mtk-lk/platform/common/boot/boot_opt.c

/* Copyright Statement:
 *
 * This software/firmware and related documentation ("MediaTek Software") are
 * protected under relevant copyright laws. The information contained herein
 * is confidential and proprietary to MediaTek Inc. and/or its licensors.
 * Without the prior written permission of MediaTek inc. and/or its licensors,
 * any reproduction, modification, use or disclosure of MediaTek Software,
 * and information contained herein, in whole or in part, shall be strictly prohibited.
 */
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 *
 * BY OPENING THIS FILE, RECEIVER HEREBY UNEQUIVOCALLY ACKNOWLEDGES AND AGREES
 * THAT THE SOFTWARE/FIRMWARE AND ITS DOCUMENTATIONS ("MEDIATEK SOFTWARE")
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 */

#include <string.h>

#include <pal_typedefs.h>
#include <pal_log.h>

#include <load_vfy_boot.h>
#include <bootimg.h>
#include <boot_opt.h>

#include <platform/boot_mode.h>

#define KERNEL_64_BIT "64"
#define KERNEL_32_BIT "32"
#define KERNEL_BIT_OFF (0x12)
#define BOOTOPT "bootopt="

int g_is_64bit_kernel = 0;

/* search "bootopt" string */
static int32_t get_bootopt_off(uint8_t *cmdline)
{
	int32_t i = 0;
	int32_t i_end = BOOTIMG_ARGS_SZ - 0x16;

	for (i = 0; i < i_end; i++) {
		const char *boot_opt = (const char *)&cmdline[i];
		if (0 == strncmp(boot_opt, BOOTOPT, strlen(BOOTOPT)))
			break;
	}

	if (i == i_end)
		i = -1;

	return i;
}

void platform_parse_bootopt(uint8_t *cmdline)
{
	int32_t i = 0;
	const char *kernel_bit;

	i = get_bootopt_off(cmdline);
	if (i == -1) {
		pal_log_err("Warning! No bootopt info!\n");
		return;
	}

	kernel_bit = (const char *)&cmdline[i + KERNEL_BIT_OFF];
	if (0 == strncmp(kernel_bit, KERNEL_64_BIT, strlen(KERNEL_64_BIT)))
		g_is_64bit_kernel = 1;
	else if (0 == strncmp(kernel_bit, KERNEL_32_BIT, strlen(KERNEL_32_BIT)))
		g_is_64bit_kernel = 0;

	/* no error handling when kernel bit string is not found */

	return;
}