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// 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 <rc4.h>
#include "mkimage.h"
#include "rkcommon.h"
#define DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
enum {
RK_SIGNATURE = 0x0ff0aa55,
};
/**
* 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.
*
* @signature: Signature (must be RKSD_SIGNATURE)
* @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 signature;
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)
*/
struct spl_info {
const char *imagename;
const char *spl_hdr;
const uint32_t spl_size;
const bool spl_rc4;
};
static struct spl_info spl_infos[] = {
{ "rk3036", "RK30", 0x1000, false },
{ "rk3128", "RK31", 0x1800, false },
{ "rk3188", "RK31", 0x8000 - 0x800, true },
{ "rk322x", "RK32", 0x8000 - 0x1000, false },
{ "rk3288", "RK32", 0x8000, false },
{ "rk3328", "RK32", 0x8000 - 0x1000, false },
{ "rk3368", "RK33", 0x8000 - 0x1000, false },
{ "rk3399", "RK33", 0x30000 - 0x2000, false },
{ "rv1108", "RK11", 0x1800, false },
};
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;
}
int rkcommon_check_params(struct image_tool_params *params)
{
int i;
if (rkcommon_get_spl_info(params->imagename) != NULL)
return EXIT_SUCCESS;
/*
* If this is a operation (list or extract), the don't require
* imagename to be set.
*/
if (params->lflag || params->iflag)
return EXIT_SUCCESS;
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;
}
static void rkcommon_set_header0(void *buf, uint file_size,
struct image_tool_params *params)
{
struct header0_info *hdr = buf;
memset(buf, '\0', RK_INIT_OFFSET * RK_BLK_SIZE);
hdr->signature = RK_SIGNATURE;
hdr->disable_rc4 = !rkcommon_need_rc4_spl(params);
hdr->init_offset = RK_INIT_OFFSET;
hdr->init_size = DIV_ROUND_UP(file_size, RK_BLK_SIZE);
/*
* The init_size has to be a multiple of 4 blocks (i.e. of 2K)
* or the BootROM will not boot the image.
*
* Note: To verify that this is not a legacy constraint, we
* rechecked this against the RK3399 BootROM.
*/
hdr->init_size = ROUND(hdr->init_size, 4);
/*
* 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
*/
hdr->init_boot_size = hdr->init_size + RK_MAX_BOOT_SIZE / RK_BLK_SIZE;
rc4_encode(buf, RK_BLK_SIZE, rc4_key);
}
int rkcommon_set_header(void *buf, uint file_size,
struct image_tool_params *params)
{
struct header1_info *hdr = buf + RK_SPL_HDR_START;
if (file_size > rkcommon_get_spl_size(params))
return -ENOSPC;
rkcommon_set_header0(buf, file_size, params);
/* Set up the SPL name (i.e. copy spl_hdr over) */
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,
params->file_size - RK_SPL_HDR_START);
return 0;
}
static inline unsigned rkcommon_offset_to_spi(unsigned 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 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 (header0->signature != RK_SIGNATURE)
return -EPROTO;
/* We don't support RC4 encoded image payloads here, yet... */
if (header0->disable_rc4 == 0)
return -ENOSYS;
hdr1_offset = 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, 4)) {
if (spl_info)
*spl_info = &spl_infos[i];
return IH_TYPE_RKSD;
} else if (!memcmp(&hdr1_spi->magic, spl_infos[i].spl_hdr, 4)) {
if (spl_info)
*spl_info = &spl_infos[i];
return IH_TYPE_RKSPI;
}
}
return -1;
}
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 spl_info *spl_info;
uint8_t image_type;
int ret;
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;
printf("Image Type: Rockchip %s (%s) boot image\n",
spl_info->spl_hdr,
(image_type == IH_TYPE_RKSD) ? "SD/MMC" : "SPI");
printf("Data Size: %d bytes\n", header0.init_size * RK_BLK_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,
unsigned int alignment)
{
unsigned int unpadded_size;
unsigned int padded_size;
/*
* 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)
return -ENOMEM;
memset(tparams->hdr, 0, tparams->header_size);
/*
* If someone passed in 0 for the alignment, we'd better handle
* it correctly...
*/
if (!alignment)
alignment = 1;
unpadded_size = tparams->header_size + params->file_size;
padded_size = ROUND(unpadded_size, alignment);
return padded_size - unpadded_size;
}