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tools/socfpgaimage.c
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/* * Copyright (C) 2014 Charles Manning <cdhmanning@gmail.com> * * SPDX-License-Identifier: GPL-2.0+ * * Reference doc http://www.altera.com.cn/literature/hb/cyclone-v/cv_5400A.pdf * Note this doc is not entirely accurate. Of particular interest to us is the * "header" length field being in U32s and not bytes. * * "Header" is a structure of the following format. * this is positioned at 0x40. * * Endian is LSB. * * Offset Length Usage * ----------------------- * 0x40 4 Validation word 0x31305341 * 0x44 1 Version (whatever, zero is fine) * 0x45 1 Flags (unused, zero is fine) * 0x46 2 Length (in units of u32, including the end checksum). * 0x48 2 Zero * 0x4A 2 Checksum over the header. NB Not CRC32 * * At the end of the code we have a 32-bit CRC checksum over whole binary * excluding the CRC. * * Note that the CRC used here is **not** the zlib/Adler crc32. It is the * CRC-32 used in bzip2, ethernet and elsewhere. * * The image is padded out to 64k, because that is what is * typically used to write the image to the boot medium. */ #include "pbl_crc32.h" #include "imagetool.h" #include "mkimage.h" #include <image.h> #define HEADER_OFFSET 0x40 #define VALIDATION_WORD 0x31305341 #define PADDED_SIZE 0x10000 /* To allow for adding CRC, the max input size is a bit smaller. */ #define MAX_INPUT_SIZE (PADDED_SIZE - sizeof(uint32_t)) static uint8_t buffer[PADDED_SIZE]; static struct socfpga_header { uint32_t validation; uint8_t version; uint8_t flags; uint16_t length_u32; uint16_t zero; uint16_t checksum; } header; /* * The header checksum is just a very simple checksum over * the header area. * There is still a crc32 over the whole lot. */ static uint16_t hdr_checksum(struct socfpga_header *header) { int len = sizeof(*header) - sizeof(header->checksum); uint8_t *buf = (uint8_t *)header; uint16_t ret = 0; while (--len) ret += *buf++; return ret; } static void build_header(uint8_t *buf, uint8_t version, uint8_t flags, uint16_t length_bytes) { header.validation = cpu_to_le32(VALIDATION_WORD); header.version = version; header.flags = flags; header.length_u32 = cpu_to_le16(length_bytes/4); header.zero = 0; header.checksum = cpu_to_le16(hdr_checksum(&header)); memcpy(buf, &header, sizeof(header)); } /* * Perform a rudimentary verification of header and return * size of image. */ static int verify_header(const uint8_t *buf) { memcpy(&header, buf, sizeof(header)); if (le32_to_cpu(header.validation) != VALIDATION_WORD) return -1; if (le16_to_cpu(header.checksum) != hdr_checksum(&header)) return -1; return le16_to_cpu(header.length_u32) * 4; } /* Sign the buffer and return the signed buffer size */ static int sign_buffer(uint8_t *buf, uint8_t version, uint8_t flags, int len, int pad_64k) { uint32_t calc_crc; /* Align the length up */ len = (len + 3) & (~3); /* Build header, adding 4 bytes to length to hold the CRC32. */ build_header(buf + HEADER_OFFSET, version, flags, len + 4); /* Calculate and apply the CRC */ calc_crc = ~pbl_crc32(0, (char *)buf, len); *((uint32_t *)(buf + len)) = cpu_to_le32(calc_crc); if (!pad_64k) return len + 4; return PADDED_SIZE; } /* Verify that the buffer looks sane */ static int verify_buffer(const uint8_t *buf) { int len; /* Including 32bit CRC */ uint32_t calc_crc; uint32_t buf_crc; len = verify_header(buf + HEADER_OFFSET); if (len < 0) { debug("Invalid header "); return -1; } if (len < HEADER_OFFSET || len > PADDED_SIZE) { debug("Invalid header length (%i) ", len); return -1; } /* * Adjust length to the base of the CRC. * Check the CRC. */ len -= 4; calc_crc = ~pbl_crc32(0, (const char *)buf, len); buf_crc = le32_to_cpu(*((uint32_t *)(buf + len))); if (buf_crc != calc_crc) { fprintf(stderr, "CRC32 does not match (%08x != %08x) ", buf_crc, calc_crc); return -1; } return 0; } /* mkimage glue functions */ static int socfpgaimage_verify_header(unsigned char *ptr, int image_size, struct image_tool_params *params) { if (image_size != PADDED_SIZE) return -1; return verify_buffer(ptr); } static void socfpgaimage_print_header(const void *ptr) { if (verify_buffer(ptr) == 0) printf("Looks like a sane SOCFPGA preloader "); else printf("Not a sane SOCFPGA preloader "); } static int socfpgaimage_check_params(struct image_tool_params *params) { /* Not sure if we should be accepting fflags */ return (params->dflag && (params->fflag || params->lflag)) || (params->fflag && (params->dflag || params->lflag)) || (params->lflag && (params->dflag || params->fflag)); } static int socfpgaimage_check_image_types(uint8_t type) { if (type == IH_TYPE_SOCFPGAIMAGE) return EXIT_SUCCESS; return EXIT_FAILURE; } /* * To work in with the mkimage framework, we do some ugly stuff... * * First, socfpgaimage_vrec_header() is called. * We prepend a fake header big enough to make the file PADDED_SIZE. * This gives us enough space to do what we want later. * * Next, socfpgaimage_set_header() is called. * We fix up the buffer by moving the image to the start of the buffer. * We now have some room to do what we need (add CRC and padding). */ static int data_size; #define FAKE_HEADER_SIZE (PADDED_SIZE - data_size) static int socfpgaimage_vrec_header(struct image_tool_params *params, struct image_type_params *tparams) { struct stat sbuf; if (params->datafile && stat(params->datafile, &sbuf) == 0 && sbuf.st_size <= MAX_INPUT_SIZE) { data_size = sbuf.st_size; tparams->header_size = FAKE_HEADER_SIZE; } return 0; } static void socfpgaimage_set_header(void *ptr, struct stat *sbuf, int ifd, struct image_tool_params *params) { uint8_t *buf = (uint8_t *)ptr; /* * This function is called after vrec_header() has been called. * At this stage we have the FAKE_HEADER_SIZE dummy bytes followed by * data_size image bytes. Total = PADDED_SIZE. * We need to fix the buffer by moving the image bytes back to * the beginning of the buffer, then actually do the signing stuff... */ memmove(buf, buf + FAKE_HEADER_SIZE, data_size); memset(buf + data_size, 0, FAKE_HEADER_SIZE); sign_buffer(buf, 0, 0, data_size, 0); } U_BOOT_IMAGE_TYPE( socfpgaimage, "Altera SOCFPGA preloader support", 0, /* This will be modified by vrec_header() */ (void *)buffer, socfpgaimage_check_params, socfpgaimage_verify_header, socfpgaimage_print_header, socfpgaimage_set_header, NULL, socfpgaimage_check_image_types, NULL, socfpgaimage_vrec_header ); |