path: root/src/arch/arm64/armv8/lib/pstate.c

/*
 * 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
 *
 * Reference: ARM Architecture Reference Manual, ARMv8-A edition
 * pstate.c: This file defines all the library functions for accessing
 * PSTATE and special purpose registers
 */

#include <stdint.h>

#include <arch/lib_helpers.h>

/* CurrentEL */
uint32_t raw_read_current_el(void)
{
	uint32_t current_el;

	__asm__ __volatile__("mrs %0, CurrentEL\n\t" : "=r" (current_el) :  : "memory");

	return current_el;
}

uint32_t get_current_el(void)
{
	uint32_t current_el = raw_read_current_el();
	return ((current_el >> CURRENT_EL_SHIFT) & CURRENT_EL_MASK);
}

/* DAIF */
uint32_t raw_read_daif(void)
{
	uint32_t daif;

	__asm__ __volatile__("mrs %0, DAIF\n\t" : "=r" (daif) :  : "memory");

	return daif;
}

void raw_write_daif(uint32_t daif)
{
	__asm__ __volatile__("msr DAIF, %0\n\t" : : "r" (daif) : "memory");
}

void enable_debug_exceptions(void)
{
	__asm__ __volatile__("msr DAIFClr, %0\n\t" : : "i" (DAIF_DBG_BIT)  : "memory");
}

void enable_serror_exceptions(void)
{
	__asm__ __volatile__("msr DAIFClr, %0\n\t" : : "i" (DAIF_ABT_BIT)  : "memory");
}

void enable_irq(void)
{
	__asm__ __volatile__("msr DAIFClr, %0\n\t" : : "i" (DAIF_IRQ_BIT)  : "memory");
}

void enable_fiq(void)
{
	__asm__ __volatile__("msr DAIFClr, %0\n\t" : : "i" (DAIF_FIQ_BIT)  : "memory");
}

void disable_debug_exceptions(void)
{
	__asm__ __volatile__("msr DAIFSet, %0\n\t" : : "i" (DAIF_DBG_BIT)  : "memory");
}

void disable_serror_exceptions(void)
{
	__asm__ __volatile__("msr DAIFSet, %0\n\t" : : "i" (DAIF_ABT_BIT)  : "memory");
}

void disable_irq(void)
{
	__asm__ __volatile__("msr DAIFSet, %0\n\t" : : "i" (DAIF_IRQ_BIT)  : "memory");
}

void disable_fiq(void)
{
	__asm__ __volatile__("msr DAIFSet, %0\n\t" : : "i" (DAIF_FIQ_BIT)  : "memory");
}

/* DLR_EL0 */
uint64_t raw_read_dlr_el0(void)
{
	uint64_t dlr_el0;

	__asm__ __volatile__("mrs %0, DLR_EL0\n\t" : "=r" (dlr_el0) :  : "memory");

	return dlr_el0;
}
void raw_write_dlr_el0(uint64_t dlr_el0)
{
	__asm__ __volatile__("msr DLR_EL0, %0\n\t" : : "r" (dlr_el0) : "memory");
}

/* DSPSR_EL0 */
uint64_t raw_read_dspsr_el0(void)
{
	uint64_t dspsr_el0;

	__asm__ __volatile__("mrs %0, DSPSR_EL0\n\t" : "=r" (dspsr_el0) :  : "memory");

	return dspsr_el0;
}
void raw_write_dspsr_el0(uint64_t dspsr_el0)
{
	__asm__ __volatile__("msr DSPSR_EL0, %0\n\t" : : "r" (dspsr_el0) : "memory");
}

/* ELR */
uint64_t raw_read_elr_el1(void)
{
	uint64_t elr_el1;

	__asm__ __volatile__("mrs %0, ELR_EL1\n\t" : "=r" (elr_el1) :  : "memory");

	return elr_el1;
}

void raw_write_elr_el1(uint64_t elr_el1)
{
	__asm__ __volatile__("msr ELR_EL1, %0\n\t" : : "r" (elr_el1) : "memory");
}

uint64_t raw_read_elr_el2(void)
{
	uint64_t elr_el2;

	__asm__ __volatile__("mrs %0, ELR_EL2\n\t" : "=r" (elr_el2) :  : "memory");

	return elr_el2;
}

void raw_write_elr_el2(uint64_t elr_el2)
{
	__asm__ __volatile__("msr ELR_EL2, %0\n\t" : : "r" (elr_el2) : "memory");
}

uint64_t raw_read_elr_el3(void)
{
	uint64_t elr_el3;

	__asm__ __volatile__("mrs %0, ELR_EL3\n\t" : "=r" (elr_el3) :  : "memory");

	return elr_el3;
}

void raw_write_elr_el3(uint64_t elr_el3)
{
	__asm__ __volatile__("msr ELR_EL3, %0\n\t" : : "r" (elr_el3) : "memory");
}

uint64_t raw_read_elr_current(void)
{
	SWITCH_CASE_READ(raw_read_elr,elr,uint64_t);
}

void raw_write_elr_current(uint64_t elr)
{
	SWITCH_CASE_WRITE(raw_write_elr,elr);
}

/* FPCR */
uint32_t raw_read_fpcr(void)
{
	uint32_t fpcr;

	__asm__ __volatile__("mrs %0, FPCR\n\t" : "=r" (fpcr) :  : "memory");

	return fpcr;
}

void raw_write_fpcr(uint32_t fpcr)
{
	__asm__ __volatile__("msr FPCR, %0\n\t" : : "r" (fpcr) : "memory");
}

/* FPSR */
uint32_t raw_read_fpsr(void)
{
	uint32_t fpsr;

	__asm__ __volatile__("mrs %0, FPSR\n\t" : "=r" (fpsr) :  : "memory");

	return fpsr;
}

void raw_write_fpsr(uint32_t fpsr)
{
	__asm__ __volatile__("msr FPSR, %0\n\t" : : "r" (fpsr) : "memory");
}

/* NZCV */
uint32_t raw_read_nzcv(void)
{
	uint32_t nzcv;

	__asm__ __volatile__("mrs %0, NZCV\n\t" : "=r" (nzcv) :  : "memory");

	return nzcv;
}

void raw_write_nzcv(uint32_t nzcv)
{
	__asm__ __volatile__("msr NZCV, %0\n\t" : : "r" (nzcv) : "memory");
}

/* SP */
uint64_t raw_read_sp_el0(void)
{
	uint64_t sp_el0;

	__asm__ __volatile__("mrs %0, SP_EL0\n\t" : "=r" (sp_el0) :  : "memory");

	return sp_el0;
}

void raw_write_sp_el0(uint64_t sp_el0)
{
	__asm__ __volatile__("msr SP_EL0, %0\n\t" : : "r" (sp_el0) : "memory");
}

uint64_t raw_read_sp_el1(void)
{
	uint64_t sp_el1;

	__asm__ __volatile__("mrs %0, SP_EL1\n\t" : "=r" (sp_el1) :  : "memory");

	return sp_el1;
}

void raw_write_sp_el1(uint64_t sp_el1)
{
	__asm__ __volatile__("msr SP_EL1, %0\n\t" : : "r" (sp_el1) : "memory");
}

uint64_t raw_read_sp_el2(void)
{
	uint64_t sp_el2;

	__asm__ __volatile__("mrs %0, SP_EL2\n\t" : "=r" (sp_el2) :  : "memory");

	return sp_el2;
}

void raw_write_sp_el2(uint64_t sp_el2)
{
	__asm__ __volatile__("msr SP_EL2, %0\n\t" : : "r" (sp_el2) : "memory");
}

/* SPSel */
uint32_t raw_read_spsel(void)
{
	uint32_t spsel;

	__asm__ __volatile__("mrs %0, SPSel\n\t" : "=r" (spsel) :  : "memory");

	return spsel;
}

void raw_write_spsel(uint32_t spsel)
{
	__asm__ __volatile__("msr SPSel, %0\n\t" : : "r" (spsel) : "memory");
}

uint64_t raw_read_sp_el3(void)
{
	uint64_t sp_el3;
	uint32_t spsel;

	spsel = raw_read_spsel();
	if (!spsel)
		raw_write_spsel(1);

	__asm__ __volatile__("mov %0, sp\n\t" : "=r" (sp_el3) :  : "memory");

	if (!spsel)
		raw_write_spsel(spsel);

	return sp_el3;
}

void raw_write_sp_el3(uint64_t sp_el3)
{
	uint32_t spsel;

	spsel = raw_read_spsel();
	if (!spsel)
		raw_write_spsel(1);

	__asm__ __volatile__("mov sp, %0\n\t" : "=r" (sp_el3) :  : "memory");

	if (!spsel)
		raw_write_spsel(spsel);
}

/* SPSR */
uint32_t raw_read_spsr_abt(void)
{
	uint32_t spsr_abt;

	__asm__ __volatile__("mrs %0, SPSR_abt\n\t" : "=r" (spsr_abt) :  : "memory");

	return spsr_abt;
}

void raw_write_spsr_abt(uint32_t spsr_abt)
{
	__asm__ __volatile__("msr SPSR_abt, %0\n\t" : : "r" (spsr_abt) : "memory");
}

uint32_t raw_read_spsr_el1(void)
{
	uint32_t spsr_el1;

	__asm__ __volatile__("mrs %0, SPSR_EL1\n\t" : "=r" (spsr_el1) :  : "memory");

	return spsr_el1;
}

void raw_write_spsr_el1(uint32_t spsr_el1)
{
	__asm__ __volatile__("msr SPSR_EL1, %0\n\t" : : "r" (spsr_el1) : "memory");
}

uint32_t raw_read_spsr_el2(void)
{
	uint32_t spsr_el2;

	__asm__ __volatile__("mrs %0, SPSR_EL2\n\t" : "=r" (spsr_el2) :  : "memory");

	return spsr_el2;
}

void raw_write_spsr_el2(uint32_t spsr_el2)
{
	__asm__ __volatile__("msr SPSR_EL2, %0\n\t" : : "r" (spsr_el2) : "memory");
}

uint32_t raw_read_spsr_el3(void)
{
	uint32_t spsr_el3;

	__asm__ __volatile__("mrs %0, SPSR_EL3\n\t" : "=r" (spsr_el3) :  : "memory");

	return spsr_el3;
}

void raw_write_spsr_el3(uint32_t spsr_el3)
{
	__asm__ __volatile__("msr SPSR_EL3, %0\n\t" : : "r" (spsr_el3) : "memory");
}

uint32_t raw_read_spsr_current(void)
{
	SWITCH_CASE_READ(raw_read_spsr,spsr,uint32_t);
}

void raw_write_spsr_current(uint32_t spsr)
{
	SWITCH_CASE_WRITE(raw_write_spsr,spsr);
}

uint32_t raw_read_spsr_fiq(void)
{
	uint32_t spsr_fiq;

	__asm__ __volatile__("mrs %0, SPSR_fiq\n\t" : "=r" (spsr_fiq) :  : "memory");

	return spsr_fiq;
}

void raw_write_spsr_fiq(uint32_t spsr_fiq)
{
	__asm__ __volatile__("msr SPSR_fiq, %0\n\t" : : "r" (spsr_fiq) : "memory");
}

uint32_t raw_read_spsr_irq(void)
{
	uint32_t spsr_irq;

	__asm__ __volatile__("mrs %0, SPSR_irq\n\t" : "=r" (spsr_irq) :  : "memory");

	return spsr_irq;
}

void raw_write_spsr_irq(uint32_t spsr_irq)
{
	__asm__ __volatile__("msr SPSR_irq, %0\n\t" : : "r" (spsr_irq) : "memory");
}

uint32_t raw_read_spsr_und(void)
{
	uint32_t spsr_und;

	__asm__ __volatile__("mrs %0, SPSR_und\n\t" : "=r" (spsr_und) :  : "memory");

	return spsr_und;
}

void raw_write_spsr_und(uint32_t spsr_und)
{
	__asm__ __volatile__("msr SPSR_und, %0\n\t" : : "r" (spsr_und) : "memory");
}