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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2014 Google Inc
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; version 2 of
* the License.
*
* This program is distributed in the hope that 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include <arch/barrier.h>
#include <arch/io.h>
#include <arch/lib_helpers.h>
#include <arch/secmon.h>
#include <arch/transition.h>
#include <console/console.h>
#include <rmodule.h>
#include <stddef.h>
static void secmon_wait(void)
{
/*
* TODO(furquan): This should be a point of no-return. Once we have PSCI
* support we need to respond to kernel calls
*/
while (1)
wfe();
}
static void secmon_el3_init(void)
{
uint32_t scr;
scr = raw_read_scr_el3();
/* Enable SMC */
scr &= ~(SCR_SMC_MASK);
scr |= SCR_SMC_ENABLE;
raw_write_scr_el3(scr);
isb();
}
static void secmon_init(void *arg)
{
struct exc_state exc_state;
struct secmon_params *params = arg;
printk(BIOS_DEBUG, "ARM64: secmon in %s\n", __func__);
secmon_el3_init();
/*
* Check if the arg is non-NULL
* 1) If yes, we make an EL2 transition to that entry point
* 2) If no, we just wait
*/
if (params == NULL) {
secmon_wait();
}
memset(&exc_state, 0, sizeof(exc_state));
exc_state.elx.spsr = get_eret_el(params->elx_el, params->elx_mode);
transition_with_entry(params->entry, params->arg, &exc_state);
}
/*
* This variable holds entry point for secmon init code. Once the stacks are
* setup by the stage_entry.S, it jumps to c_entry.
*/
void (*c_entry)(void*) = &secmon_init;
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