Szymon Starzycki | e160f81 | 2013-07-24 17:08:04 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2009-2013, Google Inc. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * * Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * * Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in |
| 12 | * the documentation and/or other materials provided with the |
| 13 | * distribution. |
| 14 | * * Neither the name of Google, Inc. nor the names of its contributors |
| 15 | * may be used to endorse or promote products derived from this |
| 16 | * software without specific prior written permission. |
| 17 | * |
| 18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 19 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 20 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 21 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 22 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 24 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
| 25 | * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 26 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 27 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 28 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 29 | * SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | #include <sys/syscall.h> |
| 33 | #include <stdio.h> |
| 34 | #include <string.h> |
| 35 | #include <fcntl.h> |
| 36 | #include <unistd.h> |
| 37 | |
| 38 | #include "boot.h" |
| 39 | #include "debug.h" |
| 40 | #include "utils.h" |
| 41 | #include "bootimg.h" |
| 42 | |
| 43 | |
| 44 | #define KEXEC_ARM_ATAGS_OFFSET 0x1000 |
| 45 | #define KEXEC_ARM_ZIMAGE_OFFSET 0x8000 |
| 46 | |
| 47 | #define MEMORY_SIZE 0x0800000 |
| 48 | #define START_ADDRESS 0x44000000 |
| 49 | #define KERNEL_START (START_ADDRESS + KEXEC_ARM_ZIMAGE_OFFSET) |
| 50 | |
| 51 | #define ATAG_NONE_TYPE 0x00000000 |
| 52 | #define ATAG_CORE_TYPE 0x54410001 |
| 53 | #define ATAG_RAMDISK_TYPE 0x54410004 |
| 54 | #define ATAG_INITRD2_TYPE 0x54420005 |
| 55 | #define ATAG_CMDLINE_TYPE 0x54410009 |
| 56 | |
| 57 | #define MAX_ATAG_SIZE 0x4000 |
| 58 | |
| 59 | struct atag_info { |
| 60 | unsigned size; |
| 61 | unsigned type; |
| 62 | }; |
| 63 | |
| 64 | struct atag_initrd2 { |
| 65 | unsigned start; |
| 66 | unsigned size; |
| 67 | }; |
| 68 | |
| 69 | struct atag_cmdline { |
| 70 | char cmdline[0]; |
| 71 | }; |
| 72 | |
| 73 | struct atag { |
| 74 | struct atag_info info; |
| 75 | union { |
| 76 | struct atag_initrd2 initrd2; |
| 77 | struct atag_cmdline cmdline; |
| 78 | } data; |
| 79 | }; |
| 80 | |
| 81 | |
| 82 | long kexec_load(unsigned int entry, unsigned long nr_segments, |
| 83 | struct kexec_segment *segment, unsigned long flags) { |
| 84 | return syscall(__NR_kexec_load, entry, nr_segments, segment, flags); |
| 85 | } |
| 86 | |
| 87 | /* |
| 88 | * Prepares arguments for kexec |
| 89 | * Kernel address is not set into kernel_phys |
| 90 | * Ramdisk is set to position relative to kernel |
| 91 | */ |
| 92 | int prepare_boot_linux(unsigned kernel_phys, void *kernel_addr, int kernel_size, |
| 93 | unsigned ramdisk_phys, void *ramdisk_addr, int ramdisk_size, |
| 94 | unsigned second_phys, void *second_addr, int second_size, |
| 95 | unsigned atags_phys, void *atags_addr, int atags_size) { |
| 96 | struct kexec_segment segment[4]; |
| 97 | int segment_count = 2; |
| 98 | unsigned entry = START_ADDRESS + KEXEC_ARM_ZIMAGE_OFFSET; |
| 99 | int rv; |
| 100 | int page_size = getpagesize(); |
| 101 | |
| 102 | segment[0].buf = kernel_addr; |
| 103 | segment[0].bufsz = kernel_size; |
| 104 | segment[0].mem = (void *) KERNEL_START; |
| 105 | segment[0].memsz = ROUND_TO_PAGE(kernel_size, page_size); |
| 106 | |
| 107 | if (kernel_size > MEMORY_SIZE - KEXEC_ARM_ZIMAGE_OFFSET) { |
| 108 | D(INFO, "Kernel image too big"); |
| 109 | return -1; |
| 110 | } |
| 111 | |
| 112 | segment[1].buf = atags_addr; |
| 113 | segment[1].bufsz = atags_size; |
| 114 | segment[1].mem = (void *) (START_ADDRESS + KEXEC_ARM_ATAGS_OFFSET); |
| 115 | segment[1].memsz = ROUND_TO_PAGE(atags_size, page_size); |
| 116 | |
| 117 | D(INFO, "Ramdisk size is %d", ramdisk_size); |
| 118 | |
| 119 | if (ramdisk_size != 0) { |
| 120 | segment[segment_count].buf = ramdisk_addr; |
| 121 | segment[segment_count].bufsz = ramdisk_size; |
| 122 | segment[segment_count].mem = (void *) (KERNEL_START + ramdisk_phys - kernel_phys); |
| 123 | segment[segment_count].memsz = ROUND_TO_PAGE(ramdisk_phys, page_size); |
| 124 | ++segment_count; |
| 125 | } |
| 126 | |
| 127 | D(INFO, "Ramdisk size is %d", ramdisk_size); |
| 128 | if (second_size != 0) { |
| 129 | segment[segment_count].buf = second_addr; |
| 130 | segment[segment_count].bufsz = second_size; |
| 131 | segment[segment_count].mem = (void *) (KERNEL_START + second_phys - kernel_phys); |
| 132 | segment[segment_count].memsz = ROUND_TO_PAGE(second_size, page_size); |
| 133 | entry = second_phys; |
| 134 | ++segment_count; |
| 135 | } |
| 136 | |
| 137 | rv = kexec_load(entry, segment_count, segment, KEXEC_ARCH_DEFAULT); |
| 138 | |
| 139 | if (rv != 0) { |
| 140 | D(INFO, "Kexec_load returned non-zero exit code: %s\n", strerror(errno)); |
| 141 | return -1; |
| 142 | } |
| 143 | |
| 144 | return 1; |
| 145 | |
| 146 | } |
| 147 | |
| 148 | unsigned *create_atags(unsigned *atags_position, int atag_size, const struct boot_img_hdr *hdr, int *size) { |
| 149 | struct atag *current_tag = (struct atag *) atags_position; |
| 150 | unsigned *current_tag_raw = atags_position; |
| 151 | unsigned *new_atags = malloc(ROUND_TO_PAGE(atag_size + BOOT_ARGS_SIZE * sizeof(char), |
| 152 | hdr->page_size)); |
| 153 | //This pointer will point into the beggining of buffer free space |
| 154 | unsigned *natags_raw_buff = new_atags; |
| 155 | int new_atags_size = 0; |
| 156 | int current_size; |
| 157 | int cmdl_length; |
| 158 | |
| 159 | // copy tags from current atag file |
| 160 | while (current_tag->info.type != ATAG_NONE_TYPE) { |
| 161 | switch (current_tag->info.type) { |
| 162 | case ATAG_CMDLINE_TYPE: |
| 163 | case ATAG_RAMDISK_TYPE: |
| 164 | case ATAG_INITRD2_TYPE: break; |
| 165 | default: |
| 166 | memcpy((void *)natags_raw_buff, (void *)current_tag_raw, current_tag->info.size * sizeof(unsigned)); |
| 167 | natags_raw_buff += current_tag->info.size; |
| 168 | new_atags_size += current_tag->info.size; |
| 169 | } |
| 170 | |
| 171 | current_tag_raw += current_tag->info.size; |
| 172 | current_tag = (struct atag *) current_tag_raw; |
| 173 | |
| 174 | if (current_tag_raw >= atags_position + atag_size) { |
| 175 | D(ERR, "Critical error in atags"); |
| 176 | return NULL; |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | // set INITRD2 tag |
| 181 | if (hdr->ramdisk_size > 0) { |
| 182 | current_size = (sizeof(struct atag_info) + sizeof(struct atag_initrd2)) / sizeof(unsigned); |
| 183 | *((struct atag *) natags_raw_buff) = (struct atag) { |
| 184 | .info = { |
| 185 | .size = current_size, |
| 186 | .type = ATAG_INITRD2_TYPE |
| 187 | }, |
| 188 | .data = { |
| 189 | .initrd2 = (struct atag_initrd2) { |
| 190 | .start = hdr->ramdisk_addr, |
| 191 | .size = hdr->ramdisk_size |
| 192 | } |
| 193 | } |
| 194 | }; |
| 195 | |
| 196 | new_atags_size += current_size; |
| 197 | natags_raw_buff += current_size; |
| 198 | } |
| 199 | |
| 200 | // set ATAG_CMDLINE |
| 201 | cmdl_length = strnlen((char *) hdr->cmdline, BOOT_ARGS_SIZE - 1); |
| 202 | current_size = sizeof(struct atag_info) + (1 + cmdl_length); |
| 203 | current_size = (current_size + sizeof(unsigned) - 1) / sizeof(unsigned); |
| 204 | *((struct atag *) natags_raw_buff) = (struct atag) { |
| 205 | .info = { |
| 206 | .size = current_size, |
| 207 | .type = ATAG_CMDLINE_TYPE |
| 208 | }, |
| 209 | }; |
| 210 | |
| 211 | //copy cmdline and ensure that there is null character |
| 212 | memcpy(((struct atag *) natags_raw_buff)->data.cmdline.cmdline, |
| 213 | (char *) hdr->cmdline, cmdl_length); |
| 214 | ((struct atag *) natags_raw_buff)->data.cmdline.cmdline[cmdl_length] = '\0'; |
| 215 | |
| 216 | new_atags_size += current_size; |
| 217 | natags_raw_buff += current_size; |
| 218 | |
| 219 | // set ATAG_NONE |
| 220 | *((struct atag *) natags_raw_buff) = (struct atag) { |
| 221 | .info = { |
| 222 | .size = 0, |
| 223 | .type = ATAG_NONE_TYPE |
| 224 | }, |
| 225 | }; |
| 226 | new_atags_size += sizeof(struct atag_info) / sizeof(unsigned); |
| 227 | natags_raw_buff += sizeof(struct atag_info) / sizeof(unsigned); |
| 228 | |
| 229 | *size = new_atags_size * sizeof(unsigned); |
| 230 | return new_atags; |
| 231 | } |
| 232 | |
| 233 | char *read_atags(const char * path, int *atags_sz) { |
| 234 | int afd = -1; |
| 235 | char *atags_ptr = NULL; |
| 236 | |
| 237 | afd = open(path, O_RDONLY); |
| 238 | if (afd < 0) { |
| 239 | D(ERR, "wrong atags file"); |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | atags_ptr = (char *) malloc(MAX_ATAG_SIZE); |
| 244 | if (atags_ptr == NULL) { |
| 245 | D(ERR, "insufficient memory"); |
| 246 | return 0; |
| 247 | } |
| 248 | |
| 249 | *atags_sz = read(afd, atags_ptr, MAX_ATAG_SIZE); |
| 250 | |
| 251 | close(afd); |
| 252 | return atags_ptr; |
| 253 | } |
| 254 | |