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Atmosphere/thermosphere/src/traps.c

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/*
* Copyright (c) 2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.
*/
#include "traps.h"
#include "sysreg.h"
static inline void enableDebugTraps(void)
{
u64 mdcr = GET_SYSREG(mdcr_el2);
// Trap Debug Exceptions, and accesses to debug registers.
mdcr |= MDCR_EL2_TDE;
// Implied from TDE
mdcr |= MDCR_EL2_TDRA | MDCR_EL2_TDOSA | MDCR_EL2_TDA;
SET_SYSREG(mdcr_el2, mdcr);
}
static inline void enableTimerTraps(void)
{
// Disable event streams, trap everything
u64 cnthctl = 0;
SET_SYSREG(cnthctl_el2, cnthctl);
}
void enableTraps(void)
{
u64 hcr = GET_SYSREG(hcr_el2);
// Trap SMC instructions
hcr |= HCR_TSC;
// Trap set/way isns
hcr |= HCR_TSW;
// Reroute physical IRQs to EL2
hcr |= HCR_IMO;
// Make sure HVC is enabled
hcr &= ~HCR_HCD;
SET_SYSREG(hcr_el2, hcr);
enableDebugTraps();
enableTimerTraps();
}