[people/ms/u-boot.git] / tools / rkcommon.c

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

#include "imagetool.h"
#include <image.h>
#include <rc4.h>
#include "mkimage.h"
#include "rkcommon.h"

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];
};

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

int rkcommon_set_header(void *buf, uint file_size)
{
	struct header0_info *hdr;

	if (file_size > CONFIG_ROCKCHIP_MAX_SPL_SIZE)
		return -ENOSPC;

	memset(buf,  '\0', RK_INIT_OFFSET * RK_BLK_SIZE);
	hdr = (struct header0_info *)buf;
	hdr->signature = RK_SIGNATURE;
	hdr->disable_rc4 = 1;
	hdr->init_offset = RK_INIT_OFFSET;

	hdr->init_size = (file_size + RK_BLK_SIZE - 1) / RK_BLK_SIZE;
	hdr->init_size = (hdr->init_size + 3) & ~3;
	hdr->init_boot_size = hdr->init_size + RK_MAX_BOOT_SIZE / RK_BLK_SIZE;

	rc4_encode(buf, RK_BLK_SIZE, rc4_key);

	return 0;
}
Commit	Line	Data
a131c1f4 SG	1	/*
	2	* (C) Copyright 2015 Google, Inc
	3	* Written by Simon Glass <sjg@chromium.org>
	4	*
	5	* SPDX-License-Identifier: GPL-2.0+
	6	*
	7	* Helper functions for Rockchip images
	8	*/
	9
	10	#include "imagetool.h"
	11	#include <image.h>
	12	#include <rc4.h>
	13	#include "mkimage.h"
	14	#include "rkcommon.h"
	15
	16	enum {
	17	RK_SIGNATURE = 0x0ff0aa55,
	18	};
	19
	20	/**
	21	* struct header0_info - header block for boot ROM
	22	*
	23	* This is stored at SD card block 64 (where each block is 512 bytes, or at
	24	* the start of SPI flash. It is encoded with RC4.
	25	*
	26	* @signature: Signature (must be RKSD_SIGNATURE)
	27	* @disable_rc4: 0 to use rc4 for boot image, 1 to use plain binary
3641339e	28	* @init_offset: Offset in blocks of the SPL code from this header
a131c1f4 SG	29	* block. E.g. 4 means 2KB after the start of this header.
	30	* Other fields are not used by U-Boot
	31	*/
	32	struct header0_info {
	33	uint32_t signature;
	34	uint8_t reserved[4];
	35	uint32_t disable_rc4;
3641339e JC	36	uint16_t init_offset;
	37	uint8_t reserved1[492];
	38	uint16_t init_size;
	39	uint16_t init_boot_size;
a131c1f4 SG	40	uint8_t reserved2[2];
	41	};
	42
	43	static unsigned char rc4_key[16] = {
	44	124, 78, 3, 4, 85, 5, 9, 7,
	45	45, 44, 123, 56, 23, 13, 23, 17
	46	};
	47
	48	int rkcommon_set_header(void *buf, uint file_size)
	49	{
	50	struct header0_info *hdr;
	51
6ae58609	52	if (file_size > CONFIG_ROCKCHIP_MAX_SPL_SIZE)
a131c1f4 SG	53	return -ENOSPC;
a131c1f4 SG	54
3641339e	55	memset(buf, '\0', RK_INIT_OFFSET * RK_BLK_SIZE);
a131c1f4 SG	56	hdr = (struct header0_info *)buf;
	57	hdr->signature = RK_SIGNATURE;
	58	hdr->disable_rc4 = 1;
3641339e	59	hdr->init_offset = RK_INIT_OFFSET;
a131c1f4	60
3641339e JC	61	hdr->init_size = (file_size + RK_BLK_SIZE - 1) / RK_BLK_SIZE;
	62	hdr->init_size = (hdr->init_size + 3) & ~3;
	63	hdr->init_boot_size = hdr->init_size + RK_MAX_BOOT_SIZE / RK_BLK_SIZE;
a131c1f4 SG	64
	65	rc4_encode(buf, RK_BLK_SIZE, rc4_key);
	66
	67	return 0;
	68	}