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/*
* xen/arch/arm/tee/tee.c
*
* Generic part of TEE mediator subsystem
*
* Volodymyr Babchuk <volodymyr_babchuk@epam.com>
* Copyright (c) 2018-2019 EPAM Systems.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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.
*/
#include <xen/errno.h>
#include <xen/init.h>
#include <xen/types.h>
#include <asm/tee/tee.h>
extern const struct tee_mediator_desc _steemediator[], _eteemediator[];
static const struct tee_mediator_desc __read_mostly *cur_mediator;
/*
* TODO: Add function to alter Dom0 DTB, so we can properly describe
* present TEE.
*/
bool tee_handle_call(struct cpu_user_regs *regs)
{
if ( unlikely(!cur_mediator) )
return false;
return cur_mediator->ops->handle_call(regs);
}
int tee_domain_init(struct domain *d, uint16_t tee_type)
{
if ( tee_type == XEN_DOMCTL_CONFIG_TEE_NONE )
return 0;
if ( !cur_mediator )
return -ENODEV;
if ( cur_mediator->tee_type != tee_type )
return -EINVAL;
return cur_mediator->ops->domain_init(d);
}
int tee_relinquish_resources(struct domain *d)
{
if ( !cur_mediator )
return 0;
return cur_mediator->ops->relinquish_resources(d);
}
uint16_t tee_get_type(void)
{
if ( !cur_mediator )
return XEN_DOMCTL_CONFIG_TEE_NONE;
return cur_mediator->tee_type;
}
static int __init tee_init(void)
{
const struct tee_mediator_desc *desc;
for ( desc = _steemediator; desc != _eteemediator; desc++ )
{
if ( desc->ops->probe() )
{
printk(XENLOG_INFO "Using TEE mediator for %s\n", desc->name);
cur_mediator = desc;
return 0;
}
}
return 0;
}
__initcall(tee_init);
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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