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      1 /* $NetBSD: efibootriscv64.c,v 1.2 2024/08/15 06:15:17 skrll Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2021 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include "../efiboot.h"
     30 #include "../efifdt.h"
     31 
     32 #include <sys/bootblock.h>
     33 
     34 #include <loadfile.h>
     35 #include <libfdt.h>
     36 
     37 typedef void (*riscv_kernel_entry_t)(register_t, register_t);
     38 
     39 static uint32_t
     40 efi_fdt_get_boot_hartid(void)
     41 {
     42 	const int chosen = fdt_path_offset(efi_fdt_data(), "/chosen");
     43 	const uint32_t *data;
     44 
     45 	data = fdt_getprop(efi_fdt_data(), chosen, "boot-hartid", NULL);
     46 	if (data == NULL) {
     47 		return 0;	/* XXX */
     48 	}
     49 
     50 	return fdt32_to_cpu(*data);
     51 }
     52 
     53 void
     54 efi_boot_kernel(u_long marks[MARK_MAX])
     55 {
     56 	riscv_kernel_entry_t entry_fn;
     57 	register_t hart_id; /* a0 */
     58 	register_t fdt_start; /* a1 */
     59 
     60 	entry_fn = (riscv_kernel_entry_t)(uintptr_t)marks[MARK_ENTRY];
     61 
     62 	hart_id = efi_fdt_get_boot_hartid();
     63 	fdt_start = (register_t)efi_fdt_data();
     64 
     65 	asm volatile("fence rw,rw; fence.i" ::: "memory");
     66 
     67 	entry_fn(hart_id, fdt_start);
     68 }
     69 
     70 void
     71 efi_md_show(void)
     72 {
     73 }
     74 
     75 void
     76 efi_dcache_flush(u_long start, u_long size)
     77 {
     78 }
     79 
     80 int
     81 efi_md_prepare_boot(const char *fname, const char *args, u_long *marks)
     82 {
     83 	return 0;
     84 }
     85