/*******************************************************************************
* This function programs EL3 registers and performs other setup to enable entry
* into the next image after BL31 at the next ERET.
******************************************************************************/
void bl31_prepare_next_image_entry()
{
el_change_info_t *next_image_info;
uint32_t scr, image_type;
/* Determine which image to execute next */
image_type = bl31_get_next_image_type();
/*
* Setup minimal architectural state of the next highest EL to
* allow execution in it immediately upon entering it.
*/
bl31_next_el_arch_setup(image_type);
/* Program EL3 registers to enable entry into the next EL */
next_image_info = bl31_get_next_image_info(image_type);
assert(next_image_info);
scr = read_scr();
if (image_type == NON_SECURE)
scr |= SCR_NS_BIT;
/*
* Tell the context mgmt. library to ensure that SP_EL3 points to
* the right context to exit from EL3 correctly.
*/
cm_set_el3_eret_context(next_image_info->security_state,
next_image_info->entrypoint,
next_image_info->spsr,
scr);
/* Finally set the next context */
cm_set_next_eret_context(next_image_info->security_state);
}
/*******************************************************************************
* BL31 is responsible for setting up the runtime services for the primary cpu
* before passing control to the bootloader (UEFI) or Linux. This function calls
* runtime_svc_init() which initializes all registered runtime services. The run
* time services would setup enough context for the core to swtich to the next
* exception level. When this function returns, the core will switch to the
* programmed exception level via. an ERET.
******************************************************************************/
void bl31_main(void)
{
el_change_info *next_image_info;
uint32_t scr;
/* Perform remaining generic architectural setup from EL3 */
bl31_arch_setup();
/* Perform platform setup in BL1 */
bl31_platform_setup();
#if defined (__GNUC__)
printf("BL31 Built : %s, %s\n\r", __TIME__, __DATE__);
#endif
/* Initialise helper libraries */
bl31_lib_init();
/* Initialize the runtime services e.g. psci */
runtime_svc_init();
/* Clean caches before re-entering normal world */
dcsw_op_all(DCCSW);
/*
* Setup minimal architectural state of the next highest EL to
* allow execution in it immediately upon entering it.
*/
bl31_arch_next_el_setup();
/* Program EL3 registers to enable entry into the next EL */
next_image_info = bl31_get_next_image_info();
scr = read_scr();
if (next_image_info->security_state == NON_SECURE)
scr |= SCR_NS_BIT;
/*
* Tell the context mgmt. library to ensure that SP_EL3 points to
* the right context to exit from EL3 correctly.
*/
cm_set_el3_eret_context(next_image_info->security_state,
next_image_info->entrypoint,
next_image_info->spsr,
scr);
/* Finally set the next context */
cm_set_next_eret_context(next_image_info->security_state);
}