lib_helpers.h

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/*
 * Copyright (c) 2021 Carlo Caione <ccaione@baylibre.com>
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_ARCH_ARM64_LIB_HELPERS_H_
#define ZEPHYR_INCLUDE_ARCH_ARM64_LIB_HELPERS_H_
 
#ifndef _ASMLANGUAGE
 
#include <zephyr/arch/arm64/cpu.h>
#include <stdint.h>
 
/* All the macros need a memory clobber */
 
#define read_sysreg(reg)                                                \
({                                                                      \
        uint64_t reg_val;                                               \
        __asm__ volatile ("mrs %0, " STRINGIFY(reg)                     \
                          : "=r" (reg_val) :: "memory");                \
        reg_val;                                                        \
})
 
#define write_sysreg(val, reg)                                          \
({                                                                      \
        __asm__ volatile ("msr " STRINGIFY(reg) ", %0"                  \
                          :: "r" (val) : "memory");                     \
})
 
#define zero_sysreg(reg)                                                \
({                                                                      \
        __asm__ volatile ("msr " STRINGIFY(reg) ", xzr"                 \
                          ::: "memory");                                \
})
 
#define MAKE_REG_HELPER(reg)                                            \
        static ALWAYS_INLINE uint64_t read_##reg(void)                  \
        {                                                               \
                return read_sysreg(reg);                                \
        }                                                               \
        static ALWAYS_INLINE void write_##reg(uint64_t val)             \
        {                                                               \
                write_sysreg(val, reg);                                 \
        }                                                               \
        static ALWAYS_INLINE void zero_##reg(void)                      \
        {                                                               \
                zero_sysreg(reg);                                       \
        }
 
#define MAKE_REG_HELPER_EL123(reg) \
        MAKE_REG_HELPER(reg##_el1) \
        MAKE_REG_HELPER(reg##_el2) \
        MAKE_REG_HELPER(reg##_el3)
 
MAKE_REG_HELPER(ccsidr_el1);
MAKE_REG_HELPER(clidr_el1);
MAKE_REG_HELPER(cntfrq_el0);
MAKE_REG_HELPER(cnthctl_el2);
MAKE_REG_HELPER(cnthp_ctl_el2);
MAKE_REG_HELPER(cnthps_ctl_el2);
MAKE_REG_HELPER(cntv_ctl_el0)
MAKE_REG_HELPER(cntv_cval_el0)
MAKE_REG_HELPER(cntvct_el0);
MAKE_REG_HELPER(cntvoff_el2);
MAKE_REG_HELPER(currentel);
MAKE_REG_HELPER(csselr_el1);
MAKE_REG_HELPER(daif)
MAKE_REG_HELPER(hcr_el2);
MAKE_REG_HELPER(id_aa64pfr0_el1);
MAKE_REG_HELPER(id_aa64mmfr0_el1);
MAKE_REG_HELPER(mpidr_el1);
MAKE_REG_HELPER(par_el1);
#if !defined(CONFIG_ARMV8_R)
MAKE_REG_HELPER(scr_el3);
#endif /* CONFIG_ARMV8_R */
MAKE_REG_HELPER(tpidrro_el0);
MAKE_REG_HELPER(vmpidr_el2);
MAKE_REG_HELPER(sp_el0);
 
MAKE_REG_HELPER_EL123(actlr)
MAKE_REG_HELPER_EL123(cpacr)
MAKE_REG_HELPER_EL123(cptr)
MAKE_REG_HELPER_EL123(elr)
MAKE_REG_HELPER_EL123(esr)
MAKE_REG_HELPER_EL123(far)
MAKE_REG_HELPER_EL123(mair)
MAKE_REG_HELPER_EL123(sctlr)
MAKE_REG_HELPER_EL123(spsr)
MAKE_REG_HELPER_EL123(tcr)
MAKE_REG_HELPER_EL123(ttbr0)
MAKE_REG_HELPER_EL123(vbar)
 
#if defined(CONFIG_ARM_MPU)
/* Armv8-R aarch64 mpu registers */
#define mpuir_el1       S3_0_c0_c0_4
#define prselr_el1      S3_0_c6_c2_1
#define prbar_el1       S3_0_c6_c8_0
#define prlar_el1       S3_0_c6_c8_1
 
MAKE_REG_HELPER(mpuir_el1);
MAKE_REG_HELPER(prselr_el1);
MAKE_REG_HELPER(prbar_el1);
MAKE_REG_HELPER(prlar_el1);
#endif
 
static ALWAYS_INLINE void enable_debug_exceptions(void)
{
        __asm__ volatile ("msr DAIFClr, %0"
                          :: "i" (DAIFCLR_DBG_BIT) : "memory");
}
 
static ALWAYS_INLINE void disable_debug_exceptions(void)
{
        __asm__ volatile ("msr DAIFSet, %0"
                          :: "i" (DAIFSET_DBG_BIT) : "memory");
}
 
static ALWAYS_INLINE void enable_serror_exceptions(void)
{
        __asm__ volatile ("msr DAIFClr, %0"
                          :: "i" (DAIFCLR_ABT_BIT) : "memory");
}
 
static ALWAYS_INLINE void disable_serror_exceptions(void)
{
        __asm__ volatile ("msr DAIFSet, %0"
                          :: "i" (DAIFSET_ABT_BIT) : "memory");
}
 
static ALWAYS_INLINE void enable_irq(void)
{
        __asm__ volatile ("msr DAIFClr, %0"
                          :: "i" (DAIFCLR_IRQ_BIT) : "memory");
}
 
static ALWAYS_INLINE void disable_irq(void)
{
        __asm__ volatile ("msr DAIFSet, %0"
                          :: "i" (DAIFSET_IRQ_BIT) : "memory");
}
 
static ALWAYS_INLINE void enable_fiq(void)
{
        __asm__ volatile ("msr DAIFClr, %0"
                          :: "i" (DAIFCLR_FIQ_BIT) : "memory");
}
 
static ALWAYS_INLINE void disable_fiq(void)
{
        __asm__ volatile ("msr DAIFSet, %0"
                          :: "i" (DAIFSET_FIQ_BIT) : "memory");
}
 
#define sev()   __asm__ volatile("sev" : : : "memory")
#define wfe()   __asm__ volatile("wfe" : : : "memory")
#define wfi()   __asm__ volatile("wfi" : : : "memory")
 
static inline bool is_el_implemented(unsigned int el)
{
        unsigned int shift;
 
        if (el > 3) {
                return false;
        }
 
        shift = ID_AA64PFR0_EL1_SHIFT * el;
 
        return (((read_id_aa64pfr0_el1() >> shift) & ID_AA64PFR0_ELX_MASK) != 0U);
}
 
static inline bool is_el_highest_implemented(void)
{
        uint32_t el_highest;
        uint32_t curr_el;
 
        el_highest = read_id_aa64pfr0_el1() & 0xFFFF;
        el_highest = (31U - __builtin_clz(el_highest)) / 4;
 
        curr_el = GET_EL(read_currentel());
 
        if (curr_el < el_highest)
                return false;
 
        return true;
}
 
static inline bool is_el2_sec_supported(void)
{
        return (((read_id_aa64pfr0_el1() >> ID_AA64PFR0_SEL2_SHIFT) &
                ID_AA64PFR0_SEL2_MASK) != 0U);
}
 
static inline bool is_in_secure_state(void)
{
        /* We cannot read SCR_EL3 from EL2 or EL1 */
        return !IS_ENABLED(CONFIG_ARMV8_A_NS);
}
 
#endif /* !_ASMLANGUAGE */
 
#endif /* ZEPHYR_INCLUDE_ARCH_ARM64_LIB_HELPERS_H_ */