/*
 * Copyright (c) 2019 CTCaer
 *
 * 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 "fss.h"
#include "sept.h"
#include "../config.h"
#include <utils/ini.h>
#include <gfx/di.h>
#include <libs/fatfs/ff.h>
#include <mem/heap.h>
#include <soc/hw_init.h>
#include <soc/pmc.h>
#include <soc/t210.h>
#include "../storage/nx_emmc.h"
#include <storage/nx_sd.h>
#include <storage/sdmmc.h>
#include <utils/btn.h>
#include <utils/list.h>
#include <utils/types.h>

#include <gfx_utils.h>

#define PATCHED_RELOC_SZ 0x94

#define WB_RST_ADDR 0x40010ED0
#define WB_RST_SIZE 0x30

u8 warmboot_reboot[] = {
	0x14, 0x00, 0x9F, 0xE5, // LDR R0, =0x7000E450
	0x01, 0x10, 0xB0, 0xE3, // MOVS R1, #1
	0x00, 0x10, 0x80, 0xE5, // STR R1, [R0]
	0x0C, 0x00, 0x9F, 0xE5, // LDR R0, =0x7000E400
	0x10, 0x10, 0xB0, 0xE3, // MOVS R1, #0x10
	0x00, 0x10, 0x80, 0xE5, // STR R1, [R0]
	0xFE, 0xFF, 0xFF, 0xEA, // LOOP
	0x50, 0xE4, 0x00, 0x70, // #0x7000E450
	0x00, 0xE4, 0x00, 0x70  // #0x7000E400
};

#define SEPT_PRI_ADDR   0x4003F000

#define SEPT_PK1T_ADDR  0xC0400000
#define SEPT_PK1T_STACK 0x40008000
#define SEPT_TCSZ_ADDR  (SEPT_PK1T_ADDR - 0x4)
#define SEPT_STG1_ADDR  (SEPT_PK1T_ADDR + 0x2E100)
#define SEPT_STG2_ADDR  (SEPT_PK1T_ADDR + 0x60E0)
#define SEPT_PKG_SZ     (0x2F100 + WB_RST_SIZE)

extern boot_cfg_t b_cfg;
extern void reloc_patcher(u32 payload_dst, u32 payload_src, u32 payload_size);

int reboot_to_sept(const u8 *tsec_fw, const u32 tsec_size, const u32 kb)
{
	FIL fp;
	bool fss0_sept_used = false;

	// Copy warmboot reboot code and TSEC fw.
	memcpy((u8 *)(SEPT_PK1T_ADDR - WB_RST_SIZE), (u8 *)warmboot_reboot, sizeof(warmboot_reboot));
	memcpy((void *)SEPT_PK1T_ADDR, tsec_fw, tsec_size);
	*(vu32 *)SEPT_TCSZ_ADDR = tsec_size;

	LIST_INIT(ini_sections);
	if (ini_parse(&ini_sections, "bootloader/hekate_ipl.ini", false))
	{
		bool found = false;
		LIST_FOREACH_ENTRY(ini_sec_t, ini_sec, &ini_sections, link)
		{
			// Only parse non config sections.
			if (ini_sec->type == INI_CHOICE && strcmp(ini_sec->name, "config"))
			{
				LIST_FOREACH_ENTRY(ini_kv_t, kv, &ini_sec->kvs, link)
				{
					if (!strcmp("fss0", kv->key))
					{
						fss0_sept_t sept_ctxt;
						sept_ctxt.kb = kb;
						sept_ctxt.sept_primary = (void *)SEPT_STG1_ADDR;
						sept_ctxt.sept_secondary = (void *)SEPT_STG2_ADDR;
						fss0_sept_used = parse_fss(NULL, kv->val, &sept_ctxt);

						found = true;
						break;
					}
				}
			}
			if (found)
				break;
		}
	}


	if (!fss0_sept_used)
	{
		// Copy sept-primary.
		if (f_open(&fp, "sd:/sept/sept-primary.bin", FA_READ))
			goto error;

		if (f_read(&fp, (u8 *)SEPT_STG1_ADDR, f_size(&fp), NULL))
		{
			f_close(&fp);
			goto error;
		}
		f_close(&fp);

		// Copy sept-secondary.
		if (kb < KB_FIRMWARE_VERSION_810)
		{
			if (f_open(&fp, "sd:/sept/sept-secondary_00.enc", FA_READ))
				if (f_open(&fp, "sd:/sept/sept-secondary.enc", FA_READ)) // Try the deprecated version.
					goto error;
		}
		else
		{
			if (f_open(&fp, "sd:/sept/sept-secondary_01.enc", FA_READ))
				goto error;
		}

		if (f_read(&fp, (u8 *)SEPT_STG2_ADDR, f_size(&fp), NULL))
		{
			f_close(&fp);
			goto error;
		}
		f_close(&fp);
	}

	// Save auto boot config to sept payload, if any.
	boot_cfg_t *tmp_cfg = malloc(sizeof(boot_cfg_t));
	memcpy(tmp_cfg, &b_cfg, sizeof(boot_cfg_t));

	tmp_cfg->boot_cfg |= BOOT_CFG_SEPT_RUN;

	if (f_open(&fp, "sd:/sept/payload.bin", FA_READ | FA_WRITE))
	{
		free(tmp_cfg);
		goto error;
	}

	f_lseek(&fp, PATCHED_RELOC_SZ);
	f_write(&fp, tmp_cfg, sizeof(boot_cfg_t), NULL);

	f_close(&fp);

	sd_unmount();
	gfx_printf("\n%kPress Power or Vol +/-\n   to Reboot to Sept...", colors[0]);

	u32 pk1t_sept = SEPT_PK1T_ADDR - (ALIGN(PATCHED_RELOC_SZ, 0x10) + WB_RST_SIZE);

	void (*sept)() = (void *)pk1t_sept;

	reloc_patcher(WB_RST_ADDR, pk1t_sept, SEPT_PKG_SZ);

	// Patch SDRAM init to perform an SVC immediately after second write.
	PMC(APBDEV_PMC_SCRATCH45) = 0x2E38DFFF;
	PMC(APBDEV_PMC_SCRATCH46) = 0x6001DC28;
	// Set SVC handler to jump to sept-primary in IRAM.
	PMC(APBDEV_PMC_SCRATCH33) = SEPT_PRI_ADDR;
	PMC(APBDEV_PMC_SCRATCH40) = 0x6000F208;

	reconfig_hw_workaround(false, 0);

	(*sept)();

error:
	EPRINTF("\nSept files not found in sd:/sept!\nPlace appropriate files and try again.");
	display_backlight_brightness(100, 1000);

	btn_wait();

	return 0;
}