void system_disable_jump(void)
{
disable_jump = 1;
#ifdef CONFIG_MPU
if (system_is_locked()) {
int ret;
int enable_mpu = 0;
enum system_image_copy_t copy;
CPRINTS("MPU type: %08x", mpu_get_type());
/*
* Protect RAM from code execution
*/
ret = mpu_protect_ram();
if (ret == EC_SUCCESS) {
enable_mpu = 1;
CPRINTS("RAM locked. Exclusion %08x-%08x",
&__iram_text_start, &__iram_text_end);
} else {
CPRINTS("Failed to lock RAM (%d)", ret);
}
/*
* Protect inactive image (ie. RO if running RW, vice versa)
* from code execution.
*/
switch (system_get_image_copy()) {
case SYSTEM_IMAGE_RO:
ret = mpu_lock_rw_flash();
copy = SYSTEM_IMAGE_RW;
break;
case SYSTEM_IMAGE_RW:
ret = mpu_lock_ro_flash();
copy = SYSTEM_IMAGE_RO;
break;
default:
copy = SYSTEM_IMAGE_UNKNOWN;
ret = !EC_SUCCESS;
}
if (ret == EC_SUCCESS) {
enable_mpu = 1;
CPRINTS("%s image locked",
system_image_copy_t_to_string(copy));
} else {
CPRINTS("Failed to lock %s image (%d)",
system_image_copy_t_to_string(copy), ret);
}
if (enable_mpu)
mpu_enable();
} else {
CPRINTS("System is unlocked. Skip MPU configuration");
}
#endif
}
int mpu_pre_init(void)
{
int i;
if (mpu_get_type() != 0x00000800)
return EC_ERROR_UNIMPLEMENTED;
mpu_disable();
for (i = 0; i < 8; ++i)
mpu_config_region(i, CONFIG_RAM_BASE, CONFIG_RAM_SIZE, 0, 0);
return EC_SUCCESS;
}
