hekate/bootloader/hos/hos.c

/*
 * Copyright (c) 2018 naehrwert
 * Copyright (c) 2018 st4rk
 * Copyright (c) 2018 Ced2911
 * Copyright (c) 2018-2020 CTCaer
 * Copyright (c) 2018 balika011
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <string.h>

#include "hos.h"
#include "hos_config.h"
#include "sept.h"
#include "secmon_exo.h"
#include "../config.h"
#include <gfx/di.h>
#include <gfx_utils.h>
#include <mem/heap.h>
#include <mem/mc.h>
#include <mem/minerva.h>
#include <mem/smmu.h>
#include <sec/se.h>
#include <sec/se_t210.h>
#include <sec/tsec.h>
#include <soc/bpmp.h>
#include <soc/ccplex.h>
#include <soc/clock.h>
#include <soc/fuse.h>
#include <soc/pmc.h>
#include <soc/t210.h>
#include "../storage/emummc.h"
#include <storage/mbr_gpt.h>
#include "../storage/nx_emmc.h"
#include <storage/nx_sd.h>
#include <storage/sdmmc.h>
#include <utils/btn.h>
#include <utils/util.h>

extern hekate_config h_cfg;

//#define DPRINTF(...) gfx_printf(__VA_ARGS__)
#define DPRINTF(...)

#define EHPRINTFARGS(text, args...) \
	({  gfx_con.mute = false; \
		gfx_printf("%k"text"%k\n", 0xFFFF0000, args, 0xFFCCCCCC); })

#define PKG2_LOAD_ADDR 0xA9800000

#define SECMON_BCT_CFG_ADDR  0x4003D000
#define SECMON6_BCT_CFG_ADDR 0x4003F800

 // Secmon mailbox.
#define SECMON_MAILBOX_ADDR  0x40002E00
#define SECMON7_MAILBOX_ADDR 0x40000000
#define  SECMON_STATE_OFFSET 0xF8
typedef struct _secmon_mailbox_t
{
	//  < 4.0.0 Signals - 0: Not ready, 1: BCT ready, 2: DRAM and pkg2 ready, 3: Continue boot.
	// >= 4.0.0 Signals - 0: Not ready, 1: BCT ready, 2: DRAM ready, 4: pkg2 ready and continue boot.
	u32 in;
	// Non-zero: Secmon ready.
	u32 out;
} secmon_mailbox_t;

static const u8 keyblob_keyseeds[][0x10] = {
	{ 0xDF, 0x20, 0x6F, 0x59, 0x44, 0x54, 0xEF, 0xDC, 0x70, 0x74, 0x48, 0x3B, 0x0D, 0xED, 0x9F, 0xD3 }, // 1.0.0.
	{ 0x0C, 0x25, 0x61, 0x5D, 0x68, 0x4C, 0xEB, 0x42, 0x1C, 0x23, 0x79, 0xEA, 0x82, 0x25, 0x12, 0xAC }, // 3.0.0.
	{ 0x33, 0x76, 0x85, 0xEE, 0x88, 0x4A, 0xAE, 0x0A, 0xC2, 0x8A, 0xFD, 0x7D, 0x63, 0xC0, 0x43, 0x3B }, // 3.0.1.
	{ 0x2D, 0x1F, 0x48, 0x80, 0xED, 0xEC, 0xED, 0x3E, 0x3C, 0xF2, 0x48, 0xB5, 0x65, 0x7D, 0xF7, 0xBE }, // 4.0.0.
	{ 0xBB, 0x5A, 0x01, 0xF9, 0x88, 0xAF, 0xF5, 0xFC, 0x6C, 0xFF, 0x07, 0x9E, 0x13, 0x3C, 0x39, 0x80 }, // 5.0.0.
	{ 0xD8, 0xCC, 0xE1, 0x26, 0x6A, 0x35, 0x3F, 0xCC, 0x20, 0xF3, 0x2D, 0x3B, 0x51, 0x7D, 0xE9, 0xC0 }  // 6.0.0.
};

static const u8 cmac_keyseed[0x10] =
	{ 0x59, 0xC7, 0xFB, 0x6F, 0xBE, 0x9B, 0xBE, 0x87, 0x65, 0x6B, 0x15, 0xC0, 0x53, 0x73, 0x36, 0xA5 };

static const u8 master_keyseed_retail[0x10] =
	{ 0xD8, 0xA2, 0x41, 0x0A, 0xC6, 0xC5, 0x90, 0x01, 0xC6, 0x1D, 0x6A, 0x26, 0x7C, 0x51, 0x3F, 0x3C };

static const u8 master_keyseed_4xx_5xx_610[0x10] =
	{ 0x2D, 0xC1, 0xF4, 0x8D, 0xF3, 0x5B, 0x69, 0x33, 0x42, 0x10, 0xAC, 0x65, 0xDA, 0x90, 0x46, 0x66 };

static const u8 master_keyseed_620[0x10] =
	{ 0x37, 0x4B, 0x77, 0x29, 0x59, 0xB4, 0x04, 0x30, 0x81, 0xF6, 0xE5, 0x8C, 0x6D, 0x36, 0x17, 0x9A };

static const u8 master_kekseed_t210b01[][0x10] = {
	{ 0x77, 0x60, 0x5A, 0xD2, 0xEE, 0x6E, 0xF8, 0x3C, 0x3F, 0x72, 0xE2, 0x59, 0x9D, 0xAC, 0x5E, 0x56 }, // 6.0.0.
	{ 0x1E, 0x80, 0xB8, 0x17, 0x3E, 0xC0, 0x60, 0xAA, 0x11, 0xBE, 0x1A, 0x4A, 0xA6, 0x6F, 0xE4, 0xAE }, // 6.2.0.
	{ 0x94, 0x08, 0x67, 0xBD, 0x0A, 0x00, 0x38, 0x84, 0x11, 0xD3, 0x1A, 0xDB, 0xDD, 0x8D, 0xF1, 0x8A }, // 7.0.0.
	{ 0x5C, 0x24, 0xE3, 0xB8, 0xB4, 0xF7, 0x00, 0xC2, 0x3C, 0xFD, 0x0A, 0xCE, 0x13, 0xC3, 0xDC, 0x23 }, // 8.1.0.
	{ 0x86, 0x69, 0xF0, 0x09, 0x87, 0xC8, 0x05, 0xAE, 0xB5, 0x7B, 0x48, 0x74, 0xDE, 0x62, 0xA6, 0x13 }, // 9.0.0.
	{ 0x0E, 0x44, 0x0C, 0xED, 0xB4, 0x36, 0xC0, 0x3F, 0xAA, 0x1D, 0xAE, 0xBF, 0x62, 0xB1, 0x09, 0x82 }, // 9.1.0.
};

static const u8 console_keyseed[0x10] =
	{ 0x4F, 0x02, 0x5F, 0x0E, 0xB6, 0x6D, 0x11, 0x0E, 0xDC, 0x32, 0x7D, 0x41, 0x86, 0xC2, 0xF4, 0x78 };

static const u8 console_keyseed_4xx_5xx[0x10] =
	{ 0x0C, 0x91, 0x09, 0xDB, 0x93, 0x93, 0x07, 0x81, 0x07, 0x3C, 0xC4, 0x16, 0x22, 0x7C, 0x6C, 0x28 };

const u8 package2_keyseed[0x10] =
	{ 0xFB, 0x8B, 0x6A, 0x9C, 0x79, 0x00, 0xC8, 0x49, 0xEF, 0xD2, 0x4D, 0x85, 0x4D, 0x30, 0xA0, 0xC7 };

static void _hos_crit_error(const char *text)
{
	gfx_con.mute = false;
	gfx_printf("%k%s%k\n", 0xFFFF0000, text, 0xFFCCCCCC);
}

static void _se_lock(bool lock_se)
{
	if (lock_se)
	{
		for (u32 i = 0; i < 16; i++)
			se_key_acc_ctrl(i, SE_KEY_TBL_DIS_KEYREAD_FLAG | SE_KEY_TBL_DIS_OIVREAD_FLAG | SE_KEY_TBL_DIS_UIVREAD_FLAG);

		for (u32 i = 0; i < 2; i++)
			se_rsa_acc_ctrl(i, SE_RSA_KEY_TBL_DIS_KEYREAD_FLAG);
		SE(SE_TZRAM_SECURITY_0) = 0; // Make SE TZRAM secure only.
		SE(SE_KEY_TABLE_ACCESS_LOCK_OFFSET) = 0; // Make all key access regs secure only.
		SE(SE_RSA_KEYTABLE_ACCESS_LOCK_OFFSET) = 0; // Make all RSA access regs secure only.
		SE(SE_SECURITY_0) &= 0xFFFFFFFB; // Make access lock regs secure only.
	}

	memset((void *)IPATCH_BASE, 0, 14 * sizeof(u32));
	SB(SB_CSR) = SB_CSR_PIROM_DISABLE;

	// This is useful for documenting the bits in the SE config registers, so we can keep it around.
	/*gfx_printf("SE(SE_SECURITY_0) = %08X\n", SE(SE_SECURITY_0));
	gfx_printf("SE(0x4) = %08X\n", SE(0x4));
	gfx_printf("SE(SE_KEY_TABLE_ACCESS_LOCK_OFFSET) = %08X\n", SE(SE_KEY_TABLE_ACCESS_LOCK_OFFSET));
	gfx_printf("SE(SE_RSA_KEYTABLE_ACCESS_LOCK_OFFSET) = %08X\n", SE(SE_RSA_KEYTABLE_ACCESS_LOCK_OFFSET));
	for(u32 i = 0; i < 16; i++)
		gfx_printf("%02X ", SE(SE_KEY_TABLE_ACCESS_REG_OFFSET + i * 4) & 0xFF);
	gfx_putc('\n');
	for(u32 i = 0; i < 2; i++)
		gfx_printf("%02X ", SE(SE_RSA_KEYTABLE_ACCESS_REG_OFFSET + i * 4) & 0xFF);
	gfx_putc('\n');
	gfx_hexdump(SE_BASE, (void *)SE_BASE, 0x400);*/
}

void _pmc_scratch_lock(u32 kb)
{
	switch (kb)
	{
	case KB_FIRMWARE_VERSION_100_200:
	case KB_FIRMWARE_VERSION_300:
	case KB_FIRMWARE_VERSION_301:
		PMC(APBDEV_PMC_SEC_DISABLE)  = 0x7FFFF3;
		PMC(APBDEV_PMC_SEC_DISABLE2) = 0xFFFFFFFF;
		PMC(APBDEV_PMC_SEC_DISABLE3) = 0xFFAFFFFF;
		PMC(APBDEV_PMC_SEC_DISABLE4) = 0xFFFFFFFF;
		PMC(APBDEV_PMC_SEC_DISABLE5) = 0xFFFFFFFF;
		PMC(APBDEV_PMC_SEC_DISABLE6) = 0xFFFFFFFF;
		PMC(APBDEV_PMC_SEC_DISABLE7) = 0xFFFFFFFF;
		PMC(APBDEV_PMC_SEC_DISABLE8) = 0xFFAAFFFF;
		break;
	default:
		PMC(APBDEV_PMC_SEC_DISABLE2) |= 0x3FCFFFF;
	    PMC(APBDEV_PMC_SEC_DISABLE4) |= 0x3F3FFFFF;
	    PMC(APBDEV_PMC_SEC_DISABLE5)  = 0xFFFFFFFF;
	    PMC(APBDEV_PMC_SEC_DISABLE6) |= 0xF3FFC00F;
	    PMC(APBDEV_PMC_SEC_DISABLE7) |= 0x3FFFFF;
	    PMC(APBDEV_PMC_SEC_DISABLE8) |= 0xFF;
		break;
	}
}

void _sysctr0_reset()
{
	SYSCTR0(SYSCTR0_CNTCR) = 0;
	SYSCTR0(SYSCTR0_COUNTERID0) = 0;
	SYSCTR0(SYSCTR0_COUNTERID1) = 0;
	SYSCTR0(SYSCTR0_COUNTERID2) = 0;
	SYSCTR0(SYSCTR0_COUNTERID3) = 0;
	SYSCTR0(SYSCTR0_COUNTERID4) = 0;
	SYSCTR0(SYSCTR0_COUNTERID5) = 0;
	SYSCTR0(SYSCTR0_COUNTERID6) = 0;
	SYSCTR0(SYSCTR0_COUNTERID7) = 0;
	SYSCTR0(SYSCTR0_COUNTERID8) = 0;
	SYSCTR0(SYSCTR0_COUNTERID9) = 0;
	SYSCTR0(SYSCTR0_COUNTERID10) = 0;
	SYSCTR0(SYSCTR0_COUNTERID11) = 0;
}

bool hos_eks_rw_try(u8 *buf, bool write)
{
	for (u32 i = 0; i < 3; i++)
	{
		if (!write)
		{
			if (sdmmc_storage_read(&sd_storage, 0, 1, buf))
				return true;
		}
		else
		{
			if (sdmmc_storage_write(&sd_storage, 0, 1, buf))
				return true;
		}
	}

	return false;
}

void hos_eks_get()
{
	// Check if Erista based unit.
	if (h_cfg.t210b01)
		return;

	// Check if EKS already found and parsed.
	if (!h_cfg.eks)
	{
		// Read EKS blob.
		u8 *mbr = calloc(512 , 1);
		if (!hos_eks_rw_try(mbr, false))
			goto out;

		// Decrypt EKS blob.
		hos_eks_mbr_t *eks = (hos_eks_mbr_t *)(mbr + 0x80);
		se_aes_crypt_ecb(14, 0, eks, sizeof(hos_eks_mbr_t), eks, sizeof(hos_eks_mbr_t));

		// Check if valid and for this unit.
		if (eks->magic == HOS_EKS_MAGIC &&
			eks->lot0 == FUSE(FUSE_OPT_LOT_CODE_0))
		{
			h_cfg.eks = eks;
			return;
		}

out:
		free(mbr);
	}
}

void hos_eks_save(u32 kb)
{
	// Check if Erista based unit.
	if (h_cfg.t210b01)
		return;

	if (kb >= KB_FIRMWARE_VERSION_700)
	{
		u32 key_idx = 0;
		if (kb >= KB_FIRMWARE_VERSION_810)
			key_idx = 1;

		bool new_eks = false;
		if (!h_cfg.eks)
		{
			h_cfg.eks = calloc(512 , 1);
			new_eks = true;
		}

		// If matching blob doesn't exist, create it.
		bool update_eks = key_idx ? (h_cfg.eks->enabled[key_idx] < kb) : !h_cfg.eks->enabled[0];
		if (update_eks)
		{
			// Read EKS blob.
			u8 *mbr = calloc(512 , 1);
			if (!hos_eks_rw_try(mbr, false))
			{
				if (new_eks)
				{
					free(h_cfg.eks);
					h_cfg.eks = NULL;
				}

				goto out;
			}

			// Get keys.
			u8 *keys = (u8 *)calloc(0x1000, 1);
			se_get_aes_keys(keys + 0x800, keys, 0x10);

			// Set SBK back.
			if (FUSE(FUSE_PRIVATE_KEY0) == 0xFFFFFFFF)
				se_aes_key_set(14, keys + 14 * 0x10, 0x10);

			// Set magic and personalized info.
			h_cfg.eks->magic = HOS_EKS_MAGIC;
			h_cfg.eks->enabled[key_idx] = kb;
			h_cfg.eks->lot0 = FUSE(FUSE_OPT_LOT_CODE_0);

			// Copy new keys.
			memcpy(h_cfg.eks->dkg, keys + 10 * 0x10, 0x10);
			memcpy(h_cfg.eks->dkk, keys + 15 * 0x10, 0x10);

			if (!h_cfg.aes_slots_new)
			{
				memcpy(h_cfg.eks->keys[key_idx].mkk, keys + 12 * 0x10, 0x10);
				memcpy(h_cfg.eks->keys[key_idx].fdk, keys + 13 * 0x10, 0x10);
			}
			else // New sept slots.
			{
				memcpy(h_cfg.eks->keys[key_idx].mkk, keys + 13 * 0x10, 0x10);
				memcpy(h_cfg.eks->keys[key_idx].fdk, keys + 12 * 0x10, 0x10);
			}

			// Encrypt EKS blob.
			u8 *eks = calloc(512 , 1);
			memcpy(eks, h_cfg.eks, sizeof(hos_eks_mbr_t));
			se_aes_crypt_ecb(14, 1, eks, sizeof(hos_eks_mbr_t), eks, sizeof(hos_eks_mbr_t));

			// Write EKS blob to SD.
			memcpy(mbr + 0x80, eks, sizeof(hos_eks_mbr_t));
			hos_eks_rw_try(mbr, true);


			free(eks);
			free(keys);
out:
			free(mbr);
		}
	}
}

void hos_eks_clear(u32 kb)
{
	// Check if Erista based unit.
	if (h_cfg.t210b01)
		return;

	if (h_cfg.eks && kb >= KB_FIRMWARE_VERSION_700)
	{
		u32 key_idx = 0;
		if (kb >= KB_FIRMWARE_VERSION_810)
			key_idx = 1;

		// Check if Current Master key is enabled.
		if (h_cfg.eks->enabled[key_idx])
		{
			// Read EKS blob.
			u8 *mbr = calloc(512 , 1);
			if (!hos_eks_rw_try(mbr, false))
				goto out;

			// Disable current Master key version.
			h_cfg.eks->enabled[key_idx] = 0;

			// Encrypt EKS blob.
			u8 *eks = calloc(512 , 1);
			memcpy(eks, h_cfg.eks, sizeof(hos_eks_mbr_t));
			se_aes_crypt_ecb(14, 1, eks, sizeof(hos_eks_mbr_t), eks, sizeof(hos_eks_mbr_t));

			// Write EKS blob to SD.
			memcpy(mbr + 0x80, eks, sizeof(hos_eks_mbr_t));
			hos_eks_rw_try(mbr, true);

			EMC(EMC_SCRATCH0) &= ~EMC_SEPT_RUN;
			h_cfg.sept_run = false;

			free(eks);
out:
			free(mbr);
		}
	}
}

int hos_keygen_t210b01(u32 kb)
{
	// Use SBK as Device key 4x unsealer and KEK for mkey in T210B01 units.
	se_aes_unwrap_key(10, 14, console_keyseed_4xx_5xx);

	// Derive master key.
	se_aes_unwrap_key(7, 12, &master_kekseed_t210b01[kb - KB_FIRMWARE_VERSION_600]);
	se_aes_unwrap_key(7, 7, master_keyseed_retail);

	// Derive latest pkg2 key.
	se_aes_unwrap_key(8, 7, package2_keyseed);

	return 1;
}

int hos_keygen(u8 *keyblob, u32 kb, tsec_ctxt_t *tsec_ctxt, launch_ctxt_t *hos_ctxt)
{
	u8 tmp[0x30];
	u32 retries = 0;

	if (kb > KB_FIRMWARE_VERSION_MAX)
		return 0;

	if (h_cfg.t210b01)
		return hos_keygen_t210b01(kb);

	if (kb <= KB_FIRMWARE_VERSION_600)
		tsec_ctxt->size = 0xF00;
	else if (kb == KB_FIRMWARE_VERSION_620)
		tsec_ctxt->size = 0x2900;
	else if (kb == KB_FIRMWARE_VERSION_700)
		tsec_ctxt->size = 0x3000;
	else
		tsec_ctxt->size = 0x3300;

	// Prepare smmu tsec page for 6.2.0.
	if (kb == KB_FIRMWARE_VERSION_620)
	{
		u8 *tsec_paged = (u8 *)page_alloc(3);
		memcpy(tsec_paged, (void *)tsec_ctxt->fw, tsec_ctxt->size);
		tsec_ctxt->fw = tsec_paged;
	}

	// Get TSEC key.
	if (kb <= KB_FIRMWARE_VERSION_620)
	{
		while (tsec_query(tmp, kb, tsec_ctxt) < 0)
		{
			memset(tmp, 0x00, 0x20);
			retries++;

			// We rely on racing conditions, make sure we cover even the unluckiest cases.
			if (retries > 15)
			{
				_hos_crit_error("\nFailed to get TSEC keys. Please try again.");
				return 0;
			}
		}
	}

	if (kb >= KB_FIRMWARE_VERSION_700)
	{
		// Use HOS EKS if it exists.
		u32 key_idx = 0;
		if (kb >= KB_FIRMWARE_VERSION_810)
			key_idx = 1;

		if (h_cfg.eks && h_cfg.eks->enabled[key_idx] >= kb)
		{
			// Set Device keygen key to slot 10.
			se_aes_key_set(10, h_cfg.eks->dkg, 0x10);
			// Set Device key to slot 15.
			se_aes_key_set(15, h_cfg.eks->dkk, 0x10);

			if (!h_cfg.aes_slots_new)
			{
				// Set Master key to slot 12.
				se_aes_key_set(12, h_cfg.eks->keys[key_idx].mkk, 0x10);
				// Set FW Device key key to slot 13.
				se_aes_key_set(13, h_cfg.eks->keys[key_idx].fdk, 0x10);
				// Lock FDK.
				se_key_acc_ctrl(13, SE_KEY_TBL_DIS_KEYREAD_FLAG | SE_KEY_TBL_DIS_OIVREAD_FLAG | SE_KEY_TBL_DIS_UIVREAD_FLAG);
			}
			else // New exosphere.
			{
				// Set Master key to slot 13.
				se_aes_key_set(13, h_cfg.eks->keys[key_idx].mkk, 0x10);
				// Set FW Device key key to slot 12.
				se_aes_key_set(12, h_cfg.eks->keys[key_idx].fdk, 0x10);
				// Lock FDK.
				se_key_acc_ctrl(12, SE_KEY_TBL_DIS_KEYREAD_FLAG | SE_KEY_TBL_DIS_OIVREAD_FLAG | SE_KEY_TBL_DIS_UIVREAD_FLAG);
			}
		}

		se_aes_key_clear(8);
		se_aes_unwrap_key(8, !h_cfg.aes_slots_new ? 12 : 13, package2_keyseed);
	}
	else if (kb == KB_FIRMWARE_VERSION_620)
	{
		// Set TSEC key.
		se_aes_key_set(12, tmp, 0x10);
		// Set TSEC root key.
		se_aes_key_set(13, tmp + 0x10, 0x10);

		if (!(emu_cfg.enabled && !h_cfg.emummc_force_disable) && hos_ctxt->stock)
		{
			// Package2 key.
			se_aes_key_set(8, tmp + 0x10, 0x10);
			se_aes_unwrap_key(8, 8, master_keyseed_620);
			se_aes_unwrap_key(8, 8, master_keyseed_retail);
			se_aes_unwrap_key(8, 8, package2_keyseed);
		}
		else
		{
			// Decrypt keyblob and set keyslots
			se_aes_crypt_block_ecb(12, 0, tmp + 0x20, keyblob_keyseeds[0]);
			se_aes_unwrap_key(15, 14, tmp + 0x20);
			se_aes_unwrap_key(10, 15, console_keyseed_4xx_5xx);
			se_aes_unwrap_key(15, 15, console_keyseed);

			se_aes_unwrap_key(13, 13, master_keyseed_620);

			if (!h_cfg.aes_slots_new)
			{
				se_aes_unwrap_key(14, 13, master_keyseed_4xx_5xx_610);
				se_aes_unwrap_key(12, 13, master_keyseed_retail);
			}
			else // New exosphere.
			{
				se_aes_unwrap_key(12, 13, master_keyseed_4xx_5xx_610);
				se_aes_unwrap_key(13, 13, master_keyseed_retail);
			}

			// Package2 key.
			se_aes_unwrap_key(8, !h_cfg.aes_slots_new ? 12 : 13, package2_keyseed);

			h_cfg.se_keygen_done = 1;
		}
	}
	else
	{
		se_key_acc_ctrl(13, SE_KEY_TBL_DIS_KEYREAD_FLAG | SE_KEY_TBL_DIS_OIVREAD_FLAG | SE_KEY_TBL_DIS_UIVREAD_FLAG);
		se_key_acc_ctrl(14, SE_KEY_TBL_DIS_KEYREAD_FLAG | SE_KEY_TBL_DIS_OIVREAD_FLAG | SE_KEY_TBL_DIS_UIVREAD_FLAG);

		// Set TSEC key.
		se_aes_key_set(13, tmp, 0x10);

		// Derive keyblob keys from TSEC+SBK.
		se_aes_crypt_block_ecb(13, 0, tmp, keyblob_keyseeds[0]);
		se_aes_unwrap_key(15, 14, tmp);
		se_aes_crypt_block_ecb(13, 0, tmp, keyblob_keyseeds[kb]);
		se_aes_unwrap_key(13, 14, tmp);

		// Clear SBK.
		se_aes_key_clear(14);

		//TODO: verify keyblob CMAC.
		//se_aes_unwrap_key(11, 13, cmac_keyseed);
		//se_aes_cmac(tmp, 0x10, 11, keyblob + 0x10, 0xA0);
		//if (!memcmp(keyblob, tmp, 0x10))
		//	return 0;

		se_aes_crypt_block_ecb(13, 0, tmp, cmac_keyseed);
		se_aes_unwrap_key(11, 13, cmac_keyseed);

		// Decrypt keyblob and set keyslots.
		se_aes_crypt_ctr(13, keyblob + 0x20, 0x90, keyblob + 0x20, 0x90, keyblob + 0x10);
		se_aes_key_set(11, keyblob + 0x20 + 0x80, 0x10); // Package1 key.
		se_aes_key_set(12, keyblob + 0x20, 0x10);
		se_aes_key_set(13, keyblob + 0x20, 0x10);

		se_aes_crypt_block_ecb(12, 0, tmp, master_keyseed_retail);

		if (!h_cfg.aes_slots_new)
		{
			switch (kb)
			{
			case KB_FIRMWARE_VERSION_100_200:
			case KB_FIRMWARE_VERSION_300:
			case KB_FIRMWARE_VERSION_301:
				se_aes_unwrap_key(13, 15, console_keyseed);
				se_aes_unwrap_key(12, 12, master_keyseed_retail);
				break;
			case KB_FIRMWARE_VERSION_400:
				se_aes_unwrap_key(13, 15, console_keyseed_4xx_5xx);
				se_aes_unwrap_key(15, 15, console_keyseed);
				se_aes_unwrap_key(14, 12, master_keyseed_4xx_5xx_610);
				se_aes_unwrap_key(12, 12, master_keyseed_retail);
				break;
			case KB_FIRMWARE_VERSION_500:
			case KB_FIRMWARE_VERSION_600:
				se_aes_unwrap_key(10, 15, console_keyseed_4xx_5xx);
				se_aes_unwrap_key(15, 15, console_keyseed);
				se_aes_unwrap_key(14, 12, master_keyseed_4xx_5xx_610);
				se_aes_unwrap_key(12, 12, master_keyseed_retail);
				break;
			}
		}
		else // New exosphere.
		{
			se_aes_unwrap_key(10, 15, console_keyseed_4xx_5xx);
			se_aes_unwrap_key(15, 15, console_keyseed);
			se_aes_unwrap_key(13, 12, master_keyseed_retail);
			se_aes_unwrap_key(12, 12, master_keyseed_4xx_5xx_610);
		}

		// Package2 key.
		se_key_acc_ctrl(8, SE_KEY_TBL_DIS_KEYREAD_FLAG | SE_KEY_TBL_DIS_OIVREAD_FLAG | SE_KEY_TBL_DIS_UIVREAD_FLAG);
		se_aes_unwrap_key(8, !h_cfg.aes_slots_new ? 12 : 13, package2_keyseed);
	}

	return 1;
}

static int _read_emmc_pkg1(launch_ctxt_t *ctxt)
{
	static const u32 BOOTLOADER_SIZE          = 0x40000;
	static const u32 BOOTLOADER_MAIN_OFFSET   = 0x100000;
	static const u32 BOOTLOADER_BACKUP_OFFSET = 0x140000;
	static const u32 HOS_KEYBLOBS_OFFSET      = 0x180000;

	u32 pk1_offset = h_cfg.t210b01 ? sizeof(bl_hdr_t210b01_t) : 0; // Skip T210B01 OEM header.
	u32 bootloader_offset = BOOTLOADER_MAIN_OFFSET;
	ctxt->pkg1 = (void *)malloc(BOOTLOADER_SIZE);

try_load:
	// Read package1.
	emummc_storage_set_mmc_partition(&emmc_storage, EMMC_BOOT0);
	emummc_storage_read(&emmc_storage, bootloader_offset / NX_EMMC_BLOCKSIZE, BOOTLOADER_SIZE / NX_EMMC_BLOCKSIZE, ctxt->pkg1);

	ctxt->pkg1_id = pkg1_identify(ctxt->pkg1 + pk1_offset);
	if (!ctxt->pkg1_id)
	{
		_hos_crit_error("Unknown pkg1 version.");
		EPRINTFARGS("HOS version not supported!%s",
			(emu_cfg.enabled && !h_cfg.emummc_force_disable) ? "\nOr emuMMC corrupt!" : "");

		// Try backup bootloader.
		if (bootloader_offset != BOOTLOADER_BACKUP_OFFSET)
		{
			EPRINTF("Trying backup bootloader...");
			bootloader_offset = BOOTLOADER_BACKUP_OFFSET;
			goto try_load;
		}

		return 0;
	}
	gfx_printf("Identified pkg1 and mkey %d\n\n", ctxt->pkg1_id->kb);

	// Read the correct keyblob.
	ctxt->keyblob = (u8 *)calloc(NX_EMMC_BLOCKSIZE, 1);
	emummc_storage_read(&emmc_storage, HOS_KEYBLOBS_OFFSET / NX_EMMC_BLOCKSIZE + ctxt->pkg1_id->kb, 1, ctxt->keyblob);

	return 1;
}

static u8 *_read_emmc_pkg2(launch_ctxt_t *ctxt)
{
	u8 *bctBuf = NULL;

	emummc_storage_set_mmc_partition(&emmc_storage, EMMC_GPP);

	// Parse eMMC GPT.
	LIST_INIT(gpt);
	nx_emmc_gpt_parse(&gpt, &emmc_storage);
DPRINTF("Parsed GPT\n");
	// Find package2 partition.
	emmc_part_t *pkg2_part = nx_emmc_part_find(&gpt, "BCPKG2-1-Normal-Main");
	if (!pkg2_part)
		goto out;

	// Read in package2 header and get package2 real size.
	static const u32 BCT_SIZE = 0x4000;
	bctBuf = (u8 *)malloc(BCT_SIZE);
	nx_emmc_part_read(&emmc_storage, pkg2_part, BCT_SIZE / NX_EMMC_BLOCKSIZE, 1, bctBuf);
	u32 *hdr = (u32 *)(bctBuf + 0x100);
	u32 pkg2_size = hdr[0] ^ hdr[2] ^ hdr[3];
DPRINTF("pkg2 size on emmc is %08X\n", pkg2_size);

	// Read in Boot Config.
	memset(bctBuf, 0, BCT_SIZE);
	nx_emmc_part_read(&emmc_storage, pkg2_part, 0, BCT_SIZE / NX_EMMC_BLOCKSIZE, bctBuf);

	// Read in package2.
	u32 pkg2_size_aligned = ALIGN(pkg2_size, NX_EMMC_BLOCKSIZE);
DPRINTF("pkg2 size aligned is %08X\n", pkg2_size_aligned);
	ctxt->pkg2 = malloc(pkg2_size_aligned);
	ctxt->pkg2_size = pkg2_size;
	nx_emmc_part_read(&emmc_storage, pkg2_part, BCT_SIZE / NX_EMMC_BLOCKSIZE,
		pkg2_size_aligned / NX_EMMC_BLOCKSIZE, ctxt->pkg2);
out:
	nx_emmc_gpt_free(&gpt);

	return bctBuf;
}

static void _free_launch_components(launch_ctxt_t *ctxt)
{
	free(ctxt->keyblob);
	free(ctxt->pkg1);
	free(ctxt->pkg2);
	free(ctxt->warmboot);
	free(ctxt->secmon);
	free(ctxt->kernel);
	free(ctxt->kip1_patches);
}

static bool _get_fs_exfat_compatible(link_t *info, bool *fs_is_510)
{
	u32 fs_idx;
	u32 fs_ids_cnt;
	u32 sha_buf[32 / sizeof(u32)];
	kip1_id_t *kip_ids;

	LIST_FOREACH_ENTRY(pkg2_kip1_info_t, ki, info, link)
	{
		if (strncmp((const char*)ki->kip1->name, "FS", 2))
			continue;

		if (!se_calc_sha256_oneshot(sha_buf, ki->kip1, ki->size))
			break;

		pkg2_get_ids(&kip_ids, &fs_ids_cnt);

		for (fs_idx = 0; fs_idx < fs_ids_cnt; fs_idx++)
		{
			if (!memcmp(sha_buf, kip_ids[fs_idx].hash, 8))
			{
				// Check if it's 5.1.0.
				if ((fs_idx & ~1) == 16)
					*fs_is_510 = true;

				// Check if FAT32-only.
				if (fs_ids_cnt <= fs_idx && !(fs_idx & 1))
					return false;

				// FS is FAT32 + exFAT.
				break;
			}
		}

		break;
	}

	// Hash didn't match or FAT32 + exFAT.
	return true;
}

int hos_launch(ini_sec_t *cfg)
{
	u8 kb;
	u32 secmon_base;
	u32 warmboot_base;
	launch_ctxt_t ctxt;
	bool exo_new = false;
	tsec_ctxt_t tsec_ctxt;
	volatile secmon_mailbox_t *secmon_mailbox;

	minerva_change_freq(FREQ_1600);
	memset(&ctxt, 0, sizeof(launch_ctxt_t));
	memset(&tsec_ctxt, 0, sizeof(tsec_ctxt_t));
	list_init(&ctxt.kip1_list);

	ctxt.cfg = cfg;

	if (!gfx_con.mute)
		gfx_clear_grey(0x1B);
	gfx_con_setpos(0, 0);

	gfx_puts("Initializing...\n\n");

	// Initialize eMMC/emuMMC.
	int res = emummc_storage_init_mmc(&emmc_storage, &emmc_sdmmc);
	if (res)
	{
		if (res == 2)
			_hos_crit_error("Failed to init eMMC");
		else
			_hos_crit_error("Failed to init emuMMC");

		goto error;
	}

	// Read package1 and the correct keyblob.
	if (!_read_emmc_pkg1(&ctxt))
		goto error;

	kb = ctxt.pkg1_id->kb;

	// Try to parse config if present.
	if (ctxt.cfg && !parse_boot_config(&ctxt))
	{
		_hos_crit_error("Wrong ini cfg or missing files!");
		goto error;
	}

	bool emummc_enabled = emu_cfg.enabled && !h_cfg.emummc_force_disable;

	// Enable emummc patching.
	if (emummc_enabled)
	{
		if (ctxt.stock)
		{
			_hos_crit_error("Stock emuMMC is not supported yet!");
			goto error;
		}

		ctxt.atmosphere = true; // Set atmosphere patching in case of Stock emuMMC and no fss0.
		config_kip1patch(&ctxt, "emummc");
	}
	else if (!emu_cfg.enabled && ctxt.emummc_forced)
	{
		_hos_crit_error("emuMMC is forced but not enabled!");
		goto error;
	}

	// Check if fuses lower than 4.0.0 or 9.0.0 and if yes apply NO Gamecard patch.
	// Additionally check if running emuMMC and disable GC if v3 fuses are burnt and HOS is <= 8.1.0.
	if (!ctxt.stock)
	{
		u32 fuses = fuse_read_odm(7);
		if ((h_cfg.autonogc &&
				((!(fuses & ~0xF) && (kb >= KB_FIRMWARE_VERSION_400)) || // LAFW v2.
				(!(fuses & ~0x3FF) && (kb >= KB_FIRMWARE_VERSION_900)))) // LAFW v3.
			|| ((emummc_enabled) &&
				((fuses & 0x400) && (kb <= KB_FIRMWARE_VERSION_810))))
			config_kip1patch(&ctxt, "nogc");
	}

	gfx_puts("Loaded config, pkg1 and keyblob\n");

	// Check if secmon is new exosphere.
	if (ctxt.secmon)
		exo_new = !memcmp((void *)((u8 *)ctxt.secmon + ctxt.secmon_size - 4), "LENY", 4);
	const pkg1_id_t *pk1_latest = pkg1_get_latest();
	secmon_base = exo_new ? pk1_latest->secmon_base : ctxt.pkg1_id->secmon_base;
	warmboot_base = exo_new ? pk1_latest->warmboot_base : ctxt.pkg1_id->warmboot_base;
	h_cfg.aes_slots_new = exo_new;

	// Generate keys.
	if (!h_cfg.se_keygen_done)
	{
		tsec_ctxt.fw = (u8 *)ctxt.pkg1 + ctxt.pkg1_id->tsec_off;
		tsec_ctxt.pkg1 = ctxt.pkg1;
		tsec_ctxt.pkg11_off = ctxt.pkg1_id->pkg11_off;
		tsec_ctxt.secmon_base = secmon_base;

		if (kb >= KB_FIRMWARE_VERSION_700 && !h_cfg.sept_run)
		{
			_hos_crit_error("Failed to run sept");
			goto error;
		}

		if (!hos_keygen(ctxt.keyblob, kb, &tsec_ctxt, &ctxt))
			goto error;
		gfx_puts("Generated keys\n");
		if (kb <= KB_FIRMWARE_VERSION_600)
			h_cfg.se_keygen_done = 1;
	}

	// Decrypt and unpack package1 if we require parts of it.
	if (!ctxt.warmboot || !ctxt.secmon)
	{
		// Decrypt PK1 or PK11.
		if (kb <= KB_FIRMWARE_VERSION_600 || h_cfg.t210b01)
		{
			if (!pkg1_decrypt(ctxt.pkg1_id, ctxt.pkg1))
			{
				_hos_crit_error("Pkg1 decryption failed!");
				if (h_cfg.t210b01)
					EPRINTF("Is BEK missing?");
				goto error;
			}
		}

		// Unpack PK11.
		if (h_cfg.t210b01 || (kb <= KB_FIRMWARE_VERSION_620 && !emummc_enabled))
		{
			// Skip T210B01 OEM header.
			u32 pk1_offset = 0;
			if (h_cfg.t210b01)
				pk1_offset = sizeof(bl_hdr_t210b01_t);

			pkg1_unpack((void *)warmboot_base, &ctxt.warmboot_size,
				!exo_new ? (void *)ctxt.pkg1_id->secmon_base : NULL, NULL,
				ctxt.pkg1_id, ctxt.pkg1 + pk1_offset);

			gfx_puts("Decrypted & unpacked pkg1\n");
		}
		else
		{
			_hos_crit_error("No mandatory secmon or warmboot provided!");
			goto error;
		}
	}

	// Configure and manage Warmboot binary.
	pkg1_warmboot_config(&ctxt, kb, warmboot_base);

	// Replace 'warmboot.bin' if requested.
	if (ctxt.warmboot)
		memcpy((void *)warmboot_base, ctxt.warmboot, ctxt.warmboot_size);
	else if (!h_cfg.t210b01)
	{
		// Patch warmboot on T210 to allow downgrading.
		if (kb >= KB_FIRMWARE_VERSION_700)
		{
			_hos_crit_error("No warmboot provided!");
			goto error;
		}
		// Else we patch it to allow downgrading.
		patch_t *warmboot_patchset = ctxt.pkg1_id->warmboot_patchset;
		gfx_printf("%kPatching Warmboot%k\n", 0xFFFFBA00, 0xFFCCCCCC);
		for (u32 i = 0; warmboot_patchset[i].off != 0xFFFFFFFF; i++)
			*(vu32 *)(ctxt.pkg1_id->warmboot_base + warmboot_patchset[i].off) = warmboot_patchset[i].val;
	}

	// Replace 'SecureMonitor' if requested or patch Pkg2 checks if needed.
	if (ctxt.secmon)
		memcpy((void *)secmon_base, ctxt.secmon, ctxt.secmon_size);
	else if (ctxt.pkg1_id->secmon_patchset)
	{
		// Else we patch it to allow for an unsigned package2 and patched kernel.
		patch_t *secmon_patchset = ctxt.pkg1_id->secmon_patchset;
		gfx_printf("%kPatching Secure Monitor%k\n", 0xFFFFBA00, 0xFFCCCCCC);
		for (u32 i = 0; secmon_patchset[i].off != 0xFFFFFFFF; i++)
			*(vu32 *)(ctxt.pkg1_id->secmon_base + secmon_patchset[i].off) = secmon_patchset[i].val;
	}

	gfx_puts("Loaded warmboot and secmon\n");

	// Read package2.
	u8 *bootConfigBuf = _read_emmc_pkg2(&ctxt);
	if (!bootConfigBuf)
	{
		_hos_crit_error("Pkg2 read failed!");
		goto error;
	}

	gfx_puts("Read pkg2\n");

	// Decrypt package2 and parse KIP1 blobs in INI1 section.
	pkg2_hdr_t *pkg2_hdr = pkg2_decrypt(ctxt.pkg2, kb);
	if (!pkg2_hdr)
	{
		_hos_crit_error("Pkg2 decryption failed!");
		EPRINTFARGS("Is hekate%s updated?", kb >= KB_FIRMWARE_VERSION_700 ? " or Sept" : "");

		// Clear EKS slot, in case something went wrong with sept keygen.
		if (kb >= KB_FIRMWARE_VERSION_700)
			hos_eks_clear(kb);
		goto error;
	}
	else if (kb >= KB_FIRMWARE_VERSION_700)
		hos_eks_save(kb); // Save EKS slot if it doesn't exist.

	LIST_INIT(kip1_info);
	if (!pkg2_parse_kips(&kip1_info, pkg2_hdr, &ctxt.new_pkg2))
	{
		_hos_crit_error("INI1 parsing failed!");
		goto error;
	}

	gfx_puts("Parsed ini1\n");

	// Use the kernel included in package2 in case we didn't load one already.
	if (!ctxt.kernel)
	{
		ctxt.kernel = pkg2_hdr->data;
		ctxt.kernel_size = pkg2_hdr->sec_size[PKG2_SEC_KERNEL];

		if (!ctxt.stock && (ctxt.svcperm || ctxt.debugmode || ctxt.atmosphere))
		{
			// Hash only Kernel when it embeds INI1.
			u8 kernel_hash[0x20];
			if (!ctxt.new_pkg2)
				se_calc_sha256_oneshot(kernel_hash, ctxt.kernel, ctxt.kernel_size);
			else
				se_calc_sha256_oneshot(kernel_hash, ctxt.kernel + PKG2_NEWKERN_START,
					pkg2_newkern_ini1_start - PKG2_NEWKERN_START);

			ctxt.pkg2_kernel_id = pkg2_identify(kernel_hash);
			if (!ctxt.pkg2_kernel_id)
			{
				_hos_crit_error("Failed to identify kernel!");

				goto error;
			}

			// In case a kernel patch option is set; allows to disable SVC verification or/and enable debug mode.
			kernel_patch_t *kernel_patchset = ctxt.pkg2_kernel_id->kernel_patchset;
			if (kernel_patchset != NULL)
			{
				gfx_printf("%kPatching kernel%k\n", 0xFFFFBA00, 0xFFCCCCCC);
				u32 *temp;
				for (u32 i = 0; kernel_patchset[i].id != 0xFFFFFFFF; i++)
				{
					if ((ctxt.svcperm && kernel_patchset[i].id == SVC_VERIFY_DS)
					|| (ctxt.debugmode && kernel_patchset[i].id == DEBUG_MODE_EN && !(ctxt.atmosphere && ctxt.secmon))
					|| (ctxt.atmosphere && kernel_patchset[i].id == ATM_GEN_PATCH))
						*(vu32 *)(ctxt.kernel + kernel_patchset[i].off) = kernel_patchset[i].val;
					else if (ctxt.atmosphere && kernel_patchset[i].id == ATM_ARR_PATCH)
					{
						temp = (u32 *)kernel_patchset[i].ptr;
						for (u32 j = 0; j < kernel_patchset[i].val; j++)
							*(vu32 *)(ctxt.kernel + kernel_patchset[i].off + (j << 2)) = temp[j];
					}
					else if (kernel_patchset[i].id < SVC_VERIFY_DS)
						*(vu32 *)(ctxt.kernel + kernel_patchset[i].off) = kernel_patchset[i].val;
				}
			}
		}
	}

	// Merge extra KIP1s into loaded ones.
	LIST_FOREACH_ENTRY(merge_kip_t, mki, &ctxt.kip1_list, link)
		pkg2_merge_kip(&kip1_info, (pkg2_kip1_t *)mki->kip1);

	// Check if FS is compatible with exFAT and if 5.1.0.
	if (!ctxt.stock && (sd_fs.fs_type == FS_EXFAT || kb == KB_FIRMWARE_VERSION_500))
	{
		bool exfat_compat = _get_fs_exfat_compatible(&kip1_info, &ctxt.exo_ctx.fs_is_510);

		if (sd_fs.fs_type == FS_EXFAT && !exfat_compat)
		{
			_hos_crit_error("SD Card is exFAT and installed HOS driver\nonly supports FAT32!");

			_free_launch_components(&ctxt);
			goto error;
		}
	}

	// Patch kip1s in memory if needed.
	gfx_printf("%kPatching kips%k\n", 0xFFFFBA00, 0xFFCCCCCC);
	const char* unappliedPatch = pkg2_patch_kips(&kip1_info, ctxt.kip1_patches);
	if (unappliedPatch != NULL)
	{
		EHPRINTFARGS("Failed to apply '%s'!", unappliedPatch);

		bool emmc_patch_failed = !strcmp(unappliedPatch, "emummc");
		if (!emmc_patch_failed)
		{
			gfx_puts("\nPress POWER to continue.\nPress VOL to go to the menu.\n");
			display_backlight_brightness(h_cfg.backlight, 1000);
		}

		if (emmc_patch_failed || !(btn_wait() & BTN_POWER))
		{
			_free_launch_components(&ctxt);
			goto error; // MUST stop here, because if user requests 'nogc' but it's not applied, their GC controller gets updated!
		}
	}

	// Rebuild and encrypt package2.
	pkg2_build_encrypt((void *)PKG2_LOAD_ADDR, &ctxt, &kip1_info);

	gfx_puts("Rebuilt & loaded pkg2\n");

	gfx_printf("\n%kBooting...%k\n", 0xFF96FF00, 0xFFCCCCCC);

	// Set initial mailbox values.
	int bootStateDramPkg2 = 0;
	int bootStatePkg2Continue = 0;

	// Clear pkg1/pkg2 keys.
	se_aes_key_clear(8);
	se_aes_key_clear(11);

	// Finalize per firmware key access. Skip access control if new exosphere.
	switch (kb | (exo_new << 7))
	{
	case KB_FIRMWARE_VERSION_100_200:
	case KB_FIRMWARE_VERSION_300:
	case KB_FIRMWARE_VERSION_301:
		se_key_acc_ctrl(12, SE_KEY_TBL_DIS_KEY_ACCESS_FLAG | SE_KEY_TBL_DIS_KEY_LOCK_FLAG);
		se_key_acc_ctrl(13, SE_KEY_TBL_DIS_KEY_ACCESS_FLAG | SE_KEY_TBL_DIS_KEY_LOCK_FLAG);
		bootStateDramPkg2 = 2;
		bootStatePkg2Continue = 3;
		break;
	case KB_FIRMWARE_VERSION_400:
	case KB_FIRMWARE_VERSION_500:
	case KB_FIRMWARE_VERSION_600:
		se_key_acc_ctrl(12, SE_KEY_TBL_DIS_KEY_ACCESS_FLAG | SE_KEY_TBL_DIS_KEY_LOCK_FLAG);
		se_key_acc_ctrl(15, SE_KEY_TBL_DIS_KEY_ACCESS_FLAG | SE_KEY_TBL_DIS_KEY_LOCK_FLAG);
	default:
		bootStateDramPkg2 = 2;
		bootStatePkg2Continue = 4;
		break;
	}

	// Clear BCT area for retail units and copy it over if dev unit.
	if (kb <= KB_FIRMWARE_VERSION_500 && !exo_new)
	{
		memset((void *)SECMON_BCT_CFG_ADDR, 0, 0x3000);
		if ((fuse_read_odm(4) & 3) == 3)
			memcpy((void *)SECMON_BCT_CFG_ADDR, bootConfigBuf, 0x1000);
	}
	else
	{
		memset((void *)SECMON6_BCT_CFG_ADDR, 0, 0x800);
		if ((fuse_read_odm(4) & 3) == 3)
			memcpy((void *)SECMON6_BCT_CFG_ADDR, bootConfigBuf, 0x800);
	}
	free(bootConfigBuf);

	// Config Exosphère if booting full Atmosphère.
	if (ctxt.atmosphere && ctxt.secmon)
		config_exosphere(&ctxt, warmboot_base, exo_new);

	// Unmount SD card and eMMC.
	sd_end();
	sdmmc_storage_end(&emmc_storage);

	// Finalize MC carveout.
	if (kb <= KB_FIRMWARE_VERSION_301 && !exo_new)
		mc_config_carveout();

	// Lock SE before starting 'SecureMonitor' if < 6.2.0, otherwise lock bootrom and ipatches.
	_se_lock(kb <= KB_FIRMWARE_VERSION_600 && !exo_new);

	// Reset sysctr0 counters.
	if (kb >= KB_FIRMWARE_VERSION_620)
		_sysctr0_reset();

	// < 4.0.0 pkg1.1 locks PMC scratches.
	//_pmc_scratch_lock(kb);

	// Set secmon mailbox address and clear it.
	if (kb >= KB_FIRMWARE_VERSION_700 || exo_new)
	{
		memset((void *)SECMON7_MAILBOX_ADDR, 0, 0x200);
		secmon_mailbox = (secmon_mailbox_t *)(SECMON7_MAILBOX_ADDR + SECMON_STATE_OFFSET);
	}
	else
	{
		if (kb <= KB_FIRMWARE_VERSION_301)
			memset((void *)SECMON_MAILBOX_ADDR, 0, 0x200);
		secmon_mailbox = (secmon_mailbox_t *)(SECMON_MAILBOX_ADDR + SECMON_STATE_OFFSET);
	}

	// Start from DRAM ready signal and reset outgoing value.
	secmon_mailbox->in = bootStateDramPkg2;
	secmon_mailbox->out = 0;

	// Disable display. This must be executed before secmon to provide support for all fw versions.
	display_end();

	// Clear EMC_SCRATCH0.
	EMC(EMC_SCRATCH0) = 0;

	// Hold USBD, USB2, AHBDMA and APBDMA in reset for SoC state validation on sleep.
	CLOCK(CLK_RST_CONTROLLER_RST_DEV_L_SET) = BIT(CLK_L_USBD);
	CLOCK(CLK_RST_CONTROLLER_RST_DEV_H_SET) = BIT(CLK_H_AHBDMA) | BIT(CLK_H_APBDMA) | BIT(CLK_H_USB2);

	// Flush cache and disable MMU.
	bpmp_mmu_disable();
	bpmp_clk_rate_set(BPMP_CLK_NORMAL);

	// emuMMC: Some cards (Sandisk U1), do not like a fast power cycle. Wait min 100ms.
	sdmmc_storage_init_wait_sd();

	// Launch secmon.
	if (smmu_is_used())
		smmu_exit();
	else
		ccplex_boot_cpu0(secmon_base);

	// Wait for secmon to get ready.
	while (!secmon_mailbox->out)
		;

	// Signal pkg2 ready and continue boot.
	secmon_mailbox->in = bootStatePkg2Continue;

	// Halt ourselves in waitevent state and resume if there's JTAG activity.
	while (true)
		bpmp_halt();

error:
	sdmmc_storage_end(&emmc_storage);
	h_cfg.aes_slots_new = false;
	return 0;
}