1 /* $NetBSD: efibootaa64.c,v 1.7 2024/08/15 06:15:17 skrll Exp $ */ 2 3 /*- 4 * Copyright (c) 2016 Kimihiro Nonaka <nonaka@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