/* * ===================================================================================== * * Filename: gen_misc_data.c * * Description: * * Version: 1.0 * Created: 02/21/2019 08:01:16 PM * Revision: none * Compiler: gcc * * Author: manliang.tang (mn), * Company: * * ===================================================================================== */ #include #include typedef unsigned char uint8_t; typedef unsigned int uint32_t; /* Magic for the A/B struct when serialized. */ #define AVB_AB_MAGIC "\0AB0" #define AVB_AB_MAGIC_LEN 4 /* Versioning for the on-disk A/B metadata - keep in sync with avbtool. */ #define AVB_AB_MAJOR_VERSION 1 #define AVB_AB_MINOR_VERSION 0 /* Size of avb_ab_data struct. */ #define AVB_AB_DATA_SIZE 32 /* Maximum values for slot data */ #define AVB_AB_MAX_PRIORITY 15 #define AVB_AB_MAX_TRIES_REMAINING 3 struct AvbABSlotData { /* Slot priority. Valid values range from 0 to AVB_AB_MAX_PRIORITY, * both inclusive with 1 being the lowest and AVB_AB_MAX_PRIORITY * being the highest. The special value 0 is used to indicate the * slot is unbootable. */ uint8_t priority; /* Number of times left attempting to boot this slot ranging from 0 * to AVB_AB_MAX_TRIES_REMAINING. */ uint8_t tries_remaining; /* Non-zero if this slot has booted successfully, 0 otherwise. */ uint8_t successful_boot; /* Reserved for future use. */ uint8_t reserved[1]; } __attribute__((packed)); /* Struct used for recording A/B metadata. * * When serialized, data is stored in network byte-order. */ struct AvbABData { /* Magic number used for identification - see AVB_AB_MAGIC. */ uint8_t magic[AVB_AB_MAGIC_LEN]; /* Version of on-disk struct - see AVB_AB_{MAJOR,MINOR}_VERSION. */ uint8_t version_major; uint8_t version_minor; /* Padding to ensure |slots| field start eight bytes in. */ uint8_t reserved1[2]; /* Per-slot metadata. */ struct AvbABSlotData slots[2]; /* Reserved for future use. */ uint8_t reserved2[12]; /* CRC32 of all 28 bytes preceding this field. */ uint32_t crc32; } __attribute__((packed)); /* The slot_suffix field is used for A/B implementations. * Offset 0 from the beginning of misc partition */ struct ab_settings { struct AvbABData ab_data; // 32 bytes //Round up the entire struct to 4096-byte. char reserved[4064]; }; /* Code taken from FreeBSD 8 */ static uint32_t iavb_crc32_tab[] = { 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d}; /* * A function that calculates the CRC-32 based on the table above is * given below for documentation purposes. An equivalent implementation * of this function that's actually used in the kernel can be found * in sys/libkern.h, where it can be inlined. */ static uint32_t iavb_crc32(uint32_t crc_in, const uint8_t* buf, int size) { const uint8_t* p = buf; uint32_t crc; crc = crc_in ^ ~0U; while (size--) crc = iavb_crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8); return crc ^ ~0U; } uint32_t avb_crc32(const uint8_t* buf, size_t size) { return iavb_crc32(0, buf, size); } uint32_t avb_htobe32(uint32_t in) { union { uint32_t word; uint8_t bytes[4]; } ret; ret.bytes[0] = (in >> 24) & 0xff; ret.bytes[1] = (in >> 16) & 0xff; ret.bytes[2] = (in >> 8) & 0xff; ret.bytes[3] = in & 0xff; return ret.word; } int reflect(int data, int len) { int ref = 0; int i; for (i = 0; i < len; i++) { if (data & 0x1) { ref |= (1 << ((len - 1) - i)); } data = (data >> 1); } return ref; } uint32_t calculate_crc32(void* buf, uint32_t len) { uint32_t i, j; uint32_t byte_length = 8; /*length of unit (i.e. byte) */ int msb = 0; int polynomial = 0x04C11DB7; /* IEEE 32bit polynomial */ unsigned int regs = 0xFFFFFFFF; /* init to all ones */ int regs_mask = 0xFFFFFFFF; /* ensure only 32 bit answer */ int regs_msb = 0; unsigned int reflected_regs; for (i = 0; i < len; i++) { int data_byte = *((uint8_t*)buf + i); data_byte = reflect(data_byte, 8); for (j = 0; j < byte_length; j++) { msb = data_byte >> (byte_length - 1); /* get MSB */ msb &= 1; /* ensure just 1 bit */ regs_msb = (regs >> 31) & 1; /* MSB of regs */ regs = regs << 1; /* shift regs for CRC-CCITT */ if (regs_msb ^ msb) { /* MSB is a 1 */ regs = regs ^ polynomial; /* XOR with generator poly */ } regs = regs & regs_mask; /* Mask off excess upper bits */ data_byte <<= 1; /* get to next bit */ } } regs = regs & regs_mask; reflected_regs = reflect(regs, 32) ^ 0xFFFFFFFF; return reflected_regs; } void main(int argc, char **argv) { int size = 0; int len = 0; char test_data[]="1234"; unsigned int crc32; unsigned int crc32_check; unsigned int crc32_verify; FILE *file = NULL; int ret = -1; char *output_file = "misc.img"; struct ab_settings ab_setting_default; int i, ab = 0, retry = AVB_AB_MAX_TRIES_REMAINING; if (argc > 4) { show_usage: printf("usage:\n" "\tgen_misc_data -a/b -r [n]\n" "\t-a boot from a\n" "\t-b boot from b\n" "\t-r retry count\n"); exit(-1); } for (i = 1; i < argc; i++) { if (!strcmp(argv[i], "-a")) { ab = 0; continue; } if (!strcmp(argv[i], "-b")) { ab = 1; continue; } if (!strcmp(argv[i], "-r")) { if (i + 1 > argc) { goto show_usage; } retry = atoi(argv[i + 1]); i++; continue; } goto show_usage; } /* data init */ memset(&ab_setting_default, '\0', sizeof(struct ab_settings)); memcpy(ab_setting_default.ab_data.magic, AVB_AB_MAGIC, AVB_AB_MAGIC_LEN); ab_setting_default.ab_data.version_major = AVB_AB_MAJOR_VERSION; ab_setting_default.ab_data.version_minor = AVB_AB_MINOR_VERSION; if (ab) { // from b ab_setting_default.ab_data.slots[0].priority = AVB_AB_MAX_PRIORITY - 1; ab_setting_default.ab_data.slots[1].priority = AVB_AB_MAX_PRIORITY; } else { // from a ab_setting_default.ab_data.slots[0].priority = AVB_AB_MAX_PRIORITY; ab_setting_default.ab_data.slots[1].priority = AVB_AB_MAX_PRIORITY - 1; } ab_setting_default.ab_data.slots[0].tries_remaining = retry; ab_setting_default.ab_data.slots[0].successful_boot = 0; ab_setting_default.ab_data.slots[1].tries_remaining = retry; ab_setting_default.ab_data.slots[1].successful_boot = 0; printf("magic = %s\n", ab_setting_default.ab_data.magic); printf("major version:%d\n", ab_setting_default.ab_data.version_major); crc32 = avb_crc32((const uint8_t*)(&ab_setting_default.ab_data), sizeof(struct AvbABData) - sizeof(uint32_t)); printf("crc32:0x%x\n", crc32); ab_setting_default.ab_data.crc32= crc32; crc32_check= calculate_crc32("1", 1); crc32_check = avb_htobe32(crc32_check); printf("crc32_check:0x%x\n", crc32_check); //ab_setting_default.ab_data.crc32= crc32_check; crc32_verify= calculate_crc32((void *)(&ab_setting_default.ab_data), AVB_AB_DATA_SIZE); printf("crc32_verify:0x%x\n", crc32_verify); size = sizeof(ab_setting_default); printf("ab_data size:%d\n", size); file = fopen(output_file, "wb+"); if(file == NULL) { printf("open file %s failure\n", output_file); return; } fseek(file, 0, SEEK_SET); fwrite((void *)&ab_setting_default, size, 1, file); fclose(file); }