arch_helpers.h

/*
 * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of ARM nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef __ARCH_HELPERS_H__
#define __ARCH_HELPERS_H__

#include <arch.h>	/* for additional register definitions */
#include <cdefs.h>	/* For __dead2 */
#include <stdint.h>

/**********************************************************************
 * Macros which create inline functions to read or write CPU system
 * registers
 *********************************************************************/

#define _DEFINE_SYSREG_READ_FUNC(_name, _reg_name)		\
static inline uint64_t read_ ## _name(void)			\
{								\
	uint64_t v;						\
	__asm__ volatile ("mrs %0, " #_reg_name : "=r" (v));	\
	return v;						\
}

#define _DEFINE_SYSREG_WRITE_FUNC(_name, _reg_name)			\
static inline void write_ ## _name(uint64_t v)				\
{									\
	__asm__ volatile ("msr " #_reg_name ", %0" : : "r" (v));	\
}

#define _DEFINE_SYSREG_WRITE_CONST_FUNC(_name, _reg_name)		\
static inline void write_ ## _name(const uint64_t v)			\
{									\
	__asm__ volatile ("msr " #_reg_name ", %0" : : "i" (v));	\
}

/* Define read function for system register */
#define DEFINE_SYSREG_READ_FUNC(_name) 			\
	_DEFINE_SYSREG_READ_FUNC(_name, _name)

/* Define read & write function for system register */
#define DEFINE_SYSREG_RW_FUNCS(_name)			\
	_DEFINE_SYSREG_READ_FUNC(_name, _name)		\
	_DEFINE_SYSREG_WRITE_FUNC(_name, _name)

/* Define read & write function for renamed system register */
#define DEFINE_RENAME_SYSREG_RW_FUNCS(_name, _reg_name)	\
	_DEFINE_SYSREG_READ_FUNC(_name, _reg_name)	\
	_DEFINE_SYSREG_WRITE_FUNC(_name, _reg_name)

/* Define write function for special system registers */
#define DEFINE_SYSREG_WRITE_CONST_FUNC(_name)		\
	_DEFINE_SYSREG_WRITE_CONST_FUNC(_name, _name)


/**********************************************************************
 * Macros to create inline functions for system instructions
 *********************************************************************/

/* Define function for simple system instruction */
#define DEFINE_SYSOP_FUNC(_op)				\
static inline void _op(void)				\
{							\
	__asm__ (#_op);					\
}

/* Define function for system instruction with type specifier */
#define DEFINE_SYSOP_TYPE_FUNC(_op, _type)		\
static inline void _op ## _type(void)			\
{							\
	__asm__ (#_op " " #_type);			\
}

/* Define function for system instruction with register parameter */
#define DEFINE_SYSOP_TYPE_PARAM_FUNC(_op, _type)	\
static inline void _op ## _type(uint64_t v)		\
{							\
	 __asm__ (#_op " " #_type ", %0" : : "r" (v));	\
}

/*******************************************************************************
 * Aarch64 translation tables manipulation helper prototypes
******************************************************************************/
uint64_t create_table_desc(uint64_t *next_table_ptr);
uint64_t create_block_desc(uint64_t desc, uint64_t addr, uint32_t level);
uint64_t create_device_block(uint64_t output_addr, uint32_t level, uint32_t ns);
uint64_t create_romem_block(uint64_t output_addr, uint32_t level, uint32_t ns);
uint64_t create_rwmem_block(uint64_t output_addr, uint32_t level, uint32_t ns);

/*******************************************************************************
 * TLB maintenance accessor prototypes
 ******************************************************************************/
DEFINE_SYSOP_TYPE_FUNC(tlbi, alle1)
DEFINE_SYSOP_TYPE_FUNC(tlbi, alle1is)
DEFINE_SYSOP_TYPE_FUNC(tlbi, alle2)
DEFINE_SYSOP_TYPE_FUNC(tlbi, alle2is)
DEFINE_SYSOP_TYPE_FUNC(tlbi, alle3)
DEFINE_SYSOP_TYPE_FUNC(tlbi, alle3is)
DEFINE_SYSOP_TYPE_FUNC(tlbi, vmalle1)

/*******************************************************************************
 * Cache maintenance accessor prototypes
 ******************************************************************************/
DEFINE_SYSOP_TYPE_PARAM_FUNC(dc, isw)
DEFINE_SYSOP_TYPE_PARAM_FUNC(dc, cisw)
DEFINE_SYSOP_TYPE_PARAM_FUNC(dc, csw)
DEFINE_SYSOP_TYPE_PARAM_FUNC(dc, cvac)
DEFINE_SYSOP_TYPE_PARAM_FUNC(dc, ivac)
DEFINE_SYSOP_TYPE_PARAM_FUNC(dc, civac)
DEFINE_SYSOP_TYPE_PARAM_FUNC(dc, cvau)
DEFINE_SYSOP_TYPE_PARAM_FUNC(dc, zva)

void flush_dcache_range(uint64_t, uint64_t);
void inv_dcache_range(uint64_t, uint64_t);
void dcsw_op_louis(uint32_t);
void dcsw_op_all(uint32_t);

void disable_mmu_el3(void);
void disable_mmu_icache_el3(void);

/*******************************************************************************
 * Misc. accessor prototypes
 ******************************************************************************/

DEFINE_SYSREG_WRITE_CONST_FUNC(daifset)
DEFINE_SYSREG_WRITE_CONST_FUNC(daifclr)

#define enable_irq()			write_daifclr(DAIF_IRQ_BIT)
#define enable_fiq()			write_daifclr(DAIF_FIQ_BIT)
#define enable_serror()			write_daifclr(DAIF_ABT_BIT)
#define enable_debug_exceptions()	write_daifclr(DAIF_DBG_BIT)
#define disable_irq()			write_daifset(DAIF_IRQ_BIT)
#define disable_fiq()			write_daifset(DAIF_FIQ_BIT)
#define disable_serror()		write_daifset(DAIF_ABT_BIT)
#define disable_debug_exceptions()	write_daifset(DAIF_DBG_BIT)

DEFINE_SYSREG_READ_FUNC(id_pfr1_el1)
DEFINE_SYSREG_READ_FUNC(id_aa64pfr0_el1)
DEFINE_SYSREG_READ_FUNC(CurrentEl)
DEFINE_SYSREG_RW_FUNCS(daif)
DEFINE_SYSREG_RW_FUNCS(spsr_el1)
DEFINE_SYSREG_RW_FUNCS(spsr_el2)
DEFINE_SYSREG_RW_FUNCS(spsr_el3)
DEFINE_SYSREG_RW_FUNCS(elr_el1)
DEFINE_SYSREG_RW_FUNCS(elr_el2)
DEFINE_SYSREG_RW_FUNCS(elr_el3)

DEFINE_SYSOP_FUNC(wfi)
DEFINE_SYSOP_FUNC(wfe)
DEFINE_SYSOP_FUNC(sev)
DEFINE_SYSOP_TYPE_FUNC(dsb, sy)
DEFINE_SYSOP_TYPE_FUNC(dmb, sy)
DEFINE_SYSOP_TYPE_FUNC(dsb, ish)
DEFINE_SYSOP_TYPE_FUNC(dmb, ish)
DEFINE_SYSOP_FUNC(isb)

uint32_t get_afflvl_shift(uint32_t);
uint32_t mpidr_mask_lower_afflvls(uint64_t, uint32_t);


void __dead2 eret(uint64_t x0, uint64_t x1, uint64_t x2, uint64_t x3,
		  uint64_t x4, uint64_t x5, uint64_t x6, uint64_t x7);
void __dead2 smc(uint64_t x0, uint64_t x1, uint64_t x2, uint64_t x3,
		 uint64_t x4, uint64_t x5, uint64_t x6, uint64_t x7);

/*******************************************************************************
 * System register accessor prototypes
 ******************************************************************************/
DEFINE_SYSREG_READ_FUNC(midr_el1)
DEFINE_SYSREG_READ_FUNC(mpidr_el1)

DEFINE_SYSREG_RW_FUNCS(scr_el3)
DEFINE_SYSREG_RW_FUNCS(hcr_el2)

DEFINE_SYSREG_RW_FUNCS(vbar_el1)
DEFINE_SYSREG_RW_FUNCS(vbar_el2)
DEFINE_SYSREG_RW_FUNCS(vbar_el3)

DEFINE_SYSREG_RW_FUNCS(sctlr_el1)
DEFINE_SYSREG_RW_FUNCS(sctlr_el2)
DEFINE_SYSREG_RW_FUNCS(sctlr_el3)

DEFINE_SYSREG_RW_FUNCS(actlr_el1)
DEFINE_SYSREG_RW_FUNCS(actlr_el2)
DEFINE_SYSREG_RW_FUNCS(actlr_el3)

DEFINE_SYSREG_RW_FUNCS(esr_el1)
DEFINE_SYSREG_RW_FUNCS(esr_el2)
DEFINE_SYSREG_RW_FUNCS(esr_el3)

DEFINE_SYSREG_RW_FUNCS(afsr0_el1)
DEFINE_SYSREG_RW_FUNCS(afsr0_el2)
DEFINE_SYSREG_RW_FUNCS(afsr0_el3)

DEFINE_SYSREG_RW_FUNCS(afsr1_el1)
DEFINE_SYSREG_RW_FUNCS(afsr1_el2)
DEFINE_SYSREG_RW_FUNCS(afsr1_el3)

DEFINE_SYSREG_RW_FUNCS(far_el1)
DEFINE_SYSREG_RW_FUNCS(far_el2)
DEFINE_SYSREG_RW_FUNCS(far_el3)

DEFINE_SYSREG_RW_FUNCS(mair_el1)
DEFINE_SYSREG_RW_FUNCS(mair_el2)
DEFINE_SYSREG_RW_FUNCS(mair_el3)

DEFINE_SYSREG_RW_FUNCS(amair_el1)
DEFINE_SYSREG_RW_FUNCS(amair_el2)
DEFINE_SYSREG_RW_FUNCS(amair_el3)

DEFINE_SYSREG_READ_FUNC(rvbar_el1)
DEFINE_SYSREG_READ_FUNC(rvbar_el2)
DEFINE_SYSREG_READ_FUNC(rvbar_el3)

DEFINE_SYSREG_RW_FUNCS(rmr_el1)
DEFINE_SYSREG_RW_FUNCS(rmr_el2)
DEFINE_SYSREG_RW_FUNCS(rmr_el3)

DEFINE_SYSREG_RW_FUNCS(tcr_el1)
DEFINE_SYSREG_RW_FUNCS(tcr_el2)
DEFINE_SYSREG_RW_FUNCS(tcr_el3)

DEFINE_SYSREG_RW_FUNCS(ttbr0_el1)
DEFINE_SYSREG_RW_FUNCS(ttbr0_el2)
DEFINE_SYSREG_RW_FUNCS(ttbr0_el3)

DEFINE_SYSREG_RW_FUNCS(ttbr1_el1)

DEFINE_SYSREG_RW_FUNCS(cptr_el2)
DEFINE_SYSREG_RW_FUNCS(cptr_el3)

DEFINE_SYSREG_RW_FUNCS(cpacr_el1)
DEFINE_SYSREG_RW_FUNCS(cntfrq_el0)
DEFINE_SYSREG_RW_FUNCS(cntps_ctl_el1)
DEFINE_SYSREG_RW_FUNCS(cntps_tval_el1)
DEFINE_SYSREG_RW_FUNCS(cntps_cval_el1)
DEFINE_SYSREG_READ_FUNC(cntpct_el0)
DEFINE_SYSREG_RW_FUNCS(cnthctl_el2)

DEFINE_SYSREG_RW_FUNCS(tpidr_el3)

DEFINE_SYSREG_RW_FUNCS(cntvoff_el2)

DEFINE_SYSREG_RW_FUNCS(vpidr_el2)
DEFINE_SYSREG_RW_FUNCS(vmpidr_el2)

DEFINE_SYSREG_READ_FUNC(isr_el1)

/* GICv3 System Registers */

DEFINE_RENAME_SYSREG_RW_FUNCS(icc_sre_el1, ICC_SRE_EL1)
DEFINE_RENAME_SYSREG_RW_FUNCS(icc_sre_el2, ICC_SRE_EL2)
DEFINE_RENAME_SYSREG_RW_FUNCS(icc_sre_el3, ICC_SRE_EL3)
DEFINE_RENAME_SYSREG_RW_FUNCS(icc_pmr_el1, ICC_PMR_EL1)


#define IS_IN_EL(x) \
	(GET_EL(read_CurrentEl()) == MODE_EL##x)

#define IS_IN_EL1() IS_IN_EL(1)
#define IS_IN_EL3() IS_IN_EL(3)

/* Previously defined accesor functions with incomplete register names  */

#define read_current_el()	read_CurrentEl()

#define dsb()			dsbsy()

#define read_midr()		read_midr_el1()

#define read_mpidr()		read_mpidr_el1()

#define read_scr()		read_scr_el3()
#define write_scr(_v)		write_scr_el3(_v)

#define read_hcr()		read_hcr_el2()
#define write_hcr(_v)		write_hcr_el2(_v)

#define read_cpacr()		read_cpacr_el1()
#define write_cpacr(_v)		write_cpacr_el1(_v)

#endif /* __ARCH_HELPERS_H__ */