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/*
 * Copyright (c) 2016 Jean-Paul Etienne <fractalclone@gmail.com>
 *
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * @file
 * @brief Private kernel definitions
 *
 * This file contains private kernel function/macro definitions and various
 * other definitions for the RISCV processor architecture.
 */

#ifndef ZEPHYR_ARCH_RISCV_INCLUDE_KERNEL_ARCH_FUNC_H_
#define ZEPHYR_ARCH_RISCV_INCLUDE_KERNEL_ARCH_FUNC_H_

#include <kernel_arch_data.h>
#include <pmp.h>

#ifdef __cplusplus
extern "C" {
#endif

#ifndef _ASMLANGUAGE

static ALWAYS_INLINE void arch_kernel_init(void)
{
#ifdef CONFIG_THREAD_LOCAL_STORAGE
	__asm__ volatile ("li tp, 0");
#endif
#ifdef CONFIG_USERSPACE
	csr_write(mscratch, 0);
#endif
#ifdef CONFIG_RISCV_PMP
	z_riscv_pmp_init();
#endif
}

static ALWAYS_INLINE void
arch_switch(void *switch_to, void **switched_from)
{
	extern void z_riscv_switch(struct k_thread *new, struct k_thread *old);
	struct k_thread *new = switch_to;
	struct k_thread *old = CONTAINER_OF(switched_from, struct k_thread,
					    switch_handle);
#ifdef CONFIG_RISCV_ALWAYS_SWITCH_THROUGH_ECALL
	arch_syscall_invoke2((uintptr_t)new, (uintptr_t)old, RV_ECALL_SCHEDULE);
#else
	z_riscv_switch(new, old);
#endif
}

FUNC_NORETURN void z_riscv_fatal_error(unsigned int reason,
				       const z_arch_esf_t *esf);

static inline bool arch_is_in_isr(void)
{
#ifdef CONFIG_SMP
	unsigned int key = arch_irq_lock();
	bool ret = arch_curr_cpu()->nested != 0U;

	arch_irq_unlock(key);
	return ret;
#else
	return _kernel.cpus[0].nested != 0U;
#endif
}

extern FUNC_NORETURN void z_riscv_userspace_enter(k_thread_entry_t user_entry,
						 void *p1, void *p2, void *p3,
						 uint32_t stack_end,
						 uint32_t stack_start);

#ifdef CONFIG_IRQ_OFFLOAD
int z_irq_do_offload(void);
#endif

#endif /* _ASMLANGUAGE */

#ifdef __cplusplus
}
#endif

#endif /* ZEPHYR_ARCH_RISCV_INCLUDE_KERNEL_ARCH_FUNC_H_ */