Atmosphere/exosphere/smc_api.c

#include <stdint.h>

#include "utils.h"
#include "smc_api.h"

#define SMC_USER_HANDLERS 0x13
#define SMC_PRIV_HANDLERS 0x9

/* User SMC prototypes */
uint32_t smc_set_config(smc_args_t *args);
uint32_t smc_get_config(smc_args_t *args);
uint32_t smc_check_status(smc_args_t *args);
uint32_t smc_get_result(smc_args_t *args);
uint32_t smc_exp_mod(smc_args_t *args);
uint32_t smc_get_random_bytes_for_user(smc_args_t *args);
uint32_t smc_generate_aes_kek(smc_args_t *args);
uint32_t smc_load_aes_key(smc_args_t *args);
uint32_t smc_crypt_aes(smc_args_t *args);
uint32_t smc_generate_specific_aes_key(smc_args_t *args);
uint32_t smc_compute_cmac(smc_args_t *args);
uint32_t smc_load_rsa_private_key(smc_args_t *args);
uint32_t smc_decrypt_rsa_private_key(smc_args_t *args);
uint32_t smc_load_rsa_oaep_key(smc_args_t *args);
uint32_t smc_rsa_oaep(smc_args_t *args);
uint32_t smc_unwrap_rsa_wrapped_titlekey(smc_args_t *args);
uint32_t smc_load_titlekey(smc_args_t *args);
uint32_t smc_unwrap_aes_wrapped_titlekey(smc_args_t *args);

/* Privileged SMC prototypes */
uint32_t smc_cpu_suspend(smc_args_t *args);
uint32_t smc_cpu_off(smc_args_t *args);
uint32_t smc_cpu_on(smc_args_t *args);
/* uint32_t smc_get_config(smc_args_t *args); */
uint32_t smc_get_random_bytes_for_priv(smc_args_t *args);
uint32_t smc_panic(smc_args_t *args);
uint32_t smc_configure_carveout(smc_args_t *args);
uint32_t smc_read_write_register(smc_args_t *args);

typedef struct {
    uint32_t id;
    uint32_t (*handler)(smc_args_t *args);
} smc_table_entry_t;

typedef struct {
    smc_table_entry_t *handlers;
    uint32_t num_handlers;
} smc_table_t;

smc_table_entry_t g_smc_user_table[SMC_USER_HANDLERS] = {
    {0, NULL},
    {0xC3000401, smc_set_config},
    {0xC3000002, smc_get_config},
    {0xC3000003, smc_check_status},
    {0xC3000404, smc_get_result},
    {0xC3000E05, smc_exp_mod},
    {0xC3000006, smc_get_random_bytes_for_user},
    {0xC3000007, smc_generate_aes_kek},
    {0xC3000008, smc_load_aes_key},
    {0xC3000009, smc_crypt_aes},
    {0xC300000A, smc_generate_specific_aes_key},
    {0xC300040B, smc_compute_cmac},
    {0xC300100C, smc_load_rsa_private_key},
    {0xC300100D, smc_decrypt_rsa_private_key},
    {0xC300100E, smc_load_rsa_oaep_key},
    {0xC300060F, smc_rsa_oaep},
    {0xC3000610, smc_unwrap_rsa_wrapped_titlekey},
    {0xC3000011, smc_load_titlekey},
    {0xC3000012, smc_unwrap_aes_wrapped_titlekey}
};

smc_table_entry_t g_smc_priv_table[SMC_PRIV_HANDLERS] = {
    {0, NULL},
    {0xC4000001, smc_cpu_suspend},
    {0x84000002, smc_cpu_off},
    {0xC4000003, smc_cpu_on},
    {0xC3000004, smc_get_config}, /* NOTE: Same function as for USER */
    {0xC3000005, smc_get_random_bytes_for_priv},
    {0xC3000006, smc_panic},
    {0xC3000007, smc_configure_carveout},
    {0xC3000008, smc_read_write_register}
};

smc_table_t g_smc_tables[2] = {
    { /* SMC_HANDLER_USER */
        g_smc_user_table,
        SMC_USER_HANDLERS
    },
    { /* SMC_HANDLER_PRIV */
        g_smc_priv_table,
        SMC_PRIV_HANDLERS
    }
};

int g_is_smc_in_progress = 0;

void call_smc_handler(uint32_t handler_id, smc_args_t *args) {
    unsigned char smc_id;
    unsigned int result;
    unsigned int (*smc_handler)(smc_args_t *args);
    
    /* Validate top-level handler. */
    if (handler_id != SMC_HANDLER_USER && handler_id != SMC_HANDLER_PRIV) {
        panic();
    }
    
    /* Validate sub-handler index */
    if ((smc_id = (unsigned char)args->X[0]) >= g_smc_tables[handler_id].num_handlers) {
        panic();
    }
    
    /* Validate sub-handler */
    if (g_smc_tables[handler_id].handlers[smc_id].id != args->X[0]) {
        panic();
    }
    
    /* Validate handler. */
    if ((smc_handler = g_smc_tables[handler_id].handlers[smc_id].handler) == NULL) {
        panic();
    }
    
    /* Call function. */
    args->X[0] = smc_handler(args);
}

uint32_t smc_wrapper_sync(smc_args_t *args, uint32_t (*handler)(smc_args_t *)) {
    uint32_t result;
    /* TODO: Make g_is_smc_in_progress atomic. */
    if (g_is_smc_in_progress) {
        return 3;
    }
    g_is_smc_in_progress = 1;
    result = handler(args);
    g_is_smc_in_progress = 0;
    return result;
}

uint32_t smc_wrapper_async(smc_args_t *args, uint32_t (*handler)(smc_args_t *), uint32_t (*callback)(void, void));