// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2015 Google,  Inc
 * Written by Simon Glass <sjg@chromium.org>
 *
 * (C) 2017 Theobroma Systems Design und Consulting GmbH
 *
 * Helper functions for Rockchip images
 */

#include "imagetool.h"
#include <image.h>
#include <u-boot/sha256.h>
#include <rc4.h>
#include "mkimage.h"
#include "rkcommon.h"

enum {
        RK_MAGIC                = 0x0ff0aa55,
        RK_MAGIC_V2             = 0x534E4B52,
};

enum {
        RK_HEADER_V1    = 1,
        RK_HEADER_V2    = 2,
};

enum hash_type {
        HASH_NONE       = 0,
        HASH_SHA256     = 1,
        HASH_SHA512     = 2,
};

/**
 * struct image_entry
 *
 * @size_and_off:       [31:16]image size;[15:0]image offset
 * @address:    default as 0xFFFFFFFF
 * @flag:       no use
 * @counter:    no use
 * @hash:       hash of image
 *
 */
struct image_entry {
        uint32_t size_and_off;
        uint32_t address;
        uint32_t flag;
        uint32_t counter;
        uint8_t reserved[8];
        uint8_t hash[64];
};

/**
 * struct header0_info_v2 - v2 header block for rockchip BootRom
 *
 * This is stored at SD card block 64 (where each block is 512 bytes)
 *
 * @magic:      Magic (must be RK_MAGIC_V2)
 * @size_and_nimage:    [31:16]number of images;[15:0]
 *                      offset to hash field of header(unit as 4Byte)
 * @boot_flag:  [3:0]hash type(0:none,1:sha256,2:sha512)
 * @signature:  hash or signature for header info
 *
 */
struct header0_info_v2 {
        uint32_t magic;
        uint8_t reserved[4];
        uint32_t size_and_nimage;
        uint32_t boot_flag;
        uint8_t reserved1[104];
        struct image_entry images[4];
        uint8_t reserved2[1064];
        uint8_t hash[512];
};

/**
 * struct header0_info - header block for boot ROM
 *
 * This is stored at SD card block 64 (where each block is 512 bytes, or at
 * the start of SPI flash. It is encoded with RC4.
 *
 * @magic:              Magic (must be RK_MAGIC)
 * @disable_rc4:        0 to use rc4 for boot image,  1 to use plain binary
 * @init_offset:        Offset in blocks of the SPL code from this header
 *                      block. E.g. 4 means 2KB after the start of this header.
 * Other fields are not used by U-Boot
 */
struct header0_info {
        uint32_t magic;
        uint8_t reserved[4];
        uint32_t disable_rc4;
        uint16_t init_offset;
        uint8_t reserved1[492];
        uint16_t init_size;
        uint16_t init_boot_size;
        uint8_t reserved2[2];
};

/**
 * struct header1_info
 */
struct header1_info {
        uint32_t magic;
};

/**
 * struct spl_info - spl info for each chip
 *
 * @imagename:          Image name(passed by "mkimage -n")
 * @spl_hdr:            Boot ROM requires a 4-bytes spl header
 * @spl_size:           Spl size(include extra 4-bytes spl header)
 * @spl_rc4:            RC4 encode the SPL binary (same key as header)
 * @header_ver:         header block version
 */
struct spl_info {
        const char *imagename;
        const char *spl_hdr;
        const uint32_t spl_size;
        const bool spl_rc4;
        const uint32_t header_ver;
};

static struct spl_info spl_infos[] = {
        { "px30", "RK33", 0x2800, false, RK_HEADER_V1 },
        { "rk3036", "RK30", 0x1000, false, RK_HEADER_V1 },
        { "rk3128", "RK31", 0x1800, false, RK_HEADER_V1 },
        { "rk3188", "RK31", 0x8000 - 0x800, true, RK_HEADER_V1 },
        { "rk322x", "RK32", 0x8000 - 0x1000, false, RK_HEADER_V1 },
        { "rk3288", "RK32", 0x8000, false, RK_HEADER_V1 },
        { "rk3308", "RK33", 0x40000 - 0x1000, false, RK_HEADER_V1 },
        { "rk3328", "RK32", 0x8000 - 0x1000, false, RK_HEADER_V1 },
        { "rk3368", "RK33", 0x8000 - 0x1000, false, RK_HEADER_V1 },
        { "rk3399", "RK33", 0x30000 - 0x2000, false, RK_HEADER_V1 },
        { "rv1108", "RK11", 0x1800, false, RK_HEADER_V1 },
        { "rk3568", "RK35", 0x14000 - 0x1000, false, RK_HEADER_V2 },
};

/**
 * struct spl_params - spl params parsed in check_params()
 *
 * @init_file:          Init data file path
 * @init_size:          Aligned size of init data in bytes
 * @boot_file:          Boot data file path
 * @boot_size:          Aligned size of boot data in bytes
 */

struct spl_params {
        char *init_file;
        uint32_t init_size;
        char *boot_file;
        uint32_t boot_size;
};

static struct spl_params spl_params = { 0 };

static unsigned char rc4_key[16] = {
        124, 78, 3, 4, 85, 5, 9, 7,
        45, 44, 123, 56, 23, 13, 23, 17
};

static struct spl_info *rkcommon_get_spl_info(char *imagename)
{
        int i;

        if (!imagename)
                return NULL;

        for (i = 0; i < ARRAY_SIZE(spl_infos); i++)
                if (!strncmp(imagename, spl_infos[i].imagename, 6))
                        return spl_infos + i;

        return NULL;
}

static int rkcommon_get_aligned_size(struct image_tool_params *params,
                                     const char *fname)
{
        int size;

        size = imagetool_get_filesize(params, fname);
        if (size < 0)
                return -1;

        /*
         * Pad to a 2KB alignment, as required for init/boot size by the ROM
         * (see https://lists.denx.de/pipermail/u-boot/2017-May/293268.html)
         */
        return ROUND(size, RK_SIZE_ALIGN);
}

int rkcommon_check_params(struct image_tool_params *params)
{
        int i, size;

        /*
         * If this is a operation (list or extract), the don't require
         * imagename to be set.
         */
        if (params->lflag || params->iflag)
                return EXIT_SUCCESS;

        if (!rkcommon_get_spl_info(params->imagename))
                goto err_spl_info;

        spl_params.init_file = params->datafile;

        spl_params.boot_file = strchr(spl_params.init_file, ':');
        if (spl_params.boot_file) {
                *spl_params.boot_file = '\0';
                spl_params.boot_file += 1;
        }

        size = rkcommon_get_aligned_size(params, spl_params.init_file);
        if (size < 0)
                return EXIT_FAILURE;
        spl_params.init_size = size;

        /* Boot file is optional, and only for back-to-bootrom functionality. */
        if (spl_params.boot_file) {
                size = rkcommon_get_aligned_size(params, spl_params.boot_file);
                if (size < 0)
                        return EXIT_FAILURE;
                spl_params.boot_size = size;
        }

        if (spl_params.init_size > rkcommon_get_spl_size(params)) {
                fprintf(stderr,
                        "Error: SPL image is too large (size %#x than %#x)\n",
                        spl_params.init_size, rkcommon_get_spl_size(params));
                return EXIT_FAILURE;
        }

        return EXIT_SUCCESS;

err_spl_info:
        fprintf(stderr, "ERROR: imagename (%s) is not supported!\n",
                params->imagename ? params->imagename : "NULL");

        fprintf(stderr, "Available imagename:");
        for (i = 0; i < ARRAY_SIZE(spl_infos); i++)
                fprintf(stderr, "\t%s", spl_infos[i].imagename);
        fprintf(stderr, "\n");

        return EXIT_FAILURE;
}

const char *rkcommon_get_spl_hdr(struct image_tool_params *params)
{
        struct spl_info *info = rkcommon_get_spl_info(params->imagename);

        /*
         * info would not be NULL, because of we checked params before.
         */
        return info->spl_hdr;
}

int rkcommon_get_spl_size(struct image_tool_params *params)
{
        struct spl_info *info = rkcommon_get_spl_info(params->imagename);

        /*
         * info would not be NULL, because of we checked params before.
         */
        return info->spl_size;
}

bool rkcommon_need_rc4_spl(struct image_tool_params *params)
{
        struct spl_info *info = rkcommon_get_spl_info(params->imagename);

        /*
         * info would not be NULL, because of we checked params before.
         */
        return info->spl_rc4;
}

bool rkcommon_is_header_v2(struct image_tool_params *params)
{
        struct spl_info *info = rkcommon_get_spl_info(params->imagename);

        return (info->header_ver == RK_HEADER_V2);
}

static void do_sha256_hash(uint8_t *buf, uint32_t size, uint8_t *out)
{
        sha256_context ctx;

        sha256_starts(&ctx);
        sha256_update(&ctx, buf, size);
        sha256_finish(&ctx, out);
}

static void rkcommon_set_header0(void *buf, struct image_tool_params *params)
{
        struct header0_info *hdr = buf;
        uint32_t init_boot_size;

        memset(buf, '\0', RK_INIT_OFFSET * RK_BLK_SIZE);
        hdr->magic = cpu_to_le32(RK_MAGIC);
        hdr->disable_rc4 = cpu_to_le32(!rkcommon_need_rc4_spl(params));
        hdr->init_offset = cpu_to_le16(RK_INIT_OFFSET);
        hdr->init_size   = cpu_to_le16(spl_params.init_size / RK_BLK_SIZE);

        /*
         * init_boot_size needs to be set, as it is read by the BootROM
         * to determine the size of the next-stage bootloader (e.g. U-Boot
         * proper), when used with the back-to-bootrom functionality.
         *
         * see https://lists.denx.de/pipermail/u-boot/2017-May/293267.html
         * for a more detailed explanation by Andy Yan
         */
        if (spl_params.boot_file)
                init_boot_size = spl_params.init_size + spl_params.boot_size;
        else
                init_boot_size = spl_params.init_size + RK_MAX_BOOT_SIZE;
        hdr->init_boot_size = cpu_to_le16(init_boot_size / RK_BLK_SIZE);

        rc4_encode(buf, RK_BLK_SIZE, rc4_key);
}

static void rkcommon_set_header0_v2(void *buf, struct image_tool_params *params)
{
        struct header0_info_v2 *hdr = buf;
        uint32_t sector_offset, image_sector_count;
        uint32_t image_size_array[2];
        uint8_t *image_ptr = NULL;
        int i;

        printf("Image Type:   Rockchip %s boot image\n",
                rkcommon_get_spl_hdr(params));
        memset(buf, '\0', RK_INIT_OFFSET * RK_BLK_SIZE);
        hdr->magic   = cpu_to_le32(RK_MAGIC_V2);
        hdr->size_and_nimage = cpu_to_le32((2 << 16) + 384);
        hdr->boot_flag = cpu_to_le32(HASH_SHA256);
        sector_offset = 4;
        image_size_array[0] = spl_params.init_size;
        image_size_array[1] = spl_params.boot_size;

        for (i = 0; i < 2; i++) {
                image_sector_count = image_size_array[i] / RK_BLK_SIZE;
                hdr->images[i].size_and_off = cpu_to_le32((image_sector_count
                                                        << 16) + sector_offset);
                hdr->images[i].address = 0xFFFFFFFF;
                hdr->images[i].counter = cpu_to_le32(i + 1);
                image_ptr = buf + sector_offset * RK_BLK_SIZE;
                do_sha256_hash(image_ptr, image_size_array[i],
                               hdr->images[i].hash);
                sector_offset = sector_offset + image_sector_count;
        }

        do_sha256_hash(buf, (void *)hdr->hash - buf, hdr->hash);
}

void rkcommon_set_header(void *buf,  struct stat *sbuf,  int ifd,
                         struct image_tool_params *params)
{
        struct header1_info *hdr = buf + RK_SPL_HDR_START;

        if (rkcommon_is_header_v2(params)) {
                rkcommon_set_header0_v2(buf, params);
        } else {
                rkcommon_set_header0(buf, params);

                /* Set up the SPL name (i.e. copy spl_hdr over) */
                if (memcmp(&hdr->magic, "RSAK", 4))
                        memcpy(&hdr->magic, rkcommon_get_spl_hdr(params), RK_SPL_HDR_SIZE);

                if (rkcommon_need_rc4_spl(params))
                        rkcommon_rc4_encode_spl(buf, RK_SPL_HDR_START,
                                                spl_params.init_size);

                if (spl_params.boot_file) {
                        if (rkcommon_need_rc4_spl(params))
                                rkcommon_rc4_encode_spl(buf + RK_SPL_HDR_START,
                                                        spl_params.init_size,
                                                        spl_params.boot_size);
                }
        }
}

static inline unsigned int rkcommon_offset_to_spi(unsigned int offset)
{
        /*
         * While SD/MMC images use a flat addressing, SPI images are padded
         * to use the first 2K of every 4K sector only.
         */
        return ((offset & ~0x7ff) << 1) + (offset & 0x7ff);
}

static int rkcommon_parse_header(const void *buf, struct header0_info *header0,
                                 struct spl_info **spl_info)
{
        unsigned int hdr1_offset;
        struct header1_info *hdr1_sdmmc, *hdr1_spi;
        int i;

        if (spl_info)
                *spl_info = NULL;

        /*
         * The first header (hdr0) is always RC4 encoded, so try to decrypt
         * with the well-known key.
         */
        memcpy((void *)header0, buf, sizeof(struct header0_info));
        rc4_encode((void *)header0, sizeof(struct header0_info), rc4_key);

        if (le32_to_cpu(header0->magic) != RK_MAGIC)
                return -EPROTO;

        /* We don't support RC4 encoded image payloads here, yet... */
        if (le32_to_cpu(header0->disable_rc4) == 0)
                return -ENOSYS;

        hdr1_offset = le16_to_cpu(header0->init_offset) * RK_BLK_SIZE;
        hdr1_sdmmc = (struct header1_info *)(buf + hdr1_offset);
        hdr1_spi = (struct header1_info *)(buf +
                                           rkcommon_offset_to_spi(hdr1_offset));

        for (i = 0; i < ARRAY_SIZE(spl_infos); i++) {
                if (!memcmp(&hdr1_sdmmc->magic, spl_infos[i].spl_hdr,
                            RK_SPL_HDR_SIZE)) {
                        if (spl_info)
                                *spl_info = &spl_infos[i];
                        return IH_TYPE_RKSD;
                } else if (!memcmp(&hdr1_spi->magic, spl_infos[i].spl_hdr,
                                   RK_SPL_HDR_SIZE)) {
                        if (spl_info)
                                *spl_info = &spl_infos[i];
                        return IH_TYPE_RKSPI;
                }
        }

        return -1;
}

static int rkcommon_parse_header_v2(const void *buf, struct header0_info_v2 *header)
{
        memcpy((void *)header, buf, sizeof(struct header0_info_v2));

        if (le32_to_cpu(header->magic) != RK_MAGIC_V2)
                return -EPROTO;

        return 0;
}

int rkcommon_verify_header(unsigned char *buf, int size,
                           struct image_tool_params *params)
{
        struct header0_info header0;
        struct spl_info *img_spl_info, *spl_info;
        int ret;

        ret = rkcommon_parse_header(buf, &header0, &img_spl_info);

        /* If this is the (unimplemented) RC4 case, then rewrite the result */
        if (ret == -ENOSYS)
                return 0;

        if (ret < 0)
                return ret;

        /*
         * If no 'imagename' is specified via the commandline (e.g. if this is
         * 'dumpimage -l' w/o any further constraints), we accept any spl_info.
         */
        if (params->imagename == NULL)
                return 0;

        /* Match the 'imagename' against the 'spl_hdr' found */
        spl_info = rkcommon_get_spl_info(params->imagename);
        if (spl_info && img_spl_info)
                return strcmp(spl_info->spl_hdr, img_spl_info->spl_hdr);

        return -ENOENT;
}

void rkcommon_print_header(const void *buf)
{
        struct header0_info header0;
        struct header0_info_v2 header0_v2;
        struct spl_info *spl_info;
        uint8_t image_type;
        int ret, boot_size, init_size;

        if ((*(uint32_t *)buf) == RK_MAGIC_V2) {
                ret = rkcommon_parse_header_v2(buf, &header0_v2);

                if (ret < 0) {
                        fprintf(stderr, "Error: image verification failed\n");
                        return;
                }

                init_size = header0_v2.images[0].size_and_off >> 16;
                init_size = init_size * RK_BLK_SIZE;
                boot_size = header0_v2.images[1].size_and_off >> 16;
                boot_size = boot_size * RK_BLK_SIZE;
        } else {
                ret = rkcommon_parse_header(buf, &header0, &spl_info);

                /* If this is the (unimplemented) RC4 case, then fail silently */
                if (ret == -ENOSYS)
                        return;

                if (ret < 0) {
                        fprintf(stderr, "Error: image verification failed\n");
                        return;
                }

                image_type = ret;
                init_size = header0.init_size * RK_BLK_SIZE;
                boot_size = header0.init_boot_size * RK_BLK_SIZE - init_size;

                printf("Image Type:   Rockchip %s (%s) boot image\n",
                       spl_info->spl_hdr,
                       (image_type == IH_TYPE_RKSD) ? "SD/MMC" : "SPI");
        }

        printf("Init Data Size: %d bytes\n", init_size);

        if (boot_size != RK_MAX_BOOT_SIZE)
                printf("Boot Data Size: %d bytes\n", boot_size);
}

void rkcommon_rc4_encode_spl(void *buf, unsigned int offset, unsigned int size)
{
        unsigned int remaining = size;

        while (remaining > 0) {
                int step = (remaining > RK_BLK_SIZE) ? RK_BLK_SIZE : remaining;

                rc4_encode(buf + offset, step, rc4_key);
                offset += RK_BLK_SIZE;
                remaining -= step;
        }
}

int rkcommon_vrec_header(struct image_tool_params *params,
                         struct image_type_params *tparams)
{
        /*
         * The SPL image looks as follows:
         *
         * 0x0    header0 (see rkcommon.c)
         * 0x800  spl_name ('RK30', ..., 'RK33')
         *        (start of the payload for AArch64 payloads: we expect the
         *        first 4 bytes to be available for overwriting with our
         *        spl_name)
         * 0x804  first instruction to be executed
         *        (start of the image/payload for 32bit payloads)
         *
         * For AArch64 (ARMv8) payloads, natural alignment (8-bytes) is
         * required for its sections (so the image we receive needs to
         * have the first 4 bytes reserved for the spl_name).  Reserving
         * these 4 bytes is done using the BOOT0_HOOK infrastructure.
         *
         * The header is always at 0x800 (as we now use a payload
         * prepadded using the boot0 hook for all targets): the first
         * 4 bytes of these images can safely be overwritten using the
         * boot magic.
         */
        tparams->header_size = RK_SPL_HDR_START;

        /* Allocate, clear and install the header */
        tparams->hdr = malloc(tparams->header_size);
        if (!tparams->hdr) {
                fprintf(stderr, "%s: Can't alloc header: %s\n",
                        params->cmdname, strerror(errno));
                exit(EXIT_FAILURE);
        }
        memset(tparams->hdr, 0, tparams->header_size);

        /*
         * We need to store the original file-size (i.e. before padding), as
         * imagetool does not set this during its adjustment of file_size.
         */
        params->orig_file_size = tparams->header_size +
                spl_params.init_size + spl_params.boot_size;

        params->file_size = ROUND(params->orig_file_size, RK_SIZE_ALIGN);

        /* Ignoring pad len, since we are using our own copy_image() */
        return 0;
}

static int pad_file(struct image_tool_params *params, int ifd, int pad)
{
        uint8_t zeros[4096];

        memset(zeros, 0, sizeof(zeros));

        while (pad > 0) {
                int todo = sizeof(zeros);

                if (todo > pad)
                        todo = pad;
                if (write(ifd, (char *)&zeros, todo) != todo) {
                        fprintf(stderr, "%s: Write error on %s: %s\n",
                                params->cmdname, params->imagefile,
                                strerror(errno));
                        return -1;
                }
                pad -= todo;
        }

        return 0;
}

static int copy_file(struct image_tool_params *params, int ifd,
                     const char *file, int padded_size)
{
        int dfd;
        struct stat sbuf;
        unsigned char *ptr;
        int size;

        if (params->vflag)
                fprintf(stderr, "Adding Image %s\n", file);

        dfd = open(file, O_RDONLY | O_BINARY);
        if (dfd < 0) {
                fprintf(stderr, "%s: Can't open %s: %s\n",
                        params->cmdname, file, strerror(errno));
                return -1;
        }

        if (fstat(dfd, &sbuf) < 0) {
                fprintf(stderr, "%s: Can't stat %s: %s\n",
                        params->cmdname, file, strerror(errno));
                goto err_close;
        }

        if (params->vflag)
                fprintf(stderr, "Size %u(pad to %u)\n",
                        (int)sbuf.st_size, padded_size);

        ptr = mmap(0, sbuf.st_size, PROT_READ, MAP_SHARED, dfd, 0);
        if (ptr == MAP_FAILED) {
                fprintf(stderr, "%s: Can't read %s: %s\n",
                        params->cmdname, file, strerror(errno));
                goto err_munmap;
        }

        size = sbuf.st_size;
        if (write(ifd, ptr, size) != size) {
                fprintf(stderr, "%s: Write error on %s: %s\n",
                        params->cmdname, params->imagefile, strerror(errno));
                goto err_munmap;
        }

        munmap((void *)ptr, sbuf.st_size);
        close(dfd);
        return pad_file(params, ifd, padded_size - size);

err_munmap:
        munmap((void *)ptr, sbuf.st_size);
err_close:
        close(dfd);
        return -1;
}

int rockchip_copy_image(int ifd, struct image_tool_params *params)
{
        int ret;

        ret = copy_file(params, ifd, spl_params.init_file,
                        spl_params.init_size);
        if (ret)
                return ret;

        if (spl_params.boot_file) {
                ret = copy_file(params, ifd, spl_params.boot_file,
                                spl_params.boot_size);
                if (ret)
                        return ret;
        }

        return pad_file(params, ifd,
                        params->file_size - params->orig_file_size);
}