm__ volatile("dsb sy" \
                              :        \
                              :        \
                              : "memory")
#define smp_mb() __asm__ volatile("dmb ish" \
                                  :         \
                                  :         \
                                  : "memory")

static inline uint64_t arch_cycle_count(void) {
    return ARM64_READ_SYSREG(pmccntr_el0);
}

static inline uint32_t arch_cpu_features(void)
{
    return arm64_features;
}

static inline uint32_t arch_dcache_line_size(void) {
    return arm64_dcache_size;
}

static inline uint32_t arch_icache_line_size(void) {
    return arm64_icache_size;
}

// Log architecture-specific data for process creation.
// This can only be called after the process has been created and before
// it is running. Alas we can't use zx_koid_t here as the arch layer is at a
// lower level than zircon.
static inline void arch_trace_process_create(uint64_t pid, paddr_t tt_phys) {
    // nothing to do
}

__END_CDECLS

#endif // __ASSEMBLER__