/*
 * Copyright (c) 2018-2019 Atmosphère-NX
 *
 * 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/>.
 */
 
#ifndef EXOSPHERE_BOOTCONFIG_H
#define EXOSPHERE_BOOTCONFIG_H

#include <stdbool.h>
#include <stdint.h>
#include "memory_map.h"

/* This is kind of ConfigItem, but it's stored in BootConfig, so... */
typedef enum {
    KERNELCONFIGFLAG_INITIALIZE_MEMORY_TO_PATTERN   = (1 << 0),
    KERNELCONFIGFLAG_ENABLE_USER_EXCEPTION_HANDLERS = (1 << 1),
    KERNELCONFIGFLAG_ENABLE_USER_PMU_ACCESS         = (1 << 2),
    KERNELCONFIGFLAG_CALL_SMC_PANIC_ON_KERNEL_ERROR = (1 << 8),
} KernelConfigFlag;

/* This provides management for Switch BootConfig. */

#define LOADED_BOOTCONFIG (get_loaded_bootconfig())

typedef struct {
    uint8_t data[0x200];
} bootconfig_unsigned_config_t;

typedef struct {
    uint8_t _0x0[8];
    uint8_t package2_config;
    uint8_t _0x9[7];
    uint8_t hardware_info[0x10];
    uint8_t disable_program_verification;
    uint8_t _0x21[0xDF];
} bootconfig_signed_config_t;

typedef struct {
    bootconfig_unsigned_config_t unsigned_config;
    uint8_t signature[0x100];
    bootconfig_signed_config_t signed_config;
} bootconfig_t;

static inline bootconfig_t *get_loaded_bootconfig(void) {
    /* this is also get_exception_entry_stack_address(2) */
    return (bootconfig_t *)(TZRAM_GET_SEGMENT_ADDRESS(TZRAM_SEGEMENT_ID_SECMON_EVT) + 0x180);
}

typedef struct {
    uint32_t bootloader_version;
    uint32_t bootloader_start_block;
    uint32_t bootloader_start_page;
    uint32_t bootloader_attribute;
    uint32_t boot_reason_value;
    uint32_t boot_reason_state;
} boot_reason_t;

void bootconfig_load_and_verify(const bootconfig_t *bootconfig);
void bootconfig_clear(void);

void bootconfig_load_boot_reason(volatile boot_reason_t *boot_reason);

void bootconfig_set_package2_hash_for_recovery(const void *package2, size_t package2_size);
void bootconfig_get_package2_hash_for_recovery(uint64_t *out_hash);

/* Actual configuration getters. */
bool bootconfig_is_package2_plaintext(void);
bool bootconfig_is_package2_unsigned(void);
void bootconfig_set_package2_plaintext_and_unsigned(void);
bool bootconfig_disable_program_verification(void);
bool bootconfig_is_debug_mode(void);

bool bootconfig_take_extabt_serror_to_el3(void);

uint64_t bootconfig_get_value_for_sysctr0(void);

uint64_t bootconfig_get_memory_arrangement(void);
uint64_t bootconfig_get_kernel_configuration(void);

bool bootconfig_is_recovery_boot(void);
uint64_t bootconfig_get_boot_reason(void);

#endif