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efibootaa64.c revision 1.7 
      1 /*	$NetBSD: efibootaa64.c,v 1.7 2024/08/15 06:15:17 skrll Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2016 Kimihiro Nonaka <nonaka (at) netbsd.org>
      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/cdefs.h>
     33 #include <sys/bootblock.h>
     34 
     35 #include <loadfile.h>
     36 
     37 /* cache.S */
     38 void aarch64_dcache_wbinv_range(vaddr_t, vsize_t);
     39 void aarch64_icache_inv_all(void);
     40 void aarch64_exec_kernel(paddr_t, paddr_t);
     41 
     42 void
     43 efi_dcache_flush(u_long start, u_long size)
     44 {
     45 	aarch64_dcache_wbinv_range(start, size);
     46 }
     47 
     48 void
     49 efi_boot_kernel(u_long marks[MARK_MAX])
     50 {
     51 	u_long kernel_start, kernel_size, kernel_entry;
     52 	u_long fdt_start, fdt_size;
     53 
     54 	kernel_start = marks[MARK_START];
     55 	kernel_size = marks[MARK_END] - kernel_start;
     56 	kernel_entry = marks[MARK_ENTRY];
     57 	fdt_start = (u_long)efi_fdt_data();
     58 	fdt_size = efi_fdt_size();
     59 
     60 	aarch64_dcache_wbinv_range(kernel_start, kernel_size);
     61 	if (efi_fdt_size() > 0) {
     62 		aarch64_dcache_wbinv_range(fdt_start, fdt_size);
     63 	}
     64 	aarch64_icache_inv_all();
     65 
     66 	aarch64_exec_kernel((paddr_t)kernel_entry, (paddr_t)fdt_start);
     67 }
     68 
     69 /*
     70  * Returns the current exception level.
     71  */
     72 static u_int
     73 efi_aarch64_current_el(void)
     74 {
     75 	uint64_t el;
     76 	__asm __volatile ("mrs %0, CurrentEL" : "=r" (el));
     77 	return (el >> 2) & 0x3;
     78 }
     79 
     80 static bool
     81 efi_aarch64_BigEnd(void)
     82 {
     83 	uint64_t id_aa64mmfr0_el1;
     84 	__asm __volatile ("mrs %[mmfr0], id_aa64mmfr0_el1"
     85             : [mmfr0] "=r" (id_aa64mmfr0_el1) :: "memory");
     86 	return __SHIFTOUT(id_aa64mmfr0_el1, __BITS(11, 8)) == 1;
     87 }
     88 
     89 void
     90 efi_md_show(void)
     91 {
     92 	command_printtab("CurrentEL", "EL%u\n", efi_aarch64_current_el());
     93 }
     94 
     95 int
     96 efi_md_prepare_boot(const char *fname, const char *args, u_long *marks)
     97 {
     98 	if (netbsd_elf_data == ELFDATA2MSB) {
     99 		if (!efi_aarch64_BigEnd()) {
    100 			printf("Processor does not support big endian at EL1\n");
    101 			return ENOTSUP;
    102 		}
    103 	}
    104 	return 0;
    105 }
    106