Szymon Starzycki | 3d86b01 | 2013-07-15 15:17:07 -0700 | [diff] [blame] | 1 | #include <errno.h> |
| 2 | #include <getopt.h> |
| 3 | #include <fcntl.h> |
| 4 | #include <sys/mman.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <stdio.h> |
| 7 | #include <sys/stat.h> |
| 8 | #include <sys/syscall.h> |
| 9 | #include <sys/types.h> |
| 10 | #include <sys/wait.h> |
| 11 | #include <unistd.h> |
| 12 | |
| 13 | #include "kexec.h" |
| 14 | |
| 15 | // Offsets same as in kernel asm/kexec.h |
| 16 | #define KEXEC_ARM_ATAGS_OFFSET 0x1000 |
| 17 | #define KEXEC_ARM_ZIMAGE_OFFSET 0x8000 |
| 18 | |
| 19 | #define MEMORY_SIZE 0x0800000 |
| 20 | // Physical buffer address cannot overlap with other regions |
| 21 | #define START_ADDRESS 0x44000000 |
| 22 | |
| 23 | #define ROUND_TO_PAGE(address,pagesize) ((address + pagesize - 1) & (~(pagesize - 1))) |
| 24 | |
| 25 | /* |
| 26 | * Gives file position and resets current position to begining of file |
| 27 | */ |
| 28 | int get_file_size(int f) |
| 29 | { |
| 30 | struct stat st; |
| 31 | fstat(f, &st); |
| 32 | return st.st_size; |
| 33 | } |
| 34 | |
| 35 | int test_kexeccall() { |
| 36 | int rv; |
| 37 | |
| 38 | rv = kexec_load(0, 0, NULL, KEXEC_ARCH_DEFAULT); |
| 39 | |
| 40 | if (rv != 0) { |
| 41 | printf("ERROR: kexec_load: %d \n", errno); |
| 42 | return 1; |
| 43 | } |
| 44 | |
| 45 | printf("Kexec test: Success \n"); |
| 46 | |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | void usage(void) |
| 51 | { |
| 52 | fprintf(stderr, |
| 53 | "usage: kexecload [ <option> ] <atags path> <kernel path>\n" |
| 54 | "\n" |
| 55 | "options:\n" |
| 56 | " -t tests syscall\n" |
| 57 | " -s <start address> specify start address of kernel\n" |
| 58 | ); |
| 59 | } |
| 60 | |
| 61 | /* |
| 62 | * Loads kexec into the kernel and sets kexec on crash |
| 63 | */ |
| 64 | int main(int argc, char *argv[]) |
| 65 | { |
| 66 | int rv; |
| 67 | int atag_file, |
| 68 | zimage_file; |
| 69 | int atag_size, |
| 70 | zimage_size, |
| 71 | total_size; |
| 72 | void *atag_buffer; |
| 73 | void *zimage_buffer; |
| 74 | struct kexec_segment segment[2]; |
| 75 | int page_size = getpagesize(); |
| 76 | void *start_address = (void *)START_ADDRESS; |
| 77 | int c; |
| 78 | |
| 79 | const struct option longopts[] = { |
| 80 | {"start_address", required_argument, 0, 's'}, |
| 81 | {"test", 0, 0, 't'}, |
| 82 | {"help", 0, 0, 'h'}, |
| 83 | {0, 0, 0, 0} |
| 84 | }; |
| 85 | |
| 86 | while (1) { |
| 87 | int option_index = 0; |
| 88 | c = getopt_long(argc, argv, "s:th", longopts, NULL); |
| 89 | if (c < 0) { |
| 90 | break; |
| 91 | } |
| 92 | /* Alphabetical cases */ |
| 93 | switch (c) { |
| 94 | case 's': |
| 95 | start_address = (void *) strtoul(optarg, 0, 16); |
| 96 | break; |
| 97 | case 'h': |
| 98 | usage(); |
| 99 | return 1; |
| 100 | case 't': |
| 101 | test_kexeccall(); |
| 102 | return 1; |
| 103 | case '?': |
| 104 | return 1; |
| 105 | default: |
| 106 | abort(); |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | argc -= optind; |
| 111 | argv += optind; |
| 112 | |
| 113 | if (argc < 2) { |
| 114 | usage(); |
| 115 | return 1; |
| 116 | } |
| 117 | |
| 118 | atag_file = open(argv[0], O_RDONLY); |
| 119 | zimage_file = open(argv[1], O_RDONLY); |
| 120 | |
| 121 | if (atag_file < 0 || zimage_file < 0) { |
| 122 | fprintf(stderr, "Error during opening of atag file or the zImage file %s\n", strerror(errno)); |
| 123 | return 1; |
| 124 | } |
| 125 | |
| 126 | atag_size = ROUND_TO_PAGE(get_file_size(atag_file), page_size); |
| 127 | zimage_size = ROUND_TO_PAGE(get_file_size(zimage_file), page_size); |
| 128 | |
| 129 | if (atag_size >= KEXEC_ARM_ZIMAGE_OFFSET - KEXEC_ARM_ATAGS_OFFSET) { |
| 130 | fprintf(stderr, "Atag file is too large\n"); |
| 131 | return 1; |
| 132 | } |
| 133 | |
| 134 | atag_buffer = (char *) mmap(NULL, atag_size, PROT_READ, MAP_POPULATE | MAP_PRIVATE, atag_file, 0); |
| 135 | zimage_buffer = (char *) mmap(NULL, zimage_size, PROT_READ, MAP_POPULATE | MAP_PRIVATE, zimage_file, 0); |
| 136 | |
| 137 | if(atag_buffer == MAP_FAILED || zimage_buffer == MAP_FAILED) { |
| 138 | fprintf(stderr, "Unable to map files into memory"); |
| 139 | return 1; |
| 140 | } |
| 141 | |
| 142 | segment[0].buf = zimage_buffer; |
| 143 | segment[0].bufsz = zimage_size; |
Colin Cross | 1070ada | 2014-02-05 18:57:04 -0800 | [diff] [blame] | 144 | segment[0].mem = (void *) ((uintptr_t) start_address + KEXEC_ARM_ZIMAGE_OFFSET); |
Szymon Starzycki | 3d86b01 | 2013-07-15 15:17:07 -0700 | [diff] [blame] | 145 | segment[0].memsz = zimage_size; |
| 146 | |
| 147 | segment[1].buf = atag_buffer; |
| 148 | segment[1].bufsz = atag_size; |
Colin Cross | 1070ada | 2014-02-05 18:57:04 -0800 | [diff] [blame] | 149 | segment[1].mem = (void *) ((uintptr_t) start_address + KEXEC_ARM_ATAGS_OFFSET); |
Szymon Starzycki | 3d86b01 | 2013-07-15 15:17:07 -0700 | [diff] [blame] | 150 | segment[1].memsz = atag_size; |
| 151 | |
Colin Cross | 1070ada | 2014-02-05 18:57:04 -0800 | [diff] [blame] | 152 | rv = kexec_load(((uintptr_t) start_address + KEXEC_ARM_ZIMAGE_OFFSET), |
Szymon Starzycki | 3d86b01 | 2013-07-15 15:17:07 -0700 | [diff] [blame] | 153 | 2, (void *) segment, KEXEC_ARCH_DEFAULT | KEXEC_ON_CRASH); |
| 154 | |
| 155 | if (rv != 0) { |
| 156 | fprintf(stderr, "Kexec_load returned non-zero exit code: %d with errno %d\n", rv, errno); |
| 157 | return 1; |
| 158 | } |
| 159 | |
| 160 | printf("Done! Kexec loaded\n"); |
| 161 | printf("New kernel should start at 0x%08x\n", START_ADDRESS + KEXEC_ARM_ZIMAGE_OFFSET); |
| 162 | |
| 163 | return 0; |
| 164 | |
| 165 | } |
| 166 | |