xref: /src/sys/stand/efiboot/bootaa64/efibootaa64.c

/*	$NetBSD: efibootaa64.c,v 1.3 2020/11/28 14:02:09 jmcneill Exp $	*/

/*-
 * Copyright (c) 2016 Kimihiro Nonaka <nonaka (at) netbsd.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
 */

#include "../efiboot.h"
#include "../efifdt.h"

#include <sys/bootblock.h>

#include <loadfile.h>

/* cache.S */
void aarch64_dcache_wbinv_range(vaddr_t, vsize_t);
void aarch64_icache_inv_all(void);
void aarch64_exec_kernel(paddr_t, paddr_t);

void
efi_dcache_flush(u_long start, u_long size)
{
	aarch64_dcache_wbinv_range(start, size);
}

void
efi_boot_kernel(u_long marks[MARK_MAX])
{
	void (*kernel_entry)(register_t, register_t, register_t, register_t);
	u_long kernel_size;

	kernel_entry = (void *)marks[MARK_ENTRY];
	kernel_size = marks[MARK_END] - marks[MARK_START];

	aarch64_dcache_wbinv_range((u_long)kernel_entry, kernel_size);
	if (efi_fdt_size() > 0)
		aarch64_dcache_wbinv_range((u_long)efi_fdt_data(), efi_fdt_size());
	aarch64_icache_inv_all();

	aarch64_exec_kernel((paddr_t)marks[MARK_ENTRY], (paddr_t)efi_fdt_data());
}

/*
 * Returns the current exception level.
 */
static u_int
efi_aarch64_current_el(void)
{
	uint64_t el;
	__asm __volatile ("mrs %0, CurrentEL" : "=r" (el));
	return (el >> 2) & 0x3;
}

void
efi_md_show(void)
{
	printf("Current Exception Level: EL%u\n", efi_aarch64_current_el());
}